<?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>0034-7450</journal-id>
<journal-title><![CDATA[Revista Colombiana de Psiquiatría]]></journal-title>
<abbrev-journal-title><![CDATA[rev.colomb.psiquiatr.]]></abbrev-journal-title>
<issn>0034-7450</issn>
<publisher>
<publisher-name><![CDATA[Asociacion Colombiana de Psiquiatria.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74502000000200005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[DEMENCIA FRONTEMPORAL UNA REDIMENSIÓN DE LA ENFERMEDAD DE PICK]]></article-title>
<article-title xml:lang="en"><![CDATA[FRONTOTEMPORAL DEMENTIA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[DOVAL]]></surname>
<given-names><![CDATA[ÓSCAR]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GAVIRIA]]></surname>
<given-names><![CDATA[MOISÉS]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario de Caracas Servicio de Psiquiatría ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Illinois Department of Psychiatry Neuropsychiatric División]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2000</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2000</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>127</fpage>
<lpage>154</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74502000000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74502000000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74502000000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La Demencia Frontotemporal, más que una nueva entidad patológica, es la redefinición de la clásica Enfermedad de Pick, como parte de un extenso síndrome con una prevalencia mayor a la imaginada. Incluye a todos aquellos procesos degenerativos primarios que se inician en las porciones anteriores del cerebro, clínicamente manifiestos por trastornos de conducta y personalidad, más que por alteraciones de carácter cognitivo. En el presente trabajo se hace una revisión bibliográfica del tema, adentrándose en las características clínicas, paraclínicas, neuropatológicas y genéticas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Frontotemporal Dementia, is not a new clinical entity but a redefinition of the classical Pick's disease as a part of a extensive syndrome with important and unsuspected prevalence. Frontotemporal Dementia includes all primary degenerative processes starting in the anterior portions of the brain. This type of dementia is clinically characterized by behavior and personality disorders, more than cognitive alterations. In the present research we performed a bibliographic review of the subject including clinical characteristics, laboratory tests, neuropathology, and genetics.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Demencia Frontotemporal]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad de Pick]]></kwd>
<kwd lng="es"><![CDATA[Neuropatología]]></kwd>
<kwd lng="en"><![CDATA[Frontotemporal Dementia]]></kwd>
<kwd lng="en"><![CDATA[Pick's Disease]]></kwd>
<kwd lng="en"><![CDATA[Neuropathology]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">      <P align="center"><font size="4"><b>DEMENCIA FRONTEMPORAL    <br> UNA REDIMENSI&Oacute;N DE LA ENFERMEDAD DE PICK</b></font></p>      <p align="center"><font size="3"><b>FRONTOTEMPORAL DEMENTIA</b></font></p>      <p align="center">&Oacute;SCAR DOVAL* Y MOIS&Eacute;S GAVIRIA**</p>      <p>* Servicio de Psiquiatr&iacute;a del Hospital Universitario de Caracas, Venezuela. Grupo M&eacute;dico HUMANA. Caracas, Venezuela. Neuropsychiatric Fellow -University o&iacute; Illinois at Chicago.    <br> **Director Neuropsychiatric Divisi&oacute;n, Department of Psychiatry, University of Illinois at Chicago.</p>      <p align="justify">Correspondencia: Osear Doval M.D.    <br> 912 S Wood Street, fourth floor, Chicago, Illinois 60612-7327.    <br> E-mail: <a href="mailto:odoval@hotmail.com">odoval@hotmail.com</a>.</p>  <hr>      ]]></body>
<body><![CDATA[<p><font size="3"><b>RESUMEN</b></font></p>      <p align="justify">La Demencia Frontotemporal, m&aacute;s que una nueva entidad patol&oacute;gica, es la redefinici&oacute;n de la cl&aacute;sica Enfermedad de Pick, como parte de un extenso s&iacute;ndrome con una prevalencia mayor a la imaginada.</p>      <p align="justify">Incluye a todos aquellos procesos degenerativos primarios que se inician en las porciones anteriores del cerebro, cl&iacute;nicamente manifiestos por trastornos de conducta y personalidad, m&aacute;s que por alteraciones de car&aacute;cter cognitivo. En el presente trabajo se hace una revisi&oacute;n bibliogr&aacute;fica del tema, adentr&aacute;ndose en las caracter&iacute;sticas cl&iacute;nicas, paracl&iacute;nicas, neuropatol&oacute;gicas y gen&eacute;ticas.</p>      <p align="justify"><b>Palabras clave: </b>Demencia Frontotemporal; Enfermedad de Pick; Neuropatolog&iacute;a.</p>  <hr>      <p><font size="3"><b>ABSTRACT</b></font></p>      <p align="justify">Frontotemporal Dementia, is not a new clinical entity but a redefinition of the classical Pick's disease as a part of a extensive syndrome with important and unsuspected prevalence.</p>      <p align="justify">Frontotemporal Dementia includes all primary degenerative processes starting in the anterior portions of the brain. This type of dementia is clinically characterized by behavior and personality disorders, more than cognitive alterations. In the present research we performed a bibliographic review of the subject including clinical characteristics, laboratory tests, neuropathology, and genetics.</p>      <p align="justify"><b>Key words: </b>Frontotemporal Dementia; Pick's Disease; Neuropathology.</p>  <hr>       <p align="justify"><font size="3"><b>INTRODUCCI&Oacute;N</b></font></p>      <p align="justify">Arnold Pick, entre 1892 y 1906, report&oacute; cuatro casos de pacientes con atrofia del l&oacute;bulo frontal y la porci&oacute;n anterior del l&oacute;bulo temporal, cuyas manifestaciones cl&iacute;nicas eran b&aacute;sicamente trastornos de conducta y afasia progresiva, lo que fue acu&ntilde;ado como Enfermedad de Pick <Sup>(1)</Sup>. Este ep&oacute;nimo pas&oacute; a ser la representaci&oacute;n de un tipo infrecuente, casi ex&oacute;tico de demencia, que ocasionalmente era escuchado como referencia anecd&oacute;tica ajena. Transcurri&oacute; casi un siglo desde estas publicaciones iniciales, hasta que dos grupos de investigadores, en Lund (Suecia) y Manchester (Gran Breta&ntilde;a), casi de forma simult&aacute;nea, comenzaron a publicar al final de la d&eacute;cada de los 80, una serie de trabajos respecto a un tipo particular de demencia que compromete los l&oacute;bulos frontales y la porci&oacute;n anterior de los l&oacute;bulos temporales que pod&iacute;a ser definida como entidad cl&iacute;nica particular.</p>      ]]></body>
<body><![CDATA[<p align="justify">El t&eacute;rmino de Demencia Fronto-temporal (DFT) es usado para significar todos aquellos procesos degenerativos primarios de la porci&oacute;n anterior del cerebro, caracterizados por sus manifestaciones cl&iacute;nicas, hallazgos en neuroim&aacute;genes y elementos histopatol&oacute;gicos, que resultan de especial importancia para la psiquiatr&iacute;a, por su tendencia a presentarse como trastornos de conducta y personalidad; siendo una frecuente causa de demencia en las etapas media y tard&iacute;a de la vida <Sup>(2-5)</Sup>.</p>      <p>Le enfermedad ha sido denominada de diversas formas a lo largo de estos &uacute;ltimos a&ntilde;os, significando esto, m&aacute;s que un problema sem&aacute;ntico, una verdadera fuente de controversia entre los autores, con diversas implicaciones de car&aacute;cter taxon&oacute;mico <Sup>(1)</Sup>. As&iacute;, en la literatura podr&aacute; encontrarse la misma entidad bajo denominaciones tales como Enfermedad de Pick (EP), Gliosis Subcortical Progresiva (GSP)<Sup>(6)</Sup>, Demencia Frontal del tipo No-Alzheimer (DFNA)<Sup>(7)</Sup>, Demencia Frontal (DF)<Sup>(3)</Sup>, Demencia Frontal sin histolog&iacute;a distintiva (DFS-HD) <Sup>(8-9)</Sup>, Complejo de Desinhibi-ci&oacute;n-Demencia-Parkins onismo&#094; Amiotrofia (CDDPA)<Sup>(11)</Sup> y Demencia Hereditaria con Disfasia-Desin-hibici&oacute;n (DHDD)<Sup>(11)</Sup>. Por consenso, los grupos de Lund y Manchester decidieron denominarla DFT<sup>(12)</sup>, siendo probablemente el t&eacute;rmino m&aacute;s extendido y aceptado. Actualmente, en b&uacute;squeda de mayor claridad y precisi&oacute;n, la nomenclatura parece evolucionar hacia la de Degeneraci&oacute;n Frontotemporal (DgFT)<sup>(13)</sup>.</p>      <p>Aunque la Enfermedad de Alzheimer (EA) continua siendo el tipo de demencia m&aacute;s frecuente en el mundo occidental, con una prevalencia estimada entre 60 y 80% de los casos de demencia<Sup>(14-15)</Sup>, se ha encontrado que muchos de los pacientes que anteriormente hab&iacute;an recibido el diagn&oacute;stico de EA, pueden ser actualmente incluidos dentro de los criterios de DFT.</p>      <p align="justify">Diferentes estudios han sugerido que las DFT puede constituir entre el 10 y 20% de los casos de demencia que se inician durante el per&iacute;odo presenil de la vida; presentando tan solo entre un 5 y &quot;10% de este grupo, los cambios histol&oacute;gicos caracter&iacute;sticos de la EP<Sup>(2,3-5-7-16)</Sup>. En la mayor&iacute;a de los casos, el inicio de la enfermedad ocurre en la etapa presenil de la vida, con un rango promedio de edad entre los 45 y 65 a&ntilde;os y con un discreto predominio en varones, report&aacute;ndose mayor incidencia familiar que en otros tipos de demencia(<sup>3-5-13-21-23)</sup>.</p>      <p align="justify"><font size="3"><b>PRESENTACI&Oacute;N CL&Iacute;NICA</b></font></p>      <p>El inicio de la DFT suele ser insidioso, con progresiva afecci&oacute;n de la conducta y deterioro de la personalidad, siendo estos, los principales s&iacute;ntomas. Cl&iacute;nicamente no puede separarse la EP del resto de los tipos de DFT, pudiendo realizarse el diagn&oacute;stico diferencial s&oacute;lo en los estudios postmorten <Sup>(2-7)</Sup>. Quiz&aacute;s lo m&aacute;s llamativo y de presentaci&oacute;n temprana, es la tendencia a la desinhibici&oacute;n, con frecuente rompimiento de normas sociales, falta de tacto, pobre sentido com&uacute;n y capacidad de introspecci&oacute;n, impulsividad, ineficiencia e indiferencia ante las actividades laborales y del hogar, descuido del aseo y apariencia personal y eventual agresividad<sup>(2,16,24-26)</sup>. As&iacute; mismo, puede observarse conducta de exploraci&oacute;n y de utilizaci&oacute;n, tocando y tratando de usar todos los objetos que encuentran a su paso. Tambi&eacute;n, conducta estereotipada y perseverativa <Sup>(2-21)</Sup>.</p>      <p>Se presenta adem&aacute;s una marcada inquietud con gran distractibilidad, o por el contrario tendencia a la inercia y akinesia<Sup>(21)</Sup>. La incontinencia urinaria suele ser relativamente precoz <Sup>(2)</Sup>. Una observaci&oacute;n frecuente es el cambio en los h&aacute;bitos alimenticios, con deseo de comer especialmente alimentos ricos en carbohidratos y disminuci&oacute;n de la capacidad de saciedad, lo que conlleva a un incremento de peso. A esta caracter&iacute;stica particular se la ha llamado &quot;hiperoralidad&quot;; los otros elementos reportados en el s&iacute;ndrome de Kl&uuml;ver Buey (conducta exploratoria con la boca e hipersexua-lidad), resultan menos frecuentes pero se pueden observar<Sup>(16-27)</Sup>.</p>      <p>El afecto por lo general es aplanado, con falta de espontaneidad, marcada apat&iacute;a y poca capacidad emp&aacute;tica para con familiares y amigos lo cual, en muchas oportunidades, lleva a el aislamiento social. En otros casos, se puede presentar euforia, con marcada e inapropiada jocosidad o humor pueril<Sup>(2,16-24,28)</Sup>. Es frecuente observar signos cl&iacute;nicos de lo que Blumer y Ben-son originalmente denominaron como tipos de personalidad pseu-dopsicop&aacute;tica y pseudodepresiva del s&iacute;ndrome del l&oacute;bulo frontal<sup>(24,29,30)</sup> como dato m&aacute;s curioso que frecuente, en un estudio reciente se reporta el desarrollo de cualidades art&iacute;sticas de car&aacute;cter pl&aacute;stico en pacientes con DFT<sup>(31,32)</sup>.</p>      <p align="justify">Han sido descritas manifestaciones psiqui&aacute;tricas de diversa naturaleza hasta en un 60% de los pacientes. Se destacan: depresi&oacute;n mayor y otros cuadros con humor depresivo hasta en un 15% de los casos; euforia o humor maniforme en un 7%; episodios psic&oacute;ticos entre un 5 y 7%; y marcada hipocondriasis en el 10%. Tambi&eacute;n se ha reportado trastorno obsesivo-compulsivo de inusual intensidad entre un 6% y 39% de los casos, siendo la conducta de verificaci&oacute;n la m&aacute;s observada. As&iacute; mismo, puede apreciarse abuso de alcohol con mayor tendencia a accidentes, e incremento del h&aacute;bito de fumar. No obstante la elevada prevalencia de psicopatolog&iacute;a en la DFT, parece ser menos frecuente que en otros tipos de demencia como la EA<Sup>(35-37)</Sup>.</p>      <p align="justify">Al igual que en otros tipos de demencia, se ha encontrado una asociaci&oacute;n entre DFT y Enfermedad de Neurona Motora (ENM)<sup>(38-44)</sup>. Usualmente, los signos de deterioro motor siguen al cl&aacute;sico cuadro de alteraci&oacute;n conductual ya descrito, m&aacute;s pueden acompa&ntilde;arlo en su inicio e incluso en algunos casos preceder al mismo<Sup>(43)</Sup>. Generalmente se presenta debilidad muscular, atrofia con signos de par&aacute;lisis bulbar progresiva, con s&iacute;ntomas poco prominentes de s&iacute;ndrome de neurona motora superior<Sup>(39-43)</Sup>. De igual manera, se han descrito casos ocasionales de hemiparesia progresiva<Sup>(45)</Sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">Curiosamente, el grueso deterioro nigral, evidenciado en la autopsia, contrasta con la ausencia de notables s&iacute;ntomas extrapiramidales; al parecer, la r&aacute;pida progresi&oacute;n y la muerte temprana, calculada en un promedio de 3 a&ntilde;os tras el inicio de los s&iacute;ntomas motores, impide el cabal desarrollo de los mismos<Sup>(39,40)</Sup>.</p>      <p align="justify">Tambi&eacute;n debe distinguirse, la presencia de s&iacute;ntomas de parkinsonismo en la conocida DFTP-17, que como se mencionar&aacute; m&aacute;s adelante, puede ser considerada un subgru-po particular de la DFT<Sup>(46)</Sup>. En ella se observa aplanamiento afectivo, temblor, rigidez, akinesia, trastornos de la marcha y otros tantos signos del cortejo parkinsoniano. Se describen dos grandes formas de presentaci&oacute;n ligadas a la misma alteraci&oacute;n cromos&oacute;mica: Demencia con Degeneraci&oacute;n Palido-Ponto-Nigral y CDDPA <Sup>(47)</Sup>.</p>      <p align="justify">M&aacute;s all&aacute; de estas manifestaciones neurol&oacute;gicas espec&iacute;ficas, en general se podr&iacute;a afirmar que durante las fases tempranas de la DFT el examen neurol&oacute;gico es normal, salvo en algunos casos donde se aprecia presencia de reflejos primitivos como los de &quot;prensi&oacute;n&quot;, &quot;succi&oacute;n&quot; y reflejo plantar de extensi&oacute;n. En algunos pacientes se evidencian fasciculaciones, disartria y disfagia. Ya avanzada la enfermedad, el paciente puede mostrar signos extra-piramidales, inmovilidad con akinesia y rigidez, y en raras ocasiones, hasta accesos convulsivos del tipo de las crisis parciales Del mismo modo, ha sido reportada labilidad tensional con tendencia a la hipotensi&oacute;n<Sup>(2-21)</Sup>.</p>      <p align="justify"><font size="3"><b>CRITERIOS CL&Iacute;NICOS</b></font></p>      <p align="justify">De la extensa experiencia de los grupos de Lund y Manchester, surgen por concenso, los criterios para diagn&oacute;stico cl&iacute;nico de la DFT. En ellos se sistematiza sus manifestaciones a trav&eacute;s de diferentes componentes fenomenol&oacute;gicos, como trastronos de conducta, afectivos, del lenguaje, signos f&iacute;sicos, ex&aacute;menes paracl&iacute;nicos, as&iacute; como las caracter&iacute;sticas que respaldan o excluyen el diagn&oacute;stico <Sup>(12)</Sup>. Respecto a estos criterios, han sido publicados estudios que revelan gran agudeza diagn&oacute;stica, demostrada por SPECT, previa a la autopsia. No obstante, pueden surgir dudas operativas, ya que no se especifica la cantidad y la jerarquizaci&oacute;n de criterios para hacer el diagn&oacute;stico (ver <a href="#tab1">Tabla 1</a>).</p>      <p align="center"><a name="tab1"></a><img src="img/revistas/rcp/v29n2/v29n2a05t1.jpg"></p>      <p align="justify"><font size="3"><b>HALLAZGOS</b></font></p>      <p align="justify"><b>NEUROPSICOL&Oacute;GICOS</b></p>      <p align="justify">Algunos autores han encontrado manifestaciones precoces sutiles que fundamentalmente comprometen el &aacute;rea del lenguaje. Sin embargo, para que se hagan evidentes los s&iacute;ntomas cognitivos, suelen transcurrir meses o a&ntilde;os<Sup>(23-50,51)</Sup>. Aunque resulta inusual, tambi&eacute;n es reportado un discreto compromiso de la memoria, que s&oacute;lo se detectan con m&eacute;todos neuropsicol&oacute;gicos especificos<Sup>(5-17-52)</Sup>. Hasta ya avanzada la afecci&oacute;n, estas alteraciones se pueden ver en el marco de una habilidad visoespacial intacta y una funci&oacute;n intelectual global normal, lo que permite hacer diagn&oacute;stico diferencial con otros tipos de demencia<Sup>(2-16-33-53)</Sup>. Esto se evidencia en la adecuada realizaci&oacute;n de pruebas como la Figura Compleja de Rey-Osterrieth y las Matrices Progresivas de Raven<Sup>(53)</Sup>. Si bien los ex&aacute;menes neuropsicol&oacute;gicos pueden ser sensibles, resultan poco espec&iacute;ficos para diferenciar la DFT de otras afecciones degenerativas que comprometen a las mismas regiones cerebrales <Sup>(48)</Sup>.</p>      <p align="justify">Las alteraciones en el lenguaje se aprecian temprano en la evoluci&oacute;n de la enfermedad. Se caracterizan por un discurso fatuo, vac&iacute;o, carente de espontaneidad y con discreta logopenia; preserv&aacute;ndose la articulaci&oacute;n, fonolog&iacute;a, sintaxis y capacidad de repetici&oacute;n<Sup>(16-21)</Sup>. Tambi&eacute;n, puede existir anomia leve, donde usualmente est&aacute; m&aacute;s comprometida la nominaci&oacute;n de acciones (din&aacute;mica) que la nominaci&oacute;n de objetos (est&aacute;tica). Lo anterior, parece ser una funci&oacute;n del l&oacute;bulo frontal y bien podr&iacute;a servir como par&aacute;metro distintivo de la E A <Sup>(54)</Sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">Ya m&aacute;s avanzada la DFT, se acent&uacute;a el deterioro verbal con aparici&oacute;n de ecolalia y estenotipia de frases, comentarios y sonidos. Algunos autores consideran esto como una afasia din&aacute;mica o transcortical motora, dentro de la clasificaci&oacute;n cl&aacute;sica de los s&iacute;ndromes af&aacute;sicos<sup>(16,53,55)</sup>. Aunque poco comunes, tambien se han descrito, en fases tempranas y medias de la enfermedad, casos de afasia paraf&aacute;sica con fluidez conservada y significante dificultad en la comprensi&oacute;n (afasia de Wernicke), as&iacute; como de afasia transcortical sensorial (afasia sem&aacute;ntica)<sup>(2,16,53,55-57)</sup>. De la misma manera se ha reportado cierta dificultad para  apreciar aspectos sutiles del lenguaje, tales como iron&iacute;a y juego de palabras<Sup>(58)</Sup>. En su fase tard&iacute;a, la DFT evoluciona hacia un progresivo mutismo<Sup>(2-16-21)</Sup>. El deterioro en el lenguaje puede ser evaluado a trav&eacute;s de la subescala verbal del WAIS-R, el Examen Diagn&oacute;stico para Afasias de Boston, y especialmente los Tests de Nominaci&oacute;n Din&aacute;mica, que ofrecen la sensibilidad suficiente para detectar los cambios descritos <Sup>(53)</Sup>.</p>      <p align="justify">Aunque tradicionalmente se afirmaba que en la DFT no hab&iacute;a compromiso de la memoria, recientemente se han reportado dificultades con las estrategias en el uso de informaci&oacute;n, m&aacute;s que con el almacenamiento de la misma <Sup>(2,3-59)</Sup>. La alteraci&oacute;n mn&eacute;sica se hace realmente evidente ya avanzada la enfermedad<sup>(52)</sup>. Se ha informado, en diferentes publicaciones, un compromiso m&aacute;s selectivo de la memoria de trabajo<sup>(2-16)</sup>, del recordar libre y mediante pistas (memoria expl&iacute;cita), as&iacute; como de la curva de aprendizaje; estos hallazgos parecen orientar hacia un mayor deterioro del hipocampo y en apariencia m&aacute;s caracter&iacute;stico de la DFT tipo EP<sup>(53,60)</sup>. Menos espec&iacute;ficos y poco frecuentes, son casos avanzados con compromiso de la memoria epis&oacute;dica y sem&aacute;ntica<sup>(16)</sup>.</p>      <p align="justify">Otras &aacute;reas cognitivas que pueden resultar afectadas son la atenci&oacute;n sostenida, habilidad organizacional (capacidad de planeamiento) y otras funciones ejecutivas, propias<sup>(16-21-24)</sup> del l&oacute;bulo frontal<Sup>(2-58)</Sup>. Resultan sensibles para estos cambios, pruebas neuropsicol&oacute;gicas tales como las Cartas de Wisconsin, Trail Making Test, Test de Stroop y Tests de Fluidez Verbal; donde usual-mente se puede observar marcado compromiso desde las fases tempranas<Sup>(3,16-24-58)</Sup>; del mismo modo, parece ser de utilidad el Test de Estimaciones Cognitivas, instrumento dise&ntilde;ado para evidenciar d&eacute;ficit en la capacidad de juicio y razonamiento <Sup>(61)</Sup>.</p>      <p align="justify">Algunos autores, han encontrado que en formas leves de la enfermedad, se observan alteraciones en los tests destinados a detectar dificultad en la toma de decisiones y en el aprendizaje por discriminaci&oacute;n visual, present&aacute;ndose intactos otros paradigmas relativos a disfunci&oacute;n de la corteza prefrontal<Sup>(62,63)</Sup>. En la fase terminal de la DFT, puede ser vista desorientaci&oacute;n espacial y un deterioro cognitivo global, que dificulta enormemente establecer el diagn&oacute;stico diferencial con otras entidades que cursan con degeneraci&oacute;n cortical<sup>(4,30,52,65-67)</sup> param&eacute;dicos, podr&iacute;a resultar &uacute;til el EXIT25, prueba de breve y f&aacute;cil aplicaci&oacute;n, espec&iacute;fico para funciones ejecutivas, que tiene una sensibilidad cercana al 100% en pacientes con DFT<Sub>(64)</Sub>. Otros tests de evaluaci&oacute;n cognitiva breve como el MMSE, son pobres indicadores de DFT, ya que arrojan altos porcentajes de falsos negativos<Sup>(16-64)</Sup>.</p>      <p align="justify"><font size="3"><b>ANATOM&Iacute;A FUNCIONAL</b></font></p>      <p align="justify">Los matices cl&iacute;nicos de la DFT tienen una correlaci&oacute;n clara con la distribuci&oacute;n funcional del proceso degenerativo a lo largo de un eje longitudinal (anteroposterior) y horizontal (izquierdo-derecho). Al comprometerse los dos l&oacute;bulos frontales y la porci&oacute;n anterior de los temporales, se observa la cl&aacute;sica cl&iacute;nica de la demencia fronto-temporal, con prominentes cambios de conducta y personalidad<sup>(2,16,24,27,68)</sup>.</p>      <p align="justify">Cuando existe distribuci&oacute;n asim&eacute;trica del proceso degenerativo, con atrofia predominante de las regiones frontotemporales izquierdas, puede emerger un s&iacute;ndrome de Afasia Progresiva Primaria (APP), definida corno una alteraci&oacute;n progresiva de la fluidez verbal que conduce al mutismo<Sup>(69,70-72)</Sup>. Al comprometer el l&oacute;bulo temporal izquierdo, se presenta una Demencia Sem&aacute;ntica (DS), entendida como p&eacute;rdida progresiva de los significados de palabras y objetos<Sup>(70-72)</Sup>. La afecci&oacute;n temporal derecha, parece inducir m&aacute;s frecuentemente irritabilidad, impulsividad, alteraciones en la presentaci&oacute;n personal, ideas fijas y limitadas, hipomimia e hiperprosexia<Sup>(73)</Sup>. Una muy rara forma de presentaci&oacute;n, es la Proso-pagnosia Progresiva (dificultad en el reconocimiento facial), donde tambi&eacute;n se ve afectado fundamentalmente el l&oacute;bulo temporal derecho<Sup>(74)</Sup>.</p>      <p align="justify">Como es de esperarse, puede tambi&eacute;n observarse superposici&oacute;n de estos s&iacute;ndromes <Sup>(69,70-72-75)</Sup>. As&iacute; mismo, se ha encontrado emergencia de talento art&iacute;stico en algunos pacientes con DFT, lo cual aparentemente se debe al deterioro funcional de la regi&oacute;n anterior del l&oacute;bulo temporal a expensas del hemisferio dominante, preserv&aacute;ndose buena parte del l&oacute;bulo frontal, especialmente la corteza dorsolateral. La mayor&iacute;a de estos pacientes muestran habilidades visuales conservadas y mayor compromiso de la funci&oacute;n verbal<Sup>(31,32)</Sup>. Ver <a href="#fig1">figura 1</a>.</p>      <p align="center"><a name="fig1"></a><img src="img/revistas/rcp/v29n2/v29n2a05f1.jpg"></p>      <p align="justify"><font size="3"><b>EX&Aacute;MENES PARACL&Iacute;NICOS</b></font></p>      ]]></body>
<body><![CDATA[<p align="justify"><b>ELECTROENCEFALOGRAF&Iacute;A</b></p>      <p align="justify">La mayor&iacute;a de los estudios sostiene que a&uacute;n en fases avanzadas de la enfermedad el EEG resulta normal en un elevado porcentaje de casos, lo que indudablemente tendr&iacute;a importancia en el diagn&oacute;stico diferencial con otro tipo de demencias, especialmente con la EA, donde resultan t&iacute;picas las alteraciones electrofisiol&oacute;gicas<sup>(1,5,8,12,21,22,52,65,66,76)</sup>.</p>      <p align="justify">Fundamentalmente en pacientes con EP avanzada, al igual que en la EA, se han reportado alteraciones electroencefalogr&aacute;ficas, en las que se evidencia disminuci&oacute;n de la actividad alfa, ondas lentas difusas y excepcional actividad parox&iacute;stica con evidencia clinica de convulsiones <Sup>(48,49)</Sup>. Lejos de lo supuesto, la distribuci&oacute;n topogr&aacute;fica de estas alteraciones, no se correlaciona necesariamente con las zonas de atrofia <Sup>(2)</Sup>. Investigaciones recientes, describen registros electroencefalogr&aacute;-ficos cuantitativos en DFT con elevada intensidad theta e interacciones sagitales en bandas de alta frecuencia<sup>(77)</sup>.</p>      <p><b>IMAGEN CEREBRAL</b></p>      <p align="justify">Las im&aacute;genes estructurales como la TAC y RMN de cerebro, muestran en la mayor&iacute;a de los casos atrofia frontal y temporal, con aumento de volumen de los ventr&iacute;culos laterales y predominio de los cuernos anteriores<sup>(2,17,21,48,59,78-82)</sup> (<a href="#fig2">figura 2</a>).</p>      <p align="center"><a name="fig2"></a><img src="img/revistas/rcp/v29n2/v29n2a05f2.jpg"></p>      <p align="justify">Estos hallazgos son poco espec&iacute;ficos y en general imposibilitan la diferenciaci&oacute;n con otras enfermedades que cursan con atrofia fron-totemporal, e incluso con la EA que presenta prominente compromiso de las porciones anteriores del cerebro <Sup>(78,79)</Sup>. Se ha descrito el uso de exposici&oacute;n de superficie hemisf&eacute;rica mediante RMN para valorar el grado y distribuci&oacute;n de atrofia presentada en la DFT, encontr&aacute;ndose una significativa localizaci&oacute;n en regiones anteriores, en <a href="#fig2">Figura 2</a> comparaci&oacute;n con pacientes con EA <Sup>(83)</Sup>. Una publicaci&oacute;n reciente, muestra que la detecci&oacute;n del incremento de intensidad de se&ntilde;al por RMN en la sustancia blanca, en fase T2, puede ser un m&eacute;todo sensible e incluso espec&iacute;fico, que distinge entre DFT y EA<Sup>(84)</Sup>.</p>      <p>Las im&aacute;genes cerebrales funcionales, resultan de especial importancia en la detecci&oacute;n de la disminuci&oacute;n de metabolismo o flujo sanguineo, que afecta selectivamente las regiones anteriores del cerebro, a&uacute;n cuando no se evidencian alteraciones en las im&aacute;genes estructurales<sup>(2,19,48,69,80-82,85-90)</sup>.</p>      <p>Este patr&oacute;n, permite hacer una clara distinci&oacute;n entre la DFT, EA, Demencia Vascular (DV), y sujetos sanos <Sup>(80-86-91)</Sup>. Ver <a href="#fig3">figura 3</a>.</p>      <p align="center"><a name="fig3"></a><img src="img/revistas/rcp/v29n2/v29n2a05f3.jpg"></p>      ]]></body>
<body><![CDATA[<p>Son realmente escasos los estudios realizados con Espectroscopia Prot&oacute;nica por RMN en DFT; es importante mencionar el trabajo publicado en 1997 por Ernst y colaboradores, donde son analizadas de manera cuidadosa las im&aacute;genes por Espectroscopia de Hidr&oacute;geno en 14  pacientes con diagn&oacute;stico de DFT. En general, se encuentra reducci&oacute;n de los componentes N-Acetil-Aspartato y de Glutamato + Glutamina, ambos sugestivos de p&eacute;rdida neuronal; asi como incremento del Mioinositol, en aparente relaci&oacute;n con aumento del contenido glial. Estos hallazgos fueron especialmente notorios en las regiones frontotemporales y se pudo diferenciar, por estos par&aacute;metros, hasta el 92% de los casos con DFT, de los pacientes con EA y sujetos sanos<sup>(92)</sup>.</p>      <p align="justify"><b>CURSO Y PRON&Oacute;STICO</b></p>      <p align="justify">Las series de pacientes estudiadas por Gustafson y col., muestran una sobrevida variable de entre 3 y 17 a&ntilde;os, con una media de 8,1 a&ntilde;os, siendo algo m&aacute;s prolongada (10,5 a&ntilde;os) en los casos para el tipo EP <Sup>(2-21)</Sup>. Este tipo ha sido m&aacute;s estudiado, estableci&eacute;ndose tres grandes fases, en nuestra opini&oacute;n no muy diferentes a las observadas en otros tipos de DFT:</p>  <ol type="1">     <li>Alteraciones de personalidad y conducta con afecci&oacute;n del juicio y trastornos de lenguaje.</li>      <li>Afasia y deterioro cognitivo con relativa conservaci&oacute;n de la memoria y habilidades visoespaciales, y </li>      <li>Deterioro intelectual global, hipokinesia o akinesia, mutismo y relajaci&oacute;n esfinteriana. La muerte usualmente es ocasionada por infecciones de v&iacute;as urinarias, pulmonares o por &uacute;lceras de dec&uacute;bito<Sup>(48)</Sup>.</li>     </ol>      <p align="justify"><b>DIAGN&Oacute;STICO DIFERENCIAL</b></p>      <p align="justify">Los cambios iniciales de conducta y personalidad en ausencia de manifestaciones cognitivas ostensibles, sumado a la presencia de co-morbilidad psiqui&aacute;trica frecuentemente retarda confunde el diagn&oacute;stico de DFT<Sup>(2-21)</Sup>.</p>      <p align="justify">El cl&aacute;sico cuadro cl&iacute;nico de APP se manifiesta como una anomia logo-p&eacute;nica que puede derivar en un compromiso ulterior de la fluidez verbal, con paraf&aacute;sias tanto sem&aacute;nticas como fon&eacute;ticas, pudiendo presentarse como diferentes tipos de afasia expresiva <Sup>(57-94-97)</Sup>, acompa&ntilde;ada o no, de otros trastornos cognitivos<Sub>(56-71-98)</Sup>. La APP est&aacute; ligada a la DFT, y su diferenciaci&oacute;n, si es que cabe, parece estar &uacute;nicamente determinada por la distribuci&oacute;n topogr&aacute;fica de la degeneraci&oacute;n cortical, ya que en principio, ambas entidades forman parte de la misma atrofia lobar, presentando quiz&aacute;, un espectro histopatol&oacute;gico com&uacute;n<sup>(7,9,12,56,100,101)</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">Se ha pensado que la DS podr&iacute;a formar parte del espectro de la DFT, aunque a&uacute;n resultan poco claras sus caracter&iacute;sticas<sup>(103)</sup> neuropatol&oacute;gicas y etiol&oacute;gicas<sup>(2-102)</sup>. En general, es materia de controversia el estatus nosol&oacute;gico de la relaci&oacute;n DFT-ENM. Mientras algunos autores sostienen que se trata de enfermedades independientes e intercurrentes<Sup>(43,44)</Sup>, otros plantean una interfase entre la DFT y la ENM cl&aacute;sica sin demencia <Sup>(38,39)</Sup>. As&iacute; mismo, se discute la existencia real de esta &uacute;ltima entidad, ya que a&uacute;n cuando no se observan manifestaciones cognitivas, se han descrito alteraciones sutiles en las pruebas neuropsicol&oacute;gicas destinadas a evaluar el l&oacute;bulo frontal <Sup>(39,40)</Sup>. De hecho, actualmente toma fuerza la hip&oacute;tesis de una superposici&oacute;n gen&eacute;tica o al menos neuropatol&oacute;gica y hasta cl&iacute;nica de ambas entidades <Sup>(9)</Sup>. Tambi&eacute;n, se ha encontrado una asociaci&oacute;n entre la Afasia Progresiva Primaria (APP) y la ENM<Sup>(104)</Sup>.</p>      <p align="justify">En la DCB, el diagn&oacute;stico diferencial no es complicado cl&iacute;nicamente, ya que se observa akinesia y rigidez progresiva de las extremidades, adem&aacute;s de diston&iacute;a, mioclo-nus, trastornos de la marcha y el equilibrio, apraxia y fen&oacute;meno del &quot;miembro ajeno&quot; <Sup>(105)</Sup>.</p>      <p align="justify">Por otra parte, la ausencia de compromiso oculomotor, permite realizar diagn&oacute;stico diferencial con la PSP <Sup>(2-9)</Sup>.</p>      <p align="justify">No parece complicada la distinci&oacute;n de la DV, ya que aunque esta se pueda limitar tempranamente a las regiones anteriores del cerebro, el inicio tiende a ser m&aacute;s agudo, la cl&iacute;nica de mayor intensidad y usual-mente las im&aacute;genes estructurales y funcionales dan un patr&oacute;n espec&iacute;fico de distribuci&oacute;n no uniforme (&quot;parches&quot;)<Sup>(106,107)</Sup>.</p>      <p align="justify">Si bien la mayor&iacute;a de los autores concuerdan en que la EA y la DFT son entidades claramente diferenciables <Sup>(3-23,24-108)</Sup>, ocasionalmente, los pacientes con EA se presentan con cambios conductuales y compromiso funcional con un predominio frontal detectado por SPECT <Sup>(87)</Sup>. A&uacute;n m&aacute;s, cuando la DFT se encuentra en fase avanzada con severo d&eacute;ficit cognitivo, resulta dif&iacute;cil diferenciarla de la EA w&amp;tww. por el contrario, hay trabajos que aseguran que es posible realizar un diagn&oacute;stico diferencial a trav&eacute;s de un adecuado an&aacute;lisis fenomenol&oacute;gico retrospectivo, basado en los cambios conductuales y s&iacute;ntomas psiqui&aacute;tricos, sin tomar en cuenta variables cognitivas<Sup>(26-12)</Sup>. Incluso, se propone que las diferencias conductuales y cognitivas entre ambas entidades no est&aacute;n directamente relacionadas con la severidad de la demencia, siendo estas estables durante su curso <Sup>(24)</Sup>.</p>      <p align="justify">En las manifestaciones sintom&aacute;ticas, resulta espec&iacute;fico de DFT, la presencia de conducta regresiva e impulsividad, descuido personal, trastornos de la ingesta, conducta perseverativa y reducci&oacute;n de lenguaje <Sup>(24-113)</Sup>. Por otra parte en la la EA, apenas se aprecia baja motivaci&oacute;n y enlentecimiento; estas variables parecen ser tanto o m&aacute;s sensibles que las im&aacute;genes funcionales cuando se plantea una diferenciaci&oacute;n entre ambas afecciones<Sup>(24)</Sup>.</p>      <p align="justify">En contraste con el curso habitual de la DFT, en la EA se observa un deterioro cognitivo temprano, fundamentalmente de la memoria epis&oacute;dica anter&oacute;grada, memoria sem&aacute;ntica y de las habilidades visoes-paciales, a las que gradualmente se suman afasia amn&eacute;stica, agnosia, apraxia y dificultades en lectoescritura<sup>(3-16-114,115)</sup>. Los s&iacute;ntomas conductuales propios de deterioro frontal, tales como inquietud, agitaci&oacute;n, impulsividad y ocasionalmente elementos del s&iacute;ndrome de Kl&uuml;ver-Bucy, se observan en fases avanzadas de la EA <Sup>(5-16-51)</Sup>. Como claro elemento diferencial con la DFT, las im&aacute;genes cerebrales de la EA en su aspecto funcional y estructural, revelan inicialmente, mayor compromiso temporoparietal bilateral, con notable hipoperfusion e hipometabolismo de estas regiones<sup>16-117</sup>. (<a href="#tab2">Tabla 2</a>)</p>      <p align="center"><a name="tab2"></a><img src="img/revistas/rcp/v29n2/v29n2a05t2.jpg"></p>      <p><font size="3"><b>ANATOM&Iacute;A PATOL&Oacute;GICA</b></font></p>      <p><b>HALLAZGOS MACROSC&Oacute;PICOS</b></p>      ]]></body>
<body><![CDATA[<p>Como cambio inespec&iacute;fico, se describe atrofia cerebral, la cual resulta m&aacute;s marcada en los l&oacute;bulos frontales y la porci&oacute;n anterior de los l&oacute;bulos temporales, pero que excepcionalmente puede afectar la porci&oacute;n posterior de estos &uacute;ltimos, as&iacute; como los l&oacute;bulos apri&eacute;tales, respetando siempre las regiones occipitales<sup>(9,18,43,68,119)</sup>. La atrofia cort&iacute;cal descrita para el tipo histol&oacute;gico denominado &quot;Degeneraci&oacute;n del L&oacute;bulo Frontal&quot;, resulta leve y menos circunscrita que para el tipo &quot;EP&quot;, donde puede verse marcada atrofia frontotemporal, incluso de la variedad conocida como &quot;filo de cuchillo&quot; <Sup>(2-21)</Sup>. En la EP ha sido descrita una variante generalizada con extensi&oacute;n del proceso degenerativo al n&uacute;cleo caudado y que suele comezar a edades m&aacute;s tempranas(48,120) del mismo modo, en la DFT + ENM, se ha descrito menor extensi&oacute;n de la atrofia<Sup>(68)</Sup>. T&iacute;picamente, se presenta dilataci&oacute;n de los ventr&iacute;culos laterales, particularmente en sus cuernos frontales <Sup>(10)</Sup>. Aunque inusuales, se ven cambios macrosc&oacute;picos en los ganglios b&aacute;sales, t&aacute;lamo, am&iacute;gdala e hipocampo<sup>(2,9,21,68)</sup>. La ausencia de atrofia del hipocampo, detectada por resonancia magn&eacute;tica volum&eacute;trica, podr&iacute;a ser un par&aacute;metro que permite diferenciar DFT de EA<Sup>(121)</Sup>.</p>      <p align="justify"><b>HALLAZGOS MICROSC&Oacute;PICOS</b></p>      <p align="justify">En general, se presenta importante p&eacute;rdida neuronal, cambios espongiformes y marcada gliosis, primordialmente distribuidos en las capas superficiales de la corteza frontotemporal<sup>(2.9,12,21,68,94,119,122)</sup>. Estos cambios se observan en especial en la convexidad frontal (en su circunvoluci&oacute;n media), l&oacute;bulo de la &iacute;nsula, regi&oacute;n anterior del c&iacute;ngulo y porci&oacute;n anterior de los l&oacute;bulos temporales <Sup>(3-10)</Sup>.</p>      <p align="justify">Hay desacuerdo con respecto al estado del hipocampo, ya que algunos autores proponen degeneraci&oacute;n con p&eacute;rdida neuronal variable, principalmente en las regiones CA&Iacute; y del subiculum<Sup>(8-119)</Sup>, mientras otros aseguran que esta estructura est&aacute; casi indemne, tan solo con escasa astrocitosis<Sup>(3)</Sup>. En casos excepcionales se observa discreto compromiso del cuerpo estriado, n&uacute;cleos b&aacute;sales, locus cer&uacute;leo y porciones posteriores del cerebro <Sup>(2,8-9)</Sup>.</p>      <p align="justify">El estudio celular revela p&eacute;rdida y estrechamiento neuronal, fundamentalmente a expensas de las c&eacute;lulas piramidales, pudi&eacute;ndo estar presentes, como signos de degeneraci&oacute;n, estrechas &quot;neuronas fantasmas&quot; y fragmentaci&oacute;n neuronal con manchas hipocr&oacute;micas <Sup>(2,9-12)</Sup>. Del mismo modo, se ha documentado compromiso sin&aacute;ptico importante, con reducci&oacute;n cuantitativa<sup>(122)</sup>, adem&aacute;s de degeneraci&oacute;n esferoidal de los terminales presin&aacute;pticos<Sup>(106)</Sup>. Al parecer, la astrocitosis puede ser notable, pudi&eacute;ndo encontrar correlato en altos los niveles de SlOObeta, una prote&iacute;na ligada al calcio, encontrada en los astrocitos<sup>(106)</sup>. Cambios del tipo EA est&aacute;n ausentes salvo ocasionalmente en pacientes de edad avanzada<Sup>(119)</Sup>.</p>      <p>Las c&eacute;lulas de Pick, presentes espec&iacute;ficamente en el tipo hom&oacute;nimo de DFT<Sup>(9)</Sup>, se observan con mayor frecuencia en hipocampo y am&iacute;gdala, como c&eacute;lulas &quot;infladas&quot; o &quot;abalonadas&quot; en proceso de cromatolisis y con n&uacute;cleo desplazado. Del mismo modo, pueden hallarse inclusiones intracitoplasm&aacute;ticas densas (Cuerpos de Pick), sin correlaci&oacute;n con part&iacute;culas virales <Sup>(48)</Sup>. Aunque resulta motivo de controversia, los cuerpos de Pick no son condici&oacute;n sine qua non para el diagn&oacute;stico de la enfermedad <Sup>(123)</Sup>.</p>      <p>M&aacute;s all&aacute; de la distribuci&oacute;n topogr&aacute;fica, realmente son escasas las diferencias neuropatol&oacute;gicas entre la DFT y la asociaci&oacute;n DFT-ENM, observ&aacute;ndose en esta &uacute;ltima, cambios m&aacute;s extensos en localizaciones subcorticales (estriatum, t&aacute;lamo y sustancia nigra). Como es de esperarse, est&aacute;n involucradas las neuronas motoras superiores e inferiores, cuesti&oacute;n que se evidencia por una degeneraci&oacute;n en los tractos piramidales medulares. Tambi&eacute;n se ha descrito p&eacute;rdida de las neuronas motoras en los cuernos anteriores en la m&eacute;dula espinal, as&iacute; como en el n&uacute;cleo del hipogloso<Sup>(9-25,39)</Sup>. Del mismo modo, las c&eacute;lulas de Betz en la corteza motora est&aacute;n desaparecidas o seriamente estrechadas<sup>(39,104)</sup>.  El ENM, se encuentran preservados los n&uacute;cleos b&aacute;sales de Meynert, el locus cer&uacute;leo y el rafe dorsal, y no es posible evidenciar cuerpos de Lewy, de Pick u ovillos neurofibrilares (ONF). Las placas argirof&iacute;licas son escasas o est&aacute;n tambi&eacute;n ausentes<sup>(39,56,104)</sup>.</p>      <p>En la DFTP-17, se ha descrito atrofia de la corteza frontal y temporal, as&iacute; como de los ganglios b&aacute;sales y sustancia negra. En la mayor&iacute;a de los casos, estos hallazgos se acompa&ntilde;an de de p&eacute;rdida neuro-nal y gliosis <Sup>(46-124)</Sup>. La APP resulta poco espec&iacute;fica, puediendo presentar lesiones similares a la DFT con o sin cuerpos de Pick, patolog&iacute;a propia de la EA u otros cambios no espec&iacute;ficos con o sin inclusiones tipo Enfermedad Difusa por Cuerpos de Lewy, DCB (ws.ioo.iou&#094; Lo anterior, parece definir la APP como un s&iacute;ndrome cl&iacute;nico, m&aacute;s que como una entidad nosol&oacute;gica particular.</p>      <p><b>INMUNOQU&Iacute;MICA</b></p>      <p>El &aacute;rea de la inmunohistoqu&iacute;mica promete la posibilidad de reclasifi-car al s&iacute;ndrome a&uacute;n oscuro de la DFT, arrojando adem&aacute;s luces a su etiolog&iacute;a y fisiopatolog&iacute;a.</p>      ]]></body>
<body><![CDATA[<p>En la DFT tipo &quot;Degeneraci&oacute;n Frontal&quot; est&aacute;n ausentes los ONF, as&iacute; como tambi&eacute;n las placas argirof&iacute;licas o est&aacute;n presentes en escasa cantidad, lo que tradicionalmente le ha conferido la nominaci&oacute;n: &quot;sin histolog&iacute;a distintiva&quot; <Sup>(9)</Sup>. M&aacute;s actualmente, se sabe que pueden observarse neuronas corticales &quot;infladas&quot; que resultan aB cristalina reactivas<Sup>(126,127)</Sup>, adem&aacute;s de reacci&oacute;n tau y betatubulina positiva en los esferoides degenerativos observados en algunos terminales presin&aacute;pticos, lo que parece obligar a una reconsideraci&oacute;n de esta denominaci&oacute;n inicial<Sup>(106-128)</Sup>. En la asociaci&oacute;n DFT-ENM, se evidencian inclusiones de ubiquitina negativas para tau y aB cristalina, distribuidas en de la corteza frontal, giro dentado del hipocampo, as&iacute; como, en las c&eacute;lulas nigrales, neuronas hipoglosales y espinomotoras<sup>(12,40,119,129,130)</sup>.</p>      <p align="justify">En la DFTP-17 est&aacute;n presentes ONF-tau positivos localizados en las neuronas y c&eacute;lulas gliales afectadas, pero con ausencia de dep&oacute;sitos de b amiloide, caracter&iacute;stica propia de la EA.</p>      <p align="justify">En el tipo EP, los cuerpos y c&eacute;lulas de Pick, son inmunorreactivas para tau, ubiquitina, cromogranina A y plasma B cristalina. Del mismo modo, pueden observarse ONF-tau positivos al igual que en la EA, pero diferiendo de &eacute;sta, en la composici&oacute;n de la tau aberrante (55 y 64 kDa doublet)<sup>(128-131)</sup>.</p>      <p align="justify">Lo expuesto, permite realizar diagn&oacute;stico diferencial entre patolog&iacute;a demencial, as&iacute; los cuerpos y c&eacute;lulas de Pick, con sus caracter&iacute;sticas propias, pueden ser distinguidos de los cuerpos y c&eacute;lulas de Lewys y de las c&eacute;lulas infladas de la PSP <Sup>(132)</Sup>. En la misma l&iacute;nea, como se mencion&oacute; anteriormente, la prote&iacute;na tau aberrante presente en muchas de estas entidades, puede tener caracter&iacute;sticas espec&iacute;ficas distintivas en la DFTP-17, EA, PSP y Enfermedad Difusa por Cuerpos de Lewys<Sup>(128,131,2)</Sup>.</p>      <p align="justify"><b>CRITERIOS DIAGN&Oacute;STICOS HISTOPATOL&Oacute;GICOS</b></p>      <p align="justify">El grupo de Lund-Manchester en 1994, establece sin mayor significaci&oacute;n etiol&oacute;gica, tres grandes patrones histol&oacute;gicos descriptivos dentro de la DFT:</p>  <ol> <li align="justify">Tipo Degeneraci&oacute;n Frontal.</li>  <li align="justify">Tipo EP, y</li>  <li align="justify">Tipo ENM; aclarando que futuros estudios podr&iacute;an definir un patr&oacute;n gen&eacute;tico que englobe estos tipos como un espectro etiol&oacute;gico, o por el contrario, que cada una de estas manifestaciones histopatol&oacute;-gicas llegue a reflejar distintos procesos, gobernados por mecanismos gen&eacute;ticos o moleculares particulares<sup>(12)</sup> (<a href="#tab3">Tabla 3</a>).</li>     </ol>      <p align="center"><a name="tab3"></a><img src="img/revistas/rcp/v29n2/v29n2a05t3.jpg"></p>      <p align="justify">En 1996 el grupo de neuropatolog&iacute;a de la Salpetriere (Par&iacute;s), propone una forma simplificada de criterios diagn&oacute;sticos histopatol&oacute;gicos para DFT:</p>  <ol> <li align="justify">Si existe una atrofia frontotemporal severa, con marcada p&eacute;rdida neuronal y astrocitosis, numerosas c&eacute;lulas infladas y caracter&iacute;sticas inclusiones tau y ubiquitina positivas el diagn&oacute;stico ser&aacute; de EP.</li>      <li>Signos de compromiso motor (muchas veces no notados por el cl&iacute;nico) con leve atrofia cortical y escasa espongiosis de las capas II y III, garantizan el diagn&oacute;stico de degeneraci&oacute;n de DFT-ENM. Las inclusiones ubiquitina positiva pueden ser &uacute;tiles marcadores espec&iacute;ficos.</li>      ]]></body>
<body><![CDATA[<li>Cuando no existen ni inclusiones de Pick, ni ENM, el diagn&oacute;stico puede ser DFSHD <Sup>(95)</Sup>.</li>     </ol>      <p><font size="3"><b>ETIOLOG&Iacute;A</b></font></p>      <p>La mayor&iacute;a de los estudios en esta &aacute;rea se han desarrollado en el campo gen&eacute;tico. Resulta desconcertante la literatura a este respecto, con un espectro que va desde la propuesta de la DFT como una afecci&oacute;n espor&aacute;dica sin una fuerte historia familiar <Sup>(33-135)</Sup>, hasta autores que asumen de manera m&aacute;s categ&oacute;rica el origen gen&eacute;tico del problema, proponiendo adem&aacute;s a la DFT como una simple expresi&oacute;n fenot&iacute;pica de un grupo mayor de patololog&iacute;as con un mismo sustrato genot&iacute;pico<Sup>(13-136)</Sup>. En reportes recientes, se ha documentado que cuando se tienen familiares en primer grado con DFT, se presenta un riesgo hasta 3,5 veces mayor que la poblaci&oacute;n general de padecer esta entidad<Sup>(137)</Sup>; considerando que la forma familiar de DFT, ser&iacute;a hede-rada siguiendo un patr&oacute;n autos&oacute;mico dominante<sup>(138)</sup>.</p>      <p align="justify">El hallazgo m&aacute;s consistente en los diversos trabajos, es relaci&oacute;n entre alteraciones en el cromosoma 17 y algunos tipos de DFT que cursan con s&iacute;ntomas motores. Dicha relaci&oacute;n parece comprometer espec&iacute;ficamente al locus 17<sup>(21-22)</sup>, segmento responsable de la s&iacute;ntesis de la prote&iacute;na microtubular tau<sup>(10,48,133,135,136,139-142)</sup>. Recientemente, se ha denominado este particular subgrupo como Demencia Ponto-temporal con Parkinsonismo ligada al cromosoma 17 (DFTP-17), heredada como entidad autos&oacute;mica dominante<Sup>(133)</Sup> y que se incluye dentro de la interesante clasificaci&oacute;n naciente de las taupatolog&iacute;as, caracterizadas por la presencia de inclusiones ricas en formas de fosforilaci&oacute;n aberrante de esta prote&iacute;na &lt;<Sup>13</Sup>'<Sup>46</Sup>&gt;.</font></font></p>      <p align="justify">micialmente, los estudios gen&eacute;ticos fueron realizados con cuadros cl&iacute;nicos de diferente denominaci&oacute;n, teniendo como elemento com&uacute;n el de tener DFT entre sus manifestaciones patol&oacute;gicas: EP, DFT con Enfermedad de Neurona Motora, (DFT-ENM)<sup>(133-134)</sup> CDDPA<sup>(10-139)</sup>, DHDD<Sup>(11)</Sup>. Por otra parte, inclusiones o dep&oacute;sitos de tau pueden observarse tambi&eacute;n en patolog&iacute;as que t&iacute;picamente cursan sin DFT como la Esclerosis Lateral Amiotr&oacute;fica de Guam/Complejo De-mencia-Parkinsonismo, PSP, DCB; existiendo algunas publicaciones que reportan ocasional superposici&oacute;n cl&iacute;nica de estas afecciones con la DFT<Sup>(136)</Sup>; lo que ha permitido hacer la inferencia de un origen gen&eacute;tico com&uacute;n, con diferentes manifestaciones fenot&iacute;picas probablemente derivadas de mutaciones dentro del mismo segmento cro-mos&oacute;mico <Sup>(13-133)</Sup>. En la misma l&iacute;nea de investigaci&oacute;n, se ha descrito recientemente la asociaci&oacute;n entre el cromosoma 19, espec&iacute;ficamente el locus 19ql3 y la Osteodisplasia Lipomembranosa Poliqu&iacute;stica con Leucoencefalopat&iacute;a Esclerosante; enfermedad hereditaria recesiva de escasa incidencia, caracterizada por quistes &oacute;seos sist&eacute;micos y DFT presenil progresiva, que ocasiona muerte temprana en las personas que la padecen<sup>(144)</sup>. As&iacute; mismo, recientemente se implica una porci&oacute;n del cromosoma 3 <Sup>(145)</Sup>.</p>      <p align="justify">Aunque existen elementos cl&iacute;nicos e histol&oacute;gicos comunes entre la DFT y la enfermedad por priones<Sup>(146)</Sup>, no se ha encontrado v&iacute;nculo gen&eacute;tico entre estas entidades <Sup>(147)</Sup>.</p>      <p align="justify">Otro aspecto de inusitado inter&eacute;s, es el riesgo de padecer DFT ante la presencia del gen de la apoliprote&iacute;na E, siendo dicha prote&iacute;na, como es sabido, un hallazgo propio de la EA &lt;<Sup>(148,149)</Sup>. Esta proposici&oacute;n resulta a&uacute;n poco consistente, ya que hay autores que afirman exactamente lo contrario<Sup>(150)</Sup>.</p>      <p align="justify">Al igual que en otras enfermedades degenerativas, se ha pensado que el estr&eacute;s oxidativo podr&iacute;a jugar un rol en la g&eacute;nesis de la DFT <Sup>(151)</Sup>.</p>      <p align="justify"><font size="3"><b>TRATAMIENTO</b></font></p>      ]]></body>
<body><![CDATA[<p align="justify">Existen pocas publicaciones destinadas espec&iacute;ficamente al tratamiento farmacol&oacute;gico de la DFT; hay un reporte de dos casos de DFT con depresi&oacute;n que han respondido a tratamiento con litio y paroxeti-na, probablemente por incremento de la actividad serotonin&eacute;rgica postsin&aacute;ptica <Sup>(152)</Sup>. El protocolo con mayor numero de casos hasta ahora publicado, es un estudio abierto con 11 pacientes tratados con ISRS (Fluoxetina, Sertralina o Paroxetina), encontr&aacute;ndose mejor&iacute;a significativa, al menos en la mitad de los sujetos, de los s&iacute;ntomas depresivos, compulsiones, desinhibici&oacute;n y deseos de consumir carbohidratos<Sup>(153)</Sup>. Existen estudios realizados con Idaxozan (un agonista selectivo a2 adren&eacute;rgico) que muestran importante mejor&iacute;a de funciones ejecutivas y memoria epis&oacute;dica con incremento del d&eacute;ficit de memoria de trabajo en los pacientes con DFT<sup>(154,155)</sup>.</p>      <p align="justify">Basado en el hallazgo de disminuci&oacute;n de difosfato de tiamina en la corteza frontal de pacientes con DFT, y en la consabida necesidad de esta sustancia para la s&iacute;ntesis de neurotransmisores, hay autores que proponen emplear tiamina en estudios terap&eacute;uticos, pero esto no ha sido hasta el momento explorado<sup>(156)</sup>.</p>      <p align="justify">El manejo de las DFT, es pues aun poco claro y esperanzador pues ademas de f&aacute;rmacos dirigidos a mejorar algunas de las manifestaciones psiqui&aacute;tricas no hay datos acerca de tratamientos espec&iacute;ficos para los s&iacute;ntomas demenciales. Se espera que con los estudios de la etiolog&iacute;a y la fisiopatolog&iacute;a de la en fermedad se desarrollen alternativas  terap&eacute;uticas que permitan mejorar  su pron&oacute;stico.</p>  <hr>      <p><font size="3"><b>REFERENCIAS</b></font></p>      <!-- ref --><p>1. Kertesz A. Arnold Pick: A historical introduction. En: Pick's disease and Pick's complex (A Kertesz &amp; D Mu&ntilde;oz eds); Wiley-Liss, NY, 1998:13-21.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000117&pid=S0034-7450200000020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Lyshman WA: Senile Dementias, Presenile Dementias and Pseudodementias. En: Organic Psychiatry: The Psychological Consecuences of Cerebral Disorder de WA Lyshman. Ed. Blackwell Science, Inc. 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<ref-list>
<ref id="B1">
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<person-group person-group-type="author">
<name>
<surname><![CDATA[Kertesz]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
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