<?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>1688-0420</journal-id>
<journal-title><![CDATA[Revista Uruguaya de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Urug.Cardiol.]]></abbrev-journal-title>
<issn>1688-0420</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Uruguaya de Cardiología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-04202013000300018</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Angioplastia primaria en el infarto agudo de miocardio]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Batista]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso]]></surname>
<given-names><![CDATA[Santiago]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mayol]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,UDELAR Hospital de Clínicas Departamento de Cardiología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Sanatorio Americano Centro Cardiológico Americano ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Sanatorio Americano Centro Cardiológico Americano Servicio de Hemodinamia e Intervencionismo Cardiovascular]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>28</volume>
<numero>3</numero>
<fpage>437</fpage>
<lpage>451</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-04202013000300018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-04202013000300018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-04202013000300018&amp;lng=en&amp;nrm=iso"></self-uri><kwd-group>
<kwd lng="es"><![CDATA[INFARTO DEL MIOCARDIO-terapia]]></kwd>
<kwd lng="es"><![CDATA[ANGIOPLASTIA-métodos]]></kwd>
<kwd lng="es"><![CDATA[ANGIOPLASTIA-efectos adversos]]></kwd>
<kwd lng="es"><![CDATA[REPERFUSIóN MIOCáRDICA]]></kwd>
<kwd lng="es"><![CDATA[MYOCARDIAL INFARCTION-therapy]]></kwd>
<kwd lng="es"><![CDATA[ANGIOPLASTY-methods]]></kwd>
<kwd lng="es"><![CDATA[ANGIOPLASTY-adverse effects]]></kwd>
<kwd lng="es"><![CDATA[MYOCARDIAL REPERFUSION]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <basefont size="3"> <multicol gutter="18" cols="2"></multicol>     <p align="left"><font face="Verdana" size="2"><b>Art&iacute;culo de revisi&oacute;n&nbsp;</b></font></p>     <p align="left"><b><font face="Verdana" size="4"> Angioplastia primaria en el infarto agudo de miocardio&nbsp; </font></b></p>     <p align="left"><font face="Verdana" size="2"> Dres. Ignacio Batista</font><font color="#d62437" face="Candara" size="4"><a href="#1a"><font face="Verdana"  size="2"><sup>1</sup></font></a></font><font face="Verdana"  size="2">, Santiago Alonso</font><font color="#d62437" face="Candara" size="4"><a href="#2a"><font  face="Verdana" size="2"><sup>2</sup></font></a></font><font  face="Verdana" size="2">, Jorge Mayol</font><font color="#d62437" face="Candara" size="4"><a href="#3a"><font face="Verdana" size="2"><sup>3</sup></font></a></font><font face="Verdana" size="2">&nbsp; </font> <font face="Verdana"><font size="2">    <br> </font> <basefont size="3"> </font> </p>     <p align="left"><font face="Verdana" size="2"><a  name="1a"></a> 1. Cardi&oacute;logo Intervencionista del Centro Cardiol&oacute;gico Americano - Sanatorio Americano. Asistente del Departamento de Cardiolog&iacute;a. Hospital de Cl&iacute;nicas. UDELAR.    <br> <a name="2a"></a> 2. Cardi&oacute;logo Intervencionista del Centro Cardiol&oacute;gico Americano - Sanatorio Americano.    <br> <a name="3a"></a> 3. Cardi&oacute;logo Intervencionista, Co-Director del Servicio de Hemodinamia del Centro Cardiol&oacute;gico Americano. Sanatorio Americano.    <br> Correspondencia: Dr. Jorge Mayol. Servicio de Hemodinamia e Intervencionismo Cardiovascular del Centro Cardiol&oacute;gico Americano. Sanatorio Americano. Isabelino Bosch 2466, Montevideo 11600, Uruguay.    <br> Correo electr&oacute;nico: mayol.jorge@gmail.com&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="left"> <font face="Verdana" size="2"><b>Palabras clave:</b>    <br> &nbsp;&nbsp;&nbsp;&nbsp;INFARTO DEL MIOCARDIO-terapia    <br> &nbsp;&nbsp;&nbsp;&nbsp;ANGIOPLASTIA-m&eacute;todos    <br> &nbsp;&nbsp;&nbsp;&nbsp;ANGIOPLASTIA-efectos adversos    <br> &nbsp;&nbsp;&nbsp;&nbsp;REPERFUSI&oacute;N MIOC&aacute;RDICA&nbsp;</font></p>     <p align="left"> <font face="Verdana" size="2"><b>Key words:</b>    <br> &nbsp;&nbsp; MYOCARDIAL INFARCTION-therapy    <br> &nbsp;&nbsp;&nbsp;&nbsp;ANGIOPLASTY-methods    <br> &nbsp;&nbsp;&nbsp;&nbsp;ANGIOPLASTY-adverse effects    <br> &nbsp;&nbsp;&nbsp; MYOCARDIAL REPERFUSION&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"><b>Introducci&oacute;n&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Las primeras experiencias sobre reperfusi&oacute;n en el infarto agudo de miocardio (IAM) en Uruguay datan del a&ntilde;o 1983, con el uso de fibrinol&iacute;ticos (FBL) sist&eacute;micos</font><sup><font face="Verdana" size="2"> <a name="1."></a>(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#1">1</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2">. Poco despu&eacute;s, el Dr. Fausto Buitr&oacute;n introdujo la angioplastia coronaria (ATC) y desde el inicio abord&oacute; a pacientes con IAM <a name="2."></a></font><sup> <font face="Verdana" size="2"> (</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#2">2</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2">. Sin embargo, reci&eacute;n en el a&ntilde;o 2006 se public&oacute; una experiencia de alcance nacional con ATC en el IAM, con la aparici&oacute;n del <b>Re</b>gistro <b>Na</b>cional del <b>T</b>ratamiento <b>I</b>ntervencionista del Infarto <b>A</b>gudo de Miocardio en Uruguay (RENATIA), impulsado por el Comit&eacute; de Hemodinamia de la Sociedad Uruguaya de Cardiolog&iacute;a</font><sup><font face="Verdana" size="2"><a name="3."></a>(</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#3">3</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#4">4</a></font><font face="Verdana" size="2"><a  name="4."></a>)</font></sup><font face="Verdana"  size="2">. Este registro, presentado por primera vez en el Congreso Uruguayo de Cardiolog&iacute;a del a&ntilde;o 2003, fue un estudio observacional, multic&eacute;ntrico y prospectivo, que cont&oacute; con la participaci&oacute;n de todos los centros de cardiolog&iacute;a intervencionista del pa&iacute;s, con el objetivo de valorar los resultados de la ATC primaria (ATC1&ordf;) en Uruguay. Se ingresaron 306 pacientes cursando un IAM de &lt; 12 horas, tratados con ATC1&ordf; entre abril de 2001 y octubre de 2002, con seguimiento telef&oacute;nico al a&ntilde;o. El 50% de los mismos fueron pacientes derivados de hospitales sin capacidad para hemodinamia. Se comprob&oacute; una baja mortalidad intrahospitalaria (5%), a los 30 d&iacute;as (7%), y a los 6 meses (12%) en el global de pacientes, al igual que una tasa de eventos adversos similares a la de registros internacionales. Los resultados demostraron la factibilidad y seguridad de la ATC1&ordf; en Uruguay, pero el n&uacute;mero de pacientes que acced&iacute;an a esta estrategia de reperfusi&oacute;n estaba por debajo de lo esperado.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Desde la descripci&oacute;n de la primera ATC en el IAM por el Dr. Geofrey Harzler, ya han transcurrido 30 a&ntilde;os</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#5">5</a></font><font face="Verdana" size="2"><a name="5."></a>)</font></sup><font face="Verdana" size="2"> y desde la elaboraci&oacute;n de RENATIA m&aacute;s de 10, por lo que resulta oportuno actualizar la evidencia cient&iacute;fica sobre esta terap&eacute;utica, sus indicaciones y resultados en los diferentes escenarios cl&iacute;nicos.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> En el presente trabajo abordamos estos temas, quedando para una segunda entrega el an&aacute;lisis de la casu&iacute;stica de la ATC1&ordf; en nuestro pa&iacute;s en los &uacute;ltimos nueve a&ntilde;os.&nbsp; </font><font face="Verdana"><font size="2">    <br> </font> <basefont size="3"> </font> </p> <font face="Verdana" size="2">     <br> </font>     <p align="left"><font face="Verdana" size="2"> <b>I. Las opciones de reperfusi&oacute;n en el IAM&nbsp;</b> </font></p>     <p><font face="Verdana" size="2"> El tratamiento de reperfusi&oacute;n coronaria tiene por objetivo la restauraci&oacute;n del flujo coronario normal en la arteria responsable del infarto agudo de miocardio con elevaci&oacute;n del ST (IAMcST). Esto puede alcanzarse mediante la intervenci&oacute;n coronaria percut&aacute;nea primaria o ATC1&ordf; </font><sup> <font face="Verdana" size="2"> (</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#6">6</a></font><font face="Verdana" size="2"><a name="6."></a>)</font></sup><font face="Verdana" size="2"> o la terapia fibrinol&iacute;tica y ambas estrategias mejoran los resultados cl&iacute;nicos en casi todos los grupos de pacientes. Respecto a los FBL, se ha demostrado que fallan en restablecer la permeabilidad de la arteria coronaria involucrada en un 20% a 45% de los casos, seg&uacute;n el f&aacute;rmaco utilizado</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#7">7</a></font><font face="Verdana" size="2"><a name="7."></a>)</font></sup><font face="Verdana" size="2"><b>.</b> Por otra parte, luego de una fibrin&oacute;lisis exitosa, la reoclusi&oacute;n coronaria suele ocurrir precozmente en 5% a 10% de los pacientes y en forma tard&iacute;a en 30% de los casos</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#8">8</a></font><font face="Verdana" size="2"><a name="8."></a>,</font><font color="#1f1a17"  face="Verdana" size="2"><a  href="#9">9</a></font><font face="Verdana" size="2"><a name="9."></a>)</font></sup><font  face="Verdana" size="2"><b>.</b>&nbsp;&nbsp;</font></p> <multicol gutter="18" cols="2"></multicol>     <p align="left"><font face="Verdana" size="2">Por su lado, la ATC1&ordf; obtiene tasas de &eacute;xito en la reperfusi&oacute;n significativamente m&aacute;s elevadas que los FBL, dado que alcanza a restablecer un flujo coronario normal (flujo TIMI grado 3) en m&aacute;s de 90% de los pacientes, compar&aacute;ndose a 50%-60% que se logra a los 60-90 minutos de administrados los FBL</font><sup><font face="Verdana" size="2"><a name="10."></a>(</font><font  color="#1f1a17" face="Verdana" size="2"><a  href="#10">10</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">. Los estudios cl&iacute;nicos con la terapia fibrinol&iacute;tica han demostrado que los beneficios de la reperfusi&oacute;n, como la mejor&iacute;a en la sobrevida y en la funci&oacute;n ventricular izquierda, tienen buena correlaci&oacute;n con la restauraci&oacute;n de un flujo coronario epic&aacute;rdico normal (TIMI 3), pero no as&iacute; con grados de flujo inferiores (TIMI 0, 1 y 2)</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#11">11</a></font><font face="Verdana" size="2"><a name="11."></a><a  name="12."></a><a name="13."></a>-</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#14">14</a></font><font face="Verdana" size="2"><a name="14."></a>)</font></sup><font face="Verdana" size="2"><b>.</b>&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> La comparaci&oacute;n entre ambas estrategias en escenarios cl&iacute;nicos semejantes, permite concluir que la ventaja de la estrategia de ATC1&ordf; est&aacute; dada por una reducci&oacute;n relativa de la mortalidad de 30% a los 30 d&iacute;as (5,3% frente a 7,4%; OR 0,70; IC95%, 0,58-0,84)<sup>(</sup></font><sup><font color="#1f1a17"  face="Verdana" size="2"><a href="#15">15</a></font><font face="Verdana" size="2"><a name="15."></a>)</font></sup><font face="Verdana" size="2"><b>.</b> Cuando se la compara con los fibrinol&iacute;ticos fibrinoespec&iacute;ficos, como el alteplase acelerado, la ATC1&ordf; tambi&eacute;n tiene ventaja dado que logra una reducci&oacute;n relativa de la mortalidad de 19% (5,5% frente a 6,8%; OR 0,81; IC95%, 0,64-1,0)</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#16">16</a></font><font face="Verdana" size="2"><a name="16."></a>)</font></sup><font face="Verdana" size="2">, sin incremento del riesgo de sangrado cerebral</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#17">17</a></font><font face="Verdana" size="2"><a name="17."></a>)</font></sup><font face="Verdana" size="2"><b>.</b>&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> Por lo tanto, la ATC1&ordf; es la terapia de reperfusi&oacute;n de elecci&oacute;n en la mayor&iacute;a de los pacientes con IAMcST durante las 12 primeras horas de iniciados los s&iacute;ntomas, incluyendo al infarto con nuevo o presumiblemente nuevo bloqueo completo de rama izquierda o el infarto posterior. As&iacute; lo recomiendan las recientes gu&iacute;as de pr&aacute;ctica cl&iacute;nica del Colegio Americano de Cardiolog&iacute;a / Asociaci&oacute;n Americana del Coraz&oacute;n &nbsp;del 2013 y las de la Sociedad Europea de Cardiolog&iacute;a del 2012</font><sup><font face="Verdana" size="2">(<a name="18."></a></font><font color="#1f1a17"  face="Verdana" size="2"><a href="#18">18</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17"  face="Verdana" size="2"><a  href="#19">19</a></font><font face="Verdana" size="2"><a name="19."></a>)</font></sup><font  face="Verdana" size="2"><b>.</b>&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Sin embargo, dado que no todos las hospitales tienen la capacidad de realizar oportunamente una ATC1&ordf;, en muchos pacientes es necesario tomar la decisi&oacute;n entre la administraci&oacute;n de un fibrinol&iacute;tico localmente o trasladarlo para una intervenci&oacute;n percut&aacute;nea primaria. Como el beneficio de la reperfusi&oacute;n, ya sea con ATC1&ordf; o FBL, desciende r&aacute;pidamente con el tiempo, la decisi&oacute;n por una de estas estrategias debe tomarse lo antes posible</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#8">8</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><b>.</b> Sobre la base de datos de ensayos aleatorizados, la ATC1&ordf; se prefiere si se realiza de manera oportuna y por un operador experto</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#8">8</a></font><font face="Verdana" size="2">-</font><font  color="#1f1a17" face="Verdana" size="2"><a  href="#11">11</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><b>.</b> Sin embargo, la elecci&oacute;n es m&aacute;s dif&iacute;cil cuando la intervenci&oacute;n percut&aacute;nea implica un traslado a otro hospital, principalmente cuando la consulta es dentro de las tres primeras horas del inicio de los s&iacute;ntomas (v&eacute;ase el algoritmo de la </font><font color="#1f1a17" face="Verdana" size="2"> <a href="/img/revistas/ruc/v28n3/3a18f6.JPG">figura 6</a></font><font  face="Verdana" size="2">).&nbsp; </font><font size="2" face="Verdana">    <br> </font><font size="2"> </p> </font><font size="2" face="Verdana">     <br> </font>     <p align="left"><font face="Verdana" size="2"> <b>II. Definiendo una estrategia de reperfusi&oacute;n&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Cuando se encuentra disponible en tiempos adecuados y cumpliendo con los est&aacute;ndares de calidad, la ATC1&ordf; es la estrategia de reperfusi&oacute;n preferida para la mayor&iacute;a de los pacientes con IAMcST. El procedimiento debe realizarse con rapidez, en un tiempo puerta-bal&oacute;n de menos de 90 minutos.<b>&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Como tambi&eacute;n hay circunstancias en que la reperfusi&oacute;n con terapia fibrinol&iacute;tica es considerada una alternativa razonable, analizaremos los factores a tener en cuenta para una correcta toma de decisiones</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#13">13</a></font><font face="Verdana" size="2">-</font><font color="#1f1a17" face="Verdana" size="2"><a href="#15">15</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><b>.</b>&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>1. Demora vinculada con la ATC1&ordf;&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Los resultados alcanzados mediante ambos tratamientos (FBL y ATC1&ordf;) empeoran en la medida que aumenta la demora en su inicio. Del mismo modo, el retraso para el inicio de la ATC1&ordf; reduce el beneficio relativo de esta frente a los FBL. La siguiente terminolog&iacute;a se emplea para definir los tiempos de tratamiento.&nbsp; </font></p> <ul>       <li><font face="Verdana" size="2"> <b>Tiempo puerta-aguja: </b>es el tiempo entre la presentaci&oacute;n en el hospital o ambulancia (momento que se hace el diagn&oacute;stico de IAMcST) y la administraci&oacute;n del tratamiento fibrinol&iacute;tico.<b>&nbsp;</b> </font></li>       ]]></body>
<body><![CDATA[<li><font face="Verdana" size="2"> <b>Tiempo puerta-bal&oacute;n: </b>es el tiempo entre la presentaci&oacute;n en el hospital o ambulancia y el momento en insuflar el primer bal&oacute;n durante la ATC.&nbsp; </font></li>       <li><font face="Verdana" size="2"> <b>Retraso relacionado a la ATC1&ordf;: </b>es la diferencia entre el tiempo puerta-bal&oacute;n y el tiempo puerta-aguja. El retraso vinculado a la ATC1&ordf; sobreestima el retardo a la reperfusi&oacute;n, ya que la reperfusi&oacute;n por ATC es inmediata mientras que la terapia fibrinol&iacute;tica generalmente demora aproximadamente 30 minutos.&nbsp; </font></li>     </ul>     <p align="left"><font face="Verdana" size="2"> El impacto de la demora a la ATC1&ordf; en la supervivencia ha sido valorado tanto en ensayos aleatorizados como en estudios observacionales. En la revisi&oacute;n del a&ntilde;o 2003 de 23 ensayos aleatorizados de ATC1&ordf; versus FBL (7.739 pacientes), la magnitud del beneficio en la supervivencia disminuy&oacute; a medida que el tiempo relacionado a la ATC1&ordf; se increment&oacute;. Cuando el retraso a la ATC1&ordf; era mayor a 62 minutos, desaparec&iacute;a la ventaja sobre la FBL</font><sup><font face="Verdana" size="2">(<a name="20."></a></font><font color="#1f1a17" face="Verdana"  size="2"><a href="#20">20</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><b>.</b> En 13 ensayos que evaluaron el criterio de valoraci&oacute;n combinado (muerte, reinfarto o ictus) a las cuatro a seis semanas (4.946 pacientes) cada retardo adicional de 10 minutos en el tiempo puerta-bal&oacute;n, sobre el tiempo puerta-aguja, redujo el beneficio absoluto de la ATC1&ordf; en 1,17%. Las dos estrategias se hac&iacute;an equivalentes en relaci&oacute;n con el criterio de valoraci&oacute;n combinado cuando el retardo a ATC1&ordf; alcanzaba 93 minutos (</font><font color="#1f1a17" face="Verdana" size="2"><a href="#f1">figura 1</a></font><font face="Verdana" size="2">).<b>&nbsp;</b>&nbsp;</font></p>     <p><font size="2" face="Verdana">    <br> <a name="f1"></a><img style="width: 413px; height: 344px;" alt=""  src="/img/revistas/ruc/v28n3/3a18f1.JPG">    <br> &nbsp;(<a href="#20">20</a>)&nbsp; </font> </p>     <p align="left"><font face="Verdana" size="2">Sin embargo, en el mundo real las decisiones pueden ser mas dif&iacute;ciles, especialmente en centros asistenciales distantes a una sala de hemodinamia y carentes de programas de FBL, lo que obliga a traslados innecesarios para la reperfusi&oacute;n (tanto FBL como ATC1&ordf;) agregando demoras perjudiciales. Esto preocupa particularmente en ciudades peque&ntilde;as del interior del pa&iacute;s, donde se registran tiempos de consulta (dolor-puerta) m&aacute;s breves a los registrados en grandes ciudades, present&aacute;ndose una buena cantidad de pacientes en &ldquo;la hora de oro&rdquo;.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Estas dificultades tambi&eacute;n se observan en pa&iacute;ses como Estaos Unidos, donde el retraso relacionado a ATC1&ordf; es mayor al recomendado por las gu&iacute;as de pr&aacute;ctica cl&iacute;nica o los observados en los ensayos cl&iacute;nicos</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#20">20</a></font><font face="Verdana" size="2">-<a name="21."></a><a  name="22."></a></font><font color="#1f1a17"  face="Verdana" size="2"><a href="#23">23</a></font><font face="Verdana" size="2">)<a name="23."></a></font></sup><font face="Verdana" size="2"><b>.</b> En un registro publicado en 2011, el 68% los pacientes trasladados para ATC1&ordf; presentaron retrasos mayores a 90 minutos, con un tiempo medio puerta-bal&oacute;n de 161 minutos y un tiempo medio puerta-aguja de 35 minutos</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#23">23</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">. El an&aacute;lisis multivariado no encontr&oacute; ventaja alguna en mortalidad de la ATC1&ordf; sobre la fibrin&oacute;lisis cuando el retraso vinculado a ATC superaba los 120 minutos. Para los grupos de pacientes con retraso a ATC1&ordf; de &lt; 60 y de 60 a 90 minutos, la mortalidad hospitalaria favoreci&oacute; a la ATC1&ordf; (2,7 versus 7,4 y 3,6 versus 5,5%, respectivamente), mientras que las tasas fueron similares para el grupo de pacientes con retardo a ATC1&ordf; &gt; 90 minutos (5,7 versus 6,1%, respectivamente).&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>2. Factores vinculados al paciente&nbsp;</b> </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> A pesar de los esfuerzos por identificar un modelo temporal &uacute;nico que gu&iacute;e la selecci&oacute;n de la mejor estrategia de reperfusi&oacute;n, (por ejemplo: diferencia puerta/bal&oacute;n - puerta/aguja &gt; 60 minutos), hay estudios que muestran una gran variabilidad en la evoluci&oacute;n cl&iacute;nica de los pacientes seg&uacute;n algunas caracter&iacute;sticas que pueden modificar dicha selecci&oacute;n. Factores como la edad, la duraci&oacute;n de los s&iacute;ntomas o la topograf&iacute;a del IAM modulan el beneficio relativo de ambas estrategias</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#23">23</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> a)&nbsp;&nbsp;&nbsp;&nbsp;<i>Cuanto menor es la duraci&oacute;n de los s&iacute;ntomas, menos aceptables son las demoras en los traslados a ATC. </i>Como demostr&oacute; Boersma en 1996, el paso de las horas genera una mayor resistencia a la fibrin&oacute;lisis (</font><font color="#1f1a17" face="Verdana" size="2"><a href="#f2">figura 2</a></font><font face="Verdana" size="2">) reduci&eacute;ndose progresivamente el beneficio en sobrevida. Luego de las dos horas de inicio de los s&iacute;ntomas, el beneficio con el tratamiento FBL se reduce aproximadamente en 1,6 vidas por 1.000 pacientes tratados por hora. Luego de tres horas la recuperaci&oacute;n mioc&aacute;rdica y la reducci&oacute;n de la mortalidad son aun menos sensibles al tiempo. Por este motivo, los pacientes con m&aacute;s de tres horas de evoluci&oacute;n y con un retraso estimado mayor de 60 minutos podr&iacute;an ser tratados mediante una ATC1&ordf;.&nbsp;&nbsp;</font></p>     <p align="left"><font face="Verdana" size="2">    <br> <a name="f2"></a><img style="width: 406px; height: 307px;" alt=""  src="/img/revistas/ruc/v28n3/3a18f2.JPG">    <br> </font> </p>     <p><font size="2" face="Verdana">&nbsp;(<a href="#29">29</a>)    <br> </font> </p>     <p align="left"><font face="Verdana" size="2"> b)&nbsp;&nbsp;&nbsp;&nbsp;<i>Cuanto m&aacute;s j&oacute;venes son los pacientes, menos aceptable es la demora en el traslado a ATC1&ordf;. </i>El punto de &ldquo;equilibrio&rdquo; se produce a los 71 minutos de demora en los pacientes &lt;65 a&ntilde;os y a los 155 minutos en pacientes &sup3;65 a&ntilde;os (</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#f3">figura 3</a></font><font face="Verdana" size="2"> y </font> <font color="#1f1a17" face="Verdana" size="2"> <a href="#f4">figura 4</a></font><font face="Verdana" size="2">). Esto significa que con cualquier retraso relacionado a la ATC1&ordf; mayor que estos valores, la probabilidad de supervivencia ya no ser&iacute;a mejor que con los FBL. Esto puede ser consecuencia de que la fibrin&oacute;lisis tiene una mayor tasa de complicaciones en pacientes de edad avanzada.&nbsp;&nbsp;</font></p>     <p align="left"><font face="Verdana" size="2">    <br> <a name="f3"></a><img style="width: 409px; height: 347px;" alt=""  src="/img/revistas/ruc/v28n3/3a18f3.JPG">    ]]></body>
<body><![CDATA[<br> </font> </p>     <p><font size="2" face="Verdana">(<a href="#23">23</a>) </font></p>     <p align="left"><font face="Verdana" size="2">    <br> <a name="f4"></a><img style="width: 410px; height: 358px;" alt=""  src="/img/revistas/ruc/v28n3/3a18f4.JPG">    <br> </font> </p>     <p align="left"><font face="Verdana" size="2">&nbsp;(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#23">23</a></font><font face="Verdana" size="2">)</font></p>     <p align="left"><font face="Verdana" size="2">c)&nbsp;&nbsp;&nbsp;&nbsp;<i>Los infartos de topograf&iacute;a anterior pierden la ventaja de la ATC1&ordf; con retrasos m&aacute;s cortos que los pacientes con infartos no anteriores </i>(</font><font color="#1f1a17" face="Verdana" size="2"><a href="#f4">figura 4</a></font><font face="Verdana" size="2">).&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>3. Factores no vinculados al paciente&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Los factores no relacionados al paciente que parecen aumentar el retardo a la ATC1&ordf;, son los tiempos de transferencia puerta a puerta y la presentaci&oacute;n fuera de horarios normales de trabajo.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> En el NRMI (National Registry of Myocardial Infarction), la mediana del tiempo de transferencia de puerta a puerta fue de 120 minutos, en lugar de los 30 minutos observado en los ensayos aleatorizados</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#24">24</a></font><font face="Verdana" size="2"><a  name="24."></a>)</font></sup><font  face="Verdana" size="2"><b>.</b> Tambi&eacute;n se evalu&oacute; la relaci&oacute;n entre el momento de presentaci&oacute;n de un paciente y la demora al tratamiento en 68.439 pacientes tratados por IAMcST con FBL o ATC1&ordf; </font><sup> <font face="Verdana" size="2"> (</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#25">25</a></font><font face="Verdana" size="2"><a  name="25."></a>)</font></sup><font  face="Verdana" size="2">. Entre los pacientes que se presentan &ldquo;fuera de hora&rdquo; (d&iacute;as laborables entre 5 p.m. a 7 a.m. y fines de semana), hubo un aumento significativo en el tiempo a la ATC1&ordf; (puerta-bal&oacute;n de 116 versus 95 minutos). El tiempo al FBL no vari&oacute; (34 frente a 33 minutos). Los autores del estudio concluyen que los hospitales que proveen servicios de ATC1&ordf; (365d&iacute;as/7d&iacute;as/24horas) deben comprometerse a ofrecer en forma permanente una igual celeridad en el abordaje de estos pacientes.&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p> <multicol gutter="18" cols="2"></multicol>     <p align="left"><font face="Verdana" size="2"><b>4. Tiempo desde el inicio de los s&iacute;ntomas&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Comprender la relaci&oacute;n temporal entre la aparici&oacute;n de los s&iacute;ntomas, la reperfusi&oacute;n, el rescate del miocardio y la mortalidad es fundamental para la selecci&oacute;n de una estrategia de reperfusi&oacute;n adecuada</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#26">26</a></font><font face="Verdana" size="2"><a name="26."></a><a name="27."></a>-</font><font color="#1f1a17" face="Verdana"  size="2"><a  href="#28">28</a></font><font face="Verdana" size="2"><a name="28."></a>)</font></sup><font  face="Verdana" size="2"><b>.&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> <i>a) Las primeras tres horas&nbsp;</i> </font></p>     <p align="left"><font face="Verdana" size="2"> Los pacientes que se presentan &pound;3 horas del inicio de los s&iacute;ntomas son quienes tienen la mejor oportunidad para la franca recuperaci&oacute;n del miocardio y lograr una reducci&oacute;n significativa de la mortalidad. Gr&aacute;ficamente se agrupan en la parte inicial de la curva de sobrevida frente al tiempo de reperfusi&oacute;n (</font><font color="#1f1a17" face="Verdana" size="2"><a href="#f5">figura 5</a></font><font face="Verdana"  size="2">)</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#26">26</a></font><font face="Verdana" size="2">,</font><font  color="#1f1a17" face="Verdana" size="2"><a  href="#27">27</a></font><font face="Verdana" size="2">,</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#29">29</a></font><font face="Verdana" size="2"><a name="29."></a>)</font></sup><font face="Verdana" size="2"><b>. </b>Esto ocurre porque la terapia fibrinol&iacute;tica tiene la mayor eficacia en repermeabilizar la arteria relacionada con el infarto y porque la masa de miocardio a&uacute;n viable es mayor. Cuando el tiempo desde el inicio de los s&iacute;ntomas es &pound;3 horas y no se puede realizar ATC1&ordf; dentro de los 90 minutos, el tratamiento con FBL tiene ventajas. Por otro lado, cuando la ATC1&ordf; puede realizarse dentro de 90 minutos, esta puede restaurar el flujo normal en m&aacute;s de 90% de los pacientes mientras que los FBL lo logran aproximadamente en 50%.&nbsp;&nbsp;</font></p>     <p align="left"><font face="Verdana" size="2">    <br> <a name="f5"></a><img style="width: 410px; height: 339px;" alt=""  src="/img/revistas/ruc/v28n3/3a18f5.JPG">    <br> </font> </p>     <p><font size="2" face="Verdana">&nbsp;(<a href="#26">26</a>)</font></p>     <p align="left"><font face="Verdana" size="2"> Un paciente que consulta precozmente, pero tiene un retraso importante en la transferencia para la ATC1&ordf; (mayor de 90 minutos), puede perder r&aacute;pidamente la oportunidad de una reperfusi&oacute;n exitosa. El valor de la reperfusi&oacute;n precoz con FBL fue establecido por un metaan&aacute;lisis de 22 ensayos que incluy&oacute; a 50.246 pacientes</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#29">29</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><b>. </b>El beneficio absoluto con la terapia fibrinol&iacute;tica, en comparaci&oacute;n con placebo o control, fue mayor en los pacientes tratados dentro de la primera hora de inicio de los s&iacute;ntomas. El mismo se reduce dr&aacute;sticamente y se mantiene plano en los pacientes tratados entre la primera y la segunda hora, la segunda a la tercera, y la tercera a la sexta hora.<s>&nbsp;</s> </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> La evidencia de una posible ventaja de la fibrin&oacute;lisis sobre la ATC1&ordf; en pacientes que consultan precozmente proviene del an&aacute;lisis de subgrupos de tres ensayos aleatorizados, dos de los cuales evaluaron la eficacia de la fibrin&oacute;lisis prehospitalaria.<b> </b>Estos fueron el CAPTIM</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#30">30</a></font><font face="Verdana" size="2"><a name="30."></a>)</font></sup><font face="Verdana" size="2"><b>, </b>el MITI</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#31">31</a></font><font face="Verdana" size="2"><a  name="31."></a>)</font></sup><font  face="Verdana" size="2"><b> </b>y el<b> </b>ASSENT-3</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#32">32</a></font><font face="Verdana" size="2"><a  name="32."></a>)</font></sup><font  face="Verdana" size="2">, de los que se concluye que para los pacientes que se presentan dentro de las tres horas de aparici&oacute;n de los s&iacute;ntomas, la elecci&oacute;n entre la terapia fibrinol&iacute;tica y ATC1&ordf; depende de la demora prevista para ATC1&ordf;. Cuando el tiempo estimado entre la consulta inicial en un hospital con capacidad de ATC y el inflado del bal&oacute;n sea menos de 90 minutos, o cuando el retardo estimado entre la presentaci&oacute;n en un hospital sin capacidad de ATC y el inflado del bal&oacute;n sea menor de 120 minutos, se recomienda ATC1&ordf;</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#33">33</a></font><font face="Verdana" size="2"><a name="33."></a><a name="34."></a>-</font><font color="#1f1a17" face="Verdana" size="2"><a href="#35">35</a></font><font face="Verdana" size="2"><a  name="35."></a>)</font></sup><font  face="Verdana" size="2"><b>.</b> Estas recomendaciones coinciden con las realizadas por el Colegio Americano de Cardiolog&iacute;a / Asociaci&oacute;n Americana del Coraz&oacute;n (2013) y la Sociedad Europea de Cardiolog&iacute;a (2012)</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#12">12</a></font><font face="Verdana" size="2">,</font><font  color="#1f1a17" face="Verdana" size="2"><a  href="#13">13</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">.<b>&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> <i>b) Entre las tres y las doce horas&nbsp;</i> </font></p>     <p align="left"><font face="Verdana" size="2"> Aproximadamente la mitad de los pacientes con IAMcST se presentan con m&aacute;s de tres a cuatro horas del inicio de los s&iacute;ntomas, por lo que se ubican en la parte m&aacute;s plana de la curva de supervivencia versus tiempo-a-reperfusi&oacute;n</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#36">36</a></font><font face="Verdana" size="2"><a name="36."></a>)</font></sup><font face="Verdana" size="2"><b>. </b>En este per&iacute;odo hay una mayor eficacia de la ATC1&ordf; y una reducci&oacute;n del riesgo de accidente cerebrovascular en comparaci&oacute;n con FBL, a pesar de un mayor tiempo requerido para la transferencia. Este retraso al traslado a la ATC1&ordf; debe ser &lt;90 minutos y preferiblemente &lt;60 minutos en la mayor&iacute;a de los casos.<b>&nbsp;</b> </font></p>     <p> <font face="Verdana" size="2"> <a href="MasterFrame2_243.htm"></a></font></p> <multicol gutter="18" cols="2"></multicol>     <p align="left"><font face="Verdana" size="2"><i>c) Presentaci&oacute;n luego de las doce horas&nbsp;</i> </font></p>     <p align="left"><font face="Verdana" size="2"> Los registros sugieren que del 9 al 31% de los pacientes con IAMcST consultan luego de las 12 horas de aparecidos los s&iacute;ntomas <a  name="37."></a> </font><sup><font face="Verdana" size="2"> (</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#37">37</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17" face="Verdana" size="2"><a href="#38">38</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="38."></a>. Es improbable que la terapia fibrinol&iacute;tica administrada en este momento mejore los resultados, ya que el beneficio es peque&ntilde;o y probablemente superado por los riesgos. Sin embargo, la ATC1&ordf; puede ser beneficiosa en pacientes seleccionados. Se dispone de muy poca evidencia dado que la mayor&iacute;a de estos pacientes fueron excluidos de los ensayos m&aacute;s importantes.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> La indicaci&oacute;n de ATC1&ordf; tard&iacute;a<b> </b>(entre 12 y 24 horas) se plantea de acuerdo a la presentaci&oacute;n cl&iacute;nica. En los pacientes sintom&aacute;ticos o inestables existe consenso sobre un posible beneficio de la ATC en base a opini&oacute;n de expertos. Entre los pacientes asintom&aacute;ticos existen estudios aleatorizados que muestran mejor&iacute;a de la funci&oacute;n ventricular izquierda o el &aacute;rea del infarto, pero no en par&aacute;metros de valoraci&oacute;n cl&iacute;nicos</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#39">39 </a></font> <font face="Verdana" size="2"> <a  name="39."></a>)</font></sup><font  face="Verdana" size="2">. En estos pacientes asintom&aacute;ticos de presentaci&oacute;n tard&iacute;a se sugiere realizar una angiograf&iacute;a coronaria dentro de las 24 horas y proceder a ATC solo si la lesi&oacute;n de la arteria culpable es subtotal o en las oclusiones totales con buena circulaci&oacute;n colateral distal.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>4 Situaciones cl&iacute;nicas en las que se prefiere ATC1&ordf;&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> <i>a) Diagn&oacute;stico dudoso de IAM&nbsp;</i> </font></p>     <p align="left"><font face="Verdana" size="2"> Algunos pacientes presentan signos y s&iacute;ntomas presuntivos pero no definitivos para el diagn&oacute;stico de IAMcST. Los ejemplos incluyen historias at&iacute;picas que pudieran sugerir una pericarditis o un electrocardiograma (ECG) no diagn&oacute;stico que debiera aclararse r&aacute;pidamente para definir la indicaci&oacute;n de una estrategia de reperfusi&oacute;n. Cuando no est&aacute;n disponibles estudios como la ecocardiograf&iacute;a o la angiograf&iacute;a coronaria ser&iacute;a necesaria la transferencia para coronariograf&iacute;a y una eventual ATC inmediata si estuviera indicada.&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> <i>b) Alto riesgo de hemorragia asociada a los fibrinol&iacute;ticos&nbsp;</i> </font></p>     <p align="left"><font face="Verdana" size="2"> La terapia FBL implica un mayor riesgo de sangrado comparado con la ATC1&ordf;. La hemorragia intracraneal es el m&aacute;s grave de estos riesgos y se presenta en 0,7% de los pacientes tratados con fibrinol&iacute;ticos</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#17">17</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#40">40</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="40."></a>. Los pacientes con contraindicaciones para FBL representan un grupo de alto riesgo y, aunque no hay datos espec&iacute;ficos para esta poblaci&oacute;n, parecen beneficiarse de la ATC1&ordf;</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#37">37</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><b>.&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> <i>c) Pacientes de muy alto riesgo&nbsp;</i> </font></p>     <p align="left"><font face="Verdana" size="2"> Los beneficios de la ATC1&ordf; sobre la fibrin&oacute;lisis son aun mayores en los pacientes de muy alto riesgo y en el shock cardiog&eacute;nico</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#41">41 </a></font><font face="Verdana" size="2"> <a name="41."></a>,</font><font color="#1f1a17" face="Verdana" size="2"><a href="#42">42</a></font><font face="Verdana" size="2"> <a  name="42."></a>)</font></sup><font  face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Este punto se defini&oacute; en un an&aacute;lisis de 16 ensayos aleatorizados que comparan ATC1&ordf; con FBL</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#43">43</a></font><font face="Verdana" size="2"> <a  name="43."></a>)</font></sup><font  face="Verdana" size="2">. Seg&uacute;n este estudio, cuando el incremento en el riesgo de mortalidad basal asciende de 4,4% a 12,4%, es aceptable un mayor retardo a la ATC que ir&iacute;a de 43 a 200 minutos. Dentro de estos, los pacientes con shock cardiog&eacute;nico representan una poblaci&oacute;n especialmente grave en los que la ATC1&ordf; es preferible a la fibrin&oacute;lisis. Si en estos pacientes la ATC1&ordf; no est&aacute; disponible en menos de 120 minutos, hay evidencia de que pueden beneficiarse de la administraci&oacute;n de FBL, la colocaci&oacute;n de un bal&oacute;n de contrapulsaci&oacute;n y su transferencia para ATC. Los FBL no deben retrasar los arreglos para la transferencia urgente a ATC</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#44">44</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="44."></a>.<s>&nbsp;</s> </font></p> <multicol gutter="18" cols="2"></multicol>     <p align="left"><font face="Verdana" size="2"><b>III. Angioplastia pos FBL&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> <b>1. Angioplastia coronaria de rescate por fracaso de FBL&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> El fracaso primario de la fibrin&oacute;lisis, definida en los ensayos cl&iacute;nicos como la oclusi&oacute;n persistente de la arteria relacionada con el infarto (TIMI grado 0/1) mediante angiograf&iacute;a realizada a los 90 minutos posinfusi&oacute;n del fibrinol&iacute;tico, oscila entre 40% y 50%</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#10">10</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#11">11</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2">. Debe sospecharse cl&iacute;nicamente por la persistencia del dolor, inestabilidad hemodin&aacute;mica o una renivelaci&oacute;n del segmento ST &lt; 50%.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> La angioplastia coronaria de rescate se define como aquella ATC realizada dentro de las 12 horas de la fibrin&oacute;lisis fallida (fallo primario) en pacientes con evidencia de isquemia persistente o recurrente</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#19">19</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">. La angiograf&iacute;a permite evaluar el flujo coronario TIMI as&iacute; como el flujo microvascular medido por el blush mioc&aacute;rdico, que son predictores de sobrevida a largo plazo</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#45">45 </a></font> <font face="Verdana" size="2"> <a  name="45."></a>)</font></sup><font  face="Verdana" size="2">. Varios estudios cl&iacute;nicos randomizados (RESCUE, MERLIN, REACT) y un metaan&aacute;lisis evaluaron el beneficio de la angioplastia de rescate</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#46">46</a></font><font face="Verdana" size="2"><a  name="46."></a><a name="47."></a><a name="48."></a>-</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#49">49</a></font><font face="Verdana" size="2"> <a name="49."></a>)</font></sup><font  face="Verdana" size="2"><b>.</b> Esta se deber&iacute;a plantear precozmente cuando a los 45 a 60 minutos de la fibrin&oacute;lisis no existen criterios cl&iacute;nicos de reperfusi&oacute;n.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Los pacientes que m&aacute;s se benefician de la ATC de rescate son los de mayor riesgo, aquellos con shock cardiog&eacute;nico, hipotensi&oacute;n significativa, insuficiencia card&iacute;aca grave, ECG con evidencia de una extensa zona amenazada (regi&oacute;n anterior o inferior con compromiso de ventr&iacute;culo derecho o infradesnivel del ST en regi&oacute;n anterior) o flujo TIMI &pound; 2. (Indicaci&oacute;n clase II, nivel de evidencia B). Por otra parte, el tratamiento conservador podr&iacute;a ser razonable en un paciente con un infarto inferior con mejor&iacute;a de los s&iacute;ntomas a pesar de persistencia de la elevaci&oacute;n del ST </font><sup><font face="Verdana" size="2"> (</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#18">18</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#19">19</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2">.&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> En suma, luego de una fibrin&oacute;lisis fallida se recomienda la angioplastia de rescate en lugar de la repetici&oacute;n de fibrin&oacute;lisis o el tratamiento conservador. Si la angioplastia de rescate no puede realizarse dentro de las 12 horas, se sugiere tratamiento conservador frente a repetir la fibrin&oacute;lisis.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>2. Angioplastia coronaria por reoclusi&oacute;n pos FBL&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Despu&eacute;s de la fibrin&oacute;lisis aparentemente exitosa por criterios cl&iacute;nicos, la recurrencia temprana de isquemia o cambios del segmento ST se ha observado en 20% a 30% de los pacientes, la reoclusi&oacute;n coronaria tromb&oacute;tica en 5% a 15%, y el reinfarto en 3% a 5%</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#50">50</a></font><font face="Verdana" size="2">) <a name="50."></a> </font></sup><font face="Verdana" size="2">. En los estudios GUSTO I-II-III, TIMI e InTIME, el reinfarto ocurri&oacute; en 4,3% de los pacientes con una media de dos a cuatro d&iacute;as despu&eacute;s de los fibrinol&iacute;ticos y fue independiente del agente fibrinol&iacute;tico utilizado</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#51">51 </a></font> <font face="Verdana" size="2"> <a  name="51."></a>)</font></sup><font  face="Verdana" size="2">. Estos pacientes tienen un peor pron&oacute;stico con una mayor mortalidad a los 30 d&iacute;as y al a&ntilde;o; la mortalidad hospitalaria disminuye cuando se les realiza una angioplastia coronaria de rescate (23,6% en tratamiento m&eacute;dico conservador versus 5,2% con angioplastia de rescate) <a name="52."></a></font><sup><font face="Verdana" size="2"> (</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#52">52</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#53">53</a></font><font face="Verdana" size="2"><a  name="53."></a>)</font></sup><font  face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> En suma, para los pacientes con evidencia de reoclusi&oacute;n despu&eacute;s de la fibrin&oacute;lisis exitosa, se sugiere la angioplastia coronaria en lugar del tratamiento conservador.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>3. Angioplastia coronaria facilitada&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Consiste en la angioplastia coronaria de la arteria causante del infarto en las 12 primeras horas, de forma rutinaria y planeada, en los pacientes tratados inicialmente con una terapia farmacol&oacute;gica dirigida a lograr la apertura arterial. Su objetivo es intentar lograr una recuperaci&oacute;n del flujo a nivel de la arteria &ldquo;culpable&rdquo; antes de la llegada a la sala de hemodinamia y luego abrir la arteria (si no lo estaba), o eliminar la estenosis residual y asegurar la permeabilidad arterial a largo plazo.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Esta estrategia terap&eacute;utica se plantea en los centros hospitalarios en que el tiempo puerta-bal&oacute;n es mayor a 120 minutos. Se han probado planes de FBL a dosis completa o a la mitad, ya sea con o sin inhibidores de la glicoprote&iacute;na IIb/IIIa. La estrategia de usar una dosis completa del fibrinol&iacute;tico fue analizada en la d&eacute;cada de 1980 (estudio TAMI I-II), &eacute;poca de la angioplastia coronaria con bal&oacute;n, no demostr&aacute;ndose que la angioplastia inmediata luego de rTPA ofreciera ventaja sobre una angioplastia electiva, incrementando los sangrados</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#54">54 </a></font> <font face="Verdana" size="2"> <a  name="54."></a>,</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#55">55</a></font><font face="Verdana" size="2"> <a name="55."></a>)</font></sup><font face="Verdana" size="2">.<s>&nbsp;</s> </font></p>     <p align="left"><font face="Verdana" size="2"> Estudios m&aacute;s recientes como el CAPITAL AMI y el ASSENT-4</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#56">56</a></font><font face="Verdana" size="2"><a  name="56."></a>,</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#57">57</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><a name="57."></a> que incluyeron la administraci&oacute;n de terapia antiplaquetaria dual, el uso de cat&eacute;teres de bajo perfil y stents coronarios, han revalorado la angioplastia facilitada. Estos estudios mostraron resultados adversos para la angioplastia facilitada en la mayor&iacute;a de los subgrupos, incluyendo los pacientes precoces (s&iacute;ntomas &lt; 2 horas) y los pacientes de alto riesgo, como aquellos con un IAM anterior o diab&eacute;ticos. La evidencia que alert&oacute; sobre los perjuicios de la estrategia de ATC facilitada con FBL surgi&oacute; del metaan&aacute;lisis de Keeley en el que, si bien se observ&oacute; un aumento significativo en el flujo inicial de TIMI 3 (42% versus 15%), tambi&eacute;n se comprob&oacute; un aumento en las tasas de mortalidad a corto plazo (6% versus 4%), reinfarto no fatal (4% versus 2%), revascularizaci&oacute;n urgente del vaso tratado (5% versus 1%), accidente cerebrovascular (1,6% versus 0,3%), y un aumento no significativo de hemorragias mayores (7% versus 5%)</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#58">58</a></font><font face="Verdana" size="2"> <a name="58."></a>)</font></sup><font  face="Verdana" size="2">. Asimismo, la combinaci&oacute;n de un inhibidor de la GP IIb/IIIa y la mitad de dosis de un agente fibrinol&iacute;tico antes de la ATC (estudios FINESSE y BRAVE) se mostr&oacute; ineficaz en comparaci&oacute;n con GP IIb/IIIa en el momento de la ATC, por lo que no se recomienda</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#59">59</a></font><font face="Verdana" size="2"><a  name="59."></a>)</font></sup><font  face="Verdana" size="2">. &nbsp;(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="/img/revistas/ruc/v28n3/3a18f6.JPG">figura 6</a></font><font face="Verdana" size="2">)</font></p> <multicol gutter="18" cols="2"></multicol>     <p align="left"><font face="Verdana" size="2">En suma, la angioplastia facilitada sobre todo dentro de las primeras dos horas de la administraci&oacute;n del FBL, no se debe realizar debido a un aumento significativo de la mortalidad y otros eventos adversos.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>4. Estrategia f&aacute;rmaco-invasiva&nbsp;</b> </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> Si bien la estrategia de ATC facilitada fue desalentada por un mayor &iacute;ndice de complicaciones en la d&eacute;cada de 1990, luego del a&ntilde;o 2000 se replante&oacute; el estudio de la estrategia combinada (f&aacute;rmaco-invasiva) en el contexto de la disponibilidad de stents coronarios y modernos reg&iacute;menes antiplaquetarios. Destacamos al respecto los estudios GRACIA-1 y 2, el registro FAST-MI, TRANSFER-AMI, NORDISTEMI y finalmente el metaan&aacute;lisis de Borgia</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#60">60</a></font><font face="Verdana" size="2"><a  name="60."></a><a name="61."></a><a name="62."></a><a name="63."></a> -</font><font  color="#1f1a17" face="Verdana" size="2"><a  href="#64">64</a></font><font face="Verdana" size="2"><a name="64."></a>)</font></sup><font  face="Verdana" size="2">. En estos estudios el tiempo entre los FBL y la intervenci&oacute;n coronaria fue mayor de dos a tres horas, por lo que se evit&oacute; actuar inmediatamente despu&eacute;s de los FBL, momento en que existe un estado protromb&oacute;tico. En un metaan&aacute;lisis publicado en 2010, la incidencia de muerte o reinfarto a los 30 d&iacute;as fue menor con la estrategia f&aacute;rmaco-invasiva (OR: 0,65, IC95%, 0,49-0,88), sin un aumento significativo de hemorragias graves (OR: 0,93, IC95%, 0,67-1,34) ni de accidente cerebrovascular (OR: 0,63, IC95%, 0,31-1,26; p=0,21). Los beneficios de una estrategia invasiva sistem&aacute;tica sobre la terapia est&aacute;ndar se mantuvieron a los 6-12 meses</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#64">64</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> El &uacute;ltimo estudio publicado sobre la estrategia f&aacute;rmaco-invasiva es el STREAM, el cual incluy&oacute; a 1.892 pacientes con IAMcST con &lt; 3 horas de inicio de los s&iacute;ntomas y que no pod&iacute;an someterse a una angioplastia coronaria primaria dentro de los 60 minutos. Se aleatorizaron a ATC1&ordf; (grupo ATC1&ordf;) o fibrin&oacute;lisis con tenecteplase con doble antiagregaci&oacute;n y enoxaparina, previo al traslado a coronariograf&iacute;a de urgencia y eventual ATC (grupo f&aacute;rmaco-invasivo). Si la fibrin&oacute;lisis era exitosa, se trasladaba a un hospital con laboratorio de hemodinamia entre las 6 a 24 horas luego de la aleatorizaci&oacute;n, y si no era exitosa (90 minutos posfibrin&oacute;lisis) se trasladaba de emergencia</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#65">65</a></font><font face="Verdana" size="2">) <a name="65."></a> </font></sup><font  face="Verdana" size="2">. El criterio de valoraci&oacute;n primario compuesto de muerte, shock, insuficiencia card&iacute;aca congestiva o reinfarto a 30 d&iacute;as, fue de 12,4% en el grupo f&aacute;rmaco-invasivo y de 14,3% en el grupo de ATC1&ordf; (RR grupo fibrin&oacute;lisis 0,86, IC95%, 0,68-1,09, p=0,21) (</font><font color="#1f1a17" face="Verdana" size="2"><a href="#f7">figura 7</a></font><font  face="Verdana" size="2">). Del grupo que recibi&oacute; fibrin&oacute;lisis, 36,3% requiri&oacute; traslado de emergencia (46,5% de estos pacientes ten&iacute;an un flujo TIMI 0/1 en la arteria culpable) y el resto fue trasladado a ATC con una media de 17 horas (en este grupo el flujo TIMI 2 y 3 estaban presentes en 13,2% y 72,8% de los pacientes, respectivamente). Hubo un incremento leve en las hemorragias en el grupo fibrin&oacute;lisis (0,5% versus 0,3%, p=0,45), no habiendo diferencia entre grupos en los sangrados no intracraneales. Los autores concluyen que la estrategia f&aacute;rmaco-invasiva permite obtener los mismos resultados que la ATC1&ordf; (salvo un leve incremento del sangrado cerebro-vascular) a trav&eacute;s de un procedimiento invasivo programado (en las primeras 24 horas) en m&aacute;s de 60% de los pacientes.&nbsp; </font></p> <font face="Verdana"> <a name="f7"><font size="2"></font></a><font size="2"><img style="width: 396px; height: 349px;" alt=""  src="/img/revistas/ruc/v28n3/3a18f7.JPG">    <br> (<a href="#65">65</a>)</font></font><multicol gutter="18"  cols="2"></multicol><font face="Verdana" size="2"> </font>     <p align="left"><font face="Verdana" size="2">En suma, se recomienda la coronariograf&iacute;a diagn&oacute;stica y eventual angioplastia coronaria para los pacientes que reciben tratamiento fibrinol&iacute;tico exitoso en un plazo de 2-3 a 24 horas, discriminados por grupos de riesgo:&nbsp; </font></p> <ul>       <li><font face="Verdana" size="2">Para los pacientes de alto riesgo: IAM anterior, Killip Kimbal &sup3; 2, IAM inferior con compromiso del ventr&iacute;culo derecho, presi&oacute;n arterial sist&oacute;lica &lt;100 mmHg, frecuencia card&iacute;aca &gt;100 cpm, la angiograf&iacute;a debe ser realizada tan pronto como sea posible luego de dos horas de la fibrin&oacute;lisis.&nbsp; </font></li>       <li><font face="Verdana" size="2">Para los pacientes que no tienen alto riesgo el momento &oacute;ptimo de la angiograf&iacute;a de rutina y posible angioplastia coronaria no se ha determinado; se plantea que se debe realizar dentro de 3 a 24 horas (v&eacute;ase algoritmo de la </font>   <font color="#1f1a17" face="Verdana" size="2"> <a  href="/img/revistas/ruc/v28n3/3a18f6.JPG">figura 6</a></font><font face="Verdana" size="2">).&nbsp; (<a href="#19">19</a>).</font></li>     </ul>     <p></p>     <p align="left"><font face="Verdana" size="2"><b>5. Angioplastia coronaria pos FBL en el shock cardiog&eacute;nico&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Otra indicaci&oacute;n de angioplastia de urgencia luego de la fibrin&oacute;lisis es el shock cardiog&eacute;nico. El estudio SHOCK demostr&oacute; el beneficio de la angiograf&iacute;a coronaria y revascularizaci&oacute;n de emergencia (ya sea con ATC o cirug&iacute;a de revascularizaci&oacute;n mioc&aacute;rdica [CRM]) en comparaci&oacute;n con la estabilizaci&oacute;n m&eacute;dica inmediata y revascularizaci&oacute;n tard&iacute;a. El beneficio de la revascularizaci&oacute;n fue evidente a trav&eacute;s de una ventana de tiempo muy amplia, hasta 54 horas despu&eacute;s del IAM y 18 horas despu&eacute;s de la aparici&oacute;n del shock, aunque debe realizarse tan pronto como sea posible (teor&iacute;a de la espiral descendente de la isquemia que perpet&uacute;a al shock).&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> En comparaci&oacute;n con la ATC1&ordf;, la fibrin&oacute;lisis por s&iacute; sola es relativamente ineficaz en pacientes con shock cardiog&eacute;nico salvo que la presi&oacute;n de perfusi&oacute;n coronaria se incremente por vasopresores y/o con bal&oacute;n de contrapulsaci&oacute;n intraa&oacute;rtico. Por lo tanto, los pacientes ingresados en hospitales sin hemodinamia deben ser transferidos inmediatamente a un centro de atenci&oacute;n terciaria con la intenci&oacute;n de reperfusi&oacute;n precoz.&nbsp; </font></p> <font face="Verdana" size="2">     <br> </font>     <p align="left"><font face="Verdana" size="2"> <b>IV. Evoluci&oacute;n de la t&eacute;cnica de la ATC en el IAMcST&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> <b>1. Selecci&oacute;n del acceso vascular&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> La selecci&oacute;n del acceso vascular para la realizaci&oacute;n de la ATC1&ordf; ha demostrado ser un aspecto importante, dado que es el sitio de sangrado m&aacute;s frecuente, pudiendo incidir en la tasa de mortalidad. Con el acceso femoral se ha comprobado una mayor tasa de complicaciones que con el acceso radial, habi&eacute;ndose identificado varios predictores de sangrado: sexo femenino, edad avanzada, enfermedad renal cr&oacute;nica, anemia, uso del bal&oacute;n intraa&oacute;rtico de contrapulsaci&oacute;n, uso de inhibidores de GP IIb/IIIa y la administraci&oacute;n de heparina de bajo peso en las 48 horas previas al procedimiento</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#67">67 </a></font> <font face="Verdana" size="2"> <a  name="67."></a>)</font></sup><font  face="Verdana" size="2">. El estudio RIVAL (STEMI), que compar&oacute; ambos tipos de accesos, no mostr&oacute; una reducci&oacute;n significativa en el par&aacute;metro de valoraci&oacute;n primario de muerte, IAM, accidente cerebro vascular y sangrado mayor no relacionado a CRM, pero con el abordaje radial mostr&oacute; una disminuci&oacute;n de las complicaciones vinculadas al acceso</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#68">68</a></font><font face="Verdana" size="2">)<a name="68."></a></font></sup><font  face="Verdana" size="2">. El estudio italiano RIFLE-STEACS, en el que se incluyeron pacientes de mayor riesgo, realizado en hospitales de alto volumen y por operadores con gran experiencia en acceso radial, evidenci&oacute; una disminuci&oacute;n significativa del MACE (Mayor Acute Cardiac Events) con este acceso versus femoral (16,3% versus 21%, p=0,003), como tambi&eacute;n menor incidencia de hemorragia, de estancia hospitalaria y de muerte cardiovascular (5,2% versus 9,2%, p=0,02)</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#69">69</a></font><font face="Verdana" size="2"> <a  name="69."></a>)</font></sup><font  face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Las &uacute;ltimas gu&iacute;as para el manejo de IAMcST de la Colegio Americano de Cardiolog&iacute;a/Asociaci&oacute;n Americana del Coraz&oacute;n y de la Sociedad Espa&ntilde;ola de Cardiolog&iacute;a realizan una recomendaci&oacute;n de tipo IIa, nivel de evidencia B, para el uso del acceso radial por parte de operadores experimentados</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#18">18</a></font><font face="Verdana" size="2">,</font><font  color="#1f1a17" face="Verdana" size="2"><a  href="#19">19</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">. En Uruguay, m&aacute;s de 90% de las ATC, incluidas las primarias, se realizan por acceso radial, lo que traduce una alta experiencia de los cardi&oacute;logos intervencionistas con este m&eacute;todo, dando mayor seguridad a los pacientes.&nbsp; </font></p> <multicol gutter="18" cols="2"></multicol>     <p align="left"><font face="Verdana" size="2">En suma, la utilizaci&oacute;n del acceso radial para la ATC1&ordf; por operadores experimentados se traducir&aacute; en un beneficio cl&iacute;nico para los pacientes.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>2. Uso de stents convencionales (BMS) en el IAM&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Uno de los avances m&aacute;s importantes en la pr&aacute;ctica de la cardiolog&iacute;a intervencionista ha sido la incorporaci&oacute;n de los stents coronarios, introducidos en los a&ntilde;os 80 por Sigwart, Roubin, Palmaz y Schatz, entre otros</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#70">70</a></font><font face="Verdana" size="2"><a name="70."></a>)</font></sup><font face="Verdana" size="2">, siendo actualmente usados en forma rutinaria tanto en la enfermedad coronaria estable como en los s&iacute;ndromes coronarios agudos.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Los stents met&aacute;licos (BMS) fueron creados para superar las limitaciones del bal&oacute;n y disminuir sus complicaciones. Entre estas destacaba la reestenosis, que ocurr&iacute;a en 10% a 15% de los pacientes antes del alta</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#5">5</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#71">71</a></font><font face="Verdana" size="2"><a name="71."></a> )</font></sup><font face="Verdana" size="2">, y 35%-40% a los seis meses</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#72">72 </a></font> <font face="Verdana" size="2"> <a  name="72."></a>,</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#73">73</a></font><font face="Verdana" size="2"> <a name="73."></a>) </font> </sup><font face="Verdana" size="2"><b>.</b> La oclusi&oacute;n aguda de la arteria llevaba hasta a un 4% de los pacientes a CRM de emergencia.&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> Inicialmente, los stents se evitaban en el ambiente &ldquo;protromb&oacute;tico&rdquo; del IAM y se utilizaban como medida de rescate frente al cierre agudo o disecci&oacute;n de la arteria tratada. Dos estudios cl&aacute;sicos, BENEStent</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#74">74 </a></font> <font face="Verdana" size="2"> <a  name="74."></a>)</font></sup><font  face="Verdana" size="2"> y STRESS</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#75">75</a></font><font face="Verdana" size="2"> <a  name="75."></a>)</font></sup><font  face="Verdana" size="2">, fueron fundamentales para pasar de la angioplastia tradicional con bal&oacute;n al uso de stent como alternativa a la cirug&iacute;a de bypass coronario fuera del ambiente del IAM. Sin embargo, en los primeros trabajos con stents, la trombosis intrastent (TS) era frecuente</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#76">76</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><b><a name="76."></a>.</b> Con el uso de la doble terapia antiplaquetaria se logr&oacute; mejorar dichos resultados</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#77">77</a></font><font face="Verdana" size="2"> <a name="77."></a><a name="78."></a><a name="79."></a>-</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#80">80</a></font><font face="Verdana" size="2"><a name="80."></a>)</font></sup><font  face="Verdana" size="2"><b>.</b>&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Entre fines de la d&eacute;cada de 1990 y principios del a&ntilde;o 2000 fueron surgiendo estudios que mostraron el beneficio del BMS sobre el bal&oacute;n en el contexto del IAM <a name="81."></a> </font><sup><font face="Verdana" size="2"> (</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#81">81</a></font><font face="Verdana" size="2"><a  name="82."></a><a name="83."></a><a name="84."></a>-</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#85">85</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="85."></a>. El CADILLAC </font><sup><font face="Verdana" size="2"> (</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#86">86</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><a name="86."></a> mostr&oacute; que su uso en la ATC1&ordf; ten&iacute;a menor tasa de oclusi&oacute;n de la arteria vinculada al IAM (5,7% para BMS versus 11,3% para bal&oacute;n, p=0,01), mientras que la reestenosis en la angiograf&iacute;a de control fue tambi&eacute;n menor para BMS que para bal&oacute;n (22,2 versus 40,8%, p&lt;0,001). Otros estudios, como el ADMIRAL </font><sup> <font face="Verdana" size="2"> (</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#87">87</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"> <a name="87."></a>e ISAR-2 </font><sup><font face="Verdana" size="2"> (</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#88">88</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><b><a name="88."></a>,</b> ampliaron la evidencia cient&iacute;fica, por lo que hoy d&iacute;a los BMS se utilizan en forma rutinaria en la ATC1&ordf;. Si bien la mortalidad tuvo una tendencia a ser menor en la ATC1&ordf; con stent</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#89">89</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><b>,<a name="89."></a></b> ensayos y metaanalisis m&aacute;s recientes</font><sup><font face="Verdana" size="2"><a name="90."></a>(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#90">90</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17"  face="Verdana" size="2"><a  href="#91">91</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><a name="91."></a> mostraron que los BMS no modificaron la mortalidad en forma estad&iacute;sticamente significativa.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> En suma, la utilizaci&oacute;n de BMS es t&eacute;cnicamente posible y segura en la gran mayor&iacute;a de los casos de IAMcST sometidos a ATC1&ordf;, disminuyendo a la mitad la necesidad de reintervenciones.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>3. Uso de stents liberadores de drogas (DES) en el IAM&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> Fuera del contexto del IAM, la primera generaci&oacute;n de DES liberadores de paclitaxel y sirolimus logr&oacute; disminuir la necesidad de nueva revascularizaci&oacute;n del vaso tratado en 60% a 70%</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#92">92</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><b> <a name="92."></a>.&nbsp;</b> Sin embargo, en algunos ensayos estos stents se asociaron a un aumento de la trombosis muy tard&iacute;a (luego del a&ntilde;o), sin aumento de la mortalidad</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#92">92</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">. En el registro SCAAR la mortalidad fue similar con DES o con BMS (RR 1,03, 95% IC 0,94-1,14)</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#93">93</a></font><font face="Verdana" size="2">) <a name="93."></a> </font></sup><font  face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Dado el ambiente protromb&oacute;tico en los pacientes con IAM y la observaci&oacute;n de un aumento de la trombosis tard&iacute;a y muy tard&iacute;a con el uso de stents</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#94">94</a></font><font face="Verdana" size="2">)<a name="94."></a></font></sup><font face="Verdana" size="2"> (0,5% de los pacientes)</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#95">95</a></font><font face="Verdana" size="2">) <a name="95."></a> </font></sup><font  face="Verdana" size="2"><b>,</b> surgieron dudas sobre la eficacia y seguridad de los DES en este escenario cl&iacute;nico. Registros iniciales, un peque&ntilde;o estudio aleatorizado unic&eacute;ntrico</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#96">96</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"> <a name="96."></a>, y posteriormente dos grandes estudios randomizados (TYPHOON</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#97">97</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"> <a name="97."></a>y PASSION</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#98">98</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">)<a name="98."></a> confirmaron la seguridad y eficacia de los DES en el IAM. Resultados de metaan&aacute;lisis con mayor seguimiento mostraron resultados similares</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#99">99</a></font><font face="Verdana" size="2">)<a  name="99."></a></font></sup><font face="Verdana"  size="2">. Los DES de &uacute;ltima generaci&oacute;n que incorporan los f&aacute;rmacos biolimus A9, everolimus y zotarolimus utilizados en algunos ensayos, tienen un similar perfil de eficiencia y seguridad</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#100">100</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="100."></a>. El uso de everolimus (frente a sirolimus) mostr&oacute; una disminuci&oacute;n de la revascularizaci&oacute;n del vaso culpable, (5,7 versus 8,8, p=0,04) y menor incidencia de trombosis intrastent.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Actualmente, las gu&iacute;as de tratamiento del IAM recomiendan el uso de DES o BMS (clase I, nivel de evidencia A), estando los DES contraindicados en aquellos pacientes con elevado riesgo de sangrado o que no puedan cumplir con la doble antiagregaci&oacute;n al menos por un a&ntilde;o, dado el riesgo aumentado de TS</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#18">18</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> En suma, el uso de DES en el IAM en comparaci&oacute;n con los BMS, disminuye la tasa de reestenosis y reintervenci&oacute;n. Los stents con everolimus parecen vincularse a menores eventos adversos.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>4. Stent directo versus predilataci&oacute;n con bal&oacute;n&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> La t&eacute;cnica de implante del stent coronario en el IAM ha sido analizada en diversos estudios. Trabajos iniciales, como el PAMI y el CADILLAC, utilizaron la predilataci&oacute;n con bal&oacute;n, mientras otros</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#87">87</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17" face="Verdana" size="2"><a href="#88">88</a></font><font face="Verdana" size="2">,</font><font color="#1f1a17" face="Verdana" size="2"><a href="#101">101</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"> <a name="101."></a>utilizaron el implante de stent directo planteando que tambi&eacute;n es esta una pr&aacute;ctica segura.&nbsp; </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font face="Verdana" size="2"> Seg&uacute;n estos y otros estudios m&aacute;s recientes</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#102">102</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><b><a name="102."></a> </b>se mantiene la postura de que no existir&iacute;a beneficio de la predilataci&oacute;n excepto en situaciones espec&iacute;ficas. La estrategia de stent directo se utiliza principalmente cuando se logra visualizar la lesi&oacute;n en toda su extensi&oacute;n, con la te&oacute;rica finalidad de reducir la tasa de embolizaci&oacute;n y &ldquo;no-reflow&rdquo;. Dentro de las ventajas potenciales se describe el menor da&ntilde;o endotelial al no utilizar el bal&oacute;n. Por otro lado, las situaciones en las cuales habr&iacute;a que considerar la predilataci&oacute;n con bal&oacute;n ser&iacute;an como &ldquo;pretratamiento&rdquo; de la lesi&oacute;n con anatom&iacute;a compleja (lesiones tortuosas, anguladas o calcificadas) que pudieran dificultar el pasaje del stent. El implante directo del stent sobre lesiones calcificadas sin predilatar podr&iacute;a provocar subexpansi&oacute;n y mala aposici&oacute;n del stent, siendo fuertes predictores de TS, situaci&oacute;n que se agravar&iacute;a con el implante de DES.&nbsp; </font></p>     <p> <multicol gutter="18" cols="2"></multicol></p>     <p align="left"><font face="Verdana" size="2">En suma: no es posible hacer una recomendaci&oacute;n general para el uso de stent en forma directa o con predilataci&oacute;n con bal&oacute;n, quedando esta decisi&oacute;n a criterio del cardi&oacute;logo intervencionista actuante y de acuerdo a las caracter&iacute;sticas particulares de cada paciente.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> <b>5. Tromboaspiraci&oacute;n&nbsp;</b> </font></p>     <p align="left"><font face="Verdana" size="2"> En un intento de disminuir la carga tromb&oacute;tica intraluminal y las complicaciones asociadas a la angioplastia (embolia distal, fen&oacute;meno de &ldquo;no-reflow&rdquo;) en el IAM, se han desarrollado distintos sistemas de trombectom&iacute;a o trombolisis mec&aacute;nica. En los &uacute;ltimos a&ntilde;os varios sistemas con resultados diversos se han utilizado para este prop&oacute;sito</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#103">103</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="103."></a>.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> Estudios iniciales como el SAFER</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#104">104</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="104."></a> (en puentes venosos) y X-amine</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#105">105</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2"><a name="105."></a> (en el IAM), mostraron cierto beneficio en mejorar el flujo coronario final y el di&aacute;metro final del vaso tratado</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17"  face="Verdana" size="2"><a href="#106">106</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="106."></a>. El X-amine obtuvo mayor renivelaci&oacute;n del segmento ST usando el sistema X-Sizer. Otros estudios, como el EMERALD, que utiliz&oacute; el sistema GuardWire, si bien logr&oacute; rescatar material mascrosc&oacute;pico aspirado en el 73% de los casos, esto no se tradujo en mayor renivelaci&oacute;n del segmento ST, menor tama&ntilde;o del infarto o menor tasa de MACE </font><sup><font face="Verdana" size="2"> (</font><font color="#1f1a17" face="Verdana"  size="2"><a href="#107">107</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="107."></a>. En 2005, el ensayo REMEDIA mostr&oacute; que la realizaci&oacute;n de la tromboaspiraci&oacute;n era posible y mejoraba la reperfusi&oacute;n tanto angiogr&aacute;fica como electrocardiogr&aacute;fica (renivelaci&oacute;n del ST)</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#108">108</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="108."></a>. Un metaan&aacute;lisis de 21 estudios randomizados (realizados entre 1990 y 2006) concluy&oacute; que el uso de dispositivos mec&aacute;nicos para tromboaspirar en el IAM era eficaz en prevenir la embolizaci&oacute;n distal, logrando mejor perfusi&oacute;n mioc&aacute;rdica, pero sin mejorar la supervivencia</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#109">109</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2">.&nbsp;<a name="109."></a> </font></p>     <p align="left"><font face="Verdana" size="2"> En el mismo a&ntilde;o, otro metaan&aacute;lisis de estudios aleatorizados mostr&oacute; mejor flujo TIMI 3 (87,1% versus 81,2%, p&lt;0,0001), blush 3 (52,1% versus 31,7%, p&lt;0,0001) y agreg&oacute; a la evidencia una disminuci&oacute;n de la mortalidad a 30 d&iacute;as con la tromboaspiraci&oacute;n manual (1,7% versus 3,1%, p=0,04)</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#110">110</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="110."></a>. El seguimiento a dos a&ntilde;os de la ATC aislada versus ATC con tromboaspiraci&oacute;n manual (con el cat&eacute;ter Export), mostr&oacute; que la incidencia de eventos card&iacute;acos mayores fue de 13.7% versus 4,5% (p=0,038) y muerte card&iacute;aca 6,8% versus 0% (p=0,012), constat&aacute;ndose una disminuci&oacute;n de la muerte card&iacute;aca con mejor&iacute;a del blush y la renivelaci&oacute;n del segmento ST</font><sup><font face="Verdana" size="2">(</font><font  color="#1f1a17" face="Verdana" size="2"><a href="#111">111</a></font><font face="Verdana" size="2">)</font></sup><font face="Verdana" size="2"><a name="111."></a>. Los beneficios mostrados por los dispositivos de aspiraci&oacute;n manual fueron incorporados en las &uacute;ltimas gu&iacute;as de pr&aacute;ctica cl&iacute;nica, recomend&aacute;ndose el uso de tromboaspiraci&oacute;n manual como indicaci&oacute;n clase IIa, con un nivel de evidencia de tipo B</font><sup><font face="Verdana" size="2">(</font><font color="#1f1a17" face="Verdana" size="2"><a  href="#18">18</a></font><font face="Verdana" size="2">)</font></sup><font  face="Verdana" size="2">.&nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"> En suma: si bien la evidencia disponible no es concluyente, hay consenso en que la tromboaspiraci&oacute;n manual durante la ATC1&ordf; es &uacute;til en la mayor&iacute;a de los pacientes, al permitir mejorar el grado de perfusi&oacute;n coronaria implicando probablemente una mejor&iacute;a de los resultados cl&iacute;nicos.&nbsp; </font></p> <font face="Verdana" size="2">     <br> </font>     <p align="left"><font face="Verdana" size="2"> <b>Bibliograf&iacute;a&nbsp;</b> </font></p>     ]]></body>
<body><![CDATA[<!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="1"></a> </font><font color="#1f1a17" face="Verdana" size="2"><a href="#1."> 1</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Lluberas R, Buitr&oacute;n F, Senra H.</b> Fibrinol&iacute;ticos por v&iacute;a sist&eacute;mica en el infarto agudo de miocardio. Rev M&eacute;d Urug 1986; 2(1): 85-9.    &nbsp; </font></p>     <!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="2"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#2.">2</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Buitr&oacute;n F, Men&eacute;ndez H, Lluberas R, Arg&oacute;n L, Senra H, Fronzutti A.</b> Angioplastia transluminal coronaria. Res&uacute;menes del 7&ordm; Congreso Uruguayo de Cardiolog&iacute;a.    &nbsp; </font></p>     <!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="3"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#3.">3</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Comit&eacute; de Hemodinamia de la Sociedad Uruguaya de Cardiolog&iacute;a.</b> Registro Nacional del Tratamiento Intervencionista del Infarto Agudo de Miocardio en Uruguay (RENATIA). Rev Urug Cardiol 2006; 21(3): 218-23.    &nbsp; </font></p>     <!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="4"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#4.">4</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Pardi&ntilde;as C, Buitr&oacute;n F, Dura&igrave;n A, Lluberas R, Artucio C, D&iacute;az P, et al.</b> National Registry Of Interventional Treatment Of Acute Myocardial Infarction In Uruguay (RENATIA): 30 day mortality results. Am J Cardiol 2002; 90(Suppl 6A): 186H.    &nbsp; </font></p>     <!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="5"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#5.">5</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Hartzler GO, Rutherford BD, McConahay DR, Johnson WL Jr, McCallister BD, Gura GM Jr, et al.</b> Percutaneous transluminal coronary angioplasty with and without thrombolytic therapy for treatment of acute myocardial infarction. Am Heart J 1983; 106: 965-73.    &nbsp; </font></p>     ]]></body>
<body><![CDATA[<!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="6"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#60.">6</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Ratcliffe AT, Pepper C.</b> Thrombolysis or primary angioplasty? Reperfusion therapy for myocardial infarction in the UK. Postgrad Med J 2008; 84(988): 73-7.    &nbsp; </font></p>     <p align="left"><font face="Verdana" size="2"><a  name="7"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#7.">7</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Grines CL.</b> Should thrombolysis or primary angioplasty be the treatment of choice for acute myocardial infarction? Primary angioplasty&mdash;the strategy of choice. N Engl J Med 1996; 335(17): 1313-6; discussion 1316-7.&nbsp; </font></p>     <!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="8"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#8.">8</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;<b>Meijer A, Verheugt FW, Werter CJ, Lie KI, van der Pol JM, van Eenige MJ</b>. Aspirin versus coumadin in the prevention of reocclusion and recurrent ischemia after successful thrombolysis: a prospective placebo-controlled angiographic study. Results of the APRICOT Study. Circulation 1993; 87(5): 1524-30.    &nbsp; </font></p>     <!-- ref --><p align="left"><font face="Verdana" size="2"><a  name="9"></a> </font><font color="#1f1a17" face="Verdana" size="2"> <a href="#9.">9</a></font><font face="Verdana" size="2">.&nbsp;&nbsp;&nbsp;&nbsp;The effects of tissue plasminogen activator, streptokinase, or both on coronary-artery patency, ventricular function, and survival after acute myocardial infarction. 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