<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402006000800015</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fibrinógeno: ¿Factor o indicador de riesgo cardiovascular?]]></article-title>
<article-title xml:lang="en"><![CDATA[Fibrinogen: Cardiovascular risk factor or marker?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canseco-Ávila]]></surname>
<given-names><![CDATA[Luis M]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jerjes-Sánchez]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-López]]></surname>
<given-names><![CDATA[Rocío]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Martínez]]></surname>
<given-names><![CDATA[Augusto]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán-Ramírez]]></surname>
<given-names><![CDATA[Denisse]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Unidad de Investigación Clínica en Medicina S.C.  ]]></institution>
<addr-line><![CDATA[San Pedro Garza García ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<volume>76</volume>
<fpage>158</fpage>
<lpage>172</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402006000800015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402006000800015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402006000800015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La disfunción endotelial y un proceso de inflamación local y sistémica forman parte del proceso de la aterosclerosis coronaria, desde el inicio, progresión, hasta su máxima expresión clínica conocida como síndromes coronarios agudos. Dentro de este proceso, el fibrinógeno (Fg) reactante de fase aguda con activa participación en la función endotelial, trombosis e inflamación ha demostrado ser una variable independiente de riesgo cardiovascular con fenómenos de resistencia a diferentes tratamientos antitrombóticos. Conocemos en forma parcial los mecanismos a través de los cuales el fibrinógeno se encuentra elevado en la enfermedad cardiovascular y en la aterosclerosis, sin embargo, parece que las células involucradas en la aterogénesis producen citocinas que inducen una reacción de fase aguda. Los principales mecanismos a través de los cuales el Fg eleva el riesgo cardiovascular son: formación de trombina, agregación plaquetaria, modula función endotelial, promueve proliferación y migración de las células del músculo liso, interactúa con las uniones de plasmina y es una proteína mayor de fase aguda. Evidencia que emerge de estudios epidemiológicos permite considerar al fibrinógeno como un fuerte, consistente e independiente indicador o factor de riesgo cardiovascular. Por todas estas implicaciones, esta revisión analiza evidencia fisiopatogénica y epidemiológica para identificar direcciones que permitan establecer si el Fg como factor o indicador de riesgo es el vínculo perdido entre la enfermedad cardiovascular y los factores clásicos de riesgo. Conclusión: El análisis de los estudios revisados sugiere fuertemente que el Fg es un importante e independiente indicador de riesgo cardiovascular asociado a factores de riesgo convencionales y polimorfismos genéticos. No obstante, es necesario determinar si el Fg se encuentra involucrado o no en la causalidad de la aterotrombosis y en la génesis de eventos cardiovasculares. Mientras esta interrogante y otras esperan una respuesta el Fg emerge como un promisorio indicador adicional de riesgo cardiovascular.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Endothelial dysfunction and inflammation play a crucial role in all stages of atherosclerosis, from the beginning, during progression, and, finally, in its highest clinical expression: acute coronary syndromes. In this process, fibrinogen, an acute phase reactant with active participation in endothelial function, thrombosis and inflammation has proved to be an independent variable to cardiovascular risk together with its participation in resistance phenomena to different antithrombotic approaches. The reasons by which fibrinogen is elevated in cardiovascular disease and atherosclerosis are, in general, only incompletely understood; but all cells involved in the atherogenetic process are able to produce cytokines, which induce an acute phase reaction that increases fibrinogen levels in plasma. The potential pathophysiological mechanisms by which elevated fibrinogen levels mediate cardiovascular risk are multiple. Fibrinogen forms the substrate for thrombin an represents the final step in the coagulation cascade, it is essential for platelet aggregation, it modulates endothelial function, it promotes smooth muscle cell proliferation and migration, it interacts with the binding of plasmin with its receptor and, finally, it represents a major acute phase protein. Epidemiological studies have established sufficient evidence to consider fibrinogen as a strong, consistent, and independent cardiovascular risk marker or factor. Based on all these implications, the target of this review is an analysis of physiopathogenic and epidemiologic evidence searching for guidelines to establish whether fibrinogen as a risk factor or marker is the lost link between cardiovascular disease and classic risk factors. Conclusion: Analyses of the respective studies suggest that fibrinogen is an important and independent cardiovascular risk factor, clearly associated with conventional risk factors and genetic polymorphisms. Whether or not fibrinogen is causally involved in atherothrombogenesis still remains to be determined and despite of unsolved issues that are waiting conclusive answers, fibrinogen has emerged as an important additional marker of cardiovascular risk.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Factores de riesgo cardiovascular]]></kwd>
<kwd lng="es"><![CDATA[Indicadores de riesgo cardiovascular]]></kwd>
<kwd lng="es"><![CDATA[Fibrinógeno]]></kwd>
<kwd lng="es"><![CDATA[Inflamación]]></kwd>
<kwd lng="es"><![CDATA[Trombosis]]></kwd>
<kwd lng="es"><![CDATA[Aterogénesis]]></kwd>
<kwd lng="en"><![CDATA[Cardiovascular risk factors]]></kwd>
<kwd lng="en"><![CDATA[Cardiovascular risk markers]]></kwd>
<kwd lng="en"><![CDATA[Fibrinogen]]></kwd>
<kwd lng="en"><![CDATA[Inflammation]]></kwd>
<kwd lng="en"><![CDATA[Thrombosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n Cl&iacute;nica</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><i><b>Fibrin&oacute;geno.</b></i></font></p>     <p align="center"><font face="verdana" size="4"><i><b>&iquest;Factor o indicador de riesgo cardiovascular?</b></i></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="3"><b>Fibrinogen.</b></font></p>     <p align="center"><font face="verdana" size="3"><b>Cardiovascular risk factor or marker?</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="2"><b>Luis M Canseco&#150;&Aacute;vila,* Carlos Jerjes&#150;S&aacute;nchez,** Roc&iacute;o Ortiz&#150;L&oacute;pez,* Augusto Rojas&#150;Mart&iacute;nez,* Denisse Guzm&aacute;n&#150;Ram&iacute;rez**</b></font></p>     <p align="center">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>* Dpto. Bioqu&iacute;mica, Facultad de Medicina del Hospital Universitario, UANL.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>** Servicio de Urgencias del Hospital de Enfermedades Cardiovasculares y del T&oacute;rax, IMSS, Monterrey, Nuevo Le&oacute;n, M&eacute;xico.</i></font></p>     <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia</b>:     <br>     <i>Dr. Carlos Jerjes&#150;S&aacute;nchez D&iacute;az.     <br>     Director Unidad de Investigaci&oacute;n Cl&iacute;nica en Medicina S.C.    <br>     Santander 316, Bosques de San &Aacute;ngel, sector Palmillas, San Pedro Garza Garc&iacute;a, NL, M&eacute;xico. 66290.     <br>   Tel: (5281) 83100753. Fax: (5281) 83100753.    <br>   </i></font><font face="verdana" size="2"><b>E&#150;mail:</b> <a href="mailto:jerjes@prodigy.net.mx">jerjes@prodigy.net.mx</a>; <a href="mailto:jerjes@infosel.net.mx">jerjes@infosel.net.mx</a></font></p>     <p align="justify">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">La disfunci&oacute;n endotelial y un proceso de inflamaci&oacute;n local y sist&eacute;mica forman parte del proceso de la aterosclerosis coronaria, desde el inicio, progresi&oacute;n, hasta su m&aacute;xima expresi&oacute;n cl&iacute;nica conocida como s&iacute;ndromes coronarios agudos. Dentro de este proceso, el fibrin&oacute;geno (Fg) reactante de fase aguda con activa participaci&oacute;n en la funci&oacute;n endotelial, trombosis e inflamaci&oacute;n ha demostrado ser una variable independiente de riesgo cardiovascular con fen&oacute;menos de resistencia a diferentes tratamientos antitromb&oacute;ticos. Conocemos en forma parcial los mecanismos a trav&eacute;s de los cuales el fibrin&oacute;geno se encuentra elevado en la enfermedad cardiovascular y en la aterosclerosis, sin embargo, parece que las c&eacute;lulas involucradas en la aterog&eacute;nesis producen citocinas que inducen una reacci&oacute;n de fase aguda. Los principales mecanismos a trav&eacute;s de los cuales el Fg eleva el riesgo cardiovascular son: formaci&oacute;n de trombina, agregaci&oacute;n plaquetaria, modula funci&oacute;n endotelial, promueve proliferaci&oacute;n y migraci&oacute;n de las c&eacute;lulas del m&uacute;sculo liso, interact&uacute;a con las uniones de plasmina y es una prote&iacute;na mayor de fase aguda. Evidencia que emerge de estudios epidemiol&oacute;gicos permite considerar al fibrin&oacute;geno como un fuerte, consistente e independiente indicador o factor de riesgo cardiovascular. Por todas estas implicaciones, esta revisi&oacute;n analiza evidencia fisiopatog&eacute;nica y epidemiol&oacute;gica para identificar direcciones que permitan establecer si el Fg como factor o indicador de riesgo es el v&iacute;nculo perdido entre la enfermedad cardiovascular y los factores cl&aacute;sicos de riesgo.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Conclusi&oacute;n</i><b>: </b>El an&aacute;lisis de los estudios revisados sugiere fuertemente que el Fg es un importante e independiente indicador de riesgo cardiovascular asociado a factores de riesgo convencionales y polimorfismos gen&eacute;ticos. No obstante, es necesario determinar si el Fg se encuentra involucrado o no en la causalidad de la aterotrombosis y en la g&eacute;nesis de eventos cardiovasculares. Mientras esta interrogante y otras esperan una respuesta el Fg emerge como un promisorio indicador adicional de riesgo cardiovascular.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Factores de riesgo cardiovascular. Indicadores de riesgo cardiovascular. Fibrin&oacute;geno. Inflamaci&oacute;n. Trombosis. Aterog&eacute;nesis.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Summary</b></font></p>     <p align="justify"><font face="verdana" size="2">Endothelial dysfunction and inflammation play a crucial role in all stages of atherosclerosis, from the beginning, during progression, and, finally, in its highest clinical expression: acute coronary syndromes. In this process, fibrinogen, an acute phase reactant with active participation in endothelial function, thrombosis and inflammation has proved to be an independent variable to cardiovascular risk together with its participation in resistance phenomena to different antithrombotic approaches. The reasons by which fibrinogen is elevated in cardiovascular disease and atherosclerosis are, in general, only incompletely understood; but all cells involved in the atherogenetic process are able to produce cytokines, which induce an acute phase reaction that increases fibrinogen levels in plasma. The potential pathophysiological mechanisms by which elevated fibrinogen levels mediate cardiovascular risk are multiple. Fibrinogen forms the substrate for thrombin an represents the final step in the coagulation cascade, it is essential for platelet aggregation, it modulates endothelial function, it promotes smooth muscle cell proliferation and migration, it interacts with the binding of plasmin with its receptor and, finally, it represents a major acute phase protein. Epidemiological studies have established sufficient evidence to consider fibrinogen as a strong, consistent, and independent cardiovascular risk marker or factor. Based on all these implications, the target of this review is an analysis of physiopathogenic and epidemiologic evidence searching for guidelines to establish whether fibrinogen as a risk factor or marker is the lost link between cardiovascular disease and classic risk factors.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Conclusion</i>: Analyses of the respective studies suggest that fibrinogen is an important and independent cardiovascular risk factor, clearly associated with conventional risk factors and genetic polymorphisms. Whether or not fibrinogen is causally involved in atherothrombogenesis still remains to be determined and despite of unsolved issues that are waiting conclusive answers, fibrinogen has emerged as an important additional marker of cardiovascular risk.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Cardiovascular risk factors. Cardiovascular risk markers. Fibrinogen. Inflammation. Thrombosis. Atherogenesis.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">La disfunci&oacute;n endotelial y la inflamaci&oacute;n participan en forma determinante en todo el proceso de aterog&eacute;nesis, inicio, progresi&oacute;n y su mayor expresi&oacute;n cl&iacute;nica: s&iacute;ndromes coronarios agudos (SCA).<sup>1</sup><sup>&#150;4</sup> Dentro de este escenario, el fibrin&oacute;geno (Fg) reactante de fase aguda, con activa participaci&oacute;n en la funci&oacute;n endotelial, trombosis e inflamaci&oacute;n ha demostrado ser una variable independiente de riesgo cardiovascular,<sup>3,4</sup> con participaci&oacute;n en fen&oacute;menos de resistencia a heparina<sup>5</sup> y terapia fibrinol&iacute;tica.<sup>6 </sup>Esta revisi&oacute;n tiene como objetivo analizar evidencia fisiopatog&eacute;nica y epidemiol&oacute;gica, para identificar si el Fg como factor o indicador de riesgo es el v&iacute;nculo perdido entre la enfermedad cardiovascular y los factores cl&aacute;sicos de riesgo.<sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Estructura y fisiolog&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2">El Fg es una glucoprote&iacute;na con peso molecular de 340 kDa.<sup>8</sup> con una estructura de tres cadenas polipept&iacute;dicas (alfa, beta y gamma)<sup>9</sup> que se sintetiza principalmente en el h&iacute;gado<sup>10</sup> y cuya principal funci&oacute;n en la coagulaci&oacute;n es transformarse por acci&oacute;n de la trombina en fibrina insoluble. Tiene una vida media de 100 horas (3 a 6 d&iacute;as) y los niveles plasm&aacute;ticos de 150 a 450 mg/dL superan las concentraciones m&iacute;nimas (50 a 100 mg/dL) requeridas para la hemostasis.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">Es una prote&iacute;na de fase aguda conocida como factor I que como expresi&oacute;n de una respuesta inflamatoria puede incrementar 2 a 20 veces su valor normal. Durante esta respuesta se observan cifras anormales de Fg de 3 a 5 d&iacute;as, hasta que la inflamaci&oacute;n remite y gradualmente retorna a su nivel basal.<sup>3,4,11</sup> Tiene un catabolismo mediado por plasmina que al actuar sobre el Fg y la fibrina genera productos de degradaci&oacute;n D y E que estimulan producci&oacute;n de macr&oacute;fagos, interleucina &#150; 6 y otros factores que activan he&#150;patocitos e incrementan su s&iacute;ntesis.<sup>12</sup> Estos mecanismos son importantes para la regulaci&oacute;n y modificaciones que se observan en la reacci&oacute;n de fase aguda.<sup>13</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Patofisiolog&iacute;a en la enfermedad cardiovascular</b></font></p>     <p align="justify"><font face="verdana" size="2">El Fg tiene una actividad importante en el proceso de inflamaci&oacute;n, aterosclerosis y trombog&eacute;nesis y aunque el conocimiento es incompleto, mecanismos como el aumento de la viscosidad sangu&iacute;nea, agregaci&oacute;n plaquetaria y trombosis pueden incrementar el riesgo cardiovascular. El Fg tambi&eacute;n modula la disfunci&oacute;n endotelial y promueve migraci&oacute;n y proliferaci&oacute;n de las c&eacute;lulas del m&uacute;sculo liso <i><a href="/img/revistas/acm/v76s4/a15f1.jpg" target="_blank">(Fig. I)</a>.<sup>3</sup></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Inflamaci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Experimentalmente se ha demostrado acumulo de fibrina en tejidos con inflamaci&oacute;n y existe una relaci&oacute;n directa entre inflamaci&oacute;n y reducci&oacute;n del Pg <sup>3,4,14</sup> iniciaimente este proceso es mediado por una interacci&oacute;n con leucocitos a trav&eacute;s de sus receptores de superficie (mol&eacute;culas de adhesi&oacute;n celular (MAC) &#150;1 y alfa X beta 2). Estos monocitos y neutr&oacute;filos en su uni&oacute;n con el Fg pueden inducir espec&iacute;ficamente a los receptores de las MAC &#150;I.<sup>3,4,15,16</sup> Esta habilidad de acoplamiento resulta de la maduraci&oacute;n que ocurre en el receptor durante el proceso de diferenciaci&oacute;n celular que facilita la respuesta quimiot&aacute;ctica, con la particularidad de que el sitio de interacci&oacute;n del receptor con el Fg no es compartido por ninguna otra integrina.<sup>17,18</sup> Los mecanismos que inducen los cambios proinflamatorios en los leucocitos son el aumento de calcio intracelular y un incremento en la expresi&oacute;n de marcadores de activaci&oacute;n de neutr&oacute;filos. Este proceso incrementa la fagocitosis, toxicidad mediada por anticuerpos y retraso en la apoptosis.<sup>19</sup></font></p>     <p align="justify"><font face="verdana" size="2">El Fg se une a la mol&eacute;cula de adhesi&oacute;n intercelular &#150;1 (ICAM&#150;1) y potencia la interacci&oacute;n entre monocitos y c&eacute;lulas endoteliales,<sup>3,4,20,21</sup> regula e incrementa las concentraciones de ICAM &#150;1 sobre la superficie de las c&eacute;lulas endoteliales, fortalece la adhesi&oacute;n de leucocitos,<sup>22</sup> contribuye a la agregaci&oacute;n plaquetaria y su interacci&oacute;n con ICAM &#150; 1 se asocia con proliferaci&oacute;n celular.<sup>23</sup> Toda esta evidencia establece su importancia como mediador c&eacute;lula &#150; c&eacute;lula y su participaci&oacute;n en el proceso de adhesi&oacute;n e inflamaci&oacute;n.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Aterog&eacute;nesis</b></font></p>     <p align="justify"><font face="verdana" size="2">En este proceso la fibrina participa y contribuye al crecimiento de la placa y <sup>3,4,24,25</sup> el Fg y sus metabolites inducen disfunci&oacute;n endotelial por mecanismos como: 1) liberaci&oacute;n de mediadores vasoactivos por su uni&oacute;n a las c&eacute;lulas endoteliales,<sup>26</sup> 2) modulaci&oacute;n de la permeabilidad y migraci&oacute;n de estas c&eacute;lulas reforzando su dep&oacute;sito en el espacio subendotelial, 3) promoci&oacute;n para la proliferaci&oacute;n y quimiotaxis del m&uacute;sculo liso y 4) proporci&oacute;n de superficie de absorci&oacute;n para acumulaci&oacute;n extracelular de lipoprote&iacute;nas de baja densidad, que facilita su transferencia a los macr&oacute;fagos, mecanismo fundamental en la formaci&oacute;n de c&eacute;lulas espumosas.<sup>3,4,27</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Trombosis</b></font></p>     <p align="justify"><font face="verdana" size="2">El da&ntilde;o endotelial mediado por ruptura o erosi&oacute;n, expone al factor tisular, el cual activa la v&iacute;a extr&iacute;nseca de la cascada de coagulaci&oacute;n a trav&eacute;s del factor VIL El contacto de la sangre con la lesi&oacute;n endotelial inicia la v&iacute;a intr&iacute;nseca por activaci&oacute;n del factor XII y la agregaci&oacute;n plaquetaria. Considerando en el inicio la inestabilidad de un trombo dominantemente plaquetario, la activaci&oacute;n de la cascada es un proceso imprescindible <i><a href="#f2">(Fig. 2)</a>.</i><sup>4</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a15f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">La contribuci&oacute;n del Fg en la enfermedad arterial coronaria (EAC) se explica por su actividad en la parte final de la cascada de coagulaci&oacute;n y su participaci&oacute;n en la agregaci&oacute;n plaquetaria y en la formaci&oacute;n de un trombo rico en plaquetas y/o fibrina. <b>Agregaci&oacute;n plaquetaria y trombosis: </b>el Fg se une al receptor de superficie plaquetaria Ilb/IIIa y origina la formaci&oacute;n de un trombo mediante la activaci&oacute;n y agregaci&oacute;n plaquetaria.<sup>28 </sup><b>Formaci&oacute;n del trombo de fibrina: </b>Es el precursor de trombosis mural y a trav&eacute;s de una red de fibrina firme y r&iacute;gida participa directamente en el tama&ntilde;o, estructura y remodelaci&oacute;n del trombo.<sup>29</sup> Tambi&eacute;n interfiere en la uni&oacute;n del plasmin&oacute;geno con su receptor, lo que modifica desfavorablemente la fibrin&oacute;lisis end&oacute;gena e induce una menor remodelaci&oacute;n del trombo.<sup>3,30</sup> <b>Viscosidad de la sangre: </b>el Fg es el mayor determinante de la agregaci&oacute;n eritrocitaria y de la viscosidad de la sangre, su incremento interfiere con la microcirculaci&oacute;n y por la velocidad de fricci&oacute;n produce da&ntilde;o endotelial y trombosis.<sup>31,32</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Factores que modifican el fibrin&oacute;geno</b></font></p>     <p align="justify"><font face="verdana" size="2">Adem&aacute;s de la relaci&oacute;n que se ha demostrado entre los niveles de Fg y riesgo cardiovascular,<sup>33,34 </sup>algunos factores end&oacute;genos o ex&oacute;genos pueden modificar su nivel <a href="#t1">(Tabla I)</a>.<sup>4</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="t1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s4/a15t1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Factores end&oacute;genos</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Gen&eacute;ticos</b></font></p>     <p align="justify"><font face="verdana" size="2">Las variaciones plasm&aacute;ticas del Fg parecen estar reguladas por polimorfismos (20% a 51%)<sup>35,36</sup> y se encuentra formado por tres cadenas estructurales: gamma, alfa y beta codificadas por tres genes en el cromosoma 4 en el locus 4q23&#150;q32<sup>37 </sup>y <i><a href="/img/revistas/acm/v76s4/a15f3.jpg" target="_blank">(Fig. 3)</a> </i>su s&iacute;ntesis se regula por el polimorfismo de cadena &beta;.<sup>38</sup></font></p>     <p align="justify"><font face="verdana" size="2">Aunque varios polimorfismos en el promotor &#150;455 G/A, &#150;148 C/T, Bcll, TaqI, &#150;854 G/A, R448K tienen relaci&oacute;n estrecha con el incremento plasm&aacute;tico del Fg y la EAC,<sup>35,39&#150;41</sup> espec&iacute;ficamente el polimorfismo &#150;455 G/A se asocia con mayores niveles de FG y con un mayor riesgo de trombosis (40%).<sup>39</sup> Los valores m&aacute;s elevados de Fg se observan en pacientes con el gen homocigoto &#150;455AA (390 mg/dL) en relaci&oacute;n con el heterocigoto &#150;455GA (320 mg/dL) y homocigoto &#150;455GG. (310 mg/dL) (p &lt; 0.05) En individuos con el alelo &#150;455A podr&iacute;a existir un estado de hipercoagulabilidad y una fuerte respuesta de fase aguda como expresi&oacute;n fisiopatog&eacute;nica para progresi&oacute;n de la aterosclerosis coronaria.<sup>42&#150;44</sup></font></p>     <p align="justify"><font face="verdana" size="2">El polimorfismo Bcll incrementa dos veces el riesgo de infarto (OR 2.4; 95% CI 1.3&#150;4.6) y de eventos adversos cardiovasculares.<sup>3,43,44</sup> En presencia del genotipo B1B1 se han observado niveles de Fg de 274 mg/dL, en heterocigotos de 298 mg/dL y con el genotipo B2B2 de 369 mg/ dL.<sup>35,45</sup> Sin embargo, ning&uacute;n estudio ha demostrado una relaci&oacute;n entre polimorfismos, (Taql, Bel I, &#150;455G/A y Sacl) niveles de Fg y EAC.<sup>46</sup> Por otra parte, considerando la interacci&oacute;n entre gen medio ambiente, los polimorfismos codificados por la cadena b&beta; del Fg parecen influir en la respuesta individual al tabaquismo.<sup>47</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Factores ex&oacute;genos</b></font></p>     <p align="justify"><font face="verdana" size="2">En la <i><a href="#t1">Tabla I </a></i>se resumen todos los factores que pueden modificar los niveles de Fg.<sup>48</sup> El estudio PRIME realizado en 10,500 individuos sanos (50&#150;59 a&ntilde;os) demostr&oacute; una relaci&oacute;n estrecha entre niveles elevados de Fg con edad, &iacute;ndice de masa corporal, cintura, tabaquismo, diabetes, LDL, HDL, menor consumo de alcohol, nivel de educaci&oacute;n y ejercicio.<sup>49</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Sexo </b>y <b>edad</b></font></p>     <p align="justify"><font face="verdana" size="2">Aunque algunos datos sugieren que independientemente de la edad, embarazo y uso de anticonceptivos orales, el Fg se encuentra m&aacute;s elevado en el sexo femenino que en el masculino,<sup>50&#150;54 </sup>sin embargo, estos resultados son controversiales.<sup>52</sup> El incremento del Fg en relaci&oacute;n con la edad pudiera atribuirse m&aacute;s a una deficiencia org&aacute;nica para disponer del Fg circulante que a un aumento en su s&iacute;ntesis.<sup>50,52,55&#150;57</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>&Iacute;ndice de masa corporal</b></font></p>     <p align="justify"><font face="verdana" size="2">En ambos sexos existe una correlaci&oacute;n directamente proporcional con los niveles de Fg y el &iacute;ndice de masa corporal,<sup>50,56,58</sup> observ&aacute;ndose los niveles m&aacute;s elevados con &iacute;ndices &gt; 30 kg/m<sup>2,</sup><sup>59 </sup>La disminuci&oacute;n del Fg mediante reducci&oacute;n del peso corporal sugiere que la obesidad asociada a hiperfibrinogenemia podr&iacute;a tener un impacto similar al de los factores de riesgo tradicionales y que el control del peso y por consiguiente del Fg, podr&iacute;a reducir mortalidad por enfermedades cardiovasculares y tromboemb&oacute;licas.<sup>58,60</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>S&iacute;ndrome metab&oacute;lico</b></font></p>     <p align="justify"><font face="verdana" size="2">Su definici&oacute;n cl&aacute;sica incluye por lo menos tres de los siguientes indicadores: &iacute;ndice de masa corporal &gt; 30 kg/m<sup>2</sup>, lipoprote&iacute;nas de alta densidad &lt; 1.13 mmol/L, triglic&eacute;ridos &gt; 1.80 mmol/ L, glucosa &gt; 5.5 mmol/L y tensi&oacute;n arterial diast&oacute;lica &gt; 90 mm Hg.<sup>61</sup> En este s&iacute;ndrome se han demostrado mayores niveles de Fg (300.2 &plusmn;3.0 mg/dL) en relaci&oacute;n con controles, (285.1 &plusmn;1.9 p = 0.01) por lo que considerando la fisiopatogenia de la EAC, la hiperfibrinogenemia u otro indicador de inflamaci&oacute;n podr&iacute;an ser el componente olvidado de este s&iacute;ndrome.<sup>62</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Ejercicio f&iacute;sico</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Ocasional</b></font></p>     <p align="justify"><font face="verdana" size="2">En hombres j&oacute;venes (26.6 &plusmn;3.6 a&ntilde;os) sometidos a esfuerzo m&aacute;ximo y subm&aacute;ximo se han demostrado cambios en el volumen plasm&aacute;tico del Fg de 266.3 &plusmn; 14.5 a 222.2 &plusmn; 23.9 mg/dL y de 239.5 &plusmn; 45.4 a 209.7 &plusmn; 42.4 mg/dL respectivamente.<sup>63 </sup>Aunque otros estudios no han podido reproducir estos resultados, existe evidencia que el ejercicio mejora la fibrin&oacute;lisis al incrementar el activador tisular del plasmin&oacute;geno y disminuir su inhibidor.<sup>64</sup> Sin embargo, esta diferencia podr&iacute;a atribuirse a la heterogeneidad observada en las poblaciones, protocolos de ejercicio, procesamiento de pruebas y m&eacute;todos para determinar el Fg.<sup>65,66</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Regular</b></font></p>     <p align="justify"><font face="verdana" size="2">Este tipo de ejercicio en comparaci&oacute;n con el de fin de semana reduce significativamente morbilidad y mortalidad cardiovascular, riesgo de cardiopat&iacute;a isqu&eacute;mica (15%) y niveles de Fg.<sup>67&#150;69</sup> Un programa constante podr&iacute;a disminuir el riesgo de EAC a trav&eacute;s de una disminuci&oacute;n del Fg.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Per&iacute;odos estacionales</b></font></p>     <p align="justify"><font face="verdana" size="2">En la &eacute;poca invernal la mayor incidencia de infarto con elevaci&oacute;n del ST se ha atribuido a vasoconstricci&oacute;n coronaria y posibles infecciones,<sup>70&#150;72</sup> sin embargo deben ser considerados otros mecanismos de trombosis como factores hemost&aacute;ticos, disfunci&oacute;n endotelial e inflamaci&oacute;n. En esta &eacute;poca se ha demostrado en pacientes &gt; 75 a&ntilde;os<sup>73</sup> niveles de Fg &gt; 350 mg/dL en comparaci&oacute;n con el verano (&lt; 295 mg/dL, p &lt; 0.00001).<sup>72</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Factores socioecon&oacute;micos</b></font></p>     <p align="justify"><font face="verdana" size="2">Aunque no existe un claro mecanismo, evidencias recientes sugieren que la relaci&oacute;n inversa entre el estado socioecon&oacute;mico y la EAC podr&iacute;a explicarse en parte por diferentes niveles de Fg.<sup>74 </sup>Al analizar en adultos de ambos sexos el medio socioecon&oacute;mico en la infancia (altura de adulto, clase social del padre y educaci&oacute;n) se demostr&oacute; una relaci&oacute;n inversa con los niveles de Fg. En el grupo con el estado socioecon&oacute;mico bajo (calidad del empleo) se observaron los niveles m&aacute;s elevados de Fg con una diferencia de 220 mg/ dL (95% CI 0.13&#150;0.31) para el g&eacute;nero masculino y 370 mg/dL (CI 0.18&#150;0.56) para el femenino (p &lt; 0.0001).<sup>75</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Estado hormonal</b></font></p>     <p align="justify"><font face="verdana" size="2">Los anticonceptivos orales a trav&eacute;s del aumento de estr&oacute;genos incrementa significativamente los niveles de Fg<sup>56,76</sup> y cuando &eacute;stos se suspenden las cifras de Fg se normalizan en los siguientes tres meses.<sup>77</sup> La menopausia tiene un efecto independiente sobre los niveles de esta prote&iacute;na<sup>78</sup> y durante el climaterio la hiperfibrinogenemia aumenta el riesgo de EAC (40%) en comparaci&oacute;n con premenop&aacute;usicas de la misma edad.<sup>79</sup> Aunque el tratamiento substitutivo parece conferir un efecto protector al disminuir viscosidad plasm&aacute;tica y Fg,<sup>80,81</sup> otros datos sugieren que el Fg se incrementa o no se modifica.<sup>82,83</sup> La inconsistencia demostrada entre Fg, EAC y terapia hormonal sustitutiva podr&iacute;a atribuirse a la heterogeneidad de la poblaci&oacute;n y tratamiento utilizado, por lo que muchas interrogantes se encuentran en espera de evidencias que emanen de estudios bien dise&ntilde;ados.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Tabaquismo</b></font></p>     <p align="justify"><font face="verdana" size="2">La forma activa o pasiva se asocia estrechamente con hiperfibrinogenemia, por lo que &eacute;ste podr&iacute;a ser otro mecanismo importante en la g&eacute;nesis multifactorial de eventos cardiovasculares adversos asociados a este h&aacute;bito.<sup>84,85 </sup>Por cada cigarro diario el Fg incrementa 35 mg/dL<sup>52</sup>y en 10 a&ntilde;os, independientemente del sexo, el riesgo cardiovascular crece exponencialmente con los niveles de Fg. (180 a 450 mg/dL).<sup>86</sup> En fumadores pasivos del sexo femenino se han demostrado rangos de Fg m&aacute;s altos (86 a 120 mg/dL) en relaci&oacute;n a controles. Estos valores corresponden aproximadamente a un 40% o 60% de lo observado en fumadores activos.<sup>87</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los niveles de Fg m&aacute;s elevados se observan en pacientes con infarto y tabaquismo activo (24 horas previas) en relaci&oacute;n con grupos que no fumaron.<sup>88</sup> Un efecto similar se ha observado en fumadores cr&oacute;nicos (22.7 &plusmn;1.3 mg/kg), en comparaci&oacute;n con no fumadores. (16.0 &plusmn; 1.3 mg/kg, p &lt; 0.01). Posterior a la suspensi&oacute;n del h&aacute;bito (dos semanas) se ha observado una disminuci&oacute;n importante del Fg en relaci&oacute;n con los valores iniciales.<sup>89</sup> El mecanismo por el cual el tabaquismo incrementa los niveles de Fg se atribuye a una reacci&oacute;n inflamatoria en bronquios, alv&eacute;olos y vasos pulmonares<sup>90</sup> con liberaci&oacute;n de citocinas (interleucinas &#150; 6) que activan su producci&oacute;n hep&aacute;tica.<sup>91&#150;93</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Infecciones</b></font></p>     <p align="justify"><font face="verdana" size="2">Se ha observado una relaci&oacute;n directa con infecciones, <i>(Helicobacter pylori y Clamidia pneumoniae)<sup>94,</sup><sup>95</sup> </i>niveles elevados de Fg y mayor riesgo de EAC. Tambi&eacute;n se han demostrado en pacientes con infarto cerebral, hipertensi&oacute;n y EAC anticuerpos contra <i>C. pneumoniae.<sup>95</sup><sup>&#150;97</sup> </i>Aunque no es claro el mecanismo por el cual estos microorganismos modifican el riesgo cardiovascular, infecciones agudas o cr&oacute;nicas podr&iacute;an aumentar las prote&iacute;nas de fase aguda, incluyendo al Fg.<sup>98,99</sup> Han fallado estudios que intentan establecer una relaci&oacute;n entre infecci&oacute;n, EAC y Fg, por lo que esta hip&oacute;tesis se encuentra en espera de mayor evidencia.<sup>97,100&#150;</sup><sup>103</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Evidencia epidemiol&oacute;gica entre enfermedad arterial coronaria y fibrin&oacute;geno</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Estudios longitudinales</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Northwick Park Heart</b></font></p>     <p align="justify"><font face="verdana" size="2">Datos obtenidos en los &uacute;ltimos a&ntilde;os establecen al Fg como variable independiente de riesgo para EAC.<sup>4</sup> La primera evidencia emana de este estudio<sup>104</sup> que incluy&oacute; 1,511 masculinos de raza blanca con un seguimiento de 7 a 13 a&ntilde;os. El Fg fue factor de riesgo mayor para EAC y tuvo, independientemente de la edad, mayor valor predictivo para infarto que el colesterol.<sup>105</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Gothenburg</b></font></p>     <p align="justify"><font face="verdana" size="2">Este estudio se realiz&oacute; a mediados de los a&ntilde;os ochenta y analiz&oacute; variables como Fg, tensi&oacute;n arterial, colesterol y tabaquismo en un seguimiento de 13.5 a&ntilde;os. El Fg fue la variable independiente de riesgo m&aacute;s importante para infarto a corto<sup>106</sup> y mediano plazo (7.3 a&ntilde;os).<sup>107</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>PROCAM</b></font></p>     <p align="justify"><font face="verdana" size="2">Durante dos a&ntilde;os examin&oacute; individuos del sexo masculino sin historia de EAC. Los pacientes con enfermedad cardiovascular tuvieron niveles de Fg en el tercil superior.<sup>108</sup> Dos importantes estudios subsecuentes, Caerphilly y Speedwell, confirmaron estos resultados y establecieron al Fg como factor de riesgo independiente.<sup>109</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Framingham</b></font></p>     <p align="justify"><font face="verdana" size="2">En individuos de ambos sexos estableci&oacute; en un seguimiento de 14 a&ntilde;os que el riesgo de EAC incrementa directamente con las concentraciones de Fg.<sup>110</sup> Sin embargo, por la &eacute;poca en la que el estudio se realiz&oacute; no se obtuvieron en forma sistem&aacute;tica determinaciones de LDL o si esto se hizo no se utilizaron m&eacute;todos apropiados.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>GRIPS</b></font></p>     <p align="justify"><font face="verdana" size="2">Este estudio cuantific&oacute; variables como LDL, HDL, Fg, edad, tabaquismo, diabetes, tensi&oacute;n arterial y lipoprote&iacute;nas. Modelos de regresi&oacute;n univariado y m&uacute;ltiple establecieron al Fg como fuerte predictor de EAC.<sup>111</sup> Estudios prospectivos sugieren que un Fg en el cuartil superior (&gt; 560 mg/dL) incrementa el riesgo de infarto o enfermedad vascular cerebral aguda de 1.8 a 4.1 veces en relaci&oacute;n al cuartil inferior<sup>34</sup> (&lt; 350 mg/dL).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Estudios transversales </b><b>MONICA y Scottish Heart Health</b></font></p>     <p align="justify"><font face="verdana" size="2">El primero demostr&oacute; en fumadores de ambos sexos un incremento significativo del Fg <sup>112</sup> y en el segundo se observaron las cifras m&aacute;s altas de Fg en fumadores, sexo femenino, &gt; 65 a&ntilde;os, obesos e hipercolesterol&eacute;micos. El consumo de alcohol tuvo una relaci&oacute;n inversa con los niveles de esta prote&iacute;na.<sup>113</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>ARIC</b></font></p>     <p align="justify"><font face="verdana" size="2">Hasta nuestro conocimiento es el estudio transversal m&aacute;s importante que ha tratado de correlacionar factores hemost&aacute;ticos con EAC. Resultados controlados sugieren que las cifras m&aacute;s elevadas de Fg se observan en individuos de raza negra y sexo femenino.<sup>114</sup></font></p>     <p align="justify"><font face="verdana" size="2">A trav&eacute;s de estudios epidemiol&oacute;gicos en masculinos de 40 a 65 a&ntilde;os se ha demostrado el impacto del valor predictivo del Fg para eventos coronarios.<sup>115</sup> En Escoceses, cifras elevadas fueron un factor de riesgo para EAC<sup>116</sup> y en poblaci&oacute;n japonesa&#150;americana se asoci&oacute; con mayor mortalidad.<sup>117</sup> Estos resultados se han reproducido en poblaci&oacute;n norteamericana<sup>118 </sup>y en espa&ntilde;oles con SCA sin necrosis mioc&aacute;rdica.<sup>119</sup></font></p>     <p align="justify"><font face="verdana" size="2">En la <i><a href="/img/revistas/acm/v76s4/a15t2.jpg" target="_blank">Tabla II</a> </i>se resumen los resultados de los estudios m&aacute;s importantes que han tratado de identificar el significado del Fg en el escenario de la EAC. No obstante la heterogeneidad en los grupos de estudio, variabilidad en el seguimiento, diferentes objetivos y m&eacute;todos de an&aacute;lisis,<sup>3</sup> la evidencia actual sugiere al Fg como un importante factor de riesgo independiente. Sin embargo, al derivar todo este conocimiento de estudios europeos y norteamericanos, surge la necesidad en nuestro medio de identificar su asociaci&oacute;n con EAC e intentar establecer si es un factor o indicador de riesgo cardiovascular.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Eventos adversos</b></font></p>     <p align="justify"><font face="verdana" size="2">En SCA sin elevaci&oacute;n del ST y sin necrosis mioc&aacute;rdica cifras elevadas de Fg se relacionan con mayor incidencia de isquemia refractaria, mortalidad y arritmias ventriculares. Para mortalidad cardiovascular el tercil superior (375 mg/ dL) ha demostrado una sensibilidad y especificidad del 70%.<sup>120</sup> Al analizar el valor predictivo del Fg y de la prote&iacute;na C reactiva en este grupo no se observ&oacute; ninguna diferencia estad&iacute;sticamente significativa. Este estudio demostr&oacute; en los grupos que se distribuyeron en el tercil inferior, medio o superior (338 mg/dL a 400 mg/dL) mayor incidencia de eventos cardiovasculares adversos e infarto con una tasa de mortalidad progresiva<sup>121</sup> (5.4%, 12% y 19%).</font></p>     <p align="justify"><font face="verdana" size="2">Un Fg &gt; 383 mg/dL en poblaciones sin EAC ha demostrado mayor incidencia de eventos cardiovasculares, hipertrofia ventricular, enfermedad arterial y disfunci&oacute;n ventricular, lo que confirma al Fg como un factor independiente para eventos cardiovasculares por da&ntilde;o a &oacute;rgano blanco.<sup>122</sup> El estudio EC AT incluy&oacute; individuos con EAC y demostr&oacute; que un Fg anormal, aun en el l&iacute;mite superior, fue un importante indicador de riesgo cardiovascular.<sup>123</sup> Evidencias recientes sugieren que el Fg es un factor predictivo importante para mortalidad cardiovascular o de cualquier otro origen, superando a la hipertensi&oacute;n arterial e hipercolesterolemia.<sup>124</sup></font></p>     <p align="justify"><font face="verdana" size="2">En poblaci&oacute;n japonesa&#150;americana con bajo riesgo para EAC los niveles elevados de Fg demostraron ser indicadores de riesgo y predictores de mortalidad global. Esto se atribuy&oacute; en parte a su participaci&oacute;n en el proceso sostenido de inflamaci&oacute;n y disfunci&oacute;n endotelial.<sup>117</sup> Aunque la asociaci&oacute;n de cifras elevadas de Fg y homociste&iacute;na triplica el riesgo de mortalidad, no se ha demostrado una interacci&oacute;n significativa.<sup>125</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Terap&eacute;uticas que podr&iacute;an modificar las cifras de fibrin&oacute;geno</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Fibratos</b></font></p>     <p align="justify"><font face="verdana" size="2">Derivados del &aacute;cido f&iacute;brico en roedores reduce los niveles de Fg, lo que sugiere que podr&iacute;a estar regulado por el receptor alfa activado por un proliferador de peroxisomas.<sup>126</sup> El fenofibrato en pacientes con hiperlipidemia disminuye las concentraciones de IL&#150;6, PCR y Fg posiblemente a trav&eacute;s de la activaci&oacute;n de este receptor.<sup>127</sup> Sin embargo, en otros estudios a pesar de que el colesterol y los triglic&eacute;ridos disminuyeron con clofibrato y dieta, el nivel del Fg no se modific&oacute;.<sup>128</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Estatinas</b></font></p>     <p align="justify"><font face="verdana" size="2">Su efecto sobre el Fg no se conoce y la evidencia es escasa. Un estudio aleatorizado que estudi&oacute; cinco estatinas no demostr&oacute; cambios significativos a tres meses de seguimiento.<sup>129</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Hipoglucemiantes</b></font></p>     <p align="justify"><font face="verdana" size="2">En pacientes con EAC sin diabetes mellitus la rosiglitazona reduce significativamente la activaci&oacute;n endotelial celular y los reactantes de fase aguda, incluyendo Fg.<sup>130</sup> Aunque este medicamento podr&iacute;a estabilizar la placa, atenuar la disfunci&oacute;n endotelial y reducir el Fg, se requiere mayor evidencia.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Terapia hormonal</b></font></p>     <p align="justify"><font face="verdana" size="2">Como se discuti&oacute; previamente, los anticonceptivos orales con concentraciones altas de estr&oacute;genos incrementan los niveles de Fg<sup>56,76</sup> y al suspenderlos sus valores se normalizan.<sup>77</sup> La terapia hormonal de reemplazo (estr&oacute;genos con progestagenos o estr&oacute;genos solos) reduce las cifras de Fg y la viscosidad plasm&aacute;tica, lo que podr&iacute;a ofrecer un efecto protector para EAC.<sup>78,80</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acido acetilsalic&iacute;lico</b></font></p>     <p align="justify"><font face="verdana" size="2">Los reportes cl&iacute;nicos que estudian el impacto a corto y largo plazo no han demostrado cambios significativos en la concentraci&oacute;n plasm&aacute;tica, pero estos estudios carecen de poder estad&iacute;stico para establecer si existe o no alg&uacute;n efecto ben&eacute;fico.<sup>115</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Oxido n&iacute;trico</b></font></p>     <p align="justify"><font face="verdana" size="2">Sobre el Fg parece inhibir la adhesi&oacute;n y agregaci&oacute;n plaquetaria estableciendo un efecto antitromb&oacute;tico al impedir la uni&oacute;n del Fg con la membrana plaquetaria. Aunque algunos vasodilatadores coronarios estimulan en forma indirecta la producci&oacute;n de &oacute;xido n&iacute;trico no hay evidencia que demuestre su utilidad.<sup>131&#150;133</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Heparinas</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En SCA con y sin elevaci&oacute;n del ST dosis bajas de heparina durante seis meses disminuyeron significativamente los valores del Fg en relaci&oacute;n al control.<sup>134</sup> En presencia de niveles elevados de Fg y de otros reactantes de fase aguda se ha demostrado mayor resistencia a heparinas no fraccionadas y de bajo peso molecular. Esto se ha atribuido a una mayor adhesi&oacute;n no espec&iacute;fica de las heparinas a glucoprote&iacute;nas ricas en histidina, vitronectina, fibronectina, lipoprote&iacute;nas, factor plaquetario 4 y prote&iacute;nas plasm&aacute;ticas. Estas interacciones no espec&iacute;ficas limitan la cantidad de heparina disponible en su uni&oacute;n con la antitrombina, lo que disminuye considerablemente su efecto anticoagulante.<sup>135,136</sup> Toda esta evidencia sugiere que en presencia de niveles elevados de Fg, la dosis est&aacute;ndar de heparina no&#150;fraccionada o de bajo peso molecular posiblemente requieren un nuevo an&aacute;lisis.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Terapia fibrinol&iacute;tica</b></font></p>     <p align="justify"><font face="verdana" size="2">En SCA con elevaci&oacute;n del ST la ausencia de un estado l&iacute;tico (Fg &lt; 100 mg/dL) 90 minutos despu&eacute;s de administrar anistreplasa tuvo un alto valor predictivo para fracaso terap&eacute;utico.<sup>137</sup> Por la participaci&oacute;n del Fg en la funci&oacute;n endotelial, trombosis e inflamaci&oacute;n, un estado de hiperfibrinogenemia podr&iacute;a ser un mecanismo m&aacute;s y/o un indicador de riesgo para un fen&oacute;meno de trombo&#150;resistencia, sin embargo en este &aacute;mbito la evidencia es reducida. En pacientes con infarto agudo y comportamiento cl&iacute;nico similar, la presencia de leucocitos &gt; 10,000 (indicador de inflamaci&oacute;n) tuvo relaci&oacute;n directa con fracaso de la terapia fibrinol&iacute;tica por perfusi&oacute;n epic&aacute;rdica y mioc&aacute;rdica sub&oacute;ptima y mala evoluci&oacute;n.<sup>146</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Consideraciones</b></font></p>     <p align="justify"><font face="verdana" size="2">1.&nbsp; Las variaciones plasm&aacute;ticas del Fg est&aacute;n reguladas por polimorfismos gen&eacute;ticos y factores ex&oacute;genos.</font></p>     <p align="justify"><font face="verdana" size="2">2.&nbsp; Los niveles elevados de FG se asocian con eventos cardiovasculares adversos y tienen un valor predictivo para mortalidad igual o mayor a la hipertensi&oacute;n arterial e hipercolesterolemia.</font></p>     <p align="justify"><font face="verdana" size="2">3.&nbsp; Evidencia obtenida de meta&#150;an&aacute;lisis sugieren que la prote&iacute;na C &#150; reactiva, leucocitos (&gt; 10,000) y Fg (&gt; 350 mg/dL) son factores de riesgo cardiovascular establecidos.<sup>147</sup></font></p>     <p align="justify"><font face="verdana" size="2">4.&nbsp; Aunque no existe un nivel de corte est&aacute;ndar internacional, la determinaci&oacute;n de Fg podr&iacute;a recomendarse en individuos con riesgo alto para EAC, considerando que cifras &gt; 300 mg/ dL tienen un alto valor predictivo de riesgo.<sup>3 </sup>Este grupo podr&iacute;a beneficiarse con una prevenci&oacute;n primaria o secundaria m&aacute;s intensa.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">5.&nbsp; Por su relaci&oacute;n con inflamaci&oacute;n, trombosis, trombo&#150;resistencia, retrombosis y eventos cardiovasculares adversos el Fg podr&iacute;a ser importante para estratificar riesgo en SCA.</font></p>     <p align="justify"><font face="verdana" size="2">6.&nbsp; El Fg podr&iacute;a ser el elemento olvidado en la definici&oacute;n del s&iacute;ndrome metab&oacute;lico, por lo que &eacute;ste u otro marcador de inflamaci&oacute;n deber&aacute;n ser considerados.</font></p>     <p align="justify"><font face="verdana" size="2">7.&nbsp; La evidencia limitada en Latinoam&eacute;rica sugiere la necesidad de realizar estudios para identificar el papel del Fg como un factor o indicador de riesgo cardiovascular, as&iacute; como determinar en poblaciones bien definidas el valor normal, riesgo cardiovascular y si alguna acci&oacute;n terap&eacute;utica modifica los valores plasm&aacute;ticos. En nuestro medio se encuentra subevaluado.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusi&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">El an&aacute;lisis de los estudios revisados sugiere fuertemente que el Fg es un importante e independiente indicador de riesgo cardiovascular asociado a factores de riesgo convencionales y polimorfismos gen&eacute;ticos. No obstante, es necesario determinar si el Fg se encuentra involucrado o no en la causalidad de la aterotrombosis y en la g&eacute;nesis de eventos cardiovasculares. Mientras esta interrogante y otras esperan una respuesta el Fg emerge como un promisorio indicador adicional de riesgo cardiovascular.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1.&nbsp;Libby P: <i>Current concepts of the pathogenesis of the acute coronary syndromes. </i>Circulation 2001; 104: 365&#150;372.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055682&pid=S1405-9940200600080001500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2.&nbsp;Ross R: <i>Atherosclerosis&#150;an inflammatory disease. </i>N Engl J Med 1999; 340: 115&#150;126.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055683&pid=S1405-9940200600080001500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">3.&nbsp;Koenig W: <i>Fibrin (ogen) in cardiovascular disease: an update. </i>Thromb Haemost 2003; 89: 601&#150;609.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055684&pid=S1405-9940200600080001500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">4.&nbsp; Kamath S, Lip GY: <i>Fibrinogen: biochemistry, epidemiology and determinants. </i>QJM 2003; 96:711&#150;729.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055685&pid=S1405-9940200600080001500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">5.&nbsp;Young E, Prins M, Levine MN, Hirsh J: <i>Heparin binding to plasma proteins, an important mechanism for heparin resistance. </i>Thromb Haemost 1992; 67: 639&#150;643.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055686&pid=S1405-9940200600080001500005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">6.&nbsp;Cohen M, Arjomand H, Pollack CV Jr: <i>The evolution of thrombolytic therapy and adjunctive antithrombotic regimens in acute ST&#150;segment elevation myocardial infarction. </i>Am J Emerg Med 2004; 22: 14&#150;23.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055687&pid=S1405-9940200600080001500006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">7.&nbsp;Stec JJ, Silbershatz H, Tofler GH, Matheney TH, Sutherland P, Lipinska I, et al: <i>Association of fibrinogen with cardiovascular risk factors and cardiovascular disease in the framingham offspring population. </i>Circulation 2000; 102:1634&#150;1638.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055688&pid=S1405-9940200600080001500007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">8.&nbsp;Doolittle RF, Spraggon G, Everse SJ: <i>Three dimensional structural studies on fragments of fibrinogen and fibrin. </i>Curr Opin Struct Biol 1998; 8: 792&#150;798.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1055689&pid=S1405-9940200600080001500008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">9.&nbsp;Herrick S, Blanc&#150;Brude O, Gray A, Laurent G: <i>Fibrinogen. 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