<?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>0864-0289</journal-id>
<journal-title><![CDATA[Revista Cubana de Hematología, Inmunología y Hemoterapia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Hematol Inmunol Hemoter]]></abbrev-journal-title>
<issn>0864-0289</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-02892010000300001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Hemofilia A adquirida]]></article-title>
<article-title xml:lang="en"><![CDATA[Acquired hemophilia A]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almagro Vázquez]]></surname>
<given-names><![CDATA[Delfina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto de Hematología e Inmunología  ]]></institution>
<addr-line><![CDATA[Ciudad de La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<volume>26</volume>
<numero>3</numero>
<fpage>174</fpage>
<lpage>185</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-02892010000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-02892010000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-02892010000300001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La hemofilia A adquirida (HAA) es un trastorno hemorrágico poco frecuente caracterizado por la presencia de autoanticuerpos contra el factor VIII (FVIII) circulante. Aproximadamente en la mitad de los casos se ha observado un grupo heterogéneo de procesos patológicos que incluyen, entre otros, enfermedades autoinmunes y malignas y durante el embarazo, parto y puerperio. Las manifestaciones hemorrágicas son variables y fundamentalmente de tipo cutáneo mucoso. El diagnóstico se basa en el hallazgo en un paciente con manifestaciones hemorrágicas, prolongación del tiempo parcial de tromboplastina activado (TPTA), disminución de la actividad del FVIII y presencia de inhibidores del FVIII. El tratamiento de HAA incluye el control de las manifestaciones hemorrágicas y la supresión de la producción del anticuerpo. El concentrado de factor VIIa recombinante (FVIIar) y el concentrado de complejo protrombínico (CCPA) se consideran el tratamiento antihemorrágico de primera línea. Como terapéutica alternativa, en algunos casos puede utilizarse el concentrado de FVIII, la plasmaféresis y la inmunoadsorción extracorpórea. La prednisona sola o asociada con la ciclofosfamida, constituye el tratamiento inmunosupresor de primera línea. En pacientes refractarios puede administrarse como terapéutica de segunda línea, el rituximab (anti-CD20). Con la azatiopina, la ciclosporina, la vincristina y el micofenolato de mofetil, se han obtenido resultados variables.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Acquired hemophilia A (AHA) is an uncommon hemorrhagic disorder characterized by presence of autoantibodies to circulating factor VIII. Approximately in half of cases it is noted a heterogeneous group of pathological processes including among others, autoimmune and malignant diseases and during pregnancy, labor and puerperium. Hemorrhagic manifestations are variable and mainly of mucous cutaneous type. Diagnosis is based on the finding of a patient presenting with hemorrhagic manifestations, extension of activated partial thromboplastin time (APTT), decrease of Factor VIII activity, and presence of Factor VIII inhibitors. AHA treatment includes the control of hemorrhagic manifestations and the suppression of antibody production. The recombinant factor VIIIa (rVIIIaF) concentration and the prothrombin-complex concentrations (PCC) are considered like the first-line antihemorrhagic treatment. As alternative therapy in some cases the FCIII concentration, the plasmapheresis and extracorporeal immuno-adsorption may be used. The prednisone alone or associated with cyclophosphamide is the firs-line immunosuppressive treatment. In refractory patients it may be administered as a second-line therapy, the Rituximab (anti-CD20). With the use of Azathioprine, Cyclosporine, Vincristine and the Mycophenolate mofetil variable results have been achieved.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hemofilia A adquirida]]></kwd>
<kwd lng="es"><![CDATA[autoanticuerpos contra el factor VIII]]></kwd>
<kwd lng="es"><![CDATA[corticosteroides]]></kwd>
<kwd lng="es"><![CDATA[ciclofosfamida]]></kwd>
<kwd lng="es"><![CDATA[rituximab]]></kwd>
<kwd lng="en"><![CDATA[Acquired hemophilia A]]></kwd>
<kwd lng="en"><![CDATA[autoantibodies to factor VIII]]></kwd>
<kwd lng="en"><![CDATA[corticosteroids]]></kwd>
<kwd lng="en"><![CDATA[Cyclophosphamide]]></kwd>
<kwd lng="en"><![CDATA[Rituximab]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="Verdana" size="2"> </font>  <font face="Verdana" size="2"><B>     <div align="right">ART&Iacute;CULOS DE REVISI&Oacute;N</div> </B></font>    <p></p>    <P>      <P>     <P><b><font face="Verdana" size="2"> <font size="4">Hemofilia A adquirida </font></font></b>     <P>      <P>     <P>      <P><font size="3"><b><font face="Verdana">Acquired hemophilia A </font></b></font>     ]]></body>
<body><![CDATA[<P>     <P>      <P>     <P>     <P>     <P>      <P>      <P><b><font face="Verdana" size="2">DraC. Delfina Almagro V&aacute;zquez</font></b>     <P>      <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Instituto de Hematolog&iacute;a e Inmunolog&iacute;a.    Ciudad de La Habana, Cuba. </font>     <P>     <P>      <P>     <P> <hr size="1" noshade>     <P>      <P><font face="Verdana" size="2"><B>RESUMEN</B></font>     <P>      <P><font face="Verdana" size="2">La hemofilia A adquirida (HAA) es un trastorno    hemorr&aacute;gico poco frecuente caracterizado por la presencia de autoanticuerpos    contra el factor VIII (FVIII) circulante. Aproximadamente en la mitad de los    casos se ha observado un grupo heterog&eacute;neo de procesos patol&oacute;gicos    que incluyen, entre otros, enfermedades autoinmunes y malignas y durante el    embarazo, parto y puerperio. Las manifestaciones hemorr&aacute;gicas son variables    y fundamentalmente de tipo cut&aacute;neo mucoso. El diagn&oacute;stico se basa    en el hallazgo en un paciente con manifestaciones hemorr&aacute;gicas, prolongaci&oacute;n    del tiempo parcial de tromboplastina activado (TPTA), disminuci&oacute;n de    la actividad del FVIII y presencia de inhibidores del FVIII. El tratamiento    de HAA incluye el control de las manifestaciones hemorr&aacute;gicas y la supresi&oacute;n    de la producci&oacute;n del anticuerpo. El concentrado de factor VIIa recombinante    (FVIIar) y el concentrado de complejo protromb&iacute;nico (CCPA) se consideran    el tratamiento antihemorr&aacute;gico de primera l&iacute;nea. Como terap&eacute;utica    alternativa, en algunos casos puede utilizarse el concentrado de FVIII, la plasmaf&eacute;resis    y la inmunoadsorci&oacute;n extracorp&oacute;rea. La prednisona sola o asociada    con la ciclofosfamida, constituye el tratamiento inmunosupresor de primera l&iacute;nea.    En pacientes refractarios puede administrarse como terap&eacute;utica de segunda    l&iacute;nea, el rituximab (anti-CD20). Con la azatiopina, la ciclosporina,    la vincristina y el micofenolato de mofetil, se han obtenido resultados variables.    </font>     <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2"><I>Palabras clave</I>: hemofilia A adquirida,    autoanticuerpos contra el factor VIII, corticosteroides, ciclofosfamida, rituximab.    </font> <hr size="1" noshade>     <P>      <P>      <P><font face="Verdana" size="2"><B>ABSTRACT</B></font>     <P>      <P><font face="Verdana" size="2">Acquired hemophilia A (AHA) is an uncommon hemorrhagic    disorder characterized by presence of autoantibodies to circulating factor VIII.    Approximately in half of cases it is noted a heterogeneous group of pathological    processes including among others, autoimmune and malignant diseases and during    pregnancy, labor and puerperium. Hemorrhagic manifestations are variable and    mainly of mucous cutaneous type. Diagnosis is based on the finding of a patient    presenting with hemorrhagic manifestations, extension of activated partial thromboplastin    time (APTT), decrease of Factor VIII activity, and presence of Factor VIII inhibitors.    AHA treatment includes the control of hemorrhagic manifestations and the suppression    of antibody production. The recombinant factor VIIIa (rVIIIaF) concentration    and the prothrombin-complex concentrations (PCC) are considered like the first-line    antihemorrhagic treatment. As alternative therapy in some cases the FCIII concentration,    the plasmapheresis and extracorporeal immuno-adsorption may be used. The prednisone    alone or associated with cyclophosphamide is the firs-line immunosuppressive    treatment. In refractory patients it may be administered as a second-line therapy,    the Rituximab (anti-CD20). With the use of Azathioprine, Cyclosporine, Vincristine    and the Mycophenolate mofetil variable results have been achieved. </font>     <P>      <P><font face="Verdana" size="2"><I>Key words</I>: Acquired hemophilia A, autoantibodies    to factor VIII, corticosteroids, Cyclophosphamide, Rituximab.</font> <hr size="1" noshade>     <p></p>    <P>     ]]></body>
<body><![CDATA[<P>      <P>      <P>      <P>      <P><font face="Verdana" size="3"><B>INTRODUCCI&Oacute;N</B></font>     <P>      <P><font face="Verdana" size="2">La hemofilia A adquirida (HAA) es un trastorno    hemorr&aacute;gico poco frecuente caracterizado por la presencia de autoanticuerpos    contra el factor VIII (FVIII) circulante. Se ha comunicado una incidencia de    alrededor de 1,5 casos por mill&oacute;n por a&ntilde;o.<SUP>1,2</SUP> Se presenta    con mayor frecuencia en &eacute;pocas tard&iacute;as de la vida,<SUP>3</SUP>    con un peque&ntilde;o aumento en mujeres entre 20 y 30 a&ntilde;os, asociado    con el embarazo, posparto y enfermedades autoinmunes.<SUP>4</SUP> Aproximadamente    en la mitad de los casos aparece espont&aacute;neamente en individuos sin historia    anterior de trastornos hemorr&aacute;gicos.<SUP>5</SUP> </font>     <P><font face="Verdana" size="2"><I>Pavlova</I> y otros han sugerido que    estos autoanticuerpos se desarrollan como consecuencia de una interacci&oacute;n    compleja de factores gen&eacute;ticos y ambientales, hasta ahora poco conocidos,    que provocan un trastorno de la regulaci&oacute;n inmune.<SUP>6</SUP> Estos    autores demostraron que el polimorfismo del ant&iacute;geno 4 de los linfocitos    T citot&oacute;xicos es uno de los m&uacute;ltiples factores gen&eacute;ticos    que contribuyen a la aparici&oacute;n de estos autoanticuerpos y que participan    tambi&eacute;n en la modulaci&oacute;n de la respuesta autoinmune y en el mantenimiento    de la tolerancia perif&eacute;rica. </font>     <P><font face="Verdana" size="2">Los autoanticuerpos contra el FVIII son heterog&eacute;neos,    particularmente la inmunoglobulina G (IgG), y dependientes de tiempo y temperatura.<SUP>7</SUP> La cin&eacute;tica de la interacci&oacute;n entre el FVIII y este    tipo de inhibidor difiere del comportamiento de los aloanticuerpos desarrollados    en algunos pacientes con hemofilia hereditaria, ya que muestran una cin&eacute;tica    compleja y exponencial que corresponde a un patr&oacute;n de inactivaci&oacute;n    tipo 2 con una inhibici&oacute;n incompleta del factor y la presencia de actividad    de FVIII residual en el plasma.<SUP>8</SUP> </font>     <P>    ]]></body>
<body><![CDATA[<br>     <P>      <P>      <P><font face="Verdana" size="3"><B>CAUSAS DE LA HEMOFILIA A ADQUIRIDA</B> </font>     <P>      <P><font face="Verdana" size="2">Se ha observado que alrededor de la mitad de    los pacientes con HAA presentan un grupo heterog&eacute;neo de procesos patol&oacute;gicos    que incluyen, entre otros, enfermedades autoinmunes y malignas, embarazo, parto    y puerperio.<SUP>9-11 </SUP>(<a href="#t1">Tabla 1</a>).</font>      <P align="center"><a name="t1"></a><img src="/img/revistas/hih/v26n3/t0101310.gif" width="405" height="374" border="0">     
<P><font face="Verdana" size="2">Entre los primeros se encuentran el lupus eritematoso    sist&eacute;mico (LES), la artritis reumatoidea, el s&iacute;ndrome de Sj&ouml;gren,    la miastenia gravis, la esclerosis m&uacute;ltiple y la colitis ulcerativa.<SUP>12</SUP> </font>     <P><font face="Verdana" size="2">Dentro de las enfermedades hematol&oacute;gicas    malignas los autoanticuerpos contra el FVIII se han presentado en el linfoma    no Hodgkin, la leucemia linfoc&iacute;tica cr&oacute;nica, el mieloma m&uacute;ltiple,    la macroglobulinemia de Waldenstr&ouml;m, la mielofibrosis y los s&iacute;ndromes    mielodispl&aacute;sticos.<SUP>13</SUP> </font>     <P><font face="Verdana" size="2">Los tumores s&oacute;lidos en los que con mayor    frecuencia se ha observado la HAA son: carcinoma de pr&oacute;stata, mama, pulm&oacute;n,    est&oacute;mago, p&aacute;ncreas, colon, cabeza, cuello y ri&ntilde;&oacute;n.    Aunque la desaparici&oacute;n del inhibidor parece estar relacionada con la    evoluci&oacute;n satisfactoria del tumor, su reaparici&oacute;n no se considera    un marcador adecuado de la recurrencia del proceso maligno.<SUP>14</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Los inhibidores del FVIII se han encontrado tambi&eacute;n    en algunos procesos al&eacute;rgicos como el asma, y en reacciones medicamentosas,    en particular a las sulfonamidas; y con menor frecuencia, a la penicilina, fenito&iacute;na,<B>    </B>cloranfenicol, metildopa y alfa-interfer&oacute;n, as&iacute; como en enfermedades    dermatol&oacute;gicas tales como el p&eacute;nfigo, la psoriasis y despu&eacute;s    de la administraci&oacute;n de vacunas.<SUP>12</SUP> </font>      <P><font face="Verdana" size="2">La llamada HAA <I>post partum</I> es una complicaci&oacute;n    poco frecuente, pero habitualmente grave, asociada con el embarazo, parto y    puerperio. En la mayor&iacute;a de los casos se presenta en mujeres primigr&aacute;vidas.    </font>     <P><font face="Verdana" size="2">Aunque las manifestaciones hemorr&aacute;gicas    pueden aparecer hasta 2 meses despu&eacute;s del parto, con mayor frecuencia    ocurren sangramientos severos durante el trabajo de parto, parto y puerperio    inmediato, que en ocasiones requieren histerectom&iacute;a, por lo que deben    ser tratadas de manera inmediata.<SUP>15,16</SUP> </font>     <P><font face="Verdana" size="2">El inhibidor de FVIII <I>post partum</I> tiene    la tendencia a desaparecer espont&aacute;neamente en un n&uacute;mero importante    de casos en el curso de meses, es de buen pron&oacute;stico y la mortalidad    es baja comparado con otras causas de HAA.<SUP>12,17,18</SUP> </font>     <P><font face="Verdana" size="2">La recurrencia del inhibidor en ulteriores embarazos    es raramente observada;<SUP>19,20</SUP> su ocurrencia podr&iacute;a provocar    sangramiento fetal importante por la transferencia trasplacentaria del autoanticuerpo.    </font>     <P><font face="Verdana" size="2">Es necesario se&ntilde;alar que ante la presencia    de una hemorragia posparto en que no se halle una causa obst&eacute;trica, debe    investigarse la presencia de una HAA. </font>     <P><font face="Verdana" size="2">Se ha observado que en los inhibidores del FVIII    <I>post partum</I> los corticosteroides tienen mayor eficacia en la erradicaci&oacute;n    del autoanticuerpo que en el resto de los procesos etiol&oacute;gicos con esta    complicaci&oacute;n. </font>     <P><font face="Verdana" size="2">El manejo de los episodios hemorr&aacute;gicos    es similar, como se ver&aacute; m&aacute;s adelante.<SUP>21,22</SUP></font>     <P>    <br>     ]]></body>
<body><![CDATA[<P>      <P>      <P><font face="Verdana" size="3"><B>MANIFESTACIONES CL&Iacute;NICAS</B> </font>     <P>      <P><font face="Verdana" size="2">Las manifestaciones hemorr&aacute;gicas en la    HAA son variables y se presentan en individuos sin historia previa de coagulopat&iacute;a:<SUP>3</SUP> </font>     <P><font face="Verdana" size="2"><I>Sangramientos cut&aacute;neo-mucosos.</I>    </font>     <P><font face="Verdana" size="2"> - Equ&iacute;mosis.    <br>   </font><font face="Verdana" size="2">- Ep&iacute;staxis.     <br>   </font><font face="Verdana" size="2">- Menorragia. </font>     <P> <font face="Verdana" size="2"><I>Hematuria. </I></font><I>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Sangramiento gastrointestinal. </font>     <P><font face="Verdana" size="2">Sangramientos infrecuentes.</font> </I>      <P><font face="Verdana" size="2"> - Hemartrosis.     <br>   </font><font face="Verdana" size="2">- Hematomas musculares. </font>     <P><font face="Verdana" size="2">De manera diferente a lo que ocurre en la hemofilia    hereditaria, el nivel plasm&aacute;tico del FVIII no es un predictor adecuado    del riesgo de episodios hemorr&aacute;gicos<SUP>23</SUP> y estos son fundamentalmente    del tipo cut&aacute;neo-mucoso (equ&iacute;mosis, ep&iacute;staxis, menorragia,    hematuria, sangramiento digestivo); los hematomas musculares y las hemartrosis    son poco comunes.<SUP>4</SUP> Ocasionalmente pueden ocurrir hemorragias sist&eacute;micas    con peligro para la vida del paciente. </font>     <P><font face="Verdana" size="2"><I>Collins</I> y otros encontraron una    incidencia del 9 % de sangramientos fatales en pacientes con HAA.<SUP>1</SUP>    Estos mismos autores hallaron que la causa de muerte en las primeras semanas    se deb&iacute;a principalmente a sangramientos digestivos y pulmonares, y las    muertes tard&iacute;as fueron consecutivas a hemorragia intracraneal y retroperitoneal,    as&iacute; como a complicaciones infecciosas secundarias al tratamiento inmunosupresor.    </font>     <P>    <br>     <P>      <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="3"><B>DIAGN&Oacute;STICO</B> </font>     <P>      <P><font face="Verdana" size="2">El diagn&oacute;stico de la HAA debe sospecharse    en un paciente con manifestaciones hemorr&aacute;gicas de comienzo agudo sin    historia previa de trastornos de la hemostasia, que se acompa&ntilde;a de una    prolongaci&oacute;n inexplicable del tiempo parcial de tromboplastina activado    (TPTA).<SUP>24</SUP> </font>     <P>      <P><font face="Verdana" size="2"><I>Determinan el diagn&oacute;stico de la hemofilia    A adquirida:</I> </font>     <P><font face="Verdana" size="2">- La prolongaci&oacute;n del tiempo parcial de    tromboplastina activado en mezclas de plasma del paciente y plasma normal.        <br>   </font><font face="Verdana" size="2">- La disminuci&oacute;n de la actividad    del factor VIII.     <br>   </font><font face="Verdana" size="2">- La presencia de inhibidores del factor    VIII. </font>     <P><font face="Verdana" size="2">La prolongaci&oacute;n del TPTA en una mezcla    de plasma del paciente y plasma normal despu&eacute;s de 2 horas de incubaci&oacute;n    a 37 &#176;C, denota la presencia de un inhibidor.<SUP>25</SUP> Sin embargo,    es necesaria la determinaci&oacute;n de los factores VIII, IX y XI para un diagn&oacute;stico    adecuado. El hallazgo de una disminuci&oacute;n aislada de la actividad de FVIII    sugiere el diagn&oacute;stico de HAA. Es necesario tener en cuenta que en algunos    casos, todos los factores del sistema intr&iacute;nseco pueden estar disminuidos    como consecuencia de la neutralizaci&oacute;n por el inhibidor del factor VIII    presente en los plasmas sustratos utilizados para las determinaciones de estos    factores en el plasma.<SUP>26 </SUP> </font>     <P><font face="Verdana" size="2">La presencia del anticoagulante l&uacute;pico    (AL) es otro elemento que puede interferir en la determinaci&oacute;n del TPTA,    de la actividad del FVIII y de los inhibidores, por su conocida acci&oacute;n    sobre los fosfol&iacute;pidos utilizados en estos ensayos.<B> </B>Aunque desde    el punto de vista cl&iacute;nico el AL no est&aacute; asociado con manifestaciones    hemorr&aacute;gicas y se caracteriza por una tendencia a la hipercoagulabilidad<SUP>27</SUP> y, adem&aacute;s, puede diferenciarse por los resultados del estudio<B>    </B>de mezcla del plasma del paciente y plasma normal, ya que a diferencia de    los inhibidores del FVIII la neutralizaci&oacute;n del factor no se incrementa    con la incubaci&oacute;n de la mezcla,<SUP>28</SUP> en caso de sospecha de    AL debe realizarse su determinaci&oacute;n espec&iacute;fica.<SUP>29</SUP>    </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">La determinaci&oacute;n del inhibidor del FVIII    es imprescindible para establecer el diagn&oacute;stico de HAA. El m&eacute;todo    desarrollado por <I>Kasper</I> y otros<I>,</I><SUP>7</SUP> utilizado habitualmente,    fue dise&ntilde;ado para cuantificar aloanticuerpos contra el FVIII que muestran    una cin&eacute;tica tipo 1, como ocurre en la hemofilia A hereditaria. En el    caso de los autoanticuerpos en la HAA, por sus caracter&iacute;sticas cin&eacute;ticas    ya mencionadas, provocan una inhibici&oacute;n incompleta del FVIII con actividad    del factor en el plasma, a&uacute;n en presencia de altos t&iacute;tulos del    inhibidor, por lo que esta t&eacute;cnica, aunque detecta el autoanticuerpo,    no nos permite establecer su verdadera potencia.<SUP>28</SUP> </font>     <P>    <br>     <P>      <P>      <P><font face="Verdana" size="3"><B>TRATAMIENTO</B> </font>     <P>      <P><font face="Verdana" size="2">El tratamiento de la HAA incluye 2 aspectos fundamentales:    el control de las manifestaciones hemorr&aacute;gicas y la supresi&oacute;n    de la producci&oacute;n del autoanticuerpo (<a href="/img/revistas/hih/v26n3/t0201310.gif">tabla    2</a>). </font>     
<P align="left"><font face="Verdana" size="2">El tratamiento antihemorr&aacute;gico    debe iniciarse de manera inmediata independientemente del t&iacute;tulo del    inhibidor.<SUP>1,30</SUP> En esta etapa es necesario evitar los procederes    invasivos siempre que sea posible. </font>      <P><font face="Verdana" size="2">Los productos que sortean el efecto del inhibidor:    el concentrado de factor VIIa recombinante (FVIIar) y el concentrado de complejo    protromb&iacute;nico (CCPA), se consideran la terap&eacute;utica de primera    l&iacute;nea para detener el sangramiento en pacientes con HAA.<SUP>23,31</SUP>    </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">El uso exitoso del FVIIar en pacientes con inhibidores    del FVIII comenz&oacute; en la d&eacute;cada de los 80 en pacientes con hemofilia    A hereditaria.<SUP>32</SUP> En los &uacute;ltimos a&ntilde;os se ha demostrado    su eficacia como agente hemost&aacute;tico en otros trastornos hemorr&aacute;gicos<SUP>33,34</SUP> que incluyen la HAA.<SUP>35,36</SUP> Se administra a la dosis    de 90-120 </font><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#181;</FONT><font face="Verdana" size="2">g/kg cada 2-3 horas hasta obtener la hemostasia que ocurre    habitualmente entre 24 y 72 horas, en dependencia del sitio y la severidad del    sangramiento.<SUP>37 </SUP> </font>     <P><font face="Verdana" size="2">El FVIIar es un agente con potente actividad    procoagulante, por lo que te&oacute;ricamente su uso podr&iacute;a representar    un riesgo potencial para el desarrollo de eventos tromb&oacute;ticos. <I>Sumner</I>    y otros encontraron en 189 pacientes tratados con FVIIIar, 7,5 % de accidentes    tromb&oacute;ticos, particularmente arteriales.<SUP>35</SUP> Sin embargo, se    desconoce si algunos factores de riesgo como edad avanzada y enfermedades cardiovasculares,    entre otras, tienen alguna influencia en estos resultados. Por otra parte, en    una revisi&oacute;n reciente <I>Abshire</I> y otros hallaron menos del 1 % de    eventos tromb&oacute;ticos en 800 000 infusiones de FVIIar en pacientes con    hemofilia A hereditaria y adquirida.<SUP>37</SUP> En general, se considera    que la incidencia de complicaciones tromb&oacute;ticas en pacientes tratados    con FVIIar es baja y que el uso de este producto es seguro. </font>     <P><font face="Verdana" size="2">El CCPA, que es un concentrado plasm&aacute;tico    de factores dependientes de la vitamina K, ha sido ampliamente utilizado en    pacientes con hemofilia A hereditaria e inhibidores del FVIII y en menor medida    en la HAA. Forma parte, junto con el FVIIar, del tratamiento de primera l&iacute;nea    en estos pacientes. Con dosis de 50-100 UI/kg cada 8-12 horas se han obtenido    respuestas favorables.<SUP>31</SUP> En algunos casos se han hallado complicaciones    tromb&oacute;ticas, particularmente cuando se administra en dosis mayores de    200 UI/kg, incluida la coagulaci&oacute;n intravascular diseminada (CID).<SUP>30</SUP>    </font>     <P><font face="Verdana" size="2">La asociaci&oacute;n de agentes fibrinol&iacute;ticos    con estos productos ha sido muy debatida, aunque algunos autores no recomiendan    esta asociaci&oacute;n: <I>Baudo</I> y otros utilizan el tratamiento con FVIIar    y &aacute;cido tranex&aacute;mico de modo rutinario, particularmente en presencia    de sangramientos mucosos.<SUP>38</SUP> </font>     <P><font face="Verdana" size="2">En el caso de no estar disponible el tratamiento    de primera l&iacute;nea con FVIIar o CCPA, pueden utilizarse otras medidas terap&eacute;uticas    alternativas para el control de los episodios hemorr&aacute;gicos, que en determinadas    circunstancias pueden ser efectivos. </font>     <P><font face="Verdana" size="2">De manera similar a lo que ocurre con la hemofilia    A hereditaria, el concentrado de FVIII plasm&aacute;tico o recombinante solo    ser&iacute;a eficaz en aquellos pacientes con una tasa de inhibidor menor de    5 UB/mL, ya que un nivel mayor del anticuerpo inactiva el factor transfundido.<SUP>30</SUP> </font>     <P><font face="Verdana" size="2">La plasmaf&eacute;resis puede ser utilizada en    situaciones de urgencia cuando sea necesaria la eliminaci&oacute;n r&aacute;pida    del inhibidor;<SUP>39</SUP> habitualmente de 5 a 7 sesiones en equipo de af&eacute;resis    son suficientes. </font>     <P><font face="Verdana" size="2">Con este mismo objetivo puede aplicarse la inmunoadsorci&oacute;n    extracorp&oacute;rea, que se considera una t&eacute;cnica &uacute;til y segura    para la eliminaci&oacute;n del inhibidor.<SUP>40,41</SUP> No obstante, este    proceder requiere personal especializado y un buen acceso venoso. </font>     <P><font face="Verdana" size="2">El uso de la desmopresina (DDAVP) ha sido sugerido    en algunos casos; sin embargo, su efectividad no est&aacute; claramente demostrada.    Tiene las mismas limitaciones del concentrado de FVIII, de manera que solo estar&iacute;a    indicada en pacientes con sangramientos leves y bajo t&iacute;tulo del autoanticuerpo.<SUP>42,43</SUP> Para valorar su indicaci&oacute;n en pacientes ancianos es    necesario tener en cuenta los efectos secundarios de este medicamento. </font>     <P><font face="Verdana" size="2">El tratamiento inmunosupresor es el otro elemento    esencial del manejo terap&eacute;utico de pacientes con HAA y de manera similar    al control de los episodios hemorr&aacute;gicos, debe iniciarse inmediatamente    despu&eacute;s de realizado el diagn&oacute;stico. </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">El nivel del inhibidor no es un predictor del    riesgo hemorr&aacute;gico; sin embargo, est&aacute; relacionado con la respuesta    al tratamiento inmunosupresor y se ha observado que aquellos pacientes con un    t&iacute;tulo m&aacute;s bajo del autoanticuerpo responden mejor al tratamiento.<SUP>30</SUP> </font>     <P><font face="Verdana" size="2">El r&eacute;gimen de inmunosupresi&oacute;n que    ha mostrado mayor eficacia en la supresi&oacute;n de la producci&oacute;n del    inhibidor es la administraci&oacute;n de prednisona en dosis de 1mg/kg/d&iacute;a    durante 4-6 semanas, sola o asociada con ciclofosfamida 1,5 a 2 mg/kg/d&iacute;a    durante 6 semanas.<SUP>15,23,44,45</SUP> Algunos autores han encontrado mejores    resultados con esta asociaci&oacute;n. <SUP>1</SUP> No obstante, el estudio    de supervivencia global y libre de enfermedad no muestra diferencia entre el    tratamiento con prednisona sola y su combinaci&oacute;n con la terapia citot&oacute;xica.<SUP>30</SUP> </font>     <P><font face="Verdana" size="2">Recientemente se ha introducido un nuevo agente    terap&eacute;utico en el tratamiento de la HAA, el rituximab,<SUP>46-49</SUP>    un anticuerpo monoclonal quim&eacute;rico anti-CD20 que se utiliza en el tratamiento    del linfoma.<SUP>50</SUP> Por su capacidad para depletar los linfocitos B productores    de autoanticuerpos<SUP>51</SUP> se ha administrado en varias enfermedades autoinmunes.<SUP>52-55</SUP> La dosis habitual es de 375 mg/m<SUP>2</SUP>/ semana hasta    4 semanas. Se considera de utilidad como terap&eacute;utica de segunda l&iacute;nea    en pacientes refractarios al tratamiento con corticosteroides o a su asociaci&oacute;n    con ciclofosfamida; o cuando est&eacute; contraindicado este r&eacute;gimen    terap&eacute;utico. </font>     <P><font face="Verdana" size="2">Con el uso de otros inmunosupresores como terapia    alternativa se han obtenido respuestas variables. Entre las m&aacute;s utilizadas    se encuentran la azatioprina, la vincristina, la ciclosporina y el micofenolato    de mofetil.<SUP>10,30,56,57</SUP> </font>     <P><font face="Verdana" size="2">La mayor&iacute;a de las drogas inmunosupresoras    est&aacute;n asociadas con efectos secundarios, en ocasiones de gravedad, como    en el caso de sepsis que pueden poner el peligro la vida del paciente, <SUP>15,58</SUP>    de manera que ser&iacute;a conveniente realizar un an&aacute;lisis previo de    las caracter&iacute;sticas del enfermo y su posible beneficio y seguridad antes    de iniciar el tratamiento con determinado inmunosupresor. </font>     <P><font face="Verdana" size="2">Los resultados del tratamiento con IgG endovenosa    en altas dosis en pacientes con HAA, han sido en general pobres.<SUP>10,15</SUP>    <I>Schwartz</I> y otros solo encontraron una supresi&oacute;n del inhibidor    en el 10 % de los casos con bajo t&iacute;tulo del anticuerpo.<SUP>59</SUP>    Algunos autores no recomiendan su uso en estos pacientes.<SUP>30</SUP> </font>     <P><font face="Verdana" size="2">Aunque te&oacute;ricamente podr&iacute;a estar    indicada en algunos enfermos, no se ha definido a&uacute;n si la aplicaci&oacute;n    de reg&iacute;menes de inmunotolerancia similares a los utilizados en pacientes    con hemofilia A hereditaria e inhibidores, son de utilidad en estos casos. </font>     <P><font face="Verdana" size="2">Se considera que el paciente ha alcanzado la    remisi&oacute;n completa cuando desaparece el inhibidor y el FVIII se encuentra    dentro de l&iacute;mites normales. </font>     <P><font face="Verdana" size="2"><I>Huth-K&uuml;hne</I> y otros han recomendado    el seguimiento ulterior de estos enfermos con TPTA y determinaci&oacute;n de    la actividad del FVIII, mensualmente durante los primeros 6 meses; cada 2 &oacute;    3 meses hasta 12 meses; y cada 6 meses durante el segundo a&ntilde;o.<SUP>30</SUP>    </font>     <p></p>    ]]></body>
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<body><![CDATA[<P>     <P>     <P>      <P>      <P>      <P><font face="Verdana" size="2">Recibido: 15 de marzo del 2010.     <br>   Aprobado: 2 de abril del 2010. </font>     <P>     <P>     <P>      ]]></body>
<body><![CDATA[<P>      <P>      <P><font face="Verdana" size="2">Prof. <I>Delfina Almagro V&aacute;zquez</I>.    Instituto de Hematolog&iacute;a e Inmunolog&iacute;a. Apartado 8070, Ciudad    de La Habana, CP 10800, Cuba. Tel (537) 643 8695, 8268, Fax (537) 644 2334.    e-mail: <U><a href="mailto:ihidir@hemato.sld.cu">ihidir@hemato.sld.cu</a></U></font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><i>Website</i>:    <u><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><u><font color="#0000ff"><a href="http://www.sld.cu/sitios/ihi" target="_blank">http://www.sld.cu/sitios/ihi</a></font></u></font></u></font>      <P>      <P>      <P>      <P>      <P>       ]]></body><back>
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