<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932010000100004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Meningitis recurrente en el adulto: un reto diagnóstico y terapéutico]]></article-title>
<article-title xml:lang="en"><![CDATA[Recurrent meningitis in the adult: a diagnostic and therapeutic challenge]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vagner Ramírez]]></surname>
<given-names><![CDATA[Basilio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaviria Barrera]]></surname>
<given-names><![CDATA[María Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zuluaga Quintero]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Pablo Tobón Uribe Jefe de la Sección de Neurología ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Pontificia Bolivariana Facultad de Medicina Semillero de Investigación]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2010</year>
</pub-date>
<volume>23</volume>
<numero>1</numero>
<fpage>34</fpage>
<lpage>42</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932010000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932010000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932010000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La meningitis recurrente no es una entidad común pero tiene el potencial de generar secuelas importantes a mediano y largo plazo. Su cuadro clínico depende del agente causal aunque en la mayoría de los pacientes se conserva al menos uno de los síntomas clásicos de la meningitis aguda (cefalea intensa, fiebre y rigidez de nuca). Debido a su variabilidad clínica se requieren un alto nivel de sospecha y usar bien las pruebas de laboratorio para llegar oportunamente al diagnóstico. El presente artículo contiene una revisión de la literatura sobre la epidemiología, la etiología, el cuadro clínico, el diagnóstico y el tratamiento de esta enfermedad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Recurrent meningitis is an uncommon condition with the capability of causing important midand long-term sequelae. Its clinical presentation depends on the etiologic agent, although most patients exhibit at least one of the classical symptoms of acute meningitis (intense headache, fever and neck stiffness). Due to the clinical variability of the disease, a high level of suspicion and an adequate use of laboratory tests are required in order to establish a timely diagnosis. This article contains a literature review regarding epidemiology, etiology, clinical presentation, diagnosis and management of recurrent meningitis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Meningitis recurrente]]></kwd>
<kwd lng="en"><![CDATA[Recurrent meningitis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align=right><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISTA</b></font></p>     <p>&nbsp;</p>     <p align=center><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>Meningitis recurrente en el adulto: un reto diagn&oacute;stico y terap&eacute;utico</b></font></p>     <p>&nbsp;</p>     <p align=center><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Recurrent meningitis in the adult: a diagnostic and therapeutic challenge</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Basilio Vagner Ram&iacute;rez<sup>1</sup>; Mar&iacute;a Elizabeth Gaviria Barrera<sup>2</sup>; M&oacute;nica Zuluaga Quintero<sup>2</sup></b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sup>1</sup> M&eacute;dico, Especialista en Neurolog&iacute;a cl&iacute;nica. Jefe de la Secci&oacute;n de Neurolog&iacute;a, Hospital Pablo Tob&oacute;n Uribe, Medell&iacute;n, Colombia. Docente asociado de Neurolog&iacute;a cl&iacute;nica, Facultad de Medicina, Universidad Pontificia Bolivariana y CES, Medell&iacute;n, Colombia.</font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sup>2</sup> Estudiante de Medicina. Miembro avanzado del Semillero de Investigaci&oacute;n de la Facultad de Medicina (SIFAM), Universidad Pontificia Bolivariana, Medell&iacute;n, Colombia. Correspondencia: Basilio Vagner Ramirez<a href="mailto:basilio_vagner@hotmail.com">  basilio_vagner@hotmail.com</a></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La meningitis recurrente no es una entidad com&uacute;n pero tiene el potencial de generar secuelas importantes a mediano y largo plazo. Su cuadro cl&iacute;nico depende del agente causal aunque en la mayor&iacute;a de los pacientes se conserva al menos uno de los s&iacute;ntomas cl&aacute;sicos de la meningitis   aguda (cefalea intensa, fiebre y rigidez de nuca). Debido a su variabilidad cl&iacute;nica se requieren un alto nivel de sospecha y usar bien las pruebas de laboratorio para llegar oportunamente al diagn&oacute;stico. El presente art&iacute;culo contiene una revisi&oacute;n de la literatura sobre la epidemiolog&iacute;a, la etiolog&iacute;a, el cuadro cl&iacute;nico, el diagn&oacute;stico y el tratamiento de esta enfermedad.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Palabra clave</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Meningitis recurrente</i></font></p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recurrent meningitis is an uncommon condition with the capability of causing important midand long-term sequelae. Its clinical presentation depends on the etiologic agent, although most patients exhibit at least one of the classical symptoms of acute meningitis (intense headache, fever and neck stiffness). Due to the clinical variability of the disease, a high level of suspicion and an adequate use of laboratory tests are required in order to establish a timely diagnosis. This article contains a literature review regarding epidemiology, etiology, clinical presentation, diagnosis and management of recurrent meningitis.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Key word</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Recurrent meningitis</i></font></p> <hr noshade size="1">     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODUCCI&Oacute;N</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La meningitis es una emergencia neurol&oacute;gica relativamente com&uacute;n (4 a 6 casos por 100.000 adultos, por a&ntilde;o, en Holanda y el norte de Europa),<sup>1,2</sup> que puede ser causada por bacterias u otros microorganismos, por agentes qu&iacute;micos o por procesos inflamatorios no infecciosos; se caracteriza por inflamaci&oacute;n de las meninges<sup>3</sup> que provoca fiebre, cefalea, rigidez de nuca, cambios en el l&iacute;quido cefalorraqu&iacute;deo (LCR), alteraciones de la conciencia, signos neurol&oacute;gicos focales y convulsiones.<sup>4-6</sup> La importancia de estudiarla radica en su relaci&oacute;n con secuelas neurol&oacute;gicas  permanentes<sup>7,8</sup> que incluyen disfunci&oacute;n cognitiva, d&eacute;ficit sensorial, sensitivo y motor, alteraci&oacute;n del estado de conciencia, coma y, en el 33&#37;<sup>9</sup> de los casos, la muerte cuando no se hacen tempranamente la identificaci&oacute;n y el tratamiento.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Aunque es infrecuente, la reaparici&oacute;n de los signos y s&iacute;ntomas de meningitis despu&eacute;s de la esterilizaci&oacute;n del LCR puede ocurrir durante el tratamiento o despu&eacute;s de terminarlo. Se habla de <i>reactivaci&oacute;n</i> cuando la meningitis reaparece mientras el paciente est&aacute; siendo tratado; y se define como <i>recurrencia</i> si reaparece en las 3&#8211;4 semanas siguientes al tratamiento o si ocurre un segundo episodio debido a un microorganismo diferente luego de una remisi&oacute;n completa.<sup>2,10</sup></font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En este art&iacute;culo se presenta una revisi&oacute;n de los aspectos m&aacute;s importantes de la meningitis recurrente (MR) con el fin de ampliar y mejorar el conocimiento acerca de la misma por parte de los profesionales de la salud.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se calcula que la meningitis recurrente se presenta en 4&#8211;9&#37;<sup>2,10</sup> del total de pacientes con un episodio previo de meningitis; se la ha asociado a traumas de cr&aacute;neo, procedimientos neuroquir&uacute;rgicos,<sup>10</sup> malformaciones cong&eacute;nitas<sup>11,12</sup> o estados de inmunosupresi&oacute;n.<sup>13,14</sup></font></p>       <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El cl&iacute;nico debe pensar en cinco categor&iacute;as de enfermedades que son responsables de la mayor parte de los casos de MR: infecciones men&iacute;ngeas,<sup>2,15</sup> c&aacute;ncer,<sup>16</sup> trastornos inflamatorios cr&oacute;nicos,<sup>17</sup> meningitis qu&iacute;micas<sup>15,18</sup> e infecciones paramen&iacute;ngeas.<sup>15</sup></font></p>     <p>&nbsp;</p>      <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>PATOG&Eacute;NESIS</b></font></p>      ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Al igual que en la meningitis aguda, un paso fundamental en la patog&eacute;nesis de la MR es la reacci&oacute;n inflamatoria producida como respuesta al agenteagresor (bacterias, virus, hongos, par&aacute;sitos, sustancias t&oacute;xicas, entre otros).<sup>4,19</sup> Los niveles elevados de citoquinas, quimioquinas, TNF&#8211;&alpha; e IL1 en el LCR odifican su composici&oacute;n, aumentan la permeabilidad de la barrera hematoencef&aacute;lica y alteran el flujo sangu&iacute;neo cerebral,<sup>15,20</sup> con producci&oacute;n de amino&aacute;cidos excitadores y especies reactivas de ox&iacute;geno y nitr&oacute;geno, todo lo cual, en conjunto, causa las diferentes manifestaciones y complicaciones de la MR.<sup>1,19</sup></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ETIOLOG&Iacute;A</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La etiolog&iacute;a de la MR es muy variada y se encuentra agrupada en categor&iacute;as de acuerdo con las caracter&iacute;sticas del agente agresor (infecciosos o no infecciosos; ejemplos de estos &uacute;ltimos son los casos debidos a sustancias qu&iacute;micas y los inflamatorios).<sup>21,22</sup> Es de suma importancia para el diagn&oacute;stico tener en cuenta los antecedentes epidemiol&oacute;gicos del paciente como gu&iacute;a en el momento de seleccionar las pruebas de laboratorio.<sup>4</sup> A pesar de un estudio exhaustivo, aproximadamente en un tercio de los casos de MR no se identifica la causa, situaci&oacute;n denominada caso enigm&aacute;tico, que puede ser debida a que muchos microorganismos como el <i>Mycobacterium tuberculosis</i> necesitan semanas para crecer y ser identificados en los cultivos;<sup>23</sup> en los pacientes con MR el tiempo es valioso a la hora de instaurar un tratamiento, pues el deterioro neurol&oacute;gico es r&aacute;pido y, hasta en 78,5&#37; de los casos, irreversible.<sup>24</sup> Al respecto, diversos autores han hallado en pacientes con MR los siguientes trastornos y sus respectivas tasas de prevalencia: alg&uacute;n grado de disfunci&oacute;n cognitiva (55&#37;), hipoacusia (40&#37;), d&eacute;ficit motor (40&#37;), atrofia del nervio &oacute;ptico (37&#37;) y par&aacute;lisis de pares craneales (23&#37;).<sup>23, 25</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En el presente estudio se revisaron los agentes etiol&oacute;gicos m&aacute;s comunes de acuerdo con las categor&iacute;as ya mencionadas, adem&aacute;s de los factores de riesgo para cada una.</font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La causa m&aacute;s frecuente de MR de origen infeccioso es la bacteriana, principalmente por los siguientes microorganismos:</font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Streptococcus pneumoniae</i>, responsable del 82,3&#37; de los casos<sup>2</sup> como fue informado en un estudio de cohorte llevado a cabo en Holanda; el principal factor de riesgo fue la neumon&iacute;a por dicho germen.<sup>26</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Neisseria meningitidis:</i> puede ser el agente etiol&oacute;gico hasta en el 12,5&#37; de los casos de MR; tambi&eacute;n es responsable del 18&#37; de las meningitis adquiridas en la comunidad;<sup>26</sup> por lo tanto, es fundamental la inspecci&oacute;n cuidadosa en busca de petequias o lesiones purp&uacute;ricas en la piel que son un signo de esta infecci&oacute;n.<sup>27,28</sup> Este germen se adquiere por colonizaci&oacute;n nasofar&iacute;ngea y el riesgo de invasi&oacute;n depende de la virulencia de la cepa y de la capacidad de respuesta inmunol&oacute;gica del hu&eacute;sped.<sup>28</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Listeria monocytogenes</i>: est&aacute; implicada en las meningitis en pacientes inmunocomprometidos,<sup>29</sup> en las edades extremas de la vida<sup>4,29</sup> y en mujeres embarazadas;<sup>30</sup> la infecci&oacute;n se produce por ingesti&oacute;n de alimentos contaminados, por lo que el interrogatorio al respecto juega un papel importante.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Cocos grampositivos:</i> los estreptococos del grupo B, al igual que <i>la Listeria</i>, afectan a neonatos y a mayores de 50 a&ntilde;os, mientras que el <i>Staphylococcus aureus</i> y los estafilococos coagulasa negativa se relacionan con meningitis despu&eacute;s de neurocirug&iacute;as o quimioterapias intratecales.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Haemophilus influenzae b:</i> por la disponibilidad de la vacuna ha disminuido su frecuencia, pero a&uacute;n existe el riesgo en ni&ntilde;os no vacunados.<sup>31</sup></font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Un factor de riesgo com&uacute;n para la MR por los microorganismos mencionados es el antecedente de haber tenido una meningitis bacteriana parcial o totalmente tratada. (Tabla n.&ordm; 1).</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Mycobacterium tuberculosis:</i> se debe sospechar una MR por este microorganismo seg&uacute;n el contexto social del paciente, los antecedentes de exposici&oacute;n y de enfermedad tuberculosa previa, la historia de inmunosupresi&oacute;n o de sudoraci&oacute;n nocturna.<sup>32</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Treponema pallidum:</i> en cuanto a la MR debida a s&iacute;filis, se debe interrogar sobre las pr&aacute;cticas sexuales y las lesiones genitales o cut&aacute;neas en general; asimismo, averiguar si hay antecedentes de demencia o de infartos cerebrales debidos a endarteritis. La MR sifil&iacute;tica ocurre durante las etapas secundaria y terciaria de la enfermedad.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Borrelia burgdorferi:</i> si hay antecedentes de picaduras o de exposici&oacute;n a garrapatas o de eritemas migratorios cr&oacute;nicos, el cl&iacute;nico debe pensar en la enfermedad de Lyme que se debe a la infecci&oacute;n por <i>Borrelia burgdorferi</i>, o en el s&iacute;ndrome de Bannwarth (meningorradiculitis linfoc&iacute;tica) probablemente causado por este mismo microorganismo.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Cryptococcus neoformans, Histoplasma capsulatum, Aspergillus sp y C&aacute;ndida sp:</i> para orientar los estudios hacia la b&uacute;squeda de infecciones por estos hongos se debe interrogar sobre la historia de exposici&oacute;n laboral, los viajes a &aacute;reas end&eacute;micas, los estados de inmunosupresi&oacute;n y la terapia intravenosa prolongada(infecci&oacute;n por cat&eacute;ter); ante la sospecha de estas micosis se ordenan los correspondientes estudios del LCR. (Ver <a href="#t1">tabla 1</a>).<sup>4</sup></font></p>     <p align=center><font size="2"face="Verdana, Arial, Helvetica, sans-serif"><a name="t1"></a><img src=/img/revistas/iat/v23n1/v23n1a04t1.JPG></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En cuanto a los protozoarios como etiolog&iacute;a de la MR, cabe pensar en dos enfermedades por su frecuencia e importancia: la toxoplasmosis <i>(Toxoplasma gondii)</i> que se debe sospechar si existen abscesos cerebrales y estados de inmunosupresi&oacute;n y la tripanosomiasis (<i>Trypanosoma cruzi</i> en Am&eacute;rica y <i>T. brucei</i> en &Aacute;frica) si el paciente ha estado en zonas end&eacute;micas.<sup>33</sup></font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La neurocisticercosis, debida a infecci&oacute;n por la forma larvaria del helminto intestinal <i>Taenia solium</i>, se sospecha si hay hallazgos tales como cefalea cr&oacute;nica o crisis convulsivas, con signos neurol&oacute;gicos focales o sin ellos, acompa&ntilde;ados de hallazgos imaginol&oacute;gicos que incluyen hidrocefalia asociada a quistes men&iacute;ngeos con calcificaciones musculares o sin ellas.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Si el estudio seriado del LCR permanece negativo y el paciente sigue sintom&aacute;tico o con d&eacute;ficit neurol&oacute;gico, se lo debe interrogar y examinar nuevamente profundizando en aspectos como la presencia de adenopat&iacute;as, erupciones cut&aacute;neas y &uacute;lceras genitales, y continuar el estudio por medio de pruebas serol&oacute;gicas y moleculares para los diferentes virus relacionados con MR.<sup>34</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Como se mencion&oacute; anteriormente, las manifestaciones y consecuencias de la MR no son por el da&ntilde;o tisular causado por un microorganismo, sino por la intensa reacci&oacute;n inflamatoria de las meninges. Esta inflamaci&oacute;n tambi&eacute;n se puede deber a tumores primarios o metast&aacute;sicos, hipersensibilidad a medicamentos y enfermedades autoinmunes como la de Beh&ccedil;et, vasculitis y lupus eritematoso sist&eacute;mico.<sup>17,18</sup> Lo anterior indicaque si un paciente regresa a la instituci&oacute;n con s&iacute;ntomas men&iacute;ngeos sugestivos de MR se lo debe estudiar y ratar interdisciplinariamente para hacer el diagn&oacute;stico y, sobre todo, aplicar oportunamente un tratamiento adecuado de forma que se prevengan las secuelas.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>MANIFESTACIONES CL&Iacute;NICAS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El cuadro cl&iacute;nico de esta enfermedad var&iacute;a de acuerdo con la localizaci&oacute;n anat&oacute;mica de la inflamaci&oacute;n; cursa principalmente con cefalea persistente, con o sin rigidez de nuca, hidrocefalia, neuropat&iacute;as craneales, radiculopat&iacute;as y alteraciones cognitivas; estas manifestaciones se pueden producir aislada o simult&aacute;neamente.<sup>2,4,10,19,22</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Otros s&iacute;ntomas que se encuentran en los pacientes con MR son: dolor en el cuello o en la espalda, debilidad facial, diplop&iacute;a, disminuci&oacute;n de la agudeza visual o amaurosis, hipoacusia, paresia o plej&iacute;a en los brazos y piernas, disfunci&oacute;n de esf&iacute;nteres y torpeza de los movimientos.<sup>2,4</sup> Pueden o no estar presentes los signos de Brudzinski y Kernig, par&aacute;lisis de los pares craneales III, IV, VI y VII, papiledema, atrofia &oacute;ptica, mielopat&iacute;as y radiculopat&iacute;as.<sup>4</sup> Las manifestaciones neurop&aacute;ticas se deben a los dep&oacute;sitos inflamatorios generados en el LCR, que se ubican alrededor del tallo cerebral, de los pares craneales y de los l&oacute;bulos temporal y frontal.</font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Como consecuencias del da&ntilde;o vascular se pueden presentar alteraciones cognitivas como desorientaci&oacute;n, d&eacute;ficit de atenci&oacute;n y de memoria, perseverancia y signos de frontalizaci&oacute;n, as&iacute; como convulsiones, ictus y mielopat&iacute;as.<sup>35</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En los pacientes con evidencia de enfermedad diseminada, es &uacute;til para el cl&iacute;nico basarse en otros hallazgos, no espec&iacute;ficos, pero que se relacionan con el diagn&oacute;stico de MR.<sup>1</sup> Por ello, antes de someter al paciente a una serie de estudios diagn&oacute;sticos prolongados, costosos e innecesarios, es importante hacer una buena historia cl&iacute;nica que incluya los antecedentes de viajes, las pr&aacute;cticas sexuales y la exposici&oacute;n a agentes infecciosos.<sup>2</sup> Uno de los signos encontrados en el examen f&iacute;sico que orienta hacia una MR de origen infeccioso es la fiebre, aunque puede estar ausente en los pacientes inmunocomprometidos (VIH).<sup>4</sup> Por otra parte, la MR puede ser la primera manifestaci&oacute;n de un trastorno inflamatorio no infeccioso o de un proceso neopl&aacute;sico sin estar acompa&ntilde;ada de los signos de la enfermedad de base.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>DIAGN&Oacute;STICO</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El cuadro cl&iacute;nico y los resultados de las pruebas de laboratorio y de los estudios imaginol&oacute;gicos son las bases para hacer el diagn&oacute;stico de MR.<sup>36</sup> El an&aacute;lisis del LCR es el primer examen de laboratorio que permite identificar signos de inflamaci&oacute;n men&iacute;ngea.<sup>37,38</sup> El recuento celular con estudio diferencial y los niveles de glucosa y prote&iacute;nas orientan el diagn&oacute;stico hacia una u otra etiolog&iacute;a: <sup>39</sup> si se encuentra leucocitosis con predominio de polimorfonucleares neutr&oacute;filos, cabe pensar en una infecci&oacute;n bacteriana o un proceso inflamatorio; si hay aumento de eosin&oacute;filos, se deben plantear las causas parasitarias; cuando el predominio es de linfocitos se procede a investigar tres posibles causas: tuberculosis, meningitis viral o un cuadro neopl&aacute;sico.<sup>4,39</sup> Mediante estudios complementarios se puede definir la causa espec&iacute;fica de acuerdo con los posibles agentes agresores sospechados. (<a href="#t1">Tabla 1</a>). La tinci&oacute;n de Gram y el cultivo del LCR son fundamentales ante la sospecha de una etiolog&iacute;a bacteriana; la tinci&oacute;n de Ziehl Neelsen positiva apoya el diagn&oacute;stico de tuberculosis men&iacute;ngea y el cultivo positivo lo confirma.<sup>40,41</sup> Si el diagn&oacute;stico presuntivo es el de s&iacute;filis, se hace el VDRL en LCR, que no da resultados falsos positivos. Ante la sospecha de causas infecciosas no bacterianas se recurre a las tinciones y cultivos en LCR, biopsias men&iacute;ngeas y pruebas para detectar ant&iacute;genos y anticuerpos en suero y LCR.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los reactantes de fase aguda como la Prote&iacute;na C reactiva suelen estar elevados en pacientes con muchas de las causas infecciosas,<sup>42</sup> mas no excluyen una etiolog&iacute;a inflamatoria no infecciosa.<sup>43</sup> El hallazgo de autoanticuerpos, la biopsia men&iacute;ngea, los antecedentes del individuo y la correlaci&oacute;n cl&iacute;nica orientan hacia el diagn&oacute;stico de una MR de causa inflamatoria, secundaria a una enfermedad cr&oacute;nica autoinmune. La reacci&oacute;n en cadena de la polimerasa (PCR) es &uacute;til para llegar a un diagn&oacute;stico certero, como lo han demostrado Desai y Pal para el caso de la meningitis tuberculosa y Dierssen y colaboradores para la detecci&oacute;n r&aacute;pida de ARN de enterovirus en el LCR.<sup>41,44</sup> En el caso de la tuberculosis men&iacute;ngea la PCR permite hacer una identificaci&oacute;n espec&iacute;fica y temprana de la infecci&oacute;n en pacientes con actividad tuberculosa extraneural; su sensibilidad es del 48&#37; y su especificidad, del 100&#37;. Sin embargo, el est&aacute;ndar de oro sigue siendo el cultivo que en medios l&iacute;quidos como el BACTEC es tan sensible como la PCR y que tiene la ventaja adicional de que permite hacer pruebas de sensibilidad si se obtiene crecimiento.<sup>40,45,46</sup> La PCR se considera un m&eacute;todo r&aacute;pido, sensible y relativamente simple para diagnosticar no solomeningitis tuberculosa sino tambi&eacute;n la encefalitis por el virus Herpes simplex y la toxoplasmosis cerebral.<sup>47,48</sup> Los estudios imaginol&oacute;gicos tambi&eacute;n son clave, m&aacute;s a&uacute;n cuando se sospecha la existencia de hipertensi&oacute; endocraneana, en cuyo caso puede estar contraindicada la punci&oacute;n lumbar por el riesgo de herniaci&oacute;n.<sup>49</sup> La tomograf&iacute;a computarizada y laresonancia magn&eacute;tica nuclear contrastadas permiten detectar cambios como los siguientes: realce men&iacute;ngeo, infecciones paramen&iacute;ngeas incluidos los abscesos cerebrales, realce de la m&eacute;dula espinal en procesos neopl&aacute;sicos, inflamatorios o infecciosos; lesiones granulomatosas como las de tuberculosis, neurocisticercosis, sarcoidosis, granulomatosis de Wegener y enfermedades malignas.<sup>50</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Adem&aacute;s de observar la lesi&oacute;n, la imaginolog&iacute;a es un  apoyo para que el cl&iacute;nico defina si es oportuna la toma de una biopsia men&iacute;ngea o la punci&oacute;n lumbar.<sup>2,4</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La angiograf&iacute;a cerebral est&aacute; indicada para investigar la posibilidad de arteritis como en la vasculitis granulomatosa y en enfermedades inflamatorias o infecciosas.<sup>1,4</sup></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>TRATAMIENTO</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">No es f&aacute;cil la identificaci&oacute;n de los microorganismos causantes de MR porque su crecimiento en los cultivos puede tardar semanas e incluso ser negativo en 33&#37; de los casos. Cuando existe deterioro neurol&oacute;gico progresivo, aun sin haber detectado un agente causal espec&iacute;fico, est&aacute; indicado instaurar un tratamiento emp&iacute;rico que incluya antibi&oacute;ticos, anfotericina B y glucocorticoides, con lo cual se cubren infecciones bacterianas y mic&oacute;ticas y causas inflamatorias no infecciosas, respectivamente. Ello con el fin de evitar la progresi&oacute;n, el deterioro y las posibles secuelas. En los casos bacterianos, para poder hacer un tratamiento dirigido se debe identificar el germen causal, en lo posible hasta el nivel de especie, y estudiar su patr&oacute;n de sensibilidad a los antibi&oacute;ticos (<a href="#t2">tabla 2</a>).</font></p>     <p align=center><font size="2"face="Verdana, Arial, Helvetica, sans-serif"><a name="t2"></a><img src=/img/revistas/iat/v23n1/v23n1a04t2.JPG></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En presencia de una meningitis linfoc&iacute;tica es  importante pensar en tuberculosis sobre todo si en el LCR est&aacute;n disminuida la glucosa y elevadas las prote&iacute;nas. Para el tratamiento de la meningitis tuberculosa se prescribe un r&eacute;gimen que incluya isoniazida, rifampicina, pirazinamida y etambutol por ocho semanas, y se contin&uacute;an las dos primeras por 6 a 12 meses;<sup>51,52</sup> Entre los diagn&oacute;sticos diferenciales se deben tener presentes los procesos neopl&aacute;sicos para los cuales se puede aplicar radioterapia o quimioterapia de acuerdo con las caracter&iacute;sticas de la lesi&oacute;n y el estado cl&iacute;nico del paciente.<sup>53, 55</sup> En la meningitis debida al virus Herpes simplex, el tratamiento se hace con aciclovir, valaciclovir o famciclovir. La enfermedad causada por enterovirus, adenovirus y otros virus se resuelve espont&aacute;neamente,   pero los pacientes se benefician de un tratamiento sintom&aacute;tico que incluya hidrataci&oacute;n endovenosa con l&iacute;quidos que contengan glucosa y electr&oacute;litos, y antiem&eacute;ticos si hay n&aacute;useas y v&oacute;mito.<sup>56,57</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Existe evidencia de respuesta a glucocorticoides como la dexametasona en pacientes con enfermedades inflamatorias no infecciosas como las reumatol&oacute;gicas responsables de MR.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUSIONES</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La meningitis recurrente es una enfermedad infrecuente pero que le plantea al cl&iacute;nico un verdadero reto, no solo porque se requiere un alto nivel de sospecha sino porque se relaciona con una incidencia altade secuelas neurol&oacute;gicas a largo plazo. Su etiolog&iacute;a infecciosa es pr&aacute;cticamente igual a la de la meningitis   adquirida en la comunidad, pero deben tenerse en cuenta causas no infecciosas como las inflamatorias y las qu&iacute;micas. Para su correcto tratamiento es importante identificar prontamente al mecanismo causal, de modo que se pueda hacer un enfoque terap&eacute;utico espec&iacute;fico.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>REFERENCIAS BIBLIOGR&Aacute;FICAS</b></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1. Van de Beek D, de Gans J, Tunkel AR, Wijdicks EF. Community&#8211;acquired bacterial meningitis in adults. N Engl J Med 2006; 354: 45&#8211;53.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000079&pid=S0121-0793201000010000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">2. Adriani KS, Van de Beek D, Brouwer MC, Spanjaard L, de Gans T. 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