<?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>0034-7523</journal-id>
<journal-title><![CDATA[Revista Cubana de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[Rev cubana med]]></abbrev-journal-title>
<issn>0034-7523</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75231995000300008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Síndrome antifosfolípido: aspectos diagnósticos y terapéuticos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buchaca Faxas]]></surname>
<given-names><![CDATA[Emilio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Váquez]]></surname>
<given-names><![CDATA[Juan C.]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Clinicoquirúrgico Hermanos Ameijeiras  ]]></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>1995</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>1995</year>
</pub-date>
<volume>34</volume>
<numero>3</numero>
<fpage>187</fpage>
<lpage>194</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75231995000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75231995000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75231995000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El síndrome antifosfolípido, descrito inicialmente en el lupus eritematoso sistémico, aparece también en personas que no reúnen criterios de alguna enfermedad conocida, por lo que su identificación y tratamiento adquieren gran importancia en personas con fenómenos trombóticos aparentemente inexplicables y en mujeres con abortos y muertes fetales recurrentes sin otra causa reconocible. Su diagnóstico se hace en presencia de trombosis arterial, trombosis venosa, abortos o muertes fetales recurrentes, trombocitopenia y positividad de cualesquiera de las pruebas que detectan anticuerpos antifosfolípidos. Se hace una revisión de sus manifestaciones clínicas mayores y menores. Se resalta que la anticoagulación ante fenómenos trombóticos debe realizarse de forma indefinida, y que las mujeres embarazadas con anticuerpos antifosfolípidos deben ser tratadas desde su inicio para evitar el aborto o la muerte fetal.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[LUPUS ERITEMATOSO SISTEMICO]]></kwd>
<kwd lng="es"><![CDATA[LUPUS ERITEMATOSO SISTEMICO]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <H3> Temas Actualizados</H3>   Hospital Clinicoquir&uacute;rgico "Hermanos Ameijeiras"   <H2>   S&iacute;ndrome antifosfol&iacute;pido: aspectos diagn&oacute;sticos y   terap&eacute;uticos</H2>   <I>Dr. Emilio Buchaca Faxas<SUP>1</SUP> y Dr. Juan C. Rodr&iacute;guez   V&aacute;quez<SUP>2</SUP></I>   <OL>       <LI>   Especialista de I Grado en Medicina Interna. Instructor. Jefe del Servicio   de Medicina Interna.</LI>          <LI>   Especialista de I Grado en Medicina Interna.</LI>       </OL>      <H4>   RESUMEN</H4>   El s&iacute;ndrome antifosfol&iacute;pido, descrito inicialmente en el lupus eritematoso  sist&eacute;mico, aparece tambi&eacute;n en personas que no re&uacute;nen criterios  de alguna enfermedad conocida, por lo que su identificaci&oacute;n y tratamiento  adquieren gran importancia en personas con fen&oacute;menos tromb&oacute;ticos  aparentemente inexplicables y en mujeres con abortos y muertes fetales recurrentes  sin otra causa reconocible. Su diagn&oacute;stico se hace en presencia de trombosis  arterial, trombosis venosa, abortos o muertes fetales recurrentes, trombocitopenia  y positividad de cualesquiera de las pruebas que detectan anticuerpos antifosfol&iacute;pidos.  Se hace una revisi&oacute;n de sus manifestaciones cl&iacute;nicas mayores y menores.  Se resalta que la anticoagulaci&oacute;n ante fen&oacute;menos tromb&oacute;ticos  debe realizarse de forma indefinida, y que las mujeres embarazadas con anticuerpos  antifosfol&iacute;pidos deben ser tratadas desde su inicio para evitar el aborto  o la muerte fetal.      <P><I>Palabras clave:</I> LUPUS ERITEMATOSO SISTEMICO/diagn&oacute;stico; LUPUS    ERITEMATOSO SISTEMICO/terapia.  <H4>   INTRODUCCION</H4>   Entre los a&ntilde;os 1983 y 1986, en la literatura mundial comenzaron   a aparecer trabajos que relacionaron la aparici&oacute;n de fen&oacute;menos   tromb&oacute;ticos arteriales y venosos, abortos recurrentes y trombocitopenia   con la presencia de autoanticuerpos dirigidos contra fosfol&iacute;pidos   de carga negativa en las membranas celulares.1 Denominado inicialmente   como s&iacute;ndrome anticardiolipina2 y, posteriormente, como s&iacute;ndrome   antifosfol&iacute;pido (SAF),3 este conjunto de signos y s&iacute;ntomas   fue encontrado en pacientes con lupus eritematoso sist&eacute;mico (LES).4   Aunque hasta el presente la mayor incidencia de estos anticuerpos y donde   mejor se ha estudiado su asociaci&oacute;n con las manifestaciones cl&iacute;nicas   es el LES,5,6 tambi&eacute;n se ha reportado en otras enfermedades autoinmunes,7-9   infecciones,10 neoplasias,11 tratamiento con f&aacute;rmacos12 e incluso,   en personas que no llegan a reunir criterios de alguna enfermedad conocida,   entonces se designa como s&iacute;ndrome antifosfol&iacute;pido primario   (SAP).13-16          <P>La necesidad de identificar esta entidad en personas con fen&oacute;menos   tromb&oacute;ticos aparentemente inexplicables, as&iacute; como en mujeres   con abortos y muertes fetales recurrentes sin otra causa reconocible, requiere   una considerable atenci&oacute;n,17,18 por lo que hacemos esta revisi&oacute;n   de los elementos de actualidad en diagn&oacute;stico y tratamiento.   <H4>   DIAGNOSTICO</H4>   La mayor&iacute;a de los autores consideran s&iacute;ndrome antifosfol&iacute;pido   (SA) a la presencia de trombosis arterial y/o venosa, abortos o muertes   fetales a repetici&oacute;n y trombocitopenia (como manifestaciones aisladas   o combinadas en presencia de la positividad de cual quiera de las pruebas   que detectan anticuerpos antifosfol&iacute;pidos (AAF), al menos en 2 determinaciones,   con intervalo superior a 8 semanas.19-21          <P>Los AAF pueden ser identificados mediante 3 m&eacute;todos diferentes:   <OL>       <LI>   Serolog&iacute;a para s&iacute;filis falsamente positiva.</LI>          <LI>   Anticoagulante l&uacute;pico (AL).</LI>          <LI>   Anticuerpos anticardiolipina (AA).</LI>       ]]></body>
<body><![CDATA[</OL>      <H4>   PRUEBA PARA DETECTAR LOS AAF</H4>      <H4>   SEROLOGIA PARA SIFILIS FALSAMENTE POSITIVA</H4>   La prueba serol&oacute;gica est&aacute;ndar no trepon&eacute;mica para   detectar s&iacute;filis (VDRL) consiste en una floculaci&oacute;n en suspensi&oacute;n   que utiliza como substrato antig&eacute;nico un compuesto fosfolip&iacute;dico   formado por cardiolipina-colesterol-leutina. Desde 1941 se reconoce como   cardiolipina a un fosfol&iacute;pido obtenible de coraz&oacute;n de buey   que sirve como substrato antig&eacute;nico para detectar dichos anticuerpos.   La positividad del VDRL con pruebas trepon&eacute;micas negativas es un   indicador indirecto de AAF.20 Este falso positivo siempre lo es a t&iacute;tulo   bajo (&lt; 1/8), mientras que en la s&iacute;filis (reagina lu&eacute;tica   presente) se detecta a t&iacute;tulo alto.22   <H4>   ANTICOAGULANTE LUPICO</H4>   El anticoagulante l&uacute;pico (AL) es un grupo heterog&eacute;neo de   autoanticuerpos del tipo IgG o IgM dirigido contra fosfol&iacute;pidos   cargados negativamente que intervienen en la coagulaci&oacute;n.20 Se sospecha   la presencia de AL ante la prolongaci&oacute;n del tiempo parcial de tromboplastina   activado (TPTA) en 6-10 segundos con respecto al control, no se corrige   al agregar plasma normal,23,24 lo que hace excluir el d&eacute;ficit de   factores.          <P>La potencia del AL puede expresar se como la raz&oacute;n entre el TPTA   del paciente y el del control, o como la m&aacute;xima diluci&oacute;n   del plasma del enfermo que es capaz de prolongar el TPTA.23 Otras t&eacute;cnicas   para determinar AL son la prueba de <I>Exner</I>,24 el tiempo de inhibici&oacute;n   de la tromboplastina h&iacute;stica, la prueba de veneno de serpiente de   Russel y la prueba de saturaci&oacute;n con fosfol&iacute;pidos plaquetarios.25   <H4>   ANTICUERPOS ANTICARDIOLIPINA</H4>   En los &uacute;ltimos a&ntilde;os ya se pueden detectar de forma directa   los anticuerpos anticardiolipina (ACA) mediante radioinmunoensayo (RIA),26   y, m&aacute;s recientemente, por enzimoinmunoensayo (ELISA);27 estos m&eacute;todos   tienen la ventaja de ser m&aacute;s r&aacute;pidos, estandariza bles, cuantificables   y adem&aacute;s, discriminan la naturaleza de los anticuerpos (IGG y/o   IgM).20 La reciente asociaci&oacute;n de t&iacute;tulos altos o moderados   persistentes de IgG con los fen&oacute;menos tromb&oacute;ticos le confiere   gran importancia a la prueba.5          <P>Se ha observado cierta correlaci&oacute;n entre la presencia de VDRL   falsa positiva, AL y AA, si bien pueden hallarse de forma independiente.28   <H4>   MANIFESTACIONES CLINICAS</H4>   Los AAF han sido relacionados con un conjunto de manifestaciones cl&iacute;nicas   clasificadas como mayores y menores.21 Las 4 manifestaciones mayores son:   los fen&oacute;menos tromb&oacute;ticos arteriales, fen&oacute;menos tromb&oacute;ticos   venosos, abortos o muertes fetales recurrentes y trombocitopenia. Las manifestaciones   menores son: las que aparecen con menos frecuencia pero que tambi&eacute;n   se asocian a los AAF; entre las m&aacute;s relevantes se encuentran las   neurol&oacute;gicas, las cut&aacute;neas, la lesi&oacute;n valvular card&iacute;aca   y la anemia hemol&iacute;tica.   <H4>   MANIFESTACIONES MAYORES</H4>   El principal rasgo asociado al SAF son las trombosis, tanto arterial como   venosa, lo cual se distingue de otros muchos trastornos por hipercoagulabili   dad.5 Esta trombosis intravascular se expresa cl&iacute;nicamente en forma   de episodios recurrentes y las manifestaciones cl&iacute;nicas dependen   del territorio afectado.29          <P>El territorio arterial mas implicado es el intracraneal, se hace evidente   por ataques transitorios de isquemia (ATI) o estableciendo &aacute;reas   de infartos &uacute;nicos o m&uacute;ltiples, lo cual puede, incluso, evolucionar   a demencia multiinfarto.30,31          <P>Las trombosis intracard&iacute;acas,1 el infarto del miocardio,32 la   hipertensi&oacute;n pulmonar,33 la trombosis de la arteria mesent&eacute;rica,34   la necrosis avascular de la cadera35 y la enfermedad de Addison por trombosis   adrenal,36 han sido reportados como parte del fen&oacute;meno tromb&oacute;tico   del SAF. Los vasos arteriales perif&eacute;ricos y los distales pueden   afectar se y producir gangrena.37          <P>En el sistema venoso predominan las localizaciones profundas y superficiales   de los miembros inferiores con tromboembolismo pulmonar asociado o sin   &eacute;l.38 Tambi&eacute;n hay casos reportados con trombosis en las venas   subclavia y axilar,39 vena suprahep&aacute;tica (s&iacute;ndrome de Budd-Chari),40   vena renal,41 porta,42 vena central de la retina,43,44 y enferme dad venooclusiva   hep&aacute;tica.45 Los abortos y muertes fetales a repetici&oacute;n son   expresi&oacute;n del fen&oacute;meno tromb&oacute;tico e isqu&eacute;mico   a nivel placentario que, por lo regular, comienza desde las etapas m&aacute;s   tempranas del embarazo.46 Las p&eacute;rdidas fetales por esta causa pueden   ocurrir en cualquier per&iacute;odo del embarazo47 y su frecuencia se estima   en el 96 % de las mujeres con AAF.48          <P>La trombocitopenia rara vez es inferior a 50 000 y casi nunca da lugar   a manifestaciones cl&iacute;nicas.49 El mecanismo responsable de la inducci&oacute;n   de AAF es a&uacute;n un enigma.1 La trombosis y la trombocitopenia no tienen   un mecanismo que las explique claramente, pero su asociaci&oacute;n cl&iacute;nica   con los AAF es evidente, lo que se ha hecho dependiente de la reactividad   plaquetaria y endotelial.50 Se supone que estos anticuerpos tambi&eacute;n   act&uacute;en sobre componentes intr&iacute;nsecos de la coagulaci&oacute;n   tales como la prote&iacute;na C, la prote&iacute;na S y la protrombina.1   Recientemente se ha encontrado la participaci&oacute;n de una B2 glucoprote&iacute;na   como cofactor necesario para que los AAF activen las plaquetas.51 Las plaquetas   tambi&eacute;n pueden ser afectadas por inmunocomplejos y autoanticuerpos   para superficies glucoproteicas de forma similar a como ocurre en la cl&aacute;sica   p&uacute;rpura trombocito p&eacute;nica inmunol&oacute;gica. La anemia   hemol&iacute;tica se puede explicar por este mecanismo.1,3,52   <H4>   MANIFESTACIONES MENORES</H4>   Estad&iacute;sticamente se le ha encontrado asociaci&oacute;n con los AAF,   pero no hay un mecanismo patog&eacute;nico que lo explique con claridad.   Aunque no forman parte de los criterios diagn&oacute;sticos del s&iacute;ndrome,   estas manifestaciones a&uacute;n contin&uacute;an descubri&eacute;ndose.          <P>Las manifestaciones neurol&oacute;gicas reportadas con mayor frecuencia   son: epilepsia,53 migra&ntilde;a,54 corea55 y mielitis transversa.56          <P>Las manifestaciones cut&aacute;neas incluyen livedo reticular,57 fen&oacute;meno   de Raynaud,58 &uacute;lceras cut&aacute;neas no relacionadas con insuficiencia   venosa y lesiones maculares o nodulares que remedan vasculitis.59          <P>La asociaci&oacute;n de livedo reticularis (LVR), hipertensi&oacute;n   arterial (HTA) y accidente vascular encef&aacute;lico (AVE) se conoce como   s&iacute;ndrome de Sneddon;60 actualmente se considera como un subtipo   del SAP pues estos pacientes presentaban una alta incidencia de AAF.61   La hipertensi&oacute;n arterial, por su parte, puede aparecer en pacientes   con AAF sin la cl&aacute;sica nefritis del LES, hasta el momento no se   ha aclarado su mecanismo de producci&oacute;n.4          ]]></body>
<body><![CDATA[<P>La lesi&oacute;n valvular card&iacute;aca se presenta como insuficiencia   card&iacute;aca, la v&aacute;lvula mitral y la a&oacute;rtica son las m&aacute;s   afectadas por orden de frecuencia.62-65          <P>Tambi&eacute;n se ha descrito, en estos pacientes la anemia hemol&iacute;tica   con prueba de Coombs positiva.3   <H4>   TRATAMIENTO</H4>   Las bases del tratamiento en estos pacientes no est&aacute;n todav&iacute;a   establecidas, a&uacute;n existen controversias.23 El trata miento profil&aacute;ctico   en aquellas personas que tienen AAF sin manifestaci&oacute;n cl&iacute;nica   no est&aacute; indicado, pues s&oacute;lo el 30 % de ellos van a desarrollar   el s&iacute;ndrome.66 Los fen&oacute;menos tromb&oacute;ticos tanto arteriales   como venosos son indicaci&oacute;n de tratamiento anticoagulante. La duraci&oacute;n   del tratamiento debe ser la indicada habitualmente para dicho fen&oacute;meno   tromb&oacute;tico, aunque algunos autores sugieren que sea indefinido para   prevenir las recurrencias, ya que est&aacute;n descritas cuando se retira   la anticoagulaci&oacute;n.67 En los pacientes con fen&oacute;menos tromb&oacute;ticos,   a pesar del tratamiento anticoagulante, se ha recomendado el tratamiento   inmunosupresor asociado.22          <P>No est&aacute; claro el papel que pueden desempe&ntilde;ar los esteroides,   inmunosupresores y recambio plasm&aacute;tico, pues aunque capaces de bajar   los niveles de los AAF, al retirarlos, suelen volver a elevarse los t&iacute;tulos.22   Tampoco est&aacute; claro el papel de los antiagregantes plaquetarios en   la prevenci&oacute;n de estos fen&oacute;menos, pero algunos autores recomiendan   el dipiridamol.66          <P>Con el prop&oacute;sito de evitar la recurrencia en pacientes con eventos   tromb&oacute;ticos cerebrales, est&aacute; recomendado el uso simult&aacute;neo   de heparina y esteroides asociados a azatioprina o ciclofosfamida.68          <P>En toda embarazada con positividad de AAF se debe evitar el aborto o   muerte fetal con el uso de peque&ntilde;as dosis diarias de &aacute;cido   acetil salic&iacute;lico (ASA) desde los primeros momentos de la gestaci&oacute;n.   La dosis diaria indicada seg&uacute;n diferentes autores puede ser 75 mg,3   o 100 mg.69 Si hay historia previa de trombosis, abortos o muerte fetal,   est&aacute; recomendado el uso simult&aacute;neo de ASA y prednisona en   dosis diaria oral de 40 mg70 o de ASA y heparina subcut&aacute;nea 10 000   uds en 2 subdosis diarias.71 Tambi&eacute;n se han reportado otras modalidades   de trata miento, tales como: recambio plasm&aacute;tico,72 y uso de inmunoglobulinas   intravenosas a altas dosis.73   <H4>   REFERENCIAS BIBLIOGRAFICAS</H4>      <OL>       <!-- ref --><LI>   Hughes GRV. The antiphospholipid syndrome: ten years on. Lancet 1993;342:341-4.</LI>    <LI>   Hughes GRV, Harris EN, Gharavi AE. The anticardiolipin syndrome. J Rheumatol   1986;13: 486-9.</LI>          <LI>   Khamashta MA, Hughes GRV. Antiphospholipid syndrome: a common cause of   thrombosis. BMJ 1993;307:883-4.</LI>          <LI>   Asherson RA, Harris EN. Anticardiolipin antibodies: clinical associations.   Postgrad Med J 1986;62:1081-87.</LI>          <LI>   Petri M, Rheinschmidt M, Whriting-O Keefe Q, Hellman D, Corash L. The frecuency   of lupus anticoagulant in systemic lupus erytematosus. Ann Intern Med 1987;106:524-31.</LI>          ]]></body>
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