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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">El objetivo de este estudio fue valorar la respuesta ventilatoria a la estimulaci&#243;n con carb&#243;nico en pacientes con s&#237;ndrome de apneas obstructivas durante el sue&#241;o &#40;SAOS&#41; sin enfermedad pulmonar obstructiva cr&#243;nica &#40;EPOC&#41;&#44; examinando las diferencias entre enfermos hiper y normoc&#225;pnicos y comparando los resultados obtenidos con las dos t&#233;cnicas usualmente empleadas en la estimulaci&#243;n hiperc&#225;pnica &#40;<span class="elsevierStyleItalic">rebreathing</span> y estado-estable&#41;&#46; Para ello&#44; hemos estudiado a 15 pacientes obesos&#44; todos ellos con &#237;ndice de apnea-hipopnea &#40;IAH&#41; superior a 10 en el registro polisomnogr&#225;fico practicado durante una noche completa&#44; a los que realizamos las siguientes pruebas funcionales respiratorias&#58; espirometr&#237;a&#44; determinaci&#243;n de resistencias de v&#237;as a&#233;reas y vol&#250;menes est&#225;ticos pulmonares mediante pletismograf&#237;a y gasometr&#237;a arterial&#46; Posteriormente analizamos la respuesta ventilatoria mediante el m&#233;todo de estado-estable&#44; con concentraciones de CO<span class="elsevierStyleInf">2</span> progresivamente crecientes &#40;1-9&#37;&#41; y la t&#233;cnica de <span class="elsevierStyleItalic">rebreathing</span>&#46; En el grupo total de enfermos obtuvimos resultados similares mediante ambos m&#233;todos&#44; en el an&#225;lisis de&#58; &#916;VE&#47;&#916;PCO<span class="elsevierStyleInf">2</span>&#44; &#40;0&#44;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;35 frente a 0&#44;67<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;48 1&#47;min&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;59&#41;&#44; &#916;Vt&#47;&#916;PCO<span class="elsevierStyleInf">2</span> &#40;28&#44;33<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>16&#44;23 frente a 26&#44;42<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>16&#44;94 ml&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;9&#41;&#44; &#916;Vt&#47;Ti&#47;&#916;PCO<span class="elsevierStyleInf">2</span> &#40;28&#44;82<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#44;9 frente a 29&#44;41<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>23&#44;78 ml&#47;s&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;89&#41; y &#916;P0&#44; l&#47;&#916;PCO<span class="elsevierStyleInf">2</span> &#40;0&#44;11<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;07 frente a 0&#44;117<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;05 cmH<span class="elsevierStyleInf">2</span>O&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;58&#41;&#46; Comparamos los resultados obtenidos por ambas t&#233;cnicas dividiendo a nuestra poblaci&#243;n en 2 grupos de 7 y 8 pacientes respectivamente&#44; seg&#250;n el nivel de PaCO<span class="elsevierStyleInf">2</span> en vigilia fuese superior o inferior a 45 mmHg&#46; Los enfermos hiperc&#225;pnicos &#40;grupo I&#41; ten&#237;an una mayor edad &#40;61<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#44;5 frente a 50<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9 a&#241;os&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;04&#41; sin presentar diferencias en el &#237;ndice de masa corporal con respecto a los pacientes normoc&#225;pnicos &#40;grupo II&#41; &#40;37&#44;59<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6&#44;4 frente a 34&#44;56<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#44;75 kg&#47;m<span class="elsevierStyleSup">2</span>&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;33&#41;&#46; Los resultados de ambas t&#233;cnicas de estimulaci&#243;n hiperc&#225;pnica fueron similares en los miembros de un mismo grupo existiendo una disminuci&#243;n estad&#237;sticamente significativa &#40;p &#60; 0&#44;03&#41;&#44; en los sujetos con hipercapnia diurna en &#916;VE&#47;&#916;PCO<span class="elsevierStyleInf">2</span> &#916;Vt&#47;&#916;PCO<span class="elsevierStyleInf">2</span>&#44; &#916;Vt&#47;Ti&#47;&#916;PCO<span class="elsevierStyleInf">2</span> y &#916;P0&#44;1&#47;&#916;PCO<span class="elsevierStyleInf">2</span>&#46; Concluimos que no existen diferencias en los resultados obtenidos en el estudio del control de la ventilaci&#243;n con las t&#233;cnicas de <span class="elsevierStyleItalic">rebreathing</span> y estado-estable&#46; As&#237; mismo&#44; la respuesta ventilatoria a la estimulaci&#243;n con CO<span class="elsevierStyleInf">2</span> en individuos con SAOS e hipoventilaci&#243;n diurna se encuentra disminuida en comparaci&#243;n con enfermos normoc&#225;pnicos&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">The objetive of this study was to assess ventilatory response to stimulation with CO<span class="elsevierStyleInf">2</span> in patients suffering obstructive sleep apnea syndrome &#40;OSAS&#41; but without chronic obstructive pulmonary disease &#40;COPD&#41;&#44; by examining differences between hyper and normocapnic patients and comparing the results obtained with the usual techniques used to stimulate hypercapnia &#40;rebreathing and stable-state&#41;&#46; To this end&#44; we studied 15 obese patients&#44; all with an apnea-hypopnea index greater than 10 from a polysomnograph lasting a full night&#46; The following lung function tests were performed&#58; spirometry&#44; air way resistance measures and static lung volumes by plethysmograph and arterial gasometry&#46; We later analized ventilatory response by the stable-state method&#44; with increasing CO<span class="elsevierStyleInf">2</span> concentrations &#40;from 1 to 9&#37;&#41; and by the rebreathing method&#46; Results from the two methods were similar for all patients&#58; &#916;VE&#47;&#916;PCO<span class="elsevierStyleInf">2</span> &#40;0&#44;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;35 vs 0&#44;67<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;48 1&#47;min&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;59&#41;&#44; &#916;Vt&#47;&#916;PCO<span class="elsevierStyleInf">2</span>&#44; &#40;28&#44;33<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>16&#44;23 vs 26&#44;42<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>16&#44;94 ml&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;9&#41;&#44; &#916;Vt&#47;Ti&#47;&#916;PCO<span class="elsevierStyleInf">2</span>&#44; &#40;28&#44;82<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#44;9 vs 29&#44;41<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>23&#44;78 ml&#47;s&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;89&#41; y &#916;P0&#44; l&#47;&#916;PCO<span class="elsevierStyleInf">2</span> &#40;0&#44;11<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;07 vs 0&#44;117<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#44;05 cmH<span class="elsevierStyleInf">2</span>O&#47;mmHg&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>038&#41;&#46; We compared the results obtained by the two techniques by dividing the sample into two groups of 7 and 8 patients&#44; respectively&#44; depending on whether PaCO<span class="elsevierStyleInf">2</span> level before stimulation was higher or lower than 45mmHg&#46; The hypercapnic patients &#40;group <span class="elsevierStyleSmallCaps">I</span>&#41; were older &#40;61<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#44;5 vs 50<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9 years&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;04&#41; but were not different with respect to body mass freom the normocapnic patients &#40;group <span class="elsevierStyleSmallCaps">II</span>&#41; &#40;37&#44;59<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>6&#44;4 vs 34&#44;56<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#44;75 kg&#47;m<span class="elsevierStyleSup">2</span>&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;33&#41;&#46; The results from the two techniques for stimulating hypercapnia were similar within each group&#44; with a statistically significant decrease &#40;p &#60; 0&#44;03&#41; in patients with daytime hypercapnia in &#916;VE&#47;&#916;PCO<span class="elsevierStyleInf">2</span> &#916;Vt&#47;&#916;PCO<span class="elsevierStyleInf">2</span>&#44; &#916;Vt&#47;Ti&#47;&#916;PCO<span class="elsevierStyleInf">2</span> and &#916;P0&#44;1&#47;&#916;PCO<span class="elsevierStyleInf">2</span>&#46; We conclude that there are no differences in the results obtained with the rebreathing and stable state techniques&#46; Likewise&#44; ventilatory response to stimulation with CO<span class="elsevierStyleInf">2</span> in individuals with OSAS and daytime hypoventilation is less than of normocapnic patients&#46;</p></span>"
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Vol. 32. Issue 7.
Pages 341-347 (August - September 1996)
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Vol. 32. Issue 7.
Pages 341-347 (August - September 1996)
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Estimulación hipercápnica y respuesta ventilatoria en el síndrome de apnea obstructiva del sueño. Comparación de reinhalación y estado-estable
Hypercapnic stimulation and ventilatory response in obstructive sleep apnea syndrome. Comparison of rebreathing and stable techniques
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J.G. Soto Campos*, S. Cano Gómez, J. Fernández Guerra, M.A. Sánchez Armengol, F. Capote Gil, J. Castillo Gómez
Servicio de Neumología. Hospital Universitario Virgen del Rocío. Sevilla
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El objetivo de este estudio fue valorar la respuesta ventilatoria a la estimulación con carbónico en pacientes con síndrome de apneas obstructivas durante el sueño (SAOS) sin enfermedad pulmonar obstructiva crónica (EPOC), examinando las diferencias entre enfermos hiper y normocápnicos y comparando los resultados obtenidos con las dos técnicas usualmente empleadas en la estimulación hipercápnica (rebreathing y estado-estable). Para ello, hemos estudiado a 15 pacientes obesos, todos ellos con índice de apnea-hipopnea (IAH) superior a 10 en el registro polisomnográfico practicado durante una noche completa, a los que realizamos las siguientes pruebas funcionales respiratorias: espirometría, determinación de resistencias de vías aéreas y volúmenes estáticos pulmonares mediante pletismografía y gasometría arterial. Posteriormente analizamos la respuesta ventilatoria mediante el método de estado-estable, con concentraciones de CO2 progresivamente crecientes (1-9%) y la técnica de rebreathing. En el grupo total de enfermos obtuvimos resultados similares mediante ambos métodos, en el análisis de: ΔVE/ΔPCO2, (0,64±0,35 frente a 0,67±0,48 1/min/mmHg; p=0,59), ΔVt/ΔPCO2 (28,33±16,23 frente a 26,42±16,94 ml/mmHg; p=0,9), ΔVt/Ti/ΔPCO2 (28,82±20,9 frente a 29,41±23,78 ml/s/mmHg; p=0,89) y ΔP0, l/ΔPCO2 (0,11±0,07 frente a 0,117±0,05 cmH2O/mmHg; p=0,58). Comparamos los resultados obtenidos por ambas técnicas dividiendo a nuestra población en 2 grupos de 7 y 8 pacientes respectivamente, según el nivel de PaCO2 en vigilia fuese superior o inferior a 45 mmHg. Los enfermos hipercápnicos (grupo I) tenían una mayor edad (61±3,5 frente a 50±9 años; p=0,04) sin presentar diferencias en el índice de masa corporal con respecto a los pacientes normocápnicos (grupo II) (37,59±6,4 frente a 34,56±4,75 kg/m2; p=0,33). Los resultados de ambas técnicas de estimulación hipercápnica fueron similares en los miembros de un mismo grupo existiendo una disminución estadísticamente significativa (p < 0,03), en los sujetos con hipercapnia diurna en ΔVE/ΔPCO2 ΔVt/ΔPCO2, ΔVt/Ti/ΔPCO2 y ΔP0,1/ΔPCO2. Concluimos que no existen diferencias en los resultados obtenidos en el estudio del control de la ventilación con las técnicas de rebreathing y estado-estable. Así mismo, la respuesta ventilatoria a la estimulación con CO2 en individuos con SAOS e hipoventilación diurna se encuentra disminuida en comparación con enfermos normocápnicos.

Palabras clave:
Respuesta ventilatoria hipercápnica
Síndrome de apneas durante el sueño
Control de respiración
Método de reinspiraciones repetidas

The objetive of this study was to assess ventilatory response to stimulation with CO2 in patients suffering obstructive sleep apnea syndrome (OSAS) but without chronic obstructive pulmonary disease (COPD), by examining differences between hyper and normocapnic patients and comparing the results obtained with the usual techniques used to stimulate hypercapnia (rebreathing and stable-state). To this end, we studied 15 obese patients, all with an apnea-hypopnea index greater than 10 from a polysomnograph lasting a full night. The following lung function tests were performed: spirometry, air way resistance measures and static lung volumes by plethysmograph and arterial gasometry. We later analized ventilatory response by the stable-state method, with increasing CO2 concentrations (from 1 to 9%) and by the rebreathing method. Results from the two methods were similar for all patients: ΔVE/ΔPCO2 (0,64±0,35 vs 0,67±0,48 1/min/mmHg; p=0,59), ΔVt/ΔPCO2, (28,33±16,23 vs 26,42±16,94 ml/mmHg; p=0,9), ΔVt/Ti/ΔPCO2, (28,82±20,9 vs 29,41±23,78 ml/s/mmHg; p=0,89) y ΔP0, l/ΔPCO2 (0,11±0,07 vs 0,117±0,05 cmH2O/mmHg; p=038). We compared the results obtained by the two techniques by dividing the sample into two groups of 7 and 8 patients, respectively, depending on whether PaCO2 level before stimulation was higher or lower than 45mmHg. The hypercapnic patients (group I) were older (61±3,5 vs 50±9 years; p=0,04) but were not different with respect to body mass freom the normocapnic patients (group II) (37,59±6,4 vs 34,56±4,75 kg/m2; p=0,33). The results from the two techniques for stimulating hypercapnia were similar within each group, with a statistically significant decrease (p < 0,03) in patients with daytime hypercapnia in ΔVE/ΔPCO2 ΔVt/ΔPCO2, ΔVt/Ti/ΔPCO2 and ΔP0,1/ΔPCO2. We conclude that there are no differences in the results obtained with the rebreathing and stable state techniques. Likewise, ventilatory response to stimulation with CO2 in individuals with OSAS and daytime hypoventilation is less than of normocapnic patients.

Key words:
Ventilatory responses to CO2
Sleep apnea syndrome
Control of breathing
Rebreathing
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