<?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>S0034-75232008000100008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Debería ser considerado el síndrome antifosfolípido un nuevo factor de riesgo cardiovascular]]></article-title>
<article-title xml:lang="en"><![CDATA[Should the antiphospholipid syndrome be considered as a new cardiovascular risk factor]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Padrón]]></surname>
<given-names><![CDATA[María Virginia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[Wilfredo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Padracuten]]></surname>
<given-names><![CDATA[Enrique Ivo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mérida Álvarez]]></surname>
<given-names><![CDATA[Oyantay]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Clinicoquirúrgico Hermanos Ameijeiras  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2008</year>
</pub-date>
<volume>47</volume>
<numero>1</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75232008000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75232008000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75232008000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El síndrome antifosfolípido es un estado trombofílico por la presencia en sangre de anticuerpos dirigidos contra el complejo protrombina-fosfolípidos o contra factores de la coagulación-fosfolípidos que afectan la conversión de la primera en trombina y la activación de los segundos. Se hizo esta revisión para dar respuesta a la interrogante de si el síndrome antifosfolípido debería ser considerado un nuevo factor de riesgo cardiovascular, señalar los mecanismos de producción de las trombosis, los nuevos criterios diagnósticos del síndrome y describir las afecciones que produce al nivel del endotelio coronario y del endocardio valvular y mural. Se concluyó que el síndrome antifosfolípido SÍ debería ser considerado como un nuevo factor de riesgo cardiovascular porque los anticuerpos antifosfolípidos son capaces de generar un riesgo de afecciones cardíacas al nivel del endocardio y provocar insuficiencias, estenosis valvulares y trombosis murales intracavitarias. Los anticuerpos antifosfolípidos al nivel del endocardio valvular y mural provocan transformaciones que los convierten en una fuente disparadora de émbolos sistémicos y pulmonares, estos anticuerpos al nivel del endotelio coronario pueden inducir síndromes coronarios agudos con elevación del ST y sin ella, así como ocluir los puentes revascularizados y dispositivos intracoronarios. Los anticuerpos antifosfolípidos al nivel del endotelio de la microcirculación pueden desencadenar microtrombosis o trombosis de ramas pulmonares medianas y grandes, y provocar secundariamente una hipertensión pulmonar, también pueden desarrollar aterosclerosis intracoronaria y ayudar a desencadenar una cardiopatía isquémica crónica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The antiphospholipid syndrome is a thrombophilic state due to the presence in blood of antibodies directed against the prothrombin-phospholipid complex or against clotting factors-phospholipids affecting the conversion of the first one into thrombin and the activation of the second. A review was made to know if the antiphospholipid syndrome should be considered as a new cardiovascular risk factor, to determine the mechanisms of production of thrombosis, the new diagnostic criteria of the syndrome, and to describe the affections it produces at the level of the coronary endothelium and of the valvular and mural endocardium. It was concluded that the antiphospholipid syndrome should be considered as a new cardiovascular risk factor, since the antiphospholipid antibodies are able to generate a risk for heart affections at the endocardium level and to cause insufficiencies, valvular stenoses and intracavitary mural thrombosis. The antiphospholipid antibodies at the level of the valvular and mural endocardium produce transformations that turn them into a triggering source of systemic and pulmonary emboli. These antibodies at the level of the coronary endothelium may induce acute coronary syndromes with elevation of ST and without it, as well as to occlude the revascularized bridges and intracoronary devices. The antiphospholipid antibodies at the level of the microcirculation endothelium may trigger microthrombosis or thrombosis of the middle and large pulmonary branches, and secondarily provoke pulmonary hypertension. They can also develop intracoronary atherosclerosis and help to trigger chronic ischemic heart disease.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Síndrome antifosfolípido]]></kwd>
<kwd lng="es"><![CDATA[anticuerpos antifosfolípidos]]></kwd>
<kwd lng="es"><![CDATA[trombosis coronaria]]></kwd>
<kwd lng="es"><![CDATA[insuficiencia y estenosis valvulares]]></kwd>
<kwd lng="en"><![CDATA[Antiphospholipid syndrome]]></kwd>
<kwd lng="en"><![CDATA[antiphospholipid antibodies]]></kwd>
<kwd lng="en"><![CDATA[coronary thrombosis]]></kwd>
<kwd lng="en"><![CDATA[insufficiency and valvular stenosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="right"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>TEMAS    ACTUALIZADOS</b></font> </div>     <p align="left">&nbsp;</p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b>&iquest;Deber&iacute;a    ser considerado el s&iacute;ndrome antifosfol&iacute;pido un nuevo factor de    riesgo cardiovascular?</b></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>Should    the antiphospholipid syndrome be considered as a new cardiovascular risk factor?</b></font></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Mar&iacute;a    Virginia G&oacute;mez Padr&oacute;n<sup>I</sup>; Wilfredo Torres<sup>II</sup>;    Enrique Ivo G&oacute;mez Padr&oacuten<sup>III</sup>; Oyantay M&eacute;rida &Aacute;lvarez<sup>IV</sup>    </b></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><sup>I</sup>Especialista    de II Grado en Cardiolog&iacute;a. Especialista de I Grado en MGI. Profesor    Auxiliar. Hospital Clinicoquir&uacute;rgico &quot;Hermanos Ameijeiras&quot;.    La Habana, Cuba.    <br>   <sup>II</sup>Doctor en Ciencias. Especialista de II Grado en Hematolog&iacute;a.    Profesor Titular. Hospital Clinicoquir&uacute;rgico &quot;Hermanos Ameijeiras&quot;.    La Habana, Cuba.    ]]></body>
<body><![CDATA[<br>   <sup>III</sup>Doctor en Ciencias. Especialista de II Grado en Anatom&iacute;a    Humana. Profesor Titular. Hospital Clinicoquir&uacute;rgico &quot;Hermanos Ameijeiras&quot;.    La Habana, Cuba.    <br>   <sup>IV</sup>Especialista de I Grado en Cardiologia. Instructor. Hospital Clinicoquir&uacute;rgico    &quot;Hermanos Ameijeiras&quot;. La Habana, Cuba.</font></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p> <hr size="1" noshade>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>RESUMEN</b>    </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El    s&iacute;ndrome antifosfol&iacute;pido es un estado trombof&iacute;lico por la presencia en sangre de anticuerpos dirigidos contra el complejo protrombina-fosfol&iacute;pidos    o contra factores de la coagulaci&oacute;n-fosfol&iacute;pidos que afectan la    conversi&oacute;n de la primera en trombina y la activaci&oacute;n de los segundos.    Se hizo esta revisi&oacute;n para dar respuesta a la interrogante de si el s&iacute;ndrome    antifosfol&iacute;pido deber&iacute;a ser considerado un nuevo factor de riesgo    cardiovascular, se&ntilde;alar los mecanismos de producci&oacute;n de las trombosis,    los nuevos criterios diagn&oacute;sticos del s&iacute;ndrome y describir las    afecciones que produce al nivel del endotelio coronario y del endocardio valvular    y mural. Se concluy&oacute; que el s&iacute;ndrome antifosfol&iacute;pido S&Iacute;    deber&iacute;a ser considerado como un nuevo factor de riesgo cardiovascular    porque los anticuerpos antifosfol&iacute;pidos son capaces de generar un riesgo    de afecciones card&iacute;acas al nivel del endocardio y provocar insuficiencias,    estenosis valvulares y trombosis murales intracavitarias. Los anticuerpos antifosfol&iacute;pidos    al nivel del endocardio valvular y mural provocan transformaciones que los convierten    en una fuente disparadora de &eacute;mbolos sist&eacute;micos y pulmonares,    estos anticuerpos al nivel del endotelio coronario pueden inducir s&iacute;ndromes    coronarios agudos con elevaci&oacute;n del ST y sin ella, as&iacute; como ocluir    los puentes revascularizados y dispositivos intracoronarios. Los anticuerpos    antifosfol&iacute;pidos al nivel del endotelio de la microcirculaci&oacute;n    pueden desencadenar microtrombosis o trombosis de ramas pulmonares medianas    y grandes, y provocar secundariamente una hipertensi&oacute;n pulmonar, tambi&eacute;n    pueden desarrollar aterosclerosis intracoronaria y ayudar a desencadenar una    cardiopat&iacute;a isqu&eacute;mica cr&oacute;nica. </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><strong>Palabras    clave</strong>: S&iacute;ndrome antifosfol&iacute;pido, anticuerpos antifosfol&iacute;pidos,    trombosis coronaria, insuficiencia y estenosis valvulares. </font></p>     <p align="left"></p>     <p align="left"></p> <hr size="1" noshade>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>ABSTRACT</b></font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">The    antiphospholipid syndrome is a thrombophilic state due to the presence in blood    of antibodies directed against the prothrombin-phospholipid complex or against    clotting factors-phospholipids affecting the conversion of the first one into    thrombin and the activation of the second. A review was made to know if the    antiphospholipid syndrome should be considered as a new cardiovascular risk    factor, to determine the mechanisms of production of thrombosis, the new diagnostic    criteria of the syndrome, and to describe the affections it produces at the    level of the coronary endothelium and of the valvular and mural endocardium.    It was concluded that the antiphospholipid syndrome should be considered as    a new cardiovascular risk factor, since the antiphospholipid antibodies are    able to generate a risk for heart affections at the endocardium level and to    cause insufficiencies, valvular stenoses and intracavitary mural thrombosis.    The antiphospholipid antibodies at the level of the valvular and mural endocardium    produce transformations that turn them into a triggering source of systemic    and pulmonary emboli. These antibodies at the level of the coronary endothelium    may induce acute coronary syndromes with elevation of ST and without it, as    well as to occlude the revascularized bridges and intracoronary devices. The    antiphospholipid antibodies at the level of the microcirculation endothelium    may trigger microthrombosis or thrombosis of the middle and large pulmonary    branches, and secondarily provoke pulmonary hypertension. They can also develop    intracoronary atherosclerosis and help to trigger chronic ischemic heart disease.</font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><strong>Key    words</strong>: Antiphospholipid syndrome, antiphospholipid antibodies, coronary    thrombosis, insufficiency and valvular stenosis.</font></p> <hr size="1" noshade>     <p align="left"></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><strong><font size="3" face="Verdana, Arial, Helvetica, sans-serif">INTRODUCCI&Oacute;N</font></strong></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El    s&iacute;ndrome antifosfol&iacute;pido (SAF), tambi&eacute;n conocido como &quot;s&iacute;ndrome    de Hughes&quot;, en honor al Dr. Gram. RV Hughes (quien lo describi&oacute;    por primera vez en 1983) es una enfermedad rara, sist&eacute;mica y de caracter&iacute;sticas    autoinmunes, que provoca un estado trombof&iacute;lico por la presencia en sangre    de anticuerpos dirigidos contra el complejo protrombina-fosfol&iacute;pidos    o contra factores de la coagulaci&oacute;n-fosfol&iacute;pidos que afectan    la conversi&oacute;n de la primera en trombina y la activaci&oacute;n de los    segundos.</font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El    primer anticuerpo antifosfol&iacute;pido fue descubierto en 1906 en pacientes    con s&iacute;filis<sup>1,2</sup> aunque solo muchos a&ntilde;os despu&eacute;s    se identific&oacute; la cardiolipina (un fosfol&iacute;pido mitocondrial) como    el ant&iacute;geno m&aacute;s importante en el SAF. En 1983 se desarroll&oacute;    un inmunoensayo para la detecci&oacute;n de anticuerpos anticardiolipinas y    se encontr&oacute; una fuerte correlaci&oacute;n entre los anticuerpos asociados    al lupus eritematoso sist&eacute;mico (LES) y las trombosis,<sup>3</sup> entonces    se clasific&oacute; como SAF primario al que no estaba relacionado con el LES    y al que estaba asociado al LES se le llam&oacute; SAF secundario.</font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Hacia    1990, 2 grupos independientes descubrieron que algunos anticuerpos anticardiolipinas    necesitan de la presencia de una prote&iacute;na plasm&aacute;tica denominada    B2 glicoprote&iacute;na i o apoprote&iacute;na H para fijarse a los fosfol&iacute;pidos    ani&oacute;nicos e inhibir la v&iacute;a intr&iacute;nseca de las plaquetas.<sup>4</sup>    Los anticuerpos anticardiolipinas, al necesitar de este cofactor, interfieren    con las acciones de la B2 glicoprote&iacute;na I, que es un anticoagulante natural,    favoreciendo los fen&oacute;menos tromb&oacute;ticos. La trombocitopenia es    frecuente en el SAF, pero no tan severa como para producir hemorragias.<sup>5-10</sup>    Los anticuerpos cl&iacute;nicamente relevantes se clasifican en 3 subgrupos:</font></p>     <blockquote>        ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Anticuerpo      anticoagulante l&uacute;pico.</font></p>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Anticuerpos      anticardiolipinas.</font></p>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Anticuerpo      anti B2 glicoprote&iacute;na I. </font></p> </blockquote>     <p align="left">&nbsp;</p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>MECANISMOS    CELULARES Y MOLECULARES DE PRODUCCI&Oacute;N DE LAS TROMBOSIS EN LOS PACIENTES    CON SAF</b></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los    anticuerpos antifosfol&iacute;pidos (AcAF) producen da&ntilde;o al endotelio    vascular porque aumentan la captaci&oacute;n de las LDLs oxidadas por macr&oacute;fagos.    </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los    AcAF modulan las prote&iacute;nas que se fijan a los fosfol&iacute;pidos como    la B2 glicoprote&iacute;na I.<sup>4,5</sup> Se ha demostrado <em>in vitro</em> que los    AcAF, al incrementar la actividad endotelial, interfieren con la liberaci&oacute;n    de prostaciclina e incrementan la producci&oacute;n de mol&eacute;culas de adhesi&oacute;n    y citoquinas, adem&aacute;s aumentan el factor de activaci&oacute;n plaquetaria    y la actividad del factor h&iacute;stico. Tambi&eacute;n se sugiere que inhiben    la liberaci&oacute;n del activador del plasmin&oacute;geno e incrementan al    inhibidor del activador del plasmin&oacute;geno, adem&aacute;s interfirieren    con el sistema de la prote&iacute;na C y S del endotelio y la trombomodulina    dependiente.<sup>6</sup>    <br> </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se    ha descrito la interacci&oacute;n de los AcAF con la anexina V (prote&iacute;na    I anticoagulante placentaria), lo cual provoca cambios tromb&oacute;ticos,<sup>11,12</sup>    su ausencia conduce a una insuficiencia placentaria, con abortos espont&aacute;neos    de m&aacute;s de 10 sem, partos prematuros, muertes fetales inexplicadas y crecimiento    intrauterino retardado.<sup>13-16</sup>    <br>   </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La    activaci&oacute;n por los AcAF del factor de necrosis tumoral alfa conduce a    un estado protromb&oacute;tico y proinflamatorio que puede desencadenar las    trombosis.<sup>17</sup> En enfermedades infecciosas se ha descrito la activaci&oacute;n    de AcAF con complicaciones de embolia pulmonar.<sup>18</sup>    <br> </font></p>     <p align="left">    <br>   <b><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Diagn&oacute;stico    positivo del SAF</font></b></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Inicialmente,    se planteaban los criterios de SAF descritos por los grupos de Harris<sup>5,19</sup>    y Alarc&oacute;n Segovia,<sup>20-25</sup> pero en el &uacute;ltimo Consenso    Internacional de SAF de Sidney en abril del 2006, plantean que el paciente debe    cumplir como m&iacute;nimo con uno de los criterios cl&iacute;nicos y uno de    los criterios de laboratorio siguientes:<sup>26</sup></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>&middot;    </b>Criterios cl&iacute;nicos </font></p>     <blockquote>        <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Uno o m&aacute;s      episodios cl&iacute;nicos de cualquier forma de trombosis en cualquier tejido      u &oacute;rgano. </font></p>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Morbilidad      en el embarazo: 1 o m&aacute;s muertes de fetos normales de m&aacute;s de      10 sem, 1 o m&aacute;s partos prematuros de neonatos normales antes de las      34 sem, 3 o m&aacute;s abortos espont&aacute;neos antes de 10 sem sin causas      explicables.<sup>27-30</sup></font></p> </blockquote>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">    ]]></body>
<body><![CDATA[<br>   <b>&middot; </b>Criterios de laboratorio</font></p>     <blockquote>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Presencia de      AcAF como: anticoagulante l&uacute;pico (AL), anticuerpos anticardiolipinas      y anticuerpos anti-B2 glicoprote&iacute;na-I, presentes en plasma en 2 ocasiones      separadas por 12 sem.</font></p> </blockquote>     <p align="left">    <br>   <font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b><font size="2">Afecciones    del SAF al nivel del endocardio valvular y mural</font></b></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Existen    2 tipos de afecciones, los engrosamientos valvulares y las masas o vegetaciones    valvulares de 3 a 4 mm con una localizaci&oacute;n predominante sobre la porci&oacute;n    medial y proximal de la c&uacute;spide de las valvas de las v&aacute;lvulas<sup>31-35</sup>    que se asocian con m&aacute;s frecuencias a insuficiencias valvulares mientras    que las estenosis son muy raras, la v&aacute;lvula mitral es la m&aacute;s afectada    seguida por la v&aacute;lvula a&oacute;rtica, la presencia de afecciones en    las v&aacute;lvulas pulmonares y tric&uacute;spides son muy raras.<sup>31-36</sup>    Las lesiones valvulares pueden tener dep&oacute;sito de fibrina, neovascularizaci&oacute;n    y una extensi&oacute;n variable de inflamaci&oacute;n con infiltraci&oacute;n    de c&eacute;lulas mononucleres.<sup>37-42</sup> Existe mayor compromiso valvular    en los pacientes con SAF secundario a LES, en relaci&oacute;n con el SAF primario    y con la poblaci&oacute;n control,<sup>43-45</sup> sin embargo, la tercera parte    de los pacientes con SAF primario tienen m&aacute;s lesiones valvulares en relaci&oacute;n    con la poblaci&oacute;n general.<sup>46-48</sup> </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Muchos    casos de valvulopat&iacute;as por SAF est&aacute;n asociadas con alta frecuencia    de procesos emb&oacute;licos,<sup>49-53</sup> los m&aacute;s frecuentes son los    procesos isqu&eacute;micos cerebro vasculares como ataque transitorio de isquemia    (ATI) o accidentes vasculares encef&aacute;licos isqu&eacute;micos. </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En    un an&aacute;lisis del Grupo de Estudio de ICTUS y SAF, se demostr&oacute; que    el 22 % ten&iacute;a insuficiencia mitral; 2,8 % insuficiencia a&oacute;rtica;    9,7 % anormalidades en las paredes del ventr&iacute;culo izquierdo y en 4,2    % trombos en el ventr&iacute;culo izquierdo, por lo que estos resultados sugieren    un alto potencial de fuente cardioemb&oacute;lica en los pacientes con SAF.    </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las    alteraciones valvulares se relacionan con: inmunocomplejos, inmunoglobulinas,    complemento entre los vasos de las paredes del ventr&iacute;culo izquierdo,    entre la zona de neovascularizaci&oacute;n, y en el estroma del endocardio,    as&iacute; como, entre las vegetaciones de estos pacientes, lo cual demuestra    la evidencia de los AcAF adheridos a las c&eacute;lulas endoc&aacute;rdicas.<sup>54-56</sup></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><em>Pope</em>    y otros<sup>57-60</sup> demostraron una disminuci&oacute;n total del nivel de    complemento C3 y C4 de pacientes con SAF primarios y enfermedad valvular.    ]]></body>
<body><![CDATA[<br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">    <br>   <em>Tenedios</em> y otros, mediante marcadores de c&eacute;lulas endoc&aacute;rdicas,    demostraron que el dep&oacute;sito de AcAF inicia el proceso inflamatorio que    recluta complemento hacia la lesi&oacute;n valvular con la aparici&oacute;n    ulterior de un estado proinflamatorio, proadhesivo y procoagulante a este nivel.<sup>61</sup></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><em>Vega-Ostertag</em>  y <em>Casper</em><sup>62</sup> demostraron que los AcAF incrementan la transcripci&oacute;n, funci&oacute;n    y expresi&oacute;n del factor h&iacute;stico y la interleukina-8, adem&aacute;s    incrementan la expresi&oacute;n de la sintetasa de oxido n&iacute;trico a todos    los niveles de las c&eacute;lulas endoc&aacute;rdicas lo cual produce da&ntilde;os    al nivel de las valvas del endocardio. </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La    B2 glicoprote&iacute;na I est&aacute; adherida proteol&iacute;ticamente al dominio    de factor V por la actividad del factor X. La B2 glicoprote&iacute;na I muestra    afinidad por estos anticuerpos y al un&iacute;rseles modifican la prote&iacute;na    exponiendo los fosfol&iacute;pidos de la membrana a los factores de la coagulaci&oacute;n    incrementando la tendencia trombof&iacute;lica<sup>63</sup> al    nivel de todo el endocardio. </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Al    nivel del endocardio tambi&eacute;n se puede afectar el sistema de la conducci&oacute;n,    en las madres positivas de SAF con anticuerpos anti-Ro/SSA, estos anticuerpos    pueden provocar afecciones en el feto al nivel del sistema de la conducci&oacute;n    card&iacute;aco y tener hijo con bloqueos AV cong&eacute;nitos.<sup>64-66</sup></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b><font size="2">    <br>   Afecciones del SAF al nivel del endotelio coronario</font></b></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><em>Miesbach</em>  y <em>Mathias</em> han identificado un grupo heterog&eacute;neo de anticuerpos contra    la trombina en el 20 % de los pacientes con SAF, estos fueron los anticuerpos    antitrombina IgM e IgG. Estos anticuerpos se relacionaron con la presencia de    la B2 glicoprote&iacute;na I en el 96 % de los pacientes con SAF y ellos detectaron    que el 67 % de los pacientes con anticuerpos antitrombina IgG sufrieron trombosis    arteriales.<sup>64</sup>    <br> </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><em>Simoneimo</em>  y <em>Sapet</em> han demostrado que los AcAF IgG provocan la activaci&oacute;n de los      <em>Reactive oxygen species</em> (ROS), que son una especie de ox&iacute;genos reactivos    que act&uacute;a como segundo mensajero activando a la p38 MAPK que a su vez    estimula la transcripci&oacute;n del factor h&iacute;stico. Los ROS conducen    finalmente a un incremento de la exposici&oacute;n de mol&eacute;culas de adhesi&oacute;n    vascular endotelial,<sup>65</sup> favoreciendo secundariamente la trombosis    intracoronaria. </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Por    ejemplo, se ha demostrado que en el coraz&oacute;n de ratas con SAF hay aumento    de AcAF IgG e IgM, y disminuci&oacute;n de la actividad de la paraoxonasa (PON)    del &oacute;xido n&iacute;trico (NO) y aumento del estr&eacute;s oxidativo con elevaci&oacute;n    de los radicales libres de ox&iacute;geno como: el super&oacute;xido, el peroxinitrito    y la nitrotiroxina, los cuales aceleran el proceso ateroscler&oacute;tico<sup>66</sup>    que unidos a la tendencia trombof&iacute;lica pueden conducir a un s&iacute;ndrome    coronario agudo (SCA) en menores de 45 a&ntilde;os.<sup>67</sup> </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En    el SAF, puede presentarse cardiopat&iacute;a isqu&eacute;mica con infarto del    miocardio o sin &eacute;l, trombosis al nivel de la microcirculaci&oacute;n y oclusi&oacute;n    de puentes revascularizados, por los AcAF que afectan el balance oxidaci&oacute;n-antioxidaci&oacute;n    y provocan estr&eacute;s oxidativo. </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><em>Matsuura    Kobayash</em>i<sup>68</sup> muestran inmunocomplejos formados por OxiLDL/B2GPI, es    decir por la B2 glicoprote&iacute;na I, con la lipoprote&iacute;na de bajo peso    molecular oxidada, estas 2 estructuras forman inmunocomplejos circulantes que    han sido encontrados dentro de la lesi&oacute;n ateroscler&oacute;tica coronaria    junto a linfocitos inmunorreactivos, en los pacientes con SAF primario y secundario.    Estos inmunocomplejos tambi&eacute;n se han visto en el torrente circulatorio    de pacientes enfermos de SAF, LES, diabetes mellitus tipo 2 e insuficiencia    renal cr&oacute;nica (IRC). <em>David</em> y <em>Falco</em>,<sup>69</sup> plantean que el estr&eacute;s    oxidativo y la peroxidaci&oacute;n lip&iacute;dica en el SAF conducen a una    respuesta inflamatoria cr&oacute;nica a bajo grado que incrementa el riesgo    coronario y conlleva la activaci&oacute;n del tromboxano plaquetario que provoca    aumento del riesgo de trombosis arteriales.<em> Vaselini</em> y <em>Alessandri</em> recomiendan    el uso del tratamiento antioxidante en la prevenci&oacute;n de las trombosis    en este s&iacute;ndrome.<sup>70</sup></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><em>Buschmann</em>  y<em> Fischer</em><sup>71</sup> demostraron que AcAF activan a los complementos C3 y C5 produciendo    2 efectos, el de inducir la trombosis y el de activar las c&eacute;lulas endoteliales    coronarias. </font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><em>Morel</em>  y <em>Gesel</em>,<sup>72</sup> en pacientes con infarto del miocardio y SAF primario,    han detectado micropart&iacute;culas procoagulantes (MP) circulantes, relacionadas    con la estimulaci&oacute;n de c&eacute;lulas endoteliales y se las interpretaron    como marcadores pat&oacute;genos de incremento de la hipercoagulabilidad. Ellos,    por ejemplo, demostraron que las MP de plaquetas de origen endotelial vascular    est&aacute;n muy elevadas en los pacientes con infarto del miocardio y SAF (de    3 a 6 veces m&aacute;s que en los pacientes del grupo control), por lo que la    liberaci&oacute;n de MP puede contribuir al crecimiento y desarrollo de trombos    intracard&iacute;acos e intracoronarios.<sup>72</sup></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Existen    otros estudios en pacientes con s&iacute;ndrome coronario agudo y SAF hechos    por<em> Veres</em> y <em>Lakos</em><sup>73</sup> donde los anticuerpos antiB2 glicoprote&iacute;na I IgA    estuvieron significativamente m&aacute;s elevados en la angina inestable y en    el infarto agudo del miocardio, con elevaci&oacute;n del ST y SAF, que en los    s&iacute;ndromes coronarios agudos sin SAF; adem&aacute;s, se demostr&oacute;    mayor frecuencia de elevaci&oacute;n de los anticuerpos anti B2 GPT I isotipo    IgA en los hombres que en las mujeres y mucho m&aacute;s frecuente en los j&oacute;venes    que en los viejos.</font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los    estudios de infarto agudo del miocardio y SAF han demostrado el tratamiento    exitoso con intervencionismo coronario seguido con el uso de anticoagulaci&oacute;n    y antiagregaci&oacute;n.<sup>74,75</sup></font></p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se    concluye que el SAF s&iacute; deber&iacute;a comenzar a ser considerado como    un nuevo factor de riesgo cardiovascular porque los AcAF son capaces de generar    riesgo de afecciones card&iacute;acas al nivel del:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">I. Endocardio valvular    y mural:</font></p>     <blockquote>        ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1. Insuficiencias      y estenosis valvulares: dadas por engrosamientos, masas o vegetaciones que      provocan insuficiencias y/o estenosis valvulares.</font></p>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2. Trombosis      murales intracavitarias: en el endocardio mural se generan transformaciones      capaces de crear condiciones para trombos murales.</font></p>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3. Endocardio      valvular y mural: convertido en una fuente disparadora de embolismos sist&eacute;micos      y pulmonares.</font></p> </blockquote>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">II. Endotelio coronario:</font></p>     <blockquote>        <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1. S&iacute;ndromes      coronarios agudos con elevaci&oacute;n del ST y sin ella: porque los AcAF      producen una disfunci&oacute;n endotelial al:</font></p>       <blockquote>          <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Aumentar        la captaci&oacute;n de la LDL oxidada por los macr&oacute;fagos activados.</font></p>         <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Activar el        factor de necrosis tumoral alfa.</font></p>         <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Aumentar        el estr&eacute;s oxidativo y disbalance de la oxidaci&oacute;n-antioxidaci&oacute;n.        </font></p>         ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Disminuir        la actividad de la paraoxonasa (PON), del &oacute;xido n&iacute;trico (NO) y aumentar        el estr&eacute;s oxidativo y elevar los radicales libres de ox&iacute;geno.</font></p>         <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Activar los        complementos C3 y C5 produciendo 2 efectos, el de inducir la trombosis y        el de activar las c&eacute;lulas endoteliales coronarias.</font></p>         <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Producir        MP circulantes que incrementan la hipercoagulabilidad y desarrollan trombos        intracard&iacute;acos e intravasculares.</font></p>         <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Estimular        al factor de activaci&oacute;n plaquetaria y al factor h&iacute;stico conduciendo        a un incremento de adhesi&oacute;n endotelial.</font></p>         <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Inhibir al        activador del plasmin&oacute;geno e interferir en el sistema de la prote&iacute;na        C, la prote&iacute;na S y la trombomodulina.</font></p>   </blockquote>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2. Cardiopat&iacute;a      isqu&eacute;mica cr&oacute;nica: </font></p>       <blockquote>          <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Pueden provocar        aterosclerosis coronaria al evidenciarse inmunocomplejos oxiDLD/B2GPI, en        las placas ateromatosas intracoronarias de los pacientes con SAF.</font></p>         <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- El estr&eacute;s        oxidativo y la peroxidaci&oacute;n lip&iacute;dica en el SAF conducen a        una respuesta inflamatoria cr&oacute;nica y a bajo grado que conlleva la        activaci&oacute;n del tromboxano plaquetario aumentando el riesgo de trombosis        coronaria.</font></p>   </blockquote>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3. Hipertensi&oacute;n      pulmonar por SAF: producidos por trombosis de la microcirculaci&oacute;n pulmonar      que repercute provocando insuficiencia triscup&iacute;dea severa e insuficiencia      card&iacute;aca derecha.</font></p>       ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">4. Oclusi&oacute;n      de los puentes revascularizados y dispositivos intracoronarios.</font></p> </blockquote>     <p align="left">&nbsp;</p>     <p align="left"><b><font face="Verdana, Arial, Helvetica, sans-serif" size="3">REFERENCIAS    BIBLIOGR&Aacute;FICAS</font></b><font face="Verdana, Arial, Helvetica, sans-serif" size="2">    <br>   </font></p>     <!-- ref --><p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1.    Wassermann A, Neisser A, Bruck C. Eine serodiagnostiche reaktion bei syphilis.    Deutsche Med Wochenschr. 1906;32:745-6. </font><!-- ref --><p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2.    Pangborn MC. A new serologically active phospholipid from beefbei syphilis.    Deutsche Med Wochenschr. 1906;33:904-7. </font><!-- ref --><p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3.    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<body><![CDATA[<p align="left">&nbsp;</p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Recibido:    28 de febrero de 2008.    <br>   Aprobado: 17 de abril de 2008.</font></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Dra.    <i>Mar&iacute;a Virginia G&oacute;mez Padr&oacute;n</i>. Calle 27 No. 82 Apto.    45 entre N y O, El Vedado, Plaza de La Revoluci&oacute;n, Ciudad de La Habana,    Cuba. Corrreo electr&oacute;nico: <a href="mailto:mvirgi@infomed.sld.cu">mvirgi@infomed.sld.cu</a></font></p>      ]]></body><back>
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