<?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>0121-0319</journal-id>
<journal-title><![CDATA[Medicas UIS]]></journal-title>
<abbrev-journal-title><![CDATA[Medicas UIS]]></abbrev-journal-title>
<issn>0121-0319</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-03192012000300006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Avances recientes en el diagnóstico y tratamiento de la demencia vascular]]></article-title>
<article-title xml:lang="en"><![CDATA[Recent advances in the diagnosis and treatment of vascular dementia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro Samur]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caamaño]]></surname>
<given-names><![CDATA[Beatriz H]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera Carvajal]]></surname>
<given-names><![CDATA[Harold]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerro Bracho]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Magdalena  ]]></institution>
<addr-line><![CDATA[Santa Marta ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad del Magdalena  ]]></institution>
<addr-line><![CDATA[Santa Marta ]]></addr-line>
<country>Colombia.</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad del Magdalena  ]]></institution>
<addr-line><![CDATA[Santa Marta ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad del Magdalena  ]]></institution>
<addr-line><![CDATA[Santa Marta ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>25</volume>
<numero>3</numero>
<fpage>221</fpage>
<lpage>227</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-03192012000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-03192012000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-03192012000300006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: la demencia vascular es un síndrome adquirido y persistente causado por lesiones netamente vasculares a nivel del sistema nervioso central, alterando las funciones del intelecto y la cognición, indispensables para el equilibrio biológico, psicológico y social. Objetivo: describir los avances reciente en demencia vascular; criterios diagnósticos, factores predisponentes, epidemiología, neuropatología, perfil neurocognitivo y psiquiátrico y abordaje terapéutico integral. Metodología de búsqueda: revisión actualizada de la literatura, mediante búsqueda automatizada de artículos recientes en revistas indexadas en base de datos biomédicas, durante los meses de marzo a mayo del 2012. Resultados: se encontraron 55 artículos con información actualizada que consolidan los objetivos de la revisión. Conclusiones: la demencia vascular ha asumido un rol mórbido, especialmente en la población geriátrica, a consecuencia de la alta prevalencia de enfermedades cerebro-cardio vasculares; por lo cual su prevención, diagnóstico, tratamiento y rehabilitación deben ser prioridad en la práctica clínica, dada la importancia de la salud mental en esta población que en Colombia ha sido subvalorada. (MÉD. UIS. 2012;25(3):221-7).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: vascular dementia is an acquired and persistent syndrome caused by vascular injuries in the central nervous system, altering the functions of intellect and cognition, which are essential for the biological, psychological and social balance on the individual. Objective: describe the recent advances in vascular dementia; diagnostic criteria, predisposing factors, epidemiology, neuropathology, and neurocognitive profile psychiatric and comprehensive therapeutic approach. Methods: updated review of the literature, using automated search of recent articles in journals indexed in biomedical database, during the months of March to May 2012. Results: we found 55 articles with updated information that consolidate the objectives of the review. Conclusions: vascular dementia has taken an important role on morbidity, especially in the geriatric population, as a result of the high prevalence of cerebrovascular diseases. Prevention, diagnosis, treatment and rehabilitation must be priorities in the clinical practice, given the importance of mental health in this population, which has been underestimated in Colombia. (MÉD.UIS. 2012;25(3):221-7).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Demencia Vascular]]></kwd>
<kwd lng="es"><![CDATA[Infarto Cerebral]]></kwd>
<kwd lng="es"><![CDATA[Hipoxia]]></kwd>
<kwd lng="es"><![CDATA[Terapéutica]]></kwd>
<kwd lng="es"><![CDATA[Diagnóstico]]></kwd>
<kwd lng="en"><![CDATA[Vascular Dementia]]></kwd>
<kwd lng="en"><![CDATA[Cerebral Infarction]]></kwd>
<kwd lng="en"><![CDATA[Hypoxia]]></kwd>
<kwd lng="en"><![CDATA[Therapeutics]]></kwd>
<kwd lng="en"><![CDATA[Diagnosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="Verdana">     <p align="center"><font size="4"><b>Avances recientes en el diagn&oacute;stico y    <br> tratamiento de la demencia vascular</b></font></p>      <p align="right"><i>Manuel Castro Samur*    <br> Beatriz H. Caama&ntilde;o**    <br> Harold Herrera Carvajal***    <br> Daniel Guerro Bracho****</i></p>	      <p align="justify">*MD. Co-investigador Grupo de Investigaci&oacute;n en Psiquiatr&iacute;a. Universidad del Magdalena. Santa Marta. Colombia.    <br> **MD Psiquiatra. Jefe del Servicio de Salud Mental Hospital Universitario Fernando Troconis. Directora del Grupo de Investigaci&oacute;n en Psiquiatr&iacute;a de la Universidad del Magdalena. Santa Marta. Colombia.    <br> ***MD. Internado Rotatorio de Medicina - Hospital Universitario Cari. Co-investigador Grupo de Investigaci&oacute;n en Psiquiatr&iacute;a. Universidad del Magdalena. Santa Marta. Colombia.    ]]></body>
<body><![CDATA[<br> **** MD. Internado Rotatorio de Medicina - Hospital Universitario de Santander. Co-investigador Grupo de Investigaci&oacute;n en Psiquiatr&iacute;a. Universidad del Magdalena. Santa Marta. Colombia.    <br> Correspondencia: Manuel Castro Samur. Carrera 6 J &#35; 29 - 61 El Cortijo. Sincelejo. Sucre. Colombia. e-mail: <a href="mailto:mcsamur@gmail.com">mcsamur@gmail.com</a>.    <br> Art&iacute;culo recibido el 27 de Septiembre de 2012 y aceptado para publicaci&oacute;n el 6 de diciembre de 2012.</p> <hr>     <p align="left"><font size="3"><b>RESUMEN</b></font></p>     <p align="justify"><b>Introducci&oacute;n:</b> la demencia vascular es un s&iacute;ndrome adquirido y persistente causado por lesiones netamente vasculares a nivel del sistema nervioso central, alterando las funciones del intelecto y la cognici&oacute;n, indispensables para el equilibrio biol&oacute;gico, psicol&oacute;gico y social. <b>Objetivo:</b> describir los avances reciente en demencia vascular; criterios diagn&oacute;sticos, factores predisponentes, epidemiolog&iacute;a, neuropatolog&iacute;a, perfil neurocognitivo y psiqui&aacute;trico y abordaje terap&eacute;utico integral. <b>Metodolog&iacute;a de b&uacute;squeda:</b> revisi&oacute;n actualizada de la literatura, mediante b&uacute;squeda automatizada de art&iacute;culos recientes en revistas indexadas en base de datos biom&eacute;dicas, durante los meses de marzo a mayo del 2012. <b>Resultados:</b> se encontraron 55 art&iacute;culos con informaci&oacute;n actualizada que consolidan los objetivos de la revisi&oacute;n. <b>Conclusiones:</b> la demencia vascular ha asumido un rol m&oacute;rbido, especialmente en la poblaci&oacute;n geri&aacute;trica, a consecuencia de la alta prevalencia de enfermedades cerebro-cardio vasculares; por lo cual su prevenci&oacute;n, diagn&oacute;stico, tratamiento y rehabilitaci&oacute;n deben ser prioridad en la pr&aacute;ctica cl&iacute;nica, dada la importancia de la salud mental en esta poblaci&oacute;n que en Colombia ha sido subvalorada. (M&Eacute;D. UIS. 2012;25(3):221-7).</p> 	     <p align="left"><b>Palabras Clave:</b> Demencia Vascular. Infarto Cerebral. Hipoxia. Terap&eacute;utica. Diagn&oacute;stico.</p>      <p align="center"><font size="3"><b>Recent advances in the diagnosis and treatment of vascular dementia</b></font></p>     <p align="left"><font size="3"><b>ABSTRACT</b></font></p>	     <p align="justify"><b>Introduction:</b> vascular dementia is an acquired and persistent syndrome caused by vascular injuries in the central nervous system, altering the functions of intellect and cognition, which are essential for the biological, psychological and social balance on the individual. <b>Objective:</b> describe the recent advances in vascular dementia; diagnostic criteria, predisposing factors, epidemiology, neuropathology, and neurocognitive profile psychiatric and comprehensive therapeutic approach. <b>Methods:</b> updated review of the literature, using automated search of recent articles in journals indexed in biomedical database, during the months of March to May 2012. <b>Results:</b> we found 55 articles with updated information that consolidate the objectives of the review. <b>Conclusions:</b> vascular dementia has taken an important role on morbidity, especially in the geriatric population, as a result of the high prevalence of cerebrovascular diseases. Prevention, diagnosis, treatment and rehabilitation must be priorities in the clinical practice, given the importance of mental health in this population, which has been underestimated in Colombia. (M&Eacute;D.UIS. 2012;25(3):221-7).</p> 	     <p align="left"><b>Keywords:</b> Vascular Dementia. Cerebral Infarction. Hypoxia. Therapeutics. Diagnosis.</p>  <hr>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b><u>INTRODUCCI&Oacute;N</u></b></font></p>      <p align="justify">La alta incidencia de enfermedades vasculares en Colombia y el subdiagn&oacute;stico de las mismas ha convertido a la Demencia Vascular (DV) en uno de los factores m&oacute;rbidos que determinan un impacto significativo en la calidad de vida de los adultos mayores, al comprometer m&uacute;ltiples dominios cognitivos como las funciones ejecutivas, memoria, lenguaje, habilidades visuoespaciales, pudiendo incluso producir cambios en la personalidad de los sujetos afectados.</p>      <p align="justify">Las enfermedades cr&oacute;nicas como diabetes e hipertensi&oacute;n arterial, enfermedades cardiovasculares: fibrilaci&oacute;n auricular, arterioesclerosis y ateroesclerosis, comorbilidades como la dislipidemia y estilos de vida inadecuados ya sea el sedentarismo, estr&eacute;s, tabaquismo y alcoholismo son predisponentes primarios para sufrir lesiones cerebrales de tipo isqu&eacute;mico, hemorr&aacute;gico e hipoxia - isquemia; procesos directamente implicados en la g&eacute;nesis de la DV2,3. Por tanto conocer su estado del arte, permitir&iacute;a actuar en fases tempranas evitando as&iacute; las consecuencias irreversibles de esta enfermedad.</p>      <p align="justify">Estos antecedentes motivan a presentar una revisi&oacute;n actualizada que recopila las teor&iacute;as m&aacute;s relevantes en la materia, define los criterios m&aacute;s sensibles y espec&iacute;ficos para el diagn&oacute;stico, describe los factores de riesgos frecuentemente asociados, los &iacute;ndices epidemiol&oacute;gicos mundiales y colombianos, la neuropatolog&iacute;a org&aacute;nica y psiqui&aacute;trica, las pruebas imagenol&oacute;gicas de elecci&oacute;n y el abordaje terap&eacute;utico integral para pacientes con DV.</p>      <p align="center"><font size="3"><b><u>METODOLOG&Iacute;A DE B&Uacute;SQUEDA</u></b></font></p>     <p align="justify">Se realiz&oacute; una revisi&oacute;n automatizada y actualizada de la literatura, recolectando art&iacute;culos de revistas indexadas pertenecientes a bases de datos cient&iacute;ficas de alto reconocimiento; PUDMED, Cochrane, Imbiomed, EBSCOhost, Medline, en un periodo comprendido entre los meses de marzo a mayo de 2012. Solo se incluyeron art&iacute;culos de revisi&oacute;n y originales productos de investigaciones publicados en idioma espa&ntilde;ol e ingl&eacute;s, todos ellos con menos de cinco a&ntilde;os desde su presentaci&oacute;n. Como estrategia de b&uacute;squeda se utilizaron descriptores (demencia vascular, infarto cerebral, hipoxia, epidemiologia, patog&eacute;nesis, diagn&oacute;stico y tratamiento de la DV), todos ellos aceptados por la base de datos MeSH; herramienta ling&uuml;&iacute;stica por excelencia utilizada internacionalmente para la b&uacute;squeda de material bibliogr&aacute;fico biom&eacute;dico de alta calidad. El n&uacute;mero de art&iacute;culos que cumplieron con los criterios de inclusi&oacute;n y fueron citados en la presente revisi&oacute;n fueron 55. La informaci&oacute;n fue analizada cr&iacute;ticamente y presentada en concordancia con la evidencia cient&iacute;fica. No se presentaron buscadores simult&aacute;neos.</p>      <p align="justify"><B>DEMENCIA VASCULAR</B></p>     <p align="justify"><i>Epidemiolog&iacute;a</i></p>     <p align="justify"><b>Prevalencia:</b> La demencia es una enfermedad frecuente de la poblaci&oacute;n geri&aacute;trica afectando al 6,4-8&#37; de la poblaci&oacute;n mayor de 65 a&ntilde;os. Partiendo de la edad su prevalencia se duplica cada cinco a&ntilde;os llegando al 29,8-50&#37; en los mayores de 85 a&ntilde;os. De todas la demencias del mundo occidental, la enfermedad de Alzheimer es la m&aacute;s frecuente (40- 65&#37;), seguida por la DV 15-20&#37;)<sup>4</sup>. Por el contrario y consecuente a la prevalencia de enfermedad de peque&ntilde;os vasos en China y Jap&oacute;n la DV se constituye como la primera causa demencial. Los cuadros mixtos (demencia tipo Alzheimer y vascular) se establecen como la tercera causa con una probabilidad 11-20&#37; y su amento exponencial obedece a la recurrencia de infartos cerebrales. Las estad&iacute;sticas actuales fluct&uacute;an a causa de la variaci&oacute;n de la sensibilidad y especificidad de los criterios diagn&oacute;stico para DV<sup>5</sup>.</p>      <p align="justify"><b>Incidencia:</b> La incidencia de la DV aumenta con la edad de forma exponencial: 0&#39;27 por 100 pacientes a&ntilde;o entre 60 y 69 a&ntilde;os, y 2&#39;74 por encima de 80 a&ntilde;os<sup>4</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify"><b>Pron&oacute;stico:</b> La supervivencia en DV es menor que en la enfermedad de Alzheimer y su mortalidad anual supera el 10&#37; y su aumento depende de factores como Volumen del infarto (&gt;33 mm), grado de limitaci&oacute;n f&iacute;sica subsecuente, mayor edad, g&eacute;nero masculino y recurrencias de infartos cerebrales<sup>4</sup>.</p>      <p align="justify">Factores de riesgo: Los factores de riesgo se dividen en demogr&aacute;fico, aterog&eacute;nicos, no aterog&eacute;nicos y asociados a ECV(6-12) (ver <a href="#t01">Tabla 1</a>).</p>     <p align="center"><a name="t01"></a><img src="img/revistas/muis/v25n3/v25n03a06t1.jpg"></p>      <p align="left"><i>Criterios diagn&oacute;sticos</i></p>     <p align="justify">La falta de unificaci&oacute;n de par&aacute;metros diagn&oacute;sticos para DV se refleja en m&uacute;ltiples criterios actualmente existentes descritos en los m&uacute;ltiples textos que se encuentran iniciando por el manual diagn&oacute;stico y estad&iacute;stico de trastornos mentales de la Asociaci&oacute;n Americana de Psiquiatr&iacute;a en su cuarta edici&oacute;n (DSM-IV), d&eacute;cima revisi&oacute;n de la Clasificaci&oacute;n Internacional de Enfermedades y Problemas de Salud Relacionados (CIE-10), los centros del Estado de California para el Diagn&oacute;stico y Tratamiento de la Enfermedad de Alzheimer (ADDTC), la rama neuroepidemiolog&iacute;ca del Instituto Nacional de Trastornos Neurol&oacute;gicos e Infarto con soporte de la Asociaci&oacute;n Internacional para la Investigaci&oacute;n y la Ense&ntilde;anza de las Neurociencias (NINCS-AIREN), el &Iacute;ndice Isqu&eacute;mico de Hachinski y la escala global de deterioro. Con excepci&oacute;n de la autopsia que es el est&aacute;ndar de oro diagn&oacute;stico, ning&uacute;n criterio es lo suficientemente sensible y espec&iacute;fico para DV, no obstante los m&aacute;s utilizados en investigaci&oacute;n son los de NINCSAIREN y para diagn&oacute;stico cl&iacute;nico los del ADDTC. Estos dos exigen la utilizaci&oacute;n de la neuroimagen y la confirmaci&oacute;n histopatol&oacute;gica para establecer el diagn&oacute;stico de DV<sup>13-6</sup>.</p>      <p align="justify"><i>Patog&eacute;nesis</i></p>      <p align="justify">La mayor&iacute;a de los procesos fisiopatol&oacute;gicos de las enfermedades causantes de DV finalizan en lesiones cerebrales isqu&eacute;mica (75&#37;), hemorr&aacute;gicas (15&#37;) e hip&oacute;xico- isqu&eacute;micas (5&#37;). Estas lesiones interrumpen las conexiones entre m&uacute;ltiples regiones cerebrales que se encuentran unidas entre s&iacute;, por circuitos nerviosos dependientes de neurotransmisores generan un deterioro de las funciones propias de las zonas afectadas. Aunque las grandes regiones de isquemia son las &iacute;ntimamente ligadas a la g&eacute;nesis de la DV, peque&ntilde;os y &uacute;nicos infartos localizados en territorios estrat&eacute;gicos tambi&eacute;n pueden iniciar su aparici&oacute;n<sup>17-21</sup>.</p>      <p align="justify"><b>Desconexi&oacute;n de los circuitos cortico-subcorticales:</b> La corteza frontal se encuentra delimitada por la cisura de Rolando que las separa de los l&oacute;bulos parietales, la cisura de Silvio que la diferencia de los l&oacute;bulos temporales y el c&iacute;ngulo que limita a la subcorteza. El l&oacute;bulo frontal se divide en corteza motora premotora y prefrontal. Esta &uacute;ltima es la m&aacute;s importante en la g&eacute;nesis de DV por ser el origen de tres circuitos (prefrontaldorsolateralsubcorticocortical, prefrotalorbitolateralsubcortico-cortical y prefrontalmesialsubcortico cortical que comprende el giro del c&iacute;ngulo anterior)<sup>22</sup>.</p>       <p align="justify">Los circuitos nacen en diferentes &aacute;reas de la corteza prefrontal y se conectan con la subcorteza, excitando e inhibiendo a m&uacute;ltiples estructuras a trav&eacute;s de glutamato y GABA, respectivamente. Inicialmente se establece la excitaci&oacute;n del n&uacute;cleo caudado por parte de la corteza prefrontal, este a su vez inhibe al <i>globus pallidus</i> reduciendo su secreci&oacute;n de GABA que mantiene inhibido al t&aacute;lamo. La excitaci&oacute;n del t&aacute;lamo por efecto del d&eacute;ficit de neurotransmisor inhibidor en su uni&oacute;n con el <i>globus pallidus</i>, determina la estimulaci&oacute;n de la corteza prefrontal, cerrando el circuito. Los neurotransmisores globales que modulan cada fase de las v&iacute;as frontosubcorticales son la acetilcolina, dopamina y noradrenalina<sup>22,23</sup>.</p>      <p align="justify">Las enfermedades que lesionan el tejido cerebral a trav&eacute;s de procesos isqu&eacute;micos, hemorr&aacute;gicos o hip&oacute;xico-isqu&eacute;micos producen desconexi&oacute;n de los circuitos cortico-subcorticales generando un cuadro sintomatol&oacute;gico propio del &aacute;rea afectada. Si la lesi&oacute;n se ubica en regi&oacute;n dorsolateral (&aacute;reas 9-10 de Brodmann, territorio dorsolateral del n&uacute;cleo caudado, lateral dorsomedial del <i>globus pallidus</i> y la porci&oacute;n ventral y dorsomedial del t&aacute;lamo) predominar&aacute; el s&iacute;ndrome disejecutivo, caracterizado por alteraci&oacute;n de las funciones ejecutivas como la organizaci&oacute;n, secuenciaci&oacute;n, abstracci&oacute;n y planificaci&oacute;n, s&iacute;ntomas asociados que incluyen alteraci&oacute;n de la memoria de trabajo, amnesia frontal, escasa fluidez verbal y no verbal y alteraci&oacute;n de la programaci&oacute;n motora. Por otra parte, si la regi&oacute;n afectada es la orbitofrontal (&aacute;reas 11-12 de Brodmann, porci&oacute;n ventral anterior del n&uacute;cleo caudado, la zona medial dorsomedial del globus pallidus y ventral anterior y dorsomedial del t&aacute;lamo) el cuadro cl&iacute;nico se evidencia en la desinhibici&oacute;n de la personalidad, signos y s&iacute;ntomas asociados como la ausencia de normas sociales, descontrol de impulsos reiterativos, conducta de utilizaci&oacute;n y memoria. Finalmente si la lesi&oacute;n compromete el circuito mesial (&aacute;rea 24 de Brodmann, n&uacute;cleo accumbens, regi&oacute;n rostrolateral del globus pallidus y t&aacute;lamo dorsomedial) la cl&iacute;nica evidenciada ser&aacute; la abulia asociada a mutismo acin&eacute;tico, desmotivaci&oacute;n, ausencia de respuestas motoras, verbales y emocionales<sup>22-30</sup> (ver <a href="#f01">Figura 1</a>)</p>     ]]></body>
<body><![CDATA[<p align="center"><a name="f01"></a><img src="img/revistas/muis/v25n3/v25n03a06g1.jpg"></p>      <p align="justify"><b>Alteraciones gen&eacute;ticas</b>: Las demencias, especialmente la de tipo Alzheimer y vascular comparten rasgos gen&eacute;ticos importantes en la aparici&oacute;n de la enfermedad. El alelo &Eacute;psilon 4 del gen que codifica para la lipoprote&iacute;na E interviene en la regulaci&oacute;n metab&oacute;lica de los l&iacute;pidos y la reparaci&oacute;n del sistema nervioso central, por lo tanto irregularidades gen&eacute;ticas que generan defectos en su funci&oacute;n, tienen como consecuencia ateroesclerosis y d&eacute;ficit en la funci&oacute;n reparadora neuronal que termina en muerte de tejido cerebral por isquemia, hemorragia o hipoxia-isquemia<sup>31-3</sup>.</p>      <p align="justify"><b>Clasificaci&oacute;n</b></p>  <ul type="disc">     <li><b>DV cortical:</b> Se debe a multiinfartos, hemorragias e hipoxia-isquemia. Su cl&iacute;nica evidencia apraxia, afasia, agnosia, alteraciones de las funciones visuoespaciales y visuoconstructivas, d&eacute;ficit de la memoria y alteraci&oacute;n del c&aacute;lculo<sup>34,35</sup>.</li>      <li>DV subcortical. Es causada frecuentemente por enfermedades de peque&ntilde;os vasos e infartos estrat&eacute;gicos en la subcorteza. Se caracteriza por sus signos y sintomatolog&iacute;a t&iacute;pica consistente en disfunci&oacute;n ejecutiva, trastorno de la atenci&oacute;n y motivaci&oacute;n, trastorno del afecto, apat&iacute;a, abulia, ataxia y s&iacute;ndrome pseudobulbar<sup>34,35</sup>.</li>     </ul>     <p align="justify"><i>Neuroim&aacute;genes</i></p>     <p align="justify">El avance acelerado de las ayudas diagn&oacute;sticas ha permitido la identificaci&oacute;n de las variedades de lesiones a nivel del sistema nervioso central causantes de DV. La m&aacute;s utilizada actualmente es la tomograf&iacute;a computarizada por su costo-efectividad. No obstante la resonancia magn&eacute;tica con t&eacute;cnica de ponderaci&oacute;n de la difusi&oacute;n se est&aacute; convirtiendo en la modalidad radiol&oacute;gica de elecci&oacute;n ya que permite la evaluaci&oacute;n de la isquemia, hemorragia, masa-efecto de masa y otras patolog&iacute;as distintivas de la DV; y a diferencia de la tomograf&iacute;a computarizada y la resonancia magn&eacute;tica cl&aacute;sica, tambi&eacute;n identifica los territorios activos del cerebro en riesgo potencialmente preservables en isquemia aguda y muestra el patr&oacute;n del infarto sugiriendo una etiolog&iacute;a<sup>36-42</sup>.</p>      <p align="justify"><i>Alteraciones neurocognitivas</i></p>     <p align="justify">Las lesiones vasculares cerebrales extensas o peque&ntilde;as y estrat&eacute;gicas determinan la progresi&oacute;n escalonada de s&iacute;ntomas cognitivos, &eacute;stos a su vez culminan en un s&iacute;ndrome global caracter&iacute;stico no solo de la DV sino de otros tipos de demencias m&aacute;s frecuentes como la enfermedad de Alzheimer. De all&iacute; que actualmente se describan cuadros demenciales mixtos. El trastorno atencional y disejecutivo son las alteraciones cognitivas m&aacute;s frecuentes, seguidas por la lentitud psicomotora y la p&eacute;rdida de memoria de fijaci&oacute;n. Se observa a un paciente con cambio significativo de la personalidad, sin iniciativa, ap&aacute;tico e incapaz para abstraer al planificar e iniciar una actividad, la cual realiza lentamente, desatento, sin motivaci&oacute;n y concentraci&oacute;n; lo que incentiva al fracaso y por tanto al no cumplimiento de los objetivos de trabajo trazados. Adem&aacute;s se torna olvidadizo, desorientado, con alteraciones del lenguaje que divergen seg&uacute;n el &aacute;rea cerebral afectada, es as&iacute; como se observa reducida la afluencia verbal y la complejidad del discurso, esto consecuente a la disartria esp&aacute;stica<sup>22-30</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify"><i>Alteraciones neuropsiqui&aacute;tricas</i></p>     <p align="justify">Trastorno del afecto: Generalmente se producen por lesiones isqu&eacute;micas subcorticales. El estado depresivo mayor es el m&aacute;s frecuente, present&aacute;ndose en el 21&#37; de los pacientes con DV, cifra menor en enfermedad de Alzheimer. Con menos frecuencia el trastorno bipolar y la distimia. Actualmente se ha designado el termino de s&iacute;ndrome de disfunci&oacute;n ejecutiva y depresi&oacute;n de comienzo tard&iacute;o a los pacientes con lesiones vasculares subcorticales con s&iacute;ntomas depresivos y cognitivos que se caracterizan por ideaci&oacute;n delirante paranoide, marcado retardo psicomotor, desinter&eacute;s por las actividades diarias, anhedonia, m&aacute;s discapacidad funcional que la depresi&oacute;n no vascular y cuadros maniformes irritabilidad<sup>43-5</sup>.</p>      <p align="justify"><b>Psicosis:</b> Tambi&eacute;n denominada psicosis de comienzo tard&iacute;o, se presenta en el 20&#37; de los pacientes con DV. La cl&iacute;nica revela predominios de ideas delirantes y existencia de una afectaci&oacute;n preponderante de &aacute;reas temporales<sup>46</sup>.</p>      <p align="justify"><b>Agresi&oacute;n:</b> Se asocia a hipoperfusi&oacute;n temporal izquierda, corteza frontal dorsolateral y regi&oacute;n parietal derecha. Se presenta agitaci&oacute;n psicomotora en el 25&#37; de los paciente con agresi&oacute;n, irritabilidad en 21,4&#37;, agresi&oacute;n f&iacute;sica heterodirigida en 20&#37;<sup>47</sup>.</p>      <p align="justify"><b>Trastorno de la ansiedad:</b> El origen de los trastornos de ansiedad se genera en frecuencia por afecci&oacute;n en la corteza &oacute;rbitofrontal. Los pacientes con demencia y ansiedad muestran una gran preocupaci&oacute;n por su futuro, finanzas o salud, por situaciones anteriormente no estresantes. La manifestaci&oacute;n corriente es la preocupaci&oacute;n por un hecho venidero en forma de preguntas incesantes y repetitivas sobre ese hecho (s&iacute;ndrome de Godot) que son una carga muy pesada para la familia y los cuidadores. Otro s&iacute;ntoma de ansiedad es la fobia a quedarse solo<sup>43</sup>.</p>      <p align="justify"><i>Tratamiento</i></p>      <p align="justify">En la terap&eacute;utica de un paciente con DV se deben controlar los factores de riesgo, prevenir los eventos vasculares y tratar los trastornos cognitivos o conductuales.</p>      <p align="justify"><b>Factores de riesgo:</b> Hipertensi&oacute;n arterial, patolog&iacute;as cardiacas embolizantes, accidentes cerebrovasculares o accidentes isqu&eacute;micos transitorio previos, tabaquismo, alcoholismo, hematocrito elevado, dislipidemias y diabetes mellitus son factores de riesgo inherentes a un evento patol&oacute;gico vascular cerebral y su control a tiempo minimiza la probabilidad de aparici&oacute;n de la DV y m&aacute;s a&uacute;n si estas comorbilidades est&aacute;n asociadas a la mayor&iacute;a de edad, incrementando el riesgo de isquemia, hemorragia o hipoxia que son los mecanismos que intervienen en la patog&eacute;nesis de la DV<sup>48-50</sup>.</p>      <p align="justify"><b>Prevenci&oacute;n de los eventos vasculares:</b> Sin duda los f&aacute;rmacos antiagregantes plaquetarios son de elecci&oacute;n en la prevenci&oacute;n del accidente cerebrovascular isqu&eacute;mico. En este grupos se incluye el &aacute;cido acetilsalic&iacute;lico, ticlopidina y el dipiridamol. De todos ellos el m&aacute;s estudiado es el &aacute;cido acetilsalic&iacute;lico reduciendo en un 25&#37; infartos cerebrales y cardiacos, constituy&eacute;ndose como pilar de oro para la prevenci&oacute;n de la DV en pacientes con comorbilidades y factores de riesgo que predispongan a enfermedad cerebro vascular-isqu&eacute;mico e hipoxia cerebral<sup>48-50</sup>.</p>      <p align="justify"><b>Tratamiento del deterioro cognitivo o conductual:</b> La terap&eacute;utica incluye los moduladores glutamat&eacute;rgicos, bloqueadores de los canales de calcio e inhibidores de la colinesterasa.</p>  <ul type="disc">     ]]></body>
<body><![CDATA[<li>Moduladores glutamat&eacute;rgicos: La estimulaci&oacute;n excesiva del tejido cerebral por glutamato, el principal neurotransmiros excitatorio, puede causar da&ntilde;o neuronal, lo que se conoce como excitotoxicidad. Normalmente el glutamato activa a dos clases de receptores: ionotr&oacute;picos y metabotr&oacute;picos, en los primeros se han descritos dos subtipos: &aacute;cido alfa aminohidroxi- 5-metil-4-isoxazol propi&oacute;nico (AMPA) que son los m&aacute;s numerosos y est&aacute;n unidos a canales de sodio y potasio; y los N-metil-Dasp&aacute;rtico( NMDA) asociados a canales de alta conductancia permeables a sodio, potasio y calcio, siendo este receptor responsable de los fen&oacute;menos de memoria y g&eacute;nesis de los cuadros demenciales. Los metabotr&oacute;picos influyen en la plasticidad neuronal. La memantina es un f&aacute;rmaco modulador de la neurotransmisi&oacute;n glutamat&eacute;rgica con una importante actividad dual dependiente de su concentraci&oacute;n. En bajas concentraciones favorece al potencial excitatorio trascendental para el aprendizaje y la memoria, y en altas concentraciones es agonista parcial de los receptores NMDA, regulando la entrada de calcio a la neurona, desactivando todos los mecanismo de muerte neuronal mediado por la hipercalcemia intracelular. La seguridad y eficacia de la memantina se demuestra con un estudio multicentrico doble ciego contra placebo, en Gran Breta&ntilde;a, en pacientes con DV moderada a severa. Los resultados evidenciaron mejor&iacute;a importante en la cognici&oacute;n, con pocos efectos adversos (mareos, confusi&oacute;n y constipaci&oacute;n) y buena tolerabilidad<sup>51</sup>.</li>      <li>Bloqueadores de los canales de calcio: El calcio cumple un rol importante en las funciones y flujo sangu&iacute;neo cerebral. La nimodipina es un f&aacute;rmaco que cruza la barrera hematoencef&aacute;lica y reduce los canales lentos de calcio evitando la contracci&oacute;n vascular y la sobrecarga de calcio de la c&eacute;lula nerviosa con acci&oacute;n antiisqu&eacute;mica y neuroprotectora, por lo que evita la sobrecarga c&aacute;lcica de la neurona expuesta a da&ntilde;o isqu&eacute;mico y resguarda la integridad tisular cerebral al mantener el flujo sangu&iacute;neo. Estudios doble ciego han demostrado que pacientes geri&aacute;tricos con DV por enfermedad de peque&ntilde;os vasos se benefician con el uso de nimodipina, logrando mejor&iacute;a cognitiva y en actividades de la vida diaria<sup>52</sup>.</li>      <li>Inhibidores de la colinesterasa: En la DV, el deterioro cognitivo posee una distribuci&oacute;n irregular, con compromiso focal de unas funciones y preservaci&oacute;n de otras, por ejemplo, en pacientes con DV puede presentarse disfunci&oacute;n ejecutiva con indemnidad de la memoria. Estos s&iacute;ntomas y signos hipot&eacute;ticamente subyacen en el d&eacute;ficit colin&eacute;rgico de regiones cerebrales lesionadas y por tanto inhibidores de la colinesterasa incrementar&iacute;an la concentraci&oacute;n de acetilcolina y beneficiar&iacute;an a los pacientes con un cuadro demencial con alteraciones de la cognici&oacute;n y conducta. Los f&aacute;rmacos m&aacute;s utilizados de &eacute;ste grupo son anticolinester&aacute;sicos reversibles como el donezepilo y la galantamina, y los pseudoreversibles como la fisostigmina y la rivastigmina<sup>53,54</sup>.</li>     </ul>     <p align="center"><font size="3"><b><u>CONCLUSI&Oacute;N</u></b></font></p>      <p align="justify">La DV como enfermedad que deteriora la calidad de vida de la poblaci&oacute;n geri&aacute;trica, ha sido subdiagnosticada en la pr&aacute;ctica cl&iacute;nica por la desidia te&oacute;rica de los m&eacute;dicos sobre este tema. Por esto es f&aacute;cil atribuir la variedad de s&iacute;ntomas y signos de tan importante enfermedad a la historia natural del envejecimiento. Es necesario conocer que cuando se instaura la cl&iacute;nica de la DV ya se ha establecido una lesi&oacute;n cerebral, por lo cual el quehacer m&eacute;dico ejerce mayor importancia en la prevenci&oacute;n a trav&eacute;s del control de los factores de riesgo y enfermedades que la predisponen. Por otra parte el abordaje terap&eacute;utico paliativo de los s&iacute;ntomas cognoscitivos y conductuales es el mejor aporte de la medicina no solo al paciente sino tambi&eacute;n a la sociedad que le rodea.</p>      <p align="center"><font size="3"><b><u>FINANCIACI&Oacute;N</u></b></font></p>     <p align="justify">Los autores.</p>      <p align="center"><font size="3"><b><u>CONFLICTOS DE INTERESES</u></b></font></p>     <p align="justify">NO</p>     ]]></body>
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