<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0211-5735</journal-id>
<journal-title><![CDATA[Revista de la Asociación Española de Neuropsiquiatría]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Asoc. Esp. Neuropsiq.]]></abbrev-journal-title>
<issn>0211-5735</issn>
<publisher>
<publisher-name><![CDATA[Asociación Española de Neuropsiquiatría]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0211-57352013000300004</article-id>
<article-id pub-id-type="doi">10.4321/S0211-57352013000300004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Trastorno por estrés postraumático y cerebro]]></article-title>
<article-title xml:lang="en"><![CDATA[Posttraumatic stress disorder and brain]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Seijas Gómez]]></surname>
<given-names><![CDATA[Raquel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario Son Espases Servicio de Psiquiatría ]]></institution>
<addr-line><![CDATA[Palma de Mallorca ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<volume>33</volume>
<numero>119</numero>
<fpage>511</fpage>
<lpage>523</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0211-57352013000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0211-57352013000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0211-57352013000300004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En la actualidad, encontramos numerosa bibliografía sobre las alteraciones estructurales y funcionales cerebrales en el Trastorno por Estrés Postraumático (TEPT). En este trabajo se presenta una revisión bibliográfica no sistemática de los artículos publicados en los últimos años sobre la neuroanatomía y la neurofisiología del Trastorno por Estrés Postraumático. Los objetivos son: describir las hipótesis que relacionan las alteraciones neuroanatómicas y la sintomatología característica del TEPT; y describir el perfil neuropsicológico y los tratamientos con base en las neurociencias, partiendo de la premisa de que las limitaciones metodológicas de los estudios no permiten generalizar estos resultados. Finalmente se propone que la rehabilitación neuropsicológica de los déficits cognitivos mostrados por estos pacientes potenciaría la eficacia de los tratamientos psicológicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Currently, we have enough literature about brain findings in post-traumatic stress disorder (PTSD). A bibliographical review of the articles published in the last years related to neuroanatomy and neurophysiology of Posttraumatic Stress Disorder is presented. The aims of this review are: to describe the hypotheses that relate the neuroanatomics disorders and the typical symptomatology of the TEPT, and to describe the neuropsychological profile and the treatments based in Neuroscience, taking into account that the methodological limitations of the studies do not allow to generalize these results. Finally, we raise the rehabilitation of the neuropsychological cognitive deficits shown by these patients, with a view to enhancing the effectiveness of psychological treatments.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Neuropsicología]]></kwd>
<kwd lng="es"><![CDATA[Trastornos por Estrés Postraumático]]></kwd>
<kwd lng="es"><![CDATA[Trastornos de la Memoria]]></kwd>
<kwd lng="en"><![CDATA[Neuropsychology]]></kwd>
<kwd lng="en"><![CDATA[Stress Disorders]]></kwd>
<kwd lng="en"><![CDATA[Post-Traumatic]]></kwd>
<kwd lng="en"><![CDATA[Memory Disorders]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><a name="top"></a></p>     <p><font face="Verdana" size="2"><b>ORIGINALES Y REVISIONES</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><b>Trastorno por estr&eacute;s postraum&aacute;tico y cerebro</b></font></p>     <p><font face="Verdana" size="4"><b>Posttraumatic stress disorder and brain</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Raquel Seijas G&oacute;mez</b></font></p>     <p><font face="Verdana" size="2">Psic&oacute;loga Interna Residente. Hospital Universitario Son Espases. Servicio de Psiquiatr&iacute;a, Palma de Mallorca, Espa&ntilde;a</font></p>     <p><font face="Verdana" size="2"><a href="#bajo">Dirección para correspondencia</a></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2">En la actualidad, encontramos numerosa bibliograf&iacute;a sobre las alteraciones estructurales y funcionales cerebrales en el Trastorno por Estr&eacute;s Postraum&aacute;tico (TEPT). En este trabajo se presenta una revisi&oacute;n bibliogr&aacute;fica no sistem&aacute;tica de los art&iacute;culos publicados en los &uacute;ltimos a&ntilde;os sobre la neuroanatom&iacute;a y la neurofisiolog&iacute;a del Trastorno por Estr&eacute;s Postraum&aacute;tico. Los objetivos son: describir las hip&oacute;tesis que relacionan las alteraciones neuroanat&oacute;micas y la sintomatolog&iacute;a caracter&iacute;stica del TEPT; y describir el perfil neuropsicol&oacute;gico y los tratamientos con base en las neurociencias, partiendo de la premisa de que las limitaciones metodol&oacute;gicas de los estudios no permiten generalizar estos resultados. Finalmente se propone que la rehabilitaci&oacute;n neuropsicol&oacute;gica de los d&eacute;ficits cognitivos mostrados por estos pacientes potenciar&iacute;a la eficacia de los tratamientos psicol&oacute;gicos.</font></p>     <p><font face="Verdana" size="2"><b>Palabras clave:</b> Neuropsicolog&iacute;a. Trastornos por Estr&eacute;s Postraum&aacute;tico. Trastornos de la Memoria.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><b>ABSTRACT</b></font></p>     <p><font face="Verdana" size="2">Currently, we have enough literature about brain findings in post-traumatic stress disorder (PTSD). A bibliographical review of the articles published in the last years related to neuroanatomy and neurophysiology of Posttraumatic Stress Disorder is presented. The aims of this review are: to describe the hypotheses that relate the neuroanatomics disorders and the typical symptomatology of the TEPT, and to describe the neuropsychological profile and the treatments based in Neuroscience, taking into account that the methodological limitations of the studies do not allow to generalize these results. Finally, we raise the rehabilitation of the neuropsychological cognitive deficits shown by these patients, with a view to enhancing the effectiveness of psychological treatments.</font></p>     <p><font face="Verdana" size="2"><b>Key words:</b> Neuropsychology. Stress Disorders, Post-Traumatic. Memory Disorders.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Introducci&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Desde su inclusi&oacute;n en el DSM-III, se han abordado tanto los aspectos neuroanat&oacute;micos, como el tratamiento psicol&oacute;gico y farmacol&oacute;gico del Trastorno por Estr&eacute;s postraum&aacute;tico (en adelante TEPT). Frente al estudio inicial del condicionamiento del miedo en animales (1); en las &uacute;ltimas d&eacute;cadas se han empleado muestras de poblaci&oacute;n militar y civil expuesta a acontecimientos traum&aacute;ticos con agente causal humano (atentados, v&iacute;ctimas de agresiones sexuales, violencia machista, accidentes automovil&iacute;sticos, entre otros). En estos estudios se encuentran alteraciones anat&oacute;micas y funcionales en el hipocampo, la am&iacute;gdala, y el c&oacute;rtex prefrontal, principalmente. El objetivo de esta revisi&oacute;n es presentar los hallazgos actuales a nivel neurobiol&oacute;gico y neuropsicol&oacute;gico, que puedan estar relacionados con los d&eacute;ficits cognitivos y la sintomatologia caracter&iacute;stica del TEPT. Se plantea tambi&eacute;n un posible abordaje neuropsicol&oacute;gico de esta patolog&iacute;a.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>M&eacute;todo</b></font></p>     <p><font face="Verdana" size="2">Se ha realizado una b&uacute;squeda de art&iacute;culos en bases de datos (PubMed, PschyInfo), y plataformas bibliogr&aacute;ficas (EbscoHost, SCience Direct). Los t&eacute;rminos empleados han sido los siguientes: brain injury, trauma, memory, amnesia; comorbidity of PTSD, PTSD and brain, PTSD and prefrontal cortex, EMDR and brain, EMDR and posttraumatic stress. La mayor parte de los estudios incluidos han sido publicados en los &uacute;ltimos diez a&ntilde;os y emplean muestras de poblaci&oacute;n adulta.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Evidencias actuales sobre las bases cerebrales del TEPT</b></font></p>     <p><font face="Verdana" size="2">La mayor&iacute;a de los estudios que tratan de determinar los correlatos cerebrales del TEPT describen agentes causales humanos, y emplean muestras de militares, v&iacute;ctimas de accidentes de tr&aacute;fico, de agresiones sexuales, o poblaci&oacute;n infantil con antecedentes de alg&uacute;n tipo de maltrato f&iacute;sico o psicol&oacute;gico. En relaci&oacute;n a la repercusi&oacute;n que el maltrato infantil pueda tener en la estructura y funcionamiento cerebral, y en el desarrollo posterior de TEPT, Bonne et al (2008) encuentran una reducci&oacute;n de las zonas posteriores del hipocampo, tanto en sujetos con antecedentes traum&aacute;ticos en la infancia como en otros que sit&uacute;an el estresor en la etapa adulta (2). Daniels, Frewen, McKinnon y Lanius (2011) plantean un modelo sobre la influencia del maltrato infantil en la fisiopatolog&iacute;a cerebral y las repercusiones de &eacute;sta en el desarrollo emocional. Seg&uacute;n estos autores, la disfuncionalidad en el eje Hipot&aacute;lamo-Hipofisario-Adrenal<sup><a href="#n">1</a></sup>, (HPA en adelante) afectar&aacute; al sistema atencional promoviendo un estado de hipervigilancia y respuesta incrementada ante est&iacute;mulos neutros, adem&aacute;s de problemas en la regulaci&oacute;n emocional, la autoconciencia y la empat&iacute;a (3). Otros autores afirman que el menor umbral de reactividad y la facilidad para condicionar respuestas de miedo depende de la mayor actividad noradren&eacute;rgica, la hiperactividad del sistema opi&aacute;ceo end&oacute;geno y permite distinguir entre poblaci&oacute;n cl&iacute;nica y no cl&iacute;nica (4). A nivel neuronal, el estr&eacute;s prolongado interfiere en el aprendizaje (concretamente en el fen&oacute;meno de potenciaci&oacute;n a largo plazo) y en la neurog&eacute;nesis (5).</font></p>     <p><font face="Verdana" size="2">Las estructuras l&iacute;mbicas m&aacute;s relacionadas con la sintomatolog&iacute;a postraum&aacute;tica son el hipocampo y la am&iacute;gdala. Hay que destacar que no es posible establecer una relaci&oacute;n causal entre la afectaci&oacute;n en estas estructuras y la sintomatolog&iacute;a de TEPT. Respecto al hipocampo, los estudios de neuroimagen encuentran una reducci&oacute;n en su volumen, que afecta principalmente a la secci&oacute;n CA3, CA1, al giro dentado y a zonas posteriores; y algunos autores encuentran diferencias interhemisf&eacute;ricas en la magnitud de la reducci&oacute;n volum&eacute;trica (6-7). Hay que destacar que no todos los estudios corroboran estos hallazgos, es decir, la reducci&oacute;n volum&eacute;trica aparec&iacute;a incluso en poblaci&oacute;n no cl&iacute;nica, en poblaci&oacute;n cl&iacute;nica era directamente proporcional al nivel de gravedad del TEPT, y s&oacute;lo se hac&iacute;a evidente en la edad adulta, y no en poblaci&oacute;n infantil (8). Las diferencias entre adultos y ni&ntilde;os podr&iacute;an explicarse, entre otros aspectos metodol&oacute;gicos, por el proceso de neurodesarrollo.</font></p>     <p><font face="Verdana" size="2">Sin embargo, los resultados de los estudios pueden resultar poco claros si consideramos que el nivel de inteligencia previa puede incidir en el volumen del hipocampo, e incluso podr&iacute;a servir para establecer el perfil de habilidades cognitivas de un sujeto: tradicionalmente se ha relacionado el hipocampo izquierdo con una mayor capacidad verbal y el derecho con una mayor capacidad manipulativa (9). Woon y Dawson (2009) destacan el efecto protector que tendr&iacute;a la reserva cognitiva en la menor sintomatolog&iacute;a TEPT. Otras variables muestrales que pueden estar contaminando los resultados son la medicaci&oacute;n psicotr&oacute;pica, el sexo y la influencia hormonal femenina. En relaci&oacute;n a esta &uacute;ltima, y a pesar de la mayor prevalencia del TEPT en las mujeres, no se encuentran diferencias significativas entre sexos en el tama&ntilde;o del hipocampo adem&aacute;s de, parad&oacute;jicamente, una mayor proporci&oacute;n de hormona del crecimiento y menor reducci&oacute;n asociada a la edad en la muestra femenina (10).</font></p>     <p><font face="Verdana" size="2">Un reciente metaan&aacute;lisis sobre la relaci&oacute;n entre la am&iacute;gdala y el TEPT (9), no encuentra diferencias significativas entre poblaci&oacute;n cl&iacute;nica y no cl&iacute;nica, sin embargo, refiere en ambos grupos un mayor volumen en la am&iacute;gdala derecha. Otros estudios que emplean una muestra infantil, tambi&eacute;n descartan diferencias significativas en el tama&ntilde;o amigdalar (11).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">A nivel cortical, el TEPT cr&oacute;nico correlaciona con una reducci&oacute;n en la sustancia gris prefrontal dorsolateral, parietal y en el c&oacute;rtex cingulado. La duraci&oacute;n del trastorno es directamente proporcional a la reducci&oacute;n de sustancia gris y a la gravedad sintomatol&oacute;gica (12).</font></p>     <p><font face="Verdana" size="2">En los &uacute;ltimos a&ntilde;os se han empleado modernas t&eacute;cnicas funcionales que permiten la objetivaci&oacute;n de lesiones inapreciables con los m&eacute;todos tradicionales, como la tomograf&iacute;a por emisi&oacute;n de positrones y la resonancia magn&eacute;tica funcional (13). Se han descrito alteraciones en actividad de la am&iacute;gdala, el c&oacute;rtex cingulado anterior, el hipot&aacute;lamo y el circuito HHA (14-16). Koenings (2008) y su grupo de trabajo han hallado que el da&ntilde;o en el c&oacute;rtex prefrontal ventromedial disminuye la sintomatologia TEPT aunque la am&iacute;gdala permaneciese hiperactivada, de forma contraria a lo esperable si tenemos en cuenta que el c&oacute;rtex prefrontal tiene un papel inhibitorio de la am&iacute;gdala. Los autores concluyen que la remisi&oacute;n sintomatol&oacute;gica m&aacute;s significativa aparec&iacute;a ante la reducci&oacute;n de la activaci&oacute;n en ambas zonas (17).</font></p>     <p><font face="Verdana" size="2">Otro hallazgo funcional es que la hiperactivaci&oacute;n del estriado y del c&oacute;rtex somatosensorial; y la hipoactivaci&oacute;n simult&aacute;nea del c&oacute;rtex prefrontal orbitofrontal derecho, correlacionaban con d&eacute;ficits de inhibici&oacute;n de respuesta en tareas motoras (empleo del paradigma Go-No go), y una mayor lateralizaci&oacute;n derecha en la inhibici&oacute;n motora (18). Morey et al (2009) refieren que la hiperactivaci&oacute;n motora tiene un efecto negativo sobre la memoria de trabajo, y que la mayor activaci&oacute;n de zonas ventrales (am&iacute;gdala, c&oacute;rtex prefrontal ventromedial) ante est&iacute;mulos emocionales genera dificultades para inhibir la interferencia (tanto ante est&iacute;mulos distractores emocionales como aquellos neutros) y activa en menor medida las estructuras cerebrales relacionadas con la memoria de trabajo como el c&oacute;rtex prefrontal dorso-lateral y el parietal posterior (19).</font></p>     <p><font face="Verdana" size="2">Tal y como se ha comentado m&aacute;s arriba, no es posible establecer una relaci&oacute;n causal entre alteraci&oacute;n cerebral y sintomatolog&iacute;a; por lo cual, es posible que las alteraciones estructurales sean previas al desarrollo del TEPT y constituyan un factor se riesgo para el mismo (20). Son varias las hip&oacute;tesis que se han establecido en relaci&oacute;n a los factores que puedan predisponer al TEPT. Algunos autores describen la vulnerabilidad gen&eacute;tica e implican principalmente a los genes reguladores de la producci&oacute;n de dopamina, serotonina, GABA, noradrenalina y las prote&iacute;nas CREB, entre otros (21-22). Otro par&aacute;metro relacionado es el registro electroencefalogr&aacute;fico anormal en c&oacute;rtex cingulado anterior, t&aacute;lamo y c&oacute;rtex prefrontal ventromedial, previo al desarrollo del trastorno y que incluso permanecer&iacute;a alterado tras la recuperaci&oacute;n temporal del episodio traum&aacute;tico (23).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>TEPT, Memoria y otras funciones cognitivas</b></font></p>     <p><font face="Verdana" size="2">Los estudios analizados son inconsistentes respecto al perfil de rendimiento neuropsicol&oacute;gico en el TEPT. As&iacute;, la comorbilidad psiqui&aacute;trica (principalmente con otros trastornos de ansiedad) y el nivel de inteligencia prem&oacute;rbido influyen en el rendimiento en las pruebas y pueden contaminar los resultados.</font></p>     <p><font face="Verdana" size="2">Eren-Kooak et al (2009) estudian por primera vez las funciones cognitivas en poblaci&oacute;n cl&iacute;nica diagnosticada de TEPT tras una cat&aacute;strofe natural, y describen afectaci&oacute;n en los procesos de monitorizaci&oacute;n y organizaci&oacute;n del material presen tado en la prueba, tanto en el grupo de TEPT resuelto como en los que todav&iacute;a segu&iacute;an cumpliendo los criterios para el trastorno (24). Al contrario de otros trabajos (9), en su muestra, el nivel educativo y el CI previo no son definidos como factores protectores, sino como moduladores de la permanencia del TEPT, promoviendo una recuperaci&oacute;n m&aacute;s temprana. Otra funci&oacute;n cognitiva afectada en el TEPT es la atenci&oacute;n. En los sujetos con TEPT demorado y secundario a lesi&oacute;n org&aacute;nica est&aacute;n comprometidas la atenci&oacute;n sostenida y alternante, adem&aacute;s de presentar fallos de memoria (25). Schweizer y Dalgleish (2011) tambi&eacute;n describen alteraciones en atenci&oacute;n focalizada y en la sostenida cuando emplean est&iacute;mulos con contenido emocional (26). Aupperle, Melrose, Stein y Paulus (2008) describen fallos en el control inhibitorio (27), que se reducen tras el tratamiento psicol&oacute;gico bajo enfoque cognitivo-conductual (28).</font></p>     <p><font face="Verdana" size="2">La afectaci&oacute;n mn&eacute;sica es la m&aacute;s citada por los autores. Pr&aacute;cticamente todos los estudios sobre TEPT y alteraciones de memoria describen la influencia del c&oacute;rtex prefrontal dorsolateral en la recuperaci&oacute;n de episodios relacionados con el trauma (flashbacks) (29). La corteza frontal se ha relacionado con los juicios de recencia, la frecuencia del material presentado, el aprendizaje asociativo, la metamemoria, la organizaci&oacute;n del material a recordar (empleo de estrategias de procesamiento profundo), y la memoria de la fuente; aspectos implicados en las memorias traum&aacute;ticas (30). Blumenfeld et al (2007) encuentran en poblaci&oacute;n no cl&iacute;nica una mayor especializaci&oacute;n hemisf&eacute;rica en la recuperaci&oacute;n voluntaria (c&oacute;rtex derecho) e involuntaria (c&oacute;rtex izquierdo) de memorias epis&oacute;dicas (21). Sin embargo, en sujetos diagnosticados de TEPT, se ha hallado un patr&oacute;n de activaci&oacute;n contrario. El recuerdo de un evento traum&aacute;tico, en respuesta, por ejemplo, a un estresor percibido, est&aacute; relacionado con la desinhibici&oacute;n del c&oacute;rtex paral&iacute;mbico, las &aacute;reas sensoriales primarias y estructuras subcorticales (como la am&iacute;gdala y el hipocampo), simult&aacute;nea a una hipofuncionalidad frontal (inactivaci&oacute;n del c&oacute;rtex prefrontal dorsolateral) (31). Este modelo de organizaci&oacute;n de las memorias autobiogr&aacute;ficas fue planteado por Conway (2000) y replicado por otros autores, que encuentran que los pacientes con da&ntilde;o cerebral de gravedad moderada a severa mostraban una deficiente selecci&oacute;n y actualizaci&oacute;n en la recuperaci&oacute;n tanto de detalles espec&iacute;ficos, o memoria epis&oacute;dica, como de eventos generales o conocimiento sem&aacute;ntico (32-33). Berthier, Kulisevsky, Fern&aacute;ndez Benitez y Gironell (1998) tambi&eacute;n encuentran un patr&oacute;n de respuesta similar en sujetos con da&ntilde;o cerebral adquirido tras accidentes de tr&aacute;fico (25). En referencia al momento de aparici&oacute;n de las memorias traum&aacute;ticas y su relaci&oacute;n con la alteraci&oacute;n en los circuitos cerebrales, se plantea que &uacute;nicamente tienen lugar tras la exposici&oacute;n a alg&uacute;n est&iacute;mulo relacionado, y no puede darse de forma espont&aacute;nea (34-35); mientras que otros autores afirman que es posible posponer la aparici&oacute;n de dichos s&iacute;ntomas (TEPT demorado) a pesar de estar expuestos a eventos que puedan actuar como disparadores, debido al papel oxidativo del estr&eacute;s sobre las estructuras cerebrales implicadas (36).</font></p>     <p><font face="Verdana" size="2">Desde una perspectiva del procesamiento de la informaci&oacute;n, las memorias traum&aacute;ticas o flashbacks son el resultado de la integraci&oacute;n y contextualizaci&oacute;n ineficaz de episodios en la memoria sem&aacute;ntica (37-38). Las memorias de acontecimientos traum&aacute;ticos tienen las siguientes caracter&iacute;sticas: son persistentes en el tiempo (39), sin descartarse la posibilidad de que var&iacute;en su contenido (40), tienen un car&aacute;cter premonitorio y no son una reproducci&oacute;n exacta del acontecimiento (36), son inexactas (hay una p&eacute;rdida de informaci&oacute;n, al igual que sucede con los acontecimientos no estresantes (34), son desorganizadas (41), tienen car&aacute;cter de viveza (consecuente a una mayor activaci&oacute;n fisiol&oacute;gica), y est&aacute;n elicitadas mayoritariamente ante est&iacute;mulos visuales. La caracter&iacute;stica de desestructuraci&oacute;n en su contenido ha sido descrita como un factor pron&oacute;stico del TEPT (34), algunos autores encuentran que esta desestructuraci&oacute;n persiste tras el tratamiento psicol&oacute;gico (42). Tambi&eacute;n la sensaci&oacute;n de realidad, las interpretaciones negativas sobre los recuerdos y la supresi&oacute;n voluntaria de pensamientos referidos a los flashbacks son factores predictores del curso del TEPT (43).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Tal y como se ha se&ntilde;alado m&aacute;s arriba, algunos autores han llegado a defender la posibilidad de diagnosticar TEPT en sujetos que han sufrido amnesia postraum&aacute;tica, opini&oacute;n que no es compartida por todos los autores. Berthier et al (1998) describen dos casos en los que los criterios diagn&oacute;sticos de TEPT s&oacute;lo llegan a cumplirse tras un da&ntilde;o cerebral traum&aacute;tico que ocurri&oacute; varios meses despu&eacute;s del acontecimiento traum&aacute;tico, mientras que en el per&iacute;odo previo los sujetos ten&iacute;an una amnesia completa del evento desagradable. Los autores plantean que esta recuperaci&oacute;n a posteriori ser&iacute;a resultado de la desinhibici&oacute;n de las memorias traum&aacute;ticas, y otorgan al hemisferio derecho (zonas l&iacute;mbicas, paral&iacute;mbicas y visuales) un mayor protagonismo en dicha recuperaci&oacute;n (25). En defensa de la comorbilidad entre TEPT y amnesia pos-traum&aacute;tica, se encuentra que los sujetos que presentan estos dos cuadros tienen una sintomatolog&iacute;a particular (por ejemplo presentan menos s&iacute;ntomas disociativos y de reexperimentaci&oacute;n) y podr&iacute;an llegar a constituir una nueva clase de TEPT (44-45).</font></p>     <p><font face="Verdana" size="2">Al contrario, otros autores califican a la amnesia postraum&aacute;tica como un factor protector para desarrollar un TEPT; pero en sus estudios, la variable tiempo no confirma esta idea y encuentran que la vulnerabilidad a desarrollar el trastorno es mayor a medida que transcurre m&aacute;s tiempo desde el acontecimiento traum&aacute;tico (11, 46). Seg&uacute;n Gil, Zilberman, Koren y Klein (2005), la recuperaci&oacute;n voluntaria del evento traum&aacute;tico en las 24 horas siguientes a &eacute;ste ser&iacute;a un factor de riesgo para el desarrollo del TEPT a largo plazo (47); hip&oacute;tesis no apoyada por otros autores, que defienden que la reexperimentaci&oacute;n (de car&aacute;cter involuntario) es el s&iacute;ntoma m&aacute;s predictivo del desarrollo de TEPT (48). El llamado S&iacute;ndrome Posconmocional es otro ejemplo de controversia sobre la etiolog&iacute;a org&aacute;nica vs funcional y la incompatibilidad de diagn&oacute;sticos, y algunos de los s&iacute;ntomas propuestos para este cuadro son propios a los observados tambi&eacute;n en el TEPT (49-56).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>TEPT, Sue&ntilde;o REM y EMDR</b></font></p>     <p><font face="Verdana" size="2">En los sujetos con TEPT se han observado las siguientes alteraciones en la fase REM del sue&ntilde;o: una mayor latencia de entrada en esta fase, menor sue&ntilde;o total y fragmentaci&oacute;n de la misma, mayor cantidad de movimientos oculares r&aacute;pidos, ausencia de catatonia e incremento del tono muscular. Tambi&eacute;n se ha observado un incremento de la activaci&oacute;n cortical (metabolitos de NA) e incremento de la tasa card&iacute;aca, alteraciones en los patrones de respiraci&oacute;n, pesadillas y terrores nocturnos. Tanto el insomnio como las alteraciones espec&iacute;ficas en la fase REM se han considerado factores de riesgo y mantenedores al del TEPT (43, 57-59).</font></p>     <p><font face="Verdana" size="2">Algunos autores explican la presencia de las memorias intrusivas en base a la mayor activaci&oacute;n o saliencia durante su codificaci&oacute;n en la fase REM del sue&ntilde;o. Durante el sue&ntilde;o se produce la integraci&oacute;n y consolidaci&oacute;n de las memorias, mediante el intercambio de informaci&oacute;n entre el hipocampo y el c&oacute;rtex cerebral (60). De esta forma, los conocimientos epis&oacute;dicos se trasladan desde el hipocampo al c&oacute;rtex prefrontal, una vez que se ha extra&iacute;do su significado y se ha integrado en una de las m&uacute;ltiples redes de conocimiento. Algunos autores han comprobado que los sujetos con TEPT presentan ciertas anormalidades en los patrones electrofisiol&oacute;gicos que relacionan con la falta de integraci&oacute;n de las memorias durante esta fase del sue&ntilde;o (55). Los movimientos oculares r&aacute;pidos de la fase REM, y la activaci&oacute;n amigdalina conjunta, se han relacionado con la formaci&oacute;n y consolidaci&oacute;n de las memorias emocionales, frente al sue&ntilde;o no REM, m&aacute;s implicado en la consolidaci&oacute;n de memorias expl&iacute;citas o declarativas (61).</font></p>     <p><font face="Verdana" size="2">En base al protagonismo dado al sue&ntilde;o REM en la consolidaci&oacute;n y recuperaci&oacute;n de las memorias traum&aacute;ticas, en la d&eacute;cada de los 80 se comenz&oacute; a estudiar la importancia del sue&ntilde;o REM y, concretamente, de algunas de sus caracter&iacute;sticas, en el dise&ntilde;o de tratamientos para el TEPT. Desde su descubrimiento por F. Shapiro (62), la terapia EMDR (o de desensibilizaci&oacute;n y reprocesamiento mediante movimientos oculares) ha demostrado ser eficaz para el tratamiento, entre otros trastornos, del TEPT (63-64); y algunos autores han descrito su eficacia de su aplicaci&oacute;n tras una &uacute;nica sesi&oacute;n (65). El reducido volumen de la sustancia gris en la corteza cingulada, parahipocampal e insular, que correlaciona con algunos de los s&iacute;ntomas del TEPT, se ha relacionado con la mayor efectividad de esta t&eacute;cnica (66). Hasta la actualidad no existe un acuerdo sobre qu&eacute; mecanismos o aspectos de la t&eacute;cnica EMDR son los realmente eficaces; pero una de las hip&oacute;tesis m&aacute;s respaldadas es la que defiende que la producci&oacute;n de los cambios fisiol&oacute;gicos que se producen durante el suelo REM (alterados en los sujetos con TEPT), y que se replican al aplicar la t&eacute;cnica, podr&iacute;a ser el factor que explique su eficacia (64, 67). El empleo de movimientos oculares bilaterales, como del tapping o golpeteo, act&uacute;an sobre la conectividad interhemisf&eacute;rica, y disminuyen el nivel de actividad cerebral (refleja do en el paso a ondas gamma), facilit&aacute;ndose de esta forma la recuperaci&oacute;n y consolidaci&oacute;n de las memorias autobiogr&aacute;ficas (68). En conclusi&oacute;n, se puede decir que los componentes de exposici&oacute;n voluntaria ante el episodio traum&aacute;tico, facilitada por los movimientos bilaterales que reducen el impacto emocional de la exposici&oacute;n (36, 69), la desensibilizaci&oacute;n resultado de esta exposici&oacute;n prolongada, la toma de conciencia corporal, la reinterpretaci&oacute;n e integraci&oacute;n del evento traum&aacute;tico; y los cambios que se producen a nivel cerebral pueden estar detr&aacute;s de la efectividad de esta t&eacute;cnica. Adem&aacute;s de los tratamientos eficaces para el TEPT (70-71), la eficacia del EMDR es superior a otras t&eacute;cnicas como las corporales (72) o la estimulaci&oacute;n magn&eacute;tica transcraneal. (73).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Discusi&oacute;n</b></font></p>     <p><font face="Verdana" size="2">En este trabajo se han descrito los hallazgos neuroanat&oacute;micos y neurofisiol&oacute;gicos en el TEPT, y la relaci&oacute;n entre &eacute;ste, el sue&ntilde;o y el da&ntilde;o cerebral. Teniendo en cuenta la imposibilidad de establecer una relaci&oacute;n causal entre la sintomatolog&iacute;a del TEPT y las alteraciones cerebrales, junto a las limitaciones metodol&oacute;gicas que no permiten generalizar las observaciones; la afectaci&oacute;n neuropsicol&oacute;gica de los pacientes con TEPT comprende: un d&eacute;ficit ejecutivo en el control de la informaci&oacute;n procesada (recuperaci&oacute;n involuntaria de im&aacute;genes del trauma), y en la focalizaci&oacute;n y el mantenimiento atencional sobre est&iacute;mulos relacionados con el evento traum&aacute;tico (que podr&iacute;a responder a la conductas de evitaci&oacute;n caracter&iacute;sticas). A nivel estructural, la reducci&oacute;n del tama&ntilde;o hipocampal (siendo el tiempo de exposici&oacute;n al estresor la variable m&aacute;s consistente en los estudios revisados y que actuar&iacute;a como moduladora de la gravedad de esta reducci&oacute;n) y del c&oacute;rtex prefrontal dorsolateral son los hallazgos m&aacute;s prevalentes. Desde una perspectiva funcional, la mayor&iacute;a de los estudios describen la hiperactivaci&oacute;n del c&oacute;rtex somatosensorial, de estructuras subcorticales l&iacute;mbicas (n&uacute;cleo estriado, am&iacute;gdala) y del sistema hormonal del eje hipotal&aacute;mico, de forma simult&aacute;nea a la hipoactivaci&oacute;n del c&oacute;rtex prefrontal dorsolateral. El perfil de rendimiento neuropsicol&oacute;gico m&aacute;s repetido muestra afectaci&oacute;n en los procesos de memoria (aprendizaje de nueva informaci&oacute;n y manipulaci&oacute;n de &eacute;sta) y atencionales. La recuperaci&oacute;n involuntaria de informaci&oacute;n epis&oacute;dica (flashbacks), podr&iacute;a estar relacionada con alteraciones en el sue&ntilde;o REM, en base al papel que tiene esta fase del sue&ntilde;o en la consolidaci&oacute;n de este tipo de memorias. La existencia de da&ntilde;o cerebral traum&aacute;tico y amnesia del episodio no imposibilitar&iacute;a el desarrollo posterior del TEPT, teniendo en cuenta que los factores ambientales o externos relacionados con el trauma ser&iacute;an los disparadores de la recreaci&oacute;n de dichos episodios.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Sin llegar a haber un acuerdo en relaci&oacute;n a los mecanismos explicativos de la eficacia de la terapia EMDR, se plantea que el potencial de esta t&eacute;cnica reside en su actuaci&oacute;n sobre los procesos neuropsicol&oacute;gicos que parecen estar alterados en los sujetos con TEPT, principalmente el sue&ntilde;o REM.</font></p>     <p><font face="Verdana" size="2">Ser&iacute;a recomendable realizar nuevas investigaciones que resuelvan las dificultades metodol&oacute;gicas encontradas en los trabajos analizados, con el objetivo de poder dise&ntilde;ar un abordaje neuropsicol&oacute;gico de las dificultades cognitivas halladas en estos pacientes. Entrenar la focalizaci&oacute;n y mantenimiento atencional, la atenci&oacute;n selectiva e inhibici&oacute;n de interferencias; junto al empleo de estrategias de codificaci&oacute;n, almacenamiento y recuperaci&oacute;n de la informaci&oacute;n desde niveles profundos o significativos, representar&iacute;a un abordaje m&aacute;s global de estos pacientes; y permitir&iacute;a comparar la eficacia de un tratamiento completo y multidimensional (que incluya la rehabilitaci&oacute;n neuropsicol&oacute;gica) con los tratamientos psicol&oacute;gicos actuales.</font></p> <hr align="left" width="30%" size="1">     <p><font face="Verdana" size="2"><sup><a name="n">1</a></sup>El eje Hipot&aacute;lamo-Hipofisario-Adrenal hace referencia al sistema de comunicaci&oacute;n bidireccional entre el cerebro y las gl&aacute;ndulas adrenales mediante las interacciones hipot&aacute;lamo-hip&oacute;fisis-gl&aacute;ndulas suprarrenales. La interacci&oacute;n entre estos tres &oacute;rganos genera la siguiente cascada de reacciones propias de la respuesta de estr&eacute;s: el hipot&aacute;lamo secreta los p&eacute;ptidos CRF (o factor liberador de corticotropina) y vasopresina, que llegan hasta la gl&aacute;ndula Hip&oacute;fisis o pituritaria. &Eacute;sta secreta la hormona adrenocorticotropa (corticotropina o ACTH), que viaja en el torrente sangu&iacute;neo hasta las gl&aacute;ndulas suprarrenales. Las gl&aacute;ndulas suprarrenales secretan a su vez hormonas corticoides como el cortisol o la aldosterona, que participan en toda una serie de cambios fisiol&oacute;gicos relacionados con la respuesta de estr&eacute;s, como el metabolismo de los hidratos de carbono, el catabolismo de prote&iacute;nas, e inciden sobre el sistema inmunol&oacute;gico alterando la producci&oacute;n de anticuerpos. Este eje es un claro ejemplo de la influencia rec&iacute;proca entre sistema nervioso, sistema endocrino y sistema inmunol&oacute;gico.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>    <!-- ref --><p><font face="Verdana" size="2">(1) Yamamoto S, ShiroTakei S M, Fuchikami M, Matsuki A, Yamawaki S, Liberzon I,. Single prolonged stress: toward an animal model of posttraumatic stress disorder. <i>Depression and Anxiety</i> 2009, 26; 1110-1117.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4700589&pid=S0211-5735201300030000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">(2) Bonne O, Vythilingam M, Inagaki M, Wood S, Neumeister A, Nugent A, et al. 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<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><a href="#top"><img border="0" src="/img/revistas/neuropsiq/v33n119/seta.gif" width="15" height="17"></a><a name="bajo"></a><b>Dirección para correspondencia:</b>    <br>Raquel Seijas G&oacute;mez    <br>(<a href="mailto:raquelseijasgomez@gmail.com">raquelseijasgomez@gmail.com</a>)</font></p>     <p><font face="Verdana" size="2">Recibido: 05/09/2012    <br>Aceptado: 15/12/2012</font></p>      ]]></body><back>
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