<?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>0121-8123</journal-id>
<journal-title><![CDATA[Revista Colombiana de Reumatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Reumatol.]]></abbrev-journal-title>
<issn>0121-8123</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Reumatología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-81232009000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Enfermedad de Behcet]]></article-title>
<article-title xml:lang="en"><![CDATA[Behcet's disease]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toro Giraldo]]></surname>
<given-names><![CDATA[Ana Milena]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinto Peñaranda]]></surname>
<given-names><![CDATA[Luis Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez Franco]]></surname>
<given-names><![CDATA[Carlos Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez Hernández]]></surname>
<given-names><![CDATA[Javier Darío]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Pontificia Bolivariana Docente de dermatología ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Pontificia Bolivariana Profesor Asociado ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2009</year>
</pub-date>
<volume>16</volume>
<numero>1</numero>
<fpage>97</fpage>
<lpage>111</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-81232009000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-81232009000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-81232009000100007&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p><font size=2 face="verdana"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>      <p>    <center><font size=4 face="verdana"><b>Enfermedad de Behcet</b></p>      <p><b>Behcet's disease</b></p>      <p><font size=2 face=verdana>Ana Milena Toro Giraldo<sup>1</sup>, Luis Fernando Pinto Pe&ntilde;aranda<sup>2</sup>,    <br> Carlos Jaime Vel&aacute;squez Franco<sup>2</sup>, Javier Dar&iacute;o M&aacute;rquez Hern&aacute;ndez<sup>2</sup></center></p>      <p><sup>1</sup> Dermat&oacute;loga - Docente de dermatolog&iacute;a, Universidad Pontificia Bolivariana, Medell&iacute;n, Colombia.    <br> <sup>2</sup> Reumat&oacute;logo del Hospital Pablo Tob&oacute;n Uribe y Profesor Asociado de la Universidad Pontificia Bolivariana, Medell&iacute;n, Colombia.</p>      <p>Recibido: Noviembre 15/2008 Aceptado: Febrero 5/2009</font></p>  <hr>  <font size=3 face="verdana">      <p>La enfermedad de Behcet (EB) es una enfermedad multisist&eacute;mica de causa desconocida, caracterizada por un curso cr&oacute;nico, recurrente y compromiso inflamatorio de los vasos de todos los calibres. Los principales hallazgos cl&iacute;nicos incluyen: aftas orales y genitales, artritis, lesiones cut&aacute;neas, manifestaciones oculares, gastrointestinales y neurol&oacute;gicas<sup>1-7</sup>.</p>      ]]></body>
<body><![CDATA[<p><b>Historia</b><sup>4</sup></p>      <p>La primera descripci&oacute;n de la sintomatolog&iacute;a de la enfermedad fue publicada por Hip&oacute;crates, en el siglo V antes de Cristo, en su tercer libro de epidemiolog&iacute;a<sup>8</sup>:</p>      <p>"There were other forms of fever... Many developed aphtae, ulcerations. Many ulcerations about the genital parts... Watery ophtalmies of a chronic character, with pains; fungus excretions of the eyelids externally, internally, which destroyed the sight of many persons... there were fungous growths on ulcers, and on those localized on the genital organs. Many anthraxes through the summer... other great affections: many large herpetes".</p>      <p>A principios del siglo XX, Bl&uuml;the, Planner, Remenovsky y Shigeta reconocieron la tr&iacute;ada de iritis, &uacute;lceras mucocut&aacute;neas y genitales.</p>      <p>En 1930, Adamantiades present&oacute; a la sociedad m&eacute;dica de Atenas el caso de un paciente de 20 a&ntilde;os de edad quien desarroll&oacute; iritis recurrente con p&eacute;rdida de la visi&oacute;n, flebitis, ulceraciones genitales, orales y artritis en la rodilla, el cual fue publicado un a&ntilde;o despu&eacute;s.</p>      <p>En 1924, el dermat&oacute;logo turco Hulusi Beh&ccedil;et examin&oacute; un paciente con historia de estomatitis aftosa recurrente, &uacute;lceras genitales, eritema nodoso y afecci&oacute;n ocular; en los siguientes 12 a&ntilde;os evalu&oacute; varios casos similares, los cuales fueron publicados en 1937 y a partir de entonces este s&iacute;ndrome fue reconocido con el nombre de enfermedad de Behcet.</p>      <p><b>Epidemiolog&iacute;a</b></p>      <p>La EB tiene una distribuci&oacute;n mundial; sin embargo, su prevalencia var&iacute;a mucho seg&uacute;n la ubicaci&oacute;n geogr&aacute;fica (<a href="#tab1">Tabla 1</a>), siendo mayor en los pa&iacute;ses correspondientes con la antigua ruta de la seda y menor en el norte de Europa, Estados Unidos e Inglaterra<sup>1,5,7</sup>.</p>      <p>    <center><a name="tab1"></a><img src="img/revistas/rcre/v16n1/v16n1a07t1.jpg"></center></p>      ]]></body>
<body><![CDATA[<p>La edad promedio de inicio de los s&iacute;ntomas var&iacute;a entre los 20 y 40 a&ntilde;os y rara vez inicia en ni&ntilde;os y en ancianos<sup>1,5</sup>. La prevalencia por g&eacute;neros es variable; en el medio oriente predomina en hombres, con una relaci&oacute;n hombre / mujer de 3,8: 1 en Israel, 5,3: 1 en Egipto y 3,4: 1 en Turqu&iacute;a. En Alemania, Jap&oacute;n y Brasil existe un ligero predominio femenino, y en Estados Unidos la relaci&oacute;n mujer / hombre es de 5:1.</p>      <p>La &uacute;nica serie publicada en Colombia muestra un predominio del g&eacute;nero femenino (8,7:1), una edad al diagn&oacute;stico de 45 a&ntilde;os (36-52,5) y un a&ntilde;o de retardo entre el primer s&iacute;ntoma y el diagn&oacute;stico de EB<sup>16</sup>.</p>      <p>La gravedad de la enfermedad es mayor en los hombres<sup>9,17</sup>, quienes tienen mayor probabilidad de desarrollar aneurismas, afecci&oacute;n ocular, tromboflebitis y enfermedad neurol&oacute;gica; mientras que en las mujeres es m&aacute;s frecuente el eritema nodoso<sup>9</sup>.</p>      <p>La EB es poco com&uacute;n en pacientes de raza negra y en ellos predomina m&aacute;s el compromiso mucocut&aacute;neo<sup>18</sup>.</p>      <p><b>Patog&eacute;nesis</b></p>      <p>La patog&eacute;nesis de la EB es desconocida. Se ha relacionado con la presencia de anormalidades inmunol&oacute;gicas, posiblemente inducidas por agentes infecciosos o ambientales en individuos gen&eacute;ticamente susceptibles. Hallazgos recientes han soportado la importancia de los factores gen&eacute;ticos y han permitido definir mejor la naturaleza de la inflamaci&oacute;n en esta entidad<sup>19</sup>.</p>      <p><b>Susceptibilidad gen&eacute;tica</b></p>      <p>La EB no se hereda con un modelo de transmisi&oacute;n mendeliano. La mayor&iacute;a de los casos son espor&aacute;dicos. Sin embargo, se han identificado varios casos de agregaci&oacute;n familiar con un riesgo elevado de enfermedad entre los familiares de primer grado<sup>19-22</sup>. El an&aacute;lisis de dichos casos ha soportado la existencia de un complejo modelo de transmisi&oacute;n, con anticipaci&oacute;n gen&eacute;tica (enfermedad de inicio m&aacute;s temprano) en las generaciones sucesivas<sup>23,24</sup>. Asimismo, se ha encontrado que la prevalencia de HLA-B51 es mucho m&aacute;s alta que en los casos espor&aacute;dicos<sup>20</sup>.</p>      <p>La asociaci&oacute;n de la EB con la presencia de HLA-B51 constituye la evidencia m&aacute;s fuerte que involucra los factores gen&eacute;ticos en su patog&eacute;nesis. Ha sido largamente investigado si el HLA-B51 desempe&ntilde;a un papel directo en su patog&eacute;nesis o si esta asociaci&oacute;n refleja un desequilibrio de uni&oacute;n con un gen de susceptibilidad para la EB localizado cerca al locus del HLA-B. El gen del TNF y el gen de la linfotoxina, los cuales est&aacute;n localizados centrom&eacute;ricos al HLA-B, han sido el blanco de atenci&oacute;n como posibles candidatos para susceptibilidad a la enfermedad de Behcet<sup>19</sup>.</p>      <p>La investigaci&oacute;n del segmento gen&oacute;mico entre el TNF y el locus del HLA-B revel&oacute; una asociaci&oacute;n m&aacute;s fuerte de la EB con el gen MICA (MHC class I chain related gene A); este gen es expresado en fibroblastos, c&eacute;lulas epiteliales, c&eacute;lulas endoteliales y monocitos. Se propuso inicialmente que este patr&oacute;n de expresi&oacute;n pod&iacute;a explicar los sitios de inflamaci&oacute;n y que la presentaci&oacute;n antig&eacute;nica por las mol&eacute;culas MICA a las c&eacute;lulas T, la cual est&aacute; aumentada en la EB, pudiera ser un mecanismo patog&eacute;nico importante. Sin embargo, se ha demostrado que los polimorfismos de la mol&eacute;cula MICA no tienen un papel en la presentaci&oacute;n antig&eacute;nica a las c&eacute;lulas T en el epitelio intestinal y que el ant&iacute;geno MICA no parece estar expresado en la membrana celular de los queratinocitos y monocitos, a pesar de la detecci&oacute;n de RNAm<sup>19,25</sup>.</p>      ]]></body>
<body><![CDATA[<p>Estudios de mapeo usando microsat&eacute;lites altamente polim&oacute;rficos confirmaron la regi&oacute;n cr&iacute;tica para la EB como el segmento de 46kb entre el locus MICA y el HLA-B<sup>26</sup>. Estudios de asociaci&oacute;n al&eacute;lica, diferenciaci&oacute;n genot&iacute;pica y an&aacute;lisis de estratificaci&oacute;n en diferentes grupos &eacute;tnicos han probado que el HLA-B51 es el que muestra m&aacute;s fuerte asociaci&oacute;n con la EB y todas las otras asociaciones, incluyendo el MICA, son debidas a un desequilibrio de uni&oacute;n con el HLA-B51<sup>13,27,28</sup>. Sin embargo, este desequilibrio de uni&oacute;n puede extenderse distancias muy largas dentro de la regi&oacute;n del MICA y es a&uacute;n dif&iacute;cil valorar los efectos suplementarios del gen MICA o los otros genes vecinos en la susceptibilidad a la enfermedad<sup>19</sup>.</p>      <p>Diferentes hip&oacute;tesis han surgido para explicar el papel directo patog&eacute;nico del HLA-B51 en la EB<sup>19</sup>:</p>  <ol>    <li>    <p>El HLA-B51 es uno de los ant&iacute;genos divididos del HLA-B5 y difiere s&oacute;lo por dos amino&aacute;cidos de otros ant&iacute;genos divididos, los cuales no est&aacute;n asociados con la EB.</p></li>     <li>    <p>Participaci&oacute;n en la presentaci&oacute;n de p&eacute;ptidos antig&eacute;nicos microbianos relacionados con la EB.</p></li>     <li>    <p>Reactividad cruzada entre el HLA-B51 y ant&iacute;genos espec&iacute;ficos de diferentes &oacute;rganos.</p></li>    </ol>      <p>Veinticuatro diferentes alelos de HLA-B51 (HLA-B&#42; 5101 - HLA-B&#42;5124) han sido descritos; todos ellos comparten la misma secuencia de amino&aacute;cidos en el bolsillo B de la ranura ligadora de ant&iacute;geno excepto B&#42;5107 y B&#42;5120. Tipificaci&oacute;n molecular de HLA-B51 en diferentes grupos &eacute;tnicos sugiere que los alelos B51 en los pacientes con EB no son diferentes de aquellos de los controles sanos<sup>7,19,29</sup>.</p>      ]]></body>
<body><![CDATA[<p>Otra funci&oacute;n de las mol&eacute;culas de HLA clase I ha sido recientemente descrita por la identificaci&oacute;n de una nueva familia de receptores expresados principalmente por las c&eacute;lulas NK, CD8+ y menos frecuentemente por las c&eacute;lulas CD4+, conocidos como receptores KIR (killer immunoglobulin-like receptors). La interacci&oacute;n con estos receptores se asocia con inhibici&oacute;n selectiva de las c&eacute;lulas NK o de la citotoxicidad mediada por c&eacute;lulas. Una hip&oacute;tesis alternativa es que el papel patog&eacute;nico del HLA - B51 en la EB podr&iacute;a resultar de una interacci&oacute;n con mol&eacute;culas KIR en las c&eacute;lulas inflamatorias<sup>1,19</sup>.</p>      <p>En un estudio reciente se demostr&oacute; que la contribuci&oacute;n del locus del HLA-B a la susceptibilidad gen&eacute;tica global de la EB es menor del 20%<sup>30</sup> y se espera la identificaci&oacute;n de otros locus que confieran mayor susceptibilidad gen&eacute;tica a padecer esta enfermedad<sup>19</sup>.</p>      <p>Finalmente, pueden contribuir a la susceptibilidad y/o severidad en la enfermedad los polimorfismos en genes que codifican otras mol&eacute;culas efectoras, tales como: prote&iacute;nas TAP, mol&eacute;culas de adhesi&oacute;n intercelular (ICAM-1), interleuquinas, quimoquinas y receptores de quimoquinas (CCL2 /MCP-1), lectina ligadora de manosa (MLB), N-acetil transferasa (NAT2), sintasa de &oacute;xido n&iacute;trico endotelial (eNOS), glutati&oacute;n S-transferasa (GST), citocromo P450 (CYP1A1), HSPs y Fc&gamma;R. El papel de los polimorfismos y las mutaciones protromb&oacute;ticas (factor V Leiden) es controvertido.<sup>20</sup></p>      <p><b>Agentes microbianos</b></p>      <p>&Eacute;stos han sido postulados como agentes causales o factores disparadores de la enfermedad; sin embargo, su papel permanece incierto y la asociaci&oacute;n con la EB ha sido sugerida por la mayor prevalencia de &eacute;sta en condiciones de hacinamiento, grupos socioecon&oacute;micos bajos y grupos familiares<sup>31</sup>. Los hallazgos son controvertidos: algunos investigadores han reportado el aislamiento de algunos virus de las lesiones mucocut&aacute;neas; no obstante, esto no ha podido ser confirmado por otros<sup>1,19</sup>. Argumentos a favor de la asociaci&oacute;n del HSV con la EB incluyen la identificaci&oacute;n de genoma del HSV tipo 1 en linfocitos circulantes, saliva, &uacute;lceras genitales y gastrointestinales de pacientes con EB y la descripci&oacute;n de un modelo experimental en ratones inoculados con HSV, en el cual el 30% desarroll&oacute; manifestaciones parecidas a EB<sup>1,4,19,32,33</sup>.</p>      <p>Un estudio reciente muestra evidencia que sugiere un papel causal de parvovirus B19 en la EB, sugiriendo la presencia del virus, particularmente en lesiones cut&aacute;neas no ulcerativas<sup>34</sup>.</p>      <p>Algunas bacterias tambi&eacute;n han sido involucradas en la patog&eacute;nesis de la EB; los argumentos a favor de esta teor&iacute;a incluyen: una elevada reactividad a la inyecci&oacute;n cut&aacute;nea de ant&iacute;genos estreptoc&oacute;cicos, logrando inducir manifestaciones sist&eacute;micas de la EB en algunos pacientes; la aparici&oacute;n de las manifestaciones cl&iacute;nicas despu&eacute;s de procedimientos de extracci&oacute;n dental; la mayor prevalencia de caries dental, periodontitis o tonsilitis; el elevado porcentaje de colonias de <i>Streptococcus sanguis</i> (<i>S. sanguis</i>) en la flora oral y la detecci&oacute;n de anticuerpos reactivos contra serotipos poco comunes de <i>S. sanguis</i> en el suero de dichos pacientes<sup>1,4,35,36</sup></p>      <p>Las prote&iacute;nas de choque t&eacute;rmico (HSP) han sido propuestas como el com&uacute;n denominador entre diferentes agen</b>tes microbianos, por presentar homolog&iacute;a estructural con HSP mitocondriales humanas. Ciertos ep&iacute;topes de HSP microbianas actuar&iacute;an como disparadores de una respuesta inmune espec&iacute;fica que producir&iacute;a una reacci&oacute;n inflamatoria cruzada, a trav&eacute;s de un mecanismo de mimetismo molecular, que llevar&iacute;a a una activaci&oacute;n de c&eacute;lulas T y de c&eacute;lulas de memoria y que determinar&iacute;a la cronicidad y la naturaleza recurrente y remitente de las lesiones de la EB<sup>1,37</sup>.</p>      <p><b>Mecanismos inmunes</b></p>      <p>El principal hallazgo microsc&oacute;pico de la EB activa es una oclusi&oacute;n vascular inflamatoria (trombo inflamatorio); en los infiltrados perivasculares se encuentran c&eacute;lulas T CD4+ y c&eacute;lulas Th1 que responden a varios est&iacute;mulos, con producci&oacute;n de IL-2, IFN-&gamma; y TNF-&beta;<sup>38</sup>. Adicionalmente, se han encontrado niveles elevados de IL-8 en pacientes con enfermedad activa<sup>39</sup> y de IL-1&beta; y factor de crecimiento fibrobl&aacute;stico en EB grave<sup>4</sup>. Otros autores demostraron elevaci&oacute;n persistente de los niveles plasm&aacute;ticos de IL-10, independiente de la actividad de la enfermedad, mientras que los niveles de IL-12 y del receptor soluble de TNF s&oacute;lo se elevaron en la enfermedad activa; plantean que estos hallazgos servir&iacute;an como marcadores biol&oacute;gicos de actividad de la enfermedad<sup>40</sup>.</p>      ]]></body>
<body><![CDATA[<p>Varios autores han demostrado una elevada proporci&oacute;n de c&eacute;lulas T &gamma;&delta; en lesiones de EB; estas c&eacute;lulas act&uacute;an como primera l&iacute;nea de defensa, controlan y mantienen el crecimiento e integridad epiteliales, reconocen estructuras microbianas, previniendo el paso de pat&oacute;genos mediante citotoxicidad contra las c&eacute;lulas infectadas. Asimismo, un porcentaje alto de estas c&eacute;lulas podr&iacute;a producir citoquinas inflamatorias como IFN&gamma; y TNF&alpha;<sup>1,41</sup>.</p>      <p>Se ha considerado tambi&eacute;n un incremento en la expresi&oacute;n de CD11a y CD18 en los neutr&oacute;filos, lo cual podr&iacute;a explicar su acumulaci&oacute;n en los sitios inflamatorios<sup>4</sup>. De igual manera, ha sido recientemente demostrado que los neutr&oacute;filos de los pacientes con EB expresan constitutivamente RNAm del TNF y producen abundante cantidad de esta citoquina; esta producci&oacute;n aumentada de TNF podr&iacute;a activar los neutr&oacute;filos y perpetuar su ciclo de vida, resultando tambi&eacute;n en una acumulaci&oacute;n de neutr&oacute;filos activados en el sitio de inflamaci&oacute;n<sup>19</sup>. Por otro lado, la activaci&oacute;n de los monocitos puede explicar la producci&oacute;n de citoquinas proinflamatorias responsables de la cronicidad de la inflamaci&oacute;n<sup>4,42</sup>.</p>      <p>Un hallazgo bien conocido de la EB es la tendencia tromb&oacute;tica con predominio venoso. Varios autores han encontrado hallazgos consistentes con activaci&oacute;n del sistema de coagulaci&oacute;n y fibrinolisis, reflejando activaci&oacute;n o injuria endoteliales<sup>19,43</sup>. Se ha sugerido que la activaci&oacute;n endotelial por los infiltrados perivasculares de c&eacute;lulas mononucleares y neutr&oacute;filos explicar&iacute;a el estado protromb&oacute;tico de la EB. Sin embargo, los marcadores de activaci&oacute;n endotelial no difieren entre los pacientes con o sin trombosis<sup>19</sup>.</p>      <p>La presencia de mutaciones procoagulantes tales como el factor V de Leiden o del gen de la protrombina incrementa el riesgo de trombosis en EB<sup>44,45</sup>. La contribuci&oacute;n de los anticuerpos anticardiolipinas y antic&eacute;lulas endoteliales a la injuria endotelial y a la tendencia tromb&oacute;tica de la EB es especulativa; estos anticuerpos podr&iacute;an ser causantes de trombosis o ser secundarios a la injuria tisular<sup>19,46</sup>.</p>      <p>Tomando en consideraci&oacute;n las evidencias anteriormente mencionadas, se ha propuesto un modelo que explica la patog&eacute;nesis de la EB: un factor ex&oacute;geno (virus o bacteria) es presentado por macr&oacute;fagos y reconocido por c&eacute;lulas T CD4+ en el contexto de los ant&iacute;genos del MHC clase II. Las c&eacute;lulas T Th1 activadas producen citoquinas (IL-2, IFN-&gamma; , TNF-ß) e inducen una proliferaci&oacute;n de las c&eacute;lulas B. El IFN-&gamma; activa los macr&oacute;fagos, que a su vez liberan TNF-&alpha;, IL-1 e IL-8, las cuales inducen la expresi&oacute;n de mol&eacute;culas de adhesi&oacute;n en las c&eacute;lulas endoteliales; IL-8 tambi&eacute;n induce quimiotaxis y activaci&oacute;n de neutr&oacute;filos; ambos eventos son responsables del paso de neutr&oacute;filos polimorfonucleares y linfocitos T activados a trav&eacute;s del endotelio a la zona de inflamaci&oacute;n<sup>4,38</sup>. Los factores gen&eacute;ticos pueden contribuir a la expresi&oacute;n y perpetuaci&oacute;n de la enfermedad<sup>4</sup>.</p>      <p><b>Manifestaciones cl&iacute;nicas</b></p>      <p>La enfermedad de Behcet es un desorden multisist&eacute;mico que puede afectar cualquier &oacute;rgano. El curso cl&iacute;nico est&aacute; caracterizado por exacerbaciones y remisiones de duraci&oacute;n, frecuencia y pron&oacute;stico impredecibles; pueden existir variaciones de acuerdo a la herencia, el g&eacute;nero, el medio ambiente y el estado socioecon&oacute;mico<sup>1</sup>.</p>      <p>Varios estudios han analizado los signos de inicio m&aacute;s frecuentes en la EB<sup>16,47</sup> (<a href="#tab2">Tabla 2</a>).</p>      <p>    <center><a name="tab2"></a><img src="img/revistas/rcre/v16n1/v16n1a07t2.jpg"></center></p>      ]]></body>
<body><![CDATA[<p>De igual manera, han sido analizados los hallazgos cl&iacute;nicos durante el curso de la EB<sup>16,47,48</sup> (<a href="#tab3">Tabla 3</a>).</p>      <p>    <center><a name="tab3"></a><img src="img/revistas/rcre/v16n1/v16n1a07t3.jpg"></center></p>      <p>Las aftas orales se presentan casi en el 100% de los pacientes, por lo cual constituyen uno de los criterios mayores para el diagn&oacute;stico de la EB, siendo el hallazgo inicial en el 66% a 76% de los pacientes. Para ser consideradas manifestaci&oacute;n de esta enfermedad deben recurrir al menos tres veces en un periodo de un a&ntilde;o<sup>49</sup>.</p>      <p>Los sitios m&aacute;s afectados son: la mucosa bucal, la lengua, los labios, las enc&iacute;as, menos frecuentemente el paladar, la faringe posterior, la laringe o las am&iacute;gdalas. Se inician como &aacute;reas elevadas eritematosas que, en uno a dos d&iacute;as, se convierten en &uacute;lceras redondas u ovales poco profundas con un discreto borde eritematoso, cubiertas en el fondo con una pseudomembrana blanca o amarilla. Las &uacute;lceras peque&ntilde;as pueden coalescer formando una &uacute;lcera grande y &uacute;nica, o pueden agruparse produciendo la denominada ulceraci&oacute;n herpetiforme. Estas lesiones son usualmente dolorosas, curan sin dejar cicatriz, y su resoluci&oacute;n ocurre en una a dos semanas. Los intervalos entre las recurrencias son variables y algunas veces se presentan en forma continua<sup>1,2,4,5,7</sup>.</p>      <p>Las aftas o &uacute;lceras genitales se pueden localizar en el escroto, el pene, la regi&oacute;n perianal, la vagina y la vulva. Cl&iacute;nicamente, son similares a las orales, pero en general, son m&aacute;s grandes, m&aacute;s profundas, m&aacute;s dolorosas y toman m&aacute;s tiempo para curar que las lesiones orales; cuando se resuelven, dejan una cicatriz o decoloraci&oacute;n blanca.</p>      <p>Raramente se presentan al inicio de la enfermedad y son menos recurrentes que las &uacute;lceras orales. En las mujeres, estas &uacute;lceras pueden relacionarse cronol&oacute;gicamente con el ciclo menstrual<sup>1,4,5</sup>.</p>      <p>Las &uacute;lceras orales y genitales recurrentes pueden ser la &uacute;nica manifestaci&oacute;n de la enfermedad en mujeres j&oacute;venes, incluso por varios a&ntilde;os, antes de presentar otras manifestaciones de la EB.</p>      <p>La frecuencia de las manifestaciones cut&aacute;neas var&iacute;a entre el 33 y el 100% de los casos; pueden presentarse, en el mismo paciente, varios tipos de lesiones, en forma simult&aacute;nea o en diferentes ocasiones y hacen parte de los criterios diagn&oacute;sticos de la EB<sup>50</sup>. Su incidencia var&iacute;a ampliamente con la localizaci&oacute;n geogr&aacute;fica; algunos autores correlacionan algunas lesiones cut&aacute;neas espec&iacute;ficas de la enfermedad con la edad de inicio, el g&eacute;nero y la tipificaci&oacute;n del HLA<sup>51</sup>.</p>      <p>Las manifestaciones cut&aacute;neas espec&iacute;ficas incluyen: lesiones papulopustulares, lesiones similares al eritema nodoso, tromboflebitis de los vasos superficiales e hipersensibilidad cut&aacute;nea (fen&oacute;meno de patergia) <sup>52</sup>.</p>      ]]></body>
<body><![CDATA[<p>Las lesiones papulopustulares incluyen: pseudofoliculitis est&eacute;riles o lesiones acneiformes en una base eritematosa; se manifiestan inicialmente como p&aacute;pulas que evolucionan en 24 a 48 horas a p&uacute;stulas. Se pueden localizar en cualquier parte del cuerpo, siendo m&aacute;s frecuentes en los miembros inferiores. Se debe hacer diagn&oacute;stico diferencial con acn&eacute; en adolescentes o en personas en tratamiento con corticoides.</p>      <p>El eritema nodoso es m&aacute;s frecuente en las mujeres, afectando principalmente los miembros inferiores, t&iacute;picamente la regi&oacute;n pretibial; se caracteriza por n&oacute;dulos eritematosos dolorosos, rodeados por un halo perif&eacute;rico; no se ulceran y se resuelven espont&aacute;neamente, dejando &aacute;reas de hiperpigmentaci&oacute;n. Debe diferenciarse de la tromboflebitis superficial, que aparece en el 30% de los pacientes con EB.</p>      <p>Otros hallazgos cut&aacute;neos descritos con menor frecuencia incluyen: ves&iacute;culas, pioderma gangrenoso, s&iacute;ndrome de Sweet, lesiones papulonodulares purp&uacute;ricas acrales y raramente necrosis<sup>52-55</sup>.</p>      <p>Una caracter&iacute;stica importante en la EB es un incremento en la respuesta inflamatoria no espec&iacute;fica<sup>19</sup>. El ejemplo cl&aacute;sico es la reacci&oacute;n cut&aacute;nea de patergia, la cual se caracteriza por el desarrollo de una p&aacute;pula o una p&uacute;stula 24 a 48 horas despu&eacute;s de una punci&oacute;n en la piel con aguja est&eacute;ril, similar a la que aparece espont&aacute;neamente en la enfermedad. Este incremento en la respuesta al trauma menor no es solo en la piel y puede ser observado en otros sitios corporales o presentarse como un infiltrado inflamatorio perivascular, incluso sin manifestaci&oacute;n cut&aacute;nea ("patergia histol&oacute;gica")<sup>1,2,4,56</sup>.</p>      <p>La interacci&oacute;n entre mol&eacute;culas de adhesi&oacute;n celular y la proliferaci&oacute;n endotelial puede jugar un papel importante en la patog&eacute;nesis del fen&oacute;meno de patergia<sup>56</sup>.</p>      <p>Existe variaci&oacute;n geogr&aacute;fica en la frecuencia del fen&oacute;meno de patergia, siendo usualmente positivo en los pacientes con EB que habitan las regiones correspondientes a la antigua ruta de la seda, pero s&oacute;lo en el 20% a 30% de los americanos y los europeos<sup>1,2</sup>.</p>      <p>El fen&oacute;meno de patergia es usualmente positivo durante la fase activa de la EB y negativo o d&eacute;bilmente positivo cuando la enfermedad se encuentra en remisi&oacute;n<sup>1,2</sup>. La intensidad de la reacci&oacute;n puede variar en el mismo paciente en diferentes momentos, y usualmente existe variaci&oacute;n intra e interobservador. Muchos factores pueden influenciar la interpretaci&oacute;n de la prueba de patergia, tales como: el tipo de aguja, el retraso en la lectura y la t&eacute;cnica de punci&oacute;n empleada<sup>57</sup>; todos estos factores, sumados a la falta de estandarizaci&oacute;n, ocasionan la gran diferencia en los resultados en los distintos grupos poblacionales estudiados<sup>2,58</sup>.</p>      <p>Las manifestaciones oculares se presentan en cerca del 70% de pacientes con EB<sup>59,60</sup>, raz&oacute;n por la cual se considera un criterio de diagn&oacute;stico de la entidad. Se pueden afectar casi todas las estructuras oculares, de forma uni o bilateral. Son m&aacute;s frecuentes en los hombres, con una relaci&oacute;n de 2:1. Caracter&iacute;sticamente, los episodios son recurrentes, produciendo da&ntilde;o ocular irreversible. La edad promedio de inicio es alrededor de los 30 a&ntilde;os. En los hombres, se caracteriza por tener un inicio m&aacute;s temprano y un curso m&aacute;s grave<sup>59</sup>. Los factores de riesgo que se correlacionan con el compromiso ocular en la EB son: la edad de comienzo de la enfermedad, el g&eacute;nero masculino y compromiso del sistema nervioso central (SNC)<sup>1</sup>.</p>      <p>La t&iacute;pica afecci&oacute;n ocular es la uve&iacute;tis recurrente, que puede ser anterior, posterior o panuve&iacute;tis. La uve&iacute;tis anterior o iridociclitis puede estar o no acompa&ntilde;ada de hipopion. Otros hallazgos incluyen conjuntivitis, epiescleritis, escleritis y queratitis. Es poco frecuente encontrar par&aacute;lisis de los m&uacute;sculos extraoculares por compromiso neurol&oacute;gico<sup>1-4,59,60</sup>.</p>      <p>La afecci&oacute;n del segmento posterior es m&aacute;s frecuente y grave y se acompa&ntilde;a siempre de vitri&iacute;tis; las alteraciones pueden ser de tres tipos<sup>59</sup>:</p>  <ol type="a">    ]]></body>
<body><![CDATA[<li>Vasculitis retiniana, que afecta sobre todo las venas (periflebitis) y puede dar lugar a oclusi&oacute;n venosa.</li>     <li>Exudaci&oacute;n retiniana aguda masiva, que afecta las capas retinianas exteriores y a veces da lugar a grandes &aacute;reas de atrofia retiniana por obliteraci&oacute;n de los vasos sangu&iacute;neos situados por encima de &eacute;sta.</li>     <li>Vasodilataci&oacute;n retiniana. Es el hallazgo m&aacute;s frecuente y duradero; el consiguiente aumento de la permeabilidad vascular provoca edema retiniano difuso, edema macular cistoideo e hiperemia del disco &oacute;ptico.</li>    </ol>      <p>La oclusi&oacute;n vascular retiniana ha sido correlacionada con tres factores principales: estasis vascular, anormalidades tromb&oacute;ticas y vasculitis<sup>1</sup>.</p>      <p>La p&eacute;rdida de la visi&oacute;n es la m&aacute;s importante y temida complicaci&oacute;n de la EB; ocurre, en promedio, 3,36 a&ntilde;os despu&eacute;s del comienzo de los s&iacute;ntomas oculares1. En algunas series se informa que hasta el 74% de los pacientes tratados perdieron la visi&oacute;n &uacute;til entre seis y diez a&ntilde;os despu&eacute;s del comienzo de los s&iacute;ntomas oculares<sup>61</sup>.</p>      <p>Sakamoto et al. demuestran que la presencia de lesiones cut&aacute;neas, artritis y el compromiso ocular posterior se correlacionan con un mal pron&oacute;stico visual; por el contrario, en el g&eacute;nero femenino, la presentaci&oacute;n c&iacute;clica de la enfermedad y el compromiso ocular anterior se asocian a mejor pron&oacute;stico<sup>62</sup>.</p>      <p>La incidencia de compromiso vascular var&iacute;a entre el 7% y el 29%<sup>63</sup>; la EB afecta tanto el sistema arterial como el venoso. Se han descrito cuatro tipos de lesiones que incluyen: oclusi&oacute;n arterial, aneurismas, oclusi&oacute;n venosa y tromboflebitis o trombosis en las extremidades y en otros &oacute;rganos. Las lesiones vasculares usualmente ocurren en el sistema venoso (80%), seguido por el sistema arterial (20%). La frecuencia de s&iacute;ntomas vasculares en los pacientes es de un 8,7% en hombres y de un 6,3% en mujeres<sup>64</sup>. El espectro de lesiones descritas incluye desde tromboflebitis superficial a lesiones oclusivas de la vena cava, estenosis y aneurismas del arco a&oacute;rtico, la aorta tor&aacute;cica y abdominal, las arterias pulmonares y las perif&eacute;ricas. Aunque la complicaci&oacute;n vascular m&aacute;s frecuente es la trombosis venosa, la principal causa de muerte es la ruptura de aneurismas de las grandes arterias, con una mortalidad que puede llegar a ser del 20%. Las lesiones oclusivas usualmente ocurren en grandes arterias, tales como la subclavia, la pulmonar y las femoropopl&iacute;teas<sup>65</sup>; pero tambi&eacute;n puede comprometer arterias m&aacute;s peque&ntilde;as. Ha sido descrito infarto agudo de miocardio por trombosis y vasculitis coronaria<sup>66,64</sup>.</p>      <p>La frecuencia de manifestaciones neurol&oacute;gicas var&iacute;a entre el 5% y el 30%, y es m&aacute;s com&uacute;n en los hombres. Tanto el SNC como el perif&eacute;rico pueden estar comprometidos. Los hallazgos en el SNC pueden ser divididos en dos grupos principales: el primero conformado por compromiso parenquimatoso, el cual incluye afecci&oacute;n de tallo cerebral, manifestaciones hemisf&eacute;ricas, lesiones del cord&oacute;n espinal y cuadros de meningoencefalitis. El segundo grupo corresponde al compromiso no parenquimatoso; &eacute;ste incluye: trombosis del seno dural, oclusi&oacute;n y/o aneurismas arteriales. Las neuropat&iacute;as perif&eacute;ricas y las miopat&iacute;as son relativamente raras<sup>67</sup>.</p>      <p>Akman-Demir, et al., en 200 pacientes con neuro-Behcet, encontraron que el 81% present&oacute; compromiso parenquimatoso (tallo cerebral 51%, cord&oacute;n espinal 14%, compromiso hemisf&eacute;rico 15% y signos piramidales aislados 19%), mientras que el 19% present&oacute; compromiso no parenquimatoso. En el primer grupo, los hallazgos m&aacute;s comunes fueron: signos piramidales, hemiparesia, cambios de conducta y disturbios esfinterianos; por otro lado, en el segundo grupo, el s&iacute;ndrome de hipertensi&oacute;n intracraneana debido a trombosis del seno dural fue la principal manifestaci&oacute;n cl&iacute;nica. En el 60% de los casos con compromiso parenquimatoso el estudio del l&iacute;quido cefalorraqu&iacute;deo (LCR) mostr&oacute; pleocitosis y/o hiperproteinorraquia, y en m&aacute;s de la mitad de pacientes de este grupo la resonancia magn&eacute;tica mostr&oacute; lesiones del tallo cerebral o de los ganglios basales. Asimismo, se encontr&oacute; que la presencia de compromiso parenquimatoso, elevaci&oacute;n de prote&iacute;nas o pleocitosis en el LCR, enfermedad de curso progresivo primario o secundario y reca&iacute;das durante el desmonte de esteroides, se asociaron con un peor pron&oacute;stico<sup>68</sup>.</p>      ]]></body>
<body><![CDATA[<p>Entre el 50% y el 60% de los pacientes presentan artralgias o artritis; &eacute;sta no es migratoria y ni erosiva, con remisiones y reca&iacute;das prolongadas1; las reca&iacute;das usualmente se asocian con fiebre, lesiones cut&aacute;neas (principalmente papulopustulares)<sup>69</sup> y elevaci&oacute;n de reactantes de fase aguda<sup>70</sup>. T&iacute;picamente la artritis es oligoarticular en la mayor&iacute;a de los pacientes; la articulaci&oacute;n m&aacute;s afectada es la rodilla, seguida por los tobillos, los codos y las mu&ntilde;ecas; aunque tambi&eacute;n pueden comprometerse las peque&ntilde;as articulaciones de los pies y las manos.</p>      <p>Otros hallazgos, reportados con menor frecuencia, son: osteonecrosis con m&uacute;ltiples lesiones osteol&iacute;ticas reversibles, entesitis, sacroili&iacute;tis, da&ntilde;o erosivo con p&eacute;rdida del cart&iacute;lago y formaci&oacute;n de pannus<sup>1,4,5,71</sup>.</p>      <p>En el grupo de manifestaciones menos frecuentes se incluyen las cardiopulmonares, gastrointestinales y genitourinarias.</p>      <p>La prevalencia real del compromiso pulmonar en la EB es desconocida. En un an&aacute;lisis retrospectivo de 2.179 pacientes con EB, la prevalencia fue del 1,1%. La arteritis con formaci&oacute;n de aneurismas es la principal manifestaci&oacute;n de la EB; tambi&eacute;n se describen: oclusi&oacute;n tromb&oacute;tica de los vasos, infarto o hemorragia pulmonares, hipertensi&oacute;n arterial pulmonar y falla cardiaca derecha<sup>72</sup>.</p>      <p>La frecuencia de las manifestaciones card&iacute;acas es del 5% al 10%4; &eacute;stas incluyen: infarto del miocardio, pericarditis, endocarditis, y anormalidades valvulares tales como regurgitaci&oacute;n a&oacute;rtica y mitral. La fibrosis endomioc&aacute;rdica de los ventr&iacute;culos puede ser secuela de la vasculitis y se puede complicar con trombosis intraventricular<sup>4,5</sup>.</p>      <p>En cuanto al compromiso gastrointestinal, se pueden encontrar &uacute;lceras &uacute;nicas o m&uacute;ltiples a lo largo de todo el tracto gastrointestinal, siendo m&aacute;s frecuentes en el ileon terminal y en el ciego. Los principales hallazgos son dolor abdominal, diarrea, hemorragia y perforaci&oacute;n<sup>4,5</sup>. Raramente se ha descrito el s&iacute;ndrome de Budd-Chiari que es un hallazgo de mal pron&oacute;stico<sup>73</sup>.</p>      <p>La incidencia de epididimitis es de 4% a 11%. Otros hallazgos menos frecuentes incluyen: glomerulonefritis aguda, amiloidosis, nefropat&iacute;a por IgA, trombosis de la vena renal y glomerulonefritis focal o segmentaria<sup>4</sup>.</p>      <p>En Colombia, Londo&ntilde;o y colaboradores encuentran aftas orales en el 100%, aftas genitales en el 75% y alg&uacute;n tipo de compromiso ocular en el 87,5% de los pacientes<sup>16</sup>.</p>      <p><b>Diagn&oacute;stico</b></p>      <p>El diagn&oacute;stico se basa en hallazgos cl&iacute;nicos espec&iacute;ficos y no en hallazgos de anatom&iacute;a patol&oacute;gica o de laboratorio. Han sido propuestos diferentes criterios diagn&oacute;sticos<sup>1,2,4</sup>; los del Grupo Internacional de Estudio<sup>50</sup> (<a href="#tab4">Tabla 4</a>) tienen la mayor especificidad (96%) y el mayor valor relativo de discriminaci&oacute;n<sup>74</sup> (<a href="#tab5">Tabla 5</a>).</p>      ]]></body>
<body><![CDATA[<p>    <center><a name="tab4"></a><img src="img/revistas/rcre/v16n1/v16n1a07t4.jpg"></center></p>      <p>    <center><a name="tab5"></a><img src="img/revistas/rcre/v16n1/v16n1a07t5.jpg"></center></p>      <p>Los hallazgos histopatol&oacute;gicos no son espec&iacute;ficos e incluyen: vasculitis linfoc&iacute;tica y necrotizante de las v&eacute;nulas post capilares superficiales con necrosis fibrinoide asociada<sup>75-77</sup>. Chen et al. demostraron vasculitis casi en el 50% de los pacientes<sup>78</sup>. La inflamaci&oacute;n endotelial es un hallazgo frecuente, as&iacute; como un infiltrado linfoc&iacute;tico o neutrof&iacute;lico perivascular asociado<sup>77</sup>. Hallazgos adicionales incluyen: un infiltrado neutrof&iacute;lico d&eacute;rmico difuso con o sin formaci&oacute;n de abscesos, que corresponden cl&iacute;nicamente a lesiones pustulares, foliculitis aguda y cambios pustulares acneiformes. Las lesiones de eritema nodoso corresponden a una vasculitis necrotizante de los vasos subcut&aacute;neos, usualmente asociada con trombosis. Tambi&eacute;n se ha descrito paniculitis lobular o septal. La tromboflebitis superficial est&aacute; presente en m&aacute;s del 30% de los pacientes. Las aftas orales y genitales muestran ulceraci&oacute;n no espec&iacute;fica, acompa&ntilde;ada, en algunas ocasiones, por vasculitis linfoc&iacute;tica o leucocitocl&aacute;stica<sup>77</sup>.</p>      <p>Los hallazgos de laboratorio son inespec&iacute;ficos y reflejan el estado inflamatorio de la enfermedad; &eacute;stos incluyen: elevaci&oacute;n de la velocidad de eritrosedimentaci&oacute;n, la prote&iacute;na C reactiva y otros reactantes de fase aguda. Ocasionalmente puede haber elevaci&oacute;n de los niveles de IgA, IgG, &alpha;-2 globulina, IgM y dep&oacute;sito de complejos inmunes en algunas lesiones<sup>4</sup>.</p>      <p>Debido a que existen pocos marcadores de laboratorio confiables que sirvan como par&aacute;metro de seguimiento de la EB, la evaluaci&oacute;n de la actividad de la enfermedad se hace con base en las manifestaciones cl&iacute;nicas. Por la necesidad de tener un m&eacute;todo objetivo para evaluar la actividad y progresi&oacute;n de la EB y su respuesta al tratamiento, se dise&ntilde;&oacute; el <i>Current Activity Form</i> (BDCAF), basado en el <i>Iranian Beh&ccedil;et's Disease Dynamic Measure</i> (IBDDAM) y en un esquema europeo. Este m&eacute;todo fue revisado y aprobado en una reuni&oacute;n de consenso del <i>International Scientific Committee on Behcet Disease</i> realizado en Leeds en 1994<sup>79,80</sup>.</p>      <p>El BDCAF eval&uacute;a varios par&aacute;metros que incluyen: la escala de Likert (indica c&oacute;mo perciben el m&eacute;dico y el paciente el comportamiento de la enfermedad en las &uacute;ltimas cuatro semanas) y la presencia o ausencia (en las cuatro &uacute;ltimas semanas) de aftas orales o genitales, compromiso articular, cut&aacute;neo, gastrointestinal, ocular, SNC y vascular. Este instrumento ha sido validado y tiene una buena confiabilidad interobservador en la valoraci&oacute;n de la actividad general de la enfermedad; su uso ha sido sugerido en el monitoreo cl&iacute;nico peri&oacute;dico de los pacientes con EB y en la evaluaci&oacute;n de resultados terap&eacute;uticos<sup>80</sup>.</p>      <p>Otra forma de evaluar la actividad de la enfermedad es a trav&eacute;s de un &iacute;ndice de actividad cl&iacute;nica que eval&uacute;a los hallazgos cl&iacute;nicos en los &uacute;ltimos seis meses acorde con lo reportado por Yacizi, et al<sup>81</sup>.</p>      <p>Por otro lado, Krause, et al<sup>82</sup>. sugirieron una estimaci&oacute;n de severidad de la enfermedad, clasific&aacute;ndola como leve, moderada o severa, seg&uacute;n la presencia de hallazgos cl&iacute;nicos espec&iacute;ficos.</p>      ]]></body>
<body><![CDATA[<p><b>Pron&oacute;stico</b></p>      <p>La EB tiene un curso cr&oacute;nico con exacerbaciones y remisiones impredecibles, cuya frecuencia y severidad pueden disminuir con el tiempo. Despu&eacute;s de los primeros cinco a&ntilde;os, la enfermedad adquiere un curso estable o hacia la mejor&iacute;a; despu&eacute;s de la cuarta d&eacute;cada, se disminuye la severidad cl&iacute;nica, con intervalos m&aacute;s largos de recurrencia entre las exacerbaciones<sup>83</sup>. El pron&oacute;stico es bueno, a menos que haya compromiso de &oacute;rganos vitales<sup>2,4</sup>.</p>      <p>La presentaci&oacute;n en el g&eacute;nero masculino y la edad de inicio temprano (antes de los 25 a&ntilde;os) se han asociado con manifestaciones m&aacute;s graves de la enfermedad, que incluyen: trombosis vascular y compromiso ocular, gastrointestinal o del SNC<sup>84-86</sup>.</p>      <p>Kural-Seyahi<sup>86</sup>, et al. encontraron una tasa de mortalidad del 9,8%, debida principalmente al compromiso vascular. Asimismo, el compromiso neurol&oacute;gico y la perforaci&oacute;n de &uacute;lceras intestinales tambi&eacute;n representan causas importantes de mortalidad<sup>86</sup>.</p>      <p>La positividad para el HLA-B51 generalmente no determina el pron&oacute;stico ni la respuesta a la terapia. En un estudio comparativo de Turqu&iacute;a y Reino Unido no se encontr&oacute; asociaci&oacute;n entre la presencia del alelo HLA-B51 y la gravedad de la enfermedad<sup>84</sup>.</p>      <p><b>Tratamiento</b></p>      <p>Las aftas orales y genitales se manejan con la aplicaci&oacute;n t&oacute;pica de corticosteroides de alta potencia, como terapia de primera l&iacute;nea. En las aftas menores o mayores graves est&aacute;n indicados los corticoides intralesionales (triamcinolona). El uso de corticoides sist&eacute;micos est&aacute; reservado para lesiones mucocut&aacute;neas m&aacute;s graves y extensas<sup>5,87,88</sup>.</p>      <p>El sucralfate induce proliferaci&oacute;n de los fibroblastos d&eacute;rmicos y formaci&oacute;n de tejido de granulaci&oacute;n. Un estudio doble ciego demostr&oacute; que el uso de sucralfate en suspensi&oacute;n redujo la frecuencia, el dolor y el tiempo de curaci&oacute;n de las aftas orales y genitales. Los resultados de este estudio tambi&eacute;n sugieren que puede ser usado en la prevenci&oacute;n del desarrollo de aftas orales en pacientes con EB. La dosis recomendada es 5 ml cuatro veces al d&iacute;a como suspensi&oacute;n oral y aplicaci&oacute;n t&oacute;pica en lesiones genitales<sup>89</sup>.</p>      <p>Para el manejo del dolor se puede utilizar lidoca&iacute;na viscosa al 1% o 2% t&oacute;pica.</p>      <p>Otras terapias t&oacute;picas incluyen clorhexidina 1% a 2%, tetraciclina en suspensi&oacute;n y tacrolimus<sup>88</sup>.</p>      ]]></body>
<body><![CDATA[<p>El medicamento sist&eacute;mico de elecci&oacute;n, en el tratamiento de las aftas orales y genitales, es la colchicina; su mecanismo de acci&oacute;n se basa en la inhibici&oacute;n de la quimiotaxis de los neutr&oacute;filos. La colchicina oral (0,6 mg tres veces al d&iacute;a) disminuye en m&aacute;s del 50% el tama&ntilde;o, la frecuencia y la duraci&oacute;n de las &uacute;lceras orales<sup>90</sup>. Es tambi&eacute;n de utilidad en el manejo de las lesiones cut&aacute;neas<sup>5</sup>.</p>      <p>Para casos m&aacute;s graves y refractarios est&aacute; indicado el uso de dapsona que tambi&eacute;n inhibe la quimiotaxis de los neutr&oacute;filos<sup>91</sup>.</p>      <p>Algunos autores han reportado que la pentoxifilina disminuye la frecuencia y severidad de las aftas orales y vaginales a corto plazo en un 75%; este efecto contin&uacute;a por m&aacute;s de seis meses en el 50% de los pacientes. El uso combinado de pentoxifilina y colchicina parece tener un efecto sin&eacute;rgico en las &uacute;lceras orogenitales<sup>92,93</sup>.</p>      <p>La azatioprina es el inmunosupresor con mayor evidencia cient&iacute;fica en la EB; un estudio prospectivo, doble ciego, controlado con placebo demostr&oacute; reducci&oacute;n en la frecuencia y la severidad de las lesiones orales y cut&aacute;neas<sup>87</sup>.</p>      <p>Varios estudios han encontrado que la talidomida es efectiva en el manejo de las lesiones mucocut&aacute;neas, &uacute;lceras gastrointestinales y artritis<sup>87</sup>. El mecanismo de acci&oacute;n en la EB es a trav&eacute;s de la modulaci&oacute;n de la citotoxicidad mediada por complejos inmunes circulantes y por neutr&oacute;filos. Est&aacute; reservada para enfermedad grave y refractaria a otros tratamientos, por sus potenciales efectos adversos, como neuropat&iacute;a perif&eacute;rica y teratogenicidad<sup>5,87,94</sup>.</p>      <p>Las manifestaciones cut&aacute;neas, especialmente el eritema nodoso, responden satisfactoriamente a colchicina, dapsona o corticoides sist&eacute;micos<sup>4</sup>.</p>      <p>Lin et al., en 2006, recomiendan el uso de corticoides t&oacute;picos o intralesionales, pentoxifilina, sucralfate o dapsona, para enfermedad mucocut&aacute;nea leve a moderada; dependiendo de la respuesta, estos tratamientos pueden ser usados solos o en combinaci&oacute;n. Para controlar el dolor, es &uacute;til la lidoca&iacute;na viscosa aplicada t&oacute;picamente. Si despu&eacute;s de tres a cuatro semanas estas terapias son inefectivas, puede adicionarse colchicina oral y/o corticoides sist&eacute;micos a bajas dosis. Si en tres a cuatro semanas no hay mejor&iacute;a, se debe considerar agregar azatioprina o metotrexate. Si fallan todas estas intervenciones, el siguiente paso es el uso de inhibidores del TNF-&alpha;, tales como infliximab o etanercept. El uso de ciclosporina e interfer&oacute;n &alpha;-2a solo est&aacute; indicado cuando no haya respuesta con inhibidores del TNF-&alpha;<sup>87</sup>.</p>      <p>La <a href="#tab6">Tabla 6</a> resume los esquemas de tratamiento indicados en el compromiso sist&eacute;mico.</p>      <p>    <center><a name="tab6"></a><img src="img/revistas/rcre/v16n1/v16n1a07t6.jpg"></center></p>      ]]></body>
<body><![CDATA[<p>Los avances recientes en el conocimiento de la patog&eacute;nesis de la EB han llevado a nuevas aproximaciones terap&eacute;uticas y a un mejor entendimiento de la acci&oacute;n de los tratamientos establecidos. Por otro lado, la disponibilidad de los nuevos agentes antiinflamatorios e inmunomoduladores, tales como los inhibidores del TNF-&alpha; y el interfer&oacute;n &alpha;-2a han proporcionado herramientas promisorias en el tratamiento de enfermedad recalcitrante<sup>95</sup>. Las manifestaciones vasculares y neurol&oacute;gicas a&uacute;n constituyen desaf&iacute;os terap&eacute;uticos, por lo que se requiere un mayor n&uacute;mero de estudios que permitan dilucidar mejores estrategias de tratamiento en enfermedad grave.</p>      <p><b>Conclusi&oacute;n</b></p>      <p>La EB es un desorden multisist&eacute;mico con manifestaciones cl&iacute;nicas variables, cuya etiopatogenia no es muy bien conocida todav&iacute;a. Se caracteriza por un curso cl&iacute;nico con exacerbaciones y remisiones de duraci&oacute;n y frecuencia impredecibles. El tratamiento es usualmente sintom&aacute;tico y paliativo, y requiere manejo multidisciplinario que incluye reumatolog&iacute;a, dermatolog&iacute;a, oftalmolog&iacute;a, neurolog&iacute;a y cirug&iacute;a vascular, entre otras especialidades.</p>  <hr>      <p><b>Referencias</b></p>      <!-- ref --><p>1. Al-Mutawa SA, Hegab SM. Behcet's disease. Clin Exp Med 2004; 4: 103-131.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000137&pid=S0121-8123200900010000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Al-Otaibi LM, Porter SR, Poate TW. Behcet's disease: A review. J Dent Res 2005; 84(3): 209-222.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000138&pid=S0121-8123200900010000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>3. Bonfioli A, Orefice F. Behcet's disease. Semin Ophthalmol 2005; 20: 199-206.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000139&pid=S0121-8123200900010000700003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>4. Kaklamani V, Vaiopoulos G, Kaklamanis P. Behcet's disease. 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