<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462004000100011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Infección por Mycobacterium Tuberculosis en pacientes infectados por el virus de la inmunodeficiencia humana]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales Aguirre]]></surname>
<given-names><![CDATA[José Juan]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ornelas Carsolio]]></surname>
<given-names><![CDATA[María Elena]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Barreto]]></surname>
<given-names><![CDATA[Demóstenes]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Departamento de Infectología y Epidemiología ]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<volume>61</volume>
<numero>1</numero>
<fpage>87</fpage>
<lpage>98</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462004000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462004000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462004000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La tuberculosis (Tb) es la infección más frecuentemente observada en el mundo en personas infectadas y no infectadas por el virus de la inmunodeficiencia humana (VIH), pero las personas infectadas por el VIH tienen un riesgo de hasta 50 veces más de desarrollar Tb, y se calcula que del total de personas infectadas por Tb en el mundo, 8% están co-infectadas por VIH. En pacientes con CD4 mayor de 15%, las manifestaciones clínicas no difieren de las observadas en las personas no infectadas por VIH, pero en aquellos que presentan inmunosupresión grave las manifestaciones clínicas pueden no ser tan evidentes debido a la pobre respuesta inflamatoria. Por otra parte, los pacientes VIH+ co-infectados con Tb tienen mayor riesgo de desarrollar formas graves, recaídas, infección por cepas multirresistentes, mayor frecuencia de reacciones adversas a los antifímicos y secundariamente mayor mortalidad. Es por ello importante que en los pacientes infectados por VIH se identifiquen factores de riesgo para Tb y se instauren profilaxis oportunamente, ya que está plenamente demostrada la eficacia de los diversos esquemas de profilaxis contra Tb. Este artículo pretende dar un panorama general de la infección por micobacterias tuberculosas en pacientes infectados por VIH.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Tuberculosis (Tb) is one of the most common infection observed in patients infected or not infected by HIV; HIV infected patients have a 50-fold risk than non-infected patients to develop Tb; it is worldwide estimated that 8 millions of persons are co-infected with Tb and HIV. Infected HIV patients with CD4 cells over 15% presents a clinical picture similar to non-infected cases; in severe inmunodeficient patients, clinical manifestations are hidden by the poor inflammatory response. On the other hand, patients co-infected with Tb and HIV have a higher risk to develop diseminated Tb forms, relapses, to be affected by multi-drug resistant Tb, and to present adverse anti-fimic reactions. Early prophylactic management are useful to prevent Tb in HIV infected patients.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tuberculosis]]></kwd>
<kwd lng="es"><![CDATA[virus de las inmunodeficiencia en]]></kwd>
<kwd lng="es"><![CDATA[Mycobacterium tuberculosis]]></kwd>
<kwd lng="en"><![CDATA[Tuberculosis]]></kwd>
<kwd lng="en"><![CDATA[human immunodeficiency virus]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><font size="2" face="Verdana">Bol M&eacute;d Hosp Infant M&eacute;x 2004; Vol. 61(1):87-98<b>    <br> TERAP&Eacute;UTICA EN PEDIATR&Iacute;A</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana"><b>Infecci&oacute;n por <i>Mycobacterium  Tuberculosis</i> en pacientes infectados por el virus de la inmunodeficiencia humana</b></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Dr.. Jos&eacute; Juan Morales Aguirre    <br>   Dra. Mar&iacute;a Elena Ornelas Carsolio    <br>   Dr. Dem&oacute;stenes G&oacute;mez Barreto</b>    <br> Departamento de Infectolog&iacute;a y Epidemiolog&iacute;a, Hospital Infantil de M&eacute;xico Federico G&oacute;mez, M&eacute;xico, D. F., M&eacute;xico.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><b>Solicitud de sobretiros</b>: Dr. Jos&eacute; Juan Morales Aguirre, Departamento de Infectolog&iacute;a y Epidemiolog&iacute;a, Hospital Infantil de M&eacute;xico Federico G&oacute;mez, Calle Dr. M&aacute;rquez 162, Col. Doctores, Deleg. Cuauht&eacute;moc, C.P. 06720, M&eacute;xico, D.F., M&eacute;xico.    <br> </font></p>     <p><font size="2" face="Verdana">Fecha de recepci&oacute;n: 10-03-2003.    <br>   Fecha de aprobaci&oacute;n: 30-10-2003. </font></p>     <p>&nbsp; </p>     <p><font size="2" face="Verdana"><b>RESUMEN</b>    <br>         <br>   La tuberculosis (Tb) es la infecci&oacute;n m&aacute;s frecuentemente observada en el mundo en personas infectadas y no infectadas por el virus de la inmunodeficiencia humana (VIH), pero las personas infectadas por el VIH tienen un riesgo de hasta 50 veces m&aacute;s de desarrollar Tb, y se calcula que del total de personas infectadas por Tb en el mundo, 8% est&aacute;n co-infectadas por VIH. En pacientes con CD4 mayor de 15%, las manifestaciones cl&iacute;nicas no difieren de las observadas en las personas no infectadas por VIH, pero en aquellos que presentan inmunosupresi&oacute;n grave las manifestaciones cl&iacute;nicas pueden no ser tan evidentes debido a la pobre respuesta inflamatoria. Por otra parte, los pacientes VIH+ co-infectados con Tb tienen mayor riesgo de desarrollar formas graves, reca&iacute;das, infecci&oacute;n por cepas multirresistentes, mayor frecuencia de reacciones adversas a los antif&iacute;micos y secundariamente mayor mortalidad. Es por ello importante que en los pacientes infectados por VIH se identifiquen factores de riesgo para Tb y se instauren profilaxis oportunamente, ya que est&aacute; plenamente demostrada la eficacia de los diversos esquemas de profilaxis contra Tb.    <br>   Este art&iacute;culo pretende dar un panorama general de la infecci&oacute;n por micobacterias tuberculosas en pacientes infectados por VIH.     <br>       ]]></body>
<body><![CDATA[<br> </font><font size="2" face="Verdana"><b>PALABRAS CLAVE </b>Tuberculosis; virus de las inmunodeficiencia en;  <i>Mycobacterium tuberculosis</i></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>ABSTRACT</b>    <br>       <br> Tuberculosis (Tb) is one of the most common infection observed in patients infected or not infected by HIV; HIV infected patients have a 50-fold risk than non-infected patients to develop Tb; it is worldwide estimated that 8 millions of persons are co-infected with Tb and HIV. Infected HIV patients with CD4 cells over 15% presents a clinical picture similar to non-infected cases; in severe inmunodeficient patients, clinical manifestations are hidden by the poor inflammatory response. On the other hand, patients co-infected with Tb and HIV have a higher risk to develop diseminated Tb forms, relapses, to be affected by multi-drug resistant Tb, and to present adverse anti-fimic reactions. Early prophylactic management are useful to prevent Tb in HIV infected patients.</font></p>     <p><font size="2" face="Verdana"><b>KEY WORDS</b>. Tuberculosis, human immunodeficiency virus. </font></p>     <p>&nbsp;  </p>     <p><font size="2" face="Verdana"><b>Epidemiolog&iacute;a</b> </font></p>     <p><font size="2" face="Verdana"><i>Epidemiolog&iacute;a en el mundo </i></font></p>     <p><font size="2" face="Verdana"> La tuberculosis (Tb) es la infecci&oacute;n oportunista grave m&aacute;s frecuente en todo el mundo, afectando especialmente a pa&iacute;ses africanos y asi&aacute;ticos. Cada a&ntilde;o se reportan 8 a 10 millones de casos nuevos de Tb y 2 millones de muertes en la poblaci&oacute;n en general. <SUP>1,2</SUP> Se considera que un tercio de la poblaci&oacute;n mundial (1 700 millones de individuos) tienen una infecci&oacute;n latente. Con la epidemia del s&iacute;ndrome de inmunodeficiencia adquirida (SIDA) se ha observado un incremento de casos de Tb pulmonar y extrapulmonar. <SUP>3</SUP> calcul&aacute;ndose que de los 8.8 millones de casos de Tb observados en el mundo en 1995 y de los 7.9 millones de casos en 1997, cerca de 740 000 (8.4%) y 640 000 (8%) respectivamente, presentaban infecci&oacute;n por el virus de la inmunodeficiencia humana (VIH). <SUP>4</SUP> Una consecuencia del resurgimiento de la Tb ha sido la aparici&oacute;n de <i>   Mycobacterium tuberculosis </i> multirresistente, la cual se define como resistencia a por lo menos isoniacida y rifampicina, habi&eacute;ndose reportado varios brotes por estas cepas en personas co-infectadas por VIH. <SUP>5-8</SUP> La incidencia de Tb en personas adultas seronegativas es de 1.7 a 7.9 casos por 100 personas/a&ntilde;o, mientras que la incidencia en pacientes co-infectados por Tb y VIH se desconoce. <SUP>9</SUP> Estudios realizados en ni&ntilde;os muestran que la infecci&oacute;n por <i> M. tuberculosis </i> es m&aacute;s frecuente en ni&ntilde;os infectados por VIH; as&iacute; en un estudio realizado en Nueva York, se observ&oacute; una incidencia de Tb en ni&ntilde;os VIH positivos de 0.6 y en ni&ntilde;os VIH negativos de 0.2 casos por 100 ni&ntilde;os/a&ntilde;o. De esta manera, 3% de ni&ntilde;os infectados por VIH desarrollaron Tb y en los ni&ntilde;os VIH negativos s&oacute;lo se observ&oacute; en 0.5%.<SUP>10</SUP> En Estados Unidos de Am&eacute;rica (EUA), se observ&oacute; un incremento de casos de Tb en ni&ntilde;os durante el per&iacute;odo de 1985-1992; <SUP>2</SUP> posteriormente, hubo una disminuci&oacute;n en el n&uacute;mero de casos con 1 708 casos en 1992 y 1 372 casos en 1996.<SUP>11,12</SUP> De los casos acumulados de infecci&oacute;n por VIH hasta junio de 1997 se realiz&oacute; el diagn&oacute;stico de Tb en 1.1% en los menores de cinco a&ntilde;os, en 2% en ni&ntilde;os de 6 a 12 a&ntilde;os, en 3.8% en adolescentes de 13 a 19 a&ntilde;os y en 5.6% en adultos mayores de 19 a&ntilde;os; se considera que estas cifras son bajas ya que el diagn&oacute;stico de Tb se realiz&oacute; en etapas tempranas de la enfermedad por VIH, as&iacute; la frecuencia de Tb en casos de VIH m&aacute;s avanzados se desconoce. <SUP>13</SUP></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">En pa&iacute;ses en v&iacute;as de desarrollo, la incidencia de Tb es mucho mayor y para algunos pa&iacute;ses africanos es de 650 casos por 100 000 personas por a&ntilde;o, <SUP>14</SUP>   esto contrasta con una incidencia anual en EUA de 7.4 casos por 100 000 personas.<SUP>9,15</SUP></font></p>     <p><font size="2" face="Verdana">En el <a href="/img/revistas/bmim/v61n1/n1a11t1.jpg" target="_blank">cuadro 1</a> se muestra la prevalencia de VIH en pacientes infectados por Tb en algunas regiones del mundo.</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><i>Epidemiolog&iacute;a en M&eacute;xico </i></font></p>     <p><font size="2" face="Verdana">Existen pocos estudios publicados sobre la situaci&oacute;n de la Tb en M&eacute;xico; adem&aacute;s, la informaci&oacute;n no es consistente y no es posible obtener datos sobre las tendencias epidemiol&oacute;gicas de esta entidad. En estudios en poblaciones no infectadas por VIH realizados en escolares, Izaguirre y col. <SUP>16</SUP> en 1961 reportaron una prevalencia de 10%, C&aacute;rdenas y col. <SUP>17</SUP> en Guerrero en 1987 reportaron una prevalencia de 2.5% as&iacute; como Mercado y col. <SUP>18</SUP> en Jalisco observaron una prevalencia del 6.3%, con una variaci&oacute;n entre los que tienen antecedente de aplicaci&oacute;n de BCG (7.4%) y los que no la tienen (4.5%). Por otra parte, la tasa anual de Tb durante el per&iacute;odo de 1996 al a&ntilde;o 2000 reportada por la Direcci&oacute;n General de Epidemiolog&iacute;a (DGE) fue de aproximadamente 15 casos por 100 000 habitantes. </font></p>     <p><font size="2" face="Verdana">En el Hospital Infantil de M&eacute;xico Federico G&oacute;mez, en una serie de 190 casos acumulados de ni&ntilde;os infectados por VIH hasta el a&ntilde;o 2000, se observaron 34 casos de Tb que correspondieron a una proporci&oacute;n de 18% y de un total de 311 casos de Tb acumulados en diez a&ntilde;os (1990-2000), 24 pacientes presentaron co-infecci&oacute;n con VIH (7.1%) (datos de los autores a&uacute;n no publicados).</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><i>Mortalidad </i></font></p>     <p><font size="2" face="Verdana"> El riesgo de muerte en pacientes co-infectados por VIH y Tb es el doble del observado en pacientes no infectados por VIH, siendo el grado de inmunosupresi&oacute;n el predictor m&aacute;s importante de la supervivencia en pacientes VIH positivos. <SUP>10,18</SUP> Se ha observado una mayor mortalidad en pacientes con niveles elevados de neopterina (&gt;14 ng/mL), factor de necrosis tumoral a (FNT&alpha;) (&gt;de 6.5 ng/mL) y respuesta an&eacute;rgica a la prueba de tuberculina; las citocinas mencionadas se encuentran elevadas con m&aacute;s frecuencia en pacientes con tratamientos antif&iacute;micos que no contienen rifampicina. Estos esquemas sin rifampicina han mostrado tener mayor riesgo de mortalidad y reacciones adversas; de esta manera, en un estudio se observ&oacute; un riesgo relativo (RR) de 6.3 para mortalidad y de 13 para reacciones adversas en pacientes con esquemas que conten&iacute;an estreptomicina, isoniacida y tiacetazona <i>   versus </i>    rifampicina, isoniacida y pirazinamida.  <SUP>19</SUP></font></p>     <p><font size="2" face="Verdana">La mortalidad en ni&ntilde;os co-infectados por VIH y <i> M. tuberculosis </i> en &Aacute;frica es de 21 a 24%. <SUP>20,21</SUP></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Para el a&ntilde;o 1982 en la Rep&uacute;blica Mexicana, la Tb ocup&oacute; el tercer lugar como causa de mortalidad. <SUP>22</SUP> La tasa de mortalidad en M&eacute;xico en 1992 fue de 5.8/100 000 habitantes. <SUP>23,24</SUP>   Larraza y Ondarza  <SUP>25</SUP> en un estudio realizado en autopsias en el Hospital General de M&eacute;xico durante el lapso de 1976-1980, reportaron una frecuencia de Tb de 9.34%. </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Patog&eacute;nesis</b> </font></p>     <p><font size="2" face="Verdana"><i>Interacci&oacute;n entre M. tuberculosis y el VIH </i></font></p>     <p><font size="2" face="Verdana"> Se sabe que uno de los blancos principales en la infecci&oacute;n por VIH son los linfocitos CD4. Por otro lado, hay que considerar que estas c&eacute;lulas est&aacute;n involucradas en los mecanismos de defensa inmune contra <i>   M. tuberculosis </i>        <SUP>25</SUP> en las personas infectadas por VIH, estas c&eacute;lulas est&aacute;n afectadas con disminuci&oacute;n en su n&uacute;mero y funci&oacute;n, los linfocitos Th-1 producen interfer&oacute;n &alpha; y esto es importante en los mecanismos de defensa contra infecciones por micobacterias. As&iacute; se ha observado que los ni&ntilde;os con defectos en la producci&oacute;n de interfer&oacute;n &alpha; desarrollan formas graves y fatales de Tb. <SUP>26</SUP> Se ha observado que el interfer&oacute;n a, que es esencial para la inhibici&oacute;n de la replicaci&oacute;n de los bacilos en el medio intracelular de los macr&oacute;fagos, se encuentra en bajas concentraciones en las personas infectadas por VIH-1 y ello incrementa el riesgo de infecciones por <i>   M. tuberculosis </i>        <SUP>27</SUP> En estudios realizados con linfocitos perif&eacute;ricos de pacientes co-infectados por VIH y Tb, que se exponen a <i>   M. tuberculosis in vitro </i> , se observ&oacute; que estos producen menos interfer&oacute;n a y similares cantidades de interleucinas 4 y 10, comparado con linfocitos de pacientes infectados por VIH pero sin infecci&oacute;n por Tb; <SUP>28</SUP> estos estudios sugieren que la respuesta de los linfocitos Th-1 est&aacute; disminuida en pacientes infectados por VIH, contribuyendo a la mayor susceptibilidad a infectarse por Tb, igualmente la infecci&oacute;n por Tb puede afectar la evoluci&oacute;n de la infecci&oacute;n por VIH en forma desfavorable, ya que se ha demostrado que incrementa la replicaci&oacute;n viral por medio de una elevaci&oacute;n en la producci&oacute;n de FNT &alpha;, interleucina 1 e interleucina 6, acelerando la replicaci&oacute;n viral del VIH. <SUP>29-31</SUP> En un estudio, la exposici&oacute;n de macr&oacute;fagos alveolares y linfocitos de pacientes infectados por VIH a <i> M. tuberculosis in vitro </i> , se observ&oacute; incremento en la replicaci&oacute;n del VIH. <SUP>32,33</SUP> Tambi&eacute;n se ha observado que el l&iacute;quido pleural de pacientes con Tb, incrementa la replicaci&oacute;n del VIH en linfocitos activados; <SUP>30</SUP> por lo tanto la infecci&oacute;n por Tb en pacientes infectados con VIH provoca que el curso de la infecci&oacute;n por VIH se acelere.<SUP>34,35</SUP></font></p>     <p><font size="2" face="Verdana">Las personas VIH negativas con Tb latente almacenan bacilos viables y tienen un riesgo de 10% de desarrollar Tb durante toda su vida; mientras que en personas VIH positivas y co-infectadas por <i>   M. tuberculosis </i> , el riesgo es mucho mayor y var&iacute;a de 2.5 a 15% por cada a&ntilde;o de vida, por lo que el riesgo de desarrollar Tb en este grupo es de 25 a 50 veces mayor que en personas sin infecci&oacute;n por VIH.<SUP>35-39</SUP> Aunque es dif&iacute;cil diferenciar entre infecci&oacute;n primaria y reactivaci&oacute;n, la mayor parte de los casos de Tb en ni&ntilde;os infectados por VIH probablemente sean infecciones primarias.<SUP>40</SUP> Estudios previos realizados en adultos, sugirieron que 90% de los casos de Tb ocurr&iacute;an por reactivaci&oacute;n, pero estudios recientes utilizando el an&aacute;lisis FPLP ( <i> Restriction-Fragment Length Polymorphism analysis </i> ) muestra que hasta la mitad de los casos de Tb en pacientes VIH positivos y negativos son de transmisi&oacute;n reciente.<SUP>41,42</SUP></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Co-infecci&oacute;n por VIH y Tb. &iquest;Qu&eacute; tan contagioso es el paciente VIH +?</b></font></p>     <p><font size="2" face="Verdana">Existe poca informaci&oacute;n acerca de la contagiosidad de <i>   M. tuberculosis </i> en adultos co-infectados por VIH y los datos en ni&ntilde;os son anecd&oacute;ticos. Algunos estudios refieren que los pacientes no infectados por VIH son m&aacute;s contagiosos que los pacientes co-infectados por VIH, como lo reporta Elliot y col. <SUP>42</SUP>  en un estudio donde 52% de contactos de pacientes con Tb VIH positivos y 71% de contactos de Tb VIH negativos desarrollaron reacci&oacute;n positiva a la tuberculina. As&iacute; mismo, Espinal y col. <SUP>43</SUP> en su estudio, observaron que 61% de contactos de los pacientes VIH positivos y 76% de contactos de pacientes VIH negativos presentaron reacci&oacute;n a la tuberculina (PPD) mayor de 5 mm y en este reporte el an&aacute;lisis multivariado demostr&oacute; que menos casos de contactos de pacientes infectados por VIH, tuvieron respuesta positiva a la reacci&oacute;n con tuberculina, lo cual corrobor&oacute; que los pacientes co-infectados por VIH y Tb tienen menos probabilidad de transmitir <i>   M. tuberculosis </i>    que los pacientes VIH negativos. Por otro lado, Klausner y col.    <SUP>44</SUP> no demostraron diferencia en la transmisi&oacute;n de <i>   M. tuberculosis </i>    entre 1 200 contactos caseros de pacientes con Tb VIH positivos y negativos en Zaire.</font></p>     <p><font size="2" face="Verdana">Aunque, como se menciona en el p&aacute;rrafo anterior, sobre la menor contagiosidad de los pacientes VIH positivos, es importante recalcar que el contacto estrecho y continuo con pacientes co-infectados por VIH y Tb en los hospitales, pone en riesgo al personal de salud de adquirir m&aacute;s f&aacute;cilmente <i> M. tuberculosis </i> que el personal de salud que no atiende este tipo de pacientes. <SUP>45-51</SUP> En estudios realizados entre el personal de salud que atiende a pacientes VIH positivos la conversi&oacute;n en la prueba de tuberculina fue de 19 a 50%. <SUP>47-51</SUP></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Manifestaciones cl&iacute;nicas </b></font></p>     <p><font size="2" face="Verdana"> Aunque es conocido que las manifestaciones cl&iacute;nicas de Tb son variables y pueden incluso confundirse con otras entidades, en los pacientes co-infectados por VIH la sintomatolog&iacute;a puede ser escasa debido a que tienen menor capacidad de respuesta inflamatoria, por lo que debe investigarse de manera intencionada esta entidad en este grupo de pacientes de reciente diagn&oacute;stico. La Tb asociada a SIDA, descrita por primera vez en pacientes haitianos con SIDA avanzado, que se caracterizaba por su localizaci&oacute;n en los campos pulmonares medios o inferiores, ausencia de cavidades en la mayor parte de los casos y una incidencia aumentada de enfermedad extrapulmonar. En consecuencia, el cuadro cl&iacute;nico de la Tb asociada con la infecci&oacute;n por VIH est&aacute; determinado por el grado de inmunosupresi&oacute;n. <SUP>52</SUP>                          Las manifestaciones cl&aacute;sicas que se observan en la mayor&iacute;a de los casos son: fiebre, tos, dificultad respiratoria y p&eacute;rdida de peso.<SUP>53</SUP>                          La infecci&oacute;n del complejo primario usualmente no es evidente en la radiograf&iacute;a de t&oacute;rax y la infecci&oacute;n primaria en la mayor&iacute;a de los ni&ntilde;os inmunocomprometidos no progresa a enfermedad. Las manifestaciones cl&iacute;nicas tempranas ocurren de uno a seis meses despu&eacute;s de la infecci&oacute;n inicial que incluyen: p&eacute;rdida de peso, fiebre, tos, sudoraci&oacute;n nocturna y escalofr&iacute;os. Las manifestaciones radiogr&aacute;ficas incluyen: linfadenopat&iacute;a hiliar, mediastinal, cervical y otros ganglios, involucrando un l&oacute;bulo o segmento y ocasionalmente atelectasias o infiltrados, as&iacute; como derrame pleural, lesiones cavitadas <a href="/img/revistas/bmim/v61n1/n1a11t2.jpg" target="_blank">(Cuadro 2)</a>. Las manifestaciones cl&iacute;nicas en pacientes con Tb resistente a antif&iacute;micos son indistinguibles de aquellos con sensibilidad adecuada al manejo antif&iacute;mico.</font></p>     <p><font size="2" face="Verdana">Las personas VIH positivas tambi&eacute;n pueden adquirir una nueva infecci&oacute;n a partir de otros sujetos infectados, en estos casos el cuadro cl&iacute;nico consiste en una enfermedad difusa, diseminada y r&aacute;pidamente progresiva que a menudo es fatal.<SUP>54</SUP>                            </font></p>     <p><font size="2" face="Verdana">El pulm&oacute;n es el principal &oacute;rgano afectado por <i> M. tuberculosis </i> en personas infectadas por VIH observ&aacute;ndose en 70 a 90%.<SUP>55-60</SUP> </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><i>Infecci&oacute;n extrapulmonar por M. tuberculosis </i></font></p>     <p><font size="2" face="Verdana"> La Tb extrapulmonar se presenta en 30 a 80% de los pacientes co-infectados y est&aacute; en relaci&oacute;n directa con la gravedad de la inmunosupresi&oacute;n. <SUP>61,62</SUP> En ni&ntilde;os co-infectados con Tb y VIH, la afecci&oacute;n extrapulmonar se acompa&ntilde;a de manifestaciones pulmonares en 32 a 51%, <SUP>63-67</SUP> mientras que en ni&ntilde;os VIH negativos la afecci&oacute;n pulmonar s&oacute;lo se reporta en 24 a 28%. <SUP>67,68</SUP> Las manifestaciones extrapulmonares en pacientes con SIDA son comunes, siendo la infecci&oacute;n diseminada y la linfadenitis los sitios de afecci&oacute;n m&aacute;s comunes.<SUP>62</SUP>                                     </font></p>     <p><font size="2" face="Verdana">La afecci&oacute;n al sistema nervioso se observa en 14 a 15% en ni&ntilde;os con VIH <SUP>14,64,65,67</SUP>  y en los adultos se observa de 5 a 10%,  <SUP>69-74</SUP> la afecci&oacute;n del sistema nervioso central en adultos y ni&ntilde;os se presenta principalmente como meningitis, aunque los tuberculomas tambi&eacute;n son comunes.<SUP>75-77</SUP></font></p>     <p><font size="2" face="Verdana">La bacteriemia por <i>   M. tuberculosis </i>    se observa hasta en 20-40% de los pacientes adultos infectados por VIH y es rara en pacientes VIH negativos.  <SUP>78-81</SUP></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Se han descrito afecciones a sitios poco comunes, habi&eacute;ndose reportado hasta el momento seis casos de Tb miliar cut&aacute;nea en adultos, sin informarse casos en ni&ntilde;os <SUP>82</SUP> y la afecci&oacute;n al o&iacute;do es un evento raro report&aacute;ndose en 14 de 1 204 (0.8%) de ni&ntilde;os co-infectados.<SUP>83</SUP></font></p>     <p><font size="2" face="Verdana">Las reca&iacute;das de Tb ocurren principalmente en los dos primeros a&ntilde;os despu&eacute;s de concluir el tratamiento, y se presenta m&aacute;s frecuentemente en pacientes infectados por VIH. Los pacientes infectados por VIH tienen un riesgo relativo (RR) de 34 veces sobre los pacientes VIH negativos de presentar reca&iacute;das, favoreciendo este riesgo si el esquema no contiene rifampicina. <SUP>83,84</SUP> Otros investigadores no han demostrado diferencia en la proporci&oacute;n de reca&iacute;das entre pacientes adultos VIH positivos y negativos tratados con esquemas de seis meses que contengan rifampicina.<SUP>85</SUP> Entre los factores de riesgo asociados a reca&iacute;da se reportan: esquemas con rifampicina menor de nueve meses, cuentas bajas de c&eacute;lulas CD4 al inicio del tratamiento y poco apego al tratamiento antif&iacute;mico.<SUP>18,72</SUP></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Diagn&oacute;stico</b></font></p>     <p><font size="2" face="Verdana">En toda sospecha de infecci&oacute;n por <i>   M. tuberculosis </i> se deben considerar los aspectos epidemiol&oacute;gicos, cl&iacute;nicos y radiol&oacute;gicos. El diagn&oacute;stico es dif&iacute;cil de confirmar por cultivo, por lo que en la mayor&iacute;a de los casos se proporcionar&aacute; tratamiento a pacientes con la simple sospecha. Es importante diferenciar entre infecci&oacute;n y enfermedad; la infecci&oacute;n se define como la presencia de <i> M. tuberculosis </i> sin manifestaciones cl&iacute;nicas ni radiol&oacute;gicas y el diagn&oacute;stico se realiza por medio de la prueba cut&aacute;nea a la tuberculina (PPD), y la enfermedad se considera cuando el paciente presenta signos y s&iacute;ntomas secundarios o manifestaciones radiol&oacute;gicas, en este caso es posible que los pacientes no presenten positiva la prueba al PPD debido a la falla inmunol&oacute;gica secundaria a la infecci&oacute;n por VIH.</font></p>     <p><font size="2" face="Verdana">La Tb latente o infecci&oacute;n se diagnostica por medio de la prueba cut&aacute;nea con tuberculina o prueba de Mantoux, aplic&aacute;ndose 5U de un derivado de prote&iacute;na purificada (PPD) por v&iacute;a intrad&eacute;rmica y se realiza la lectura (se mide el tama&ntilde;o de la induraci&oacute;n) a las 48-72 horas. En pacientes infectados por VIH, una induraci&oacute;n de 5 mm o m&aacute;s se considera positiva. Si los pacientes presentan una reacci&oacute;n de menos de 5 mm e historia de exposici&oacute;n a un caso de Tb se deber&aacute;n realizar estudios seriados de PPD al menos cada tres meses.<SUP>86</SUP> La prueba de tuberculina se debe aplicar en cuanto se diagnostique la infecci&oacute;n por VIH, tambi&eacute;n se debe repetir en aquellos pacientes que inicialmente estaban negativos al PPD y se sospecha tendr&aacute;n reconstituci&oacute;n inmune por el tratamiento antirretroviral altamente activo, que se define como aquel que contiene un inhibidor de proteasa (IP) ( <i> ej. </i> ritonavir) o un an&aacute;logo no nucle&oacute;sido( <i> ej. </i> efavirenz), cualquiera de &eacute;stos asociado a dos an&aacute;logos nucle&oacute;sidos de la transcriptasa reversa.<SUP>87</SUP> Debe tenerse en mente que las personas infectadas por VIH tienen resultados falsos negativos a la prueba de tuberculina a pesar de que almacenan bacilos tuberculosos, esto se debe a que la infecci&oacute;n por VIH es causa de anergia a ant&iacute;genos cut&aacute;neos. Anteriormente se suger&iacute;a que la anergia se asociaba con mayor probabilidad de desarrollar Tb, pero posteriormente se demostr&oacute; que esto no era as&iacute; y en 1997 un grupo de expertos recomend&oacute; no usar la anergia como criterio diagn&oacute;stico de Tb en pacientes infectados por VIH. <SUP>87</SUP> En cuanto a m&eacute;todos diagn&oacute;sticos r&aacute;pidos: el cultivo mediante m&eacute;todos radiom&eacute;tricos posee ventajas con respecto a las t&eacute;cnicas convencionales tradicionales, tales como mayor rapidez y la determinaci&oacute;n m&aacute;s expeditiva de la susceptibilidad microbiana, y los nuevos m&eacute;todos basados en la PCR tienen el potencial de proporcionar un diagn&oacute;stico micobacteriano espec&iacute;fico en el curso de 24 horas. El diagn&oacute;stico definitivo de Tb requiere del aislamiento por cultivo de <i> M. tuberculosis </i> de expectoraci&oacute;n, biopsia de tejido, l&iacute;quido cefalorraqu&iacute;deo, l&iacute;quido pleural, orina u otras secreciones; en el caso de ni&ntilde;os o adolescentes incapaces de tener expectoraci&oacute;n productiva se debe recolectar l&iacute;quido de aspirado g&aacute;strico, &eacute;ste se debe obtener por la ma&ntilde;ana mediante una sonda nasog&aacute;strica antes de que el ni&ntilde;o ingiera alimentos y deambule, en el caso de Tb pulmonar se deben obtener tres muestras y cada muestra deber&aacute; cultivarse, es importante realizar tinciones con t&eacute;cnica de Ziehl-Neelsen o con t&eacute;cnica de auramina rodamina, esta &uacute;ltima con ayuda de microscop&iacute;a fluorescente, tratando de identificar la presencia de microorganismos &aacute;cido alcohol resistentes; las muestras tambi&eacute;n deben cultivarse en medios de Lowestein-Jensen, en donde el aislamiento puede tomar hasta diez semanas usando medios s&oacute;lidos y de dos a seis semanas por m&eacute;todos radiom&eacute;tricos, los cultivos son positivos en menos de la mitad de las muestras y la identificaci&oacute;n del cultivo ser&aacute; m&aacute;s r&aacute;pida usando sondas de DNA. <SUP>88-93</SUP> Se debe realizar sensibilidad a antif&iacute;micos en todo aislamiento ya que se ha reportado que hasta 15 a 20% de los cultivos obtenidos en ni&ntilde;os infectados por VIH tienen resistencia por lo menos a un antif&iacute;mico <SUP>.88</SUP></font></p>     <p><font size="2" face="Verdana">Las manifestaciones radiogr&aacute;ficas son variables y no existe un patr&oacute;n radiol&oacute;gico patognom&oacute;nico de Tb, los principales hallazgos incluyen: infiltrado focal en la regi&oacute;n hiliar o en l&oacute;bulos superiores, infiltrados multilobares, infiltrado intersticial, cavitaci&oacute;n y adenopat&iacute;a hiliar, entre otros. <SUP>63,89-93</SUP>   Es importante mencionar que en los pacientes con cuentas bajas de CD4+, los hallazgos pueden ser escasos o nulos, debido a la pobre respuesta inflamatoria que presentan; mientras que en los pacientes con CD4 mayores de 200/mm  <SUP>3</SUP> los hallazgos radiogr&aacute;ficos son habitualmente similares a los encontrados en pacientes sin infecci&oacute;n por VIH. La adenopat&iacute;a mediastinal, que es una manifestaci&oacute;n frecuente en ni&ntilde;os (VIH positivos y negativos), tambi&eacute;n se observa en adultos co-infectados por VIH y Tb debido a la inmadurez inmunol&oacute;gica secundaria al VIH. <SUP>94,95</SUP></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Profilaxis</b></font></p>     <p><font size="2" face="Verdana">La profilaxis primaria est&aacute; indicada en pacientes VIH+ con PPD mayor de 5 mm que nunca hayan recibido tratamiento contra Tb y en pacientes expuestos recientemente a casos activos de Tb. Los esquemas de tratamiento profil&aacute;ctico est&aacute;n basados en estudios realizados en adultos; sin embargo, la Academia Americana de Pediatr&iacute;a, recomienda un esquema de 12 meses con isoniacida a 10 mg/kg/d&iacute;a (m&aacute;ximo 300 mg por dosis) o si se administra dos veces por semana la dosis es de 20-30 mg/kg, no excediendo de 900 mg/dosis. <SUP>93,94</SUP></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Los esquemas de elecci&oacute;n para profilaxis en adultos son:</font></p>     <p><font size="2" face="Verdana">1. Isoniacida 300 mg m&aacute;s piridoxina 25-50 mg por d&iacute;a durante 9-12 meses.</font></p>     <p><font size="2" face="Verdana">2. Isoniacida 900 mg m&aacute;s piridoxina 100 mg dos veces por semana por nueve meses.</font></p>     <p><font size="2" face="Verdana">3. Rifampicina 600 mg/d&iacute;a + pirazinamida 20 mg/kg/d&iacute;a por dos meses. </font></p>     <p><font size="2" face="Verdana">4. Rifampicina 600 mg/d&iacute;a por cuatro meses. <SUP>94,95</SUP></font></p>     <p><font size="2" face="Verdana">A continuaci&oacute;n se mencionan algunos estudios que avalan el uso de profilaxis contra <i>   M. tuberculosis </i>    . Los esquemas de seis meses han demostrado ser efectivos. Whalen y col.    <SUP>96</SUP> realizaron un estudio en Uganda donde administraron tres tipos de esquemas a personas con PPD+ e infecci&oacute;n por el VIH y reportaron una reducci&oacute;n del riesgo de reactivaci&oacute;n de Tb en cada uno de ellos; con isoniacida administrada por seis meses obtuvieron una reducci&oacute;n del riesgo en 70% de los pacientes, con rifampicina m&aacute;s isoniacida administradas por tres meses se obtuvo una reducci&oacute;n de 60% y con la administraci&oacute;n de isoniacida/rifampicina/pirazinamida por dos meses se redujo el riesgo en 49%. En otro estudio, la profilaxis con isoniacida por seis meses bisemanal <i>   versus </i> rifampicina + pirazinamida por dos meses, presentaron similar protecci&oacute;n contra Tb con 3.8 y 5% de eventos de Tb, respectivamente, en un seguimiento de cuatro a&ntilde;os. <SUP>97</SUP>   Pape y col.  <SUP>98</SUP> reportaron una incidencia de Tb de 7.5 por 100 personas/a&ntilde;o en aquellos que reciben placebo, comparado con 2.2 por 100 personas/a&ntilde;o en los que recibieron isoniacida 300 mg/d&iacute;a por 12 meses con un RR de 3.4. En otro ensayo la administraci&oacute;n de isoniacida 300 mg/d&iacute;a por seis meses en 647 pacientes, tuvieron una incidencia de Tb de 5.3 eventos por 100 personas/a&ntilde;o en el grupo placebo y de 2.1 en el grupo en tratamiento con un RR de 2.5.</font></p>     <p><font size="2" face="Verdana">La isoniacida administrada por seis meses reduce el riesgo de reactivaci&oacute;n por Tb en 60 a 90% en personas sin VIH. <SUP>99</SUP> En un an&aacute;lisis de <i> Cochrane library, </i> demuestra que los esquemas de isoniacida, isoniacida + rifampicina, pirazinamida + rifampicina y rifampicina + pirazinamida + isoniacida tuvieron una eficacia similar al ser aplicados como profilaxis en pacientes infectados por VIH y que ten&iacute;an reacci&oacute;n positiva a la prueba de tuberculina, con menos eventos de muertes, con un RR de 0.77 y un intervalo de confianza (IC) 95% de 0.58-1.03, menos eventos de casos de Tb con un RR de 0.24, con un IC 95% de 0.14-0.4.<SUP>100</SUP></font></p>     <p><font size="2" face="Verdana">Anteriormente, la administraci&oacute;n de esquemas de profilaxis que conten&iacute;an rifampicina estaban contraindicados si el paciente estaba recibiendo tratamiento antirretroviral que incluyera IP o inhibidores de la transcriptasa reversa no nucle&oacute;sidos (ITRNN) y se deb&iacute;a sustituir por rifabutina; <SUP>94</SUP> sin embargo, datos recientemente publicados indican que es posible la administraci&oacute;n de rifampicina en pacientes que reciben terapia antirretroviral y sus esquemas contienen ritonavir o efavirenz.</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Tratamiento</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">En pacientes adultos infectados por VIH, el tratamiento antituberculoso es similar al administrado en pacientes sanos.<SUP>101,102</SUP> Sin embargo, algunos estudios muestran mayor frecuencia de reca&iacute;das en pacientes adultos infectados por VIH que reciben s&oacute;lo seis meses de tratamiento antif&iacute;mico; <SUP>103-106</SUP> otros autores sugieren que en pacientes adultos co-infectados por VIH y Tb, la duraci&oacute;n m&iacute;nima del tratamiento sea de seis meses, pero si la respuesta cl&iacute;nica o bacteriol&oacute;gica es lenta entonces la terapia se administrar&aacute; por nueve meses o cuatro meses despu&eacute;s de que los cultivos sean negativos.<SUP>107</SUP> En s&iacute;ntesis, es importante reconocer que hay evidencia que con tratamientos en adultos contra Tb por seis meses en algunos pacientes muestran respuesta favorable, pero que la frecuencia de mala respuesta a estos esquemas y las reca&iacute;das favorecen el sugerir esquemas de al menos nueve meses en adultos. En ni&ntilde;os, el tratamiento se sugiere sea por lo menos de nueve meses <a href="/img/revistas/bmim/v61n1/n1a11t3.jpg" target="_blank">(Cuadro 3)</a>. <SUP>88,108-112</SUP></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>REFERENCIAS</b></font></p>     <!-- ref --><p><font size="2" face="Verdana">   1. Glatt AE, Chirgwin K, Landesman SH. Treatment of infectious associated with HIV. N Engl J Med 1988; 318: 1439-48.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1587958&pid=S1665-1146200400010001100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref -->  </font></p>     <!-- ref --><p><font size="2" face="Verdana">2. Bloom BR, Murray CJL. Tuberculosis: commentary on a reemergent killer. 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