<?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>S0864-02892010000200002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Uso del factor VII activado recombinante como agente hemostático en trastornos hemorrágicos]]></article-title>
<article-title xml:lang="en"><![CDATA[Use of recombinant-activated factor VIIa as a hemostatic agent in hemorrhagic disorders]]></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>08</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2010</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<fpage>2</fpage>
<lpage>17</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-02892010000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-02892010000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-02892010000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La eficacia del tratamiento con factor VII activado recombinante (FVIIar) durante episodios hemorrágicos en pacientes hemofílicos con inhibidores y el conocimiento de su mecanismo de acción, determinó que en los últimos años se ampliara rápidamente su uso en pacientes con hemorragia de diversas causas no controladas con la terapéutica habitual; entre otras, defectos congénitos de la coagulación, trastornos plaquetarios, hepatopatías, cirugía, hemorragia intracraneal, sangramientos digestivos. Aunque un grupo importante de estas comunicaciones se han realizado en forma de casos reportados y serie de casos, se considera que los resultados obtenidos son importantes y que la administración de FVIIar es una alternativa en pacientes con hemorragia grave no controlada. A pesar de su potente acción procoagulante, el riesgo de complicaciones tromboembólicas es bajo y está relacionado en un grupo importante de pacientes con la presencia de otros factores protrombóticos. En la actualidad se considera que el FVIIar esta indicado en aquellos pacientes con hemorragia masiva que no responden a la terapia con componentes sanguíneos ni a medidas quirúrgicas apropiadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Effectiveness of the treatment with recombinant activated factor VII (raVII) during the hemorrhagic episodes in hemophilic patients using inhibitions and the knowledge of its action mechanism determined that in pas years its use will be expanded in patients with hemorrhage from non-controlled diverse causes using the usual therapeutics among other, congenital coagulation defects, platelet disorders, liver diseases, surgery, intracranial hemorrhage, digestive bleedings. Although a significant group of these communications have been carried out in reported cases and in cases series, it is considered that the results obtained are important and that the administration of raVII is an alternative in patients presenting with non-controlled severe hemorrhage. Despite its potent pro-coagulant action, thromboembolism complications risk is low and it is related to a significant group of patients with other prothrombotic factors. Nowadays, it is considered that raVII is prescribed in those patients with massive hemorrhage without response either to therapy using blood components or appropriate surgical measures.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[factor VIIa recombinante]]></kwd>
<kwd lng="es"><![CDATA[trastornos hemorrágicos]]></kwd>
<kwd lng="es"><![CDATA[eficacia]]></kwd>
<kwd lng="es"><![CDATA[eventos trombóticos]]></kwd>
<kwd lng="en"><![CDATA[Recombinant aVII]]></kwd>
<kwd lng="en"><![CDATA[hemorrhagic disorders]]></kwd>
<kwd lng="en"><![CDATA[effectiveness]]></kwd>
<kwd lng="en"><![CDATA[thrombotic events]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <P>    <P ALIGN="RIGHT"><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B>ART&Iacute;CULO  DE REVISI&Oacute;N</B></FONT></P>    <P>&nbsp;</P>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="4"><B>Uso  del factor VII activado recombinante como agente hemost&aacute;tico en trastornos  hemorr&aacute;gicos</B></FONT></P>    <P>&nbsp;</P>    <P><strong><font size="3" face="Verdana, Arial, Helvetica, sans-serif">Use  of recombinant-activated factor VIIa as a hemostatic agent in hemorrhagic disorders</font></strong></P>    <P>&nbsp;</P>    <P>&nbsp;</P><B>    <P>    <P>    ]]></body>
<body><![CDATA[<P>      <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">DrC. Delfina Almagro  V&aacute;zquez</FONT></B>     <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Instituto  de Hematolog&iacute;a e Inmunolog&iacute;a. Ciudad de La Habana, Cuba. </FONT>    <P>    <P>      <P>    <P>    <P><hr size="1" noshade>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B>RESUMEN</B>  </FONT></P>    ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">La eficacia  del tratamiento con factor VII activado recombinante (FVIIar) durante episodios  hemorr&aacute;gicos en pacientes hemof&iacute;licos con inhibidores y el conocimiento  de su mecanismo de acci&oacute;n, determin&oacute; que en los &uacute;ltimos a&ntilde;os  se ampliara r&aacute;pidamente su uso en pacientes con hemorragia de diversas  causas no controladas con la terap&eacute;utica habitual; entre otras, defectos  cong&eacute;nitos de la coagulaci&oacute;n, trastornos plaquetarios, hepatopat&iacute;as,  cirug&iacute;a, hemorragia intracraneal, sangramientos digestivos. Aunque un grupo  importante de estas comunicaciones se han realizado en forma de casos reportados  y serie de casos, se considera que los resultados obtenidos son importantes y  que la administraci&oacute;n de FVIIar es una alternativa en pacientes con hemorragia  grave no controlada. A pesar de su potente acci&oacute;n procoagulante, el riesgo  de complicaciones tromboemb&oacute;licas es bajo y est&aacute; relacionado en  un grupo importante de pacientes con la presencia de otros factores protromb&oacute;ticos.  En la actualidad se considera que el FVIIar esta indicado en aquellos pacientes  con hemorragia masiva que no responden a la terapia con componentes sangu&iacute;neos  ni a medidas quir&uacute;rgicas apropiadas. </FONT>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><I>Palabras  clave:</I> factor VIIa recombinante, trastornos hemorr&aacute;gicos, eficacia,  eventos tromb&oacute;ticos. <hr size="1" noshade></FONT>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B>ABSTRACT</B>  </FONT>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Effectiveness  of the treatment with recombinant activated factor VII (raVII) during the hemorrhagic  episodes in hemophilic patients using inhibitions and the knowledge of its action  mechanism determined that in pas years its use will be expanded in patients with  hemorrhage from non-controlled diverse causes using the usual therapeutics among  other, congenital coagulation defects, platelet disorders, liver diseases, surgery,  intracranial hemorrhage, digestive bleedings. Although a significant group of  these communications have been carried out in reported cases and in cases series,  it is considered that the results obtained are important and that the administration  of raVII is an alternative in patients presenting with non-controlled severe hemorrhage.  Despite its potent pro-coagulant action, thromboembolism complications risk is  low and it is related to a significant group of patients with other prothrombotic  factors. Nowadays, it is considered that raVII is prescribed in those patients  with massive hemorrhage without response either to therapy using blood components  or appropriate surgical measures.</font></p>    <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><em>Key  words</em>: Recombinant aVII, hemorrhagic disorders, effectiveness, thrombotic  events. <hr size="1" noshade></font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"></font>      <P>&nbsp;</P>    <P>&nbsp;</P>    <P>     ]]></body>
<body><![CDATA[<P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">INTRODUCCI&Oacute;N</FONT></B>  </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">La demostraci&oacute;n  de la efectividad del factor VII activado (FVIIa) como agente hemost&aacute;tico  fue establecida por <I>Hedner</I> y <I>Kisiel</I><SUP>1</SUP> en la d&eacute;cada  de los 80 en pacientes hemof&iacute;licos con inhibidores del factor VIII (FVIII).  La disponibilidad del FVIIa recombinante (FVIIar; <I>NovoSeven, NovoNordisk</I>,  Bagsvaerd, Dinamarca) permiti&oacute; un uso m&aacute;s generalizado en estos  pacientes,<SUP>2</SUP> lo que determin&oacute; que en la actualidad se considere  el tratamiento de elecci&oacute;n durante los episodios hemorr&aacute;gicos en  paciente hemof&iacute;licos con inhibidores.</FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Aunque  las indicaciones del FVIIar aprobadas son relativamente limitadas, este producto  ha sido utilizado no solo en pacientes hemof&iacute;licos con inhibidores y sin  estos,<SUP>3</SUP> sino tambi&eacute;n en m&uacute;ltiples trastornos de la hemostasia  cong&eacute;nitos y adquiridos, y en general, en pacientes con sangramientos no  controlables con las medidas terap&eacute;uticas habituales.<SUP>4-7</SUP> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Las  consecuencias que resultan del tratamiento convencional de los episodios hemorr&aacute;gicos  graves con cristaloides, coloides y productos de la sangre, en ocasiones provocan  un incremento de la coagulopat&iacute;a y un riesgo potencial de transmisi&oacute;n  de agentes infecciosos, lo que ha sugerido la necesidad de un esquema terap&eacute;utico  que pudiera complementar el tratamiento del sangramiento grave. Para <I>Hoffman</I>,<SUP>8</SUP>  el FVIIar pudiera ser de utilidad como sustituto o suplemento de la transfusi&oacute;n  de productos de la sangre en pacientes con sangramientos severos. </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">En  esta revisi&oacute;n solo abordaremos el tratamiento del concentrado de FVIIar  en pacientes no hemof&iacute;licos.</FONT>    <P>    <P>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">MECANISMO  DE ACCI&Oacute;N</FONT></B> </FONT>    ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Se  conoce que durante el mecanismo hemost&aacute;tico el FVIIa se une con el factor  tisular (FT) sobre la superficie celular en el sitio de da&ntilde;o vascular (<A HREF="/img/revistas/hih/v26n2/f0102210.jpg">Fig.  1</A>). El complejo FT/FVIIa activa al factor X (FX) y al factor IX (FIX). El  complejo FXa-factor Va (FVa) act&uacute;a sobre la protrombina, lo que resulta  en la generaci&oacute;n de una cantidad de trombina, que aunque peque&ntilde;a,  es suficiente para liberar el FVIII del factor von Willebrand (FvW), activar los  factores V y XI y lo m&aacute;s relevante, provocar la activaci&oacute;n plaquetaria.  </FONT>    
<P ALIGN="CENTER"><A NAME="fig1"></A><A HREF="#fig1"><IMG SRC="/img/revistas/hih/v26n2/f0102210.jpg" WIDTH="547" HEIGHT="553" BORDER="0"></A>    
<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">    <BR>Por  otra parte, el inhibidor de la v&iacute;a del FT (IVFT) no tiene acci&oacute;n  sobre el FIX, por lo que este se sit&uacute;a sobre la superficie de las plaquetas  activadas donde se une con el FVIII para generar FXa, que en presencia del FVa  contribuye a la formaci&oacute;n del complejo protrombinasa, lo que determina  la formaci&oacute;n de grandes cantidades de trombina que son las responsables  de la conversi&oacute;n del fibrin&oacute;geno en fibrina. La trombina, adem&aacute;s,  tiene una acci&oacute;n protectora del coagulo a trav&eacute;s de la activaci&oacute;n  del inhibidor de la fibrin&oacute;lisis activado por trombina (TAFI) (<A HREF="/img/revistas/hih/v26n2/f0202210.jpg">Fig.  2</A>).<SUP>9,10</SUP> </FONT>    
<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Se  ha demostrado que las altas concentraciones de FVIIa, solo alcanzadas por dosis  farmacol&oacute;gicas de FVIIar, pueden convertir directamente el FX a FXa sobre  la superficie de las plaquetas activadas sin la presencia del FVIIIa o FIXa, lo  que resulta en una generaci&oacute;n explosiva de trombina que, aunque menor que  la normal, es suficientemente r&aacute;pida y en cantidades adecuadas para alcanzar  un alto grado de eficacia en el tratamiento de pacientes hemof&iacute;licos A  y B.<SUP>11</SUP> Se considera que el mecanismo de acci&oacute;n m&aacute;s importante  del FVIIar es su posibilidad de unirse con las plaquetas activadas y activar directamente  al FX en ausencia del FT. Es necesario se&ntilde;alar que el FVIIar no se une  con las plaquetas en reposo, por lo que su efecto se localiza en los sitios de  da&ntilde;o vascular.<SUP>12,13</SUP> Otra acci&oacute;n del FVIIar recientemente  descrita es su influencia sobre la estabilizaci&oacute;n del co&aacute;gulo a  trav&eacute;s de la activaci&oacute;n del TAFI.<SUP>11</SUP></FONT>    <P>    <P>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">FARMACOCIN&Eacute;TICA</FONT></B>  </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Se ha observado  que el aclaramiento del FVIIar en adultos normales es de alrededor de 33 mL/kg/h<SUP>14</SUP>  y la vida media de 2,72 horas,<SUP>15</SUP> que ambos son independientes de la  dosis utilizada y que existe una amplia variabilidad intrapacientes.<SUP>16</SUP>  En estudios realizados en ni&ntilde;os se encontr&oacute; una vida media m&aacute;s  corta, de alrededor de 1,32 horas, lo que se corresponde con un aclaramiento m&aacute;s  r&aacute;pido del producto.<SUP>17</SUP> Estas diferencias en los par&aacute;metros  farmacocin&eacute;ticos entre ni&ntilde;os y adultos sugieren que podr&iacute;an  ser necesarias dosis mayores en la edad pedi&aacute;trica.</FONT>    ]]></body>
<body><![CDATA[<P>    <P>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">USO  DEL FVIIar EN TRASTORNOS HEREDITARIOS DE LA COAGULACI&Oacute;N</FONT></B> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El  FVIIar ha mostrado su eficacia en el tratamiento de episodios hemorr&aacute;gicos  en pacientes con trastornos hereditarios de la coagulaci&oacute;n distintos de  la hemofilia, como son: el d&eacute;ficit cong&eacute;nito de factor VII, el d&eacute;ficit  cong&eacute;nito de factor X, el d&eacute;ficit cong&eacute;nito de factor XI,  y la enfermedad de von Willebrand. </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">En  el caso de pacientes con d&eacute;ficit cong&eacute;nito de FVII, se ha demostrado  que dosis relativamente bajas, entre 20 y 30 &#181;g/kg cada 2 o 3 horas son suficientes  para detener el sangramiento, ya que estos pacientes tienen niveles normales de  factores VIII y IX y son capaces de generar una cantidad normal de trombina, una  vez que el mecanismo de la coagulaci&oacute;n se haya iniciado por la infusi&oacute;n  de estas dosis de FVIIar.<SUP>18-20</SUP> Tambi&eacute;n en algunos casos de d&eacute;ficit  de FX ha sido efectiva la administraci&oacute;n del FVIIar. </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Publicaciones  anecd&oacute;ticas han comunicado el uso efectivo del concentrado de FVIIar en  pacientes con enfermedad de von Willebrand (EvW) tipo 3 y en casos con anticuerpos  al FvW,<SUP>21</SUP> as&iacute; como pacientes con d&eacute;ficit de FXI con inhibidores  y sin estos.<SUP>22</SUP> </FONT>    <P>    <P>     <P>     ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">USO  DEL FVIIar EN TRASTORNOS PLAQUETARIOS</FONT></B></FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Entre  los trastornos plaquetarios en que se ha usado el Factor VII activado est&aacute;n,  por un lado, las trombocitopat&iacute;as tales como la enfermedad de Glanzmann,  el s&iacute;ndrome de Bernard-Soulier y el s&iacute;ndrome de Hermansky-Pudlak;  y por otro lado, las trombocitopenias. </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El  primer trastorno en que se aprob&oacute; el uso de FVIIar despu&eacute;s de la  hemofilia fue en la tromboastenia de Glanzmann, particularmente en aquellos pacientes  con episodios hemorr&aacute;gicos y anticuerpos a la GPIIb/IIIa y por lo tanto,  refractarios a la infusi&oacute;n de plaquetas.<SUP>23</SUP> Esta situaci&oacute;n  constituye un verdadero reto terap&eacute;utico y hasta ahora el tratamiento con  concentrado de FVIIar es probablemente la &uacute;nica posibilidad para lograr  el control del sangramiento en pacientes con enfermedad de Glanzmann refractarios  al uso de plaquetas. En una serie de pacientes fue efectivo en el 48 % de los  casos.<SUP>24</SUP> </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El  tratamiento con FVIIar tambi&eacute;n ha sido recomendado en otras trombocitopat&iacute;as  hereditarias como el s&iacute;ndrome de Bernard-Soulier.<SUP>25</SUP> Se ha sugerido  que este producto es capaz de promover la adhesi&oacute;n de las plaquetas al  sitio del da&ntilde;o vascular a&uacute;n en el caso que presenten alg&uacute;n  defecto funcional, debido a un aumento local de la generaci&oacute;n de trombina.<SUP>26</SUP>  Del Pozo y otros,<SUP>27</SUP> utilizaron exitosamente el FVIIar asociado con  concentrado de plaquetas en un paciente con s&iacute;ndrome de Hermansky-Pudlak  que fue sometido a una tiroidectom&iacute;a. Una de las indicaciones del FVIIar  m&aacute;s controvertidas es quiz&aacute;s su uso en pacientes con trombocitopenia,  si consideramos el papel central de las plaquetas en su mecanismo de acci&oacute;n.  Sin embargo, ha sido utilizado con &eacute;xito en pacientes con disminuci&oacute;n  marcada de plaquetas.<SUP>28-30</SUP> Aunque se desconoce la concentraci&oacute;n  plaquetaria m&iacute;nima necesaria para detener el sangramiento, algunos autores  han logrado aumentar la eficiencia del FVIIar con la utilizaci&oacute;n de dosis  m&aacute;s altas en pacientes con trombocitopenia hasta de 1 &#215; 10<SUP>9</SUP>/L.  Estos resultados concuerdan con los hallazgos de Kjalke y otros<SUP>31</SUP> en  un modelo <I>in vitro</I> basado en c&eacute;lulas en que demostraron que dosis  altas de FVIIar aumentaban la generaci&oacute;n de trombina en condiciones de  trombocitopenia.</FONT>    <P>     <P>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">USO  DEL FVIIar EN TRASTORNOS HEP&Aacute;TICOS</FONT></B></FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Las  manifestaciones hemorr&aacute;gicas en pacientes con hepatopat&iacute;as graves  son en ocasiones de dif&iacute;cil control con el tratamiento sustitutivo habitual,  particularmente los sangramientos profusos por v&aacute;rices esof&aacute;gicas  y durante el trasplante hep&aacute;tico. El tratamiento profil&aacute;ctico para  procederes invasivos, en especial la biopsia hep&aacute;tica, es otra situaci&oacute;n  en algunos casos no resuelta con la terap&eacute;utica sustitutiva con plasma  fresco congelado (PFC). </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El  hallazgo de que la infusi&oacute;n de FVIIar normalizaba el tiempo de protrombina  (TP) en pacientes con cirrosis hep&aacute;tica, propici&oacute; su uso en enfermos  con hepatopat&iacute;as graves y varices esof&aacute;gicas.<SUP>32</SUP> La dosis  utilizada en estos casos ha sido variable (5-120 &#181;g/kg), y aunque la respuesta  al tratamiento fue en general efectiva, se han comunicado fracasos sobre todo  por sangramientos recurrentes. Es un hecho demostrado que la infusi&oacute;n de  FVIIar es m&aacute;s efectiva que el PFC solo y que los mejores resultados se  obtienen con el uso de ambos productos.<SUP>33</SUP> </FONT>    ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Otro  de los usos del FVIIar es el tratamiento profil&aacute;ctico en pacientes con  trastornos de la coagulaci&oacute;n por hepatopat&iacute;a cr&oacute;nica que  van a ser sometidos a biopsia hep&aacute;tica u otro proceder invasivo en los  que ha fracasado la terap&eacute;utica sustitutiva cl&aacute;sica. Se ha observado  que al menos el 74 % de los pacientes tratados con FVIIar han alcanzado una hemostasia  adecuada para este tipo de proceder.<SUP>34</SUP> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El  uso del concentrado de FVIIar en el trasplante hep&aacute;tico es a&uacute;n muy  controvertido, ya que los ensayos cl&iacute;nicos han mostrado resultados contradictorios.  Seg&uacute;n los hallazgos de un grupo de investigadores, la infusi&oacute;n de  FVIIar reduce los requerimientos transfusionales en pacientes sometidos a trasplante  hep&aacute;tico.<SUP>35-37</SUP> Sin embargo, otros autores no hallaron diferencias  significativas entre el FVIIar y el placebo en este tipo de enfermo.<SUP>38,39</SUP>  </FONT>    <P>    <P>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">USO  DEL FVIIar EN PROCESOS QUIR&Uacute;RGICOS</FONT></B> </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Las  intervenciones quir&uacute;rgicas son, sin duda, situaciones en las que los eventos  hemorr&aacute;gicos graves son frecuentes. La administraci&oacute;n del FVIIar  ha sido ensayada con &eacute;xito durante complicaciones hemorr&aacute;gicas en  m&uacute;ltiples procesos quir&uacute;rgicos, en particular en cirug&iacute;a  card&iacute;aca.<SUP>40-42</SUP> <I>Diprose</I> y otros,<SUP>43</SUP> con el uso  de una sola dosis de 90 &#181;g/kg de FVIIar despu&eacute;s de la terminaci&oacute;n  de la derivaci&oacute;n <I>bypass</I> cardiopulmonar y la administraci&oacute;n  de sulfato de protamina para revertir la acci&oacute;n de la heparina, hallaron  una disminuci&oacute;n significativa de los requerimientos transfusionales. Sin  embargo, <I>Ekert</I> y otros,<SUP>4</SUP> con varias dosis de 40 &#181;g/kg no  lograron disminuir la p&eacute;rdida de sangre y las transfusiones en pacientes  sometidos a este mismo proceder. Es por ello que a pesar del n&uacute;mero importante  de comunicaciones que sugieren la eficacia del FVIIar, algunos autores consideran  que no es efectivo en todos los casos.<SUP>45</SUP> </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El  FVIIar se ha utilizado en complicaciones hemorr&aacute;gicas durante otros procederes  quir&uacute;rgicos. En un ensayo a doble ciegas en pacientes sometidos a prostatectom&iacute;a  retrop&uacute;bica, se demostr&oacute; que con dosis de 40 &#181;g/kg no fue necesario  el uso de transfusi&oacute;n de eritrocitos.<SUP>46</SUP> </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">De  manera anecd&oacute;tica se ha se&ntilde;alado la efectividad de la infusi&oacute;n  de FVIIar en una variedad de procederes quir&uacute;rgicos, entre ellos, la cirug&iacute;a  reconstructiva,<SUP>47</SUP> el trasplante renal<SUP>48</SUP> y la cirug&iacute;a  p&eacute;lvica,<SUP>49</SUP> no obstante, no siempre se ha obtenido una respuesta  efectiva<I>. Raobaikady</I> y otros,<SUP>50</SUP> no encontraron diferencias significativas  en relaci&oacute;n con la p&eacute;rdida de sangre y requerimientos transfusionales  en pacientes sometidos a reparaci&oacute;n acet&aacute;bulo pelviana tratados  con 90 &#181;g/kg de FVIIar y aquellos en que se utiliz&oacute; placebo.</FONT>      <P>    ]]></body>
<body><![CDATA[<P>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">USO  DEL FVIIar EN TRASTORNOS HEMORR&Aacute;GICOS</FONT></B> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Este  factor se ha utilizado en diferentes condiciones hemorr&aacute;gicas: </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Sangramiento    intracraneal. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Sangramiento    por traumatismos. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Sangramiento    secundario a anticoagulantes. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Sangramiento    gastrointestinal. </FONT>      <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Hemorragia    <I>post partum.</I> </FONT>      <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Trasplante    de m&eacute;dula &oacute;sea. </FONT>     ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Coagulaci&oacute;n    intravascular diseminada. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Dengue hemorr&aacute;gico.    </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Hemorragia    alveolar difusa. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Quemaduras    extensas. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Anomal&iacute;as    vasculares. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">&#149; Insuficiencia    renal. </FONT>     <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B>    <BR>Hemorragia  intracraneal</B> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Los  resultados del uso del FVIIar en la hemorragia intracraneal han sido contradictorios,  probablemente por el escaso n&uacute;mero de ensayos cl&iacute;nicos aleatorios  y de pacientes estudiados. </FONT>    ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Algunos  autores no han obtenido una respuesta eficaz en ensayos con un reducido n&uacute;mero  de casos.<SUP>51,52</SUP> Sin embargo, en ensayos controlados con una cantidad  mayor de pacientes, se muestran evidencias que el tratamiento con FVIIar dentro  de las 4 horas despu&eacute;s del comienzo del sangramiento, limita el crecimiento  del hematoma, lo que influye de manera relevante en la evoluci&oacute;n cl&iacute;nica  de estos enfermos, ya que se ha demostrado que el crecimiento del hematoma est&aacute;  relacionado con un pron&oacute;stico m&aacute;s grave y aumento de la mortalidad.<SUP>53-55</SUP>  </FONT>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><I>    <BR>Por  traumatismos:</I> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Dos  causas esenciales provocan el sangramiento profuso secundario a trauma: la hemorragia  en el sitio de la herida y los trastornos de la coagulaci&oacute;n que se producen  despu&eacute;s del trauma y que est&aacute;n presentes entre el 25 y el 36 % de  los pacientes a su llegada al hospital.<SUP>56</SUP> Se considera que esta hemorragia  postraum&aacute;tica secundaria a la coagulopat&iacute;a, es la causa principal  de mortalidad en pacientes con traumatismo severo y su naturaleza es multifactorial,  donde tienen un papel importante la hemodiluci&oacute;n, consecuencia de la infusi&oacute;n  de grandes vol&uacute;menes de cristaloides, coloides y productos de la sangre,  y que no solo est&aacute; influida por el volumen transfundido, sino tambi&eacute;n  por el tipo de fluido utilizado, y que se expresa por la presencia de trombocitopenia  y disminuci&oacute;n de factores e inhibidores de la coagulaci&oacute;n,<SUP>57</SUP>  la hipotermia que provoca disfunci&oacute;n plaquetaria, trastornos de la coagulaci&oacute;n  e hiperfibrin&oacute;lisis,<SUP>58</SUP> y la acidosis resultante de una disminuci&oacute;n  de la perfusi&oacute;n y la acumulaci&oacute;n de &aacute;cido l&aacute;ctico.  Se ha demostrado que un peque&ntilde;o descenso en el pH lesiona la funci&oacute;n  de las plaquetas y de las enzimas de la coagulaci&oacute;n, particularmente en  presencia de hipotermia.<SUP>59</SUP> </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><I>Kenet</I>  y colaboradores<SUP>60</SUP> publicaron el primer caso con traumatismo severo  por herida de arma de fuego en el abdomen tratado exitosamente con FVIIar. A partir  de ese momento, se han realizado m&uacute;ltiples ensayos cl&iacute;nicos con  el uso de este producto en pacientes con trauma grave. <I>Martinowitz </I>y colaboradores<SUP>61</SUP>  lograron el control del sangramiento en pacientes que sufrieron trauma severo  con la administraci&oacute;n de 1 a 3 dosis de FVIIar en el 79 % de los casos.  Otros autores han obtenido resultados similares.<SUP>62</SUP> </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B>    <BR>Pacientes  con tratamiento anticoagulante</B></FONT>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">La  posibilidad de controlar el sangramiento con FVIIar en pacientes tratados con  antagonistas de la vitamina K, est&aacute; avalada por los resultados de estudios  que demuestran que el FVIIar es capaz de normalizar el TP y el INR en voluntarios  sanos con disminuci&oacute;n de factores dependientes de la vitamina K por la  administraci&oacute;n de acenocumarol,<SUP>63</SUP> y que las dosis entre 15-90  &#181;g/kg de FVIIar provocan un marcado acortamiento del TP en pacientes con  intoxicaci&oacute;n warfar&iacute;nica.<SUP>64</SUP> </FONT>     ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Con  la asociaci&oacute;n de FVIIar a dosis entre 30 y 135 &#181;g/kg, vitamina K y  PFC se logr&oacute; una r&aacute;pida correcci&oacute;n del INR en pacientes con  hemorragia intracraneal asociada con warfarina.<SUP>65</SUP> </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Se  ha se&ntilde;alado que la infusi&oacute;n de FVIIar podr&iacute;a ser de utilidad  en el control de episodios hemorr&aacute;gicos no solo en pacientes anticoagulados  con antivitaminas K, sino tambi&eacute;n con heparina no fraccionada y de bajo  peso molecular,<SUP>66</SUP> Sin embargo, <I>Wolzt</I> y otros,<SUP>67</SUP> no  lograron incrementar la generaci&oacute;n de trombina en voluntarios sanos tratados  con melagatran, probablemente debido a que este medicamento es un inhibidor directo  de la trombina.</FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B>    <BR>Otras  complicaciones hemorr&aacute;gicas</B></FONT>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">En  los &uacute;ltimos a&ntilde;os se han acumulado un n&uacute;mero importante de  comunicaciones, muchas de ellas con car&aacute;cter anecd&oacute;tico, sobre el  uso del FVIIar en el control de sangramientos masivos en una variedad de condiciones  cl&iacute;nicas, particularmente cuando otras medidas han fracasado. </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Se  ha se&ntilde;alado que en pacientes con sangramiento gastrointestinal la administraci&oacute;n  de FVIIar es efectiva si se asocia con la terap&eacute;utica sustitutiva tradicional.<SUP>68</SUP>  </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">La hemorragia  posparto constituye una de las causas principales de muerte materna. Varios autores  han sugerido que el tratamiento con FVIIar pudiera ser efectivo en estas pacientes.<SUP>69,70</SUP>  </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Los resultados  del uso del FVIIar en las complicaciones hemorr&aacute;gicas despu&eacute;s del  trasplante de m&eacute;dula &oacute;sea o de c&eacute;lulas progenitoras hematopoy&eacute;ticas  ha sido muy variable. <I>Karimi</I> y otros<SUP>71</SUP> obtuvieron una respuesta  excelente en 2 pacientes con cistitis hemorr&aacute;gica intratable por ciclofosfamida  despu&eacute;s del trasplante alog&eacute;nico de m&eacute;dula &oacute;sea. Sin  embargo, <I>Pihusch</I> y otros <SUP>72</SUP> no encontraron diferencia significativa  en relaci&oacute;n con el sangramiento y los requerimientos transfusionales en  100 pacientes despu&eacute;s del trasplante de c&eacute;lulas progenitoras hematopoy&eacute;ticas  con varias dosis del producto. </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">La  indicaci&oacute;n del FVIIar en pacientes con coagulaci&oacute;n intravascular  diseminada (CID) y sangramientos profusos ha sido muy discutida. Algunos autores  consideran que no debe utilizarse en estos pacientes, ya que la CID est&aacute;  asociada con la exposici&oacute;n del FT mediada por citoquinas,<SUP>73</SUP>  por lo que podr&iacute;a te&oacute;ricamente provocar un desarrollo ulterior de  trombosis intravascular. Sin embargo, como ya hemos se&ntilde;alado anteriormente,  el FVIIar puede contribuir a la generaci&oacute;n de trombina por un mecanismo  independiente del FT y activar el FX directamente sobre la superficie de las plaquetas  en el sitio del da&ntilde;o vascular, por lo que es poco probable la activaci&oacute;n  sist&eacute;mica de la coagulaci&oacute;n. Por otra parte, no se han observado  eventos adversos en pacientes con CID en los que se ha logrado detener el sangramiento  con la administraci&oacute;n de FVIIar.<SUP>74</SUP> </FONT>     ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><I>Chuansumrit</I>  y otros,<SUP>75</SUP> observaron que la infusi&oacute;n de FVIIar en un grupo  de ni&ntilde;os con dengue hemorr&aacute;gico logr&oacute; mejorar la hemostasia  en comparaci&oacute;n con los pacientes a los que se les administr&oacute; un  placebo. Sin embargo, las transfusiones de eritrocitos y plasma no disminuyeron.  </FONT>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El FVIIar  ha sido utilizado durante episodios hemorr&aacute;gicos en una gran variedad de  trastornos, tales como hemorragia alveolar difusa,<SUP>76</SUP> quemaduras extensas,<SUP>77</SUP>  tratamiento de anomal&iacute;as vasculares<SUP>78 </SUP>y sangramientos en la  insuficiencia renal.<SUP>79</SUP> </FONT>    <P>    <P>    <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">CONTROL  DE LABORATORIO</FONT></B> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">En  la actualidad, el mejor indicador de la eficiencia del tratamiento con FVIIar  es la detenci&oacute;n del sangramiento.<SUP>6</SUP> El acortamiento del TP y  del tiempo parcial de tromboplastina activado (TPTA) no es una expresi&oacute;n  fidedigna de la eficacia del tratamiento. Otros m&eacute;todos est&aacute;n en  proceso de evaluaci&oacute;n para determinar el efecto del FVIIar, entre ellos  la tromboelastografia rotacional y la generaci&oacute;n de trombina.<SUP>80</SUP></FONT>    <P>    <P>    <P>      ]]></body>
<body><![CDATA[<P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">REACCIONES  ADVERSAS</FONT></B> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">El  FVIIar es un agente con potente actividad procoagulante, por lo que te&oacute;ricamente  podr&iacute;a tener un riesgo potencial de desencadenar eventos tromboemb&oacute;licos.  Sin embargo, los datos acumulados en m&aacute;s de 1 000 pacientes no hemof&iacute;licos,  obtenidos de varios estudios, demuestran que no existe diferencia significativa  en cuanto al desarrollo de trombosis entre pacientes tratados con FVIIar y aquellos  en que se administr&oacute; un placebo.<SUP>6</SUP> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Los  resultados obtenidos en una serie de pacientes mostraron una incidencia de eventos  tromb&oacute;ticos entre el 1 y el 2 % de los pacientes tratados con el producto.  Es importante se&ntilde;alar que en la mayor&iacute;a de los casos estaban presentes  otros factores de riesgo que podr&iacute;an tener alguna influencia en el desarrollo  de complicaciones tromb&oacute;ticas.<SUP>81</SUP> Estos resultados apoyan el  criterio de que pacientes con alteraciones de la hemostasia, sin otro factor de  riesgo tromb&oacute;tico asociado, tienen una menor tendencia a los eventos tromboemb&oacute;licos  con la administraci&oacute;n de FVIIar que aquellos que presentan otros trastornos  que propicien estas complicaciones, tales como diabetes mellitus, obesidad y enfermedad  cardiovascular.<SUP>82</SUP> Se ha demostrado que el desarrollo de trombosis no  est&aacute; relacionado con la dosis utilizada.<SUP>34</SUP> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Por  otra parte, la presencia de inhibidores del FVII solo ha sido observada en pacientes  con d&eacute;ficit cong&eacute;nito de FVII.<SUP>68</SUP> </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Los  efectos adversos leves como dolor en el sitio de la infusi&oacute;n, cefalea,  v&oacute;mitos, fiebre y reacciones cut&aacute;neas por hipersensibilidad al producto,  son extremadamente raros. </FONT>    <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">A  modo de conclusi&oacute;n, puede considerarse que el concentrado de FVIIar no  es un tratamiento de primera l&iacute;nea en casos con manifestaciones hemorr&aacute;gicas  graves y que solo debe ser utilizado en pacientes rescatables con hemorragia masiva,  cuando la terap&eacute;utica inicial con remplazo de productos de la sangre y  medidas quir&uacute;rgicas apropiadas han fracasado en controlar el sangramiento.</FONT>    <P>    <P>    <P>      <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><B><FONT SIZE="3">REFERENCIAS  BIBLIOGR&Aacute;FICAS</FONT></B></FONT>     ]]></body>
<body><![CDATA[<!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">1.  Hedner V, Kisiel W. Use of human factor VIIa in the treatment <FONT  COLOR="#000000">of two hemophilia A patients with high-titer inhibitors</FONT>.  J Clin Invest 1983;71:1836-41. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">2.  Hedner V, Glazer S, Pingel K, Alberts KA, Blomback M, et al. Succesful use of  recombinant factor VIIa in a patient with severe hemophilia A during synovectomy.  Lancet 1988;2:1193. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">3.  Lusher JM, Roberts HR, Davignon G, Joist JH, Smith H, et al. A randomized, double-blind  comparison of two storage levels of recombinant factor VIIa in the treatment of  joint, muscle and mucocutaneous haemorrhages in persons with haemophilia A and  B with and without inhibitors. rFVIIa study group. Haemophilia 1998;4:790-8. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">4.  Weiskopf RB. Recombinant-activated coagulation factor VIIa (Novo Seven&#174;):  Current development. Vox Sang 2007;92:281-8. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">5.  Vlot JA, Ton E, Machaag AJC, Kramer MHH, Gaillard CAJ. Treatment of a severely  bleeding patient without preexisting coagulopathy with activated recombinant factor  VII. Am J Med 2000;108:421-2. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">6.  Marhnowitz V, Michaelson M. The Israeli multidisciplinary rFIIa task forc&eacute;.  Guidelines for the use of recombinant activated factor VII (r FVIIa) in uncontrolled  bleeding: A report by the Israeli multidisciplinary rFVIIa task force. J Thromb  Haemost 2005;3:640-8. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">7.  Hedner V. 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Monitoring coagulation and the clinical effects  of recombinant factor VIIa. Semin Hematol 2004;41:20-4. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">81.  Levi M. Safety of recombinant factor VIIa. TATM 2003;5:11-4. </FONT>    <!-- ref --><P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">82.  Hedner V. Mechanism of action, development and clinical experience of recombinant  FVIIa. J Biotechnol 2006;124:747-57.</FONT>    <P>    <P>    <P>    <P>    <P>     <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">Recibido:  28 de enero de 2010.    <BR>Aprobado: 2 de febrero de 2010.</FONT>    ]]></body>
<body><![CDATA[<P>    <P>    <P>    <P>    <P>      <P>     <P><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2">DraC. <I>Delfina  Almagro V&aacute;zquez</I>. Instituto de Hematolog&iacute;a e Inmunolog&iacute;a.  Apartado 8070, CP 10800. Ciudad de La Habana, Cuba. Tel (537) 643 8695, 643 8268,  Fax (537) 644 2334. e-mail: <U><FONT  COLOR="#0000ff"><A HREF="mailto:ihidir@hemato.sld.cu">ihidir@hemato.sld.cu</A></FONT></U>  <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>       ]]></body><back>
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