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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Sleep apnea&#8211;hypopnea syndrome &#40;SAHS&#41; is a public health problem of the first order&#44;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> due to its high prevalence<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#44;3</span></a> and marked morbidity and mortality&#44;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#8211;6</span></a> having been linked to traffic accidents&#44;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8</span></a> cardiovascular complications<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#8211;25</span></a> and&#44; more recently&#44; neoplastic diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> One increasingly interesting aspect is its relationship with metabolic disorders&#44; specifically type 2 diabetes &#40;DM2&#41;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Diabetes mellitus is a global epidemic&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">27</span></a> There are currently 382 million diabetics worldwide&#44; a figure which is estimated to reach 592 million in 2035&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> DM2&#44; which accounts for 90&#37;&#8211;95&#37; of all diabetes cases&#44;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> is a complex metabolic disorder in which the interaction of genetic and environmental factors causes a deficiency in both insulin secretion and insulin sensitivity&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">In healthy subjects&#44; glucose homeostasis is reached by controlling glucose production by the liver &#40;gluconeogenesis&#41; and its use by insulin-dependent tissues&#44; such as muscle and fat&#44; and by non-insulin-dependent tissues&#44; such as the brain&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a> Glucose uptake by peripheral tissues is regulated by insulin&#44; which is produced by pancreatic islet &#946;-cells&#44; both constitutionally and in response to an increase in blood glucose&#46; Insulin also suppresses hepatic gluconeogenesis and adipose tissue lipolysis&#46; The biological response of insulin target tissues &#40;insulin sensitivity&#41; has several physiological determinants&#44; particularly the amount of fatty tissue&#46; A decrease in the peripheral response to insulin &#40;insulin resistance&#41; reduces tissue glucose uptake and leads to glucose intolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> Failure by &#946;-cells to secrete sufficient insulin to overcome insulin resistance results in DM2&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The presence of common risk factors&#44; as well as the involvement of some shared pathogenic pathways&#44; explains the potential relationship between both entities&#46; Therefore&#44; the aims of this review were to analyze clinical&#8211;epidemiological data that support the existence of a possible relationship between SAHS and DM2&#44; to evaluate the pathogenic mechanisms potentially involved&#44; and to assess the prognostic impact of this relationship&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Clinical and Epidemiological Evidence</span><p id="par0025" class="elsevierStylePara elsevierViewall">Available evidence suggests that SAHS may alter glucose metabolism&#44; progressing from an increase in glucose resistance to glucose intolerance&#44; poorer metabolic control of blood glucose and&#44; ultimately&#44; DM2&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Despite the controversial findings in 1 preliminary study&#44;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> it appears that SAHS increases <span class="elsevierStyleItalic">insulin resistance</span> independently of obesity&#46; Ip et al&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> analyzed the relationship between SAHS and insulin resistance in 270 non-diabetic subjects&#44; evaluated by the homeostatic model assessment &#40;HOMA&#41; index&#46; They found that patients with SAHS had a higher HOMA index&#44; i&#46;e&#46; they had more insulin resistance than patients without SAHS&#46; Furthermore&#44; both obesity and the apnea&#8211;hypopnea index &#40;AHI&#41; and minimum blood oxygen saturation &#40;SaO<span class="elsevierStyleInf">2</span>&#41; were independent determinants of insulin resistance&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">The effect of SAHS on insulin resistance appears to be not only independent of obesity&#44; but also of body fat distribution and sex&#46; In 194 non-diabetic patients with SAHS&#44; the HOMA index was higher in patients with severe SAHS&#44; and was independently associated with body mass index &#40;BMI&#41;&#44; AHI and plasma adiponectin concentration&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> Similarly&#44; in a population sample of 400 women aged between 20 and 70 years&#44; Theorell-Hagl&#246;w et al&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a> showed that insulin sensitivity was lower in patients with severe SAHS&#44; associating it with minimum SaO<span class="elsevierStyleInf">2</span>&#44; when adjusting for age&#44; waist&#8211;hip ratio&#44; physical activity&#44; smoking and alcohol consumption&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The influence of SAHS on the development of insulin resistance has also been confirmed in longitudinal studies&#44; such as that conducted by Lindberg et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> which analyzed its effect on carbohydrate metabolism in a population sample of men without diabetes&#46; They found that the desaturation index&#44; AHI&#44; and minimum SaO<span class="elsevierStyleInf">2</span> were independently related with changes in the HOMA index during patient follow-up&#46; Studies have also tried to adjust for the possible influence of obesity on the SAHS&#8211;insulin resistance association&#44; evaluating it in lean individuals&#46; Pamidi et al&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a> reported that lean men with SAHS have 27&#37; lower insulin sensitivity and 37&#37; higher insulin secretion than controls matched by age&#44; BMI&#44; family history and exercise levels&#46; Similar results were found in another study in lean men conducted in China&#46;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">39</span></a> Ultimately&#44; the available evidence appears to show that SAHS is independently related with the development of insulin resistance&#44; and therefore increases the risk of diabetes&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">An intermediate step in the natural history of the SAHS-diabetes relationship is the decrease in <span class="elsevierStyleItalic">glucose tolerance</span>&#46; In fact&#44; in 150 healthy men with neither diabetes nor cardiopulmonary disease&#44; an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>5 was found to double the risk of glucose intolerance&#44; depending mainly on the severity of the nocturnal desaturation&#46;<a class="elsevierStyleCrossRef" href="#bib0200"><span class="elsevierStyleSup">40</span></a> Similarly&#44; the <span class="elsevierStyleItalic">Cleveland Family Study</span> found that the principal determinant of glucose intolerance was time with SaO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#60;90&#37; &#40;CT90&#41;&#44; which was present in 32&#37; of subjects with SAHS&#46; Individuals with a CT90<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>2&#37; had 2&#46;33 &#40;95&#37; CI&#58; 1&#46;38&#8211;3&#46;94&#41; times the risk of glucose intolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">41</span></a> In the <span class="elsevierStyleItalic">Sleep Heart Health Study</span>&#44; the largest epidemiological study conducted to date&#44; investigators assessed the presence of SAHS by polysomnography&#44; and measured baseline glucose and insulin levels and then again following an oral glucose tolerance test &#40;OGTT&#41;&#46; They found that once adjusted for age&#44; BMI&#44; waist circumference&#44; race&#44; sex and smoking habits&#44; subjects with an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>15 had odds ratios of 1&#46;46 and 1&#46;44 for high baseline or post-OGTT blood glucose levels&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a> More recently&#44; Cizza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">43</span></a> reported that 44&#37; of sleep-deprived obese adults had glucose intolerance&#44; and that more severe SAHS was related with higher baseline blood glucose and insulin levels&#44; and with a poorer response to the OGTT &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0050" class="elsevierStylePara elsevierViewall">Finally&#44; there is also evidence directly linking SAHS with poorer <span class="elsevierStyleItalic">metabolic glucose control</span>&#46;<a class="elsevierStyleCrossRefs" href="#bib0180"><span class="elsevierStyleSup">36&#44;44&#8211;50</span></a> In patients with no known diabetes&#44; a dose-response relationship was observed between AHI and the percentage of poor blood glucose control&#44; defined as a glycated hemoglobin level &#40;HbA1c&#41;<span class="elsevierStyleHsp" style=""></span>&#62;6&#37;&#44; which rose to 34&#46;2&#37; when the AHI was greater than 50&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a> With respect to subjects with an AHI<span class="elsevierStyleHsp" style=""></span>&#60;5&#44; the presence of an AHI of 15&#8211;30 or &#8805;50 had an adjusted odds ratio for poor blood glucose control of 1&#46;80 &#40;1&#46;19&#8211;2&#46;72&#41; and 2&#46;96 &#40;1&#46;58&#8211;5&#46;54&#41;&#44; respectively&#46; Moreover&#44; hypoxemia during sleep was also related with HbA1c<span class="elsevierStyleHsp" style=""></span>&#62;6&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">In short&#44; the data from various clinical and epidemiological studies support an association between SAHS and impaired glucose homeostasis&#44; which exposes these patients to a higher risk of developing diabetes&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Prevalence of Sleep Apnea&#8211;Hypopnea Syndrome in Patients With Type 2 Diabetes</span><p id="par0060" class="elsevierStylePara elsevierViewall">Despite notable methodological limitations&#44; several studies report a higher prevalence of SAHS in patients with DM2 than in the general population&#46;<a class="elsevierStyleCrossRefs" href="#bib0260"><span class="elsevierStyleSup">52&#8211;57</span></a> Unfortunately&#44; as yet&#44; few studies have used universally accepted diagnostic methods such as polygraphy and polysomnography&#46; The main evidence comes from various sub-analyses in a multiethnic cohort of subjects aged over 40 years with no known cardiovascular disease&#44; enrolled in the <span class="elsevierStyleItalic">Sleep Heart Health Study&#46;</span> In a sample of 4991 participants&#44; it was found that the Respiratory Disturbance Index &#40;RDI&#41; was associated with the presence of diabetes&#44; as well as age&#44; BMI&#44; waist&#8211;hip ratio&#44; hypertension and lipid levels&#46;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">58</span></a> In another series of 5874 subjects&#44; differences were noted in the RDI and the CT90 between diabetic and non-diabetic patients&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a> When the presence of SAHS was measured in the same cohort using polysomnography&#44; it was found in 58&#37; of the group of patients with DM2&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> Two subsequent studies also identified high prevalence of SAHS in patients with DM2&#58; in one&#44; up to 62&#37; of patients hospitalized for poorly controlled DM2 had SAHS &#40;34&#37; mild&#44; 19&#37; moderate and 10&#37; severe&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">55</span></a> and in the other&#44; SAHS was found in 86&#37; of obese diabetics&#46;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">56</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Prevalence of Type 2 Diabetes in Patients With Sleep Apnea&#8211;Hypopnea Syndrome</span><p id="par0065" class="elsevierStylePara elsevierViewall">The prevalence of DM2 in patients with SAHS ranges from 15&#37; to 30&#37;&#44; depending on the study population&#44; definition of severity of SAHS&#44; and the diagnostic methods used&#46;<a class="elsevierStyleCrossRefs" href="#bib0305"><span class="elsevierStyleSup">61&#44;62</span></a> The <span class="elsevierStyleItalic">Wisconsin Sleep Cohort</span> study detected a higher prevalence of DM2 in patients with SAHS &#40;14&#46;7&#37; vs 2&#46;8&#37;&#41;&#44; with an adjusted <span class="elsevierStyleItalic">odds ratio</span> of 2&#46;3 &#40;1&#46;28&#8211;4&#46;11&#41; for an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>15 with respect to an AHI<span class="elsevierStyleHsp" style=""></span>&#60;5&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">48</span></a> In contrast&#44; a multiethnic study of 1008 patients with DM2&#44; predominantly Hispanic and African-American&#44; gave negative results&#46; Although the prevalence of DM2 was also higher in subjects with SAHS than in nonapneic subjects &#40;30&#46;1&#37; vs 18&#46;6&#37;&#41;&#44; giving an <span class="elsevierStyleItalic">odds ratio</span> of 1&#46;8 &#40;1&#46;3&#8211;2&#46;6&#41;&#44; this association was not significant when controlling for various confounding factors&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">63</span></a> However&#44; another cross-sectional study conducted in a much larger sample &#40;14&#44;440 subjects in the <span class="elsevierStyleItalic">Hispanic Community Health Study&#47;Study of Latinos</span>&#41; confirmed that moderate SAHS is associated with both glucose intolerance &#40;<span class="elsevierStyleItalic">odds ratio</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;7&#59; 95&#37; CI&#58; 1&#46;3&#8211;2&#46;1&#41; and diabetes &#40;2&#46;3&#59; 1&#46;8&#8211;2&#46;9&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">64</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">In addition to the relationship between SAHS and DM2 shown in these cross-sectional studies&#44; some longitudinal studies indicate that the existence of apneas&#8211;hypopneas may lead to the development of diabetes&#46; Marshall et al&#46;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">61</span></a> provided the first evidence that moderate&#8211;severe SAHS is a risk factor for diabetes&#46; After a 4-year follow-up of an Australian population cohort&#44; they found that 20&#37; of patients with moderate&#8211;severe SAHS had been diagnosed with DM2&#44; showing that SAHS is an independent risk factor for incident diabetes &#40;adjusted hazard ratio<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>13&#46;45&#59; 95&#37; CI&#58; 1&#46;59&#8211;114&#46;11&#41;&#46; Lindberg et al&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> reported that this effect is not confined to the moderate&#8211;severe forms&#46; In an 11-year follow-up of a population sample of non-diabetic men&#44; they found that&#44; after adjusting for confounders&#44; a desaturation index<span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>5 was a predictor for the onset of diabetes &#40;4&#46;4&#59; 1&#46;1&#8211;18&#46;1&#41;&#46; Another observational study of a cohort of 1233 patients in the <span class="elsevierStyleItalic">Veteran Affairs Connecticut Health Care System</span> confirmed the role of SAHS as a risk factor for DM2&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">65</span></a> After adjusting for age&#44; sex&#44; race&#44; baseline fasting blood glucose&#44; BMI and weight change&#44; an independent association was detected between SAHS and incident diabetes &#40;1&#46;43&#59; 1&#46;10&#8211;1&#46;86&#41;&#46; A 16-year follow-up of a small cohort of middle-aged women referred to a sleep clinic also found that SAHS predicted the appearance of new-onset diabetes in females&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">62</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">The overall value of the available evidence has recently been evaluated in a meta-analysis of six prospective cohort studies with a total of 5953 participants and a follow-up period of 2&#46;7&#8211;16 years&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a> This analysis confirmed that moderate&#8211;severe SAHS is associated with a higher risk of diabetes &#40;relative risk<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;63&#59; 95&#37; CI&#58; 1&#46;09&#8211;2&#46;45&#41;&#44; when compared with the absence of SAHS &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; However&#44; patients with mild SAHS did not show a higher risk than nonapneic patients &#40;1&#46;22&#59; 0&#46;91&#8211;1&#46;63&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a></p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Pathogenic Mechanisms</span><p id="par0080" class="elsevierStylePara elsevierViewall">A better understanding of the effects of physiopathological disorders caused by apneas&#8211;hypopneas on glucose metabolism lends greater plausibility to the SAHS-DM2 relationship and can be summarized as follows&#58; SAHS activates 2 triggering mechanisms&#44; intermittent hypoxia and sleep fragmentation&#44; which induce various intermediate disorders&#44; such as activation of the sympathetic nervous system&#44; oxidative stress&#44; systemic inflammation&#44; alterations in appetite-regulating hormones and activation of the hypothalamic&#8211;pituitary&#8211;adrenal axis&#44; which in turn contribute to the development of insulin resistance&#44; progression to glucose intolerance&#44; and ultimately&#44; to DM2 &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Intermittent Hypoxia</span><p id="par0085" class="elsevierStylePara elsevierViewall">In addition to continuous hypoxia&#44;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">67&#8211;70</span></a> studies with animal models have shown that intermittent hypoxia can cause insulin resistance&#46; In lean mice&#44; exposure to successive intermittent hypoxia cycles reduced insulin sensitivity&#44; compared to exposure to synthetic air&#44; essentially due to reduced glucose utilization in oxidative muscle fibers&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">71</span></a> It appears that intermittent hypoxia only worsens glucose homeostasis during periods of hypoxic exposure&#44; and induces pancreatic &#946;-cell replication&#44; probably to compensate for diminished insulin sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">72</span></a> This compensatory response&#44; however&#44; is overridden by the presence of hyperglycemia&#44; which increases apoptosis in &#946;-cells and inhibits their replication&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">72</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">The effects of intermittent hypoxia on glucose metabolism in humans are less well known&#46; However&#44; Louis and Punjabi<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> showed&#44; in healthy volunteers subjected to intermittent hypoxia or normoxia&#44; that the former was associated with a reduction in insulin sensitivity and glucose effectiveness&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> Moreover&#44; intermittent hypoxia is accepted as one of the main determinants of HbA1c in patients with SAHS&#46; A recent study evaluated factors related with HbA1c levels in 164 patients with SAHS and normal glucose tolerance&#44; 111 with impaired tolerance&#44; and 55 with diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">74</span></a> They found that HbA1c was correlated with minimum saturation in all patients&#44; while no correlation was found with the AHI in patients with DM2 or normal blood glucose&#46; This&#44; therefore&#44; suggests that the correlation between SAHS and HbA1c in patients with DM2 is more dependent on minimum SaO<span class="elsevierStyleInf">2</span> levels than on the AHI&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">74</span></a> Similarly&#44; other authors report that the AHI is only associated with HbA1c during the REM sleep phase&#44;<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">75</span></a> which could in part explain individual variability&#46; Another possible explanation for inter-subject variation lies in alterations in hypoxia-inducible factor-1&#44; which triggers the expression of specific genes in the presence of a low oxygen levels&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">76</span></a> In diabetic rats&#44; an increase in hypoxia-inducible factor-1 expression by pancreatic &#946;-cells&#44; which inhibits glucose transport and perpetuates a state of insulin resistance&#44; has been reported&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">77</span></a></p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Sleep Fragmentation</span><p id="par0095" class="elsevierStylePara elsevierViewall">In laboratory conditions&#44; complete sleep deprivation has been found to reduce glucose tolerance&#46;<a class="elsevierStyleCrossRefs" href="#bib0230"><span class="elsevierStyleSup">46&#44;78&#8211;80</span></a> Various observational studies in the general population have also shown a relationship between sleep deprivation and altered glucose metabolism&#46; The <span class="elsevierStyleItalic">Sleep Heart Health Study</span> confirmed that less than 6<span class="elsevierStyleHsp" style=""></span>h sleep is associated with a higher prevalence of diabetes or glucose intolerance than 7&#8211;8<span class="elsevierStyleHsp" style=""></span>h of sleep&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> In addition&#44; a considerable number of longitudinal studies indicate that sleep restriction increases the risk of developing diabetes&#46; An analysis of the <span class="elsevierStyleItalic">First National Health and Nutrition Examination Survey</span> showed that fewer than 5<span class="elsevierStyleHsp" style=""></span>hours sleep resulted in a 1&#46;47-fold increase in the risk of developing diabetes during an 8&#8211;10 year follow-up&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">49</span></a> In more than 1000 men enrolled in the <span class="elsevierStyleItalic">Massachusetts Male Aging Study</span>&#44; the risk of developing diabetes in subjects reporting a shorter average sleep time was double that of those sleeping for 7&#8211;8<span class="elsevierStyleHsp" style=""></span>h&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">81</span></a> Although there is as yet little information on this aspect&#44; the effect of sleep restriction on the risk of developing diabetes appears to be sex-dependent&#46;<a class="elsevierStyleCrossRefs" href="#bib0410"><span class="elsevierStyleSup">82&#44;83</span></a> In more than 70&#44;000 non-diabetic adult women included in the <span class="elsevierStyleItalic">Nurses Health study</span>&#44; sleeping less than 5<span class="elsevierStyleHsp" style=""></span>h was found to increase the risk of developing diabetes in 10 years by 1&#46;57-fold&#44; although significance was reduced when adjusted for BMI and other confounding factors&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">47</span></a> Therefore&#44; sleep restriction appears to be an independent risk factor for diabetes&#44; primarily in men&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">In addition to studies in the general population&#44; several authors have evaluated the duration and quality of sleep in patients with diabetes&#46;<a class="elsevierStyleCrossRefs" href="#bib0420"><span class="elsevierStyleSup">84&#44;85</span></a> Most found that poor sleep quality was more prevalent in patients with diabetes&#44;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">85</span></a> and that this negatively affected blood glucose control&#46;<a class="elsevierStyleCrossRefs" href="#bib0420"><span class="elsevierStyleSup">84&#44;85</span></a> The influence of quality of sleep on glucose tolerance has also been investigated in various longitudinal series&#46;<a class="elsevierStyleCrossRefs" href="#bib0245"><span class="elsevierStyleSup">49&#44;82&#44;83&#44;86&#44;87</span></a> Apart from one study&#44;<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">83</span></a> all report an increased risk of diabetes associated with sleep disorders&#46; The potential contribution of sleep fragmentation to the SAHS&#8211;diabetes relationship is evidenced by the importance of sleepiness&#44; as demonstrated by Barcel&#243; et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">88</span></a> who found that patients with SAHS and excessive daytime sleepiness have a higher HOMA index than non-sleepy patients with SAHS or healthy controls&#46;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">88</span></a> The loss of REM sleep&#44; due to sleep fragmentation&#44; may also contribute to the development of diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">89</span></a> REM sleep has high energy requirements due to sustained neuronal activity&#44; and is accompanied by an increase in cerebral glucose uptake as well as reduced insulin and glucagon levels&#46;<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">90</span></a> Therefore&#44; the higher prevalence of diabetes in SAHS patients with a greater clustering of respiratory events during REM sleep<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">91</span></a> could be related with fragmentation of this sleep phase&#46;<a class="elsevierStyleCrossRef" href="#bib0460"><span class="elsevierStyleSup">92</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Activation of the Sympathetic Nervous System</span><p id="par0105" class="elsevierStylePara elsevierViewall">The sympathetic nervous system plays an important role in the metabolic regulation of glucose and fat&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;94</span></a> Catecholamines are known to reduce insulin sensitivity&#44; insulin-mediated glucose uptake&#44;<a class="elsevierStyleCrossRef" href="#bib0475"><span class="elsevierStyleSup">95</span></a> promote pancreatic &#946;-cell apoptosis&#44; and reduce insulin secretion&#46;<a class="elsevierStyleCrossRefs" href="#bib0480"><span class="elsevierStyleSup">96&#44;97</span></a> They can also inhibit insulin-mediated glycogenesis and increase glycolysis&#46;<a class="elsevierStyleCrossRefs" href="#bib0475"><span class="elsevierStyleSup">95&#44;96&#44;98</span></a> Increased sympathetic activity has lipolytic effects&#44; releasing circulating fatty acids&#44; which reduce insulin sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">93</span></a> Furthermore&#44; sympathetic vasoconstriction may reduce glucose and insulin supply to skeletal muscles&#44; directing the blood flow toward less metabolically active areas&#44; which reduces the net glucose uptake&#46;<a class="elsevierStyleCrossRef" href="#bib0495"><span class="elsevierStyleSup">99</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">The succession of hypoxemia-reoxygenation periods that accompany apneas&#8211;hypopneas are known to affect the sensitivity of peripheral chemoreceptors in patients with SAHS&#44;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;100</span></a> and stimulation of these receptors is known to increase sympathetic nervous system activity&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;101</span></a> Since activation of the sympathetic nervous system appears to have an impact on insulin sensitivity&#44; it has been suggested that this plays a major role in the development of insulin resistance in patients with SAHS&#46;<a class="elsevierStyleCrossRef" href="#bib0510"><span class="elsevierStyleSup">102</span></a></p><p id="par0115" class="elsevierStylePara elsevierViewall">Experimental evidence supports the suggestion that increased basal sympathetic tone plays an essential role in the SAHS-DM2 relationship&#46; Glucose intolerance caused in healthy volunteers by exposure to periods of acute hypoxia is associated with an increase in plasma catecholamines&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">70</span></a> In healthy volunteers subjected to intermittent hypoxia&#44; reduced insulin sensitivity and glucose effectiveness have been associated with a shift in the sympathovagal balance&#44; predominantly toward sympathetic nervous system activity&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> However&#44; blocking sympathetic activity in an animal model does not mitigate the short-term negative effects of intermittent hypoxia on insulin sensitivity&#44; suggesting the involvement of other alternative pathways&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">71</span></a> In any event&#44; this finding does not rule out that hypoxic activation of the sympathetic nervous system contributes to long-term progression of insulin resistance&#44; which may occur for decades in patients with SAHS&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Oxidative Stress</span><p id="par0120" class="elsevierStylePara elsevierViewall">An excess of reactive oxygen species &#40;ROS&#41; may inhibit insulin-induced energy substrate uptake in muscle and adipose tissue&#44; and may damage pancreatic &#946;-cells due to their relatively low concentration of antioxidant enzymes&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;103</span></a> Moreover&#44; the formation of ROS may suppress insulin secretion and worsen insulin sensitivity&#46;<a class="elsevierStyleCrossRefs" href="#bib0520"><span class="elsevierStyleSup">104&#44;105</span></a> In fact&#44; studies at cellular level show that intermittent hypoxia has a negative effect on &#946;-cell proliferation and death&#44; which seems to be attributable to greater cellular oxidative stress&#46;<a class="elsevierStyleCrossRef" href="#bib0530"><span class="elsevierStyleSup">106</span></a></p><p id="par0125" class="elsevierStylePara elsevierViewall">In animal models&#44; intermittent hypoxia has been shown to stimulate the release of ROS&#44; contributing to a proinflammatory state&#46;<a class="elsevierStyleCrossRef" href="#bib0535"><span class="elsevierStyleSup">107</span></a> As a result&#44; plasma cholesterol levels increase&#44; as hepatic uptake is inhibited&#44;<a class="elsevierStyleCrossRef" href="#bib0540"><span class="elsevierStyleSup">108</span></a> leading to insulin resistance&#44; increasing insulin levels and reducing glucose tolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0545"><span class="elsevierStyleSup">109</span></a> In healthy volunteers&#44; intermittent hypoxia has also been shown to increase ROS&#44;<a class="elsevierStyleCrossRef" href="#bib0550"><span class="elsevierStyleSup">110</span></a> associated with decreased insulin sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> Therefore&#44; the increase in oxidative stress seen in patients with SAHS<a class="elsevierStyleCrossRefs" href="#bib0555"><span class="elsevierStyleSup">111&#44;112</span></a> could contribute to the development of insulin resistance&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Systemic Inflammation</span><p id="par0130" class="elsevierStylePara elsevierViewall">Several lines of evidence converge to implicate sub-clinical inflammation in the pathogenesis of insulin resistance and diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">93</span></a> Diabetic patients have a baseline proinflammatory state&#44; characterized by high circulating levels of inflammatory cytokines such as interleukin-6&#44; tumor necrosis factor-&#945;&#44; C-reactive protein and interleukin-18&#46;<a class="elsevierStyleCrossRefs" href="#bib0565"><span class="elsevierStyleSup">113&#44;114</span></a> Interleukin-6 and tumor necrosis factor-&#945; in particular have been implicated in the pathogenesis of insulin resistance and DM2&#46;<a class="elsevierStyleCrossRefs" href="#bib0575"><span class="elsevierStyleSup">115&#8211;117</span></a> Similarly&#44; other studies have documented the existence of a proinflammatory state in patients with SAHS&#46;<a class="elsevierStyleCrossRefs" href="#bib0420"><span class="elsevierStyleSup">84&#44;118</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">Although the mechanism by which systemic inflammation contributes to the development of insulin resistance in SAHS is still not fully understood&#44; macrophage recruitment and the lipotoxic pathway seem especially relevant&#46; Chronic inflammation causes macrophage activation and accumulation in the pancreatic islets of patients with DM2&#44; which could contribute to tissue destruction and abnormal repair&#46;<a class="elsevierStyleCrossRefs" href="#bib0595"><span class="elsevierStyleSup">119&#44;120</span></a> The lipotoxic effects of obesity may also play an important role in the pathogenesis of insulin resistance by activating the proinflammatory pathway&#46; This is because adipocytes are a principal source of cytokines&#44; which are secreted into the circulation depending on the size of the adipocyte&#44; creating a directly proportional relationship between fat mass and circulating cytokines&#46;<a class="elsevierStyleCrossRefs" href="#bib0605"><span class="elsevierStyleSup">121&#44;122</span></a></p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Alteration in Appetite-regulating Hormones</span><p id="par0140" class="elsevierStylePara elsevierViewall">The main hormones involved in this function are leptin&#44; adiponectin and resistin&#46;<a class="elsevierStyleCrossRef" href="#bib0615"><span class="elsevierStyleSup">123</span></a> Leptin regulates hunger and weight gain at central level&#44; increasing the hypothalamic expression of anorexigenic peptides and decreasing the expression of orexigenic peptides&#44;<a class="elsevierStyleCrossRef" href="#bib0620"><span class="elsevierStyleSup">124</span></a> while at peripheral level it appears to be implicated in glucose homeostasis&#46;<a class="elsevierStyleCrossRef" href="#bib0625"><span class="elsevierStyleSup">125</span></a> Adiponectin is synthesized by the adipocytes and regulates their sensitivity to insulin&#46;<a class="elsevierStyleCrossRef" href="#bib0630"><span class="elsevierStyleSup">126</span></a> Low circulating adiponectin levels are a major risk factor for diabetes&#44; atherosclerosis and dyslipidemia&#46;<a class="elsevierStyleCrossRef" href="#bib0635"><span class="elsevierStyleSup">127</span></a> In contrast&#44; high adiponectin concentrations have protective properties against diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">93</span></a> Although the role of resistin is more uncertain&#44; it is thought to increase hepatic insulin resistance and reduce glucose tolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0640"><span class="elsevierStyleSup">128</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">Some authors have reported that SAHS patients have lower plasma leptin levels than healthy subjects&#44;<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">80</span></a> although the role of obesity as a confounding factor has not always been properly controlled&#46;<a class="elsevierStyleCrossRef" href="#bib0645"><span class="elsevierStyleSup">129</span></a> This hormone appears to contribute significantly to the development of insulin resistance in SAHS&#46; In leptin-deficient obese mice&#44; intermittent hypoxia induces a decrease in blood glucose and an increase in serum insulin&#44; both in the short and long term&#44; consistent with greater insulin resistance&#46;<a class="elsevierStyleCrossRef" href="#bib0545"><span class="elsevierStyleSup">109</span></a> These responses are blocked when the animals are given a previous infusion of leptin&#44;<a class="elsevierStyleCrossRef" href="#bib0545"><span class="elsevierStyleSup">109</span></a> suggesting that the increased insulin resistance caused by the intermittent hypoxia is dependent on disruption of the leptin pathway&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">Resistin is another adipokine that may contribute to obesity&#44;<a class="elsevierStyleCrossRef" href="#bib0650"><span class="elsevierStyleSup">130</span></a> insulin resistance<a class="elsevierStyleCrossRef" href="#bib0655"><span class="elsevierStyleSup">131</span></a> and metabolic syndrome&#46;<a class="elsevierStyleCrossRef" href="#bib0660"><span class="elsevierStyleSup">132</span></a> Although some authors<a class="elsevierStyleCrossRef" href="#bib0665"><span class="elsevierStyleSup">133</span></a> found no association between plasma resistin levels in patients with SAHS and insulin resistance&#44; determined by the HOMA index&#44; other studies show that the plasma resistin concentration is higher in SAHS patients with DM2 compared to those with glucose intolerance or normal glucose metabolism&#46;<a class="elsevierStyleCrossRef" href="#bib0670"><span class="elsevierStyleSup">134</span></a></p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Activation of the Hypothalamic&#8211;Pituitary&#8211;Adrenal Axis</span><p id="par0155" class="elsevierStylePara elsevierViewall">Cortisol and other glucocorticosteroids interfere with carbohydrate metabolism by increasing glucose production&#44; decreasing glucose uptake in peripheral tissues and inhibiting the release of insulin from the pancreatic &#946;-cells&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;99</span></a></p><p id="par0160" class="elsevierStylePara elsevierViewall">Activation of the sympathetic nervous system could increase the activity of the hypothalamic&#8211;pituitary&#8211;adrenal axis&#44; increasing cortisol synthesis&#44; which leads to insulin resistance and hyperglycemia&#46;<a class="elsevierStyleCrossRef" href="#bib0675"><span class="elsevierStyleSup">135</span></a> In fact&#44; studies at altitude or under hypobaric conditions confirm that hypoxia modifies the function of the hypothalamic&#8211;pituitary&#8211;adrenal axis and increases circulating cortisol levels&#46;<a class="elsevierStyleCrossRef" href="#bib0675"><span class="elsevierStyleSup">135</span></a> Furthermore&#44; alterations in the secretion of the appetite-regulating hormones may also affect glucose homeostasis&#44; increasing nocturnal growth hormone levels and evening cortisol levels&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">46</span></a> There are few studies as yet in humans that have examined the changes in cortisol secretion induced by SAHS&#46; Although one study indicated that SAHS does not affect cortisol levels&#44;<a class="elsevierStyleCrossRef" href="#bib0680"><span class="elsevierStyleSup">136</span></a> in other cases a cortisol concentration higher than that of weight-matched controls&#44; which fell after CPAP treatment&#44; has been described&#46;<a class="elsevierStyleCrossRef" href="#bib0685"><span class="elsevierStyleSup">137</span></a></p><p id="par0165" class="elsevierStylePara elsevierViewall">In conclusion&#44; based on the current information&#44; we can establish a correlation between intermittent hypoxia and sleep fragmentation caused by SAHS and the development of insulin resistance&#44; via various pathogenic pathways&#46; Nevertheless&#44; the molecular mechanisms of cell signaling that lead to increased insulin resistance in these patients are still not sufficiently understood&#46;</p></span></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Clinical and Prognostic Relevance of the Sleep Apnea&#8211;Hypopnea Syndrome&#8211;Diabetes Association</span><p id="par0170" class="elsevierStylePara elsevierViewall">In recent years&#44; a growing body of evidence has suggested that SAHS could increase the severity of DM2&#44;<a class="elsevierStyleCrossRefs" href="#bib0690"><span class="elsevierStyleSup">138&#8211;140</span></a> but it also raises the interesting possibility of a reciprocal relationship&#46;</p><p id="par0175" class="elsevierStylePara elsevierViewall">Aronsohn et al&#46;<a class="elsevierStyleCrossRef" href="#bib0705"><span class="elsevierStyleSup">141</span></a> showed that SAHS worsens blood glucose control in DM2&#46; Compared to control subjects&#44; mean adjusted HbA1c increased by 1&#46;49&#37; in patients with mild SAHS&#44; 1&#46;93&#37; in moderate SAHS and 3&#46;69&#37; in severe SAHS &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>&#41;&#46; Furthermore&#44; other measures of SAHS severity&#44; such as the AHI and desaturation during the REM phase&#44; were also related to HbA1c levels&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0180" class="elsevierStylePara elsevierViewall">The leading cause of morbidity and mortality in patients with DM2 is the development of micro- or macrovascular complications&#44; which can also be affected by SAHS&#46; Macrovascular complications&#44; which include ischemic heart disease&#44; peripheral artery disease and cerebrovascular disease&#44; are due to the harmful effects of hyperglycemia&#44;<a class="elsevierStyleCrossRefs" href="#bib0710"><span class="elsevierStyleSup">142&#44;143</span></a> as well as atherosclerosis&#46; SAHS may also worsen certain typical microvascular complications&#44; such as retinopathy&#44; nephropathy and neuropathy&#46;<a class="elsevierStyleCrossRefs" href="#bib0690"><span class="elsevierStyleSup">138&#44;144</span></a> Various mechanisms are potentially involved in the development of microvascular complications&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> SAHS increases the production of advanced glycation end or waste products&#44;<a class="elsevierStyleCrossRef" href="#bib0730"><span class="elsevierStyleSup">146</span></a> and has been associated with an alteration in protein kinase C signaling&#44; which plays an important role in the cell response to hypoxia&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> SAHS is also associated with a decrease in endothelial nitric oxide synthase and an increase in endothelin-1 levels&#44;<a class="elsevierStyleCrossRef" href="#bib0735"><span class="elsevierStyleSup">147</span></a> with hypercoagulability<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> and inflammation&#46;<a class="elsevierStyleCrossRef" href="#bib0590"><span class="elsevierStyleSup">118</span></a> Repeated hypoxemia-reoxygenation episodes&#44; meanwhile&#44; induce ROS production&#46;<a class="elsevierStyleCrossRef" href="#bib0560"><span class="elsevierStyleSup">112</span></a> The final result of this process&#44; aggravated by the effect of hyperglycemia and hypertension&#44; is the development of endothelial dysfunction and microvascular impairment &#40;<a class="elsevierStyleCrossRef" href="#fig0025">Fig&#46; 5</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Retinopathy</span><p id="par0185" class="elsevierStylePara elsevierViewall">Despite some findings to the contrary&#44;<a class="elsevierStyleCrossRef" href="#bib0740"><span class="elsevierStyleSup">148</span></a> most studies show an association between SAHS and severity of retinopathy&#44; as well as a higher risk of progression&#46; In a cross-sectional case-control study that included 68 patients with non-proliferative diabetic retinopathy and 151 patients with proliferative diabetic retinopathy&#44; the severity of nocturnal desaturations &#40;evaluated by means of the desaturation index and the minimum SaO<span class="elsevierStyleInf">2</span>&#41; was a risk factor for proliferative diabetic retinopathy&#44; suggesting that the reoxygenation caused by the SAHS could affect retinopathy progression&#46;<a class="elsevierStyleCrossRef" href="#bib0745"><span class="elsevierStyleSup">149</span></a> In another study conducted in men with DM2&#44; SAHS was independently associated with retinopathy and diabetic maculopathy&#46;<a class="elsevierStyleCrossRef" href="#bib0695"><span class="elsevierStyleSup">139</span></a> A longitudinal study has also shown that patients with SAHS have a higher risk of developing advanced diabetic retinopathy&#46;<a class="elsevierStyleCrossRef" href="#bib0750"><span class="elsevierStyleSup">150</span></a> In a recent cross-sectional study in obese men with DM2&#44; Rudrappa et al&#46;<a class="elsevierStyleCrossRef" href="#bib0755"><span class="elsevierStyleSup">151</span></a> described worsening of retinopathy but not of maculopathy&#44; and a higher proportion of patients with proliferative diabetic retinopathy in the SAHS group&#46; Moreover&#44; SAHS was the only independent predictor of retinopathy after adjusting for new serum biomarkers of retinopathy and inflammation&#46;<a class="elsevierStyleCrossRef" href="#bib0755"><span class="elsevierStyleSup">151</span></a></p></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Nephropathy</span><p id="par0190" class="elsevierStylePara elsevierViewall">Data on this other major complication of diabetes is contradictory&#46; Schober et al&#46;<a class="elsevierStyleCrossRef" href="#bib0760"><span class="elsevierStyleSup">152</span></a> found a higher prevalence of nephropathy in adult diabetics with an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>15 than in nonapneic patients&#46; Although other authors have not identified a relationship between the presence of SAHS in patients with DM2 and the existence of microalbuminuria&#44;<a class="elsevierStyleCrossRef" href="#bib0700"><span class="elsevierStyleSup">140</span></a> in a group of patients with renal failure secondary to diabetes&#44; SAHS was associated with a higher risk of hemodialysis and hypertension&#46;<a class="elsevierStyleCrossRef" href="#bib0765"><span class="elsevierStyleSup">153</span></a></p><p id="par0195" class="elsevierStylePara elsevierViewall">In general&#44; renal ischemia and hypoxia are considered to be key factors for the development of renal failure&#46; Several studies suggest that an increase in the severity of SAHS is related with a deterioration in renal function&#44; irrespective of established risk factors for nephropathy progression&#46;<a class="elsevierStyleCrossRef" href="#bib0720"><span class="elsevierStyleSup">144</span></a> Several mechanisms have been proposed to explain this&#46; Intermittent hypoxia and sleep fragmentation caused by SAHS are known to activate the sympathetic nervous system and the renin&#8211;angiotensin&#8211;aldosterone system&#44; increase cytokine levels&#44; and contribute to oxidative stress&#46; The increased generation of free radicals gives rise to a number of harmful processes&#44; such as endothelial dysfunction&#44; inflammation&#44; platelet aggregation&#44; atherosclerosis and fibrosis&#44; which may increase the risk of renal damage in patients with SAHS&#46; Furthermore&#44; it is important to consider that SAHS is an independent risk factor of hypertension and glomerular hyperfiltration&#44; and could be an independent predictor of proteinuria&#44; a sign of renal disease and a risk factor for progression of chronic nephropathy to end-stage renal disease&#46;<a class="elsevierStyleCrossRef" href="#bib0720"><span class="elsevierStyleSup">144</span></a></p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Neuropathy</span><p id="par0200" class="elsevierStylePara elsevierViewall">Diabetic neuropathies are a heterogeneous group of disorders that affect different parts of the nervous system&#44; including generalized symmetrical polyneuropathies&#44; multifocal and focal neuropathies and autonomic neuropathy&#46; Mayer et al&#46;<a class="elsevierStyleCrossRef" href="#bib0770"><span class="elsevierStyleSup">154</span></a> showed that patients with severe SAHS have peripheral nerve dysfunction caused by axonal lesions&#44; the severity of which is partially related with nocturnal hypoxemia&#46; Raman et al&#46;<a class="elsevierStyleCrossRef" href="#bib0775"><span class="elsevierStyleSup">155</span></a> later evaluated the risk of neuropathy in 1414 patients with DM2&#44; and found that the group of diabetic women with altered sleep patterns had a higher risk of developing neuropathy&#46; However&#44; another study that only included 40 patients did not identify any association between AHI and diabetic neuropathy&#46;<a class="elsevierStyleCrossRef" href="#bib0780"><span class="elsevierStyleSup">156</span></a></p><p id="par0205" class="elsevierStylePara elsevierViewall">More recently&#44; Tahrani et al&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> showed that SAHS is independently associated with diabetic neuropathy &#40;adjusted odds ratio<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>2&#46;82&#59; 95&#37; CI&#58; 1&#46;44&#8211;5&#46;52&#41;&#46; They found that the severity of diabetic neuropathy is related with the severity of both SAHS and nocturnal hypoxemia&#44; and identified potential pathogenic mechanisms&#44; including an increase in nitrosative stress&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> Finally&#44; a meta-analysis confirmed the relationship between SAHS and diabetic neuropathy&#46; The presence of SAHS was more frequent in DM2 patients with neuropathy &#40;<span class="elsevierStyleItalic">odds ratio</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;95&#59; 95&#37; CI&#58; 1&#46;03&#8211;3&#46;70&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0030">Fig&#46; 6</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0785"><span class="elsevierStyleSup">157</span></a></p><elsevierMultimedia ident="fig0030"></elsevierMultimedia></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Effect of Type 2 Diabetes Mellitus on Sleep Apnea&#8211;Hypopnea Syndrome</span><p id="par0210" class="elsevierStylePara elsevierViewall">Although scant&#44; some data suggest that DM2 might worsen the progression of SAHS &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46; In animal models&#44; insulin resistance has been shown to be associated with a lower ventilatory response&#46;<a class="elsevierStyleCrossRef" href="#bib0790"><span class="elsevierStyleSup">158</span></a> Furthermore&#44; the presence of diabetic neuropathy could increase upper airway collapsibility due to impairment of the dilatory muscles of the larynx&#44; and aggravate obstructive apneas&#8211;hypopneas&#46; Indeed&#44; patients with autonomic neuropathy have more severe SAHS&#44; with longer lasting respiratory events and more desaturation than diabetics with no autonomic neuropathy&#46;<a class="elsevierStyleCrossRef" href="#bib0795"><span class="elsevierStyleSup">159</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall">Diabetes&#44; moreover&#44; may also contribute to the onset of central apneas&#46; Diabetic patients in the <span class="elsevierStyleItalic">Sleep Heart Health Study</span> had a higher incidence of periodic breathing and central apneas than non-diabetic subjects&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a> It has been suggested that diabetes-associated autonomic neuropathy alters upper airway reflex responses&#44; peripheral control of upper airway muscles&#44; mechanoreceptor activation thresholds&#44; central ventilatory stability and control&#44; and peripheral response to hypercapnia and hypoxia&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;160</span></a> Chronic hyperglycemia&#44; moreover&#44; induces oxidative stress&#44; causing nerve dysfunction and structural damage&#44;<a class="elsevierStyleCrossRef" href="#bib0805"><span class="elsevierStyleSup">161</span></a> which could worsen autonomic dysfunction and aggravate sleep disordered breathing&#44; creating a vicious circle&#46; It is precisely this relationship that explains the effect of some general interventions that are beneficial in SAHS&#46; Exercise and increased physical activity&#44; therefore&#44; which can improve blood glucose control&#44; could also have a beneficial effect on the severity of SAHS that cannot be fully explained by the associated weight loss&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;162</span></a> Moreover&#44; some studies show that the weight loss is associated with substantial improvement in the severity of SAHS due to changes in the structure and function of the upper airways&#46;<a class="elsevierStyleCrossRefs" href="#bib0815"><span class="elsevierStyleSup">163&#44;164</span></a></p><p id="par0220" class="elsevierStylePara elsevierViewall">In conclusion&#44; there is growing evidence to associate SAHS with the development of DM2&#46; Further evidence of this is the existence of common pathogenic pathways that could have important prognostic implications&#44; not only for the progression of diabetic complications&#44; but also for a synergic effect on SAHS itself&#46;</p></span></span><span id="sec0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Funding</span><p id="par0225" class="elsevierStylePara elsevierViewall">Partially funded by the <span class="elsevierStyleGrantSponsor" id="gs0005">Spanish Society of Pulmonology and Thoracic Surgery</span> &#40;SEPAR&#41; &#40;<span class="elsevierStyleGrantNumber" refid="gs0005">034&#47;2013</span>&#41;&#44; the <span class="elsevierStyleGrantSponsor" id="gs0010">Health Research Fund</span> &#40;<span class="elsevierStyleGrantNumber" refid="gs0010">PI10&#47;00642</span> and <span class="elsevierStyleGrantNumber" refid="gs0010">PI13&#47;01512</span>&#41;&#44; the <span class="elsevierStyleGrantSponsor" id="gs0015">Ministry of Science and Education</span> &#40;<span class="elsevierStyleGrantNumber" refid="gs0015">SAF2007-62270</span>&#41; and the <span class="elsevierStyleGrantSponsor" id="gs0020">Program for R&#38;D in Biomedicine in the Madrid Region</span> &#40;<span class="elsevierStyleGrantNumber" refid="gs0020">S2010&#47;BMD-2542</span>&#41;&#46;</p></span><span id="sec0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Conflict of Interests</span><p id="par0230" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflict of interests&#46;</p></span></span>"
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          "identificador" => "xres436887"
          "titulo" => "Abstract"
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          "titulo" => "Introduction"
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          "titulo" => "Clinical and Epidemiological Evidence"
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              "titulo" => "Prevalence of Sleep Apnea&#8211;Hypopnea Syndrome in Patients With Type 2 Diabetes"
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              "identificador" => "sec0020"
              "titulo" => "Prevalence of Type 2 Diabetes in Patients With Sleep Apnea&#8211;Hypopnea Syndrome"
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          "titulo" => "Pathogenic Mechanisms"
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            0 => array:2 [
              "identificador" => "sec0030"
              "titulo" => "Intermittent Hypoxia"
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            1 => array:2 [
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              "titulo" => "Sleep Fragmentation"
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            2 => array:2 [
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              "titulo" => "Activation of the Sympathetic Nervous System"
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              "titulo" => "Alteration in Appetite-regulating Hormones"
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          "titulo" => "Clinical and Prognostic Relevance of the Sleep Apnea&#8211;Hypopnea Syndrome&#8211;Diabetes Association"
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            0 => array:2 [
              "identificador" => "sec0070"
              "titulo" => "Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Retinopathy"
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            1 => array:2 [
              "identificador" => "sec0075"
              "titulo" => "Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Nephropathy"
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            2 => array:2 [
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              "titulo" => "Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Neuropathy"
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            3 => array:2 [
              "identificador" => "sec0085"
              "titulo" => "Effect of Type 2 Diabetes Mellitus on Sleep Apnea&#8211;Hypopnea Syndrome"
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          "titulo" => "Funding"
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    "pdfFichero" => "main.pdf"
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    "fechaRecibido" => "2014-05-14"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Epidemiological data suggest that sleep apnea&#8211;hypopnea syndrome &#40;SAHS&#41; is independently associated with the development of insulin resistance and glucose intolerance&#46; Moreover&#44; despite significant methodological limitations&#44; some studies report a high prevalence of SAHS in patients with type 2 diabetes mellitus &#40;DM2&#41;&#46; A recent meta-analysis shows that moderate&#8211;severe SAHS is associated with an increased risk of DM2 &#40;relative risk<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;63 &#91;09&#8211;2&#46;45&#93;&#41;&#44; compared to the absence of apneas and hypopneas&#46;</p><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Common alterations in various pathogenic pathways add biological plausibility to this relationship&#46; Intermittent hypoxia and sleep fragmentation&#44; caused by successive apnea&#8211;hypopnea episodes&#44; induce several intermediate disorders&#44; such as activation of the sympathetic nervous system&#44; oxidative stress&#44; systemic inflammation&#44; alterations in appetite-regulating hormones and activation of the hypothalamic&#8211;pituitary&#8211;adrenal axis which&#44; in turn&#44; favor the development of insulin resistance&#44; its progression to glucose intolerance and&#44; ultimately&#44; to DM2&#46;</p><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Concomitant SAHS seems to increase DM2 severity&#44; since it worsens glycemic control and enhances the effects of atherosclerosis on the development of macrovascular complications&#46; Furthermore&#44; SAHS may be associated with the development of microvascular complications&#58; retinopathy&#44; nephropathy or diabetic neuropathy in particular&#46; Data are still scant&#44; but it seems that DM2 may also worsen SAHS progression&#44; by increasing the collapsibility of the upper airway and the development of central apneas and hypopneas&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Diversos datos epidemiol&#243;gicos muestran que el s&#237;ndrome de apneas-hipopneas del sue&#241;o &#40;SAHS&#41; se relaciona independientemente con el desarrollo de resistencia a la insulina e intolerancia a la glucosa&#46; Adem&#225;s&#44; y pese a la existencia de notables limitaciones metodol&#243;gicas&#44; algunos estudios refieren una elevada prevalencia de SAHS en pacientes con diabetes tipo 2 &#40;DM2&#41;&#46; Un reciente metaan&#225;lisis muestra que el SAHS moderado-grave se asocia a un mayor riesgo de DM2 &#40;riesgo relativo<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#44;63 &#91;09&#8211;2&#44;45&#93;&#41;&#44; en relaci&#243;n con la ausencia de apneas-hipopneas&#46;</p><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">La existencia de alteraciones comunes de diversas v&#237;as patog&#233;nicas le proporciona plausibilidad biol&#243;gica a esta relaci&#243;n&#46; La hipoxia intermitente y la fragmentaci&#243;n del sue&#241;o&#44; originadas por la sucesi&#243;n de episodios de apneas-hipopneas&#44; inducen diversos trastornos intermedios&#44; como la activaci&#243;n del sistema nervioso simp&#225;tico&#44; el estr&#233;s oxidativo&#44; la inflamaci&#243;n sist&#233;mica&#44; alteraciones en las hormonas reguladoras del apetito y activaci&#243;n del eje hipot&#225;lamo-hip&#243;fiso-suprarrenal&#44; que favorecen el desarrollo de resistencia a la insulina&#44; as&#237; como su progresi&#243;n a intolerancia a la glucosa y&#44; en &#250;ltima instancia&#44; a DM2&#46;</p><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">La coexistencia del SAHS parece agravar la evoluci&#243;n de la DM2&#44; al empeorar el control gluc&#233;mico y potenciar el efecto de la aterosclerosis en el desarrollo de complicaciones macrovasculares&#46; Adem&#225;s&#44; el SAHS podr&#237;a asociarse al desarrollo de complicaciones microvasculares&#44; particularmente la retinopat&#237;a&#44; nefropat&#237;a o neuropat&#237;a diab&#233;ticas&#46; Aunque todav&#237;a escasos&#44; algunos datos sugieren que la DM2 tambi&#233;n podr&#237;a empeorar la evoluci&#243;n del SAHS&#44; al favorecer la colapsabilidad de la v&#237;a a&#233;rea superior y potenciar la aparici&#243;n de apneas-hipopneas centrales&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Mart&#237;nez Cer&#243;n E&#44; Casitas Mateos R&#44; Garc&#237;a-R&#237;o F&#46; S&#237;ndrome de apneas-hipopneas del sue&#241;o y diabetes tipo 2&#46; &#191;Una relaci&#243;n de ida y vuelta&#63; Arch Bronconeumol&#46; 2015&#59;51&#58;128&#8211;139&#46;</p>"
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          "en" => "<p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Glycated hemoglobin &#40;HbA1c&#41; levels in controls and patients with varying SAHS severity&#46; The values are adjusted for age&#44; sex&#44; race&#44; body mass index&#44; diabetes medication&#44; level of exercise&#44; years of diabetes and total sleep time&#46; The bars represent the standard error of the mean&#46; Reproduced with the permission of the American Thoracic Society&#46; Copyright<span class="elsevierStyleSup">&#169;</span> 2014 American Thoracic Society&#46; Aronsohn et al&#46;<a class="elsevierStyleCrossRef" href="#bib0705"><span class="elsevierStyleSup">141</span></a></p>"
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                      "titulo" => "The occurrence of sleep disorders breathing among middle aged adults"
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                      "doi" => "10.1056/NEJM199304293281704"
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                      "titulo" => "Obstructive sleep apnea-hypopnea and related clinical features in a population-based sample of subjects aged 30 to 70 years"
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                      "titulo" => "Long-term cardiovascular outcomes in men with obstructive sleep apnoea&#8211;hypopnoea with or without treatment with continuous positive airway pressure&#58; an observational study"
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Review
Sleep Apnea–Hypopnea Syndrome and Type 2 Diabetes. A Reciprocal Relationship?
Síndrome de apneas-hipopneas del sueño y diabetes tipo 2. ¿Una relación de ida y vuelta?
Elisabet Martínez Ceróna, Raquel Casitas Mateosa, Francisco García-Ríoa,b,c,
Corresponding author
fgr01m@gmail.com

Corresponding author.
a Servicio de Neumología, Hospital Universitario La Paz, IdiPAZ, Madrid, Spain
b Universidad Autónoma de Madrid, Madrid, Spain
c CIBER de enfermedades respiratorias (CIBERES), Madrid, Spain
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        "titulo" => "S&#237;ndrome de apneas-hipopneas del sue&#241;o y diabetes tipo 2&#46; &#191;Una relaci&#243;n de ida y vuelta&#63;"
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          "en" => "<p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Risk of the association between moderate-severe &#40;A&#41; and mild SAHS &#40;B&#41; and type 2 diabetes&#46; CI&#58; confidence interval&#59; RR&#58; relative risk&#46; Adapted with the permission of the <span class="elsevierStyleItalic">Asian Pacific Society of Respirology</span>&#46; Copyright<span class="elsevierStyleSup">&#169;</span> 2012 Asian Pacific Society of Respirology&#46; Wang et al&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a></p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Sleep apnea&#8211;hypopnea syndrome &#40;SAHS&#41; is a public health problem of the first order&#44;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> due to its high prevalence<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#44;3</span></a> and marked morbidity and mortality&#44;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#8211;6</span></a> having been linked to traffic accidents&#44;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8</span></a> cardiovascular complications<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#8211;25</span></a> and&#44; more recently&#44; neoplastic diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> One increasingly interesting aspect is its relationship with metabolic disorders&#44; specifically type 2 diabetes &#40;DM2&#41;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Diabetes mellitus is a global epidemic&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">27</span></a> There are currently 382 million diabetics worldwide&#44; a figure which is estimated to reach 592 million in 2035&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> DM2&#44; which accounts for 90&#37;&#8211;95&#37; of all diabetes cases&#44;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> is a complex metabolic disorder in which the interaction of genetic and environmental factors causes a deficiency in both insulin secretion and insulin sensitivity&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">In healthy subjects&#44; glucose homeostasis is reached by controlling glucose production by the liver &#40;gluconeogenesis&#41; and its use by insulin-dependent tissues&#44; such as muscle and fat&#44; and by non-insulin-dependent tissues&#44; such as the brain&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a> Glucose uptake by peripheral tissues is regulated by insulin&#44; which is produced by pancreatic islet &#946;-cells&#44; both constitutionally and in response to an increase in blood glucose&#46; Insulin also suppresses hepatic gluconeogenesis and adipose tissue lipolysis&#46; The biological response of insulin target tissues &#40;insulin sensitivity&#41; has several physiological determinants&#44; particularly the amount of fatty tissue&#46; A decrease in the peripheral response to insulin &#40;insulin resistance&#41; reduces tissue glucose uptake and leads to glucose intolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> Failure by &#946;-cells to secrete sufficient insulin to overcome insulin resistance results in DM2&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The presence of common risk factors&#44; as well as the involvement of some shared pathogenic pathways&#44; explains the potential relationship between both entities&#46; Therefore&#44; the aims of this review were to analyze clinical&#8211;epidemiological data that support the existence of a possible relationship between SAHS and DM2&#44; to evaluate the pathogenic mechanisms potentially involved&#44; and to assess the prognostic impact of this relationship&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Clinical and Epidemiological Evidence</span><p id="par0025" class="elsevierStylePara elsevierViewall">Available evidence suggests that SAHS may alter glucose metabolism&#44; progressing from an increase in glucose resistance to glucose intolerance&#44; poorer metabolic control of blood glucose and&#44; ultimately&#44; DM2&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Despite the controversial findings in 1 preliminary study&#44;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> it appears that SAHS increases <span class="elsevierStyleItalic">insulin resistance</span> independently of obesity&#46; Ip et al&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> analyzed the relationship between SAHS and insulin resistance in 270 non-diabetic subjects&#44; evaluated by the homeostatic model assessment &#40;HOMA&#41; index&#46; They found that patients with SAHS had a higher HOMA index&#44; i&#46;e&#46; they had more insulin resistance than patients without SAHS&#46; Furthermore&#44; both obesity and the apnea&#8211;hypopnea index &#40;AHI&#41; and minimum blood oxygen saturation &#40;SaO<span class="elsevierStyleInf">2</span>&#41; were independent determinants of insulin resistance&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">The effect of SAHS on insulin resistance appears to be not only independent of obesity&#44; but also of body fat distribution and sex&#46; In 194 non-diabetic patients with SAHS&#44; the HOMA index was higher in patients with severe SAHS&#44; and was independently associated with body mass index &#40;BMI&#41;&#44; AHI and plasma adiponectin concentration&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> Similarly&#44; in a population sample of 400 women aged between 20 and 70 years&#44; Theorell-Hagl&#246;w et al&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a> showed that insulin sensitivity was lower in patients with severe SAHS&#44; associating it with minimum SaO<span class="elsevierStyleInf">2</span>&#44; when adjusting for age&#44; waist&#8211;hip ratio&#44; physical activity&#44; smoking and alcohol consumption&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The influence of SAHS on the development of insulin resistance has also been confirmed in longitudinal studies&#44; such as that conducted by Lindberg et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> which analyzed its effect on carbohydrate metabolism in a population sample of men without diabetes&#46; They found that the desaturation index&#44; AHI&#44; and minimum SaO<span class="elsevierStyleInf">2</span> were independently related with changes in the HOMA index during patient follow-up&#46; Studies have also tried to adjust for the possible influence of obesity on the SAHS&#8211;insulin resistance association&#44; evaluating it in lean individuals&#46; Pamidi et al&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a> reported that lean men with SAHS have 27&#37; lower insulin sensitivity and 37&#37; higher insulin secretion than controls matched by age&#44; BMI&#44; family history and exercise levels&#46; Similar results were found in another study in lean men conducted in China&#46;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">39</span></a> Ultimately&#44; the available evidence appears to show that SAHS is independently related with the development of insulin resistance&#44; and therefore increases the risk of diabetes&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">An intermediate step in the natural history of the SAHS-diabetes relationship is the decrease in <span class="elsevierStyleItalic">glucose tolerance</span>&#46; In fact&#44; in 150 healthy men with neither diabetes nor cardiopulmonary disease&#44; an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>5 was found to double the risk of glucose intolerance&#44; depending mainly on the severity of the nocturnal desaturation&#46;<a class="elsevierStyleCrossRef" href="#bib0200"><span class="elsevierStyleSup">40</span></a> Similarly&#44; the <span class="elsevierStyleItalic">Cleveland Family Study</span> found that the principal determinant of glucose intolerance was time with SaO<span class="elsevierStyleInf">2</span><span class="elsevierStyleHsp" style=""></span>&#60;90&#37; &#40;CT90&#41;&#44; which was present in 32&#37; of subjects with SAHS&#46; Individuals with a CT90<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>2&#37; had 2&#46;33 &#40;95&#37; CI&#58; 1&#46;38&#8211;3&#46;94&#41; times the risk of glucose intolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">41</span></a> In the <span class="elsevierStyleItalic">Sleep Heart Health Study</span>&#44; the largest epidemiological study conducted to date&#44; investigators assessed the presence of SAHS by polysomnography&#44; and measured baseline glucose and insulin levels and then again following an oral glucose tolerance test &#40;OGTT&#41;&#46; They found that once adjusted for age&#44; BMI&#44; waist circumference&#44; race&#44; sex and smoking habits&#44; subjects with an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>15 had odds ratios of 1&#46;46 and 1&#46;44 for high baseline or post-OGTT blood glucose levels&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a> More recently&#44; Cizza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">43</span></a> reported that 44&#37; of sleep-deprived obese adults had glucose intolerance&#44; and that more severe SAHS was related with higher baseline blood glucose and insulin levels&#44; and with a poorer response to the OGTT &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0050" class="elsevierStylePara elsevierViewall">Finally&#44; there is also evidence directly linking SAHS with poorer <span class="elsevierStyleItalic">metabolic glucose control</span>&#46;<a class="elsevierStyleCrossRefs" href="#bib0180"><span class="elsevierStyleSup">36&#44;44&#8211;50</span></a> In patients with no known diabetes&#44; a dose-response relationship was observed between AHI and the percentage of poor blood glucose control&#44; defined as a glycated hemoglobin level &#40;HbA1c&#41;<span class="elsevierStyleHsp" style=""></span>&#62;6&#37;&#44; which rose to 34&#46;2&#37; when the AHI was greater than 50&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a> With respect to subjects with an AHI<span class="elsevierStyleHsp" style=""></span>&#60;5&#44; the presence of an AHI of 15&#8211;30 or &#8805;50 had an adjusted odds ratio for poor blood glucose control of 1&#46;80 &#40;1&#46;19&#8211;2&#46;72&#41; and 2&#46;96 &#40;1&#46;58&#8211;5&#46;54&#41;&#44; respectively&#46; Moreover&#44; hypoxemia during sleep was also related with HbA1c<span class="elsevierStyleHsp" style=""></span>&#62;6&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">In short&#44; the data from various clinical and epidemiological studies support an association between SAHS and impaired glucose homeostasis&#44; which exposes these patients to a higher risk of developing diabetes&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Prevalence of Sleep Apnea&#8211;Hypopnea Syndrome in Patients With Type 2 Diabetes</span><p id="par0060" class="elsevierStylePara elsevierViewall">Despite notable methodological limitations&#44; several studies report a higher prevalence of SAHS in patients with DM2 than in the general population&#46;<a class="elsevierStyleCrossRefs" href="#bib0260"><span class="elsevierStyleSup">52&#8211;57</span></a> Unfortunately&#44; as yet&#44; few studies have used universally accepted diagnostic methods such as polygraphy and polysomnography&#46; The main evidence comes from various sub-analyses in a multiethnic cohort of subjects aged over 40 years with no known cardiovascular disease&#44; enrolled in the <span class="elsevierStyleItalic">Sleep Heart Health Study&#46;</span> In a sample of 4991 participants&#44; it was found that the Respiratory Disturbance Index &#40;RDI&#41; was associated with the presence of diabetes&#44; as well as age&#44; BMI&#44; waist&#8211;hip ratio&#44; hypertension and lipid levels&#46;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">58</span></a> In another series of 5874 subjects&#44; differences were noted in the RDI and the CT90 between diabetic and non-diabetic patients&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a> When the presence of SAHS was measured in the same cohort using polysomnography&#44; it was found in 58&#37; of the group of patients with DM2&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> Two subsequent studies also identified high prevalence of SAHS in patients with DM2&#58; in one&#44; up to 62&#37; of patients hospitalized for poorly controlled DM2 had SAHS &#40;34&#37; mild&#44; 19&#37; moderate and 10&#37; severe&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">55</span></a> and in the other&#44; SAHS was found in 86&#37; of obese diabetics&#46;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">56</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Prevalence of Type 2 Diabetes in Patients With Sleep Apnea&#8211;Hypopnea Syndrome</span><p id="par0065" class="elsevierStylePara elsevierViewall">The prevalence of DM2 in patients with SAHS ranges from 15&#37; to 30&#37;&#44; depending on the study population&#44; definition of severity of SAHS&#44; and the diagnostic methods used&#46;<a class="elsevierStyleCrossRefs" href="#bib0305"><span class="elsevierStyleSup">61&#44;62</span></a> The <span class="elsevierStyleItalic">Wisconsin Sleep Cohort</span> study detected a higher prevalence of DM2 in patients with SAHS &#40;14&#46;7&#37; vs 2&#46;8&#37;&#41;&#44; with an adjusted <span class="elsevierStyleItalic">odds ratio</span> of 2&#46;3 &#40;1&#46;28&#8211;4&#46;11&#41; for an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>15 with respect to an AHI<span class="elsevierStyleHsp" style=""></span>&#60;5&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">48</span></a> In contrast&#44; a multiethnic study of 1008 patients with DM2&#44; predominantly Hispanic and African-American&#44; gave negative results&#46; Although the prevalence of DM2 was also higher in subjects with SAHS than in nonapneic subjects &#40;30&#46;1&#37; vs 18&#46;6&#37;&#41;&#44; giving an <span class="elsevierStyleItalic">odds ratio</span> of 1&#46;8 &#40;1&#46;3&#8211;2&#46;6&#41;&#44; this association was not significant when controlling for various confounding factors&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">63</span></a> However&#44; another cross-sectional study conducted in a much larger sample &#40;14&#44;440 subjects in the <span class="elsevierStyleItalic">Hispanic Community Health Study&#47;Study of Latinos</span>&#41; confirmed that moderate SAHS is associated with both glucose intolerance &#40;<span class="elsevierStyleItalic">odds ratio</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;7&#59; 95&#37; CI&#58; 1&#46;3&#8211;2&#46;1&#41; and diabetes &#40;2&#46;3&#59; 1&#46;8&#8211;2&#46;9&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">64</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">In addition to the relationship between SAHS and DM2 shown in these cross-sectional studies&#44; some longitudinal studies indicate that the existence of apneas&#8211;hypopneas may lead to the development of diabetes&#46; Marshall et al&#46;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">61</span></a> provided the first evidence that moderate&#8211;severe SAHS is a risk factor for diabetes&#46; After a 4-year follow-up of an Australian population cohort&#44; they found that 20&#37; of patients with moderate&#8211;severe SAHS had been diagnosed with DM2&#44; showing that SAHS is an independent risk factor for incident diabetes &#40;adjusted hazard ratio<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>13&#46;45&#59; 95&#37; CI&#58; 1&#46;59&#8211;114&#46;11&#41;&#46; Lindberg et al&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> reported that this effect is not confined to the moderate&#8211;severe forms&#46; In an 11-year follow-up of a population sample of non-diabetic men&#44; they found that&#44; after adjusting for confounders&#44; a desaturation index<span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>5 was a predictor for the onset of diabetes &#40;4&#46;4&#59; 1&#46;1&#8211;18&#46;1&#41;&#46; Another observational study of a cohort of 1233 patients in the <span class="elsevierStyleItalic">Veteran Affairs Connecticut Health Care System</span> confirmed the role of SAHS as a risk factor for DM2&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">65</span></a> After adjusting for age&#44; sex&#44; race&#44; baseline fasting blood glucose&#44; BMI and weight change&#44; an independent association was detected between SAHS and incident diabetes &#40;1&#46;43&#59; 1&#46;10&#8211;1&#46;86&#41;&#46; A 16-year follow-up of a small cohort of middle-aged women referred to a sleep clinic also found that SAHS predicted the appearance of new-onset diabetes in females&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">62</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">The overall value of the available evidence has recently been evaluated in a meta-analysis of six prospective cohort studies with a total of 5953 participants and a follow-up period of 2&#46;7&#8211;16 years&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a> This analysis confirmed that moderate&#8211;severe SAHS is associated with a higher risk of diabetes &#40;relative risk<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;63&#59; 95&#37; CI&#58; 1&#46;09&#8211;2&#46;45&#41;&#44; when compared with the absence of SAHS &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; However&#44; patients with mild SAHS did not show a higher risk than nonapneic patients &#40;1&#46;22&#59; 0&#46;91&#8211;1&#46;63&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a></p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Pathogenic Mechanisms</span><p id="par0080" class="elsevierStylePara elsevierViewall">A better understanding of the effects of physiopathological disorders caused by apneas&#8211;hypopneas on glucose metabolism lends greater plausibility to the SAHS-DM2 relationship and can be summarized as follows&#58; SAHS activates 2 triggering mechanisms&#44; intermittent hypoxia and sleep fragmentation&#44; which induce various intermediate disorders&#44; such as activation of the sympathetic nervous system&#44; oxidative stress&#44; systemic inflammation&#44; alterations in appetite-regulating hormones and activation of the hypothalamic&#8211;pituitary&#8211;adrenal axis&#44; which in turn contribute to the development of insulin resistance&#44; progression to glucose intolerance&#44; and ultimately&#44; to DM2 &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Intermittent Hypoxia</span><p id="par0085" class="elsevierStylePara elsevierViewall">In addition to continuous hypoxia&#44;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">67&#8211;70</span></a> studies with animal models have shown that intermittent hypoxia can cause insulin resistance&#46; In lean mice&#44; exposure to successive intermittent hypoxia cycles reduced insulin sensitivity&#44; compared to exposure to synthetic air&#44; essentially due to reduced glucose utilization in oxidative muscle fibers&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">71</span></a> It appears that intermittent hypoxia only worsens glucose homeostasis during periods of hypoxic exposure&#44; and induces pancreatic &#946;-cell replication&#44; probably to compensate for diminished insulin sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">72</span></a> This compensatory response&#44; however&#44; is overridden by the presence of hyperglycemia&#44; which increases apoptosis in &#946;-cells and inhibits their replication&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">72</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">The effects of intermittent hypoxia on glucose metabolism in humans are less well known&#46; However&#44; Louis and Punjabi<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> showed&#44; in healthy volunteers subjected to intermittent hypoxia or normoxia&#44; that the former was associated with a reduction in insulin sensitivity and glucose effectiveness&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> Moreover&#44; intermittent hypoxia is accepted as one of the main determinants of HbA1c in patients with SAHS&#46; A recent study evaluated factors related with HbA1c levels in 164 patients with SAHS and normal glucose tolerance&#44; 111 with impaired tolerance&#44; and 55 with diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">74</span></a> They found that HbA1c was correlated with minimum saturation in all patients&#44; while no correlation was found with the AHI in patients with DM2 or normal blood glucose&#46; This&#44; therefore&#44; suggests that the correlation between SAHS and HbA1c in patients with DM2 is more dependent on minimum SaO<span class="elsevierStyleInf">2</span> levels than on the AHI&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">74</span></a> Similarly&#44; other authors report that the AHI is only associated with HbA1c during the REM sleep phase&#44;<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">75</span></a> which could in part explain individual variability&#46; Another possible explanation for inter-subject variation lies in alterations in hypoxia-inducible factor-1&#44; which triggers the expression of specific genes in the presence of a low oxygen levels&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">76</span></a> In diabetic rats&#44; an increase in hypoxia-inducible factor-1 expression by pancreatic &#946;-cells&#44; which inhibits glucose transport and perpetuates a state of insulin resistance&#44; has been reported&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">77</span></a></p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Sleep Fragmentation</span><p id="par0095" class="elsevierStylePara elsevierViewall">In laboratory conditions&#44; complete sleep deprivation has been found to reduce glucose tolerance&#46;<a class="elsevierStyleCrossRefs" href="#bib0230"><span class="elsevierStyleSup">46&#44;78&#8211;80</span></a> Various observational studies in the general population have also shown a relationship between sleep deprivation and altered glucose metabolism&#46; The <span class="elsevierStyleItalic">Sleep Heart Health Study</span> confirmed that less than 6<span class="elsevierStyleHsp" style=""></span>h sleep is associated with a higher prevalence of diabetes or glucose intolerance than 7&#8211;8<span class="elsevierStyleHsp" style=""></span>h of sleep&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> In addition&#44; a considerable number of longitudinal studies indicate that sleep restriction increases the risk of developing diabetes&#46; An analysis of the <span class="elsevierStyleItalic">First National Health and Nutrition Examination Survey</span> showed that fewer than 5<span class="elsevierStyleHsp" style=""></span>hours sleep resulted in a 1&#46;47-fold increase in the risk of developing diabetes during an 8&#8211;10 year follow-up&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">49</span></a> In more than 1000 men enrolled in the <span class="elsevierStyleItalic">Massachusetts Male Aging Study</span>&#44; the risk of developing diabetes in subjects reporting a shorter average sleep time was double that of those sleeping for 7&#8211;8<span class="elsevierStyleHsp" style=""></span>h&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">81</span></a> Although there is as yet little information on this aspect&#44; the effect of sleep restriction on the risk of developing diabetes appears to be sex-dependent&#46;<a class="elsevierStyleCrossRefs" href="#bib0410"><span class="elsevierStyleSup">82&#44;83</span></a> In more than 70&#44;000 non-diabetic adult women included in the <span class="elsevierStyleItalic">Nurses Health study</span>&#44; sleeping less than 5<span class="elsevierStyleHsp" style=""></span>h was found to increase the risk of developing diabetes in 10 years by 1&#46;57-fold&#44; although significance was reduced when adjusted for BMI and other confounding factors&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">47</span></a> Therefore&#44; sleep restriction appears to be an independent risk factor for diabetes&#44; primarily in men&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">In addition to studies in the general population&#44; several authors have evaluated the duration and quality of sleep in patients with diabetes&#46;<a class="elsevierStyleCrossRefs" href="#bib0420"><span class="elsevierStyleSup">84&#44;85</span></a> Most found that poor sleep quality was more prevalent in patients with diabetes&#44;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">85</span></a> and that this negatively affected blood glucose control&#46;<a class="elsevierStyleCrossRefs" href="#bib0420"><span class="elsevierStyleSup">84&#44;85</span></a> The influence of quality of sleep on glucose tolerance has also been investigated in various longitudinal series&#46;<a class="elsevierStyleCrossRefs" href="#bib0245"><span class="elsevierStyleSup">49&#44;82&#44;83&#44;86&#44;87</span></a> Apart from one study&#44;<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">83</span></a> all report an increased risk of diabetes associated with sleep disorders&#46; The potential contribution of sleep fragmentation to the SAHS&#8211;diabetes relationship is evidenced by the importance of sleepiness&#44; as demonstrated by Barcel&#243; et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">88</span></a> who found that patients with SAHS and excessive daytime sleepiness have a higher HOMA index than non-sleepy patients with SAHS or healthy controls&#46;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">88</span></a> The loss of REM sleep&#44; due to sleep fragmentation&#44; may also contribute to the development of diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">89</span></a> REM sleep has high energy requirements due to sustained neuronal activity&#44; and is accompanied by an increase in cerebral glucose uptake as well as reduced insulin and glucagon levels&#46;<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">90</span></a> Therefore&#44; the higher prevalence of diabetes in SAHS patients with a greater clustering of respiratory events during REM sleep<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">91</span></a> could be related with fragmentation of this sleep phase&#46;<a class="elsevierStyleCrossRef" href="#bib0460"><span class="elsevierStyleSup">92</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Activation of the Sympathetic Nervous System</span><p id="par0105" class="elsevierStylePara elsevierViewall">The sympathetic nervous system plays an important role in the metabolic regulation of glucose and fat&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;94</span></a> Catecholamines are known to reduce insulin sensitivity&#44; insulin-mediated glucose uptake&#44;<a class="elsevierStyleCrossRef" href="#bib0475"><span class="elsevierStyleSup">95</span></a> promote pancreatic &#946;-cell apoptosis&#44; and reduce insulin secretion&#46;<a class="elsevierStyleCrossRefs" href="#bib0480"><span class="elsevierStyleSup">96&#44;97</span></a> They can also inhibit insulin-mediated glycogenesis and increase glycolysis&#46;<a class="elsevierStyleCrossRefs" href="#bib0475"><span class="elsevierStyleSup">95&#44;96&#44;98</span></a> Increased sympathetic activity has lipolytic effects&#44; releasing circulating fatty acids&#44; which reduce insulin sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">93</span></a> Furthermore&#44; sympathetic vasoconstriction may reduce glucose and insulin supply to skeletal muscles&#44; directing the blood flow toward less metabolically active areas&#44; which reduces the net glucose uptake&#46;<a class="elsevierStyleCrossRef" href="#bib0495"><span class="elsevierStyleSup">99</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">The succession of hypoxemia-reoxygenation periods that accompany apneas&#8211;hypopneas are known to affect the sensitivity of peripheral chemoreceptors in patients with SAHS&#44;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;100</span></a> and stimulation of these receptors is known to increase sympathetic nervous system activity&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;101</span></a> Since activation of the sympathetic nervous system appears to have an impact on insulin sensitivity&#44; it has been suggested that this plays a major role in the development of insulin resistance in patients with SAHS&#46;<a class="elsevierStyleCrossRef" href="#bib0510"><span class="elsevierStyleSup">102</span></a></p><p id="par0115" class="elsevierStylePara elsevierViewall">Experimental evidence supports the suggestion that increased basal sympathetic tone plays an essential role in the SAHS-DM2 relationship&#46; Glucose intolerance caused in healthy volunteers by exposure to periods of acute hypoxia is associated with an increase in plasma catecholamines&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">70</span></a> In healthy volunteers subjected to intermittent hypoxia&#44; reduced insulin sensitivity and glucose effectiveness have been associated with a shift in the sympathovagal balance&#44; predominantly toward sympathetic nervous system activity&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> However&#44; blocking sympathetic activity in an animal model does not mitigate the short-term negative effects of intermittent hypoxia on insulin sensitivity&#44; suggesting the involvement of other alternative pathways&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">71</span></a> In any event&#44; this finding does not rule out that hypoxic activation of the sympathetic nervous system contributes to long-term progression of insulin resistance&#44; which may occur for decades in patients with SAHS&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Oxidative Stress</span><p id="par0120" class="elsevierStylePara elsevierViewall">An excess of reactive oxygen species &#40;ROS&#41; may inhibit insulin-induced energy substrate uptake in muscle and adipose tissue&#44; and may damage pancreatic &#946;-cells due to their relatively low concentration of antioxidant enzymes&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;103</span></a> Moreover&#44; the formation of ROS may suppress insulin secretion and worsen insulin sensitivity&#46;<a class="elsevierStyleCrossRefs" href="#bib0520"><span class="elsevierStyleSup">104&#44;105</span></a> In fact&#44; studies at cellular level show that intermittent hypoxia has a negative effect on &#946;-cell proliferation and death&#44; which seems to be attributable to greater cellular oxidative stress&#46;<a class="elsevierStyleCrossRef" href="#bib0530"><span class="elsevierStyleSup">106</span></a></p><p id="par0125" class="elsevierStylePara elsevierViewall">In animal models&#44; intermittent hypoxia has been shown to stimulate the release of ROS&#44; contributing to a proinflammatory state&#46;<a class="elsevierStyleCrossRef" href="#bib0535"><span class="elsevierStyleSup">107</span></a> As a result&#44; plasma cholesterol levels increase&#44; as hepatic uptake is inhibited&#44;<a class="elsevierStyleCrossRef" href="#bib0540"><span class="elsevierStyleSup">108</span></a> leading to insulin resistance&#44; increasing insulin levels and reducing glucose tolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0545"><span class="elsevierStyleSup">109</span></a> In healthy volunteers&#44; intermittent hypoxia has also been shown to increase ROS&#44;<a class="elsevierStyleCrossRef" href="#bib0550"><span class="elsevierStyleSup">110</span></a> associated with decreased insulin sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> Therefore&#44; the increase in oxidative stress seen in patients with SAHS<a class="elsevierStyleCrossRefs" href="#bib0555"><span class="elsevierStyleSup">111&#44;112</span></a> could contribute to the development of insulin resistance&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Systemic Inflammation</span><p id="par0130" class="elsevierStylePara elsevierViewall">Several lines of evidence converge to implicate sub-clinical inflammation in the pathogenesis of insulin resistance and diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">93</span></a> Diabetic patients have a baseline proinflammatory state&#44; characterized by high circulating levels of inflammatory cytokines such as interleukin-6&#44; tumor necrosis factor-&#945;&#44; C-reactive protein and interleukin-18&#46;<a class="elsevierStyleCrossRefs" href="#bib0565"><span class="elsevierStyleSup">113&#44;114</span></a> Interleukin-6 and tumor necrosis factor-&#945; in particular have been implicated in the pathogenesis of insulin resistance and DM2&#46;<a class="elsevierStyleCrossRefs" href="#bib0575"><span class="elsevierStyleSup">115&#8211;117</span></a> Similarly&#44; other studies have documented the existence of a proinflammatory state in patients with SAHS&#46;<a class="elsevierStyleCrossRefs" href="#bib0420"><span class="elsevierStyleSup">84&#44;118</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">Although the mechanism by which systemic inflammation contributes to the development of insulin resistance in SAHS is still not fully understood&#44; macrophage recruitment and the lipotoxic pathway seem especially relevant&#46; Chronic inflammation causes macrophage activation and accumulation in the pancreatic islets of patients with DM2&#44; which could contribute to tissue destruction and abnormal repair&#46;<a class="elsevierStyleCrossRefs" href="#bib0595"><span class="elsevierStyleSup">119&#44;120</span></a> The lipotoxic effects of obesity may also play an important role in the pathogenesis of insulin resistance by activating the proinflammatory pathway&#46; This is because adipocytes are a principal source of cytokines&#44; which are secreted into the circulation depending on the size of the adipocyte&#44; creating a directly proportional relationship between fat mass and circulating cytokines&#46;<a class="elsevierStyleCrossRefs" href="#bib0605"><span class="elsevierStyleSup">121&#44;122</span></a></p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Alteration in Appetite-regulating Hormones</span><p id="par0140" class="elsevierStylePara elsevierViewall">The main hormones involved in this function are leptin&#44; adiponectin and resistin&#46;<a class="elsevierStyleCrossRef" href="#bib0615"><span class="elsevierStyleSup">123</span></a> Leptin regulates hunger and weight gain at central level&#44; increasing the hypothalamic expression of anorexigenic peptides and decreasing the expression of orexigenic peptides&#44;<a class="elsevierStyleCrossRef" href="#bib0620"><span class="elsevierStyleSup">124</span></a> while at peripheral level it appears to be implicated in glucose homeostasis&#46;<a class="elsevierStyleCrossRef" href="#bib0625"><span class="elsevierStyleSup">125</span></a> Adiponectin is synthesized by the adipocytes and regulates their sensitivity to insulin&#46;<a class="elsevierStyleCrossRef" href="#bib0630"><span class="elsevierStyleSup">126</span></a> Low circulating adiponectin levels are a major risk factor for diabetes&#44; atherosclerosis and dyslipidemia&#46;<a class="elsevierStyleCrossRef" href="#bib0635"><span class="elsevierStyleSup">127</span></a> In contrast&#44; high adiponectin concentrations have protective properties against diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">93</span></a> Although the role of resistin is more uncertain&#44; it is thought to increase hepatic insulin resistance and reduce glucose tolerance&#46;<a class="elsevierStyleCrossRef" href="#bib0640"><span class="elsevierStyleSup">128</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">Some authors have reported that SAHS patients have lower plasma leptin levels than healthy subjects&#44;<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">80</span></a> although the role of obesity as a confounding factor has not always been properly controlled&#46;<a class="elsevierStyleCrossRef" href="#bib0645"><span class="elsevierStyleSup">129</span></a> This hormone appears to contribute significantly to the development of insulin resistance in SAHS&#46; In leptin-deficient obese mice&#44; intermittent hypoxia induces a decrease in blood glucose and an increase in serum insulin&#44; both in the short and long term&#44; consistent with greater insulin resistance&#46;<a class="elsevierStyleCrossRef" href="#bib0545"><span class="elsevierStyleSup">109</span></a> These responses are blocked when the animals are given a previous infusion of leptin&#44;<a class="elsevierStyleCrossRef" href="#bib0545"><span class="elsevierStyleSup">109</span></a> suggesting that the increased insulin resistance caused by the intermittent hypoxia is dependent on disruption of the leptin pathway&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">Resistin is another adipokine that may contribute to obesity&#44;<a class="elsevierStyleCrossRef" href="#bib0650"><span class="elsevierStyleSup">130</span></a> insulin resistance<a class="elsevierStyleCrossRef" href="#bib0655"><span class="elsevierStyleSup">131</span></a> and metabolic syndrome&#46;<a class="elsevierStyleCrossRef" href="#bib0660"><span class="elsevierStyleSup">132</span></a> Although some authors<a class="elsevierStyleCrossRef" href="#bib0665"><span class="elsevierStyleSup">133</span></a> found no association between plasma resistin levels in patients with SAHS and insulin resistance&#44; determined by the HOMA index&#44; other studies show that the plasma resistin concentration is higher in SAHS patients with DM2 compared to those with glucose intolerance or normal glucose metabolism&#46;<a class="elsevierStyleCrossRef" href="#bib0670"><span class="elsevierStyleSup">134</span></a></p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Activation of the Hypothalamic&#8211;Pituitary&#8211;Adrenal Axis</span><p id="par0155" class="elsevierStylePara elsevierViewall">Cortisol and other glucocorticosteroids interfere with carbohydrate metabolism by increasing glucose production&#44; decreasing glucose uptake in peripheral tissues and inhibiting the release of insulin from the pancreatic &#946;-cells&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;99</span></a></p><p id="par0160" class="elsevierStylePara elsevierViewall">Activation of the sympathetic nervous system could increase the activity of the hypothalamic&#8211;pituitary&#8211;adrenal axis&#44; increasing cortisol synthesis&#44; which leads to insulin resistance and hyperglycemia&#46;<a class="elsevierStyleCrossRef" href="#bib0675"><span class="elsevierStyleSup">135</span></a> In fact&#44; studies at altitude or under hypobaric conditions confirm that hypoxia modifies the function of the hypothalamic&#8211;pituitary&#8211;adrenal axis and increases circulating cortisol levels&#46;<a class="elsevierStyleCrossRef" href="#bib0675"><span class="elsevierStyleSup">135</span></a> Furthermore&#44; alterations in the secretion of the appetite-regulating hormones may also affect glucose homeostasis&#44; increasing nocturnal growth hormone levels and evening cortisol levels&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">46</span></a> There are few studies as yet in humans that have examined the changes in cortisol secretion induced by SAHS&#46; Although one study indicated that SAHS does not affect cortisol levels&#44;<a class="elsevierStyleCrossRef" href="#bib0680"><span class="elsevierStyleSup">136</span></a> in other cases a cortisol concentration higher than that of weight-matched controls&#44; which fell after CPAP treatment&#44; has been described&#46;<a class="elsevierStyleCrossRef" href="#bib0685"><span class="elsevierStyleSup">137</span></a></p><p id="par0165" class="elsevierStylePara elsevierViewall">In conclusion&#44; based on the current information&#44; we can establish a correlation between intermittent hypoxia and sleep fragmentation caused by SAHS and the development of insulin resistance&#44; via various pathogenic pathways&#46; Nevertheless&#44; the molecular mechanisms of cell signaling that lead to increased insulin resistance in these patients are still not sufficiently understood&#46;</p></span></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Clinical and Prognostic Relevance of the Sleep Apnea&#8211;Hypopnea Syndrome&#8211;Diabetes Association</span><p id="par0170" class="elsevierStylePara elsevierViewall">In recent years&#44; a growing body of evidence has suggested that SAHS could increase the severity of DM2&#44;<a class="elsevierStyleCrossRefs" href="#bib0690"><span class="elsevierStyleSup">138&#8211;140</span></a> but it also raises the interesting possibility of a reciprocal relationship&#46;</p><p id="par0175" class="elsevierStylePara elsevierViewall">Aronsohn et al&#46;<a class="elsevierStyleCrossRef" href="#bib0705"><span class="elsevierStyleSup">141</span></a> showed that SAHS worsens blood glucose control in DM2&#46; Compared to control subjects&#44; mean adjusted HbA1c increased by 1&#46;49&#37; in patients with mild SAHS&#44; 1&#46;93&#37; in moderate SAHS and 3&#46;69&#37; in severe SAHS &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>&#41;&#46; Furthermore&#44; other measures of SAHS severity&#44; such as the AHI and desaturation during the REM phase&#44; were also related to HbA1c levels&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0180" class="elsevierStylePara elsevierViewall">The leading cause of morbidity and mortality in patients with DM2 is the development of micro- or macrovascular complications&#44; which can also be affected by SAHS&#46; Macrovascular complications&#44; which include ischemic heart disease&#44; peripheral artery disease and cerebrovascular disease&#44; are due to the harmful effects of hyperglycemia&#44;<a class="elsevierStyleCrossRefs" href="#bib0710"><span class="elsevierStyleSup">142&#44;143</span></a> as well as atherosclerosis&#46; SAHS may also worsen certain typical microvascular complications&#44; such as retinopathy&#44; nephropathy and neuropathy&#46;<a class="elsevierStyleCrossRefs" href="#bib0690"><span class="elsevierStyleSup">138&#44;144</span></a> Various mechanisms are potentially involved in the development of microvascular complications&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> SAHS increases the production of advanced glycation end or waste products&#44;<a class="elsevierStyleCrossRef" href="#bib0730"><span class="elsevierStyleSup">146</span></a> and has been associated with an alteration in protein kinase C signaling&#44; which plays an important role in the cell response to hypoxia&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> SAHS is also associated with a decrease in endothelial nitric oxide synthase and an increase in endothelin-1 levels&#44;<a class="elsevierStyleCrossRef" href="#bib0735"><span class="elsevierStyleSup">147</span></a> with hypercoagulability<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> and inflammation&#46;<a class="elsevierStyleCrossRef" href="#bib0590"><span class="elsevierStyleSup">118</span></a> Repeated hypoxemia-reoxygenation episodes&#44; meanwhile&#44; induce ROS production&#46;<a class="elsevierStyleCrossRef" href="#bib0560"><span class="elsevierStyleSup">112</span></a> The final result of this process&#44; aggravated by the effect of hyperglycemia and hypertension&#44; is the development of endothelial dysfunction and microvascular impairment &#40;<a class="elsevierStyleCrossRef" href="#fig0025">Fig&#46; 5</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Retinopathy</span><p id="par0185" class="elsevierStylePara elsevierViewall">Despite some findings to the contrary&#44;<a class="elsevierStyleCrossRef" href="#bib0740"><span class="elsevierStyleSup">148</span></a> most studies show an association between SAHS and severity of retinopathy&#44; as well as a higher risk of progression&#46; In a cross-sectional case-control study that included 68 patients with non-proliferative diabetic retinopathy and 151 patients with proliferative diabetic retinopathy&#44; the severity of nocturnal desaturations &#40;evaluated by means of the desaturation index and the minimum SaO<span class="elsevierStyleInf">2</span>&#41; was a risk factor for proliferative diabetic retinopathy&#44; suggesting that the reoxygenation caused by the SAHS could affect retinopathy progression&#46;<a class="elsevierStyleCrossRef" href="#bib0745"><span class="elsevierStyleSup">149</span></a> In another study conducted in men with DM2&#44; SAHS was independently associated with retinopathy and diabetic maculopathy&#46;<a class="elsevierStyleCrossRef" href="#bib0695"><span class="elsevierStyleSup">139</span></a> A longitudinal study has also shown that patients with SAHS have a higher risk of developing advanced diabetic retinopathy&#46;<a class="elsevierStyleCrossRef" href="#bib0750"><span class="elsevierStyleSup">150</span></a> In a recent cross-sectional study in obese men with DM2&#44; Rudrappa et al&#46;<a class="elsevierStyleCrossRef" href="#bib0755"><span class="elsevierStyleSup">151</span></a> described worsening of retinopathy but not of maculopathy&#44; and a higher proportion of patients with proliferative diabetic retinopathy in the SAHS group&#46; Moreover&#44; SAHS was the only independent predictor of retinopathy after adjusting for new serum biomarkers of retinopathy and inflammation&#46;<a class="elsevierStyleCrossRef" href="#bib0755"><span class="elsevierStyleSup">151</span></a></p></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Nephropathy</span><p id="par0190" class="elsevierStylePara elsevierViewall">Data on this other major complication of diabetes is contradictory&#46; Schober et al&#46;<a class="elsevierStyleCrossRef" href="#bib0760"><span class="elsevierStyleSup">152</span></a> found a higher prevalence of nephropathy in adult diabetics with an AHI<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>15 than in nonapneic patients&#46; Although other authors have not identified a relationship between the presence of SAHS in patients with DM2 and the existence of microalbuminuria&#44;<a class="elsevierStyleCrossRef" href="#bib0700"><span class="elsevierStyleSup">140</span></a> in a group of patients with renal failure secondary to diabetes&#44; SAHS was associated with a higher risk of hemodialysis and hypertension&#46;<a class="elsevierStyleCrossRef" href="#bib0765"><span class="elsevierStyleSup">153</span></a></p><p id="par0195" class="elsevierStylePara elsevierViewall">In general&#44; renal ischemia and hypoxia are considered to be key factors for the development of renal failure&#46; Several studies suggest that an increase in the severity of SAHS is related with a deterioration in renal function&#44; irrespective of established risk factors for nephropathy progression&#46;<a class="elsevierStyleCrossRef" href="#bib0720"><span class="elsevierStyleSup">144</span></a> Several mechanisms have been proposed to explain this&#46; Intermittent hypoxia and sleep fragmentation caused by SAHS are known to activate the sympathetic nervous system and the renin&#8211;angiotensin&#8211;aldosterone system&#44; increase cytokine levels&#44; and contribute to oxidative stress&#46; The increased generation of free radicals gives rise to a number of harmful processes&#44; such as endothelial dysfunction&#44; inflammation&#44; platelet aggregation&#44; atherosclerosis and fibrosis&#44; which may increase the risk of renal damage in patients with SAHS&#46; Furthermore&#44; it is important to consider that SAHS is an independent risk factor of hypertension and glomerular hyperfiltration&#44; and could be an independent predictor of proteinuria&#44; a sign of renal disease and a risk factor for progression of chronic nephropathy to end-stage renal disease&#46;<a class="elsevierStyleCrossRef" href="#bib0720"><span class="elsevierStyleSup">144</span></a></p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Neuropathy</span><p id="par0200" class="elsevierStylePara elsevierViewall">Diabetic neuropathies are a heterogeneous group of disorders that affect different parts of the nervous system&#44; including generalized symmetrical polyneuropathies&#44; multifocal and focal neuropathies and autonomic neuropathy&#46; Mayer et al&#46;<a class="elsevierStyleCrossRef" href="#bib0770"><span class="elsevierStyleSup">154</span></a> showed that patients with severe SAHS have peripheral nerve dysfunction caused by axonal lesions&#44; the severity of which is partially related with nocturnal hypoxemia&#46; Raman et al&#46;<a class="elsevierStyleCrossRef" href="#bib0775"><span class="elsevierStyleSup">155</span></a> later evaluated the risk of neuropathy in 1414 patients with DM2&#44; and found that the group of diabetic women with altered sleep patterns had a higher risk of developing neuropathy&#46; However&#44; another study that only included 40 patients did not identify any association between AHI and diabetic neuropathy&#46;<a class="elsevierStyleCrossRef" href="#bib0780"><span class="elsevierStyleSup">156</span></a></p><p id="par0205" class="elsevierStylePara elsevierViewall">More recently&#44; Tahrani et al&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> showed that SAHS is independently associated with diabetic neuropathy &#40;adjusted odds ratio<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>2&#46;82&#59; 95&#37; CI&#58; 1&#46;44&#8211;5&#46;52&#41;&#46; They found that the severity of diabetic neuropathy is related with the severity of both SAHS and nocturnal hypoxemia&#44; and identified potential pathogenic mechanisms&#44; including an increase in nitrosative stress&#46;<a class="elsevierStyleCrossRef" href="#bib0725"><span class="elsevierStyleSup">145</span></a> Finally&#44; a meta-analysis confirmed the relationship between SAHS and diabetic neuropathy&#46; The presence of SAHS was more frequent in DM2 patients with neuropathy &#40;<span class="elsevierStyleItalic">odds ratio</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;95&#59; 95&#37; CI&#58; 1&#46;03&#8211;3&#46;70&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0030">Fig&#46; 6</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0785"><span class="elsevierStyleSup">157</span></a></p><elsevierMultimedia ident="fig0030"></elsevierMultimedia></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Effect of Type 2 Diabetes Mellitus on Sleep Apnea&#8211;Hypopnea Syndrome</span><p id="par0210" class="elsevierStylePara elsevierViewall">Although scant&#44; some data suggest that DM2 might worsen the progression of SAHS &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46; In animal models&#44; insulin resistance has been shown to be associated with a lower ventilatory response&#46;<a class="elsevierStyleCrossRef" href="#bib0790"><span class="elsevierStyleSup">158</span></a> Furthermore&#44; the presence of diabetic neuropathy could increase upper airway collapsibility due to impairment of the dilatory muscles of the larynx&#44; and aggravate obstructive apneas&#8211;hypopneas&#46; Indeed&#44; patients with autonomic neuropathy have more severe SAHS&#44; with longer lasting respiratory events and more desaturation than diabetics with no autonomic neuropathy&#46;<a class="elsevierStyleCrossRef" href="#bib0795"><span class="elsevierStyleSup">159</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall">Diabetes&#44; moreover&#44; may also contribute to the onset of central apneas&#46; Diabetic patients in the <span class="elsevierStyleItalic">Sleep Heart Health Study</span> had a higher incidence of periodic breathing and central apneas than non-diabetic subjects&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a> It has been suggested that diabetes-associated autonomic neuropathy alters upper airway reflex responses&#44; peripheral control of upper airway muscles&#44; mechanoreceptor activation thresholds&#44; central ventilatory stability and control&#44; and peripheral response to hypercapnia and hypoxia&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;160</span></a> Chronic hyperglycemia&#44; moreover&#44; induces oxidative stress&#44; causing nerve dysfunction and structural damage&#44;<a class="elsevierStyleCrossRef" href="#bib0805"><span class="elsevierStyleSup">161</span></a> which could worsen autonomic dysfunction and aggravate sleep disordered breathing&#44; creating a vicious circle&#46; It is precisely this relationship that explains the effect of some general interventions that are beneficial in SAHS&#46; Exercise and increased physical activity&#44; therefore&#44; which can improve blood glucose control&#44; could also have a beneficial effect on the severity of SAHS that cannot be fully explained by the associated weight loss&#46;<a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;162</span></a> Moreover&#44; some studies show that the weight loss is associated with substantial improvement in the severity of SAHS due to changes in the structure and function of the upper airways&#46;<a class="elsevierStyleCrossRefs" href="#bib0815"><span class="elsevierStyleSup">163&#44;164</span></a></p><p id="par0220" class="elsevierStylePara elsevierViewall">In conclusion&#44; there is growing evidence to associate SAHS with the development of DM2&#46; Further evidence of this is the existence of common pathogenic pathways that could have important prognostic implications&#44; not only for the progression of diabetic complications&#44; but also for a synergic effect on SAHS itself&#46;</p></span></span><span id="sec0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Funding</span><p id="par0225" class="elsevierStylePara elsevierViewall">Partially funded by the <span class="elsevierStyleGrantSponsor" id="gs0005">Spanish Society of Pulmonology and Thoracic Surgery</span> &#40;SEPAR&#41; &#40;<span class="elsevierStyleGrantNumber" refid="gs0005">034&#47;2013</span>&#41;&#44; the <span class="elsevierStyleGrantSponsor" id="gs0010">Health Research Fund</span> &#40;<span class="elsevierStyleGrantNumber" refid="gs0010">PI10&#47;00642</span> and <span class="elsevierStyleGrantNumber" refid="gs0010">PI13&#47;01512</span>&#41;&#44; the <span class="elsevierStyleGrantSponsor" id="gs0015">Ministry of Science and Education</span> &#40;<span class="elsevierStyleGrantNumber" refid="gs0015">SAF2007-62270</span>&#41; and the <span class="elsevierStyleGrantSponsor" id="gs0020">Program for R&#38;D in Biomedicine in the Madrid Region</span> &#40;<span class="elsevierStyleGrantNumber" refid="gs0020">S2010&#47;BMD-2542</span>&#41;&#46;</p></span><span id="sec0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Conflict of Interests</span><p id="par0230" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflict of interests&#46;</p></span></span>"
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          "titulo" => "Introduction"
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          "titulo" => "Clinical and Epidemiological Evidence"
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              "titulo" => "Prevalence of Sleep Apnea&#8211;Hypopnea Syndrome in Patients With Type 2 Diabetes"
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              "identificador" => "sec0020"
              "titulo" => "Prevalence of Type 2 Diabetes in Patients With Sleep Apnea&#8211;Hypopnea Syndrome"
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          "titulo" => "Pathogenic Mechanisms"
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              "titulo" => "Intermittent Hypoxia"
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              "titulo" => "Sleep Fragmentation"
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              "titulo" => "Alteration in Appetite-regulating Hormones"
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              "titulo" => "Activation of the Hypothalamic&#8211;Pituitary&#8211;Adrenal Axis"
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          "titulo" => "Clinical and Prognostic Relevance of the Sleep Apnea&#8211;Hypopnea Syndrome&#8211;Diabetes Association"
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            0 => array:2 [
              "identificador" => "sec0070"
              "titulo" => "Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Retinopathy"
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            1 => array:2 [
              "identificador" => "sec0075"
              "titulo" => "Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Nephropathy"
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              "titulo" => "Sleep Apnea&#8211;Hypopnea Syndrome and Diabetic Neuropathy"
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              "titulo" => "Effect of Type 2 Diabetes Mellitus on Sleep Apnea&#8211;Hypopnea Syndrome"
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    "fechaRecibido" => "2014-05-14"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Epidemiological data suggest that sleep apnea&#8211;hypopnea syndrome &#40;SAHS&#41; is independently associated with the development of insulin resistance and glucose intolerance&#46; Moreover&#44; despite significant methodological limitations&#44; some studies report a high prevalence of SAHS in patients with type 2 diabetes mellitus &#40;DM2&#41;&#46; A recent meta-analysis shows that moderate&#8211;severe SAHS is associated with an increased risk of DM2 &#40;relative risk<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#46;63 &#91;09&#8211;2&#46;45&#93;&#41;&#44; compared to the absence of apneas and hypopneas&#46;</p><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Common alterations in various pathogenic pathways add biological plausibility to this relationship&#46; Intermittent hypoxia and sleep fragmentation&#44; caused by successive apnea&#8211;hypopnea episodes&#44; induce several intermediate disorders&#44; such as activation of the sympathetic nervous system&#44; oxidative stress&#44; systemic inflammation&#44; alterations in appetite-regulating hormones and activation of the hypothalamic&#8211;pituitary&#8211;adrenal axis which&#44; in turn&#44; favor the development of insulin resistance&#44; its progression to glucose intolerance and&#44; ultimately&#44; to DM2&#46;</p><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Concomitant SAHS seems to increase DM2 severity&#44; since it worsens glycemic control and enhances the effects of atherosclerosis on the development of macrovascular complications&#46; Furthermore&#44; SAHS may be associated with the development of microvascular complications&#58; retinopathy&#44; nephropathy or diabetic neuropathy in particular&#46; Data are still scant&#44; but it seems that DM2 may also worsen SAHS progression&#44; by increasing the collapsibility of the upper airway and the development of central apneas and hypopneas&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Diversos datos epidemiol&#243;gicos muestran que el s&#237;ndrome de apneas-hipopneas del sue&#241;o &#40;SAHS&#41; se relaciona independientemente con el desarrollo de resistencia a la insulina e intolerancia a la glucosa&#46; Adem&#225;s&#44; y pese a la existencia de notables limitaciones metodol&#243;gicas&#44; algunos estudios refieren una elevada prevalencia de SAHS en pacientes con diabetes tipo 2 &#40;DM2&#41;&#46; Un reciente metaan&#225;lisis muestra que el SAHS moderado-grave se asocia a un mayor riesgo de DM2 &#40;riesgo relativo<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>1&#44;63 &#91;09&#8211;2&#44;45&#93;&#41;&#44; en relaci&#243;n con la ausencia de apneas-hipopneas&#46;</p><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">La existencia de alteraciones comunes de diversas v&#237;as patog&#233;nicas le proporciona plausibilidad biol&#243;gica a esta relaci&#243;n&#46; La hipoxia intermitente y la fragmentaci&#243;n del sue&#241;o&#44; originadas por la sucesi&#243;n de episodios de apneas-hipopneas&#44; inducen diversos trastornos intermedios&#44; como la activaci&#243;n del sistema nervioso simp&#225;tico&#44; el estr&#233;s oxidativo&#44; la inflamaci&#243;n sist&#233;mica&#44; alteraciones en las hormonas reguladoras del apetito y activaci&#243;n del eje hipot&#225;lamo-hip&#243;fiso-suprarrenal&#44; que favorecen el desarrollo de resistencia a la insulina&#44; as&#237; como su progresi&#243;n a intolerancia a la glucosa y&#44; en &#250;ltima instancia&#44; a DM2&#46;</p><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">La coexistencia del SAHS parece agravar la evoluci&#243;n de la DM2&#44; al empeorar el control gluc&#233;mico y potenciar el efecto de la aterosclerosis en el desarrollo de complicaciones macrovasculares&#46; Adem&#225;s&#44; el SAHS podr&#237;a asociarse al desarrollo de complicaciones microvasculares&#44; particularmente la retinopat&#237;a&#44; nefropat&#237;a o neuropat&#237;a diab&#233;ticas&#46; Aunque todav&#237;a escasos&#44; algunos datos sugieren que la DM2 tambi&#233;n podr&#237;a empeorar la evoluci&#243;n del SAHS&#44; al favorecer la colapsabilidad de la v&#237;a a&#233;rea superior y potenciar la aparici&#243;n de apneas-hipopneas centrales&#46;</p></span>"
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                      "doi" => "10.1016/j.arbres.2011.01.001"
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                  "contribucion" => array:1 [
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                      "titulo" => "Long-term cardiovascular outcomes in men with obstructive sleep apnoea&#8211;hypopnoea with or without treatment with continuous positive airway pressure&#58; an observational study"
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ISSN: 15792129
Original language: English
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