<?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>0121-4004</journal-id>
<journal-title><![CDATA[Vitae]]></journal-title>
<abbrev-journal-title><![CDATA[Vitae]]></abbrev-journal-title>
<issn>0121-4004</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Química Farmacéutica, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-40042009000100016</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Antiagregantes plaquetarios: mecanismos de acción y riesgos asociados al uso]]></article-title>
<article-title xml:lang="en"><![CDATA[Platelet antiaggregants: mechanisms of action and use asocied risks]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PALOMO G]]></surname>
<given-names><![CDATA[Iván F]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[TORRES U]]></surname>
<given-names><![CDATA[Constanza I]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MOORE-CARRASCO]]></surname>
<given-names><![CDATA[Rodrigo E]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ALARCÓN L]]></surname>
<given-names><![CDATA[Marcelo A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MARAGAÑO L]]></surname>
<given-names><![CDATA[Patricio J]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Talca Facultad de Ciencias de la Salud Departamento de Bioquímica Clínica e Inmunohematología]]></institution>
<addr-line><![CDATA[Talca ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2009</year>
</pub-date>
<volume>16</volume>
<numero>1</numero>
<fpage>133</fpage>
<lpage>143</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-40042009000100016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-40042009000100016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-40042009000100016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las Enfermedades Cardiovasculares son la principal causa de muerte en el mundo. Junto con los esfuerzos en disminuir los factores de riesgo cardiovascular, se recurre a diversos medicamentos para disminuir la morbimortalidad asociada a estas enfermedades, entre otros fármacos se utilizan, antihipertensivos, antidiabéticos, hipolipimiantes y antiagregantes plaquetarios. Dada la participación de las plaquetas, tanto en las etapas precoces de la aterogénesis como en la trombosis arterial, el uso de antiagregantes plaquetarios es muy relevante en la prevención primaria y secundaria de las trombosis arteriales. Los antiagregantes plaquetarios son utilizados en prevención primaria y secundaria de ECV. En esta revisión, se abordan diversos aspectos relativos a los antiagregantes, especialmente mecanismo de acción y riesgos asociados al uso durante los últimos 10 años. Como fuente bibliográfica se utilizó principalmente <A HREF="http://www.pubmed.com/">www.pubmed.com</A>; y los términos utilizados en la búsqueda fueron: antiagregantes plaquetarios, aspirina, dipiridamol, clopidogrel, abciximab, entre otros; luego se buscaron los textos completos de los artículos que interesaban y además se utilizaron algunos libros de hematología.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Cardiovascular diseases are the main cause of death in the world. Next to efforts to reduce the cardiovascular risk factors, several drugs are resorted to decrease morbimortality associated to these diseases: antihypertensive, antidiabetic, hypolipemiant and platelet antiaggregant drugs are used among others. Due to the participation of platelets, not only in the early stages of the atherogenesis but also in the artery thromboses, the use of platelet antiaggregant drugs is very relevant in the primary and secondary prevention of the artery thrombosis. In this review, after a brief description of the primary hemostasis, aspects of antiplatelet like mechanisms of action and use asocied risks during the last 10 years are adressed. Primarily literature source was <A HREF="http://www.pubmed.com/">www.pubmed.com</A>. The terms used in the search were: platelet antiaggregant, aspirin, dipyridamole, clopidogrel, abciximab, among others, then we searched the full texts of articles of interest and also used some hematology books.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[antiagregantes plaquetarios]]></kwd>
<kwd lng="es"><![CDATA[enfermedades cardiovasculares]]></kwd>
<kwd lng="en"><![CDATA[platelet antiaggregants]]></kwd>
<kwd lng="en"><![CDATA[cardiovascular diseases]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>REVISIONES</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>Antiagregantes plaquetarios: mecanismos  de acci&oacute;n y riesgos asociados al uso </b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Platelet antiaggregants: mechanisms of  action and use asocied risks</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Iv&aacute;n F. PALOMO G.<sup>1<a name="ast02" id="ast02"></a><a href="#ast01">*</a></sup>; Constanza I. TORRES U.<sup>1<a href="#ast01">*</a></sup>; Rodrigo E. MOORE-CARRASCO.<sup>1</sup>; Marcelo A. ALARC&Oacute;N L.<sup>1</sup>; Patricio J. MARAGA&Ntilde;O L.<sup>1, 2</sup></b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sup>1</sup>Programa  de Investigaci&oacute;n en Factores de Riesgo de Enfermedad Cardiovascular  (PIFRECV), Departamento de Bioqu&iacute;mica Cl&iacute;nica e Inmunohematolog&iacute;a,  Facultad de Ciencias de la Salud, Universidad de Talca. P.O. box: 747.  Talca, Chile<br /> <sup>2</sup>Unidad de Cardiolog&iacute;a, Hospital Regional de Talca, Chile </font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p> <hr size="1" noshade="noshade"/>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN </b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Las  Enfermedades Cardiovasculares son la principal causa de muerte en el  mundo. Junto con los esfuerzos en disminuir los factores de riesgo  cardiovascular, se recurre a diversos medicamentos para disminuir la  morbimortalidad asociada a estas enfermedades, entre otros f&aacute;rmacos se  utilizan, antihipertensivos, antidiab&eacute;ticos, hipolipimiantes y  antiagregantes plaquetarios. Dada la participaci&oacute;n de las plaquetas,  tanto en las etapas precoces de la aterog&eacute;nesis como en la trombosis  arterial, el uso de antiagregantes plaquetarios es muy relevante en la  prevenci&oacute;n primaria y secundaria de las trombosis arteriales. Los  antiagregantes plaquetarios son utilizados en prevenci&oacute;n primaria y  secundaria de ECV. En esta revisi&oacute;n, se abordan diversos aspectos  relativos a los antiagregantes, especialmente mecanismo de acci&oacute;n y  riesgos asociados al uso durante los &uacute;ltimos 10 a&ntilde;os. Como fuente  bibliogr&aacute;fica se utiliz&oacute; principalmente <a href="http://www.pubmed.com" target="_blank">www.pubmed.com</a>; y los t&eacute;rminos  utilizados en la b&uacute;squeda fueron: <i>antiagregantes plaquetarios</i>, <i>aspirina</i>, <i>dipiridamol</i>, <i>clopidogrel</i>, <i>abciximab, </i>entre  otros; luego se buscaron los textos completos de los art&iacute;culos que  interesaban y adem&aacute;s se utilizaron algunos libros de hematolog&iacute;a. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Palabras clave</b>: antiagregantes plaquetarios, enfermedades cardiovasculares. </font></p> <hr size="1" noshade="noshade"/>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ABSTRACT </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Cardiovascular  diseases are the main cause of death in the world. Next to efforts to  reduce the cardiovascular risk factors, several drugs are resorted to  decrease morbimortality associated to these diseases: antihypertensive,  antidiabetic, hypolipemiant and platelet antiaggregant drugs are used  among others. Due to the participation of platelets, not only in the  early stages of the atherogenesis but also in the artery thromboses,  the use of platelet antiaggregant drugs is very relevant in the primary  and secondary prevention of the artery thrombosis. In this review,  after a brief description of the primary hemostasis, aspects of  antiplatelet like mechanisms of action and use asocied risks during the  last 10 years are adressed. Primarily literature source was <a href="http://www.pubmed.com" target="_blank">www.pubmed.com</a>.  The terms used in the search were: platelet antiaggregant, aspirin,  dipyridamole, clopidogrel, abciximab, among others, then we searched  the full texts of articles of interest and also used some hematology  books. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Key words: </b>platelet antiaggregants, cardiovascular diseases. </font></p> <hr size="1" noshade="noshade"/>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODUCCI&Oacute;N </b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los  antiagregantes plaquetarios son utilizados en la prevenci&oacute;n secundaria  de las enfermedades cardiovasculares (ECV) (1). En esta revisi&oacute;n,  despu&eacute;s de una breve descripci&oacute;n de la hemostasia primaria, se abordan  diversos aspectos relativos a los antiagregantes, fundamentalmente su  mecanismo de acci&oacute;n y sus efectos adversos. Como fuentes bibliogr&aacute;ficas  se utiliz&oacute; principalmente <a href="http://www.pubmed.com" target="_blank">www.pubmed.com</a>; los t&eacute;rminos utilizados en la  b&uacute;squeda fueron: <i>antiagregantes plaquetarios</i>, <i>aspirina</i>, <i>dipiridamol</i>, <i>clopidogrel</i>, <i>abciximab, </i>entre  otros; luego se buscaron los textos completos de los art&iacute;culos que  interesaban y adem&aacute;s se utilizaron algunos libros de hematolog&iacute;a. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Hemostasia primaria </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La  hemostasia es un proceso complejo que previene la p&eacute;rdida espont&aacute;nea de  sangre y detiene la hemorragia. Cl&aacute;sicamente se ha clasificado este  proceso en hemostasia primaria, coagulaci&oacute;n y fibrin&oacute;lisis. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En  la hemostasia primaria las plaquetas cumplen un rol fundamental. &Eacute;stas  son elementos celulares anucleados de 1.5-3 &mu;m de di&aacute;metro que se  originan por fragmentaci&oacute;n del citoplasma de los megacariocitos (2-4).  El proceso en el que participan se puede separar en adhesi&oacute;n, secreci&oacute;n  y agregaci&oacute;n plaquetaria (<a href="#fig01">V&eacute;ase figura 1</a>). Adem&aacute;s de participar en la  hemostasia primaria, las plaquetas activadas presentan actividad  procoagulante al exponer fosfol&iacute;pidos ani&oacute;nicos (5), y sintetizar y  expresar factor tisular (6). En los &uacute;ltimos a&ntilde;os se ha demostrado que  las plaquetas no s&oacute;lo participan en las complicaciones tromb&oacute;ticas de  la aterosclerosis, sino tambi&eacute;n en la iniciaci&oacute;n y progresi&oacute;n de la  placa ateromatosa (7). En este sentido, las plaquetas representan el  puente de uni&oacute;n entre inflamaci&oacute;n y trombosis, procesos fundamentales  en el desarrollo de la aterotrombosis. </font></p>     <p>&nbsp;</p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="fig01" id="fig01"></a><a href="/img/revistas/vitae/v16n1/a16fig01.gif"><img src="/img/revistas/vitae/v16n1/a16fig01th.gif" border="2" /></a></font></p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Figura 1.</b> Representaci&oacute;n esquem&aacute;tica de la participaci&oacute;n de las plaquetas en la  hemostasia primaria. Se muestran las principales mol&eacute;culas de las  plaquetas, de la matriz subendotelial y plasma que participan en los  procesos de adhesi&oacute;n, secreci&oacute;n y agregaci&oacute;n plaquetaria. (Adaptado de  Aldunate y Vial) (18). </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Enzimas plaquetarias </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La  activaci&oacute;n plaquetaria es un proceso modulado din&aacute;micamente por se&ntilde;ales  activantes e inhibidoras a las que se encuentra expuesta la superficie  de la c&eacute;lula (8). </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Las  plaquetas poseen diversos mecanismos y estrategias por los que los  est&iacute;mulos extracelulares se transmiten al interior de la c&eacute;lula, lo que  resulta en una respuesta funcional apropiada. Esto se lleva a cabo con  la participaci&oacute;n de mecanismos complejos y altamente coordinados de  transmisi&oacute;n de se&ntilde;ales que incluyen: receptores, activaci&oacute;n de  prote&iacute;nas que unen nucle&oacute;tidos de guanina (prote&iacute;nas G), metabolismo  del fosfatid&iacute;linositol, metabolismo del &aacute;cido araquid&oacute;nico, movimientos  de calcio, reorganizaci&oacute;n del citoesqueleto y diversos procesos de  fosforilaci&oacute;n de prote&iacute;nas (9). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Entre otras enzimas participan: (a) fosfolipasa C, que desdobla el fosfatidilinositol 4,5 difosfato (PIP<sub>2</sub>) en diacilglicerol (DAG) e inositol trifosfato (IP<sub>3</sub>); (b) fosfolipasa A<sub>2</sub>,  que libera &aacute;cido araquid&oacute;nico (AA) de los fosfol&iacute;pidos de la membrana  plaquetaria; (c) ciclooxigenasa (COX-1), que metaboliza el AA a  endoper&oacute;xidos c&iacute;clicos PGG<sub>2</sub>/PGH<sub>2</sub>; (d) tromboxano sintetasa, que transforma los endoper&oacute;xidos en tromboxano A <sub>2</sub>    (TXA<sub>2</sub>);  (e) adenilciclasa, que genera adenosin monofosfato (AMP) c&iacute;clico (cAMP)  a partir de adenosin trifosfato (ATP); (f) fosfodiesterasa, que  transforma cAMP en AMP; y (g) cinasas (prote&iacute;na cinasa C, MAP cinasas,  tirosina cinasas y cinasas lip&iacute;dicas) que participan en los procesos de  transducci&oacute;n de se&ntilde;ales en el citosol plaquetario (5, 10). </font></p>      <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Glicoprote&iacute;nas plaquetarias </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Muchos  de los procesos en que participan las plaquetas son mediados por las  glicoprote&iacute;nas (GP) de membrana (5, 8). Las glicoprote&iacute;nas GPIa-IIa,  GPIV y GPVI, participan en la adhesi&oacute;n plaquetaria al col&aacute;geno de la  matriz subendotelial (5, 11, 12). El complejo GPIb-IX-V (5, 13) act&uacute;a  como receptor del Factor von Willebrand (FVW), interacci&oacute;n esencial en  el fen&oacute;meno de adhesi&oacute;n de las plaquetas a la pared del vaso da&ntilde;ado y  tambi&eacute;n juega un papel importante en la activaci&oacute;n de las plaquetas por  la trombina. El complejo GPIIb-IIIa (5, 14) es receptor para el  fibrin&oacute;geno, FVW, fibronectina y vitronectina. Una vez activadas las  plaquetas, la GPIIb-IIIa sufre un cambio conformacional que permite la  exposici&oacute;n de un dominio que reconoce la secuencia RGD (Arg-Gly-Asp)  presente en fibrin&oacute;geno lo que permite la agregaci&oacute;n plaquetaria. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Receptores no glicoproteicos. </b>Desde   un punto de vista funcional, a los receptores no glicoproteicos se les puede clasificar en receptores activadores (receptores de ADP: P2Y<sub>1 </sub>y P2Y<sub>12</sub>, receptores activados por proteasas, trombina: PAR1 y PAR4, y receptor de TXA<sub>2</sub>) y receptores inhibidores (receptores para prostaglandinas I<sub>2 </sub>o prostaciclina, E<sub>1</sub> y D<sub>2</sub>, y adenosina (5, 15). </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ANTIAGREGANTES   PLAQUETARIOS</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El  uso m&aacute;s frecuente de los f&aacute;rmacos antiplaquetarios es la prevenci&oacute;n  primaria o secundaria de la trombosis arterial, preferentemente el  infarto agudo de miocardio (IAM), en el que las plaquetas, ante la  ruptura o erosi&oacute;n de las placas ateroscler&oacute;ticas en las arterias  coronarias, se agregan formando un trombo que obstruye la circulaci&oacute;n  sangu&iacute;nea. Un balance favorable entre los efectos ben&eacute;ficos y las  complicaciones de la terapia antiplaquetaria se alcanza al tratar  pacientes en los cuales el riesgo tromb&oacute;tico supera los riesgos de  complicaciones hemorr&aacute;gicas (16, 17). A continuaci&oacute;n se mencionan los  principales f&aacute;rmacos antiplaquetarios clasificados en dos grupos seg&uacute;n  su mecanismo de acci&oacute;n: inhibidores de enzimas plaquetarias e  inhibidores de receptores plaquetarios (V&eacute;anse <a href="#t01">tabla 1</a> y <a href="#fig02">figura 2</a>). </font></p>     <p>&nbsp;</p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="t01" id="t01"></a><img src="/img/revistas/vitae/v16n1/a16t01.gif" /></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b><b>Tabla 1. </b></b>Clasificacion de los principales antiagregantes plaquetarios seg&uacute;n mecanismo de acci&oacute;n. </font></p>     <p>&nbsp;</p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="fig02" id="fig02"></a><a href="/img/revistas/vitae/v16n1/a16fig02.gif"><img src="/img/revistas/vitae/v16n1/a16fig02th.gif" border="2" /></a></font></p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Figura   2. Representaci&oacute;n esquem&aacute;tica de los mecanismos de   acci&oacute;n de los f&aacute;rmacos antiplaquetarios en uso. </b>Se muestran las enzimas (ciclooxigenasa y fosfodiesterasa) y receptores (P2Y<sub>1</sub>, P2Y<sub>12</sub>; GPIIb-IIIa; PAR1, PAR4) inhibidos por los antiagregantes plaquetarios. Adaptado de Santos <i>et al</i> (5).</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Inhibidores de enzimas plaquetarias </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Inhibidores de ciclooxigenasa </i></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Aspirina </b>(<a href="#fig03">V&eacute;ase  figura 3</a>). La aspirina (&aacute;cido acetil salic&iacute;lico) act&uacute;a inhibiendo la  acci&oacute;n de la ciclooxigenasa (COX-1 y COX-2) (<a href="#fig02">V&eacute;ase figura 2</a>). Al  inhibir la COX-1 disminuye la s&iacute;ntesis de TXA<sub>2</sub> y,  como consecuencia, la agregaci&oacute;n plaquetaria. Por su parte, la  inhibici&oacute;n de la COX-2, con su efecto anti-inflamatorio, disminuye la  inflamaci&oacute;n vascular en el sitio de la placa ateromatosa y eso, a su  vez, reduce la infiltraci&oacute;n de c&eacute;lulas mononucleares en la placa  ateromatosa (15, 18). La terapia con aspirina ha sido reconocida como  una herramienta efectiva en el manejo de pacientes con angina  inestable. Estudios han mostrado un 40% en la reducci&oacute;n de IAM fatales  y no fatales (17, 19). Los efectos adversos m&aacute;s comunes de la aspirina  son los trastornos gastrointestinales (n&aacute;useas, ardor gastrointestinal,  dolor epig&aacute;strico, etc), que generalmente son dosis-dependiente (20).  Adem&aacute;s puede provocar hemorragias, siendo la m&aacute;s frecuente a nivel  digestivo alto (21). Por otra parte, a nivel de la mucosa g&aacute;strica  inhibe la s&iacute;ntesis de prostaglandinas, mol&eacute;culas que disminuyen la  secreci&oacute;n &aacute;cida (20). La aspirina se ha convertido en el  antiplaquetario de referencia y su tratamiento debe iniciarse tan  pronto como sea posible despu&eacute;s de la aparici&oacute;n de un evento agudo y  continuarse indefinidamente, salvo que est&eacute; contraindicado por alergia,  complicaciones gastrointestinales o hemorragia (22). La aspirina debe  ser usada con cautela en pacientes con antecedentes de &uacute;lcera p&eacute;ptica,  gastritis y alteraciones de la hemostasia. Tambi&eacute;n debe limitarse su  uso en enfermos con trastornos hep&aacute;ticos o renales y en estados de  hipovolemia, pues se incrementa el riesgo de manifestaciones t&oacute;xicas,  as&iacute; como su interacci&oacute;n con otros medicamentos que se unen a prote&iacute;nas  (ej. tiroxina, penicilina s&oacute;dica, fenito&iacute;na), ya que la dosis requerida  de estos f&aacute;rmacos se ve modificada (18). La respuesta a la aspirina  presenta variabilidad interindividual, lo que se explica entre otras  razones por las siguientes: hiperlipidemia, hiperglicemia, tabaquismo,  ejercicio, s&iacute;ndromes coronarios agudos (SCA), falla card&iacute;aca,  absorci&oacute;n, otros medicamentos y polimorfismos (23, 24). Por  &ldquo;resistencia a la aspirina&rdquo; se ha entendido que &eacute;sta no es capaz de:  (a) proteger a los individuos de las complicaciones tromb&oacute;ticas, (b)  causar una prolongaci&oacute;n del tiempo de sangr&iacute;a, (c) reducir la  producci&oacute;n de TXA<sub>2</sub> o (d) producir efecto antiplaquetario en uno o m&aacute;s ensayos de funci&oacute;n plaquetaria <i>in vitro </i>(25-28).  Algunos autores han llegado a establecer un muy elevado porcentaje de  &ldquo;resistencia a la aspirina&rdquo;, siendo &eacute;sta m&aacute;s frecuente en mujeres y  ancianos (29). </font></p>     <p>&nbsp;</p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="fig03" id="fig03"></a><img src="/img/revistas/vitae/v16n1/a16fig03.gif" /></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Figura 3. Estructura de inhibidores de enzimas plaquetarias. </b>De  ciclooxigenasa (Aspirina, Trifusal y Nitro-aspirina) y fosfodiesterasa  (Dipiridamol y Cilostazol). Adaptado de referencias 16, 33, 34 y 41.</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Triflusal </b>(Trifluorosalic&iacute;lico)  (30). Presenta similitudes estructurales con los salicilatos (<a href="#fig03">V&eacute;ase  figura 3</a>) (31, 32), pero no es derivado de la aspirina. Trifusal  bloquea irreversiblemente la COX-1 (<a href="#fig02">V&eacute;ase figura 2</a>) e inhibe s&oacute;lo  ligeramente la COX-2, de manera que la s&iacute;ntesis de prostaciclina s&oacute;lo  se reduce levemente (33-35). Adem&aacute;s, tanto triflusal como su metabolito  activo, el &aacute;cido 2-hidroxi-4-trifluorometilbenzoico (HTB), inhiben la  degradaci&oacute;n de cAMP plaquetario y endotelial disminuyendo la activaci&oacute;n  plaquetaria e interacci&oacute;n con c&eacute;lulas endoteliales (36-38). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Triflusal  tiene un rol en la prevenci&oacute;n primaria de eventos cerebrovasculares, en  fibrilaci&oacute;n atrial y en la prevenci&oacute;n secundaria de infartos cerebrales  e IAM, principalmente como alternativa a la aspirina (34). Entre las  complicaciones del triflusal se ha informado que tiene efectos  fotoal&eacute;rgicos (39). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Mol&eacute;cula dual en estudio. NCX-4016 </b>(Nitro-aspirina) es un compuesto dual que consiste en una mol&eacute;cula de aspirina unida covalentemente con -ONO<sub>2</sub>.  Su f&oacute;rmula qu&iacute;mica es 2-(acetiloxi) &aacute;cido benzoico  3-[(nitrooxi)metil]fenil ester. Corresponde a una mol&eacute;cula de aspirina  capaz de donar &oacute;xido n&iacute;trico (NO) (40). Entre sus ventajas se incluyen  la combinaci&oacute;n de todos los beneficios asociados a la administraci&oacute;n de  aspirina con las propiedades cardioprotectoras del NO (antitromb&oacute;ticas,  antiaterog&eacute;nicas y vasodilatadoras) (41). Estudios en animales de  experimentaci&oacute;n han mostrado que NCX-4016 previene la reestenosis (42). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Inhibidor de fosfodiesterasa </i></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Dipiridamol. </b>Este  medicamento (<a href="#fig03">V&eacute;ase figura 3</a>) inhibe la enzima fosfodiesterasa que  inactiva al cAMP, aumentando as&iacute; la concentraci&oacute;n intracitoplasm&aacute;tica  de este &uacute;ltimo (<a href="#fig02">V&eacute;ase figura 2</a>). El incremento intraplaquetario de cAMP  reduce la activaci&oacute;n de segundos mensajeros citoplasm&aacute;ticos. El  dipiridamol tambi&eacute;n estimula la liberaci&oacute;n de prostaciclina e inhibe la  formaci&oacute;n de TXA<sub>2</sub> (16, 18, 20). La cefalea es el efecto secundario m&aacute;s com&uacute;n asociado al tratamiento con dipiridamol (25, 43). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Cilostazol. </b>Esta  mol&eacute;cula (<a href="#fig03">V&eacute;ase figura 3</a>) es un inhibidor oral selectivo de nucle&oacute;tidos  c&iacute;clicos de la fosfodiesterasa 3 (PDE3) (<a href="#fig02">V&eacute;ase figura 2</a>), con efectos  antiplaquetario, vasodilatador y antimitog&eacute;nico (44-47). Cilostazol  inhibe selectivamente la isoenzima PDE3 y a PDE3A (subtipo  cardiovascular), a trav&eacute;s de un mecanismo cAMP competitivo (48). La  inhibici&oacute;n de la funci&oacute;n plaquetaria por cilostazol parece obedecer a  la disminuci&oacute;n de los niveles de calcio intracelular, resultantes del  incremento de los niveles de cAMP (45, 48); adem&aacute;s se sugiere que el  cilostazol inhibe la agregaci&oacute;n plaquetaria suprimiendo la activaci&oacute;n  de la GPIIb-IIIa (49). Seg&uacute;n lo reportado en el estudio CSPS <i>(Cilostazol Stroke Prevention Study) </i>los  efectos adversos con este f&aacute;rmaco son infrecuentes, e incluyen cefalea,  palpitaciones y diarrea, y est&aacute; contraindicado en pacientes con falla  card&iacute;aca congestiva, (50, 51). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Inhibidores de receptores plaquetarios </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Inhibidores de receptores de ADP </i></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Las  tienopiridinas (ticlopidina, clopidogrel y prasugrel) son prof&aacute;rmacos  que una vez metabolizados se transforman en f&aacute;rmacos activos y como  tales inhiben los receptores de ADP (P2Y<sub>1</sub>, P2Y<sub>12</sub>) (<a href="#fig02">V&eacute;ase figura 2</a>). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Ticlopidina. </b>Este  f&aacute;rmaco (<a href="#fig04">V&eacute;ase figura 4</a>) representa una alternativa a la aspirina en  aquellos pacientes con resistencia a esta &uacute;ltima (15, 16, 18). La  ticlopidina fue el primer agente antiplaquetario de la familia de las  tienopiridinas que se us&oacute;. Dos importantes ensayos cl&iacute;nicos, CATS (<i>Canadian American Ticlopidine Study</i>) (52) y TASS (<i>Aspirin Stroke Study</i>)  (53), demostraron la eficacia de la ticlopidina en la reducci&oacute;n de  eventos tromb&oacute;ticos en pacientes con enfermedad ateroscler&oacute;tica. Sin  embargo, presenta un inicio tard&iacute;o de su efecto, lo cual ha limitado su  uso en SCA. Su efecto adverso m&aacute;s importante es la neutropenia marcada,  la que generalmente desaparece una vez suspendido el medicamento (25,  54). Adem&aacute;s, con baja frecuencia la ticlopidina ha sido asociada a  trombocitopenia grave pero reversible, anemia apl&aacute;sica,  hipercolesterolemia y p&uacute;rpura tromb&oacute;tico trombocitop&eacute;nica (PTT) (20,  25, 43). </font></p>     <p>&nbsp;</p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="fig04" id="fig04"></a><a href="/img/revistas/vitae/v16n1/a16fig04.gif"><img src="/img/revistas/vitae/v16n1/a16fig04th.gif" border="2" /></a></font></p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Figura 4. Estructura de inhibidores de receptores plaquetarios. </b>De P2Y<sub>1</sub>, P2Y<sub>12</sub> (Ticlopidina, Clopidogrel y Prasugrel) y de GPIIb-IIIa (Eptifibatide, Tirofiban). Adaptado de referencias 34 y 73. </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Clopidogrel. </b>Este  medicamento (<a href="#fig04">V&eacute;ase figura 4</a>) est&aacute; relacionado qu&iacute;mica y  farmacol&oacute;gicamente con la ticlopidina, pero presenta un perfil de  efectos secundarios m&aacute;s favorable (15-17, 55), motivo por el que la ha  reemplazado. En el estudio CAPRIE (<i>Clopidogrel Versus Aspirin in Patients at Risk of Ischemic Events</i>),  la presentaci&oacute;n de rash marcado fue m&aacute;s frecuente con clopidogrel que  con aspirina (0.26% vs 0.1%) (56). Bas&aacute;ndose en la agregaci&oacute;n  plaquetaria inducida por ADP, algunos pacientes han sido considerados  &ldquo;no respondedores o resistentes&rdquo; al clopidogrel (25). Incluso se ha  identificado un n&uacute;mero no despreciable de estos pacientes que presentan  un incremento en la incidencia de trombosis subaguda tras la  implantaci&oacute;n de un <i>stent </i>(57). Se ha sugerido que el  tratamiento concurrente de estatinas que son sustratos del citocromo  P450 3A4 (CYP3A4) (ej, atorvastatina y simvastatina), puede interferir  con el efecto antiagregante del clopidogrel modificando su  biodisponibilidad sist&eacute;mica y su eficacia cl&iacute;nica (25). Finalmente,  adem&aacute;s de sus propiedades antiagregantes, se ha demostrado que  clopidogrel reduce la formaci&oacute;n de conjugados trombocito-leucocito en  pacientes con SCA (58) y reduce la expresi&oacute;n de marcadores  inflamatorios en plaquetas activadas como CD40L y P-selectina en  pacientes sometidos a intervenci&oacute;n coronaria percut&aacute;nea (59). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Prasugrel </b>(CS-747,  LY640315). Este f&aacute;rmaco (<a href="#fig04">V&eacute;ase figura 4</a>), tambi&eacute;n es un prof&aacute;rmaco de  tipo tienopiridina (60, 61); es activo por v&iacute;a oral (62) y posee un  espectro de actividades biol&oacute;gicas similares a las que presenta  clopidogrel (62). La estructura qu&iacute;mica de prasugrel le permite una  eficiente conversi&oacute;n a su metabolito activo con dependencia menos  rigurosa de las enzimas espec&iacute;ficas de la v&iacute;a del citocromo P-450 a  nivel hep&aacute;tico, donde es metabolizado (33), ya que <i>in vivo </i>se convierte r&aacute;pidamente a un metabolito activo (R-138727) que se une espec&iacute;ficamente y de forma irreversible al receptor P2Y<sub>12</sub> (60).  Estas ventajas farmacol&oacute;gicas probablemente se explican por una mejor  farmacocin&eacute;tica, es decir, una m&aacute;s alta tasa de conversi&oacute;n del  prof&aacute;rmaco en el metabolito activo (62). Debido a que las  tienopiridinas no inhiben el metabolismo del &aacute;cido araquid&oacute;nico,  permite una interacci&oacute;n sin&eacute;rgica con la aspirina (60, 63-65). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Antagonistas de P2Y<sub>12</sub> en estudio. </b>Algunos compuestos antiplaquetarios que inhiben en forma reversible P2Y<sub>12</sub> y que se encuentran en estudios de fase I-III, son los siguientes: (a) <b>AZD6140 </b>(AstraZeneca) es un an&aacute;logo de ATP que no requiere conversi&oacute;n a un metabolito activo y act&uacute;a como antagonista directo de P2Y<sub>12</sub>, (33, 66, 67), (b) <b>Cangrelor </b>(AR-C69931MX) (68, 69) y (c) <b>PRT060128 </b>(Portola) (70). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Inhibidores de GPIIb-IIIa </i></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Varios  antiagregantes actu&aacute;n como bloqueadores de la GPIIb-IIIa, algunos de  uso parenteral: Eptifibatide, Tirofiban y Abciximab (<a href="#fig02">V&eacute;ase figura 2</a>). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Eptifibatide. </b>Este  f&aacute;rmaco es un p&eacute;ptido c&iacute;clico (<a href="#fig04">V&eacute;ase figura 4</a>) que se une  reversiblemente al complejo GPIIb-IIIa (20). Tanto en el estudio  PURSUIT <i>(Platelet Glycoprotein IIb/IIIa in Unstable Angina: Receptor Suppression Using Integrilin Therapy</i>), como en el ESPRIT (<i>Enhanced Supresi&oacute;n of the Platelet IIb-IIIa Receptor with Integrilin Therapy</i>),  pacientes tratados con eptifibatide, mostraron un incremento en las  complicaciones hemorr&aacute;gicas (71, 72) en algunos casos asociada a  trombocitopenia, posiblemente inmunomediada (25). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tirofiban.  Este medicamento corresponde a una mol&eacute;cula peque&ntilde;a no pept&iacute;dica (<a href="#fig04">V&eacute;ase  figura 4</a>) que tambi&eacute;n se une reversiblemente al complejo GPIIb-IIIa  (20). En un peque&ntilde;o porcentaje de pacientes se ha reportado  trombocitopenia marcada, probablemente de tipo inmune (18, 25, 43). En  los pacientes con insuficiencia renal, el <i>clearance </i>plasm&aacute;tico del tirofiban se encuentra disminuido y la vida media plasm&aacute;tica aumentada (72). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Abciximab. </b>Este  f&aacute;rmaco es un anticuerpo monoclonal con especificidad anti-GPIIb-IIIa  (17, 20). Su principal complicaci&oacute;n es la presentaci&oacute;n de eventos  hemorr&aacute;gicos (73). En el proyecto GUSTO IV ACS (<i>Global Utilization of Streptokinase and Tissue Plasminogen Activator for Occluded Coronary Arteries</i>),  abciximab respecto a placebo se asoci&oacute; con un incremento de eventos  hemorr&aacute;gicos (73). Aproximadamente el 1-2% de los pacientes tratados  con abciximab desarrolla trombocitopenia, al parecer inmunomediada y  reversible si se suspende la administraci&oacute;n del f&aacute;rmaco (25). Entre los  efectos secundarios de este f&aacute;rmaco, adem&aacute;s del riesgo hemorr&aacute;gico por  el gran efecto inhibidor de la agregaci&oacute;n plaquetaria, destaca su  capacidad inmunog&eacute;nica, a pesar de ser inferior que la descrita con los  anticuerpos murinos, y la trombocitopenia (1,6-5%) (74). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Otros anti-GPIIb-IIIa. </b>Varios  f&aacute;rmacos antagonistas de la GPIIb-IIIa activos por v&iacute;a oral han sido  descritos: Xemilofiban, Sibrafiban, Orbofiban y Lotrafiban. Sin  embargo, los resultados cl&iacute;nicos no han sido alentadores (75). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Antagonistas de receptores PAR </i></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>E5555 y SCH530348</b>.  Los receptores PAR1 y PAR4 de las plaquetas pueden unir trombina (<a href="#fig02">V&eacute;ase  figura 2</a>) (76), serino proteasa que produce liberaci&oacute;n del segmento  aminoterminal de los receptores PAR y genera nuevas secuencias  aminoac&iacute;dicas terminales, SFLLRN para PAR1 y GYPGKF para PAR4; &eacute;stas  autoactivan otras regiones de los receptores PAR e inician la  activaci&oacute;n plaquetaria v&iacute;a prote&iacute;nas G (77). Se han evaluado en  estudios cl&iacute;nicos dos antagonistas orales de PAR1: E5555 y SCH530348.  La eficacia y la seguridad de E5555 est&aacute;n siendo evaluadas en pacientes  con enfermedad arterial coronaria (41). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Pepducinas</b>.  Son p&eacute;ptidos basados en la secuencia intracelular de los PAR que  interacciona con las prote&iacute;nas G acopladas. Act&uacute;an intracelularmente  bloqueando la interacci&oacute;n entre las prote&iacute;nas G y los PAR. Se ha  observado que P1 pal-12 inhibe la activaci&oacute;n plaquetaria mediada por  PAR1 (78) y P4 pal10 inhibe la activaci&oacute;n mediada por PAR4 (79, 80). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Aprotinina</b>.  Si bien este medicamento no es un inhibidor de PAR, indirectamente est&aacute;  relacionado con PAR-1 al inhibir serino proteasas (ej. trombina) y as&iacute;  afectar la funci&oacute;n plaquetaria. La aprotinina es usada durante las  cirug&iacute;as card&iacute;acas (81-83). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Inhibidor del receptor de tromboxano </i></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>S18886</b>. Esta mol&eacute;cula es un inhibidor reversible del receptor del tromboxano (TXA<sub>2</sub>R) (84) y por ello no s&oacute;lo inhibe la acci&oacute;n del TXA<sub>2</sub>, sino tambi&eacute;n la activaci&oacute;n del TXA<sub>2</sub>R  derivada de otros eicosanoides no inhibidos por la aspirina (HETE e  isoprostanos) (85). Se ha demostrado la r&aacute;pida y eficaz actividad de  S18886 en inhibir la trombosis inducida por <i>stent </i>sin la  concomitante aparici&oacute;n de un mayor riesgo de sangrado (86). Tambi&eacute;n se  ha demostrado que S18886 previene la aterog&eacute;nesis, causa regresi&oacute;n de  la placa ateroscler&oacute;tica y mejora la funci&oacute;n endotelial en pacientes  con enfermedad arterial coronaria, propiedades relativamente  independientes de los efectos derivados del TXA<sub>2</sub> en las plaquetas (87, 88). </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ANTIPLAQUETARIOS DESDE UNA PERSPECTIVA CL&Iacute;NICA </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A continuaci&oacute;n se comentan algunos aspectos sobre los antiagregantes plaquetarios en uso, desde un punto de vista cl&iacute;nico. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Aspirina. </b>Administrada  una vez al d&iacute;a, est&aacute; recomendada en todas las condiciones cl&iacute;nicas en  las que la profilaxis antiplaquetaria tiene un perfil beneficio/riesgo  favorable. La evidencia disponible apoya el uso de dosis diarias de  aspirina en el rango de 75-100 mg para la prevenci&oacute;n a largo plazo de  episodios vasculares graves en pacientes de alto riesgo (es decir, de  un 3% o m&aacute;s por a&ntilde;o). En las situaciones cl&iacute;nicas en que se requiera un  efecto antitromb&oacute;tico inmediato, como en los SCA o en los accidentes  cerebrovasculares isqu&eacute;micos agudos, debe administrarse una dosis  inicial de 160-300 mg en el momento del diagn&oacute;stico para asegurar una  inhibici&oacute;n completa y r&aacute;pida de la agregaci&oacute;n plaquetaria dependiente  del TXA<sub>2</sub> (89). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Ticlopidina. </b>El  papel de la ticlopidina en el repertorio terap&eacute;utico actual es  incierto. Aunque no hay comparaciones directas suficientemente grandes  entre las dos tienopiridinas, las comparaciones indirectas sugieren que  el clopidogrel se asocia a una menor carga de toxicidad grave de la  m&eacute;dula &oacute;sea. Adem&aacute;s, a diferencia del clopidogrel, la ticlopidina no  tiene una indicaci&oacute;n aprobada para el caso de pacientes con IAM  reciente (43, 90). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Clopidogrel. </b>El  clopidogrel, a una dosis diaria de 75 mg, es una alternativa adecuada  en pacientes de alto riesgo con enfermedad coronaria, enfermedad  cerebrovascular o enfermedad arterial perif&eacute;rica que tengan alguna  contraindicaci&oacute;n para tomar aspirina a bajas dosis. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los resultados del estudio cl&iacute;nico CURE (<i>Clopidogrel in Instable Angina to Prevent Recurrente Events</i>)  han llevado a la aprobaci&oacute;n de una nueva indicaci&oacute;n para el clopidogrel  en pacientes con un SCA sin elevaci&oacute;n del segmento ST. En este contexto  cl&iacute;nico, se recomienda usar una dosis inicial de clopidogrel de 300 mg,  seguida de una dosis diaria de 75 mg. La revisi&oacute;n de las gu&iacute;as de  pr&aacute;ctica cl&iacute;nica existentes requerir&aacute; un acuerdo por consenso por parte  de los expertos respecto al momento de realizar la intervenci&oacute;n  coronaria percut&aacute;nea, la duraci&oacute;n del tratamiento con clopidogrel y la  combinaci&oacute;n con antagonistas de los receptores de la GPIIb/IIIa (91). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Abciximab, Eptifibatide y Tirofiban. </b>El  perfil beneficio/riesgo de estos f&aacute;rmacos es muy incierto para aquellos  pacientes que cursan con un SCA, que no han sido programados  rutinariamente para recibir una revascularizaci&oacute;n temprana (73). Por el  contrario, en el caso de pacientes que se sometan a una intervenci&oacute;n  coronaria percut&aacute;nea, la intensificaci&oacute;n de la terapia antiplaquetaria  a&ntilde;adiendo un antagonista de los receptores de la GPIIb/IIIa por v&iacute;a  intravenosa es una estrategia adecuada para reducir el riesgo de las  complicaciones tromb&oacute;ticas asociadas al procedimiento (92-94). </font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>COMENTARIO FINAL </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los  antiagregantes en uso han sido &uacute;tiles en la prevenci&oacute;n de eventos  cardiovasculares primarios en la poblaci&oacute;n de alto riesgo y eventos  secundarios en individuos que ya han presentado uno </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">o  m&aacute;s eventos cardiovasculares tromb&oacute;ticos. Sin embargo, presentan  algunos efectos adversos, entre otros hemorragia, hipersensibilidad y  trastornos gastrointestinales, y adem&aacute;s alg&uacute;n grado de resistencia a su  efecto. Dada la frecuencia con las que las ECV se presentan en el mundo  desarrollado y en desarrollo, es necesaria la b&uacute;squeda de nuevos  antiplaquetarios, los que podr&aacute;n tener como blanco prote&iacute;nas sobre las  que ya otros antiplaquetarios actuan y otras prote&iacute;nas que a&uacute;n no son <i>targets </i>de  este tipo de f&aacute;rmacos. Entre los blancos seguramente estar&aacute;n enzimas y  prote&iacute;nas citoplasm&aacute;ticas, como tambi&eacute;n glicoprote&iacute;nas plaquetarias  espec&iacute;ficas y otros receptores de membrana. Los nuevos antiplaquetarios  deben ser m&aacute;s efectivos a menos dosis para disminuir la toxicidad.  Respecto a la aspirina un par de comentarios finales: (a) a pesar de  sus beneficios a&uacute;n existe un importante grupo de paciente que no la  reciben; al respecto alguien dijo &ldquo;en prevenci&oacute;n secundaria  cardiovascular, se deber&iacute;a justificar por qu&eacute; no dar aspirina en vez de  pensar si el paciente la necesita o no&rdquo; y (b) a pesar de sus efectos  adversos y resistencia descrita, considerando sus ventajas y bajo costo  comparado con otros antiagregantes plaquetarios, seguramente pasar&aacute;  mucho tiempo antes que otro f&aacute;rmaco la pueda reeemplazar. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>REFERENCIAS BIBLIOGR&Aacute;FICAS </b></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1. Tendera  M, Wojakowski W. Role of antiplatelet drugs in the prevention of  cardiovascular events. 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<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recibido: Junio 22 de 2008.<br /> Aceptado: Noviembre 4 de 2008.</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a href="#ast02">*</a><a name="ast01" id="ast01"></a> Autor a quien debe dirigir la correspondencia: <a href="mailto:ipalomo@utalca.cl">ipalomo@utalca.cl</a></font></p>      ]]></body><back>
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