<?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>S1405-99402003000100001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El fibrinógeno como factor de riesgo cardiovascular]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Izaguirre Ávila]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zaldívar Alcántara]]></surname>
<given-names><![CDATA[Helena]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Hematología ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2003</year>
</pub-date>
<volume>73</volume>
<numero>1</numero>
<fpage>7</fpage>
<lpage>10</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402003000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402003000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402003000100001&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Editorial</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>El fibrin&oacute;geno como factor de riesgo cardiovascular</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Ra&uacute;l Izaguirre &Aacute;vila* y Helena Zald&iacute;var Alc&aacute;ntara*</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Hematolog&iacute;a. Instituto Nacional de Cardiolog&iacute;a "Ignacio Ch&aacute;vez".</i></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>     ]]></body>
<body><![CDATA[<br>Ra&uacute;l Izaguirre &Aacute;vila.     <br>Departamento de Hematolog&iacute;a.     <br> Instituto Nacional de Cardiolog&iacute;a "Ignacio Ch&aacute;vez".     <br>(INCICH, Juan Badiano No. 1, Col. Secci&oacute;n XVI,     <br> Tlalpan, 14080 M&eacute;xico, D.F.).     <br>Correo electr&oacute;nico: <a href="mailto:rizagui@yahoo.com">rizagui@yahoo.com</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido: 24 de septiembre de 2002    <br>Aceptado: 14 de enero de 2003</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>Palabras clave:</b> Enfermedad arterial coronaria, Aterotrombosis, Fibrin&oacute;geno. </font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Coronary artery disease, Atherothrombosis, Fibrinogen.</font></p>     <p align="justify"><font face="verdana" size="2">(Arch Cardiol Mex 2003; 73:7&#45;10).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">El fibrin&oacute;geno (FG) es la prote&iacute;na de la coagulaci&oacute;n m&aacute;s abundante en la circulaci&oacute;n. Es precursor de la fibrina, principal componente del trombo. La concentraci&oacute;n plasm&aacute;tica de FG se incrementa durante la inflamaci&oacute;n, por lo que es considerado uno de los indicadores del estado inflamatorio.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>El fibrin&oacute;geno en la coagulaci&oacute;n y en la enfermedad arterial coronaria</b></font></p>     <p align="justify"><font face="verdana" size="2">La mol&eacute;cula de FG est&aacute; formada por tres pares de cadenas (&#945;, &#946;, &#947;), unidas por puentes de disulfuro. Los tres genes que codifican su s&iacute;ntesis se encuentran muy cercanos uno de otro en el cromosoma 4 y algunos estudios sugieren que la regulaci&oacute;n en la s&iacute;ntesis de las tres cadenas depende del gene de la cadena beta. El FG tiene una variaci&oacute;n condicionada gen&eacute;ticamente; de los cuatro haplotipos comunes de la cadena &#946;,<sup>1</sup> el polimorfismo gen&eacute;tico del alelo 455G &gt; A se ha asociado con mayores niveles plasm&aacute;ticos de FG. Los individuos con este alelo podr&iacute;an tener hasta un 40% m&aacute;s de riesgo para desarrollar un evento tromb&oacute;tico.<sup>2</sup> Tambi&eacute;n se ha especulado que algunos individuos tendr&iacute;an un genotipo que les har&iacute;a responder con mayor facilidad a los est&iacute;mulos inflamatorios externos que les colocar&iacute;a en un mayor riesgo de enfermedad arterial coronaria.<sup>3</sup> La interleucina 6 regula varios de los componentes de la respuesta inflamatoria y el polimorfismo del alelo 174G &gt; C del gene que codifica su s&iacute;ntesis se ha relacionado con un riesgo particular de trombosis<sup>4</sup> y enfermedad arterial coronaria.<sup>5</sup> Ambos alelos, del FG y de interleucina 6, estar&iacute;an involucrados en los niveles elevados de FG en el plasma y por lo tanto, con el mayor riesgo de sufrir enfermedad arterial coronaria. En poblaci&oacute;n europea se ha estimado que hasta el 2% de los individuos tendr&iacute;an esta combinaci&oacute;n patog&eacute;nica. Estos alelos no necesariamente se encuentran en otras poblaciones gen&eacute;ticamente diferentes y no hay suficientes estudios que los hayan explorado. </font></p>     <p align="justify"><font face="verdana" size="2">Desde el punto de vista fisiopatol&oacute;gico, se pueden identificar dos etapas en la participaci&oacute;n del FG en la enfermedad cardiovascular. Uno es durante la etapa aguda, en que contribuye a la aterotrombosis que sigue a la fractura de la placa aterosclerosa. El FG participa en la agregaci&oacute;n plaquetaria al unirse a la glucoprote&iacute;na IIb/IIIa para formar el puente de uni&oacute;n entre varias plaquetas. Se ha observado que los individuos con concentraciones elevadas de fibrin&oacute;geno tienen mayor agregabilidad plaquetaria inducida por ADP; &eacute;sta depende a su vez de variantes polim&oacute;rficas de la glucoprote&iacute;na IIIa.<sup>6</sup> En los siguientes d&iacute;as al infarto del miocardio, el FG se incrementa<sup>7</sup> como parte de la respuesta inflamatoria a la necrosis tisular y podr&iacute;a estar relacionado con los eventos de retrombosis y re&#45;infarto.<sup>8</sup> </font></p>     <p align="justify"><font face="verdana" size="2">La otra etapa es durante el desarrollo de la aterosclerosis. El FG se deposita en la pared arterial, sobre todo en los sitios de formaci&oacute;n de una placa aterosclerosa, donde es convertido a fibrina;<sup>9</sup> &eacute;sta se acumula, al igual que los productos de desintegraci&oacute;n de la fibrina, donde son un est&iacute;mulo para la migraci&oacute;n y proliferaci&oacute;n de c&eacute;lulas de m&uacute;sculo liso; con ello, el FG contribuye al crecimiento de la lesi&oacute;n. Existe una relaci&oacute;n directa de la concentraci&oacute;n de FG y de la viscosidad plasm&aacute;tica con la gravedad de enfermedad arterial coronaria,<sup>10,11</sup> y con la disminuci&oacute;n del flujo sangu&iacute;neo, particularmente en los sitios de estenosis vascular como los que produce la placa aterosclerosa.<sup>12</sup> La viscosidad plasm&aacute;tica tambi&eacute;n se incrementa por la agregaci&oacute;n eritroc&iacute;tica dependiente del FG. Los niveles plasm&aacute;ticos de FG se han relacionado con una mayor tendencia a formar fibrina en respuesta a la trombina y a generar trombos de mayor tama&ntilde;o, con una estructura que los hace resistentes a la acci&oacute;n fibrinol&iacute;tica.<sup>13</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>Fibrin&oacute;geno y riesgo cardiovascular</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En los &uacute;ltimos a&ntilde;os, el FG ha sido considerado un factor de riesgo cardiovascular. Numerosos estudios lo han relacionado tanto con la enfermedad arterial coronaria (EAC) como con otras formas de enfermedad aterotromb&oacute;tica (EAT), incluyendo enfermedad vascular cerebral,<sup>14,15</sup> y enfermedad arterial perif&eacute;rica.<sup>16</sup> El FG correlaciona con la progresi&oacute;n de las placas ateroscle&#45;rosas carot&iacute;deas y es predictivo de la gravedad de la aterosclerosis de la aorta tor&aacute;cica y de las placas silenciosas.<sup>17</sup> Hace m&aacute;s de 20 a&ntilde;os, Mea&#45;de<sup>18</sup> inform&oacute; que de 1,510 individuos mayores de 40 a&ntilde;os de edad, el 2% que murieron por infarto agudo del miocardio (IAM) en un per&iacute;odo de 6 a&ntilde;os, ten&iacute;an el FG incrementado en relaci&oacute;n a los que no ten&iacute;an enfermedad arterial coronaria. En otro informe,<sup>19</sup> los mismos autores comunicaron el seguimiento entre 7 y 13 a&ntilde;os de 1,511 hombres de raza blanca donde confirmaron que el FG es un factor de riesgo para EAC, con mayor valor predictivo que el colesterol; un incremento de FG en una desviaci&oacute;n est&aacute;ndar, se acompa&ntilde;&oacute; de un 84% de riesgo de sufrir IAM en los siguientes 5 a&ntilde;os, independientemente de la edad. De esos hallazgos se derivaron m&aacute;s de 30 estudios prospectivos que han relacionado al fibrin&oacute;geno con riesgo de sufrir enfermedad arterial coronaria. Un meta&#45;an&aacute;lisis publicado en 1993 revel&oacute; un riesgo relativo de eventos cardiovasculares de 2.45 (IC 95%, 2.05 a 2.93)<sup>20</sup> en el tercil superior de la concentraci&oacute;n de FG, comparado con el tercil inferior. Otro meta&#45;an&aacute;lisis encontr&oacute; un riesgo relativo de 1.8 (IC 95%, 1.6 a 2.0).<sup>21</sup> Estos datos han sido apoyados recientemente.<sup>22</sup> La concentraci&oacute;n de FG se asocia directamente con la historia de infarto agudo del miocardio y es un factor predictivo de mortalidad a corto plazo en este grupo de enfermos.<sup>23</sup> En individuos con enfermedad arterial cerebral o coronaria, el tratamiento con clopidogrel no reduce la concentraci&oacute;n plasm&aacute;tica de FG.<sup>24</sup> </font></p> 	    <p align="justify"><font face="verdana" size="2">El FG proporciona un riesgo adicional a los tres factores convencionales de riesgo cardiovascular m&aacute;s importantes (colesterol, hipertensi&oacute;n y tabaquismo) y es el factor predictivo de mayor peso tanto de mortalidad por causas cardiovasculares, como muerte por cualquier causa, a&uacute;n m&aacute;s que la TA y el colesterol. El estudio sobre prevenci&oacute;n de infarto agudo del miocardio con dosis bajas de aspirina, realizado entre m&eacute;dicos, mostr&oacute; que valores de FG superiores a 3.43 g/L duplican el riesgo de IAM, comparado con valores por debajo de esa concentraci&oacute;n.<sup>25</sup> Los factores de riesgo cardiovascular tienen diferente impacto sobre cada sexo y el FG en particular se incrementa m&aacute;s en la mujer en relaci&oacute;n a la edad.<sup>26</sup> En individuos de edad avanzada, la concentraci&oacute;n de FG tiene una relaci&oacute;n indirecta con la actividad f&iacute;sica.<sup>27</sup> Aunque el tabaquismo aumenta el riesgo de enfermedad cardiovascular, el incremento del riesgo por el FG es independiente del que proporciona el tabaquismo, que eleva los valores de FG en proporci&oacute;n directa al n&uacute;mero de cigarrillos por d&iacute;a.<sup>28</sup> Tambi&eacute;n existe una relaci&oacute;n directa entre los niveles de colesterol y el FG. La concentraci&oacute;n elevada de Lp (a) asociada al aumento del FG plasm&aacute;tico incrementa el riesgo cardiovascular a 2.5 (IC 95%, 1.2 a 5).<sup>29</sup> Por el contrario, el consumo moderado de alcohol los reduce. </font></p>     <p align="justify"><font face="verdana" size="2">Varios estudios han encontrado una variaci&oacute;n en la concentraci&oacute;n plasm&aacute;tica de FG durante las estaciones del a&ntilde;o.<sup>30</sup> Se incrementa durante el invierno y disminuye en el verano. En el estudio brit&aacute;nicose encontr&oacute; una relaci&oacute;n directa del incremento del FG con la cuenta de leucocitos, la prote&iacute;na C reactiva y las manifestaciones de infecci&oacute;n respiratoria, que son m&aacute;s frecuentes durante el invierno.<sup>31</sup> El estudio Rotterdam<sup>32</sup> no encontr&oacute; relaci&oacute;n con la diferencia de temperatura ambiental durante el cambio de estaci&oacute;n y observ&oacute; que el incremento de FG durante el invierno es mayor entre los sujetos mayores de 75 a&ntilde;os de edad que entre los de 55 a 75 a&ntilde;os. Esta variaci&oacute;n puede ser una causa m&aacute;s del incremento de la mortalidad por causas cardiovasculares de los ancianos durante el invierno.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>M&eacute;todos de determinaci&oacute;n del FG y riesgo cardiovascular</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En la mayor&iacute;a de los estudios sobre FG y riesgo cardiovascular se ha practicado la determinaci&oacute;n de la prote&iacute;na por el m&eacute;todo de Clauss, que se basa en la coagulaci&oacute;n del FG al a&ntilde;adir trombina a una muestra de plasma citratado. Existen otras t&eacute;cnicas que miden el FG, tanto por m&eacute;todos inmunol&oacute;gicos como por precipitaci&oacute;n. Las mediciones del FG tienen una elevada variabilidad individual, lo que representa un obst&aacute;culo para la estratificaci&oacute;n del riesgo cardiovascular.<sup>33</sup> Debido a que no existe una estandarizaci&oacute;n universal para la determinaci&oacute;n del FG, el valor predictivo que pueda tener la cuantificaci&oacute;n aislada del FG es limitado y sugiere que la medici&oacute;n rutinaria de FG en individuos sanos no indica necesariamente un riesgo elevado,<sup>34</sup> por lo que no se ha recomendado la determinaci&oacute;n rutinaria de fibrin&oacute;geno para evaluar el riesgo individual de trombosis.<sup>35</sup> Por otra parte, se ha observado que la determinaci&oacute;n del FG por inmunoprecipitaci&oacute;n tiene mayor correlaci&oacute;n con el riesgo cardiovascular que el m&eacute;todo coagulom&eacute;trico y que podr&iacute;a ser usado como una prueba para identificar a los individuos con mayor riesgo.<sup>36</sup> Ello indica que el potencial patog&eacute;nico del FG no s&oacute;lo depende de su capacidad para coagularse a fibrina, sino de su efecto sobre la viscosidad plasm&aacute;tica y a su dep&oacute;sito en la pared arterial.</font></p> 	    <p align="justify"><font face="verdana" size="2">Tanto la determinaci&oacute;n de FG por el m&eacute;todo de Clauss como por inmunoprecipitaci&oacute;n son procedimientos relativamente f&aacute;ciles en los actuales equipos coagulom&eacute;tricos y numerosos centros de atenci&oacute;n m&eacute;dica tienen la capacidad de medir el fibrin&oacute;geno plasm&aacute;tico; sin embargo, queda por dilucidar el mejor m&eacute;todo de laboratorio para su determinaci&oacute;n y su utilidad en estudios que correlacionen el riesgo cardiovascular con la exactitud de la medici&oacute;n por m&eacute;todos diferentes al de Clauss. Tambi&eacute;n falta por precisar el papel sin&eacute;rgico del FG con otros factores ex&oacute;genos y la relaci&oacute;n que guarda el incremento plasm&aacute;tico con los polimorfismos gen&eacute;ticos del mismo FG y de la interleucina 6, particularmente en poblaciones mestizas de Latinoam&eacute;rica. A&uacute;n persiste la interrogante si el incremento del FG observado en enfermedad arterial coronaria es primario y una causa m&aacute;s de la aterosclerosis, o si representa un fen&oacute;meno secundario, como parte del estado inflamatorio que acompa&ntilde;a a esta entidad nosol&oacute;gica.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
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