<?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>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762007000200010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Trastornos de coagulación en el cirrótico]]></article-title>
<article-title xml:lang="en"><![CDATA[Coagulation disorders in cirrhosis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Téllez-Ávila]]></surname>
<given-names><![CDATA[Felix I]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Tapia]]></surname>
<given-names><![CDATA[Norberto C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torre-Delgadillo]]></surname>
<given-names><![CDATA[Aldo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Departamento de Gastroenterología ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<volume>59</volume>
<numero>2</numero>
<fpage>153</fpage>
<lpage>160</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762007000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762007000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762007000200010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The liver plays a central role in the clotting process. In this organ are sintetizated the major part of the coagulation factors. Historically, was considered that alteration in liver function causes important bleeding disorders. However, actual evidence is not in agreement with this asseveration. Decreased synthesis of clotting and inhibitor factors, decrease clearance of activated factors, quantitative and qualitative platelet defects, hyperfibrinolysis and intravascular coagulation are some of the defects observed in liver diseases. Thrombotic events, even if rare in cirrhotic patients, occur manly in the portal and mesenteric veins. The aim of the present work is to review the present evidence in coagulation disorders and liver disease.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El hígado participa de manera importante en el proceso de la coagulación. En él se sintetizan la mayor parte de los factores pro- y anticoagulantes. De manera histórica se ha considerado que las alteraciones en la función de este órgano provoca trastornos predisponentes para eventos de sangrado. La evidencia actual pone en tela de juicio esta aseveración. En los casos de hepatopatía se hacen evidentes alteraciones en el número y funcionamiento de las plaquetas, disminución de la síntesis de factores de la coagulación, disfibrinogenemia, alteraciones en la fibrinólisis, deficiencia de vitamina K y cambios similares a los ocurridos en la coagulación intravascular diseminada (CID). El presente trabajo está dirigido a revisar los conocimientos actuales respecto a las alteraciones de la coagulación presentes en los pacientes con hepatopatías.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cirrhosis]]></kwd>
<kwd lng="en"><![CDATA[Coagulation]]></kwd>
<kwd lng="es"><![CDATA[Cirrosis]]></kwd>
<kwd lng="es"><![CDATA[Coagulación]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Rinc&oacute;n del residente</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Trastornos de coagulaci&oacute;n en el cirr&oacute;tico</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Coagulation disorders in cirrhosis</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Felix I. T&eacute;llez-&Aacute;vila,* Norberto C. Ch&aacute;vez-Tapia,* Aldo Torre-Delgadillo*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Gastroenterolog&iacute;a. Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n.</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>Reimpresos:</b><i>    <br>   </i><i>Dr. Aldo Torre-Delgadillo<b>    <br>   </b>Departamento de Gastroenterolog&iacute;a.    <br>   Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n.    <br>   Vasco de Quiroga, No. 15, Tlalpan, Col. Secci&oacute;n XVI    <br>   14080, M&eacute;xico, D.F.    <br>   Tel: 5487-0900, Ext. 2710</i>    <br> Correo electr&oacute;nico: <a href="mailto:detoal@yahoo.com">detoal@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 el 5 de octubre de 2006.     ]]></body>
<body><![CDATA[<br>   Aceptado el 8 de marzo de 2007.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>ABSTRACT</i></b></font></p>     <p align="justify"><font face="verdana" size="2"><i>The liver plays a central role in the clotting process. In this organ are sintetizated the major part of the coagulation factors. Historically, was considered that alteration in liver function causes important bleeding disorders. However, actual evidence is not in agreement with this asseveration. Decreased synthesis of clotting and inhibitor factors, decrease clearance of activated factors, quantitative and qualitative platelet defects, hyperfibrinolysis and intravascular coagulation are some of the defects observed in liver diseases. Thrombotic events, even if rare in cirrhotic patients, occur manly in the portal and mesenteric veins. The aim of the present work is to review the present evidence in coagulation disorders and liver disease.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key words. </i></b><i>Cirrhosis. Coagulation.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">El h&iacute;gado participa de manera importante en el proceso de la coagulaci&oacute;n. En &eacute;l se sintetizan la mayor parte de los factores pro- y anticoagulantes. De manera hist&oacute;rica se ha considerado que las alteraciones en la funci&oacute;n de este &oacute;rgano provoca trastornos predisponentes para eventos de sangrado. La evidencia actual pone en tela de juicio esta aseveraci&oacute;n. En los casos de hepatopat&iacute;a se hacen evidentes alteraciones en el n&uacute;mero y funcionamiento de las plaquetas, disminuci&oacute;n de la s&iacute;ntesis de factores de la coagulaci&oacute;n, disfibrinogenemia, alteraciones en la fibrin&oacute;lisis, deficiencia de vitamina K y cambios similares a los ocurridos en la coagulaci&oacute;n intravascular diseminada (CID). El presente trabajo est&aacute; dirigido a revisar los conocimientos actuales respecto a las alteraciones de la coagulaci&oacute;n presentes en los pacientes con hepatopat&iacute;as.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave. </b>Cirrosis. Coagulaci&oacute;n.</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">El h&iacute;gado tiene un papel clave en el proceso de la coagulaci&oacute;n, ya que representa el &oacute;rgano en el cual se sintetizan la mayor&iacute;a de los factores de la coagulaci&oacute;n as&iacute; como sus inhibidores. Por a&ntilde;os se ha considerado que alteraciones en el funcionamiento del h&iacute;gado provocan, a su vez, repercusiones en la coagulaci&oacute;n que pueden llegar a poner en riesgo la vida de los pacientes con alg&uacute;n padecimiento hep&aacute;tico.<sup>1</sup> Es bien conocido que los pacientes con hepatopat&iacute;as cr&oacute;nicas presentan de manera frecuente alteraciones en las pruebas de coagulaci&oacute;n, as&iacute; como episodios importantes de sangrados principalmente de origen gastrointestinal. El asociar estos dos fen&oacute;menos como causa-efecto ha sido hist&oacute;ricamente un fen&oacute;meno "natural". Debido a que las pruebas de coagulaci&oacute;n disponibles en la actualidad miden la actividad <i>in vi</i><i>tro </i>y no <i>in vivo<sup>1</sup> </i>de la coagulaci&oacute;n, as&iacute; como otros factores que se describir&aacute;n a continuaci&oacute;n, actualmente se cuestiona la importancia cl&iacute;nica de los defectos observados en los pacientes cirr&oacute;ticos.<sup>2</sup><sup>,3</sup> Las alteraciones de la hemostasia en los pacientes cirr&oacute;ticos se pueden observar a varios niveles en donde se involucran factores tanto procoagulantes como anticoagulantes: alteraciones en el n&uacute;mero y funcionamiento de las plaquetas, disminuci&oacute;n de la s&iacute;ntesis de factores de la coagulaci&oacute;n, disfibrinogenemia, alteraciones en la fibrin&oacute;lisis, deficiencia de vitamina K y cambios similares a los ocurridos en la coagulaci&oacute;n intravascular diseminada (CID).</font></p>     <p align="justify"><font face="verdana" size="2">El objetivo de este trabajo, m&aacute;s que realizar una disertaci&oacute;n, es presentar al lector las evidencias actuales sobre las alteraciones en los factores involucrados en el proceso de la coagulaci&oacute;n en los pacientes con hepatopat&iacute;a cr&oacute;nica.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ALTERACIONES PLAQUETARIAS</b></font></p>     <p align="justify"><font face="verdana" size="2">La trombocitopenia es una alteraci&oacute;n com&uacute;n en pacientes cirr&oacute;ticos. Se reporta con una frecuencia entre 30-64% de este grupo de pacientes.<sup>4</sup> La cifra generalmente es mayor de 30,000 plaquetas/mm<sup>3</sup> y no se asocia de manera frecuente con sangrados espont&aacute;neos. Se acepta que la causa de esta disminuci&oacute;n de las cifras plaquetarias en los pacientes con cirrosis es debido a la esplenomegalia, la cual a su vez, en este grupo de pacientes es secundaria a hipertensi&oacute;n portal. A pesar de esta disminuci&oacute;n en la cuenta perif&eacute;rica de plaquetas, la cifra total puede ser incluso normal y encontrarse hasta 90% del total secuestradas en el bazo, se sabe que a pesar de ello, estas plaquetas son capaces de participar de manera activa en el proceso de hemostasia. A pesar de lo anterior, no se ha podido demostrar una asociaci&oacute;n entre las dimensiones del bazo y la disminuci&oacute;n en la cuenta plaquetaria. La descompresi&oacute;n del sistema portal por cualquier m&eacute;todo (quir&uacute;rgico o espont&aacute;neo) no corrige esta alteraci&oacute;n,<sup>5</sup> por otro lado existen estudios en pacientes con cirrosis por virus C que demuestran que por medio de la embolizaci&oacute;n espl&eacute;nica parcial con microesferas es posible aumentar las cifras plaquetarias en sangre perif&eacute;rica;<sup>6,7</sup> se debe mencionar que hasta el momento se trata de estudios retrospectivos con un n&uacute;mero de pacientes peque&ntilde;o. El factor que parece tener mayor importancia es la disminuci&oacute;n de la producci&oacute;n de trombopoyetina (TPY), la cual es una citocina producida en el h&iacute;gado. La TPY es responsable de la maduraci&oacute;n de los megacariocitos y de la formaci&oacute;n de plaquetas maduras. Los niveles de esta citocina se encuentran disminuidos en pacientes con hepatopat&iacute;a cr&oacute;nica<sup>8</sup> y se ha observado que posterior al trasplante hep&aacute;tico sus cifras s&eacute;ricas aumentan de manera paulatina con la consecuente elevaci&oacute;n de las cifras plaquetarias<sup>9</sup> (<a href="#f1">Figura 1</a>). En un estudio realizado en pacientes con fibrosis/cirrosis por VHC tratados con interfer&oacute;n pegilado<sup>10</sup> se evalu&oacute; la respuesta de las cifras plaquetarias y de TPY en aquellos con respuesta viral sostenida, se demostr&oacute; que las cifras plaquetarias aumentaron de 15.5 &plusmn; 6.8 x 10<sup>4</sup> a 19.9 &plusmn; 5.8 xlO<sup>4</sup> (p &lt; 0.01); las cifras de TPY aumentaron de 1.65 &plusmn; 0.94 a 2.06 &plusmn; 1.22 fmol/mL (p = 0.073). Estos resultados son consistentes con datos obtenidos en otros estudios recientes.<sup>11</sup> Los datos anteriores sugieren que en los pacientes cirr&oacute;ticos la disminuci&oacute;n de la TPY secundaria a la disfunci&oacute;n hep&aacute;tica es responsable, al menos en parte, de la trombocitopenia observada. Otros factores estudiados en las alteraciones plaquetarias son la destrucci&oacute;n por mecanismos inmunol&oacute;gicos,<sup>12</sup> deficiencia de &aacute;cido f&oacute;lico<sup>13</sup> y el uso de alcohol.<sup>14</sup> La coexistencia de coagulaci&oacute;n intravascular diseminada, sepsis, falla hep&aacute;tica aguda y situaciones espec&iacute;ficas como el s&iacute;ndrome HELLP (hemolisis, elevaci&oacute;n de enzimas hep&aacute;ticas y plaquetas bajas) pueden contribuir a las alteraciones mencionadas.</font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/ric/v59n2/a10f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>DISMINUCI&Oacute;N DE LA S&Iacute;NTESIS DE FACTORES DE COAGULACI&Oacute;N</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El h&iacute;gado es el &oacute;rgano encargado de la s&iacute;ntesis de la mayor&iacute;a de los factores de coagulaci&oacute;n (<a href="/img/revistas/ric/v59n2/a10c1.jpg" target="_blank">Cuadro 1</a>). Cl&aacute;sicamente se ha relacionado la disminuci&oacute;n de los factores de la coagulaci&oacute;n con la gravedad del da&ntilde;o hep&aacute;tico y pron&oacute;stico de las enfermedades hep&aacute;ticas. Las pruebas utilizadas actualmente para la medici&oacute;n de la actividad de los factores de la coagulaci&oacute;n representan una actividad <i>"in vitro" </i>y no <i>"in vivo", </i>que s&oacute;lo se ven alteradas cuando los niveles plasm&aacute;ticos de los factores procoagulantes est&aacute;n por debajo de 30-40% de sus cifras normales. La medici&oacute;n de cada uno de los factores de manera independiente ha mostrado ser &uacute;til en algunas situaciones especiales. Los criterios del King's Collage para falla hep&aacute;tica fulminante refieren al TP mayor de 100 como un predictor importante de mortalidad, sin importar la etiolog&iacute;a.<sup>15</sup> La disminuci&oacute;n de la cantidad de factor V, con cifras totales menores a 20% (menores de 30 a&ntilde;os) y 30% (mayores de 30 a&ntilde;os) del normal, se han utilizado como criterio de trasplante hep&aacute;tico en pacientes con falla hep&aacute;tica fulminante y encefalopat&iacute;a hep&aacute;tica grados 3-4.<sup>16</sup></font></p>     <p align="justify"><font face="verdana" size="2">El TP se encuentra sin alteraciones o ligeramente prolongado en los estadios tempranos de la enfermedad hep&aacute;tica. A medida que avanza la enfermedad la importante disminuci&oacute;n de los factores de la v&iacute;a extr&iacute;nseca (principalmente el factor VII) se ven reflejados en el alargamiento del TP. Con el mayor avance de la enfermedad, los factores XI y XII tambi&eacute;n se ven afectados, con lo cual se puede observar una afecci&oacute;n manifestada con alargamiento del tiempo parcial de tromboplastina (TTP).<sup>17</sup> El TP es utilizado en varios modelos pron&oacute;sticos de la gravedad de la hepatopat&iacute;a (Child-Pugh, Mayo End-Stage Liver Disease &#91;MELD&#93;).<sup>18-</sup><sup>19</sup> El INR (International Normalized Ratio, raz&oacute;n normalizada internacional) se incluye en varios modelos de evaluaci&oacute;n de gravedad y pron&oacute;stico de las enfermedades hep&aacute;ticas como los mencionados. Este par&aacute;metro se cre&oacute; para disminuir la variabilidad de los resultados obtenidos entre los pacientes tratados con anticoagulantes orales cuando la medici&oacute;n se realiza en diferentes laboratorios con distintos reactivos. Hasta el momento no se ha validado el uso de INR en lugar del TP en pacientes con hepatopat&iacute;a cr&oacute;nica.<sup>20,</sup><sup>21</sup> Algunos factores de coagulaci&oacute;n pueden encontrarse con cifras normales o inclusive elevadas en el transcurso de una enfermedad hep&aacute;tica cr&oacute;nica. El factor VIII y el fibrin&oacute;geno debido a su s&iacute;ntesis extrahep&aacute;tica, disminuci&oacute;n de su depuraci&oacute;n hep&aacute;tica o bien, al ser reactantes de fase aguda, se encuentran en esta circunstancia.</font></p>     <p align="justify"><font face="verdana" size="2">Inhibidores habituales de la coagulaci&oacute;n sintetizados en el h&iacute;gado como antitrombina III (AT III), la prote&iacute;na C y la prote&iacute;na S se encuentran en niveles s&eacute;ricos por debajo de lo normal en las enfermedades hep&aacute;ticas cr&oacute;nicas.<sup>22</sup> En general estas alteraciones no se manifiestan como episodios de trombosis. Se piensa que lo anterior es consecuencia de un estado de "balance" al cual llegan estos pacientes al disminuir tanto los factores pro- como los anticoagulantes. Existen estudios que exponen datos contrarios a esta situaci&oacute;n, Northup, <i>et al.</i><sup>23 </sup>en un estudio de casos-controles realizado en pacientes cirr&oacute;ticos encontr&oacute; una prevalencia de 0.5% de trombosis venosa profunda y tromboembolia pulmonar. La alb&uacute;mina se document&oacute; como marcador &uacute;til para riesgo de trombosis independientemente de las cifras plaquetarias e INR.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>DISFIBRINOGENEMIA</b></font></p>     <p align="justify"><font face="verdana" size="2">La polimerizaci&oacute;n anormal de los mon&oacute;meros de fibrina es una anormalidad presente en 60-70% de los pacientes con cirrosis.<sup>24</sup> Esta polimerizaci&oacute;n deficiente se observa aun con cifras de TP, TTP y fibrin&oacute;geno normales. La disfibrinogenemia vista en los pacientes con cirrosis es un fen&oacute;meno reversible secundaria a un aumento en la actividad de la enzima sialiltransferasa debido a la reexpresi&oacute;n del gen fetal en los hepatocitos.<sup>25</sup> El resultado es una cantidad excesiva de residuos de &aacute;cido si&aacute;lico en la mol&eacute;cula de fibrin&oacute;geno que interfiere con la actividad enzim&aacute;tica de la trombina.<sup>25</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>HIPERFIBRIN&Oacute;LISIS</b></font></p>     <p align="justify"><font face="verdana" size="2">Los pacientes con cirrosis se encuentran en un estado persistente de hiperfibrin&oacute;lisis. Los estudios habituales como el TP y TTP no son capaces de detectar esta alteraci&oacute;n. La disminuci&oacute;n del tiempo de lisis de euglobina, aumento de d&iacute;mero-D y otros productos de degradaci&oacute;n de la fibrina, as&iacute; como el aumento del activador tisular del plasmin&oacute;geno en los pacientes cirr&oacute;ticos son marcadores de la presencia de esta alteraci&oacute;n. El inhibidor del activador del plasmin&oacute;geno, &alpha;<sub>2</sub>-antiplasmina y el inhibidor de la fibrin&oacute;lisis activable por trombina se encuentran en cifras normales o por debajo de su nivel normal.<sup>26,</sup><sup>27 </sup>El origen de este trastorno en pacientes con hepatopat&iacute;a avanzada se desconoce hasta el momento. Algunos autores proponen a la permeaci&oacute;n de ascitis hacia el torrente circulatorio como factor etiol&oacute;gico;<sup>28</sup> sin embargo, existen controversias al respecto.<sup>29</sup> El desarrollo de un estado de hiperfibrin&oacute;lisis en los pacientes con ascitis sometidos a derivaci&oacute;n del l&iacute;quido asc&iacute;tico hacia la circulaci&oacute;n general apoya el concepto. Otro dato importante a favor del probable papel etiol&oacute;gico de la ascitis es que la hiperfibrin&oacute;lisis se encuentra presente en 93% de los pacientes con ascitis comparado con 33% presente en pacientes con cirrosis sin ascitis.<sup>28</sup> La traslocaci&oacute;n bacteriana con presencia en el torrente sangu&iacute;neo de bacterias provenientes del tubo digestivo es otra de las probables etiolog&iacute;as.<sup>29</sup> La trascendencia cl&iacute;nica de estos trastornos sobre la tendencia al sangrado no est&aacute; claramente establecida.</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>DEFICIENCIA DE VITAMINA K</b></font></p>     <p align="justify"><font face="verdana" size="2">Esta alteraci&oacute;n no es secundaria a la patolog&iacute;a de base, pero se encuentra frecuentemente asociada con la hepatopat&iacute;a cr&oacute;nica. La desnutrici&oacute;n y la mala absorci&oacute;n de esta vitamina liposoluble son los principales factores asociados. La vitamina K requiere de sales biliares para su absorci&oacute;n, por lo cual la colestasis intra- o extrahep&aacute;tica puede afectar la misma. Los factores II, VII, IX y X, as&iacute; como las prote&iacute;nas C y S requieren de la presencia de vitamina K para su s&iacute;ntesis y funci&oacute;n adecuadas. La vitamina K es un cofactor para la &gamma;-carboxilaci&oacute;n de los residuos de &aacute;cido glut&aacute;mico en la regi&oacute;n amino terminal. Los residuos &gamma;-carboxilados permiten la uni&oacute;n de los iones calcio los cuales son esenciales para la adecuada actividad funcional de estos factores dependientes de vitamina K. En la hepatopat&iacute;a cr&oacute;nica, se observan niveles detectables de precursores descarboxilados de los factores K dependientes (PIVKA, por sus siglas en ingl&eacute;s, precursors induced by vitamin K absence), lo anterior en consistencia con lo expuesto.<sup>30</sup> La protrombina descarboxilada es posible detectarla en altas cantidades en pacientes con hepatocarcinoma, la cual es id&eacute;ntica desde el punto antig&eacute;nico a la presente en pacientes que reciben tratamiento con anticoagulantes orales. Esta mol&eacute;cula ha sido postulada como un marcador tumoral del carcinoma hepatocelular.<sup>31</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>COAGULACI&Oacute;N INTRAVASCULAR DISEMINADA (CID)</b></font></p>     <p align="justify"><font face="verdana" size="2">La cirrosis descompensada comparte algunas anormalidades de la coagulaci&oacute;n con el patr&oacute;n observado en la CID. Lo anterior ha llevado a postular un estado persistente de CID de bajo grado en estos pacientes.<sup>32</sup> Este concepto es materia de serias controversias.<sup>33</sup> Nuevos estudios de laboratorio como la determinaci&oacute;n de los fragmentos de protrombina F1 + 2, fibrinop&eacute;ptido A, fibrina soluble, d&iacute;mero-D, complejo trombina-antitrombina, entre otros, permitieron el reconocimiento de una coagulaci&oacute;n intravascular acelerada y fibrin&oacute;lisis (CIAF) en los pacientes con cirrosis.<sup>34</sup> Esta CIAF no es parte de la cirrosis "estable", pero se observa hasta en 30% de los pacientes con cirrosis descompensada y se asocia con el grado de gravedad de la enfermedad.<sup>33</sup> El diagn&oacute;stico de CID en los pacientes cirr&oacute;ticos es de especial dificultad y se basa en la presencia de un evento desencadenante, deterioro progresivo del paciente, reducci&oacute;n desproporcionada de factor V y disminuci&oacute;n de factor VIII (previamente normal).</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">Las alteraciones de la coagulaci&oacute;n en pacientes con cirrosis se manifiestan generalmente por eventos de sangrado. No obstante, la presencia de complicaciones tromb&oacute;ticas a diferentes niveles es un fen&oacute;meno bien reconocido en pacientes con hepatopat&iacute;a cr&oacute;nica.<sup>35</sup> La localizaci&oacute;n m&aacute;s frecuente de trombosis en los pacientes cirr&oacute;ticos es la vena porta y las venas mesent&eacute;ricas. La prevalencia de trombosis portal no neopl&aacute;sica oscila de 8 a 16%.<sup>36</sup> Entre los factores etiol&oacute;gicos propuestos para este estado protromb&oacute;tico se encuentran la estasis provocada por la hipertensi&oacute;n portal y algunos de origen gen&eacute;tico no relacionados desde el punto de vista etiol&oacute;gico con la hepatopat&iacute;a, como alteraciones en el factor V<sup>37</sup> y la mutaci&oacute;n G20210A en la protrombina.<sup>38,</sup><sup>39</sup></font></p>     <p align="justify"><font face="verdana" size="2">En las <a href="#f2">figuras 2</a> y <a href="#f3">3</a> se ilustran los diferentes mecanismos involucrados en los trastornos de coagulaci&oacute;n en los pacientes cirr&oacute;ticos, as&iacute; como el "balance" alcanzado.</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/ric/v59n2/a10f2.jpg"></font></p>     <p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/ric/v59n2/a10f3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>TRATAMIENTO</b></font></p>     <p align="justify"><font face="verdana" size="2">El sangrado espont&aacute;neo no relacionado con hipertensi&oacute;n portal es un fen&oacute;meno poco com&uacute;n en los pacientes cirr&oacute;ticos a pesar de las alteraciones mencionadas. El tratamiento de los trastornos en la coagulaci&oacute;n en los pacientes cirr&oacute;ticos se encuentra justificado s&oacute;lo en situaciones espec&iacute;ficas: sangrado activo persistente, antes de procedimientos diagn&oacute;sticos o de tratamiento invasivos y estados prequir&uacute;rgicos. Los productos disponibles para la correcci&oacute;n de estas alteraciones incluyen derivados hematol&oacute;gicos y no hematol&oacute;gicos.</font></p>     <p align="justify"><font face="verdana" size="2">El plasma fresco congelado (PFC) contiene todos los factores e inhibidores de la coagulaci&oacute;n. La dosis recomendada es de 10-20 mL/kg peso. El efecto del PFC es de inicio r&aacute;pido, pero dura un m&aacute;ximo de 12-24 horas. La administraci&oacute;n est&aacute; indicada en casos de sangrado persistente para lograr un INR por debajo de 2<sup>40</sup> o para corregir el TP por arriba de cuatro segundos.<sup>41</sup> Cuando no corrigen los tiempos de coagulaci&oacute;n a pesar de la administraci&oacute;n adecuada de PFC se debe considerar la posibilidad de CID. En ocasiones, la cantidad necesaria de PFC podr&iacute;a ser considerada como contraindicada en algunos pacientes con sangrado variceal activo, ya que en este grupo de pacientes se considera manejarlos con una "hipotensi&oacute;n permisiva", por el riesgo de persistencia o mayor cantidad de sangrado al aumentar la presi&oacute;n en el flujo portal.<sup>42</sup> Por otro lado, no debe ignorarse el riesgo de infecciones trasmitidas por este medio as&iacute; como otras complicaciones secundarias a su administraci&oacute;n.<sup>43</sup></font></p>     <p align="justify"><font face="verdana" size="2">El uso de crioprecipitados se justifica en los casos de CID con un fibrin&oacute;geno menor de 100 mg/dL. Se recomienda utilizar una unidad de crioprecipitado por cada 10 kg de peso, con lo cual se espera un incremento aproximado de 50 mg/dL. Los crioprecipitados contienen factor VIII, fibrin&oacute;geno, vWF, fibronectina y factor XIII. En pacientes en los cuales el manejo de l&iacute;quidos es un problema, el uso de crioprecipitados parece ser una alternativa &uacute;til.<sup>44</sup></font></p>     <p align="justify"><font face="verdana" size="2">El uso de factor VII recombinante representa actualmente una alternativa prometedora en los pacientes con cirrosis.<sup>45</sup> Existen estudios donde el uso de factor Vila ha mostrado reducir la necesidad de paquetes globulares en pacientes sometidos a trasplante hep&aacute;tico,<sup>46</sup> reduce la intensidad del sangrado en pacientes con trasplante hep&aacute;tico complicado<sup>47</sup> y en pacientes con sangrado variceal agudo;<sup>48</sup> en casos de falla hep&aacute;tica fulminante ha demostrado ser de utilidad para la correcci&oacute;n de la coagulopat&iacute;a.<sup>49 </sup>No obstante lo anterior, la evidencia de su utilidad cl&iacute;nica real a&uacute;n no se encuentra clara.<sup>21,</sup><sup>50</sup></font></p>     <p align="justify"><font face="verdana" size="2">La transfusi&oacute;n de plaquetas se encuentra justificada s&oacute;lo en ciertos escenarios. Su uso profil&aacute;ctico s&oacute;lo se justifica en pacientes que ser&aacute;n sometidos a alg&uacute;n procedimiento invasivo y cifras menores de 60,000/mm<sup>3</sup>. Un concentrado plaquetario incrementa la cuenta perif&eacute;rica aproximadamente en 10,000/ mm<sup>3</sup>. La dosis recomendada es un concentrado por cada 10 kg/peso.<sup>51</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La deficiencia de vitamina K en el paciente cirr&oacute;tico no es consecuencia directa de la enfermedad hep&aacute;tica. En casos donde se encuentra asociada a la misma, la administraci&oacute;n de 30 mg de vitamina K en una sola dosis o dividida en tres diferentes puede corregir el TP. La administraci&oacute;n intravenosa tiene efecto r&aacute;pido (6-8 horas). La administraci&oacute;n subcut&aacute;nea no tiene una absorci&oacute;n uniforme por lo cual no se recomienda. Existen presentaciones para su administraci&oacute;n oral como el bifosfato de menadiol.</font></p>     <p align="justify"><font face="verdana" size="2">Agentes antifibrinol&iacute;ticos como la protinina, el &aacute;cido epsilon aminocaproico y &aacute;cido tranex&aacute;mico han sido utilizados en estos pacientes. Su mecanismo de acci&oacute;n es por medio de la inhibici&oacute;n de la activaci&oacute;n del plasmin&oacute;geno y la actividad de la plasmina. Estos medicamentos han probado reducir las p&eacute;rdidas sangu&iacute;neas y los requerimientos transfusionales durante las cirug&iacute;as de h&iacute;gado y el trasplante hep&aacute;tico.<sup>52,</sup><sup>54</sup></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. Tripodi A, Salermo F, Chantarangkul V, Clerici M, Cazzaniga M, Primignani M, Manucci PM. 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<label>54</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dalmau]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Sabate]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Acosta]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Tranexamic acid reduces red cell transfusion better than epsilon-aminocaproic acid or placebo in liver transplantation]]></article-title>
<source><![CDATA[Anesth Analg]]></source>
<year>2000</year>
<numero>91</numero>
<issue>91</issue>
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</back>
</article>
