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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Background</span><p id="par0005" class="elsevierStylePara elsevierViewall">Smoking is a chronic addictive disease&#44; and it is the world&#39;s main cause of preventable death and preventable disability&#46; It is estimated that tobacco contributes to more than 8 million deaths each year worldwide&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Smoking cessation is difficult to achieve since tobacco dependence involves behavioral&#44; and cognitive phenomena such as attention&#44; reward effect and memory&#46; In fact&#44; according to different studies&#58; without help only 5&#37; of smokers remain abstinent at 6 months&#44; while medical treatment results in abstinence rates of 19&#8211;47&#37; at 6 months&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">2&#44;3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">In this context&#44; and knowing that not all smokers are the same&#44; the question arises as to whether functional brain imaging could be a helpful tool as a neurobiomarker to achieve smoking cessation on the way to personalized medicine&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Neural pathways and neuronal plasticity in nicotine dependence</span><p id="par0020" class="elsevierStylePara elsevierViewall">The brain is structurally and functionally modified by sustained exposure to nicotine&#46; When a persone smokes&#44; nicotine reaches the brain with 15<span class="elsevierStyleHsp" style=""></span>s&#44; dopaminergic neurons in the ventral tegmental area of the midbrain are activated&#44; which increases dopamine in the nucleus accumbens&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">1</span></a> The acute brain response to the arrival of nicotine activates the prefrontal cortex &#40;PFC&#41;&#44; thalamus and the vision system&#46; This fact produces a reinforcement of the behavior&#46; Eventually there are changes in the output neurons of the nucleus accumbens and prefrontal cortex after sensitization&#46; There is a remodeling of neuronal contacts and pathways&#44; which is known as neuronal plasticity after sustained exposure to nicotine&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Events that occur with acute brain damage in smokers&#44; as occurs in a stroke&#44; are an important source of information to know the nicotinic circuits involved in tobacco addiction and their operation&#44; especially if after this brain damage the patient&#39;s addiction remits&#46; A link between neuroanatomy and possible therapeutic benefit can thus be established&#46; For example&#44; the study by Naqvi et al&#46; in 2007 showed that brain lesions that damage the insula are more likely to cease nicotine addiction without relapsing&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">4</span></a> However in 2018 the discovery of the connectome&#44;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">5</span></a> a map of human brain connectivity&#44; broke with the traditional neurological approach&#44; demonstrating that in the case of addictions the relationship between lesion location and symptoms is not something so simple&#44; but requires to integrated function of multiple brain regions with specific connectivity&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Recently in the study conducted by Joutsa et al&#46; with a prospective cohort of 129 smokers suffering from focal brain damage&#44; they found that a lesion likely to lead to nicotine addiction remission would be positively connected to the dorsal cingulate and insula but negatively connected to the medial prefrontal and temporal cortex&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">6</span></a> And what is also interesting is that the connectivity profiles of lesions disrupting nicotine addiction is similar to the connectivity profile of lesions reducing the risk of alcoholism&#44; suggesting a shared network for addiction across the substances of abuse&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">6</span></a> In fact&#44; other studies have shown that tobacco and alcohol dependence have a certain mutual predictive relationship and a common biological mechanism&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">7</span></a></p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Functional brain imaging as a biomarker</span><p id="par0035" class="elsevierStylePara elsevierViewall">Functional imaging techniques allow the simultaneous measurement of functional brain activity and behavior&#44; which can be a valuable tool for understanding the brain structures and neurochemical pathways underlying craving and emotional&#44; cognitive&#44; motivational and reinforcing effects of the consumption of psychotropic substances&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a> Many functional brain imaging studies of tobacco use and dependence have been performed&#58; postitron emission tomography&#44; single photon emission computed tomography and functional magnetic resonance imaging &#40;fMRI&#41;&#46; These techniques have seen a decrease in gray matter &#40;GM&#41; volume and&#47;or density in smokers in multiple regions&#44; including the prefrontal cortex&#44; anterior cingulate&#44; thalamus&#44; temporal lobe and cerebellum&#46;<a class="elsevierStyleCrossRefs" href="#bib0115"><span class="elsevierStyleSup">8&#44;9</span></a> Previous studies revealed that thalamus participates in several cognitive brain functions&#44; including inhibitory control&#44; arousal regulation&#44; sustained attention and others&#46; Smaller thalamus volume may be related to the disruption of these cognitive function in smokers&#46; With functional brain imaging it has also been seen that patients with nicotine dependence have reduced sensitivity to natural rewards &#40;e&#46;g&#46; food&#44; water&#44; sex&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">Through fMRI good spatial resolution is achieved&#44; with also good temporal resolution and does not require the administration of radiotracers&#46; Also other studies with fMRI showed&#58; reduced functional connectivity between the nucleus accumbens and insula at baseline was associated with poor smoking cessation outcomes after a 3-week quit attempt&#44; decreased connectivity in smokers between the dorsolateral PFC and rostral anterior cingulate gyrus&#44; and also decreased connectivity betweeen the anterior insula and PFC&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">8</span></a> In the study by Qian et al&#46; they found that functional connectivity between the left dorsal medial thalamus and cerebellum is significantly decreased in the relapser group&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">9</span></a> In short&#44; participants who relapsed had reduced functional connectivity between the conscious regions controlling the desire to smoke and those related to motor control&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">As different people have differently wired brain circuits&#44; the use of functional connectivity assessments as a tool for the characterization of addiction-related circuit alterations&#44; consider this as a diagnostic tool to stratify individuals and potentially identify personalized treatments with higher probabilities of outcomes success&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Next step&#58; non-invasive brain stimulation</span><p id="par0050" class="elsevierStylePara elsevierViewall">Non-invasive brain stimulation &#40;NIBS&#41; methods such as repetitive transcranial magnetic stimulation &#40;rTMS&#41; and transcranial direct current stimulation &#40;tDCS&#41; are promising treatments for nicotine dependence&#46; These techniques have already been tried to treat other addictions such as alcoholism&#44; as well as other psychiatric illnesses like depression or obsessive-compulsive disorder&#46; In fact&#44; in 2020 the Food and Drug Administration grant marketing approval<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">10</span></a> to the Brainway deep TMS systems as an aid in short-term smoking cessation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; This approval was based on data from a randomized&#44; double blind&#44; sham controlled&#44; multi-center trial of 262 chronic smokers who had made at least one prior failed attempt to quit&#44; with the four-week continuous quit rate until week 18 was 19&#46;4&#37; following active and 8&#46;7&#37; following sham rTMS&#44; verified by urine cotinine measures&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">11</span></a></p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0055" class="elsevierStylePara elsevierViewall">NIBS can be diverse in modalities but also in stimulation parameters and montage&#46; In rTMS&#44; magnetic fields induce focal electrical currents indirectly and enable focal stimulations of the target area&#44; more frequently with high-frequency &#40;10<span class="elsevierStyleHsp" style=""></span>Hz&#41; in the PFC with cue provocation&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">12</span></a> The enhanced dorsolateral PFC activity improves executive function and cognitive control&#44; and may increase dopamine release&#44; and this can counterbalance the reward system and help patients cope with withdrawal and craving periods&#46; On the other hand&#44; tDCS involves the alteration of neuronal membrane polarization without triggering action potentials&#46; It uses an H-coil that targets deeper &#40;5&#8211;7<span class="elsevierStyleHsp" style=""></span>cm&#41; brain areas&#44; such as the bilateral PFC and insula&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">13</span></a> The adverse effects described are few&#58; headache&#44; local pain&#44; aesthenia&#44; burning sensation&#44; and as more serious cognitive disorder&#44; syncope and epilepsy&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">What appears clear in different meta-analyses of clinical trials is that multi-session protocols yielded larger effect sizes for reducing cravings and consumption than single-session protocols and that rTMS was therapeutically more effective than tDCS&#44; possibly because rTMS can target the brain regions more-precisely than tDCS can&#46;<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">14&#44;15</span></a> However&#44; nowadays it remains unclear if these techniques can be combined with medical treatment for resistant smokers or it can be an alternative for patients who cannot tolerate medication side effects&#46;<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">14&#44;15</span></a> Also if the duration of abstinence is maintained over the long term remains unclear&#46;<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">14&#44;15</span></a> Large-scale randomized controlled trials with longer follow-up are needed&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conflict of interests</span><p id="par0065" class="elsevierStylePara elsevierViewall">The authors state that they have no conflict of interests&#46;</p></span></span>"
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Editorial
Functional Brain Imaging in the Treatment of Nicotine Dependence
Violeta Esteban Rondaa,
Corresponding author
violeta_er@hotmail.com

Corresponding author.
, Esther Pastor Espláa, Carlos Rábade Castedob
a Department of Respiratory Medicine, Hospital Universitario de San Juan, Alicante, Spain
b Department of Respiratory Medicine, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Background</span><p id="par0005" class="elsevierStylePara elsevierViewall">Smoking is a chronic addictive disease&#44; and it is the world&#39;s main cause of preventable death and preventable disability&#46; It is estimated that tobacco contributes to more than 8 million deaths each year worldwide&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Smoking cessation is difficult to achieve since tobacco dependence involves behavioral&#44; and cognitive phenomena such as attention&#44; reward effect and memory&#46; In fact&#44; according to different studies&#58; without help only 5&#37; of smokers remain abstinent at 6 months&#44; while medical treatment results in abstinence rates of 19&#8211;47&#37; at 6 months&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">2&#44;3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">In this context&#44; and knowing that not all smokers are the same&#44; the question arises as to whether functional brain imaging could be a helpful tool as a neurobiomarker to achieve smoking cessation on the way to personalized medicine&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Neural pathways and neuronal plasticity in nicotine dependence</span><p id="par0020" class="elsevierStylePara elsevierViewall">The brain is structurally and functionally modified by sustained exposure to nicotine&#46; When a persone smokes&#44; nicotine reaches the brain with 15<span class="elsevierStyleHsp" style=""></span>s&#44; dopaminergic neurons in the ventral tegmental area of the midbrain are activated&#44; which increases dopamine in the nucleus accumbens&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">1</span></a> The acute brain response to the arrival of nicotine activates the prefrontal cortex &#40;PFC&#41;&#44; thalamus and the vision system&#46; This fact produces a reinforcement of the behavior&#46; Eventually there are changes in the output neurons of the nucleus accumbens and prefrontal cortex after sensitization&#46; There is a remodeling of neuronal contacts and pathways&#44; which is known as neuronal plasticity after sustained exposure to nicotine&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Events that occur with acute brain damage in smokers&#44; as occurs in a stroke&#44; are an important source of information to know the nicotinic circuits involved in tobacco addiction and their operation&#44; especially if after this brain damage the patient&#39;s addiction remits&#46; A link between neuroanatomy and possible therapeutic benefit can thus be established&#46; For example&#44; the study by Naqvi et al&#46; in 2007 showed that brain lesions that damage the insula are more likely to cease nicotine addiction without relapsing&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">4</span></a> However in 2018 the discovery of the connectome&#44;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">5</span></a> a map of human brain connectivity&#44; broke with the traditional neurological approach&#44; demonstrating that in the case of addictions the relationship between lesion location and symptoms is not something so simple&#44; but requires to integrated function of multiple brain regions with specific connectivity&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Recently in the study conducted by Joutsa et al&#46; with a prospective cohort of 129 smokers suffering from focal brain damage&#44; they found that a lesion likely to lead to nicotine addiction remission would be positively connected to the dorsal cingulate and insula but negatively connected to the medial prefrontal and temporal cortex&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">6</span></a> And what is also interesting is that the connectivity profiles of lesions disrupting nicotine addiction is similar to the connectivity profile of lesions reducing the risk of alcoholism&#44; suggesting a shared network for addiction across the substances of abuse&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">6</span></a> In fact&#44; other studies have shown that tobacco and alcohol dependence have a certain mutual predictive relationship and a common biological mechanism&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">7</span></a></p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Functional brain imaging as a biomarker</span><p id="par0035" class="elsevierStylePara elsevierViewall">Functional imaging techniques allow the simultaneous measurement of functional brain activity and behavior&#44; which can be a valuable tool for understanding the brain structures and neurochemical pathways underlying craving and emotional&#44; cognitive&#44; motivational and reinforcing effects of the consumption of psychotropic substances&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a> Many functional brain imaging studies of tobacco use and dependence have been performed&#58; postitron emission tomography&#44; single photon emission computed tomography and functional magnetic resonance imaging &#40;fMRI&#41;&#46; These techniques have seen a decrease in gray matter &#40;GM&#41; volume and&#47;or density in smokers in multiple regions&#44; including the prefrontal cortex&#44; anterior cingulate&#44; thalamus&#44; temporal lobe and cerebellum&#46;<a class="elsevierStyleCrossRefs" href="#bib0115"><span class="elsevierStyleSup">8&#44;9</span></a> Previous studies revealed that thalamus participates in several cognitive brain functions&#44; including inhibitory control&#44; arousal regulation&#44; sustained attention and others&#46; Smaller thalamus volume may be related to the disruption of these cognitive function in smokers&#46; With functional brain imaging it has also been seen that patients with nicotine dependence have reduced sensitivity to natural rewards &#40;e&#46;g&#46; food&#44; water&#44; sex&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">Through fMRI good spatial resolution is achieved&#44; with also good temporal resolution and does not require the administration of radiotracers&#46; Also other studies with fMRI showed&#58; reduced functional connectivity between the nucleus accumbens and insula at baseline was associated with poor smoking cessation outcomes after a 3-week quit attempt&#44; decreased connectivity in smokers between the dorsolateral PFC and rostral anterior cingulate gyrus&#44; and also decreased connectivity betweeen the anterior insula and PFC&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">8</span></a> In the study by Qian et al&#46; they found that functional connectivity between the left dorsal medial thalamus and cerebellum is significantly decreased in the relapser group&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">9</span></a> In short&#44; participants who relapsed had reduced functional connectivity between the conscious regions controlling the desire to smoke and those related to motor control&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">As different people have differently wired brain circuits&#44; the use of functional connectivity assessments as a tool for the characterization of addiction-related circuit alterations&#44; consider this as a diagnostic tool to stratify individuals and potentially identify personalized treatments with higher probabilities of outcomes success&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Next step&#58; non-invasive brain stimulation</span><p id="par0050" class="elsevierStylePara elsevierViewall">Non-invasive brain stimulation &#40;NIBS&#41; methods such as repetitive transcranial magnetic stimulation &#40;rTMS&#41; and transcranial direct current stimulation &#40;tDCS&#41; are promising treatments for nicotine dependence&#46; These techniques have already been tried to treat other addictions such as alcoholism&#44; as well as other psychiatric illnesses like depression or obsessive-compulsive disorder&#46; In fact&#44; in 2020 the Food and Drug Administration grant marketing approval<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">10</span></a> to the Brainway deep TMS systems as an aid in short-term smoking cessation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; This approval was based on data from a randomized&#44; double blind&#44; sham controlled&#44; multi-center trial of 262 chronic smokers who had made at least one prior failed attempt to quit&#44; with the four-week continuous quit rate until week 18 was 19&#46;4&#37; following active and 8&#46;7&#37; following sham rTMS&#44; verified by urine cotinine measures&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">11</span></a></p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0055" class="elsevierStylePara elsevierViewall">NIBS can be diverse in modalities but also in stimulation parameters and montage&#46; In rTMS&#44; magnetic fields induce focal electrical currents indirectly and enable focal stimulations of the target area&#44; more frequently with high-frequency &#40;10<span class="elsevierStyleHsp" style=""></span>Hz&#41; in the PFC with cue provocation&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">12</span></a> The enhanced dorsolateral PFC activity improves executive function and cognitive control&#44; and may increase dopamine release&#44; and this can counterbalance the reward system and help patients cope with withdrawal and craving periods&#46; On the other hand&#44; tDCS involves the alteration of neuronal membrane polarization without triggering action potentials&#46; It uses an H-coil that targets deeper &#40;5&#8211;7<span class="elsevierStyleHsp" style=""></span>cm&#41; brain areas&#44; such as the bilateral PFC and insula&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">13</span></a> The adverse effects described are few&#58; headache&#44; local pain&#44; aesthenia&#44; burning sensation&#44; and as more serious cognitive disorder&#44; syncope and epilepsy&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">What appears clear in different meta-analyses of clinical trials is that multi-session protocols yielded larger effect sizes for reducing cravings and consumption than single-session protocols and that rTMS was therapeutically more effective than tDCS&#44; possibly because rTMS can target the brain regions more-precisely than tDCS can&#46;<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">14&#44;15</span></a> However&#44; nowadays it remains unclear if these techniques can be combined with medical treatment for resistant smokers or it can be an alternative for patients who cannot tolerate medication side effects&#46;<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">14&#44;15</span></a> Also if the duration of abstinence is maintained over the long term remains unclear&#46;<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">14&#44;15</span></a> Large-scale randomized controlled trials with longer follow-up are needed&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conflict of interests</span><p id="par0065" class="elsevierStylePara elsevierViewall">The authors state that they have no conflict of interests&#46;</p></span></span>"
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