<?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>0212-7199</journal-id>
<journal-title><![CDATA[Anales de Medicina Interna]]></journal-title>
<abbrev-journal-title><![CDATA[An. Med. Interna (Madrid)]]></abbrev-journal-title>
<issn>0212-7199</issn>
<publisher>
<publisher-name><![CDATA[Arán Ediciones, S. L.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-71992004000500010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Manejo práctico de una eosinofilia]]></article-title>
<article-title xml:lang="en"><![CDATA[Eosinophilia: a practical approach]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Arellano]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pardo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Cabrera]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carranza]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángel-Moreno]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario Insular de Las Palmas Servicio de Medicina Interna Unidad de Enfermedades Infecciosas y Medicina Tropical]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Las Palmas de Gran Canaria Departamento de Ciencias Médicas y Quirúrgicas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Salamanca Facultad de Farmacia Laboratorio de Parasitología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2004</year>
</pub-date>
<volume>21</volume>
<numero>5</numero>
<fpage>44</fpage>
<lpage>52</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-71992004000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-71992004000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-71992004000500010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En esta revision se define inicialmente el concepto y grado de eosinofilia. En un segundo apartado se estudian las causas principales de esta alteración hematológica considerando tres tipos de pacientes: a) autóctonos no infectado por VIH; b) infectados por VIH; y c) procedentes de regiones tropicales (eosinofilia importada). En tercer lugar, se desarrolla un protocolo diagnóstico secuencial, indicando las pruebas mas útiles para llegar al diagnóstico en los grupos mencionados previamente. Específicamente, se incluyen las pruebas complementarias útiles en los pacientes con eosinofilia importada, tanto en presencia como en ausencia de datos de focalidad. Tras una breve referencia a las consecuencias patológicas de la eosinofilia, se contemplan las mediadas terapéuticas útiles en estos pacientes. En este ultimo apartado se hace un especial énfasis en el tratamiento antihelmíntico y en el manejo del síndrome hipereosinofílico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this first part of this paper we review the definition of eosinophilia and their classification according to the degree of elevation of eosinophils/&micro;L. Aetiological factors related with eosinophilia were described in three groups of patients: a) autochthonous non-infected by HIV; b) HIV-infected; and c) arrived from tropical countries (imported eosinophilia). We included an algorithmic approach to the diagnosis, including the diagnostic studies that should be performed in patients with or without organ involvement. Pathological consequences of eosinophilia are indicated in the next part of the paper. Finally, therapeutical options used in patients with eosinophilia are reviewed, with an special emphasis on antihelminthic therapies and the management of the hypereosinophilic syndromes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Eosinofilia]]></kwd>
<kwd lng="es"><![CDATA[Enfermedades importadas]]></kwd>
<kwd lng="es"><![CDATA[Helmintos]]></kwd>
<kwd lng="es"><![CDATA[Diagnóstico]]></kwd>
<kwd lng="es"><![CDATA[Tratamiento]]></kwd>
<kwd lng="en"><![CDATA[Eosinophilia]]></kwd>
<kwd lng="en"><![CDATA[Imported diseases]]></kwd>
<kwd lng="en"><![CDATA[Helminths]]></kwd>
<kwd lng="en"><![CDATA[Diagnosis]]></kwd>
<kwd lng="en"><![CDATA[Treatment]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <table border="0" width="100%">   <tr>     <td width="15%" valign="top"></td>     <td width="85%" valign="top">     <p><b><font size=5>Manejo pr&aacute;ctico de una eosinofilia</font></b></p>     <p>J. L. PÉREZ-ARELLANO<sup>1,2</sup>, J. PARDO<sup>3</sup>, M. HERNÁNDEZ-CABRERA<sup>1</sup>,    <br> C. CARRANZA<sup>2,3</sup>, A. ÁNGEL-MORENO<sup>1,2</sup>, A. MURO<sup>3</sup></p>     <p><i><sup>1</sup>Unidad de Enfermedades Infecciosas y Medicina Tropical. Servicio de Medicina Interna.    <br> Hospital Universitario Insular de Las Palmas. <sup>2</sup>Departamento de Ciencias M&eacute;dicas y    <br> Quir&uacute;rgicas. <sup>3</sup>Laboratorio de Parasitolog&iacute;a. Facultad de Farmacia. Universidad de Salamanca</i></p>     <p>&nbsp;</p>     </td>   </tr> </table> <table border="0" width="100%">   <tr>     <td width="48%" valign="top"></td>     <td width="4%" valign="top"></td>     <td width="48%" valign="top"><font size="2"><i>EOSINOPHILIA: A PRACTICAL       APPROACH</i></font>           <p>&nbsp;</td>   </tr>   <tr>     <td width="48%" valign="top">     <p>RESUMEN</p>     ]]></body>
<body><![CDATA[<p>En esta revision se define inicialmente el concepto y grado de eosinofilia. En un segundo apartado se estudian las causas principales de esta alteraci&oacute;n hematol&oacute;gica considerando tres tipos de pacientes: a) aut&oacute;ctonos no infectado por VIH; b) infectados por VIH; y c) procedentes de regiones tropicales (eosinofilia importada). En tercer lugar, se desarrolla un protocolo diagn&oacute;stico secuencial, indicando las pruebas mas &uacute;tiles para llegar al diagn&oacute;stico en los grupos mencionados previamente. Espec&iacute;ficamente, se incluyen las pruebas complementarias &uacute;tiles en los pacientes con eosinofilia importada, tanto en presencia como en ausencia de datos de focalidad. Tras una breve referencia a las consecuencias patol&oacute;gicas de la eosinofilia, se contemplan las mediadas terap&eacute;uticas &uacute;tiles en estos pacientes. En este ultimo apartado se hace un especial &eacute;nfasis en el tratamiento antihelm&iacute;ntico y en el manejo del s&iacute;ndrome hipereosinof&iacute;lico.</p>     <p>PALABRAS CLAVE: Eosinofilia. Enfermedades importadas. Helmintos. Diagn&oacute;stico. Tratamiento.</p> </td>  <td width="4%" valign="top"></td> <td width="48%" valign="top">     <p>ABSTRACT</p>     <p><i>In this first part of this paper we review the definition of eosinophilia and their classification according to the degree of elevation of eosinophils/&micro;L. Aetiological factors related with eosinophilia were described in three groups of patients: a) autochthonous non-infected by HIV; b) HIV-infected; and c) arrived from tropical countries (imported eosinophilia). We included an algorithmic approach to the diagnosis, including the diagnostic studies that should be performed in patients with or without organ involvement. Pathological consequences of eosinophilia are indicated in the next part of the paper. Finally, therapeutical options used in patients with eosinophilia are reviewed, with an special emphasis on antihelminthic therapies and the management of the hypereosinophilic syndromes.</i></p>     <p>KEY WORDS: <i>Eosinophilia. Imported diseases. Helminths. Diagnosis. Treatment.</i></p>     <p>&nbsp;</td> </tr> </table>     <p><i>Pérez-Arellano JL, Pardo J, Hern&aacute;ndez-Cabrera M, Carranza C, Ángel-Moreno A, Muro A. Manejo práctico de una eosinofilia. An Med Interna (Madrid) 2004; 21: 244-252.</i></p> <hr width="30%" align="left">     <p><font size="2"><i>Trabajo aceptado</i>: 8 de enero de 2004</font></p>     <p><font size="2"><i>Correspondencia</i>: José Luis Pérez Arellano. Departamento de Ciencias Médicas y Quirúrgicas. Universidad de Las Palmas de Gran Canaria. Centro de Ciencias de la Salud. Plaza Dr. Pasteur, s/n. 35080 Las Palmas de Gran Canaria. e-mail: <a href="mailto:jlperez@dcmq.ulpgc.es">jlperez@dcmq.ulpgc.es</a></font></p> <hr>     <p>INTRODUCCIÓN</p>     ]]></body>
<body><![CDATA[<p>La eosinofilia es un dato que aparece de forma relativamente frecuente en   la pr&aacute;ctica cl&iacute;nica. Su importancia radica en dos aspectos principales:   diagn&oacute;sticos y patog&eacute;nicos. As&iacute;, desde un punto de vista   diagn&oacute;stico, la detecci&oacute;n de eosinofilia sugiere la presencia   de diversas entidades. Por otro lado, en algunas circunstancias, la liberaci&oacute;n   de productos de estos leucocitos se asocia a lesiones tisulares.</p>     <p>Aunque los mecanismos fisiopatol&oacute;gicos por los que aparece eosinofilia   son de gran inter&eacute;s (1), en esta revisi&oacute;n no ser&aacute;n contemplados   de forma detallada debido a razones de espacio. Inicialmente se revisar&aacute; el   concepto de eosinofilia, indicando sus limitaciones y nomenclatura. En un segundo   apartado se consideran, de forma detallada, las principales causas de eosinofilia   agrupadas desde un punto de vista pr&aacute;ctico. El siguiente ep&iacute;grafe   revisa las consecuencias patol&oacute;gicas de la eosinofilia tanto como dato "de   alarma" como debidas directamente a la liberaci&oacute;n de sustancias.   Finalmente se consideran los principales aspectos terap&eacute;uticos, haciendo   especial &eacute;nfasis en el manejo de los antihelm&iacute;nticos y en el   tratamiento de la eosinofilia idiop&aacute;tica.</p>     <p>CONCEPTO Y LÍMITES</p>     <p>Se considera que existe eosinofilia cuando el n&uacute;mero total de eosin&oacute;filos   circulantes en sangre perif&eacute;rica es significativamente superior al presente   en la poblaci&oacute;n normal. Los valores descritos por diferentes autores   son muy variables oscilando entre 350 y 700/&micro;L. As&iacute;, Rothemberg   considera como l&iacute;mite para definir esta situaci&oacute;n el de 350 eosin&oacute;filos/&micro;L   (1), mientras que Bridgen considera que existe eosinofilia a partir de 700   /&micro;L (2). De cualquier forma, la mayor parte de autores consideran que   existe eosinofilia cuando el n&uacute;mero de eosin&oacute;filos es igual o   mayor a 450/&micro;L (3, 4).</p>     <p>Sin embargo, este valor num&eacute;rico debe ser matizado en relaci&oacute;n   con los datos cl&iacute;nicos, ya que algunos f&aacute;rmacos o diferentes   situaciones (tanto fisiol&oacute;gicas como patol&oacute;gicas) pueden modificar   esta magnitud. Entre los factores fisiol&oacute;gicos que influyen en el n&uacute;mero   de eosin&oacute;filos circulantes se encuentran los siguientes: la hora del   d&iacute;a en la que se realice la extracci&oacute;n de la muestra, la edad,   el sexo, y el embarazo. A modo de ejemplo, la variaci&oacute;n diurna del n&uacute;mero   de eosin&oacute;filos puede ser de hasta un 40%, mayor por la noche que por   la ma&ntilde;ana, en relaci&oacute;n con el ritmo circadiano de corticoides.   Tambi&eacute;n influye en esta magnitud el empleo de f&aacute;rmacos (p. ej.   adrenalina, &szlig;-bloqueantes o corticoides) que puede modificar de forma   notable el n&uacute;mero de eosin&oacute;filos (hasta en un 30%). Finalmente,   la presencia de infecciones agudas (principalmente v&iacute;ricas, bacterianas   o protozoarias, especialmente la malaria) puede disminuir transitoriamente   el n&uacute;mero de eosin&oacute;filos circulantes, reapareciendo los valores   basales una vez resuelto el problema infeccioso que ocasion&oacute; este descenso.   Es importante insistir en que una infecci&oacute;n no helm&iacute;ntica puede   llevar, de forma transitoria, a &ldquo;normalizar&rdquo; valores de eosin&oacute;filos   muy elevados. Esta circunstancia puede observarse, en la pr&aacute;ctica, en   situaciones de patolog&iacute;a importada (espec&iacute;ficamente en el paciente   con malaria) en las que, una vez resuelta la infecci&oacute;n protozoaria,   se detecta eosinofilia.</p>     <p>Aunque no ha sido estudiado adecuadamente, el aumento del tanto por ciento   de eosin&oacute;filos sin aumento del n&uacute;mero total, no debe ser considerado   de forma pr&aacute;ctica una eosinofilia.</p>     <p>GRADOS DE EOSINOFILIA</p>     <p>En la pr&aacute;ctica cl&iacute;nica, se acepta que el n&uacute;mero total   de eosin&oacute;filos tiene valor en la orientaci&oacute;n diagn&oacute;stica,   de tal forma que a medida que el n&uacute;mero de eosin&oacute;filos es mayor,   disminuyen las posibilidades diagn&oacute;sticas. Sin embargo, no existen trabajos   rigurosos en los que se relacione el grado de eosinofilia con los determinados   agentes etiol&oacute;gicos.</p>     <p>De cualquier forma, la mayor parte de los autores emplea como puntos de corte   los valores de 1000 y 3000/&micro;L para definir 3 grados de eosinofilia. As&iacute;,   se considerar&iacute;a eosinofilia leve entre 450 y 999 eosin&oacute;filos/&micro;L;   eosinofilia moderada entre 1000 y 2999 eosin&oacute;filos/&micro;L y eosinofilia   intensa cuando las cifras de eosin&oacute;filos superen los 3000/&micro;L (4).</p>     <p>SIGNIFICADO CLÍNICO DE UNA EOSINOFILIA</p>     ]]></body>
<body><![CDATA[<p>Una regla pr&aacute;ctica indica que la detecci&oacute;n de eosinofilia en   una persona que proceda o haya viajado a una regi&oacute;n tropical debe hacer   pensar en primer lugar en causas infecciosas, mientras que en una persona que   no haya presentado este dato epidemiol&oacute;gico deben descartarse otro tipo   de causas (inmunol&oacute;gicas, farmacol&oacute;gicas, neopl&aacute;sicas   o endocrinas). Una situaci&oacute;n especial aparece en los pacientes infectados   por el VIH, tanto debido a la propia naturaleza de la infecci&oacute;n como   a los f&aacute;rmacos utilizados en su control o a presencia de enfermedades   asociadas. Por ello, de forma operativa podemos distinguir tres situaciones   diferentes en un paciente con eosinofilia.</p>     <p><i>EOSINOFILIA EN EL PACIENTE AUTÓCTONO NO INFECTADO POR VIH</i></p>     <p>En nuestro pa&iacute;s, las principales causas pueden incluirse en siete grupos:   (i) farmacol&oacute;gicas (ii) al&eacute;rgicas, principalmente reacciones   de hipersensibilidad de tipo I (iii) inmunol&oacute;gicas no al&eacute;rgicas   (iv) neoplasias (v) alteraciones endocrinas y metab&oacute;licas (vi) parasitarias   (vii) trastornos idiop&aacute;ticos.</p>     <p>Las <b> causas farmacol&oacute;gicas</b> de eosinofilia son m&uacute;ltiples y presumiblemente   se incrementar&aacute;n a medida que se incorporen nuevos principios activos   al arsenal terap&eacute;utico. Por ello, en cualquier paciente con eosinofilia,   es esencial conocer de forma precisa la medicaci&oacute;n que recibe, ya que   algunos f&aacute;rmacos (incluso aquellos de empleo muy com&uacute;n) pueden   ser los responsables de esta alteraci&oacute;n anal&iacute;tica. En la <a href="#t1">tabla I</a> se recogen los f&aacute;rmacos m&aacute;s importantes, aunque somos conscientes de que el listado nunca puede ser exhaustivo (2,5-10). Tiene inter&eacute;s   se&ntilde;alar que la eosinofilia relacionada con f&aacute;rmacos, en ocasiones   no s&oacute;lo es un dato anal&iacute;tico sino que puede formar parte de un   cuadro cl&iacute;nico m&aacute;s grave en el que tambi&eacute;n aparecen manifestaciones   sist&eacute;micas (p. ej. fiebre, s&iacute;ndrome constitucional) o locales   (p. ej. exantema, infiltrados pulmonares, nefropat&iacute;a, hepatopat&iacute;a,   etc.). Por otro lado, aunque la eosinofilia farmacol&oacute;gica no suele asociarse   a atopia o a historia familiar, tanto en los pacientes con hepatopat&iacute;a   o nefropat&iacute;a previa, como en los acetiladores lentos, es m&aacute;s   frecuente que la poblaci&oacute;n general (2).</p>     <p align="center"><a name="t1"><img src="/img/revistas/ami/v21n5/revision_tabla1.gif" width="361" height="757"></a></p>      <p>    <br>Las <b>reacciones de hipersensibilidad</b> no farmacol&oacute;gicas mediadas por   IgE son una causa muy frecuente de eosinofilia. Las m&aacute;s frecuentes son   las rinitis (de las que existen diferentes variedades) y algunas formas de   asma. Tambi&eacute;n se incluir&iacute;an en este grupo algunas respuestas   inmunol&oacute;gicas a microorganismos, principalmente la aspergilosis bronco-pulmonar   al&eacute;rgica (11). En estas situaciones, los datos cl&iacute;nicos y los   ex&aacute;menes complementarios suelen permitir realizar un diagn&oacute;stico   simple. En casos dudosos, la realizaci&oacute;n de estudios espec&iacute;ficos   (p. ej. la demostraci&oacute;n de eosin&oacute;filos en la mucosa nasal, las   pruebas de provocaci&oacute;n bronquial o la medida de anticuerpos espec&iacute;ficos)   permiten el diagn&oacute;stico final.</p>     <p>Tambi&eacute;n existen otras <b> enfermedades inmunol&oacute;gicas no al&eacute;rgicas</b>   se asocian a eosinofilia. Desde un punto de vista patog&eacute;nico estas entidades   son de tres tipos: enfermedades autoinmunes &oacute;rgano-inespec&iacute;ficas,   autoinmunopat&iacute;as &oacute;rgano-espec&iacute;ficas e inmunodeficiencias.   Dentro de las <i> enfermedades autoinmunes sist&eacute;micas</i>, las que con mayor   frecuencia presentan eosinofilia son la enfermedad de Churg-Strauss (12,13)   y la fasciitis eosinof&iacute;lica (s&iacute;ndrome de Shulman) (14), una enfermedad   similar a la esclerodermia (pero en la que la epidermis y dermis est&aacute;n   respetadas), caracterizada por un inicio agudo, muy frecuentemente tras un   traumatismo, con eritema y edema asociado posteriormente a induraci&oacute;n   en la piel de las extremidades. Con mucho menor frecuencia, aparece eosinofilia   en otras enfermedades sist&eacute;micas como las formas graves de artritis   reumatoide, o la granulomatosis de Wegener. Las <i> formas localizadas de enfermedad   autoinmune</i> pueden afectar a diversos &oacute;rganos o sistemas (<a href="#t2">Tabla II</a>).   As&iacute; la afectaci&oacute;n pulmonar de origen inmune es caracter&iacute;stica   de la neumon&iacute;a eosin&oacute;fila (tanto cr&oacute;nica como aguda) (15,16).   La afectaci&oacute;n cut&aacute;nea de origen inmunol&oacute;gico asociada   a eosinofilia aparece en varias situaciones como: algunas formas de eczema,   la dermatitis herpetiforme, el p&eacute;nfigo, el penfigoide bulloso, la enfermedad   de Kimura (grandes masas subcut&aacute;neas en cuello o cabeza en pacientes   procedentes del sudeste asi&aacute;tico) (17), la hiperplasia angiolinfoide   con eosinofilia (lesiones superficiales m&aacute;s peque&ntilde;as que las   de la enfermedad de Kimura) (18), el s&iacute;ndrome de Wells (celulitis eosinof&iacute;lica,   con im&aacute;genes caracter&iacute;sticas en la histolog&iacute;a en &ldquo;forma   de llama&rdquo;) (19), el s&iacute;ndrome de Gleich (episodios recurrentes   de angioedema, urticaria, prurito, fiebre, aumento de peso, aumento de IgM   y eosinofilia) (20) y el s&iacute;ndrome NERDS (<i>nodules, eosinophilia, rheumatism,   dermatitis, swelling</i>; es decir n&oacute;dulos paraarticulares prominentes,   urticaria recurrente con con angioedema y eosinofilia tisular) (21). La principal   enfermedad del sistema hematopoy&eacute;tico no maligna que se asocia a eosinofilia   es la anemia perniciosa (22). Otras enfermedades localizadas con eosinofilia   afectan al tubo digestivo (p. ej. enfermedad inflamatoria cr&oacute;nica intestinal   y/o enteritis eosinof&iacute;lica) (23,24), al sistema nervioso (meningitis   eosinof&iacute;lica) (25) o genitourinario (cistitis eosinofilica (26), hemodi&aacute;lisis   (27) o di&aacute;lisis peritoneal (28).</p>       <p align="center"><a name="t2"><img src="/img/revistas/ami/v21n5/revision_tabla2.gif" width="361" height="587"></a></p>     <p>    ]]></body>
<body><![CDATA[<br>Las <i> inmunodeficiencias</i> que con mayor frecuencia se asocian a eosinofilia son   el s&iacute;ndrome de Job (29) y la enfermedad de Omenn (30). M&aacute;s rara   vez aparece en el s&iacute;ndrome de Wiskott-Aldrich y en la deficiencia selectiva   del IgA (en este caso asociada a fasciitis eosinofilica).</p>     <p>En diversas <b> neoplasias</b> puede aparecer eosinofilia, principalmente en la enfermedad   de Hodgkin (hasta en un 15% de casos) y en otras neoplasias hematol&oacute;gicas,   en concreto leucemias (sobre todo con fenotipo M4) y linfomas (sobre todo de   estirpe B (31). En lo que respecta a los tumores s&oacute;lidos, es m&aacute;s   frecuente en las neoplasias de c&eacute;lulas grandes no queratinizadas de   cuello, carcinomas indiferenciados de c&eacute;lulas grandes de pulmon, carcinomas   epidermoides de pene, vagina, piel y nasofaringe, adenocarcinomas de est&oacute;mago,   colon y endometrio as&iacute; como en el carcinoma transicional de vejiga. </p>     <p>Las dos principales <b> enfermedades endocrino-metab&oacute;licas</b> en las que puede   aparecer esta alteraci&oacute;n hematol&oacute;gica son la insuficiencia suprarrenal   (cr&oacute;nica y aguda) (32) y el embolismo por cristales de colesterol (33).</p>     <p>Aunque las <b> helmintosis</b> son mucho m&aacute;s frecuentes en el paciente procedente   de regiones tropicales o que ha viajado a las mismas, no debe olvidarse que   existen algunas parasitosis aut&oacute;ctonas capaces de producir eosinofilia   (34,35). Los helmintos aut&oacute;ctonos que con mayor frecuencia son capaces   de ocasionar eosinofilia se indican en la <a href="#t3">tabla III</a>.</p>     <p align="center"><a name="t3"><img src="/img/revistas/ami/v21n5/revision_tabla3.gif" width="361" height="207"></a></p>     <p>    <br>Finalmente existen algunos <b> procesos de causa desconocida</b> en los que la eosinofilia   es un dato importante. Las principales situaciones son el s&iacute;ndrome hipereosinof&iacute;lico   idiop&aacute;tico (36) la eosinofilia hereditaria (37) y la eosinofilia idiop&aacute;tica   adquirida. El <b> s&iacute;ndrome hipereosinof&iacute;lico</b> es un conjunto heterog&eacute;neo   de trastornos que se definen en la pr&aacute;ctica por la asociaci&oacute;n   de cuatro datos: a) eosinofilia superior a 1500 eosin&oacute;filos; b) persistencia   durante m&aacute;s de 6 meses; c) evidencia de afectaci&oacute;n de &oacute;rganos   y d) exclusi&oacute;n de otras causas capaces de ocasionar eosinofilia. Los   dos primeros criterios requieren una eosinofilia importante (moderada o intensa)   y la persistencia de la misma, descartando de esta forma eosinofilias transitorias.   El tercer criterio implica la afectaci&oacute;n de alg&uacute;n &oacute;rgano   o sistema. Los principales &oacute;rganos lesionados en el s&iacute;ndrome   hipereosinof&iacute;lico son (i) coraz&oacute;n, apareciendo afectaci&oacute;n   endomioc&aacute;rdica que por formaci&oacute;n de trombos y cicatrizaci&oacute;n   puede llevar a la insuficiencia cardiaca (ii) sistema nervioso central. lo   que puede manifestarse por fen&oacute;menos isqu&eacute;micos, encefalopat&iacute;a   difusa y/o neuropat&iacute;a perif&eacute;rica(iii) pulm&oacute;n, cuya manifestaci&oacute;n   caracter&iacute;stica es la tos asociada o no a infiltrados pulmonares, pero   sin asma (iv) piel, tanto en forma de urticaria /angioedema como por p&aacute;pulas   pruriginosas y (v) bazo, cuya manifestaci&oacute;n caracter&iacute;stica es   la esplenomegalia. Finalmente, deben excluirse otras entidades capaces de desencadenar   una eosinofilia prolongada. Como en todos los s&iacute;ndromes idiop&aacute;ticos,   este &uacute;ltimo criterio es complejo de aplicar ya que las pruebas precisas   para excluir &ldquo;todos&rdquo; los agentes conocidos no ha sido adecuadamente   definida. Por ello, en esta entidad se incluyen al menos tres tipos de procesos:   eosinofilias reactivas a procesos no identificados, trastornos clonales linfoides   que ocasionan eosinofilia reactiva a trav&eacute;s de citocinas y trastornos   clonales de la serie mieloide (38,39). Evidentemente, en los dos &uacute;ltimos   casos no deben cumplirse los criterios diagn&oacute;sticos de neoplasias linfoides   o mieloides que constituir&iacute;an causas secundarias. La <i> eosinofilia familiar</i>   es una situaci&oacute;n excepcional, caracterizada por una herencia autos&oacute;mica   dominante y en la que existen datos de afectaci&oacute;n cardiaca o neurol&oacute;gica   (37). Finalmente, existen casos de eosinofilia prolongada, sin causa explicable   en la que no existe evidencia de afectaci&oacute;n de &oacute;rganos, por lo   que conceptualmente no pueden ser incluidos dentro del s&iacute;ndrome hipereosinof&iacute;lico   y que pueden ser definidos como <i> eosinofilia idiop&aacute;tica adquirida</i>.</p>     <p><i>EOSINOFILIA EN EL PACIENTE AUTÓCTONO INFECTADO POR</i> VIH</p>     <p>La alteraci&oacute;n inmunol&oacute;gica caracter&iacute;stica de la infecci&oacute;n   por VIH es la disminuci&oacute;n de los linfocitos CD4. Las modificaciones   del fenotipo linfocitario se han asociado a un incremento en el n&uacute;mero   de eosin&oacute;filos a medida que avanza la inmunodepresi&oacute;n (40), apareciendo,   en algunas series hasta en un 12,6% de los pacientes (41). En nuestro pa&iacute;s   no existen estudios detallados acerca de este aspecto, aunque la impresi&oacute;n   generalizada es que la presencia de eosinofilia en los individuos infectados   por el VIH es menor que la descrita en las publicaciones citadas. De hecho,   algunos autores sugieren que los estudios dirigidos a aclarar el mecanismo   de la eosinofilia no aporta resultados en los pacientes con infecci&oacute;n   VIH (42). Sin embargo, existen algunas causas espec&iacute;ficas de eosinofilia   que deben ser consideradas de forma particular en este grupo. En concreto,   debieran valorarse las siguientes posibilidades: (i) toxicidad medicamentosa   (particularmente nevirapina, efavirenz y cotrimoxazol) (43-45) (ii) empleo   de f&aacute;rmacos estimulantes de la hemopoyesis (GM-CSF) (iii) insuficiencia   suprarrenal por citomegalovirus (46) (iv) parasitosis (<i>Isospora belli, Strongyloides stercoralis</i>) y (v) foliculitis eosinof&iacute;lica (47).</p>     <p>EOSINOFILIA IMPORTADA</p>     ]]></body>
<body><![CDATA[<p>Como se ha se&ntilde;alado previamente, la presencia de eosinofilia en este   contexto es casi exclusiva de las infecciones por helmintos. De forma excepcional,   puede aparecer esta alteraci&oacute;n anal&iacute;tica en algunas infecciones   bacterianas (p. ej. resoluci&oacute;n de una escarlatina o en formas cr&oacute;nicas   de tuberculosis o lepra), enfermedades v&iacute;ricas (resoluci&oacute;n de   una infecci&oacute;n v&iacute;rica o infecci&oacute;n VIH), micosis (especialmente   en la coccidioidomicosis) (48) o algunas protozoosis concretas (<i>Isospora belli,   Dientamoeba fragilis, Sarcocystis sp y Blastocystis hominis</i>) (49-52).</p>     <p>Planteado de esta forma, el diagn&oacute;stico de eosinofilia aparentemente   resulta sencillo, aunque en la pr&aacute;ctica debemos realizar algunas matizaciones   (2,53-58):</p>     <p>-<i>No todos los helmintos inducen eosinofilia del mismo grado</i>. As&iacute;,   se distinguen varios patrones de afectaci&oacute;n como (a) la ausencia de   eosinofilia (p. ej. hidatidosis no complicada); (b) formas fluctuantes (asociadas   a los movimientos del par&aacute;sito en los tejidos: <i> Loa loa, Dracunculus   medinensis, Gnathostoma spinigerum</i>); (c) elevada durante toda la infecci&oacute;n   (p. ej. <i> Toxocara canis, Trichinella spiralis</i>); (d) limitada a un estadio parasitario   (p. ej. fase larvaria de <i> Ascaris lumbricoides</i>); (e) de intensidad variable   atendiendo a las diferentes fases de la parasitosis (p. ej esquistosomosis,   estrongiloidosis o uncinariosis) o (f) presente tras un proceso intercurrente   o durante el tratamiento (rotura de un quiste hidat&iacute;dico, tratamiento   de una filariosis).</p>     <p>-El <i> estudio coproparasitario</i>, prueba b&aacute;sica en el diagn&oacute;stico   de las parasitosis intestinales, <i> posee una baja sensibilidad</i> en el diagn&oacute;stico   de eosinofilia. As&iacute;, por ejemplo, en el diagn&oacute;stico de estrongiloidosis,   incluso empleando t&eacute;cnicas coprol&oacute;gicas dirigidas, la sensibilidad   es menor del 50%.</p>     <p>-<i>Un mismo paciente pueden presentar simult&aacute;neamente varias parasitosis</i>,   siendo su participaci&oacute;n en la aparici&oacute;n de eosinofilia diferente.   As&iacute;, por ejemplo, la detecci&oacute;n en heces de <i> Trichuris trichura</i>   (que por s&iacute; mismo ocasiona exclusivamente una eosinofilia leve) asociada   a valores elevados de eosin&oacute;filos obliga a la b&uacute;squeda de otros   agentes causales.</p>     <p>-Es muy importante considerar los <i> aspectos geogr&aacute;ficos</i>, ya que   determinadas parasitosis poseen una distribuci&oacute;n localizada. As&iacute;,   por ejemplo, no debe considerarse la posibilidad de una infecci&oacute;n por <i>   Loa loa</i> en pa&iacute;ses diferentes de los del centro de Africa o una infecci&oacute;n   por <i> Clonorchis sinensis</i> u <i> Opistorchis viverrini</i> en personas que nunca han estado   en el Sudeste asi&aacute;tico.</p>     <p>PROTOCOLO DIAGNÓSTICO ANTE UN PACIENTE CON EOSINOFILIA</p>     <p>El estudio de un paciente con eosinofilia debe realizarse de forma ordenada,   empleando pruebas sencillas en una primera fase, que permitir&aacute;n un diagn&oacute;stico   directo en muchos casos y, en el resto permitir&aacute;n clasificar al paciente   en los tres grupos indicados previamente.</p>     <p>La <i> fase inicial</i> incluir&aacute; una anamnesis y exploraci&oacute;n f&iacute;sica   completa, un hemograma (que identificar&aacute; y permitir&aacute; conocer   el grado de eosinofilia, adem&aacute;s de evaluar las otras series), un estudio   bioqu&iacute;mico (que incluya evaluaci&oacute;n hep&aacute;tica, renal y muscular),   una radiograf&iacute;a de t&oacute;rax, un sistem&aacute;tico y sedimento de   orina y un estudio coproparasitario (tres muestras). En presencia de factores   de riesgo o datos cl&iacute;nicos sugerentes, deber&aacute; solicitarse una   serolog&iacute;a frente a VIH, con la autorizaci&oacute;n del paciente (<a href="#f1">Fig. 1</a>).</p>     <p align="center"><a name="f1"><img src="/img/revistas/ami/v21n5/revision_fig1.gif" width="369" height="368"></a></p>     ]]></body>
<body><![CDATA[<p>    <br>Tras la aplicaci&oacute;n de estas pruebas es posible realizar un diagn&oacute;stico   etiol&oacute;gico o al menos sugerir las pruebas necesarias para realizarlo.   As&iacute;, por ejemplo, ante la sospecha de una eosinofilia farmacol&oacute;gica   deber&aacute; suspenderse el o los f&aacute;rmacos potencialmente implicados,   a&ntilde;adiendo eventualmente corticoides si el cuadro cl&iacute;nico es grave.   Por otro lado, la presencia de datos localizadores (pulmonares, cut&aacute;neos,   osteo- articulares, etc.) llevar&aacute; a los estudios complementarios pertinentes   (estudios de imagen, endoscopia, biopsia tisular). En otros casos, tras la   aplicaci&oacute;n de este protocolo inicial &uacute;nicamente podr&aacute; clasificarse   la situaci&oacute;n del paciente en uno de los grupos mencionados</p>     <p>En el <i> paciente que no ha viajado a regiones tropicales y no est&aacute; infectado   por el VIH</i>, deber&aacute; considerarse la realizaci&oacute;n de varias pruebas   complementarias para descartar algunas entidades espec&iacute;ficas, ya mencionadas   previamente. Una ayuda diagn&oacute;stica consiste en considerar si el paciente   presenta datos localizadores &uacute;nicos (p. ej. pulmonares, cut&aacute;neas,   etc), m&uacute;ltiples datos localizadores o no existen otras manifestaciones   cl&iacute;nicas (<a href="#f2">Fig. 2</a>).</p>     <p align="center"><a name="f2"><img src="/img/revistas/ami/v21n5/revision_fig2.gif" width="366" height="390"></a></p>      <p>    <br>En el <i> paciente que no ha viajado a regiones tropicales y est&aacute; infectado   por el VIH</i> deber&aacute; reevaluarse de forma espec&iacute;fica el uso de f&aacute;rmacos   (cotrimoxazol, tuberculost&aacute;ticos, antirretrovirales), la presencia de   lesiones cut&aacute;neas (foliculitis eosinof&iacute;lica, DRESS) y el estudio   parasitario tanto coprol&oacute;gico (<i>Isospora belli, Strongyloides stercoralis</i>)   como serol&oacute;gico (<i>Strongyloides</i> sp). En ausencia de datos sugerentes,   deber&aacute; controlarse peri&oacute;dicamente el hemograma sin necesidad   de estudios m&aacute;s agresivos.</p>     <p>Finalmente, en el paciente en el que se sospeche patolog&iacute;a importada   se plantean dos situaciones diferentes (i) el paciente en el que existen datos   localizadores, en cuyo caso deber&aacute;n realizarse pruebas dirigidas tanto   de imagen (ecograf&iacute;a, TAC, RMN), obtenci&oacute;n de l&iacute;quidos   biol&oacute;gicos (estudio de esputo, punci&oacute;n lumbar, toracocentesis),   o toma de muestras de tejidos (p. ej. piel, h&iacute;gado, recto o m&eacute;dula &oacute;sea)   y (ii) si no existen datos de localizaci&oacute;n, en cuyo caso deber&aacute;n   realizarse estudios de despistaje que incluyen t&eacute;cnicas espec&iacute;ficas   de estudio de heces (p. ej. t&eacute;cnica de Baermann), obtenci&oacute;n de   contenido duodenal (mediante endoscopia o Entero-Test<sup>&reg;</sup>), estudios serol&oacute;gicos   dirigidos (p. ej. empleando ant&iacute;genos de <i> Schistosoma</i> sp., <i> Strongyloides</i>   sp. o <i> Dirofilaria</i> sp.), evaluaci&oacute;n de hemopar&aacute;sitos a diferentes   horas del d&iacute;a y con t&eacute;cnicas espec&iacute;ficas (test de Knott),   estudio de orina de 24 horas y, eventualmente, pruebas de provocaci&oacute;n   (test de Mazzotti).</p>     <p>CONSECUENCIAS PATOLÓGICAS DE LA EOSINOFILIA</p>     <p>De forma indirecta, la eosinofilia puede indicar la presencia de una parasitosis   que comprometa la vida del paciente y de esta forma ocasionar consecuencias   nocivas. As&iacute;, aunque el diagn&oacute;stico espec&iacute;fico de todas   las parasitosis es importante para efectuar un tratamiento etiol&oacute;gico,   sin lugar a dudas, el principal par&aacute;sito que debe descartarse es <i> Strongyloides stercoralis</i>. Esta afirmaci&oacute;n se debe a las caracter&iacute;sticas de   su ciclo biol&oacute;gico, su persistencia durante d&eacute;cadas en el organismo   y la posibilidad, relativamente elevada (59), de desarrollar un sindrome de   hiperinfecci&oacute;n cuando concurre una situaci&oacute;n de inmunodepresi&oacute;n   (p. ej. uso de corticoides a dosis elevadas o coinfecci&oacute;n por VIH).</p>     <p>Por otro lado, los eosin&oacute;filos son capaces de sintetizar y liberar   directamente un gran n&uacute;mero de mediadores proinflamatorios. Aunque ha   sido controvertido, en la actualidad existen datos suficientes para afirmar   que los eosin&oacute;filos (a trav&eacute;s de sus mediadores) juegan un papel   importante en el control de la fase larvaria de las parasitosis (60,61). Por   ello, la eosinofilia inducida por las helmintosis puede interpretarse como   un mecanismo de defensa del hospedador. Sin embargo, estos mediadores inflamatorios   liberados por los eosin&oacute;filos, pueden lesionar diversas estructuras   del propio hospedador, siendo muy caracter&iacute;stica la afectaci&oacute;n   cardiaca (62). La lesi&oacute;n de las estructuras del coraz&oacute;n en la   eosinofilia puede adoptar dos formas polares: fibrosis endomioc&aacute;rdica   de Davies (en &aacute;reas tropicales) o Loeffler (en regiones templadas) y   miocarditis eosinof&iacute;lica (62). Independientemente de la forma cl&iacute;nica   que adopte, la afectaci&oacute;n cardiaca por la eosinofilia inducida por par&aacute;sitos   ha sido documentada en estudios epidemiol&oacute;gicos as&iacute; como en trabajos   experimentales cl&iacute;nicos o en modelos animales (63-66). Sin embargo,   en la actualidad quedan muchos aspectos no aclarados acerca de esta asociaci&oacute;n,   como la relaci&oacute;n entre la afectaci&oacute;n cardiaca eosin&oacute;fila   con el tipo de par&aacute;sito causal, la importancia del grado de eosinofilia   o la presencia de casos subcl&iacute;nicos.</p>     ]]></body>
<body><![CDATA[<p>MANEJO TERAPÉUTICO DE UN PACIENTE CON EOSINOFILIA</p>     <p>Evidentemente, la mejor forma de corregir una eosinofilia es el <i> tratamiento   etiol&oacute;gico</i>. En este sentido, la retirada de la medicaci&oacute;n responsable   (eventualmente asociada a corticosteroides en formas graves) har&aacute; desaparecer   la eosinofilia debidas a f&aacute;rmacos; la correcci&oacute;n del defecto   vitam&iacute;nico normalizar&aacute; el hemograma en la anemia megalobl&aacute;stica   o la administraci&oacute;n hormonal corregir&aacute; las alteraciones de la   insuficiencia suprarrenal.</p>     <p>El manejo de la eosinofilia producida por helmintos requiere algunas consideraciones   especiales. As&iacute;, en la pr&aacute;ctica todas las enfermedades tratables   por helmintos responden a uno o varios de estos f&aacute;rmacos: albendazol,   ivermectina, praziquantel, mebendazol y triclabendazol (67-69). La dietilcarbamacina,   que todav&iacute;a se indica en muchos textos actuales como tratamiento de   las filariosis, adem&aacute;s de sus importantes efectos secundarios, presenta   un problema pr&aacute;ctico: su dificultad de obtenci&oacute;n por m&eacute;todos   convencionales. El <i> praziquantel</i> es el f&aacute;rmaco de elecci&oacute;n en   las cestodosis por adultos (teniosis, difilobotriosis e infecci&oacute;n por <i>   Hymenolepis</i> sp) as&iacute; como en las trematodosis (esquistosomosis, paragonimosis,   etc). En las cestodosis por formas larvarias (hidatidosis, cisticercosis) el   tratamiento farmacol&oacute;gico tiene un papel colateral. En los casos en   los que est&aacute; indicado, el albendazol es el que presenta una actividad   mayor en las equinococosis (70,71), mientras que el praziquantel es m&aacute;s   eficaz en la cisticercosis (72,73). Las geohelmintosis (infecciones por <i> Trichuris,   Ascaris</i> y uncinarias) y otras nematodosis intestinales (Enterobius vermicularis)   responden adecuadamente a <i> mebendazol</i> o <i>albendazol</i>, siendo en general m&aacute;s   eficaz el albendazol que el mebendazol (con excepci&oacute;n de la infecci&oacute;n   por <i> Trichuris</i> en la que sucede lo contrario) (70,74). El albendazol tambi&eacute;n   es &uacute;til en el tratamiento de la toxocariosis (75), la triquinelosis   (76) y la infecci&oacute;n por <i> Ancylostoma caninum</i> o <i> braziliensis</i> (larva cut&aacute;nea   migrans) (77). La ivermectina constituye el f&aacute;rmaco de elecci&oacute;n   de la mayor parte de las filariosis (linf&aacute;ticas, oncocercosis, loaosis   e infecciones por <i> Mansonella streptocerca</i> y <i> Mansonella ozzardi</i>) con excepci&oacute;n   de <i> Mansonella perstans</i> (que se trata con mebendazol de forma prolongada) (78-80).   La <i> ivermectina</i> tambi&eacute;n constituye el f&aacute;rmaco de elecci&oacute;n   en la infecci&oacute;n por <i> Strongyloides stercoralis</i> (81) y es &uacute;til   en el tratamiento de la larva cut&aacute;nea migrans (77). Finalmente el triclabendazol   es el f&aacute;rmaco actual de elecci&oacute;n en el tratamiento de la fasciolosis   (82). La baja toxicidad de estos f&aacute;rmacos, su comodidad de administraci&oacute;n   y el efecto sin&eacute;rgico de algunas combinaciones (p. ej. ivermectina y   albendazol en las filariosis linf&aacute;ticas) (78) han sugerido su empleo   emp&iacute;rico en situaciones en las que, aunque no se haya demostrado una   helmintosis, se plantee esta posibilidad (83) o antes de efectuar el diagn&oacute;stico   de s&iacute;ndrome hipereosinof&iacute;lico (38).</p>     <p>En otras ocasiones, &uacute;nicamente puede realizarse un <i> tratamiento patog&eacute;nico</i>,   disminuyendo el n&uacute;mero de eosin&oacute;filos, y de esta forma su potencial   pat&oacute;geno. Los corticosteroides constituyen el f&aacute;rmaco habitual   en el manejo de las eosinofilias relacionadas con fen&oacute;menos inmunes   o idiop&aacute;ticas. El mecanismo de acci&oacute;n de estos f&aacute;rmacos   es doble, ya que disminuyen la eosinofilopoyesis y promueven la eliminaci&oacute;n   de eosin&oacute;filos al incrementar la apoptosis y secuestro de estas c&eacute;lulas   (84).</p>     <p>El manejo inicial de la eosinofilia idiop&aacute;tica (<a href="#f3">Fig. 3</a>) requiere, adem&aacute;s   del eventual tratamiento antihelm&iacute;tico (ivermectina 400 &micro;g/Kg   y albendazol 400 mg en dosis &uacute;nica), la valoraci&oacute;n de afectaci&oacute;n   de &oacute;rganos. Si no existe afectaci&oacute;n tisular, es aconsejable el   seguimiento cada 6 meses, replanteando el diagn&oacute;stico y realizando un   ecocardiograma de control (ya que la lesi&oacute;n cardiaca puede progresar   insidiosamente, sin relaci&oacute;n con la eosinofilia sangu&iacute;nea). Si   existe afectaci&oacute;n org&aacute;nica, es importante estudiar la presencia   de datos de clonalidad (anomal&iacute;as cromos&oacute;micas, poblaciones con   id&eacute;ntico fenotipo, hibridaci&oacute;n <i>in situ</i>, etc.). En presencia de   monoclonalidad, el tratamiento ser&aacute; el de la neoplasia hematol&oacute;gica   responsable (quimioterapia y/o transplante de m&eacute;dula &oacute;sea). Espec&iacute;ficamente   en los casos de s&iacute;ndrome hipereosinof&iacute;lico idiop&aacute;tico   en los que se compruebe la translocaci&oacute;n t (1,4) (q44,q12) est&aacute; indicado   el tratamiento con imatinib (39,85). Si no se detecta clonalidad, el tratamiento   inicial debe realizarse con prednisona (1 mg/kg/d&iacute;a) en dosis descendentes   hasta alcanzar la m&iacute;nima dosis necesaria. Son factores que predicen   una buena respuesta a los corticoides la asociaci&oacute;n con angioedema,   la elevaci&oacute;n de IgE y la eosinopenia prolongada tras una &uacute;nica   dosis de corticoides (86). En aquellos casos en los que no existe respuesta   a los corticoides puede emplearse a-interfer&oacute;n (87,88) o ciclosporina   (89). Finalmente en casos muy agresivos debe intentarse el uso de quimioterapia   (84) y eventualmente transplante de m&eacute;dula &oacute;sea (90-92).</p>     <p align="center"><a name="f3"><img src="/img/revistas/ami/v21n5/revision_fig3.gif" width="748" height="404"></a></p>      <p>    <br>AGRADECIMIENTOS</p>     <p>Este trabajo ha sido desarrollado, en parte, gracias al proyecto FIS 01/685.</p>      <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="4"><i>Bibliograf&iacute;a</i></font></p>     <!-- ref --><p>1. Rothenberg ME. Eosinophilia. N Engl J Med 1998; 338: 1592-600.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=555214&pid=S0212-7199200400050001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>2. Brigden ML. A practical workup for eosinophilia. You can investigate the most likely causes right in your office. Postgrad Med 1999; 105; 193-210.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=555216&pid=S0212-7199200400050001000002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>3. Keystone JS, Philpott J. 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