<?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>S0121-81232015000100004</article-id>
<article-id pub-id-type="doi">10.1016/j.rcreu.2015.02.001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Compromiso del sistema nervioso central en el lupus eritematoso sistémico]]></article-title>
<article-title xml:lang="en"><![CDATA[Central nervous system involvement in systemic lupus erythematosus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Cortés]]></surname>
<given-names><![CDATA[Diana]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa-González]]></surname>
<given-names><![CDATA[Néstor]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz]]></surname>
<given-names><![CDATA[María Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[Juan Martín]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Ávila]]></surname>
<given-names><![CDATA[Daniel G]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Pontificia Universidad Javeriana Hospital Universitario San Ignacio Neurología]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Pontificia Universidad Javeriana Hospital Universitario San Ignacio Medicina Interna]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Pontificia Universidad Javeriana Hospital Universitario San Ignacio Unidad de Reumatología]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2015</year>
</pub-date>
<volume>22</volume>
<numero>1</numero>
<fpage>16</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-81232015000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-81232015000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-81232015000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivos: Revisar los criterios diagnósticos, epidemiología, fisiopatología, manifestaciones neurológicas, diagnóstico y tratamiento de las manifestaciones del lupus eritematoso sistémico en el sistema nervioso central. Métodos: Búsqueda de la literatura en bases de datos (PubMed), complementada con la revisión de las bibliografías que figuran en los artículos identificados. Para la selección de la bibliografía no se limitó el tiempo de publicación y solo se incluyeron artículos en español y en inglés. Resultados: El compromiso del sistema nervioso central es una de las principales causas de morbimortalidad en pacientes con lupus eritematoso sistémico. Manifestaciones comunes (incidencia acumulada mayor al 5%) incluyen ataques cerebrovasculares y convulsiones; son relativamente poco comunes (1-5%) la disfunción cognitiva, la confusión aguda y la psicosis, mientras que los trastornos neuropsiquiátricos restantes son inusuales (menos del 1%). Los mecanismos que pueden conducir a estas manifestaciones incluyen lesiones intracraneales vasculares (vasculitis y trombosis), producción de autoanticuerpos frente a antígenos neuronales, ribosomas y fosfolípidos, y la inflamación relacionada con la producción local de citoquinas. Las pruebas serológicas, el estudio de líquido cefalorraquídeo y las imágenes han sido utilizados para apoyar el diagnóstico clínico. El tratamiento se basa en el uso de corticosteroides, inmunosupresores y medicamentos sintomáticos. El tratamiento anti-plaquetario y anticoagulante se realiza cuando se encuentran títulos moderados a altos de anticuerpos antifosfolípidos. Conclusiones: La afectación de órganos vitales, como el cerebro, en los pacientes con lupus eritematoso sistémico impulsa los esfuerzos para desarrollar herramientas de diagnóstico de enfermedad neuropsiquiátrica asociada a lupus eritematoso sistémico, para guiar decisiones terapéuticas eficaces]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objectives: To review the epidemiological, pathophysiological, and neurological manifestations, as well as the diagnosis and treatment of central nervous system involvement in systemic lupus erythematosus. Methods: A literature search was performed using PubMed database complemented by review of literature references listed in identified articles. There were no limits to publication date of the literature references. Only articles in English and Spanish were included. Results: Central nervous system involvement is one of the major causes of morbidity and mortality in systemic lupus erythematosus patients. Common disorders (cumulative incidence >5%) were cerebrovascular disease and seizures, and relatively uncommon (1-5%) were severe cognitive dysfunction, acute confusional state, psychosis, while the remaining neuropsychiatric disorders were unusual (less than 1%). Mechanisms that can lead to neuropsychiatric manifestations include intracranial vascular lesions (vasculitis and thrombosis), autoantibody production against neuronal antigens, ribosomes, and phospholipids, and inflammation related to local cytokine production. Serological tests, cerebrospinal fluid, and imaging investigations have been used to support the clinical diagnosis. Treatment is based on the use of corticosteroids, immunosuppressants, and symptomatic treatment. The use of antiplatelet and antithrombotic drugs was indicated when positive moderate-to-high titres of anti-phospholipid antibodies were present. Conclusions: The involvement of vital organs and tissues, such as the brain, in patients with systemic lupus erythematosus, impels efforts to develop diagnostic tools for systemic lupus erythematosus associated neuropsychiatric disease to guide effective therapeutic decisions. © 2014 Asociación Colombiana de Reumatología. Published by Elsevier España, S.L.U]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lupus eritematoso sistémico]]></kwd>
<kwd lng="es"><![CDATA[Vasculitis]]></kwd>
<kwd lng="es"><![CDATA[Convulsión]]></kwd>
<kwd lng="es"><![CDATA[Morbilidad]]></kwd>
<kwd lng="es"><![CDATA[Mortalidad]]></kwd>
<kwd lng="en"><![CDATA[Systemic lupus erythematosus Vasculitis]]></kwd>
<kwd lng="en"><![CDATA[Seizures]]></kwd>
<kwd lng="en"><![CDATA[Morbidity]]></kwd>
<kwd lng="en"><![CDATA[Mortality]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="Verdana" size="2">      <p><b>Art&iacute;culo de revisi&oacute;n</b></p>      <p><a href="http://dx.doi.Org/10.1016/j.rcreu.2015.02.001" target="_blank">http://dx.doi.Org/10.1016/j.rcreu.2015.02.001</a></p>     <p align="center"><font size="4"><b>Compromiso del sistema nervioso central en el lupus eritematoso sist&eacute;mico</b></font></p>     <p align="center"><font size="3"><b>Central nervous system involvement in systemic lupus erythematosus</b></font></p>      <p align="center"><b><i>Diana D&iacute;az-Cort&eacute;s</i></b><sup>a</sup><b>, <i>N&eacute;stor Correa-Gonz&aacute;lez</i></b><sup>b</sup>, <b><i>Mar&iacute;a Claudia D&iacute;az</i></b><sup>c</sup><b>, <i>Juan Mart&iacute;n Guti&eacute;rrez</i></b><sup>c</sup> <b><i>y Daniel G. Fern&aacute;ndez-&Aacute;vila</i></b><sup>c,*</sup></p>      <p><sup>a</sup> <i>Neurolog&iacute;a, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogot&aacute;, Colombia</i>    <br> <sup>b</sup> <i>Medicina Interna, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogot&aacute;, Colombia</i>    <br> <sup>c</sup> <i>Unidad de Reumatolog&iacute;a, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Grupo Javeriano de Investigaci&oacute;n en Enfermedades Reum&aacute;ticas, Bogot&aacute;, Colombia</i></p>      <p><sup>*</sup> <i>Autor para correspondencia</i>. Correo electr&oacute;nico: <a href="mailto:danielfernandezmd@gmail.com">danielfernandezmd@gmail.com</a> (D.G. Fern&aacute;ndez-&Aacute;vila). </p>      ]]></body>
<body><![CDATA[<p><i>Historia del art&iacute;culo: </i>Recibido el 11 de febrero de 2014 Aceptado el 4 de febrero de 2015 <i>On-line </i>el 16 de marzo de 2015</p>  <hr>     <p><font size="3"><b>Resumen</b></font></p>      <p><i>Objetivos: </i>Revisar los criterios diagn&oacute;sticos, epidemiolog&iacute;a, fisiopatolog&iacute;a, manifestaciones neurol&oacute;gicas, diagn&oacute;stico y tratamiento de las manifestaciones del lupus eritematoso sist&eacute;mico en el sistema nervioso central.</p>      <p><i>M&eacute;todos: </i>B&uacute;squeda de la literatura en bases de datos (PubMed), complementada con la revisi&oacute;n de las bibliograf&iacute;as que figuran en los art&iacute;culos identificados. Para la selecci&oacute;n de la bibliograf&iacute;a no se limit&oacute; el tiempo de publicaci&oacute;n y solo se incluyeron art&iacute;culos en espa&ntilde;ol y en ingl&eacute;s.</p>      <p><i>Resultados: </i>El compromiso del sistema nervioso central es una de las principales causas de morbimortalidad en pacientes con lupus eritematoso sist&eacute;mico. Manifestaciones comunes (incidencia acumulada mayor al 5%) incluyen ataques cerebrovasculares y convulsiones; son relativamente poco comunes (1-5%) la disfunci&oacute;n cognitiva, la confusi&oacute;n aguda y la psicosis, mientras que los trastornos neuropsiqui&aacute;tricos restantes son inusuales (menos del 1%). Los mecanismos que pueden conducir a estas manifestaciones incluyen lesiones intracraneales vasculares (vasculitis y trombosis), producci&oacute;n de autoanticuerpos frente a ant&iacute;genos neuronales, ribosomas y fosfol&iacute;pidos, y la inflamaci&oacute;n relacionada con la producci&oacute;n local de citoquinas. Las pruebas serol&oacute;gicas, el estudio de l&iacute;quido cefalorraqu&iacute;deo y las im&aacute;genes han sido utilizados para apoyar el diagn&oacute;stico cl&iacute;nico. El tratamiento se basa en el uso de corticosteroides, inmunosupresores y medicamentos sintom&aacute;ticos. El tratamiento anti-plaquetario y anticoagulante se realiza cuando se encuentran t&iacute;tulos moderados a altos de anticuerpos antifosfol&iacute;pidos.</p>      <p><i>Conclusiones: </i>La afectaci&oacute;n de &oacute;rganos vitales, como el cerebro, en los pacientes con lupus eritematoso sist&eacute;mico impulsa los esfuerzos para desarrollar herramientas de diagn&oacute;stico de enfermedad neuropsiqui&aacute;trica asociada a lupus eritematoso sist&eacute;mico, para guiar decisiones terap&eacute;uticas eficaces.</p>      <p><i><b>Palabras clave</b>:</i> Lupus eritematoso sist&eacute;mico, Vasculitis, Convulsi&oacute;n, Morbilidad, Mortalidad.</p>  <hr>     <p><font size="3"><b>Abstract</b></font></p>      <p><i>Objectives: </i>To review the epidemiological, pathophysiological, and neurological manifestations, as well as the diagnosis and treatment of central nervous system involvement in systemic lupus erythematosus.</p>      <p><i>Methods: A </i>literature search was performed using PubMed database complemented by review of literature references listed in identified articles. There were no limits to publication date of the literature references. Only articles in English and Spanish were included.</p>      ]]></body>
<body><![CDATA[<p><i>Results:</i> Central nervous system involvement is one of the major causes of morbidity and mortality in systemic lupus erythematosus patients. Common disorders (cumulative incidence &gt;5%) were cerebrovascular disease and seizures, and relatively uncommon (1-5%) were severe cognitive dysfunction, acute confusional state, psychosis, while the remaining neuropsychiatric disorders were unusual (less than 1%). Mechanisms that can lead to neuropsychiatric manifestations include intracranial vascular lesions (vasculitis and thrombosis), autoantibody production against neuronal antigens, ribosomes, and phospholipids, and inflammation related to local cytokine production. Serological tests, cerebrospinal fluid, and imaging investigations have been used to support the clinical diagnosis. Treatment is based on the use of corticosteroids, immunosuppressants, and symptomatic treatment. The use of antiplatelet and antithrombotic drugs was indicated when positive moderate-to-high titres of anti-phospholipid antibodies were present.</p>      <p><i>Conusions:</i> The involvement of vital organs and tissues, such as the brain, in patients with systemic lupus erythematosus, impels efforts to develop diagnostic tools for systemic lupus erythematosus associated neuropsychiatric disease to guide effective therapeutic decisions. &copy; 2014 Asociaci&oacute;n Colombiana de Reumatolog&iacute;a. Published by Elsevier Espa&ntilde;a, S.L.U.</p>      <p><i><b>Keywords</b>:</i> Systemic lupus erythematosus Vasculitis, Seizures, Morbidity, Mortality.</p>  <hr>     <p><font size="3"><b>Introducci&oacute;n</b></font></p>      <p>El lupus eritematoso sist&eacute;mico (LES) es una enfermedad auto-inmune caracterizada por la p&eacute;rdida de tolerancia a ant&iacute;genos propios, producci&oacute;n de autoanticuerpos patog&eacute;nicos y da&ntilde;o a m&uacute;ltiples &oacute;rganos<sup>1</sup>. El curso cl&iacute;nico est&aacute;  caracterizado por periodos de remisiones y de reca&iacute;das. Las mujeres se encuentran m&aacute;s frecuentemente afectadas que los hombres, en una raz&oacute;n mujer:hombre de 9:1<sup>2</sup>. La prevalencia oscila entre 10150 casos por cada 100.000 habitantes<sup>3,4</sup>, con una tasa de supervivencia a 10 a&ntilde;os del 70%<sup>4</sup>.</p>      <p>El LES tiene un espectro cl&iacute;nico amplio con una variedad de signos y s&iacute;ntomas que comprometen diferentes &oacute;rganos y sistemas, incluyendo el sistema nervioso central (SNC)<sup>3</sup>. La naturaleza heterog&eacute;nea del LES explica el amplio espectro de subfenotipos (por ejemplo, nefritis l&uacute;pica).</p>      <p>El compromiso neurol&oacute;gico en el LES comprende las diversas manifestaciones psiqui&aacute;tricas y neurol&oacute;gicas que se desarrollan secundarias al da&ntilde;o del SNC. Su importancia cl&iacute;nica radica en el impacto en la mortalidad, en la calidad de vida y en los puntajes de severidad y de da&ntilde;o org&aacute;nico<sup>5</sup>.</p>      <p>El LES neuropsiqui&aacute;trico (LESNP) puede preceder, coincidir o seguir al diagn&oacute;stico de LES, pero com&uacute;nmente (50-60%) se produce en el primer a&ntilde;o despu&eacute;s del diagn&oacute;stico de LES, en presencia de actividad generalizada de la enfermedad (40-50%)<sup>6</sup>.</p>      <p>El art&iacute;culo busca realizar una revisi&oacute;n narrativa de los criterios diagn&oacute;sticos, epidemiolog&iacute;a, fisiopatolog&iacute;a, manifestaciones cl&iacute;nicas, m&eacute;todos diagn&oacute;stico y tratamiento de pacientes con LESNP.</p>      <p><font size="3"><b>M&eacute;todos</b></font></p>      ]]></body>
<body><![CDATA[<p>Se realiz&oacute;  una revisi&oacute;n de la literatura en PubMed de revisiones y meta-an&aacute;lisis publicados hasta julio de 2013, que incluyeran solo adultos. La b&uacute;squeda fue limitada a idiomas espa&ntilde;ol e ingl&eacute;s, incluyendo combinaciones de los siguientes t&eacute;rminos: &laquo;systemic lupus erythemathosus&raquo; &#91;Mesh&#93;, &laquo;central nervous system&raquo; &#91;Mesh&#93;, &laquo;Neuropsychiatric Systemic Lupus Erythematosus&raquo; &#91;Majr&#93;. La informaci&oacute;n fue recolectada de los art&iacute;culos: epidemiolog&iacute;a, manifestaciones cl&iacute;nicas, enfoque diagn&oacute;stico y terap&eacute;utico de pacientes con LES y compromiso del SNC (<a href="#fig1">fig. 1</a>).</p>       <p align="center"><a name="fig1"><img src="img/revistas/rcre/v22n1/v22n1a04f1.jpg"></a></p>      <p><b><i>Definici&oacute;n y criterios diagn&oacute;sticos</i></b></p>      <p>En 1999 el Colegio Americano de Reumatolog&iacute;a (ACR, por sus siglas en ingl&eacute;s) define 19 s&iacute;ndromes cl&iacute;nicos dentro de las manifestaciones neuropsiqui&aacute;tricas del LES<sup>7,8</sup>, con el fin de estandarizar la evaluaci&oacute;n diagn&oacute;stica cl&iacute;nica y paracl&iacute;nica (t&eacute;cnicas de imagen y test neurosicol&oacute;gico), que se le deber&iacute;a realizar a un paciente con LES. Doce de estas manifestaciones son espec&iacute;ficas del SNC e incluyen meningitis as&eacute;ptica, enfermedad cerebrovascular, s&iacute;ndromes desmielinizantes, cefalea (incluyendo migra&ntilde;a e hipertensi&oacute;n endocraneana benigna), trastornos del movimiento (corea), mielopat&iacute;a, convulsiones, estado confusional agudo, trastorno de ansiedad, disfunci&oacute;n cognitiva, trastorno del &aacute;nimo y psicosis<sup>6,7,9</sup>.</p>      <p>Cl&aacute;sicamente los criterios del ACR han sido ampliamente usados en el diagn&oacute;stico de los pacientes con LES, contando con un 85% de sensibilidad y un 95% de especificidad<sup>10,11</sup>, siempre y cuando el paciente cumpla 4 de los 11 criterios (<a href="#tab1">tabla 1</a>).</p>      <p align="center"><a name="tab1"><img src="img/revistas/rcre/v22n1/v22n1a04t1.jpg"></a></p>      <p>En los &uacute;ltimos a&ntilde;os, grupos como el SLICC<sup>12</sup> han revisado y evaluado los criterios propuestos por el ACR en 1982 y proponen una nueva clasificaci&oacute;n en la cual se incluyen manifestaciones no tenidas en cuenta previamente (<a href="#tab2">tabla 2</a>).</p>      <p align="center"><a name="tab2"><img src="img/revistas/rcre/v22n1/v22n1a03t2.jpg"></a></p>      <p>El diagn&oacute;stico de lupus seg&uacute;n los criterios del SLICC se hace si el paciente cumple 4 de los criterios anteriormente listados o si presenta nefritis l&uacute;pica probada por biopsia m&aacute;s la presencia de ANAS o anti-ADNds. Estos tienen una sensibilidad del 97% y una especificidad del 84%<sup>7</sup>.</p>      <p>Vale la pena resaltar que en los criterios diagn&oacute;sticos del SLICC, en cuanto a manifestaciones neuropsiqui&aacute;tricas se refiere, incluye un mayor n&uacute;mero de t&oacute;picos sumado a psicosis y convulsiones, y evita incluir algunos s&iacute;ndromes neuropsiqui&aacute;tricos que no son espec&iacute;ficos del LES pero que son tenidos en cuenta por los criterios del ACR.</p>      ]]></body>
<body><![CDATA[<p><b><i>Epidemiolog&iacute;a</i></b></p>      <p>El LESNP se asocia a gran morbilidad (inmunosupresi&oacute;n, discapacidad y deterioro de calidad de vida) y mortalidad<sup>13,14</sup>. La prevalencia de manifestaciones neuropsiqui&aacute;tricas es del 30-40% (<a href="#tab3">tabla 3</a>)<sup>15</sup>. La prevalencia de los s&iacute;ntomas neuropsiqui&aacute;tricos se ha estimado en un rango del 4% hasta el 91%<sup>16-19</sup>. Las diferencias en los datos reportados se han atribuido a diferencias en los dise&ntilde;os de estudios, en la definici&oacute;n de los casos, y a la ausencia de m&eacute;todos diagn&oacute;sticos espec&iacute;ficos. Asimismo, existe dificultad para atribuir los s&iacute;ntomas directamente a actividad del LES o determinar si son secundarios a reacciones adversas al tratamiento, manifestaciones sist&eacute;micas o infecciones<sup>19</sup>.</p>      <p align="center"><a name="tab3"><img src="img/revistas/rcre/v22n1/v22n1a04t3.jpg"></a></p>      <p>Los factores de riesgo que se han encontrado asociados a la presencia de manifestaciones neuropsiqui&aacute;tricas en pacientes con LES son, principalmente, 3, e incluyen la actividad sist&eacute;mica del LES y da&ntilde;o de &oacute;rgano (sin incluir SNC) con &iacute;ndices de severidad elevados, actividad serol&oacute;gica y tratamiento con altas dosis de esteroides<sup>15</sup>. En segundo lugar, la presencia previa o concurrente de eventos neuropsiqui&aacute;tricos, y por &uacute;ltimo la presencia de anticuerpos antifosfol&iacute;pidos (anticardiolipinas, anti 02 glucoprote&iacute;na o anticoagulante l&uacute;pico) persistentemente positivos<sup>6</sup>.</p>      <p>Latinoam&eacute;rica, por su parte, a&uacute;n se encuentra en la realizaci&oacute;n de estudios que le permitan caracterizar epidemiol&oacute;gicamente a la poblaci&oacute;n que padece lupus, y grupos como el Grupo Latinoamericano de Estudio de Lupus (GLADEL) encabezan estos estudios. En una de sus publicaciones reportan las diferencias &eacute;tnicas de acuerdo al &oacute;rgano comprometido. Espec&iacute;ficamente, el compromiso del SNC se presenta m&aacute;s en pacientes de raza mestiza, diferencias que se atribuyen a variables socio-econ&oacute;micas y a cuidado m&eacute;dico<sup>4</sup>.</p>      <p><b><i>Fisiopatolog&iacute;a</i></b></p>      <p>La patog&eacute;nesis del LESNP es desconocida. Sin embargo, es poco probable que un mecanismo patog&eacute;nico sea exclusivamente causal en la gran variedad de s&iacute;ndromes de LESNP. La <a href="#fig2">figura 2</a> muestra los mecanismos patog&eacute;nicos postulados que causan los s&iacute;ntomas neuropsiqui&aacute;tricos en el LES.</p>      <p align="center"><a name="fig2"><img src="img/revistas/rcre/v22n1/v22n1a04f2.jpg"></a></p>      <p>Dentro de estos mecanismos se encuentran:</p> <ol>    <li>    ]]></body>
<body><![CDATA[<p><i>Vasculopat&iacute;a. </i>Se ha logrado establecer que m&aacute;s que un proceso de vasculitis, lo que ocurre es un proceso de vasculopat&iacute;a, en el cual se acumulan m&uacute;ltiples c&eacute;lulas mononucleares alrededor de los vasos sangu&iacute;neos, se generan cambios proliferativos de la &iacute;ntima y se produce hialinizaci&oacute;n vascular, propiciando alteraciones en la barrera hematoencef&aacute;lica, lo que permite el paso de auto-anticuerpos al SNC o genera peque&ntilde;os infartos debido a oclusi&oacute;n luminal<sup>20-22</sup>.</p>      <p>M&uacute;ltiples microinfartos, engrosamiento no inflamatorio de vasos peque&ntilde;os con proliferaci&oacute;n intimal, oclusi&oacute;n de peque&ntilde;os vasos y embolia o hemorragia intracraneal, son manifestaciones vasculares encontradas en pacientes con LES<sup>5</sup>.</p></li>     <li>    <p><i>Autoanticuerpos. </i>M&uacute;ltiples anticuerpos han sido implicados en la fisiopatolog&iacute;a de la enfermedad, como colaboradores en la vasculopat&iacute;a, adem&aacute;s de favorecer la lesi&oacute;n neuronal directa<sup>23</sup>:</p> <ol type="a">       <li>Anticuerpos antiribosomales P: compromiso difuso del SNC.</li>     <li>Anticuerpos antifosfol&iacute;pidos (anti B1 glucoprote&iacute;na, anticardiolipinas, anticoagulante l&uacute;pico): relacionados con manifestaciones locales tales como enfermedad cerebrovascular, convulsiones, trombosis venosas y disfunci&oacute;n cognitiva.</li>     <li>Anticuerpos antineuronales: se han relacionado con psicosis y convulsiones. El 45% de los pacientes con LES y con compromiso del SNC presentan estos anticuerpos, en contraste con solo el 5% de pacientes con LES sin manifestaciones neuropsiqui&aacute;tricas<sup>20,24</sup>.</li>     <li>Otros anticuerpos que se han encontrado asociados con LESNP son los anticuerpos antigangli&oacute; sido, antineurofilamento, antiprote&iacute;na &aacute;cida fibrilar glial, anti SM, anti receptores de NMDA y anti histona<sup>25</sup>.</li>     </ol></p></li>     <li>    ]]></body>
<body><![CDATA[<p><i>Disfunci&oacute;n de plexo coroideo. </i>El plexo coroideo posee c&eacute;lulas gliales que tienen receptores de complejos inmunes, con evidencia de dep&oacute;sito de complemento e IgG<sup>20</sup>.</p></li>     <li>    <p><i>Procesos pro-inflamatorios. </i>Los efectos de las citoquinas tienen un papel en la patog&eacute;nesis del LESNP. Se han encontrado niveles de IL-2, IL-10, IFN alfa y gamma elevados en el suero de pacientes con LESNP, e IL-1, IL-2, IL-6, IL-8, IL-10 TNF-a e IFNa en el l&iacute;quido cefalorraqu&iacute;deo (LCR)<sup>26</sup>.</p></li>     <li>    <p><i>Efectos inmunes neuroendocrinos. </i>Se cree que el LES activo puede dar lugar a una respuesta de estr&eacute;s cr&oacute;nico, con la activaci&oacute;n resultante de los sistemas noradren&eacute;rgico y del eje hipot&aacute;lamo-hip&oacute;fisis-adrenal<sup>20</sup>.</p></li>     <li>       <p><i>Da&ntilde;o directo sobre el SNC. </i>Metaloproteinasas, estr&eacute;s oxidativo y toxicidad de amino&aacute;cidos excitadores<sup>20</sup>.</p> </li>     <li>    <p><i>Factores fisiopatol&oacute;gicos no inmunol&oacute;gicos. </i>Hasta el 70% de las manifestaciones neurol&oacute;gicas pueden ser debidas a infecciones del SNC<sup>27</sup>, ya sea por g&eacute;rmenes oportunistas como por no oportunistas, complicaciones metab&oacute;licas debido a uremia, hiperglucemia o manifestaciones relacionadas con la terapia con corticosteroides u otros inmunosupresores<sup>23</sup>.</p></li>    </ol>     ]]></body>
<body><![CDATA[<p>La autoinmunidad y la inflamaci&oacute;n son respuestas inmunol&oacute;gicas que pueden afectar la funci&oacute;n y la morfolog&iacute;a de las c&eacute;lulas del SNC<sup>28,29</sup>. Cambios estructurales, factores neuropatog&eacute;nicos, neurodegeneraci&oacute;n y activaci&oacute;n de c&eacute;lulas B y T pueden explicar los mecanismos autoinmunes e inflamatorios involucrados en el da&ntilde;o del SNC<sup>30-32</sup> que pueden ocurrir en el LES (<a href="#tab4">tabla 4</a>).</p>      <p align="center"><a name="tab4"><img src="img/revistas/rcre/v22n1/v22n1a04t4.jpg"></a></p>      <p><font size="3"><b>Manifestaciones cl&iacute;nicas</b></font></p>      <p>A continuaci&oacute;n se describen las manifestaciones cl&iacute;nicas neurol&oacute;gicas y psiqui&aacute;tricas que comprometen el SNC.</p>      <p><b><i>Cefalea</i></b></p>      <p>Es motivo de controversia su inclusi&oacute;n como manifestaci&oacute;n del LES, dado que no se ha logrado probar una clara relaci&oacute;n de este s&iacute;ntoma con actividad de la enfermedad y su prevalencia no parece ser mayor que la presentada por la poblaci&oacute;n general<sup>10,33</sup>. Varios estudios han dilucidado la prevalencia de esta manifestaci&oacute;n y la ubican en un rango del 32 al 78%<sup>34</sup>. Su incidencia acumulada corresponde entre el 10 y el 20%, encontr&aacute;ndose con mayor frecuencia en cauc&aacute;sicos (20-40%) y menor en asi&aacute;ticos (3-5%), siendo los tipos m&aacute;s frecuentes la migra&ntilde;a, la cefalea tipo tensi&oacute;n y la cefalea por hipertensi&oacute;n endocraneana<sup>35,36</sup>.</p>      <p>La cefalea no se relaciona con la actividad l&uacute;pica o anticuerpos antifosfol&iacute;pidos en suero ni con el fen&oacute;meno de Raynaud, pero se requieren investigaciones posteriores al respecto. Las manifestaciones neurol&oacute;gicas del lupus no se relacionan con un tipo espec&iacute;fico de cefalea. La cefalea puede estar asociada a ansiedad y depresi&oacute;n<sup>35</sup>. Teniendo en cuenta lo anterior, la cefalea en un paciente con LES debe valorarse y clasificarse igual que en un paciente sin LES. El ACR la considera como una manifestaci&oacute;n neuropsiqui&aacute;trica del LES y se adhiere a la definici&oacute;n propuesta por la Sociedad Internacional de Cefalea <i>(International Headache Society </i>&#91;IHS&#93;)<sup>37</sup>.</p>      <p>El abordaje inicial debe hacerse igual al de un paciente que no padezca LES<sup>15</sup>, es decir, realizando b&uacute;squeda activa de causas de cefalea secundaria y, en caso de que cl&iacute;nicamente est&eacute;  indicado, deben realizarse neuroim&aacute;genes y estudio del LCR. Es importante resaltar patolog&iacute;as como meningitis as&eacute;ptica, trombosis de senos venosos y hemorragia subaracnoidea, que se pueden manifestar inicialmente con cefalea<sup>6</sup>.</p>      <p>Una menci&oacute;n especial refiere el t&eacute;rmino &laquo;cefalea l&uacute;pica&raquo;, que si bien como se mencion&oacute;  antes no existe suficiente evidencia hasta el momento que soporte su uso sistem&aacute;tico, se encuentra incluido dentro de los criterios de actividad l&uacute;pica del SLEDAI (acr&oacute;nimo de &Iacute;ndice de Actividad de Enfermedad de LES) y la refieren como una cefalea severa, incapacitante, persistente, que no responde al manejo con analg&eacute;sicos narc&oacute;ticos, que sigue a la actividad de la enfermedad y cede con corticosteroides<sup>3</sup>.</p>      <p><b><i>Meningitis as&eacute;ptica</i></b></p>      ]]></body>
<body><![CDATA[<p>La meningitis as&eacute;ptica se define como la meningitis con cultivos bacterianos negativos en LCR<sup>38,39</sup>. Los mecanismos etiol&oacute;gicos incluyen infecciones, vacunas, medicamentos, neoplasias (<a href="#tab5">tabla 5</a>)<sup>40</sup>.</p>      <p align="center"><a name="tab5"><img src="img/revistas/rcre/v22n1/v22n1a04t5.jpg"></a></p>      <p>Las manifestaciones cl&iacute;nicas incluyen fiebre, cefalea, signos men&iacute;ngeos, LCR con pleocitosis y cultivos negativos<sup>38</sup>. Es una entidad rara en pacientes con LES, en la que se han encontrado etiolog&iacute;as como <i>Mycobacterium tuberculosis, Criptococcus neoformans, </i>linfopenia, actividad sist&eacute;mica del LES<sup>41</sup>, uso de esteroides y antiinflamatorios no esteroideos<sup>42</sup>. El tratamiento es de soporte en las causas infecciosas y en las no infecciosas; adem&aacute;s, se debe suspender el medicamento relacionado o tratar la causa subyacente<sup>40</sup>. Los esteroides tambi&eacute;n se han usado en esta entidad<sup>43</sup>.</p>      <p><b><i>Enfermedad cerebrovascular</i></b></p>      <p>La enfermedad cerebrovascular en paciente con LES se ve en el 7-10% de los pacientes cauc&aacute;sicos y afroamericanos, y en el 4-8% de los pacientes hispanos<sup>44</sup>. Los tipos de ataque cerebrovasculares (ACV) que se observan con mayor frecuencia en pacientes con LES son el ACV isqu&eacute;mico, el ataque isqu&eacute;mico transitorio (&gt;80%), la enfermedad multifocal (7-12%), la hemorragia intracraneal (3-5%) y la trombosis de senos venosos (2%)<sup>45</sup>. Los pacientes con LES tienen riesgo incrementado de ACV con respecto a la poblaci&oacute;n general. Los factores de riesgo asociados son la actividad del lupus con un puntaje de SLEDAI mayor o igual a 6 (HR 2,1; IC95%: 1,0-4,6), la presencia de anticuerpos antifosfol&iacute;pidos (OR 4,3-22,2) y enfermedad valvular cardiaca (OR 7,1-8,3)<sup>6,46</sup>.</p>      <p>La presencia de ACV en LES se atribuye a angiopat&iacute;a de peque&ntilde;o vaso, a formaci&oacute;n de autoanticuerpos contra ant&iacute;genos neuronales, ribosomales y fosfolip&iacute;dicos, a producci&oacute;n intratecal de mediadores inflamatorios, a ateroesclerosis prematura, a trombosis venosa y arterial, a embolismo, a disecci&oacute;nyavasculitis<sup>13,47</sup>.</p>      <p>Los pacientes con LES tienen mayor riesgo de ACV comparado con la poblaci&oacute;n general (RR 7,9; IC 95%: 4,0-13,6)<sup>48</sup>, el cual es atribuido a ateroesclerosis temprana, coagulopat&iacute;a, vasculitis y embolismos cardiog&eacute;nicos. El ACV y/o AIT comprenden el 80% de los casos, la enfermedad multifocal el 7-12%, la hemorragia cerebral el 7-12%, la hemorragia subaracnoidea el 3-5% y la trombosis de senos venosos el 2%<sup>15</sup>. Adem&aacute;s de los factores de riesgo independientes del LES (edad, hipertensi&oacute;n, diabetes mellitus), la actividad y la duraci&oacute;n del LES y la presencia de anticuerpos anticardiolipinas se han encontrado asociados<sup>6</sup>.</p>      <p>Las im&aacute;genes se deben realizar para excluir hemorragias, determinar el da&ntilde;o cerebral e identificar la lesi&oacute;n vascular responsable del d&eacute;ficit neurol&oacute;gico. El tratamiento es similar al de pacientes sin LES, tromb&oacute;lisis o cirug&iacute;a seg&uacute;n indicaci&oacute;n, y el control de factores de riesgo en la prevenci&oacute;n secundaria. El tratamiento se diferencia en la necesidad de anticoagulaci&oacute;n o antiagregaci&oacute;n ante la presencia de anticuerpos anticardiolipinas o del uso de esteroides e inmunosupresores ante la actividad severa del LES<sup>15</sup>.</p>      <p><b><i>Enfermedad desmielinizante</i></b></p>      <p>La mielopat&iacute;a en pacientes con LES se ve en el 40-50% de los pacientes entre 2-4 a&ntilde;os despu&eacute;s del inicio del diagn&oacute;stico. La presentaci&oacute;n m&aacute;s frecuente es la mielopat&iacute;a transversa aguda. El factor de riesgo que se ha encontrado asociado es la positividad en los anticuerpos anticardiolipinas (OR 9,6; IC 95%: 1,8-50,7)<sup>6</sup>.</p>      ]]></body>
<body><![CDATA[<p>Cursa con la aparici&oacute;n de lesiones inflamatorias focales en la sustancia blanca cerebral, provocando el funcionamiento anormal de las fibras nerviosas en las v&iacute;as neuronales (motoras, sensoriales, visuales, etc.) y produciendo d&eacute;ficit neurol&oacute;gico y discapacidad cl&iacute;nica seg&uacute;n la localizaci&oacute;n topogr&aacute;fica de la lesi&oacute;n<sup>39</sup>.</p>      <p>El tratamiento incluye la combinaci&oacute;n de metilprednisolona y ciclofosfamida intravenosa, con mayor eficacia en las primeras horas<sup>6</sup>. Las reca&iacute;das pueden ocurrir y requerir terapia inmunosupresora de mantenimiento. La plasmaf&eacute;resis se ha usado en casos severos o refractarios<sup>49</sup>, as&iacute;  como la anticoagulaci&oacute;n en mielopat&iacute;a asociada a antifosfol&iacute;pidos<sup>6</sup>.</p>      <p><b><i>D&eacute;ficit cognitivo</i></b></p>      <p>La disfunci&oacute;n cognitiva incluye compromiso en la atenci&oacute;n, razonamiento, funciones ejecutivas (planeaci&oacute;n, organizaci&oacute;n, secuenciaci&oacute;n), memoria, procesamiento visuoespacial, lenguaje o velocidad psicomotora<sup>39,50</sup>. Esta manifestaci&oacute;n es m&aacute;s com&uacute;n en cauc&aacute;sicos (10-20%)<sup>51</sup>. En pacientes con LES se observa un compromiso leve a moderado; se evidencia mayor compromiso en dominios de atenci&oacute;n, memoria visual/verbal, y constituye un gran impacto en el funcionamiento laboral, educacional o social<sup>52</sup>. Los factores de riesgo asociados con la actividad l&uacute;pica con SLEDAI &gt; 16 (OR 13,4; IC95%: 4,0-36,6), con da&ntilde;o por lupus evaluado por &iacute;ndice de SLICC &gt; 1,0 (OR 6,8; IC 95%: 2,0-23,6), anticuerpos anticardiolipinas<sup>53,54</sup>.</p>      <p>La presencia de anticuerpos antineuronales como el receptor de N-Metil-D-aspartato, antiribosomales P, anticuerpos antifosfol&iacute;pidos, mediadores inflamatorios como citoquinas y metaloproteasas, polimorfismos en el gen del factor neurotr&oacute;fico cerebral, da&ntilde;o de sustancia blanca y gris, da&ntilde;o cr&oacute;nico y actividad de la enfermedad, han sido mecanismos asociados con el d&eacute;ficit cognitivo en pacientes con LES<sup>55,56</sup>.</p>      <p>Las pruebas neuropsicol&oacute;gicas deben realizarse ante su sospecha, previa evaluaci&oacute;n de diagn&oacute;sticos diferenciales como abuso de sustancias, tratamiento (sedantes, esteroides), historia de problemas de aprendizaje, trauma craneoencef&aacute;lico, lesiones estructurales o vasculares del SNC, alteraciones metab&oacute;licas. As&iacute;  mismo, se encontrar&aacute;  atrofia cerebral, lesiones en T2 e infartos cerebrales en la resonancia nuclear magn&eacute;tica (RNM). Debe considerarse la realizaci&oacute;n prioritaria de RNM si el paciente es menor de 60 a&ntilde;os, el deterioro cognitivo fue r&aacute; pido, tiene d&eacute;ficit neurol&oacute;gico focal, presencia de anticardiolipinas o de otra manifestaci&oacute;n neuropsiqui&aacute;trica concomitante<sup>15</sup>.</p>      <p>El tratamiento incluye soporte psico-educativo, control de la actividad de LES, de factores de riesgo cardiovascular y de depresi&oacute;n, y anticoagulaci&oacute;n si existe positividad serol&oacute;gica de anticardiolipinas<sup>15</sup>.</p>      <p><b><i>Psicosis</i></b></p>      <p>Esta manifestaci&oacute;n se caracteriza por tener una severa alteraci&oacute;n de la percepci&oacute;n de la realidad. Los episodios psic&oacute;ticos en pacientes con LES ocurren al inicio o al primer a&ntilde;o de diagn&oacute;stico de la enfermedad y se caracterizan por presentar ilusiones o alucinaciones con impacto en el funcionamiento social y laboral<sup>57</sup>. La actividad del lupus y la asociaci&oacute;n con otras manifestaciones psiqui&aacute;tricas son factores de riesgo asociados con su aparici&oacute;n<sup>54</sup>.</p>      <p>Su diagn&oacute;stico se hace al excluir otras etiolog&iacute;as, como enfermedad estructural o infecciosa del SNC, medicamentos o abuso de drogas psicoativas u otra enfermedad mental<sup>39</sup>. Durante la evaluaci&oacute;n de cualquier paciente psic&oacute;tico debe considerarse la enfermedad sist&eacute;mica org&aacute;nica. La psicosis en LES puede presentarse como paranoia con alucinaciones visuales y auditivas; la recuperaci&oacute;n generalmente es completa y no es frecuente observar reca&iacute;das<sup>58</sup>.</p>      ]]></body>
<body><![CDATA[<p>La psicosis suele atribuirse al da&ntilde;o mediado por desregulaci&oacute;n autoinmune, aunque pueden estar involucradas las alteraciones metab&oacute;licas o los medicamentos<sup>52</sup>. Se ha reportado que del 1,3 al 5% de los pacientes con LES y psicosis se encuentran relacionados con la terapia con corticosteroides a dosis altas<sup>59</sup> o antimal&aacute;ricos<sup>60</sup>. Sin embargo, la presencia de otras manifestaciones del SNC asociadas a anticuerpos antifosfol&iacute;pidos y actividad del LES se asocia con mayor frecuencia a psicosis en comparaci&oacute;n con psicosis inducida por corticosteroides<sup>61</sup>.</p>      <p><b><i>Depresi&oacute;n</i></b></p>      <p>La depresi&oacute;n en pacientes con LES ocurre m&aacute;s frecuentemente en cauc&aacute;sicos (10-20%) comparados con pacientes asi&aacute;ticos (1-2%), con tasas superiores de prevalencia con respecto a pacientes sanos o con otras enfermedades autoinmunes como artritis reumatoide<sup>6</sup>.</p>      <p>Se ha demostrado que la depresi&oacute;n es una expresi&oacute;n cl&iacute;nica de activaci&oacute;n celular perif&eacute;rica, inflamaci&oacute;n, inducci&oacute;n de estr&eacute;s oxidativo, activaci&oacute;n de microglias, disminuci&oacute;n de neurog&eacute;nesis y aumento de apoptosis<sup>62</sup>.</p>      <p>En el LES, el sistema inmune se activa, as&iacute;  como la producci&oacute;n de citoquinas pro inflamatorias que afectan el metabolismo de la serotonina<sup>63</sup>. As&iacute;  mismo, estas citoquinas est&aacute;n involucradas en alteraciones en la bios&iacute; ntesis de neurotransmisores como las catecolaminas, la dopamina y la epinefrina<sup>63,64</sup>, y son responsables de la hiperactividad del eje hipot&aacute;lamo-pituitaria-adrenal y de los s&iacute;ntomas neurovegetativos<sup>65</sup>.</p>      <p>La depresi&oacute;n en pacientes con LES se encuentra estimada en m&aacute;s del 20% y cumple un papel importante en la predicci&oacute;n de actividad de la enfermedad<sup>66,67</sup>. Tambi&eacute;n se ha demostrado la depresi&oacute;n como una causa de problemas de adherencia al tratamiento<sup>68</sup> y se encuentra asociada con una peor funci&oacute;n cognitiva<sup>69</sup>.</p>      <p>La asociaci&oacute;n entre LES y trastornos del &aacute;nimo se ha explicado por altas dosis de corticoides, estr&eacute;s fisiol&oacute;gico, discapacidad propia producida por la enfermedad y autoanticuerpos contra el tejido neuronal y anti-ribosomales p<sup>58,66</sup>.</p>      <p><b><i>Ansiedad</i></b></p>      <p>En la mayor&iacute;a de los pacientes con LES, la ansiedad es secundaria al estr&eacute;s y no una manifestaci&oacute;n directa<sup>39</sup>. Factores de riesgo para su aparici&oacute;n incluyen la afectaci&oacute;n del SNC, da&ntilde;o cerebral directo, trastornos neuropsiqui&aacute;tricos concomitantes, administraci&oacute;n de esteroides, autoanticuerpos y la respuesta del paciente a la carga de la enfermedad<sup>58</sup>.</p>      <p>Para el tratamiento, ha reportado eficacia el uso de las terapias sintom&aacute;ticas, inmunosupresores, anticoagulantes y medicamentos psicotr&oacute;picos adyuvantes<sup>58</sup>. El tratamiento cognitivo-conductual asistido tiene un impacto favorable sobre los s&iacute;ntomas. En la actividad del LES generalizado, la combinaci&oacute;n de los glucocorticoides y la terapia inmunosupresora (por lo general ciclofosfamida, seguido de mantenimiento con azatioprina) resulta en una mejora significativa<sup>6</sup>.</p>      ]]></body>
<body><![CDATA[<p><b><i>Estado confusional agudo</i></b></p>      <p>La frecuencia de aparici&oacute;n de esta manifestaci&oacute;n en pacientes con LES va del 1,8 al 4,7%, generalmente asociada con actividad generalizada de la enfermedad, junto con estados tanto de hiperactividad como hipoactividad<sup>6</sup>.</p>      <p>Ante la presencia de cambios en el estado mental en pacientes con LES, se debe realizar la misma valoraci&oacute;n que en otros pacientes, con especial consideraci&oacute;n hacia la realizaci&oacute;n temprana de im&aacute;genes. Adem&aacute;s, para los pacientes que est&aacute;n siendo tratados con terapia inmunosupresora debe llevarse a cabo una evaluaci&oacute;n exhaustiva de las infecciones<sup>10</sup>. Si no existe causa subyacente aparente o solo se evidencia actividad l&uacute;pica, el tratamiento consiste en el uso de esteroides, inmunomoduladores y antipsic&oacute;ticos<sup>15</sup>.</p>      <p><b><i>Movimientos anormales</i></b></p>      <p>La presencia de movimientos anormales en pacientes con LES puede corresponder a uno de los signos tempranos de compromiso de SNC, con una edad promedio de presentaci&oacute;n entre los 20 y 30 a&ntilde;os <sup>6</sup>. La corea es la manifestaci&oacute;n m&aacute;s frecuente, siendo m&aacute;s raros el hemibalismo y el s&iacute;ndrome parkinsoniano<sup>70</sup>. Los anticuerpos anti-cardiolipinas presentes incrementan el riesgo de aparici&oacute;n de esta entidad (OR 10,5; IC 95%: 1,1-102)<sup>54</sup>.</p>      <p>Como diagn&oacute;stico diferencial se encuentran las enfermedades de Wilson, Huntington, medicamentos (neurol&eacute;pticos, anticonceptivos orales, fenito&iacute; na, L-dopa, bloqueadores de canales de calcio) y drogas psicoactivas<sup>39</sup>.</p>      <p>Histol&oacute;gicamente, hay evidencia para apoyar una fisiopatolog&iacute;a mediada por anticuerpos y patolog&iacute;a isqu&eacute;mica en los dem&aacute;s<sup>10</sup>. La patog&eacute;nesis de la corea no est&aacute;  clara, pero puede involucrar interacciones directas de anticuerpos antifosfol&iacute;pidos con estructuras neuronales en los ganglios basales<sup>52</sup>.</p>      <p>El tratamiento sintom&aacute;tico con antagonistas de la dopamina es generalmente eficaz y los glucocorticoides en combinaci&oacute;n con agentes inmunosupresores pueden usarse en presencia de actividad del LES<sup>6</sup>.</p>      <p><b><i>Convulsiones</i></b></p>      <p>Las crisis epil&eacute;pticas se presentan con mayor frecuencia en pacientes con LES que en la poblaci&oacute;n general (OR 4,0). La mayor&iacute;a son episodios &uacute;nicos, siendo la recurrencia poco frecuente (12-22%)<sup>71</sup>. Diferentes factores se han asociado con mayor presencia de crisis epil&eacute;pticas en LES, como la actividad l&uacute;pica con SLEDAI &gt; 15 (OR 3,2; IC95%: 1,1-11,2), anticuerpos anticardiolipinas, anticuerpo anti-Smith, raza afroamericana<sup>54,72</sup>.</p>      ]]></body>
<body><![CDATA[<p>La fisiopatolog&iacute;a de las crisis en el LES no est&aacute;  completamente dilucidada. Existen estudios que sugieren un efecto directo de anticuerpos sobre las neuronas, que causan su disfunci&oacute;n, mientras que otros estudios sugieren que se debe a la isquemia focal o a infartos resultantes de la oclusi&oacute;n vascular secundaria a la trombosis, embolia, hemorragia o vasculopat&iacute;a mediada por anticuerpos antifosfol&iacute;pidos<sup>10,52</sup>. As&iacute;  mismo, se ha involucrado la secreci&oacute;n de citoquinas proinflamatorias (tales como la interleucina &#91;IL&#93; 1 y 6, y factor de necrosis tumoral-a &#91;FNT-a&#93;), que conduce a la activaci&oacute;n del eje hipotal&aacute;mico-hipofisario suprarrenal, con la consiguiente reducci&oacute;n del umbral de convulsiones<sup>73</sup>.</p>      <p>Factores de riesgo asociados a su aparici&oacute;n son la actividad generalizada del LES, presencia de anticuerpos s&eacute;ricos contra fosfol&iacute;pidos y compromiso renal, y antecedente previo de psicosis.</p>      <p>Para su evaluaci&oacute;n y clasificaci&oacute;n se debe conocer la semiolog&iacute;a de la crisis, lo que permite un enfoque terap&eacute;utico, as&iacute;  como realizar el diagn&oacute;stico diferencial con s&iacute;ncope, histeria, hiperventilaci&oacute;n, tics, narcolepsia, abstinencia de alcohol o drogas de abuso, hemorragia subaracnoidea, uso de medicamentos como quinolonas e imipenem, trauma, hipoglucemia, hiponatremia o trastornos conversivos<sup>6,39,52</sup>. El electroencefalograma es una herramienta diagn&oacute;stica; sin embargo, puede ser normal en per&iacute;odos interictales e incluso durante crisis parciales simples. La realizaci&oacute;n de neuroim&aacute;genes sirve para descartar la presencia de lesiones estructurales y, en algunos casos, como parte del diagn&oacute;stico se puede realizar prueba terap&eacute;utica y determinar la respuesta a medicamentos anticonvulsivantes si existen crisis recurrentes. Si solo son debidas a actividad de LES, se manejan con esteroides o inmunosupresores<sup>15</sup>.</p>      <p><font size="3"><b>Diagn&oacute;stico</b></font></p>      <p>La primera herramienta, y de gran utilidad, es una adecuada anamnesis y examen f&iacute;sico dirigidos, esto es especialmente cierto en las manifestaciones neuropsiqui&aacute;tricas del LES, en el cual un examen neurol&oacute;gico exhaustivo permitir&aacute;  orientar o llegar al diagn&oacute;stico etiol&oacute;gico y, paralelamente, descartar diagn&oacute;sticos diferenciales tales como infecci&oacute;n, trastornos metab&oacute;licos, hipoglucemia, hiponatremia, trastornos tiroideos, trastornos hep&aacute;ticos, s&iacute;ndromes convulsivos, trastornos cognitivos o psiqui&aacute;tricos<sup>3,6,15</sup>. Algunos ex&aacute;menes paracl&iacute;nicos son de gran utilidad para esto y se enuncian en la <a href="#tab6">tabla 6</a>. El enfoque difiere seg&uacute;n la manifestaci&oacute;n neuropsiqui&aacute;trica (<a href="#fig3">fig 3</a>)<sup>6,15,26,31,74-78</sup></p>       <p align="center"><a name="tab6"><img src="img/revistas/rcre/v22n1/v22n1a04t6.jpg"></a></p>      <p align="center"><a name="fig3"><img src="img/revistas/rcre/v22n1/v22n1a04f3.jpg"></a></p>      <p><b><i>Estudios serol&oacute;gicos</i></b></p>      <p>Ante la presencia de manifestaciones neuropsiqui&aacute;tricas en pacientes con LES, se deben solicitar ex&aacute;menes de laboratorio para excluir otras patolog&iacute;as, as&iacute;  como marcadores de actividad del LES como anti-ADN y complemento.</p>      <p>Se ha encontrado asociaci&oacute;n entre s&iacute;ntomas neuropsiqui&aacute;tricos y anticuerpos espec&iacute;ficos. Se han descrito 20 anticuerpos (11 espec&iacute;ficos del cerebro y 9 sist&eacute;micos) en pacientes con LESNP. Estos incluyen anticuerpos que se dirigen contra los ant&iacute;genos espec&iacute;ficos del cerebro (neuronal, gangli&oacute; sido, sinaptosomas, gl&iacute;a, receptores metil-D-aspartato, linfocitot&oacute;xicos) y ant&iacute;genos sist&eacute;micos (fosfol&iacute;pidos, c&eacute;lulas nucleares, citopl&aacute;smicos, endoteliales)<sup>79</sup>. No se encontr&oacute;  especificidad entre los anticuerpos espec&iacute;ficos del cerebro o sist&eacute;micos para cualquiera de las manifestaciones neuropsiqui&aacute;tricas<sup>79</sup>.</p>      ]]></body>
<body><![CDATA[<p>El deterioro cognitivo, la psicosis y la depresi&oacute;n se asociaron con muchos anticuerpos. Los t&iacute;tulos elevados de anticuerpos anticardiolipina se reportaron con m&aacute;s frecuencia, y se encontraron en los pacientes con deterioro cognitivo, psicosis, depresi&oacute;n, convulsiones, corea, ACV, mielitis transversa y migrana<sup>44,80</sup>. Los anticuerpos anti-ribos&oacute;micos P se han asociado con psicosis y depresi&oacute;n<sup>81</sup>. Un meta-an&aacute;lisis publicado en 2006 inform&oacute;  que los anticuerpos anti-ribos&oacute;micos P tienen una sensibilidad y una especificidad limitadas (23 y 80%, respectivamente) para el LESNP y no distinguen entre subgrupos (por ejemplo, psicosis frente a la depresi&oacute;n)<sup>82</sup>.</p>      <p>Por otra parte, el anticuerpo anti-N-metil-D-aspartato (NMDA) se encuentra presente en pacientes con varias manifestaciones neuropsiqui&aacute;tricas, incluyendo disfunci&oacute;n cognitiva y depresi&oacute;n<sup>83</sup>, pero su asociaci&oacute;n con otras manifestaciones no ha sido concluyente. Los anticuerpos antigangli&oacute;sidos se encuentran presentes en pacientes con cefalea<sup>84</sup>.</p>      <p><b><i>Pruebas neuropsicol&oacute;gicas</i></b></p>      <p>La evaluaci&oacute;n psicom&eacute;trica puede ser &uacute;til para diferenciar caracter&iacute;sticas funcionales de la enfermedad org&aacute;nica. Una bater&iacute;a de 11 o 12 pruebas, que requieren de1a4hpara completar, pueden ser utilizadas<sup>85</sup>. El d&eacute;ficit de atenci&oacute;n en pacientes con LESNP fue el principal marcador entre los estudios, as&iacute; como los d&eacute;ficits en el aprendizaje y la memoria de material verbal y no verbal, las funciones psicomotoras verbales y no verbales de fluidez, las habilidades visuoespaciales y la destreza motora<sup>50,55</sup>.</p>      <p><b><i>An&aacute;lisis de l&iacute;quido cefalorraqu&iacute;deo</i></b></p>      <p>La evaluaci&oacute;n de LCR puede ser normal en pacientes con LESNP, excepto en los casos de meningitis as&eacute;ptica, vasculitis y mielitis transversa. Algunos informes, sin embargo, han observado anormalidades inmunol&oacute;gicas, incluyendo niveles elevados de anticuerpos anti-ADN, producci&oacute;n intratecal de IgG, bandas oligoclonales, complejos inmunes e IL-6<sup>26</sup>.</p>      <p><b><i>Electroencefalograf&iacute;a</i></b></p>      <p>Aproximadamente el 80% de los pacientes con lupus activo en SNC tendr&aacute; n un electroencefalograma (EEG) anormal<sup>86</sup>. La actividad de onda lenta difusa es el patr&oacute;n m&aacute;s t&iacute;picamente asociado con encefalopat&iacute;a, mientras que los cambios de actividad se pueden observar en pacientes con convulsiones o problemas neurol&oacute;gicos focales.</p>      <p>La especificidad del EEG, sin embargo, no es tan alta como su sensibilidad. EEG anormales tambi&eacute;n se han observado en pacientes con alteraciones neurol&oacute;gicas con o sin lupus del SNC y en aquellos con lesiones activas e inactivas.</p>      <p><b><i>Estudios de im&aacute;genes</i></b></p>      ]]></body>
<body><![CDATA[<p>Un gran n&uacute;mero de m&eacute;todos de imagen est&aacute;n disponibles para su uso en el diagn&oacute;stico de LESNP, y los m&aacute;s &uacute;tiles son la tomograf&iacute;a computarizada (TAC) y la RNM.</p>      <p>La TAC es &uacute;til para la detecci&oacute;n de anomal&iacute;as estructurales, focales (como infartos, hemorragias, tumores, abscesos y realce men&iacute;ngeo) y atrofia cortical<sup>76</sup>. Es una imagen poco sensible para la evaluaci&oacute;n de manifestaciones como convulsiones, estados de confusi&oacute;n, depresi&oacute;n mayor, trastorno cognitivo, as&iacute;  como para evaluar la sustancia blanca, la presencia de peque&ntilde;os infartos, las lesiones puntiformes, el edema cerebral focal, la mielitis transversa, la lesi&oacute;n cerebral difusa y la leucoencefalopat&iacute;a<sup>76</sup>.</p>      <p>La RNM es m&aacute;s sensible que la TAC y puede revelar anormalidades que reflejan LESNP focal<sup>31</sup>. El protocolo recomendado incluye im&aacute;genes en secuencias T1/T2 convencional, recuperaci&oacute;n de la inversi&oacute;n de l&iacute;quido atenuado (FLAIR), DWI y Di-s mejorados secuencias T1. Es una t&eacute;cnica &uacute;til para excluir la masa cerebral o un absceso, puede descartar una infecci&oacute;n del SNC (realce men&iacute;ngeo) con moderadas sensibilidad (55-60%) y especificidad (50-70%) en pacientes con manifestaciones neuropsiqui&aacute;tricas agudas<sup>6</sup>.</p>      <p>As&iacute;  mismo, la RNM tambi&eacute;n puede revelar lesiones de sustancia blanca periventricular o hiperintensidades en pacientes con LES que no tienen s&iacute;ntomas neuropsiqui&aacute;tricos<sup>87</sup>. Se considera el estudio de neuroimagen m&aacute;s &uacute;til en los pacientes con LES, especialmente en aquellos con defectos neurol&oacute;gicos focales, convulsiones, disfunci&oacute;n cognitiva cr&oacute;nica o s&iacute;ndrome antifosfol&iacute;pido y disfunci&oacute;n neurol&oacute;gica, as&iacute;  como en los pacientes con trastornos afectivos, estados de confusi&oacute;n o cefalea<sup>31,76</sup>.</p>      <p>Los pacientes con LES tienden a perder mayor volumen del cuerpo calloso cerebral y presentar dilataci&oacute;n periventricular en comparaci&oacute;n con personas sanas<sup>61,87</sup>. La atrofia cerebral es la anormalidad m&aacute;s com&uacute;n que se produce en el 8,7 al 32% de los pacientes, especialmente en aquellos con la enfermedad de mayor duraci&oacute;n, con historia de isquemia cerebral y d&eacute;ficit cognitivo<sup>88</sup>.</p>      <p>Como se mencion&oacute;,  los pacientes con LES tienen un mayor riesgo de presentar ACV en comparaci&oacute;n con la poblaci&oacute;n general. En la RNM se pueden observar m&uacute;ltiples infartos peque&ntilde;os de la sustancia gris cortical o profunda como m&uacute;ltiples lesiones hiperintensas en T2 y en las im&aacute;genes de FLAIR<sup>88</sup>. En la enfermedad de los vasos grandes, los infartos relacionados con uno o m&aacute;s territorios arteriales se pueden ver en la TAC o en la RNM.</p>      <p>La RNM ha demostrado ser m&aacute;s sensible para la detecci&oacute;n de anomal&iacute;as de la sustancia blanca, en particular con el FLAIR. Las alteraciones en la RNM han sido reportadas en el 54 al 81% de los pacientes con LESNP y en el 15 al 50% de los pacientes sin manifestaciones neuropsiqui&aacute;tricas<sup>44,89</sup>. Las secuencias T2 detectan edema y son, por lo tanto, m&aacute;s sensibles que las secuencias de T1 para la identificaci&oacute;n de anormalidades en pacientes con LESNP. En los pacientes con afectaci&oacute;n neurol&oacute;gica focal predominan las lesiones en la sustancia blanca periventricular y subcortical, por lo general en la distribuci&oacute;n de un vaso sangu&iacute;neo cerebral importante. Se han encontrado lesiones dentro de la sustancia blanca cerebral en hasta el 70% de los pacientes con LES, distribuidas de forma difusa en ambos hemisferios cerebrales<sup>90,91</sup>. Sin embargo, estas lesiones de sustancia blanca multifocales no son espec&iacute;ficas, por lo que tienen m&aacute;s probabilidades de ser atribuidas a hipertensi&oacute;n, a LES de larga data o a enfermedad de vasos peque&ntilde;os relacionada con la edad<sup>52</sup>.</p>      <p>Cuando la RNM convencional es normal o no proporciona una explicaci&oacute;n de los signos y s&iacute;ntomas, se pueden realizar neuroim&aacute;genes avanzadas. Modalidades que deben considerarse (seg&uacute;n la disponibilidad y la experiencia local) incluyen espectroscopia de resonancia magn&eacute;tica, im&aacute;genes de transferencia de magnetizaci&oacute;n, RNM cuantitativa o tomograf&iacute;a computarizada por emisi&oacute;n de fot&oacute;n &uacute;nico (SPECT) o tomograf&iacute;a por emisi&oacute;n de positrones (PET)<sup>52</sup>. Estos estudios de imagen pueden revelar alteraciones adicionales de sustancia blanca y gris, con modesta especificidad para LESNP. As&iacute;  mismo, pueden proporcionar informaci&oacute;n adicional sobre los trastornos metab&oacute;licos y funcionales en pacientes con LES con s&iacute;ntomas neurol&oacute;gicos<sup>6</sup>.</p>      <p>La espectroscopia de resonancia magn&eacute;tica se ha utilizado para monitorizar los cambios en ATP y fosfocreatina durante los episodios agudos de lupus CNS, y la RNM de prot&oacute;n se ha usado para estudiar los cambios anat&oacute;micos en los cerebros de los pacientes con LES con atrofia cerebral<sup>92</sup>.</p>      <p>La PET se basa en el uso de ox&iacute;geno radiomarcado para evaluar el metabolismo de las c&eacute;lulas del cerebro, radiomarcado CO<sub>2</sub> para evaluar el flujo sangu&iacute;neo vascular cerebral y glucosa marcada radiactivamente, lo que ha demostrado anormalidades en el metabolismo celular y el flujo sangu&iacute;neo regional en pacientes con LES<sup>93</sup>.</p>      ]]></body>
<body><![CDATA[<p><font size="3"><b>Tratamiento</b></font></p>      <p>El tratamiento de las manifestaciones neuropsiqui&aacute;tricas del lupus va m&aacute;s all&aacute;  del objetivo principal de este art&iacute;culo, de manera que se abordaron algunos principios generales. Lo primero y m&aacute;s importante a resaltar es que antes de iniciar cualquier tratamiento inmunosupresor/inmunomodulador se debe descartar cualquier tipo de infecci&oacute;n coexistente con la manifestaci&oacute;n l&uacute;pica, dada la alta probabilidad de empeorar el curso cl&iacute;nico de un proceso s&eacute;ptico. Como segunda medida, el uso de antiparasitarios previo al inicio de tratamiento inmunosupresor/inmunomodulador evitar&aacute;  principalmente la infecci&oacute;n diseminada por <i>Strongyloides stercoralis. </i>Una vez abordadas estas 2 consideraciones, se debe proceder al tratamiento espec&iacute;fico de cada complicaci&oacute;n<sup>43,52</sup>.</p>      <p>En la actualidad no existen tratamientos espec&iacute;ficos o una terapia estandarizada para el tratamiento del LESNP, debido a que no hay estudios que demuestren la eficacia y la seguridad de los mismos. Las manifestaciones neuropsiqui&aacute;tricas del LES son un reflejo de un proceso inflamatorio sist&eacute;mico que deriva en neurotoxicidad, de manera que el tratamiento inmunosupresor/inmunomodulador debe administrarse de manera sist&eacute;mica. El uso de uno u otro inmunosupresor depender&aacute;  de si el paciente se encuentra con altos &iacute;ndices de actividad o se encuentra en ajustes de terapia inmunomoduladora cr&oacute;nica. El SLEDAI<sup>94</sup> ha sido validado para la evaluaci&oacute;n de la actividad de la enfermedad<sup>95</sup>.</p>      <p>Aqu&iacute;  el compromiso del SNC es determinante, dado que puede inclinar la balanza hacia menores dosis de inmunosupresores o inicio de terapia combinada de inmunosupresores e inmunomoduladores. En casos de actividad severa se recomienda la hospitalizaci&oacute;n del paciente y el inicio de pulsos de esteroides endovenosos, con posterior cambio a terapia oral combinada con inmunomoduladores<sup>96</sup> o en combinaci&oacute;n con inmunosupresores (ciclofosfamida como inducci&oacute;n y posteriormente azatioprina micofenolato o metotrexato)<sup>97,98</sup>. En LESNP grave refractario a la terapia inmunosupresora est&aacute;ndar se incluyen, entre otros tratamientos, plasmaf&eacute;resis<sup>49 </sup>e inmunoglobulina intravenosa<sup>99</sup>, y rituximab (anticuerpo monoclonal anti-CD20)<sup>100</sup>.</p>      <p>La antiagregaci&oacute;n plaquetaria o de anticoagulaci&oacute;n se recomienda para LESNP relacionada con anticuerpos antifosfol&iacute;pidos, especialmente para las enfermedades cardiovasculares tromb&oacute;ticas, psicosis y d&eacute;ficit cognitivo severo<sup>101</sup>.</p>      <p>Se han desarrollado tratamientos experimentales con potencial uso en casos refractarios de LESNP, con efecto sobre procesos del sistema inmune como en la activaci&oacute;n de c&eacute;lulas T (anticuerpos monoclonales contra el ligando CD40L, CTLA-4, anticuerpos monoclonales anti-B7-1), producci&oacute;n de anticuerpos anti-ADN nativo, activaci&oacute;n y dep&oacute;sito de complemento: anticuerpo monoclonal contra C5, activaci&oacute;n y modulaci&oacute;n de citoquinas<sup>98</sup>.</p>      <p><font size="3"><b>Conclusiones</b></font></p>      <p>El compromiso neuropsiqui&aacute;trico ocurre en el 30-40% de los pacientes con LES y tiene importantes consecuencias pron&oacute;sticas, con gran impacto en la morbimortalidad, en la calidad de vida y en los costos en salud. Las principales dificultades en su diagn&oacute;stico incluyen determinar si la manifestaci&oacute;n se debe, principalmente, a la actividad del LES en el cerebro o es una consecuencia de alteraciones metab&oacute;licas, infecciones, enfermedades sist&eacute;micas o el uso de tratamientos inmunosupresores.</p>      <p>Requiere un diagn&oacute;stico temprano y tratamiento oportuno. El enfoque diagn&oacute;stico incluye estudios serol&oacute;gicos, de LCR y estudios de neuroim&aacute;genes, principalmente. El tratamiento se basa en la gravedad y en el tipo de manifestaci&oacute;n neuropsiqui&aacute;trica, e incluye esteroides, inmunomoduladores, anticoagulantes, terapia sintom&aacute;tica (anticonvulsivantes y antidepresivos).</p>      <p>Se requiere impulsar los esfuerzos para desarrollar herramientas de diagn&oacute;stico de enfermedad neuropsiqui&aacute;trica espec&iacute;fica asociada a LES para guiar decisiones terap&eacute;uticas eficaces.</p>      ]]></body>
<body><![CDATA[<p><b>Conflicto de intereses</b></p>      <p>Los autores declaran no tener ning&uacute;n conflicto de intereses.</p>      <p><font size="3"><b>Responsabilidades &eacute;ticas</b></font></p>      <p><b>Protecci&oacute;n de personas y animales. </b>Los autores declaran que para esta investigaci&oacute;n no se han realizado experimentos en seres humanos ni en animales.</p>      <p><b>Confidencialidad de los datos. </b>Los autores declaran que en este art&iacute;culo no aparecen datos de pacientes.</p>      <p><b>Derecho a la privacidad y consentimiento informado. </b>Los autores declaran que en este art&iacute;culo no aparecen datos de pacientes.</p> <hr>     <p><font size="3"><b>Bibliograf&iacute;a</b></font></p>      <!-- ref --><p>1. Liu Z, Davidson A. Taming lupus-a new understanding of pathogenesis is leading to clinical advances. 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