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<front>
<journal-meta>
<journal-id>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762005000200035</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Infecciones en trasplante de médula ósea]]></article-title>
<article-title xml:lang="en"><![CDATA[Infections is bone marrow transplantation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villasís-Keever]]></surname>
<given-names><![CDATA[Angelina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mosqueda]]></surname>
<given-names><![CDATA[Juan Luis]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Departamento de Infectología ]]></institution>
<addr-line><![CDATA[México, D.F. ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2005</year>
</pub-date>
<volume>57</volume>
<numero>2</numero>
<fpage>381</fpage>
<lpage>386</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762005000200035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762005000200035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762005000200035&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culo especial</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Infecciones en trasplante de m&eacute;dula &oacute;sea</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Infections is bone marrow transplantation</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Angelina Villas&iacute;s&#150;Keever,* Juan Luis Mosqueda*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Infectolog&iacute;a, Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Reimpresos:</b><i>    <br>   </i><i>Dra. Angelina Villasis&#150;Keever<b>    <br>   </b>Departamento de Infectolog&iacute;a    <br>   Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n    <br>   Vasco de Quiroga No. 15, Tlalpan    <br>   14000, M&eacute;xico, D.F.</i>    <br>   Correo electr&oacute;nico: <a href="mailto:avkeever@prodigy.net.mx">avkeever@prodigy.net.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">El trasplante de c&eacute;lulas hematopoy&eacute;ticas se utiliza cada vez con mayor frecuencia como parte del tratamiento de enfermedades hematol&oacute;gicas malignas y no malignas.<sup>1</sup> Desde que se realiz&oacute; el primer trasplante con &eacute;xito, muchos aspectos del procedimiento han cambiado, incluidos el r&eacute;gimen de acondicionamiento, la fuente de c&eacute;lulas madre y las estrategias generales de manejo. Todos estos avances en el manejo de pacientes con trasplante de m&eacute;dula &oacute;sea (TMO) han disminuido la morbilidad y mortalidad del procedimiento. Ahora los pacientes sobreviven con mayor frecuencia al periodo de neutropenia despu&eacute;s del r&eacute;gimen de acondicionamiento y en consecuencia la frecuencia de complicaciones tard&iacute;as se ha incrementado. Por otro lado, el desarrollo de nuevas tecnolog&iacute;as ha permitido la realizaci&oacute;n de trasplantes de mayor riesgo, incluidos donadores no relacionados. Estos pacientes requieren tratamiento inmunosupresor intenso y tienen elevadas tasas de enfermedad injerto contra hu&eacute;sped (EIVH) grave y por lo tanto mayor riesgo de infecci&oacute;n y mayor tiempo de susceptibilidad a las mismas. De manera concomitante, la epidemiolog&iacute;a de las complicaciones infecciosas ha cambiado en presentaci&oacute;n y en los pat&oacute;genos involucrados.<sup>2</sup></font></p>     <p align="justify"><font face="verdana" size="2"> El riesgo de infecciones en receptores de TMO es resultado de una combinaci&oacute;n de diferentes factores que se modifican de acuerdo con el tipo de trasplante, al tiempo transcurrido y a la presencia de complicaciones.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>PRIMERA ETAPA (0&#150;30 D&Iacute;AS)</b></font></p>     <p align="justify"><font face="verdana" size="2">Durante los primeros treinta d&iacute;as que siguen al trasplante los procesos infecciosos est&aacute;n en relaci&oacute;n con dos factores principales:</font></p>     <p align="justify"><font face="verdana" size="2">1. La neutropenia prolongada.</font></p>     <p align="justify"><font face="verdana" size="2">2. Las mucositis secundarias al uso de agentes quimioterap&eacute;uticos utilizados y a la necesidad frecuente de accesos vasculares.</font></p>     <p align="justify"><font face="verdana" size="2">En consecuencia, los g&eacute;rmenes provenientes de la piel, cavidad oral y tracto gastrointestinal son los m&aacute;s prevalentes en esta etapa, en donde predominan las infecciones bacterianas y por <i>Candida sp.</i><sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>SEGUNDA ETAPA (30&#150;100 D&Iacute;AS)</b></font></p>     <p align="justify"><font face="verdana" size="2">El segundo periodo se caracteriza por el deterioro de la inmunidad celular. Este deterioro inmune es observado tanto en receptores de trasplante aut&oacute;logo como en alog&eacute;nico. De manera caracter&iacute;stica en esta etapa las infecciones bacterianas son menos comunes y citomegalovirus (CMV), <i>Pneumocystisjirovecii </i>y <i>Aspergillus sp. </i>se constituyen como los principales pat&oacute;genos.<sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>TERCERA ETAPA (&gt; 100 D&Iacute;AS)</b></font></p>     <p align="justify"><font face="verdana" size="2">Esta &uacute;ltima etapa se caracteriza por el deterioro persistente de la inmunidad celular y humoral, as&iacute; como la alteraci&oacute;n en el funcionamiento del sistema reticuloendotelial. Este deterioro es m&aacute;s grave en receptores de trasplante alog&eacute;nico y condiciona un riesgo elevado de infecciones como CMV, varicela zoster, virus Epstein&#150;Barr, virus respiratorios y organismos encapsulados <i>(S. pneumoniae </i>y <i>Haemophilus influenza&eacute;), </i>entre los m&aacute;s frecuentes.<sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2">Actualmente y como consecuencia del mejor conocimiento de las complicaciones infecciosas del trasplante se utiliza de manera generalizada profilaxis con aciclovir, fluconazol y trimetoprim/sulfametoxazol, con lo cual ha disminuido la frecuencia y gravedad de infecciones por herpes simple, <i>Candida </i>y <i>P. jirovecii; </i>por otro lado, el uso de ganciclovir como profilaxis o tratamiento anticipado han tenido un efecto similar en la frecuencia de enfermedad por citomegalovirus en el periodo temprano despu&eacute;s del trasplante.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">A pesar de todos estos avances en la profilaxis y prevenci&oacute;n de las infecciones de los receptores de trasplante de c&eacute;lulas hematopoy&eacute;ticas, las complicaciones infecciosas contin&uacute;an siendo una causa importante de morbilidad y mortalidad. La evaluaci&oacute;n y manejo adecuado de estos pacientes requiere del conocimiento de los m&uacute;ltiples factores que influyen en la etiolog&iacute;a, manifestaciones y gravedad de los procesos infecciosos; y que se modifican continuamente con el avance en los procedimientos del trasplante.</font></p>     <p align="justify"><font face="verdana" size="2">El objetivo en el r&eacute;gimen de acondicionamiento es suprimir las c&eacute;lulas T del receptor del trasplante, que podr&iacute;an mediar el rechazo del injerto. Para esto, los reg&iacute;menes convencionales han sido altamente mieloablativos con el uso de radiaci&oacute;n corporal total y dosis altas de quimioterapia. Como consecuencia, los pacientes presentan neutropenia grave y prolongada adem&aacute;s de toxicidad en diferentes &oacute;rganos, lo cual contribuye a las complicaciones infecciosas que se observan en fases tempranas. Recientemente se han desarrollado diferentes reg&iacute;menes de acondicionamiento no mieloablativos, con menor toxicidad; estos reg&iacute;menes se asocian con menor frecuencia de mucositis y menor duraci&oacute;n de la neutropenia, con una menor mortalidad temprana relacionada con el trasplante. El &eacute;xito de esta estrategia se basa en el potencial terap&eacute;utico de los efectos de la enfermedad injerto contra hu&eacute;sped. El uso de reg&iacute;menes no mieloablativos parecen asociarse con una menor frecuencia de infecciones bacterianas y por <i>Candida </i>en la etapa temprana.</font></p>     <p align="justify"><font face="verdana" size="2">Con el uso de c&eacute;lulas de sangre perif&eacute;rica en lugar de m&eacute;dula &oacute;sea como fuente de c&eacute;lulas madre se ha logrado disminuir la duraci&oacute;n del periodo de neutropenia que se presenta despu&eacute;s del r&eacute;gimen condicionante. Con frecuencia las c&eacute;lulas se manipulan <i>ex vivo </i>para disminuir la cantidad de c&eacute;lulas T, disminuyendo as&iacute; el riesgo de EIVH o se seleccionan precursores espec&iacute;ficos como CD34 + con lo cual se disminuye la incidencia de reca&iacute;da de la enfermedad neopl&aacute;sica. Sin embargo, la depleci&oacute;n de c&eacute;lulas T tiene impacto en la reconstituci&oacute;n inmune e incrementa el riesgo de infecci&oacute;n.<sup>5</sup></font></p>     <p align="justify"><font face="verdana" size="2">El uso de c&eacute;lulas madre de cord&oacute;n umbilical se asocia a recuperaci&oacute;n tard&iacute;a de la hematopoyesis que junto con la disfunci&oacute;n de los neutr&oacute;filos se traduce en mayor riesgo de infecci&oacute;n, principalmente en etapas tempranas.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2">En estos pacientes se han reportado mayor riesgo de aspergilosis, candidiasis, infecciones por adenovirus y herpes virus humano&#150;6.<sup>7,</sup><sup>8</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por otro lado, las tasas de EIVH son menores, aun en pacientes que reciben trasplante de cord&oacute;n de donadores no relacionados, lo cual puede proteger para infecci&oacute;n en etapas tard&iacute;as.<sup>9</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>INFECCIONES VIRALES</b></font></p>     <p align="justify"><font face="verdana" size="2">La mayor parte de los virus que afectan al hombre pueden causar enfermedad grave en pacientes inmunocomprometidos. La prevenci&oacute;n de estas enfermedades incluye la evaluaci&oacute;n del riesgo de acuerdo con factores virales y del hu&eacute;sped y con el tiempo de trasplante.</font></p>     <p align="justify"><font face="verdana" size="2">Las infecciones virales end&oacute;genas como los herpes&#150;virus se caracterizan por la reactivaci&oacute;n del estado de latencia, lo cual ocurre t&iacute;picamente durante los periodos de m&aacute;xima supresi&oacute;n de c&eacute;lulas T, como en receptores de trasplante repletado de c&eacute;lulas T y durante el tratamiento de EIVH.</font></p>     <p align="justify"><font face="verdana" size="2">Las infecciones por virus comunitarios o epis&oacute;dicos como virus sincicial respiratorio o parainfluenza se determina principalmente por la exposici&oacute;n. El nivel de inmunosupresi&oacute;n determina la gravedad de la enfermedad. Los trasplantes de donadores no relacionados y/o el uso de dosis elevadas de esteroides para tratamiento de EIVH se asocian a mayor frecuencia de enfermedad grave, neumon&iacute;a, diseminaci&oacute;n de la enfermedad asociada a infecciones por virus respiratorios adquiridos en la comunidad y adenovirus.<sup>10</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Citomegalovirus</b></font></p>     <p align="justify"><font face="verdana" size="2">Las infecciones por CMV tienen una elevada morbimortalidad en pacientes con TMO. Los pacientes de mayor riesgo son quienes son seropositivos antes del trasplante, aproximadamente 70% de ellos tienen reactivaci&oacute;n de la infecci&oacute;n, y sin tratamiento de 35 a 50% desarrollan enfermedad. Otras caracter&iacute;sticas del trasplante influyen en el riesgo de desarrollar la enfermedad. Los pacientes CMV+ que reciben injerto con depleci&oacute;n de c&eacute;lulas T o selecci&oacute;n de c&eacute;lulas CD34+, tienen un riesgo particularmente alto de desarrollar enfermedad, la cual puede ocurrir incluso antes de la recuperaci&oacute;n hematol&oacute;gica.<sup>11,12</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por otro lado, en los receptores de trasplante no mieloablativo la incidencia no es diferente, pero en ellos la presentaci&oacute;n es tard&iacute;a.<sup>13</sup></font></p>     <p align="justify"><font face="verdana" size="2">La manifestaci&oacute;n m&aacute;s com&uacute;n de enfermedad por CMV es neumonitis intersticial, la que se presenta de manera caracter&iacute;stica dentro de los primeros 100 d&iacute;as despu&eacute;s al trasplante.<sup>14</sup> Otras manifestaciones menos comunes incluyen enteritis, coriorretinitis, fiebre y hepatitis. Sin tratamiento, la neumon&iacute;a por CMV alcanza una mortalidad de 80 a 90%, el tratamiento con ganciclovir ha permitido tasas de sobrevida de hasta 45% a 90 d&iacute;as despu&eacute;s del evento y de hasta 85% con tratamiento antiviral y dosis altas de inmunoglobulina.<sup>15,16</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se han logrado importantes avances en la prevenci&oacute;n de esta enfermedad.<sup>17</sup> Las estrategias de prevenci&oacute;n incluyen el uso de profilaxis universal que es muy efectiva, pero que conduce al uso innecesario de ganciclovir en hasta 65% de los casos con las consiguientes desventajas de costo y toxicidad principalmente a nivel de m&eacute;dula &oacute;sea.<sup>3,18,19</sup> La mayor parte de los centros utilizan actualmente tratamiento anticipado para prevenci&oacute;n de enfermedad por CMV en el periodo temprano despu&eacute;s del trasplante. Este abordaje consiste en la administraci&oacute;n de tratamiento s&oacute;lo cuando se documenta que existe reactivaci&oacute;n de la infecci&oacute;n mediante el uso de determinaciones seriadas en muestras de sangre utilizando ensayos con elevada sensibilidad como antigenemia o PCR para DNA de CMV. El uso de tratamiento anticipado ha disminuido la enfermedad por CMV a menos de 5% en los pacientes con mayor riesgo en los primeros 100 d&iacute;as del trasplante.<sup>20</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Es por ello que actualmente la enfermedad por CMV ocurre con mayor frecuencia despu&eacute;s del d&iacute;a 100.<sup>18</sup> Los pacientes con reactivaci&oacute;n por CMV antes del d&iacute;a 100 y quienes recibieron esteroides para EIVH son quienes tienen el mayor riesgo de desarrollar enfermedad por CMV (aproximadamente</font></p>     <p align="justify"><font face="verdana" size="2">El tipo de inmunosupresi&oacute;n que se utilice despu&eacute;s del trasplante parece determinar e incluso limitar la eficacia del uso de tratamiento anticipado como terapia preventiva para enfermedad por CMV. Los pacientes que reciben altas dosis de esteroides tienen pobre respuestas virol&oacute;gicas al tratamiento anticipado, manifestado por incremento de la carga viral despu&eacute;s del uso de ganciclovir o foscarnet. En pacientes que no han recibido previamente ganciclovir, el incremento de la carga viral en fases tempranas despu&eacute;s del trasplante refleja una pobre respuesta virol&oacute;gica, m&aacute;s que resistencia a ganciclovir, por lo que se recomienda el uso de dosis mayores de antivirales y no cambio del mismo (reiniciar o continuar con la dosis de inducci&oacute;n).<sup>22</sup></font></p>     <p align="justify"><font face="verdana" size="2">Valganciclovir es una pro&#150;droga del ganciclovir, que administrado por VO obtiene niveles plasm&aacute;ticos semejantes a los que se alcanzan con el uso de ganciclovir intravenoso. Se ha utilizado valganciclovir en estudios cl&iacute;nicos que incluyen un n&uacute;mero reducido de pacientes con EIVH sin afecci&oacute;n intestinal en donde se ha observado una buena respuesta virol&oacute;gica. Sin embargo, debido a que contamos con informaci&oacute;n limitada acerca de la farcamocin&eacute;tica y la eficacia de la droga en pacientes con TMO, hay grupos que prefieren utilizar ganciclovir intravenoso como tratamiento de inducci&oacute;n en pacientes con reactivaci&oacute;n o enfermedad, sobre todo si tienen niveles elevados de inmunosupresi&oacute;n o evidencia de EIVH gastrointestinal.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Epstein Barr</b></font></p>     <p align="justify"><font face="verdana" size="2">Es frecuente la reactivaci&oacute;n de virus Epstein Barr virus (EBV) en pacientes con TMO alog&eacute;nico, pero es generalmente asintom&aacute;tico. La principal complicaci&oacute;n de la infecci&oacute;n por VEB es la presencia de enfermedad linfoproliferativa postrasplante (ELPT). La ELPT asociada al VEB es una enfermedad rara, consecuencia de una proliferaci&oacute;n descontrolada de c&eacute;lulas B por deterioro en la respuesta de linfocitos T que sigue al TMO.<sup>23</sup> La ELPT incluye un amplio espectro de enfermedades que van desde hiperplasia de linfocitos B polim&oacute;rficos hasta linfomas inmunobl&aacute;sticos de c&eacute;lulas B, el cual se asocia con una elevada mortalidad.</font></p>     <p align="justify"><font face="verdana" size="2">Los factores de riesgo incluyen trasplante de donador no relacionado, depleci&oacute;n de c&eacute;lulas T e infecci&oacute;n primaria por VEB.<sup>24</sup></font></p>     <p align="justify"><font face="verdana" size="2">La incidencia acumulada de ELPT en pacientes con TMO es de 1% en 10 a&ntilde;os, es muy rara en pacientes que recibieron autotrasplante, pero se ha reportado hasta en 10% de ni&ntilde;os que reciben trasplantes aut&oacute;logos con selecci&oacute;n de CD34 + y mayor a 20% entre pacientes que reciben trasplante aut&oacute;logo con m&eacute;dula &oacute;sea depletada de c&eacute;lulas T.<sup>23,25</sup></font></p>     <p align="justify"><font face="verdana" size="2">Hasta el momento no existe una estrategia de prevenci&oacute;n<sup>3,23</sup> ni tratamiento espec&iacute;fico. En los pacientes con riesgo elevado se recomienda tener un seguimiento estrecho mediante el uso de PCR para DNA VEB y considerar el uso de tratamiento anticipado con rituximab. Rituximab es un anticuerpo monoclonal quim&eacute;rico, humanizado se une al ant&iacute;geno CD20+ de las c&eacute;lulas B ocasionando citotoxicidad dependiente de anticuerpos y complemento. Rituximab puede disminuir la carga viral de VEB a trav&eacute;s de depleci&oacute;n de c&eacute;lulas B.<sup>26</sup></font></p>     <p align="justify"><font face="verdana" size="2">En presencia de ELPT se debe considerar disminuir la inmunosupresi&oacute;n. En casos de enfermedad localizada se puede curar la enfermedad con tratamiento quir&uacute;rgico o con disminuci&oacute;n de la inmunosupresi&oacute;n cuando es posible. El uso de quimioterapia, radioterapia, interfer&oacute;n a, inmunoglobulina intravenosa y terapia antiviral han s&oacute;lo mostrado resultados limitados en sobrevida, lo que ha impulsado el inter&eacute;s en el papel de la inmunoterapia.<sup>23</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se han utilizado anticuerpos monoclonales antic&eacute;lulas B (rituximab) en el manejo de estos procesos linfoproliferativos de c&eacute;lulas B que expresan ant&iacute;geno CD20+ con diversos reportes de tratamiento seguro y eficaz en casos de ELPT grave.<sup>27&#150;</sup><sup>29</sup></font></p>     <p align="justify"><font face="verdana" size="2">La interleucina 6 (IL&#150;6) es un factor de crecimiento para proliferaci&oacute;n de c&eacute;lulas B inducida por VEB.<sup>23,30</sup> Haddad, <i>et. al.</i><sup>31</sup> publicaron los resultados de un estudio para el manejo de ELPT con anticuerpo monoclonal anti&#150;IL&#150;6 observando remisi&oacute;n completa en cinco, parcial en tres, enfermedad estable en uno y progresi&oacute;n de la enfermedad en tres pacientes.</font></p>     <p align="justify"><font face="verdana" size="2">Se ha mostrado regresi&oacute;n de la ELPT con el uso de infusi&oacute;n de linfocitos T citot&oacute;xicos espec&iacute;ficos (inmunoterapia adoptiva).<sup>32,33</sup> Su uso como tratamiento anticipado guiado por carga viral puede no detectar casos de enfermedad localizada,<sup>34</sup> por esta raz&oacute;n se ha sugerido el uso de "profilaxis dirigida" con la infusi&oacute;n de linfocitos T en pacientes de alto riesgo como son los receptores de trasplantes depletados de c&eacute;lulas T.<sup>35</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Adenovirus</b></font></p>     <p align="justify"><font face="verdana" size="2">En receptores de TMO la infecci&oacute;n por adenovirus se puede manifestar como infecciones de tracto respiratorio superior, gastroenteritis, cistitis hemorr&aacute;gica, hepatitis grave, meningoencefalitis o neumon&iacute;a. La incidencia de infecciones graves puede aumentar por el uso de anticuerpos anti&#150;CD52 y fludarabina. Los factores de riesgo para infecciones graves incluyen edad joven, trasplante alog&eacute;nico, el uso de radiaci&oacute;n corporal total como parte del r&eacute;gimen condicionante y aislamiento de adenovirus de m&aacute;s de un sitio anat&oacute;mico como heces, orina o secreciones respiratorias. Es dif&iacute;cil el diagn&oacute;stico de infecci&oacute;n por adenovirus, el aislamiento en cultivo es lento; mediante la determinaci&oacute;n de ant&iacute;genos se logra un resultado r&aacute;pido, pero el valor predictivo negativo para enfermedad invasiva es bajo. El uso de PCR en suero est&aacute; en desarrollo y puede servir en un futuro para guiar el uso de tratamiento anticipado en pacientes con riesgo elevado.<sup>36,37</sup></font></p>     <p align="justify"><font face="verdana" size="2">No existen estudios controlados para el tratamiento de infecciones por adenovirus. La disminuci&oacute;n en la inmunosupresi&oacute;n parece ser efectiva en algunos casos y debe considerarse siempre que sea posible.<sup>38</sup></font></p>     <p align="justify"><font face="verdana" size="2">Existen reportes de casos y series de casos con el uso de ribavirina, cidofovir e inmunoterapia con c&eacute;lulas T.</font></p>     <p align="justify"><font face="verdana" size="2">Cidofovir parece ser el que tiene mejor actividad, pero su uso se limita por la toxicidad renal y a m&eacute;dula &oacute;sea.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>INFECCIONES INVASIVAS POR HONGOS</b></font></p>     <p align="justify"><font face="verdana" size="2">Las infecciones invasivas por hongos constituyen la principal causa de mortalidad por infecci&oacute;n posterior al TMO. El principal factor de riesgo para el desarrollo de infecciones invasivas por hongos es la neutropenia, la gravedad y la duraci&oacute;n de la misma. Otros factores incluyen la alteraci&oacute;n de las barreras mucosas y el uso de antibi&oacute;ticos de amplio espectro.<sup>39,40</sup> Las especies de <i>Candida </i>son los microorganismos que con mayor frecuencia causan enfermedad invasiva en etapas tempranas despu&eacute;s del trasplante.</font></p>     <p align="justify"><font face="verdana" size="2">El uso generalizado de fluconazol en pacientes que reciben trasplante alog&eacute;nico de MO ha disminuido la incidencia de candidemia y la mortalidad asociada a infecciones por <i>Candida </i>en las fases tempranas despu&eacute;s del trasplante.<sup>41</sup></font></p>     <p align="justify"><font face="verdana" size="2">Existe una menor incidencia de candidiasis temprana por especies susceptibles a azoles (C. <i>albicans </i>y <i>C. tropicalis) </i>y un incremento en las infecciones por <i>Candida sp. </i>resistente a fluconazol, como <i>C. glabrata </i>y <i>C. krusei, </i>as&iacute; como en la frecuencia de infecciones por hongos filamentosos. Actualmente las infecciones m&aacute;s frecuentes por hongos son causadas por <i>Aspergillus fumigatus. </i>Se ha descrito una incidencia acumulada en un a&ntilde;o de aspergilosis invasiva documentada mayor a 10% en receptores de trasplante alog&eacute;nico.<sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2">Adem&aacute;s, la presentaci&oacute;n de esta infecci&oacute;n ha cambiado, la mayor parte de las infecciones invasivas ocurren ahora en periodos tard&iacute;os cuando existen otros factores de riesgo incluyendo la presencia de EIVH, el uso de esteroides para tratarla y la presencia de otras infecciones virales como CMV. El uso de reg&iacute;menes no mieloablativos que se asocian a una menor incidencia y duraci&oacute;n de neutropenia, pero con mayor frecuencia de EIVH, tienen tasas similares de aspergilosis invasiva.</font></p>     <p align="justify"><font face="verdana" size="2">Por otro lado, se han incrementado las infecciones invasivas causadas por zigomicetos y <i>Fusarium sp., </i>particularmente en pacientes que reciben trasplantes de un donador no relacionado o con incompatibidad HLA y los pacientes con EIVH grave.<sup>4,42</sup></font></p>     <p align="justify"><font face="verdana" size="2">El tratamiento para infecciones invasivas por hongos es a&uacute;n controversial. La disponibilidad de voriconazol y de intraconazol intravenoso ha ampliado las opciones terap&eacute;uticas, aun cuando estos medicamentos tienen el mismo blanco, ergosterol en la membrana plasm&aacute;tica. Voriconazol ha mostrado ser m&aacute;s efectivo que anfotericina B para manejo de aspergilosis invasiva, sin embargo, la respuesta a voriconazol en pacientes con TMO es menor que en pacientes con una neoplasia hematol&oacute;gica (32 <i>vs. </i>63%).<sup>43</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las equinocandinas tienen un nuevo mecanismo de acci&oacute;n, la beta&#150;1,3 glucano sintetaza, enzima que produce un componente importante en la pared celular del hongo. Es por ello que actualmente se ha considerado el uso de tratamiento antif&uacute;ngico combinado. La combinaci&oacute;n de anfotericina B y caspofungina o voriconazol y caspofungina tienen actividad aditiva o sinergista <i>in vitro vs. Aspergillus sp. </i>En modelos animales de aspergilosis invasiva el uso de voriconazol y caspofungina se asoci&oacute; a tasas mayores de esterilizaci&oacute;n de tejido en comparaci&oacute;n con cualquiera de los agentes solos o con anfotericina B. Por otro lado, los resultados de estudios cl&iacute;nicos no controlados y con un n&uacute;mero reducido de pacientes sugieren que el tratamiento combinado puede ser superior a la monoterapia para el tratamiento de aspergilosis invasiva.<sup>44</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>     ]]></body>
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