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<front>
<journal-meta>
<journal-id>1409-4142</journal-id>
<journal-title><![CDATA[Revista Costarricense de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. costarric. cardiol]]></abbrev-journal-title>
<issn>1409-4142</issn>
<publisher>
<publisher-name><![CDATA[Asociación Costarricense de Cardiología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1409-41422000000300008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Manejo actual del síndrome coronario agudo, primera parte: infarto del miocardio con onda Q]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Obón Arellano]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Cima  ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2000</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2000</year>
</pub-date>
<volume>2</volume>
<numero>3</numero>
<fpage>44</fpage>
<lpage>67</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1409-41422000000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1409-41422000000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1409-41422000000300008&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[  &nbsp;     <br> <b><font face="Arial">REVISI&Oacute;N</font></b>     <center><b><font face="ARIAL"><font color="#000000">Manejo actual del s&iacute;ndrome coronario agudo</font></font></b></center>     <center><b><font face="ARIAL"><font color="#000000">Primera parte: infarto del miocardio con onda Q.</font></font></b></center>     <center><b><font face="ARIAL"><font color="#000000">&nbsp;</font></font></b></center>     <center><a name="*a"></a><b><font face="ARIAL"><font size="-1"><a  href="#*">*</a>Dr. Alfonso Ob&oacute;n Arellano</font></font></b></center> &nbsp;     <br> &nbsp;     <p><b><font face="arial"><font size="-1">Introducci&oacute;n</font></font></b> </p>     <p><font face="arial"><font size="-1">Cada a&ntilde;o aproximadamente 800.000 personas en los Estados Unidos presentan un infarto agudo del miocardio de las cuales 213.000 fallecen (<a href="#1%29">1</a>). La mayor&iacute;a de estas muertes ocurren en la primera hora del infarto, y antes de que el paciente se presente al servicio de emergencias (<a href="#2%29">2</a>). Una vez que el paciente recibe atenci&oacute;n m&eacute;dica la mortalidad intrahospitalaria es de un 10%. Otro porcentaje igual muere en el primer a&ntilde;o despu&eacute;s del infarto.</font></font> </p>     <p><font face="arial"><font size="-1">En las &uacute;ltimas tres d&eacute;cadas se ha observado una marcada disminuci&oacute;n de la mortalidad en pacientes con enfermedad coronaria. Posiblemente se deba a una mejor educaci&oacute;n, a la modificaci&oacute;n de los factores de riesgo coronario y mejoras en el manejo de los S&iacute;ndromes Coronarios Agudos donde la trombol&iacute;sis y la angioplast&iacute;a han contribuido significativamente.</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">Fisiopatolog&iacute;a: El infarto del miocardio se define como la necrosis del tejido card&iacute;aco debido a una isquemia prolongada que lleva al reemplazo del miocardio por una cicatriz de tejido fibr&oacute;tico. Generalmente ocurre por una oclusi&oacute;n tromb&oacute;tica s&uacute;bita de una arteria coronaria. Esta se produce sobre una placa ateroscler&oacute;tica que se vuelve inestable por un proceso de ulceraci&oacute;n, fisura y ruptura(<a href="#3%29">3</a>,<a  href="#4%29">4</a>,<a href="#5%29">5</a>) La vulnerabilidad de la placa y la trombogenicidad son factores que han adquirido m&aacute;s importancia que el tama&ntilde;o de la placa o la severidad de la estenosis (<a href="#6%29">6</a>,<a href="#7%29">7</a>).Revisiones extensas o meta-an&aacute;lisis de la literatura(<a href="#8%29">8</a>) han mostrado: El 68% de los infartos ocurren en lesiones con estenosis menores del 50%; 18% con lesiones entre 50 a 70%, solamente el 14% de los infartos con lesiones mayores del 70%. Las manifestaciones cl&iacute;nicas que se presentan en el infarto agudo del miocardio depender&aacute;n de la vulnerabilidad de la placa y del tama&ntilde;o del trombo. Es as&iacute;, que trombos que ocluyen completamente la luz arterial y con una pobre circulaci&oacute;n colateral provocar&aacute;n un infarto del miocardio con onda Q. Cuando el trombo no ocluye completamente la luz arterial se presentar&aacute; como angina inestable o infarto no Q(<a href="#9%29">9</a>).</font></font>     <br> &nbsp; </p>     <center><font face="Arial,Helvetica"><font size="-1">&nbsp;<img  src="/img/fbpe/rcc/v2n3/0498i1.JPG" title="" alt=""  style="width: 600px; height: 261px;"></font></font></center> &nbsp;     
<br> &nbsp;     <br> <font face="arial"><font size="-1">El conocimiento m&aacute;s profundo de la fisiopatolog&iacute;a de la enfermedad coronaria ha llevado a un cambio en la nomenclatura de las consecuencias de la enfermedad coronaria. Se denominan como S&iacute;ndrome Coronario Agudo a la Angina Inestable, el Infarto no Q, y el Infarto Q.</font></font>     <br> &nbsp;     <center><img src="/img/fbpe/rcc/v2n3/0498i7.GIF" border="0"  height="316" width="422"></center>     
<p><font face="arial"><font size="-1">Antman EM,Braunwald E,Acute Myocardial Infarction.In Braunwald EB,Editor.Heart Disease: A texbook of Cardiovascular Medicine,1996,Philadelphia,PA: WB Saundres.</font></font>     <br> <font size="-1">&nbsp;</font>     <br> <b><font face="arial"><font size="-1">Diagn&oacute;stico:</font></font></b> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">El criterio de la Organizaci&oacute;n Mundial de la Salud para el diagn&oacute;stico del infarto del miocardio se basa en la presencia de por lo menos dos de los tres criterios diagn&oacute;sticos:</font></font> </p>     <p><font face="arial"><font size="-1">- Historia de dolor tor&aacute;cico con caracter&iacute;sticas de isquemia mioc&aacute;rdica.</font></font> </p>     <p><font face="arial"><font size="-1">- Cambios evolutivos electrocardiogr&aacute;ficos en trazos seriados.</font></font> </p>     <p><font face="arial"><font size="-1">- Elevaci&oacute;n y ca&iacute;da de marcadores de da&ntilde;o mioc&aacute;rdico en el suero.</font></font>     <br> &nbsp;     <br> <b><font face="arial"><font size="-1">Presentaci&oacute;n Cl&iacute;nica:</font></font></b> </p>     <p><font face="arial"><font size="-1">La historia cl&iacute;nica contin&uacute;a siendo el elemento m&aacute;s importante en la evaluaci&oacute;n inicial.</font></font> </p>     <p><font face="arial"><font size="-1"><u>S&iacute;ntomas T&iacute;picos:</u> Se presentan en 70 a 80% de los pacientes con IAM. La manifestaci&oacute;n m&aacute;s frecuente es el dolor tor&aacute;cico. Es una opresi&oacute;n retroesternal con irradiaci&oacute;n al hombro y brazo izquierdo. Pudi&eacute;ndose irradiar a cuello, mand&iacute;bula, hombro y brazo derecho y al abd&oacute;men. S&iacute;ntomas que se asocian com&uacute;nmente son sudoraci&oacute;n, palidez, n&aacute;usea, v&oacute;mito, debilidad, s&iacute;ncope y sensaci&oacute;n de muerte inminente. Pr&oacute;dromos de horas o d&iacute;as se presentan en aproximadamente un 50% de los pacientes.</font></font> </p>     <p><font face="arial"><font size="-1"><u>S&iacute;ntomas At&iacute;picos:</u> los m&aacute;s frecuentes cuando no hay dolor tor&aacute;cico son disnea y dolor abdominal. Tambi&eacute;n se presentan manifestaciones de insuficiencia card&iacute;aca reciente o deterioro de una insuficiencia cr&oacute;nica con o sin edema agudo pulmonar. Otra presentaci&oacute;n son arritmias, s&iacute;ncope o accidente vascular cerebral emb&oacute;lico. Aproximadamente del 25 a 35% son infartos silenciosos, especialmente en pacientes diab&eacute;-ticos,mayores de 70 a&ntilde;os y en pacientes recientemente operados cuando a&uacute;n est&aacute;n bajo efectos de sedaci&oacute;n.</font></font> </p>     <p><font face="arial"><font size="-1">En el Registro Nacional del Infarto del Miocardio de los E.U.A. un 33% de los pacientes con IAM no presentaron dolor tor&aacute;cico, por lo general eran mayores, mujeres y diab&eacute;ticos. Tardaban mayor tiempo en solicitar ayuda m&eacute;dica y por lo tanto en recibir tratamiento apropiado. Su mortalidad intrahospitalaria era del 23.3% en comparaci&oacute;n con los pacientes que refer&iacute;an dolor, la cual era de 9.3%(<a href="#10%29">10</a>).</font></font> </p>     ]]></body>
<body><![CDATA[<p></p> <hr size="4" noshade="noshade" width="80%">    <br> <font face="arial"><font size="-1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S&iacute;ntomas at&iacute;picos en el IAM.</font></font>     <br> &nbsp;     <center> <table border="0" cellspacing="0" cellpadding="0" width="80%">   <tbody>     <tr>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">S&iacute;ntomas</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">65-74 a&ntilde;os&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">75-84 a&ntilde;os&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">&gt; 85 a&ntilde;os&nbsp;</font></font></td>     </tr>     <tr>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">Dolor tor&aacute;cico&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">78%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">60%</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">38%</font></font></td>     </tr>     <tr>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">Disnea&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">41%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">44%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">43%</font></font></td>     </tr>     <tr>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">Sudoraci&oacute;n&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">34%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">23%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">14%</font></font></td>     </tr>     <tr>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">S&iacute;ncope</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">3%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">18%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">18%</font></font></td>     </tr>     <tr>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">Confusi&oacute;n</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">3%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">8%&nbsp;</font></font></td>       <td width="15%"><font face="Arial,Helvetica"><font size="-1">7%</font></font></td>     </tr>   </tbody> </table> </center> <hr size="4" noshade="noshade" width="80%">     <p><font face="arial"><font size="-1">Reeder GS, Gersh BJ Acute Myocardial Infarction. Steins Internal Medicine 1994:169-89(<a href="#11%29">11</a>).</font></font>     <br> &nbsp; </p>     <p><font face="arial"><font size="-1"><b>Ex&aacute;men F&iacute;sico:</b> Rara vez es diagn&oacute;stico por s&iacute; mismo. Puede ser de un ex&aacute;men pr&aacute;cticamente normal hasta un ex&aacute;men severamente alterado. Killip y Kimbal(<a href="#12%29">12</a>) demostraron que con el ex&aacute;men f&iacute;sico se puede establecer el pron&oacute;stico inmediato del paciente:</font></font>     <br> &nbsp;     <br> &nbsp; </p>     <center> <table border="0" cellspacing="0" cellpadding="0" width="80%">   <tbody>     <tr>       <td width="20%"><b><font face="arial"><font size="-1">Killip</font></font></b></td>       <td width="20%"><font size="-1"><font face="Arial,Helvetica">&nbsp;</font><b><font  face="arial">Caracter&iacute;sticas Cl&iacute;nicas</font></b></font></td>       <td width="20%"><b><font face="arial"><font size="-1">Porcentaje de pacientes</font></font></b></td>       <td width="20%"><b><font face="arial"><font size="-1">Mortalidad</font></font></b></td>     </tr>     <tr>       <td><font face="Arial,Helvetica"><font size="-1">1</font></font></td>       <td><font face="Arial,Helvetica"><font size="-1">Sin insuficiencia card&iacute;aca</font></font></td>       <td><font face="Arial,Helvetica"><font size="-1">40-50%&nbsp;</font></font></td>       <td><font face="Arial,Helvetica"><font size="-1">6%</font></font></td>     </tr>     <tr>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">2&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">Galope, estertores basales&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">30-40%&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">17%</font></font></td>     </tr>     <tr>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">3&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">Edema agudo pulm&oacute;n&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">10-15%&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">38%</font></font></td>     </tr>     <tr>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">4&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">Shock Cardiog&eacute;nico</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">5 -10%&nbsp;</font></font></td>       <td width="20%"><font face="Arial,Helvetica"><font size="-1">81%&nbsp;</font></font></td>     </tr>   </tbody> </table> </center> &nbsp;     ]]></body>
<body><![CDATA[<center><b><font face="arial"><font size="-1">Diagn&oacute;stico diferencial:</font></font></b></center> &nbsp;     <br> &nbsp;     <center> <table border="0" width="60%">   <tbody>     <tr>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">1) Disecci&oacute;n a&oacute;rtica.</font></font></td>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">6) Costocondritis.</font></font></td>     </tr>     <tr>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">2) Pericarditis.&nbsp;</font></font></td>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">7) Esofagitis.</font></font></td>     </tr>     <tr>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">3) Miocarditis.</font></font></td>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">8) Ulcera P&eacute;ptica.&nbsp;</font></font></td>     </tr>     <tr>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">4) Embolismo Pulmonar Agudo.</font></font></td>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">9) Pancreatitis.</font></font></td>     </tr>     <tr>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">5) Neuralgia Intercostal.&nbsp;</font></font></td>       <td width="30%"><font face="Arial,Helvetica"><font size="-1">10) Colelitiasis.</font></font></td>     </tr>   </tbody> </table> </center> &nbsp;     <p><font face="arial"><font size="-1"><b>Electrocardiograma:</b> Contin&uacute;a siendo por s&iacute; solo en la valoraci&oacute;n inicial el ex&aacute;men m&aacute;s &uacute;til para el diagn&oacute;stico del IAM(<a  href="#13%29">13</a>). Sin embargo hay varios factores que limitan la interpretaci&oacute;n del electrocardiograma para el diagn&oacute;stico y localizaci&oacute;n del infarto:</font></font> </p> <dd><font face="arial"><font size="-1">1) El grado de la evoluci&oacute;n de la lesi&oacute;n mioc&aacute;rdica.</font></font></dd> <dd>   <font face="arial"><font size="-1">2) La edad del infarto.</font></font></dd> <dd>   <font face="arial"><font size="-1">3) Localizaci&oacute;n en la regi&oacute;n postero lateral del VI.</font></font></dd> <dd>   <font face="arial"><font size="-1">4) Presencia de defectos de conducci&oacute;n.</font></font></dd> <dd>   <font face="arial"><font size="-1">5) Presencia de infartos previos.</font></font></dd> <dd>   <font face="arial"><font size="-1">6) Pericarditis Aguda.</font></font></dd> <dd>   <font face="arial"><font size="-1">7) Ateraciones electrol&iacute;ticas.</font></font></dd> <dd>   <font face="arial"><font size="-1">8) Drogas cardioactivas.</font></font></dd>     <br> &nbsp;     <br> <u><font face="arial"><font size="-1">Condiciones que pueden simular el patr&oacute;n electrocardiogr&aacute;fico de un IAM, el denominado pseudoinfarto (<a href="#14%29">14</a>):</font></font></u>     <br> &nbsp; <dd><font face="arial"><font size="-1">1) Hipertrofia del Ventr&iacute;culo Izquierdo.</font></font></dd> <dd>   <font face="arial"><font size="-1">2) Trastornos en la conducci&oacute;n el&eacute;ctrica.</font></font></dd> <dd>   <font face="arial"><font size="-1">3) S&iacute;ndromes de Pre-excitaci&oacute;n.</font></font></dd> <dd>   <font face="arial"><font size="-1">5) Embolia Pulmonar.</font></font></dd> <dd>   <font face="arial"><font size="-1">6) Tumores Primarios y met&aacute;stasicos del coraz&oacute;n.</font></font></dd> <dd>   <font face="arial"><font size="-1">7) Trauma Mioc&aacute;rdico.</font></font></dd> <dd>   <font face="arial"><font size="-1">8) Hemorragia Intracraneana.</font></font></dd> <dd>   <font face="arial"><font size="-1">9) Hiperkalemia.</font></font></dd> <dd>   <font face="arial"><font size="-1">10) Pericarditis.</font></font></dd> <dd>   <font face="arial"><font size="-1">11) Repolarizaci&oacute;n temprana.</font></font></dd> <dd>   <font face="arial"><font size="-1">12) Sarcoidosis o Amiloidosis card&iacute;aca.</font></font></dd>     <br> &nbsp;     <br> <u><font face="arial"><font size="-1">Patr&oacute;n Electrocardiogr&aacute;fico del IAM:</font></font></u>     <p><font face="arial"><font size="-1">- El patr&oacute;n cl&aacute;sico de lesi&oacute;n transmural con elevaci&oacute;n del segmento ST, con cambios en la onda T y el desarrollo posterior de ondas Q se presenta en aproximadamente el 50% de los pacientes (<a href="#15%29">15</a>-<a href="#16%29">16</a>).</font></font>     ]]></body>
<body><![CDATA[<br> <font face="arial"><font size="-1">-&nbsp; Bloqueo de rama reciente.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; Depresi&oacute;n del segmento ST o inversi&oacute;n de la onda T.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; Cambios no espec&iacute;ficos.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; Elevaci&oacute;n ST en V3R-V6R en el infarto del ventr&iacute;culo derecho.</font></font>     <br> &nbsp; </p>     <p><font face="arial"><font size="-1"><u>Isquemia a Distancia:</u> Es una condici&oacute;n que se presenta en electrocardiogramas de pacientes que tienen ondas Q recientes, con elevaci&oacute;n del segmento ST diagn&oacute;sticas de IM en evoluci&oacute;n y depresi&oacute;n del segmento ST en otro territorio. Estos cambios adicionales pueden ser provocados por isquemia en otro sitio del infarto o por un fen&oacute;meno el&eacute;ctrico rec&iacute;proco. Este fen&oacute;meno llamado isquemia a distancia es un factor de mal pron&oacute;stico ya que lleva a un riesgo m&aacute;s elevado de complicaciones futuras (<a  href="#17%29">17</a>).</font></font> </p>     <p><font face="arial"><font size="-1">La mayor&iacute;a de los pacientes que desarrollan ondas Q durante un IAM las continuar&aacute;n presentando en los electrocardiogramas. Hay un peque&ntilde;o grupo de pacientes en que estas desaparecen del trazo electrocardi&oacute;grafico (<a  href="#18%29">18</a>).</font></font>     <br> &nbsp;     <br> <b><font face="arial"><font size="-1">Marcadores Bioqu&iacute;micos de da&ntilde;o Mioc&aacute;rdico.</font></font></b> </p>     <p><font face="arial"><font size="-1">Cuando se necrozan las c&eacute;lulas del tejido mioc&aacute;rdico pierden la integridad de la membrana celular y las macromol&eacute;culas intracelulares difunden hacia la micro- circulaci&oacute;n y a los linf&aacute;ticos. Eventualmente estas macro mol&eacute;culas se detectan en la circulaci&oacute;n perif&eacute;rica y constituyen los marcadores bioqu&iacute;micos que nos permiten el diagn&oacute;stico y cuantificaci&oacute;n del IAM. Nuevos marcadores de da&ntilde;o mioc&aacute;rdico como las sub- formas de la CK-MB, las Troponinas I y T, la mioglobina han adquirido gran popularidad (<a href="#19%29">19</a>).</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">Elevaciones seriadas de la Creatin-fosfokinasa y de la fracci&oacute;n MB han sido utilizadas para el diagn&oacute;stico del Infarto durante muchos a&ntilde;os.</font></font> </p>     <p><font face="arial"><font size="-1">La CK-MB existe en una sola forma en el tejido mioc&aacute;rdico pero en diferentes sub-formas en el plasma. Una es CK-MB1 (Plasma) y CK-MB2(tisular). En las primeras 6 horas de la evoluci&oacute;n de un infarto, un nivel absoluto de CK-MB2 &gt; 1.0 U/lt y una relaci&oacute;n de CK-MB2 a CK-MB1 &gt; 1.5 es m&aacute;s sensible y espec&iacute;fica para el diagn&oacute;stico de IAM que la CK-MB. (<a  href="#20%29">20</a>,<a href="#21%29">21</a>).</font></font> </p>     <p><font face="arial"><font size="-1">El complejo de las Troponinas consiste de tres sub- unidades: Troponina T, Troponina I y Troponina C. Ambas troponinas TnT y TnI est&aacute;n presentes en el m&uacute;sculo esquel&eacute;tico y card&iacute;aco, sin embargo por tener diferentes genes y secuencia de amino&aacute;cidos producen anticuerpos diferentes que permiten ser detectados independientemente. Varios estudios han demostrado su utilidad en el diagn&oacute;stico y pron&oacute;stico de los S&iacute;ndromes Coronarios Agudos. Dado que la troponina I es muy sensible para la detecci&oacute;n temprana de lesi&oacute;n mioc&aacute;rdica se utiliza para evaluar pacientes con el S&iacute;ndrome de Dolor Tor&aacute;cico Agudo(<a href="#22%29">22</a>,<a href="#23%29">23</a>,<a  href="#24%29">24</a>). Los pacientes que no presentan elevaci&oacute;n del segmento ST durante el per&iacute;odo de dolor y teniendo dos muestras de TnI negativas (por lo menos 6 hrs despu&eacute;s del inicio del dolor) tienen un riesgo muy leve de IM o muerte (0.3%) y pueden ser externados del servicio de observaci&oacute;n. La elevaci&oacute;n de las Troponinas card&iacute;acas en los S&iacute;ndromes Coronarios Agudos ha llevado al Dr Braunwald ha modificar la clasificaci&oacute;n de angina propuesta por &eacute;l en 1989. Publicada recientemente en Circulation en Julio de este a&ntilde;o (<a href="#25%29">25</a>) propone dividir a la angina en reposo con menos de 48 hrs de evoluci&oacute;n Clase 3B en un grupoTnT positiva y otro TnT negativo. El riesgo de infarto o muerte en el primer grupo es entre 15-20% comparado con el segundo que es de menos del 2%.</font></font> </p>     <p><font face="arial"><font size="-1">Las mioglobinas se elevan muy tempranamente en el IAM pero no son espec&iacute;ficas para m&uacute;sculo card&iacute;aco y se pueden encontrar elevadas cuando hay da&ntilde;o en el m&uacute;sculo esquel&eacute;tico.</font></font>     <br> &nbsp; </p>     <center><img src="/img/fbpe/rcc/v2n3/0498i8.JPG" height="301"  width="432"></center> &nbsp;     
<br> &nbsp;     <br> <b><font face="arial"><font size="-1">Valoraci&oacute;n inicial del Tama&ntilde;o del Infarto.</font></font></b>     <p><font face="arial"><font size="-1">Actualmente la Ecocardiograf&iacute;a es la t&eacute;cnica m&aacute;s frecuentemente utilizada en los hospitales para valorar el tama&ntilde;o del infarto. Puede mostrar la extensi&oacute;n y localizaci&oacute;n de las anormalidades de la contracci&oacute;n segmentaria, la funci&oacute;n ventricular y la presencia de trombos, as&iacute; mismo puede identificar complicaciones mec&aacute;nicas del IAM. No puede distinguir las alteraciones segmentarias de la motilidad parietal agudas de las antiguas.</font></font> </p>     <p><font face="arial"><font size="-1">El uso de perfusi&oacute;n por medio de is&oacute;topos ayuda a valorar la respuesta a la reperfusi&oacute;n y la isquemia residual. Cuando la viabilidad del tejido es la duda, los estudios con Thallium con im&aacute;genes tempranas y tard&iacute;as es una excelente opci&oacute;n.</font></font>     ]]></body>
<body><![CDATA[<br> &nbsp;     <br> <b><font face="arial"><font size="-1">Tratamiento:</font></font></b> </p>     <p><font face="arial"><font size="-1">Evaluaci&oacute;n Inicial. La evaluaci&oacute;n y tratamiento inicial se deber&aacute;n realizar lo m&aacute;s r&aacute;pidamente posible. Idealmente el tiempo transcurrido entre la llegada del paciente al servicio de emergencias y la aplicaci&oacute;n del tratamiento deber&aacute; ser menos de 30 minutos.</font></font> </p>     <p><font face="arial"><font size="-1">Una historia y ex&aacute;men f&iacute;sico breves, electrocardiograma y la toma de marcadores bioqu&iacute;micos deber&aacute; realizarse de inmediato. El riesgo de muerte s&uacute;bita es mayor en esta etapa inicial. Los objetivos del tratamiento son: la limitaci&oacute;n del tama&ntilde;o del infarto con medidas de reperfusi&oacute;n, detecci&oacute;n temprana y tratamiento de arritmias complejas, prevenci&oacute;n de insuficiencia card&iacute;aca y de isquemia recurrente. Otras medidas estar&aacute;n orientadas al confort del paciente, reducir complicaciones y facilitar una recuperaci&oacute;n y rehabilitaci&oacute;n adecuada.</font></font>     <br> &nbsp; </p>     <div style="text-align: center;"><img  src="/img/fbpe/rcc/v2n3/0498i2.JPG" title="" alt=""  style="width: 580px; height: 574px;">&nbsp;     
<br> </div> &nbsp;     <br> <b><font face="arial"><font size="-1">Medidas Generales de Rutina:</font></font></b>     <p><font face="arial"><font size="-1"><b>Ox&iacute;geno: </b>Se ha establecido como pr&aacute;ctica universal la aplicaci&oacute;n de ox&iacute;geno por c&aacute;nula nasal en todos los pacientes con sospecha de presentar un S&iacute;ndrome Coronario Agudo.</font></font> </p>     <p><font face="arial"><font size="-1">Estudios experimentales muestran que la administraci&oacute;n de ox&iacute;geno puede limitar el da&ntilde;o isqu&eacute;mico(<a href="#27%29">27</a>) y hay evidencia que el ox&iacute;geno disminuye la elevaci&oacute;n del segmento ST en el IAM (<a  href="#28%29">28</a>). Se administra de 2-4 lts por minuto, especialmente en pacientes con congesti&oacute;n pulmonar y con saturaciones menores del 90%. En infartos no complicados puede administrarse solamente en las primeras horas de evoluci&oacute;n.</font></font> </p>     ]]></body>
<body><![CDATA[<p><b><font face="arial"><font size="-1">Aspirina (<a href="#29">29</a>):</font></font></b><font  face="arial"><font size="-1"> Forma parte integral del tratamiento del S&iacute;ndrome Coronario Agudo. Act&uacute;a bloqueando r&aacute;pidamente la formaci&oacute;n de Tromboxano A2 en las plaquetas por la inhibici&oacute;n de la ciclo-oxigenasa. Las plaquetas pierden la capacidad de generar nueva ciclo-oxigenasa durando esta inhibici&oacute;n enzim&aacute;tica toda la vida de la plaqueta, aproximadamente 10 d&iacute;as.</font></font> </p>     <p><font face="arial"><font size="-1">En el estudio ISIS-2 (<a  href="#30%29">30</a>) se demostr&oacute; que disminuye la mortalidad en el IAM en 23% por s&iacute; sola y en combinaci&oacute;n con la Streptokinasa la disminuci&oacute;n fu&eacute; a&uacute;n mayor 42%. Las dosis peque&ntilde;as de aspirina 80 mgr toman varios d&iacute;as en mostrar su efecto antiplaquetario, es por esta raz&oacute;n que se utilizan dosis de 160 a 325 mgr y para facilitar su absorci&oacute;n se disuelve en la boca. Se usa inmediatamente y se contin&uacute;a indefinidamente si no hay contraindicaciones. No se ha mostrado ning&uacute;n beneficio cuando se asocia aspirina a dosis bajas de warfarina en pacientes con IAM(<a href="#31%29">31</a>).</font></font> </p>     <p><b><font face="arial"><font size="-1">Analgesia (<a href="#32%29">32</a>):</font></font></b><font  face="arial"><font size="-1"> El Sulfato de Morfina ha sido tradicionalmente el agente m&aacute;s usado en el manejo del IAM. Se administra en bolos IV en dosis de 2-5 mgr cada 5 a 30 minutos dos a tres dosis. Algunos pacientes podr&iacute;an requerir dosis hasta de 25 a 30 mgr para lograr alivio del dolor. Se deben tomar precauciones en pacientes con EPOC severo. En el caso espor&aacute;dico que se presente depresi&oacute;n respiratoria se administrar&aacute; Naloxano a dosis de 0.4 mgr IV cada 3 minutos a un m&aacute;ximo de 3 dosis.</font></font>     <br> &nbsp;     <br> <b><u><font face="arial"><font size="-1">Medidas espec&iacute;ficas:</font></font></u></b> </p>     <p><font face="arial"><font size="-1">La reperfusi&oacute;n de la arteria infartada con trombol&iacute;sis o angioplast&iacute;a primaria es la estrategia m&aacute;s importante en el manejo del IAM. El beneficio de la reperfusi&oacute;n es dependiente del tiempo, entre m&aacute;s r&aacute;pido se restaure el flujo sangu&iacute;neo a la zona isqu&eacute;mica mayor beneficio en t&eacute;rminos de sobrevida y pron&oacute;stico(<a href="#33%29">33</a>,<a  href="#34%29">34</a>,<a href="#35%29">35</a>).</font></font> </p>     <p><font face="arial"><font size="-1"><b>Trombol&iacute;sis:</b> Los agentes fibrinol&iacute;ticos act&uacute;an como activadores directos o indirectos del plasmin&oacute;geno, lo que resulta en un cambio de la pro-enzima a su forma activa plasmina la cual cataliza la degradaci&oacute;n de fibrina o fibrin&oacute;geno y la disoluci&oacute;n del co&aacute;gulo. Los agentes fibrinol&iacute;ticos pueden ser denominados como activadores espec&iacute;ficos de la fibrina y activadores no espec&iacute;ficos. Los <u>activadores no espec&iacute;ficos</u> como la Streprokinasa, Urokinasa o Anistreptase convierten el plasmin&oacute;geno circulante y el unido al co&aacute;gulo en plasmina, resultando no solo en l&iacute;sis de la fibrina en el co&aacute;gulo sino tambi&eacute;n en fibrinogenol&iacute;sis sist&eacute;mica, fibrinogenemia y elevaci&oacute;n de los productos de degradaci&oacute;n del fibrin&oacute;geno circulantes(<a href="#36%29">36</a>). Los activadores espec&iacute;ficos por el contrario producen lisis de fibrina en la superficie del co&aacute;gulo preservando el fibrin&oacute;geno circulante. En este grupo se encuentra el activador tisular del plasmin&oacute;geno.</font></font> </p>     <p><b><font face="arial"><font size="-1">Indicaciones:</font></font></b> </p>     <p><font face="arial"><font size="-1">1) Infarto del miocardio en evoluci&oacute;n con elevaci&oacute;n del segmento ST mayor de 0.1mV en dos o m&aacute;s derivaciones contiguas, menos de 12 horas de evoluci&oacute;n y en pacientes menores de 75 a&ntilde;os.</font></font> </p>     <p><font face="arial"><font size="-1">2) S&iacute;ntomas sugestivos de IAM en presencia de bloqueo de rama reciente.</font></font>     ]]></body>
<body><![CDATA[<br> &nbsp;     <br> <b><font face="arial"><font size="-1">Contraindicaciones:</font></font></b> </p>     <p><b><font face="arial"><font size="-1">Absolutas:</font></font></b> </p>     <p><font face="arial"><font size="-1">1) Antecedente de AVC hemorr&aacute;gico en cualquier &eacute;poca de la vida, otro tipo de AVC en t&eacute;rmino de un a&ntilde;o.</font></font>     <br> <font face="arial"><font size="-1">2) Neoplasia intracraneal.</font></font>     <br> <font face="arial"><font size="-1">3) Sangrado interno activo(no incluye menstruaci&oacute;n).</font></font>     <br> <font face="arial"><font size="-1">4) Sospecha de disecci&oacute;n a&oacute;rtica.</font></font> </p>     <p><b><font face="arial"><font size="-1">Relativas:</font></font></b> </p>     <p><font face="arial"><font size="-1">1) Hipertensi&oacute;n severa &gt;180/110.</font></font>     <br> <font face="arial"><font size="-1">2) Uso de anticoagulantes en dosis terap&eacute;uticas (INR entre 2 y 3) y trastornos de la coagulaci&oacute;n.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="arial"><font size="-1">3) Historia de AVC no cubierto en contraindicaciones absolutas.</font></font>     <br> <font face="arial"><font size="-1">4) Trauma reciente ( 2 a 4 semanas) incluye trauma de cr&aacute;neo, resucitaci&oacute;n cardiopulmonar traum&aacute;tica o prolongada y cirug&iacute;a mayor (&lt; 3 semanas).</font></font>     <br> <font face="arial"><font size="-1">5) Punci&oacute;n vascular previa en sitios no compresibles.</font></font>     <br> <font face="arial"><font size="-1">6) Sangrado interno reciente(2 a 4 semanas).</font></font>     <br> <font face="arial"><font size="-1">7) Reacci&oacute;n al&eacute;rgica a aplicaci&oacute;n de Streptokinasa/Anistreptase previa.</font></font>     <br> <font face="arial"><font size="-1">8) Embarazo.</font></font>     <br> <font face="arial"><font size="-1">9) Ulcera P&eacute;ptica activa.</font></font>     <br> <font face="arial"><font size="-1">10) Historia de Hipertensi&oacute;n cr&oacute;nica severa.</font></font>     <br> &nbsp;     <br> <b><font face="arial"><font size="-1">Beneficios de la Trombol&iacute;sis:</font></font></b> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">El Grupo Italiano para el estudio de la Streptokinasa en el Infarto del Miocardio(<a href="#34%29">34</a>) fue el primer estudio que demostr&oacute; una reducci&oacute;n de la mortalidad en los pacientes tratados con Streptokinasa. An&aacute;lisis posteriores de 5 estudios grandes GISSI(<a href="#34%29">34</a>), ISAM(<a  href="#37%29">37</a>), ISSIS 2(30), AIMS(<a href="#38%29">38</a>), ASSET(<a href="#39%29">39</a>),obtuvieron una disminuci&oacute;n de la mortalidad del 27% entre 28.000 pacientes tratados en las primeras seis horas del IAM.</font></font> </p>     <p><font face="arial"><font size="-1">A pesar del enorme beneficio de la trombolisis s&oacute;lo 33% de los pacientes se consideran candidatos elegibles para este tratamiento. En el estudio TIMI-2B(<a href="#40%29">40</a>) la mortalidad intra-hospitalaria de los pacientes que recibiron t-PA fue del 2.5 % comparado con un 10 a 25% en los pacientes que fueron exclu&iacute;dos de la trombol&iacute;sis por diferentes razones.</font></font>     <br> &nbsp; </p>     <center><a name="CUADRO2"></a><img  src="/img/fbpe/rcc/v2n3/0498i3.GIF" border="0" height="231"  width="587"></center>     
<center>&nbsp;</center>     <center><a name="CUADRO3"></a><img  src="/img/fbpe/rcc/v2n3/0498i4.GIF" border="0" height="385"  width="589"></center>     
<p><font face="arial"><font size="-1">Independientemente del agente utilizado el mayor beneficio de la terapia trombol&iacute;tica se obtendr&aacute; agilizando el tiempo que transcurre entre el inicio de los s&iacute;ntomas y la aplicaci&oacute;n de la terapia; entre m&aacute;s r&aacute;pido se aplique mejores resultados se obtendr&aacute;n. (<a href="#112%29">112</a>).</font></font> </p>     <p><font face="arial"><font size="-1">Se han sugerido algunas alternativas para escoger el agente trombol&iacute;tico.&nbsp; El estudio Gusto-1 (<a  href="#48%29">48</a>), Gusto III (<a href="#49%29">49</a>) sugieren que el R&eacute;gimen acelerado de Alteplase y Reteplase con heparina intravenosa son aparentemente las terapias m&aacute;s eficientes para obtener reperfusi&oacute;n coronaria temprana, pero ambas son mucho m&aacute;s caras y tienen un riesgo un poco mayor de hemorragia intracraneana.&nbsp; Se prefiere su uso en pacientes con infartos anteriores extensos, en menores de 75 a&ntilde;os, que se presenten temprano a recibir atenci&oacute;n m&eacute;dica y que no tengan factores que predispongan a un accidente vascular cerebral.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Efectos Adversos:</font></font></b> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">La terapia trombol&iacute;tica est&aacute; asociada con un riesgo peque&ntilde;o pero definitivo de hemorragia intracraneana que ocurre predominantemente en el primer d&iacute;a de terapia (<a  href="#41%29">41</a>).</font></font> </p>     <p><font face="arial"><font size="-1">Las variables cl&iacute;nicas que muestran un mayor riesgo de hemorragia intracraneana son&nbsp; (<a href="#42%29">42</a>):</font></font> </p>     <p><font face="arial"><font size="-1">1)&nbsp; Edad mayor de 65 a&ntilde;os.</font></font>     <br> <font face="arial"><font size="-1">2)&nbsp; Bajo peso corporal.</font></font>     <br> <font face="arial"><font size="-1">3)&nbsp; Hipertensi&oacute;n diast&oacute;lica &gt; 110 mmHg.</font></font>     <br> <font face="arial"><font size="-1">4)&nbsp; Sexo femenino.</font></font>     <br> <font face="arial"><font size="-1">5)&nbsp; Uso de t-PA.</font></font> </p>     <p><font face="arial"><font size="-1">El riesgo aumenta conforme aumenta el n&uacute;mero de factores predisponentes;&nbsp; en promedio general la incidencia es de 0.75%.&nbsp; Sin ning&uacute;n factor el riesgo es de 0.26%, con un factor es de 0.96%, con dos factores 1.32% y es de 2.17% con la presencia de tres factores predisponentes (<a href="#43%29">43</a>).</font></font> </p>     <p><font face="arial"><font size="-1">Existe un riesgo temprano de muerte en las primeras 24 hrs de tratamiento de aproximadamente 5 muertes por cada 1000 pacientes tratados (<a href="#50%29">50</a>).&nbsp; Este riesgo pr&aacute;cticamente se anula al observar la sobrevida despu&eacute;s del segundo d&iacute;a de tratamiento.&nbsp; Este aumento en la mortalidad temprana se observa principalmente en pacientes mayores de 75 a&ntilde;os y en aquellos tratados despu&eacute;s de 12 hrs del inicio de los s&iacute;ntomas.</font></font>     <br> &nbsp; </p>     ]]></body>
<body><![CDATA[<p><b><font face="arial"><font size="-1">Utilizaci&oacute;n de la trombol&iacute;sis en grupos problema</font></font></b> </p>     <p><b><font face="arial"><font size="-1">Pacientes mayores de 75 a&ntilde;os.</font></font></b> </p>     <p><font face="arial"><font size="-1">Los lineamientos del Colegio Americano del Coraz&oacute;n y de la Asociaci&oacute;n Americana (<a href="#44%29">44</a>) proponen el uso de trombol&iacute;sis&nbsp; en pacientes con elevaci&oacute;n del ST mayores de 75 a&ntilde;os como clase II a (el peso de la evidencia/opini&oacute;n est&aacute; en favor de la necesidad/eficiencia del procedimiento o tratamiento).</font></font> </p>     <p><font face="arial"><font size="-1">En este sub-grupo de pacientes el riesgo de muerte por infarto es elavado con o sin tratamiento.</font></font> </p>     <p><font face="arial"><font size="-1">En un meta-An&aacute;lisis de la literatura entre 1982 y 1992 (<a href="#45%29">45</a>) en pacientes mayores de 75 a&ntilde;os la terapia trombol&iacute;tica redujo la mortalidad en 10 pacientes salvados por cada 1000 pacientes tratados mayores de 75 a&ntilde;os.</font></font> </p>     <p><font face="arial"><font size="-1">En un estudio muy reciente de este a&ntilde;o el Dr Thiemann (<a href="#46%29">46</a>) observ&oacute; que en pacientes mayores de 76 a&ntilde;os tratados con trombol&iacute;ticos el beneficio que se obten&iacute;a era poco y la mortalidad mucho m&aacute;s elevada que en grupos de menor edad, las m&aacute;s afectadas eran las mujeres.&nbsp; En un editorial de la misma revista (<a href="#47%29">47</a>) el Dr Braunwald concluye:&nbsp; algunos pacientes mayores de 75 a&ntilde;os definitivamente se benefician de la terapia trombol&iacute;tica, pero muchos se enfrentan a un mayor riesgo de hemorragia intracraneana y a otras complicaciones incapacitantes o fatales.&nbsp; Los m&eacute;dicos debemos reconocer que la edad per-se no es la que provoca la evoluci&oacute;n positiva o&nbsp; negativa de la terapia trombol&iacute;tica, sino que es un marcador de patolog&iacute;a y de enfermedades co-m&oacute;rbidas&nbsp; asociadas que pueden influenciar el resultado del tratamiento.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Presentaci&oacute;n tard&iacute;a.</font></font></b> </p>     <p><font face="arial"><font size="-1">Tiempo transcurrido mayor de 12 horas de evoluci&oacute;n.</font></font> </p>     <p><font face="arial"><font size="-1">Corresponde en los lineamientos a clase II b (La necesidad/eficiencia del procedimiento o tratamiento est&aacute; menos establecida por la evidencia/opini&oacute;n).&nbsp; Generalmente se obtiene poco beneficio con la terrapia trombol&iacute;tica en pacientes con m&aacute;s de 12 hrs de evoluci&oacute;n.</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">Se debe considerar el tratamiento para aquellos pacientes con dolor persistente y con elevaci&oacute;n del ST que no tengan contraindicaciones absolutas para la trombol&iacute;sis.&nbsp; Otras medidas de reperfusi&oacute;n se deben considerar.</font></font>     <br> &nbsp;     <br> &nbsp;     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Presi&oacute;n Arterial Mayor de 180/110.</font></font></b> </p>     <p><font face="arial"><font size="-1">Clase II b.&nbsp; El riesgo de hemorragia intracraneana es mauor cuando el paciente presenta hipertensi&oacute;n severa.&nbsp; Se sugiere controlar la presi&oacute;n arterial inicialmente con nitratos, beta bloqueadores, etc para normalizarla.&nbsp; Estas maniobras ayudan pero no reducen el riesgo.&nbsp; M&aacute;s recomendado ser&iacute;a el uso de angioplast&iacute;a primaria como m&eacute;todo de reperfusi&oacute;n.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Angioplast&iacute;a Coronaria Primaria.</font></font></b> </p>     <p><font face="arial"><font size="-1">La Angioplast&iacute;a coronaria desarrollada por Andreas Gruentzig y aplicada por primera vez en 1977 abri&oacute; el camino de la cardiolog&iacute;a intervencionista y su uso en el IAM (<a  href="#51%29">51</a>).&nbsp; La restauraci&oacute;n r&aacute;pida y completa del flujo arterial y el tratamiento definitivo de la lesi&oacute;n a trav&eacute;s de la angioplast&iacute;a primaria la ha colocado como una excelente alternativa a la trombol&iacute;sis.</font></font> </p>     <p><font face="arial"><font size="-1">El t&eacute;rmino Angioplat&iacute;a Coronaria Primaria se aplica a la realizaci&oacute;n de la angioplast&iacute;a en el IAM sin el uso previo de agentes trombol&iacute;ticos.</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">La mayor&iacute;a, pero no todos los estudios cl&iacute;nicos randomizados sugieren que los pacientes tratados extiosamente con angioplast&iacute;a&nbsp; primaria tienen una menor incidencia de isquemia recurrente, reinfarto y muerte que los pacientes tratados con agentes trombol&iacute;ticos (<a href="#52%29">52</a>,<a href="#53%29">53</a>,<a  href="#54%29">54</a>).&nbsp; Los investigadores del estudio Gusto IIb (<a href="#55%29">55</a>) compararon&nbsp; el uso de un R&eacute;gimen acelerado de t-PA con angioplast&iacute;a&nbsp; primaria y demostraron una tendencia favorable a la angioplast&iacute;a pero no fue estad&iacute;sticamente significativa.&nbsp; El estudio MITI (<a href="#56%29">56</a>) con 3.145 pacientes estudiados no report&oacute; ning&uacute;n beneficio en la mortalidad cuando compararon angioplast&iacute;a primaria con la terapia trombol&iacute;tica.</font></font> </p>     <p><font face="arial"><font size="-1">Debido a los an&aacute;lisis de 10 estudios randomizados realizados por el Dr Weaver (<a href="#57%29">57</a>) comparando &eacute;stas dos modalidades de tratamiento es que la mayor&iacute;a de los cardi&oacute;logos en los EU consideran&nbsp; actualmente a la angioplast&iacute;a promaria como la terapia m&aacute;s efectiva para la reperfusi&oacute;n coronaria en el manejo del IAM.</font></font> </p>     <p><u><font face="arial"><font size="-1">La indicaci&oacute;n m&aacute;s clara, Clase I (aquella condici&oacute;n en las cuales hay evidencia y/o acuerdo general que un procedimiento o tratamiento es&nbsp; beneficioso, necesario y efectivo) para la angioplast&iacute;a primaria es:</font></font></u> </p>     <p><font face="arial"><font size="-1">1)&nbsp; Como alternativa a la terapia trombol&iacute;tica en pacientes con IAM con elevaci&oacute;n del ST o con bloqueo de rama izquierda reciente.&nbsp; A quienes se les pueda realizar la angioplast&iacute;a de la arteria infartada dentro de las 12 hrs del inicio del los s&iacute;ntomas o mayor de &eacute;ste lapso si los s&iacute;ntomas isqu&eacute;micos persisten.&nbsp; Tiene que ser realizada en un tiempo prudente, por personas experimentadas en el procedimiento y en un&nbsp; laboratorio con personal&nbsp; entrenado.</font></font> </p>     <p><font face="arial"><font size="-1">2)&nbsp; Pacientes que se encuentran dentro de las 36 hrs de haber desarrollado una elevaci&oacute;n del ST/onda Q que presentan Shock Cardi&oacute;genico, son mayores de 75 a&ntilde;os y la revascularizaci&oacute;n puede realizarse dentro de las 18 hrs del inicio del Shock.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Angioplast&iacute;a de Rescate:</font></font></b> </p>     <p><font face="arial"><font size="-1">Se refiere el t&eacute;rmino al uso de la angioplast&iacute;a luego del fracaso de la trombol&iacute;sis.</font></font> </p>     <p><font face="arial"><font size="-1">En general la angioplast&iacute;a no est&aacute; indicada en aquellos pacientes con reperfusi&oacute;n exitosa por trombol&iacute;sis a menos que haya evidencia de isquemia recurrente.&nbsp; Estas recomendaciones son tomadas del Estudio Coperativo Europeo, Trombol&iacute;sis y Angioplast&iacute;a en el infarto del Miocardio (TAMI) (<a  href="#58%29">58</a>) y dek TIMI -II (<a href="#59%29">59</a>).</font></font> </p>     <p><font face="arial"><font size="-1">El estudio RESCUE (<a  href="#60%29">60</a>) compar&oacute; angioplast&iacute;a de rescate contra la terapia coservadora&nbsp; en pacientes en los cuales fracas&oacute; la tromboleisis con IAM anterior.&nbsp; Se realiz&oacute; la angioplast&iacute;a exitosamente en 92% pero no se obtuvo una diferencia en la mortalidad, fracci&oacute;n de eyecci&oacute;n o insuficiencia card&iacute;aca a los 30 d&iacute;as de an&aacute;lisis.&nbsp; Cuando se consider&oacute; la combinaci&oacute;n de muerte y de insuficiencia card&iacute;aca, si se observ&oacute; una mayor ventaja de la angioplast&iacute;a de rescate.</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">Se ha sugerido que la angioplast&iacute;a de rescate es m&aacute;s exitosa en la arteria descendente anterior que en la coronaria derecha.&nbsp; Estudios multic&eacute;ntricos (<a  href="#61%29">61</a>) han encontrado mayores complicaciones, especialmente Fibrilaci&oacute;n Ventricular, Bloqueos y reoclusi&oacute;n en la angioplast&iacute;a de rescate en la oclusi&oacute;n de la arteria coronaria derecha.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Uso de Stents en la Angioplast&iacute;a Primaria.</font></font></b> </p>     <p><font face="arial"><font size="-1">La angioplast&iacute;a primaria es un m&eacute;todo muy valioso de reperfusi&oacute;n que resulta en una menor mortalidad, menos recurrencia de infarto y de accidente vascular cerebral comparado con la trombol&iacute;sis.&nbsp; Sin embargo la isquemia recurrente se presenta en el 15% de los pacientes exitosamente tratados y un 40-50% de reestenosis en los primeros 6 meses.&nbsp; La colocaci&oacute;n del Stent coronario ya no est&aacute; contraindicada&nbsp; en lesiones que presenten trombos y disminuye notablemente las limitaciones de la angioplast&iacute;a.</font></font> </p>     <p><font face="arial"><font size="-1">Varios estudios entre ellos el estudio de Amsterdam&nbsp; (<a href="#62%29">62</a>), PAMI stent pilot trial (<a  href="#63%29">63</a>) FRESCO (<a href="#64%29">64</a>) Y Stentim-2 (<a href="#65%29">65</a>), han demostrado una menor incidencia de isquemia recurrente y un menor grado de reestenosis&nbsp; o de reoclusi&oacute;n en la arteria infartada con el uso de los Stent coronarios.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Comparaci&oacute;n entre la Trombol&iacute;sis y la Angioplast&iacute;a Coronaria Primaria.</font></font></b> </p>     <p><u><font face="arial"><font size="-1">Terapia Trombol&iacute;tica.</font></font></u> </p>     <p><font face="arial"><font size="-1">-Ventajas:</font></font>     <br> <font face="arial"><font size="-1">1)&nbsp; Disponible universalmente, no hay necesidad de laboratorio de cateterismo.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="arial"><font size="-1">2)&nbsp; Inicio del tratamiento r&aacute;pido.</font></font>     <br> <font face="arial"><font size="-1">3)&nbsp; Puede ser administrado por personal de enfermer&iacute;a entrenado.</font></font>     <br> <font face="arial"><font size="-1">4)&nbsp; Trata el problema agudo, disoluci&oacute;n del co&aacute;gulo.</font></font>     <br> <font face="arial"><font size="-1">5)&nbsp; Disminuye la mortalidad significativamente.</font></font> </p>     <p><font face="arial"><font size="-1">-Desventajas:</font></font>     <br> <font face="arial"><font size="-1">1)&nbsp; Se utiliza solamente en 30 35% de los pacientes con IAM.</font></font>     <br> <font face="arial"><font size="-1">2)&nbsp; Uso limitado en estados de inestabilidad.</font></font>     <br> <font face="arial"><font size="-1">3)&nbsp; Leve incremento de la posibilidad de hemorragia intra-craneana.</font></font>     <br> <font face="arial"><font size="-1">4)&nbsp; Permeabilidad coronaria temprana 55-85%.</font></font>     <br> <font face="arial"><font size="-1">5)&nbsp; Flujo TIMI 3 s&oacute;lo en el 50%.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="arial"><font size="-1">6)&nbsp; No modiffica la estenosis residual.</font></font>     <br> <font face="arial"><font size="-1">7)&nbsp; Valoraci&oacute;n de la permeabilidad de la arteria requiere estudios adicionales.</font></font> </p>     <p><u><font face="arial"><font size="-1">Angioplast&iacute;a Coronaria Primaria.</font></font></u> </p>     <p><u><font face="arial"><font size="-1">-Ventajas:</font></font></u>     <br> <font face="arial"><font size="-1">1)&nbsp; Excelente grado de reperfusi&oacute;n 80-90%.&nbsp; Flujo TIMI 3 en m&aacute;s del 90%.</font></font>     <br> <font face="arial"><font size="-1">2)&nbsp; Pocas contraindicaciones.</font></font>     <br> <font face="arial"><font size="-1">3)&nbsp; Trata la estenosis y la oclusi&oacute;n.</font></font>     <br> <font face="arial"><font size="-1">4)&nbsp; Grado de reperfusi&oacute;n valorado r&aacute;pidamente.</font></font>     <br> <font face="arial"><font size="-1">5)&nbsp; Facilita el diagn&oacute;stico:&nbsp; permite valorar la extensi&oacute;n y severidad de la enfermedad coronaria.</font></font>     <br> <font face="arial"><font size="-1">6)&nbsp; Efectiva en situaciones de inestabilidad hemodin&aacute;mica.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="arial"><font size="-1">7)&nbsp; Facilita acceso para la colocaci&oacute;n de Bal&oacute;n de Contrapulsaci&oacute;n intra-a&oacute;rtico.</font></font>     <br> <font face="arial"><font size="-1">8)&nbsp; Baja mortalidad.</font></font> </p>     <p><u><font face="arial"><font size="-1">Desventajas:</font></font></u>     <br> <font face="arial"><font size="-1">1)&nbsp; Requiere de acceso al laboratorio de cateterismo las 24 hrs.</font></font>     <br> <font face="arial"><font size="-1">2)&nbsp; Requiere personal especializado (mas de 75 casos de angioplast&iacute;a por a&ntilde;o) y de un centro con gran n&uacute;mero de procedimientos (200-300 por a&ntilde;o).</font></font>     <br> <font face="arial"><font size="-1">3)&nbsp; Procedimiento caro (inicialmente).</font></font>     <br> <font face="arial"><font size="-1">4)&nbsp; Puede prolongar el inicio del tratamiento inaceptablemente.</font></font>     <br> <font face="arial"><font size="-1">5)&nbsp; Reestenosis alta.&nbsp; Disminuye con la colocaci&oacute;n de Stent.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">El futuro de la reperfusi&oacute;n</font></font></b> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1"><b>A)&nbsp; Nuevos Trombol&iacute;ticos. </b>Una nueva mutaci&oacute;n de t-PA, <b>TNK-tPA (TENECTEPLASE),</b>&nbsp; ha mostrado buenas expectativas.&nbsp; Ha sido aprobada por la FDA en julio de &eacute;ste a&ntilde;o.&nbsp; Su vida media prolongada ha permitido su uso en bolo en 5 a 10 segundos.&nbsp; Los estudios TIMI-10 B (<a  href="#66%29">66</a>) y ASSENT 2 (<a href="#67%29">67</a>) han encontrado que a los 90' se obtuvo un flujo TIMI 3 semejante a t-PA.</font></font> </p>     <p><font face="arial"><font size="-1"><b>LANOTEPLASE:&nbsp; </b>es un nuevo activador sint&eacute;tico del plasmin&oacute;geno, m&aacute;s potente que Alteplase, vida media m&aacute;s prolongada y se administra en bolo.&nbsp;&nbsp; En el estudio TIME-II (<a href="#68%29">68</a>) fue equivalente a Alteplase en reducir la mortalidad a 30 d&iacute;as pero con una incidencia mayor de hemorragia intracraneana.</font></font> </p>     <p><font face="arial"><font size="-1"><b>Staphylokinasa Recombinante (STAR) </b>es un agente fibrinol&iacute;tico de origen bacteriano.&nbsp; Recanaliza eficiente y r&aacute;pidamente las arterias coronarias y es m&aacute;s espec&iacute;fico de fibrina que el r-tPA (<a href="#69%29">69</a>).&nbsp; Tambi&eacute;n ha demostrado ser &uacute;til en oclusi&oacute;n arterial perif&eacute;rica (<a href="#70%29">70</a>).</font></font> </p>     <p><b><font face="arial"><font size="-1">B)&nbsp; Asociaci&oacute;n de Inhibidores de las glicoprote&iacute;nas IIb/IIIa con trombol&iacute;ticos.</font></font></b>     <br> <font face="arial"><font size="-1">El trombo que obstruye la arteria infartada en pacientes con elevaci&oacute;n del ST consiste de m&uacute;ltiples elementos que incluye plaquetas, trombina y una red de fibrina, pero su uso aumenta la actividad de la trombina y de las plaquetas.&nbsp; En respuesta a la estimulaci&oacute;n de la trombina las plaquetas expresan receptores GP IIb/IIIa en su superficie con la cual por medio del fibrin&oacute;geno presenta una mayor superficie para la formaci&oacute;n de complejos&nbsp; de protrombina y la generaci&oacute;n adicional de trombina (<a  href="#71%29">71</a>,<a href="#72%29">72</a>).&nbsp;&nbsp; Otra consecuencia de la activaci&oacute;n plaquetaria que facilita la formaci&oacute;n del trombo es la liberaci&oacute;n de un inhibidor de la activaci&oacute;n del plasmin&oacute;geno 1 (PAI-1) y de sustancias vasoconstrictoras.&nbsp; De tal manera que el trombo rico en plaquetas es m&aacute;s resistente a la trombol&iacute;sis y por la activaci&oacute;n plaquetaria facilita la reoclusi&oacute;n.</font></font> </p>     <p><font face="arial"><font size="-1">Para poder vencer esta resistencia a la trombol&iacute;sis y conociendo la estructura del trombo, la fibrina, la trombina y las plaqueta es que la terapia del IAM est&aacute; dirigida hacia la inhibici&oacute;n de estos componentes (<a href="#73%29">73</a>).</font></font> </p>     <p><font face="arial"><font size="-1"><b>-Fibrina:&nbsp; </b>Activadores PLasmin&oacute;geno o fibrinol&iacute;ticos, t-PA, r-PA, SK, TNK-tPA.</font></font> </p>     <p><font face="arial"><font size="-1"><b>-Trombina:&nbsp; </b>terapia anti-trombina, Heparina no Fraccionada, Heparina de bajo perso molecular.</font></font> </p>     <p><font face="arial"><font size="-1"><b>-Plaquetas:&nbsp; </b>Terapia antiplaquetaria.&nbsp; Aspirina, Inhibidores GP IIb/IIIa.</font></font> </p>     <p><font face="arial"><font size="-1">En base a estos conocimientos es que se pens&oacute; en asociar potentes agentes antiplaquetarios con agentes trombol&iacute;ticos para ver si era factible reducir el riesgo de reoclusi&oacute;n.</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">En el estudio TIMI 14 (<a  href="#74%29">74</a>) los investigadores combinarion dosis parciales del agente trombol&iacute;tico Alteplase con el Inhibidor de la GP IIb/IIIa Abciximab con dosis bajas o muy bajas de Heparina.&nbsp; Obtuvieron flujo TIMI 3 a los 60 y 90 minutos muy similares a los logrados con angioplast&iacute;a, con una incidencia de sangrado serio o hemorragia intra-craneana muy baja semejante a la observada con los reg&iacute;menes trombol&iacute;ticos est&aacute;ndar.&nbsp; Cuando se asoci&oacute; Streptokinasa a Abciximab la incidencia de sangrado fu&eacute; prohibitivo.</font></font> </p>     <p><font face="arial"><font size="-1">La normalizaci&oacute;n de la elevaci&oacute;n del segmento ST en el ECG se ha utilizado como un indicador no invasivo de la permeabilidad de la arterria infartada en la trombol&iacute;sis (<a  href="#75%29">75</a>).&nbsp; Los pacientes que tienen recuperaci&oacute;n completa del segmento ST tienen un 94% de probabilidad de tener la arteria infartada permeable y un riesgo muy bajo de muerte a corto plazo (<a href="#76%29">76</a>).&nbsp;&nbsp; Los investigadores del estudio TIMI 14 (<a href="#77%29">77</a>)&nbsp; compararon la reducci&oacute;n del segmento ST en los pacientes tratados con s&oacute;lo&nbsp; t-PA o con la combinaci&oacute;n de la dosis reducida de t-PA m&aacute;s Abciximab.&nbsp; Los pacientes tratados s&oacute;lo con t-PA la resoluci&oacute;n fue de 37% vrs&nbsp; 59% con la combinaci&oacute;n de medicamentos.&nbsp; La asociaci&oacute;n de estos medicamentos mejora la reperfusi&oacute;n mioc&aacute;rdica (micro-vascular) y el flujo epic&aacute;rdico.</font></font> </p>     <p><font face="arial"><font size="-1">Ohman y colaboradores del estudio IMPACT-AMI (<a href="#78%29">78</a>) utilizaron el inhibidor de la GP IIb/IIIa de acci&oacute;n r&aacute;pida Eptifibatide que combiado con Alteplase mostr&oacute; a los 90 minutos flujo TIMI 3 del 66% comparado con el grupo con s&oacute;lo Alteplase de 39%.</font></font> </p>     <p><font face="arial"><font size="-1">En el editorial de la revista Circulation (<a href="#79%29">79</a>) el Dr Kenedy analiza la combinaci&oacute;n farmacol&oacute;gica en la reperfusi&oacute;n y menciona que &eacute;sta con algunas modificaciones proablemente ser&aacute; equivalente o superior&nbsp; a la terapia de reperfusi&oacute;n mec&aacute;nica.&nbsp; Cuando este punto est&eacute; debidamente aclarado la angioplast&iacute;a primaria posiblemente se utilizar&aacute; en aquellos pacientes en los que la terapia farmacol&oacute;gica haya fracasado o en aquellos que presenten contraindicaciones absolutas para su uso.</font></font> </p>     <p><b><font face="arial"><font size="-1">C) Combinaci&oacute;n de Adenosina y Trombol&iacute;ticos en el IAM.</font></font></b> </p>     <p><font face="arial"><font size="-1">La Adenosina ha sido estudiada extensamente como un agente cardioprotector.&nbsp; Se han demostrado que restaura las reservas de fosfato&nbsp; de las c&eacute;lulas endoteliales y mioc&aacute;rdicas, inhibe la formaci&oacute;n de radicales libres, inhibe la actividad de los neutr&oacute;filos y su acumulaci&oacute;n, mejora la funci&oacute;n microvascular.&nbsp; En modelos animales reduce el tama&ntilde;o del infarto, mejora la funci&oacute;n ventricular y el flujo coronario.&nbsp; El estudio AMISTAD (<a href="#80%29">80</a>)&nbsp; demostr&oacute; que el uso de Adenosina asociado a la trombol&iacute;sis redujo el tama&ntilde;o del infarto en un 67% pero solamente en&nbsp; pacientes con infartos anteriores.&nbsp; A pesar de la reducci&oacute;n del tama&ntilde;o del infarto en el grupo con Adenosina, la evoluci&oacute;n intra-hospitalaria en ambos grupos fue similar.&nbsp; Los autores recomiendan estudios de mayor vol&uacute;men para poder evaluar mejor la utilidad de este medicamento.</font></font> </p>     <p><b><font face="arial"><font size="-1">D)&nbsp; Combinaci&oacute;n de Trombol&iacute;sis y Angioplast&iacute;a de Rescate PLanificada.</font></font></b> </p>     <p><font face="arial"><font size="-1">La literatura reciente en el manejo del IAM ha hecho &eacute;nfasis en la necesidad de seleccionar un m&eacute;todo espec&iacute;fico de reperfusi&oacute;n, ya sea la terapia fibrinol&iacute;tica o la terapia de reperfusi&oacute;n mec&aacute;nica.&nbsp; Una alternativa ser&iacute;a la combinaci&oacute;n de estos dos m&eacute;todos de reperfusi&oacute;n.&nbsp; Estudios anteriores utilizando esta asociaci&oacute;n mostr&oacute; gran n&uacute;mero de efectos adversos por lo que fue desechada por muchos a&ntilde;os (<a href="#81%29">81</a>).</font></font> </p>     <p><font face="arial"><font size="-1">Lo atractivo de esta combinaci&oacute;n de estrategias es el de superar el modesto grado de reperfusi&oacute;n que se obtiene con la trombol&iacute;sis, usando la angioplast&iacute;a de rescate planificada, con lo cual se mejora la reperfusi&oacute;n y tambi&eacute;n disminuye el tiempo de espera para recibir el tratamiento adecuado.</font></font> </p>     <p><font face="arial"><font size="-1">El Dr Allan Ross y el grupo de investigadores del estudio PACT (<a href="#82%29">82</a>) utilizaron dosis bajas de trombol&iacute;ticos de acci&oacute;n corta rt-PA (Activase) junto con la angioplast&iacute;a de rescate planificada y concluyeron:&nbsp; el estudio ha demostrado que a pesar de usar dosis bajas de rt-PA se obtuvo flujo TIMI 2-3&nbsp;&nbsp; en&nbsp; 61% de los pacientes y TIMI 3 en 33% versus 15% en placebo.&nbsp; Cuando se requiere la angioplast&iacute;a de rescate no hay disminuci&oacute;n en el &eacute;xito del procedimiento y no aumentan las compliacaciones.&nbsp; La trombol&iacute;sis usada en este estudio y la angioplast&iacute;a son totalmente compatibles.&nbsp; Este tipo de combinaci&oacute;n permitir&aacute; tratar a los pacientes inicialmente con la trombol&iacute;sis y luego trasladarlos a un centro con facilidades de cateterismo y angioplast&iacute;a coronaria (<a href="#83%29">83</a>).</font></font> </p>     ]]></body>
<body><![CDATA[<p><b><font face="arial"><font size="-1">Combinaci&oacute;n de Inhibidores de la GP IIb/IIIa y Angioplast&iacute;a Coronaria Primaria.</font></font></b> </p>     <p><font face="arial"><font size="-1">Con el uso de estos inhibidores en pacientes sometidos a una angioplast&iacute;a coronaria de rutina se ha demostrado una disminuci&oacute;n de los eventos isqu&eacute;micos (<a  href="#84%29">84</a>).</font></font> </p>     <p><font face="arial"><font size="-1">El uso de Abciximab en el tratamiento del IAM elegible para angioplast&iacute;a coronaria promaria fue evaluada en el estudio GRAPE (<a href="#85%29">85</a>).&nbsp; El medicamento se aplic&oacute; en el servicio de emergencias a pacientes en espera de la angioplast&iacute;a.&nbsp; Solamente el 20% de los pacientes presentaron flujo TIMI 3 a los 45 minutos de iniciado el tratamiento.&nbsp; Dado el n&uacute;mero bajo de pacientes ser&aacute;n necesarios estudios m&aacute;s grandes para definir el papel de este medicamento en la angioplat&iacute;a primaria.</font></font> </p>     <p><font face="arial"><font size="-1">El estudio RAPPORT (<a  href="#86%29">86</a>)&nbsp; utiliz&oacute; Abciximab en 483 pacientes con IAM a los cuales se les iba a realizar angioplast&iacute;a primaria.&nbsp;&nbsp; Se demostr&oacute; una reducci&oacute;n del 36% en la mortalidad, una disminuci&oacute;n de reinfarto y en la necesidad de revascularizaci&oacute;n en los pacientes que recibieron el tratamiento.</font></font> </p>     <p><b><font face="arial"><font size="-1">Cirug&iacute;a Coronaria de Emergencia.</font></font></b> </p>     <p><font face="arial"><font size="-1">Rara vez el uso de la cirug&iacute;a de revascularizaci&oacute;n de emergencia est&aacute; indicada en el IAM.&nbsp; Se reserva usualmente para aquellos pacientes con enfermedad coronaria m&uacute;ltiple con isquemia persistente, en el shock cardiog&eacute;nico despu&eacute;s del fracaso de la trombol&iacute;sis o de la angioplast&iacute;a coronaria y en las complicaiones mec&aacute;nicas del IAM (<a  href="#87%29">87</a>,<a href="#88%29">88</a>,<a href="#89%29">89</a>).</font></font>     <br> &nbsp;     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Terapia farmacol&oacute;gica:</font></font></b> </p>     <p><b><font face="arial"><font size="-1">A)&nbsp; Terapia antiplaquetaria y antitromb&oacute;tica.</font></font></b> </p>     ]]></body>
<body><![CDATA[<p><font face="arial"><font size="-1">Aspirina (ya mencionada en medidas generales).&nbsp; Ticlodipina y Clopidogrel (131).&nbsp; Son agentes antiplaquetarios que inhiben la agregaci&oacute;n plaquetaria por una modificaci&oacute;n irreversible en los sitios de uni&oacute;n de las plaquetas.&nbsp; No han sido estudiados en la fase aguda del&nbsp; IM. Muy &uacute;tiles asociados a la aspirina en el manejo del Stent intra-coronario (132).</font></font> </p>     <p><font face="arial"><font size="-1">Heparina.&nbsp; Es un compuesto antitrombina que reduce&nbsp; la deposici&oacute;n de plaquetas y fibrina.</font></font>     <br> <font face="arial"><font size="-1">Se utiliza la Heparina no fraccionada en al IAM con elevaci&oacute;n del segmento ST en pacientes que no tengan contraindicaciones para la anticoagulaci&oacute;n y que no sean candidatos para la trombol&iacute;sis (<a href="#90%29">90</a>,<a href="#91%29">91</a>).&nbsp; Las dosis a usar var&iacute;an de 7.500 UI subcut&aacute;nea cada 12 horas hasta dosis completas reducidas hoy en&nbsp; d&iacute;a a 60 IU/Kg en bolo y una infusi&oacute;n de 12 U/Kg/hr para mantener un TPT de 1.5 a 2 veces el normal.</font></font> </p>     <p><font face="arial"><font size="-1">Los pacientes que reciben trombol&iacute;sis con Alteplase&nbsp; (t-PA) se utiliza heparina no fraccionada concomitantemente a dosis como&nbsp; anteriormente descrita con un m&aacute;ximo de bolo de 4000 Uds y 1000 Uds/hr por un per&iacute;odo de 48 hrs.&nbsp; Generalmente se puede descontinuar en pacientes de bajo riesgo.&nbsp; Se puede administrar subcut&aacute;nea en pacientes con riesgo de embolia sist&eacute;mica.</font></font> </p>     <p><font face="arial"><font size="-1">En los pacientes tratados con Streptokinasa no hay beneficio aparente con el uso inmediato de heparina IV. La &uacute;nica ecepci&oacute;n es en aquellos pacientes con infartos anteriores extensos, en&nbsp; la fibrilaci&oacute;n auricular, trombosis previa o trombo mural.&nbsp; Se recomienda esperar 6 horas antes del uso de la heparina, controlar el TPT que este menos de 2 veces el control (aproximado 70 seg).&nbsp; Se inicia la infusi&oacute;n con&nbsp; 1000 u/hr durante aproximadamente 48 hrs y de acuerdo a la condici&oacute;n cl&iacute;nica se cambia a heparina subcut&aacute;nea, Warfarina o Aspirina.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Las Heparinas de Bajo Peso Molecular son fragmentos de la heparina est&aacute;ndar producida por polimerizaci&oacute;n qu&iacute;mica o enzim&aacute;tica quue resuta en la producci&oacute;n de heparinas con un peso molecular entre 4.000 a 6.500.&nbsp; Varios estudios cl&iacute;nicos han demostrado su utilidad en el&nbsp; manejo de los S&iacute;ndromes Coronarios Agudos especialmente en la Angina Inestable&nbsp; y el IM no Q (<a href="#92%29">92</a>).</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">Ventajas cl&iacute;nicas de las Heparinas de bajo peso molecular.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">1)&nbsp; Respuesta m&aacute;s predeciblea una dosis fija.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">2)&nbsp; Una vida media prolongada y una disminuci&oacute;n del sangrado con efectos antibromb&oacute;ticos equivalentes.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="Arial,Helvetica"><font size="-1">3)&nbsp; Mayor seguridad y eficacia en el tratamiento de la trombosis venosa.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">4)&nbsp; No requiere de controles de anticoagulaci&oacute;n.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">5)&nbsp; Mas f&aacute;cil de aplicar.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Hay varias&nbsp; heparinas de bajo peso molecular en estudio.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Actualmente contamos con:&nbsp; Ardeparin, Dalteparina (Fragmin), Enoxaparina (Clexane), Nadroparina (Fraxiparina).</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">En el estudio HART II (<a  href="#93%29">93</a>) el Dr Ross compar&oacute; el uso de Heparina de bajo peso molecular Enoxaparina, t-PA y Aspirina contra Heparina no fraccionada, t-PA y Aspirina en pacientes con IAM con elevaci&oacute;n del segmento ST.&nbsp; Los autores demostraron que la Enoxaparina puede sustituir a la heparina no fraccionada asociada a t-PA y Aspirina.&nbsp; M&aacute;s estudios y mayor n&uacute;mero de pacientes deben ser analizados antes de usar rutinariamente las Heparinas de bajo peso molecular en el IAM.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">La Hirudina es un inhibidor directo de la trombina que puede tener algunas ventajas sobre la Heparina (<a href="#94%29">94</a>).&nbsp; Los investigadores del estudio Gusto IIb encontraron que la mortalidad y la incidencia de IM en el manejo del S&iacute;ndrome Coronario Agudo fue de 8.9% en el grupo con Hirudina vrs 9.8% en el grupo con Heparina.&nbsp; El estudio TIMI 9b (<a href="#95%29">95</a>) indic&oacute; que la Heparina y la Hirudina eran igualmente efectivas en prevenir la muerte y el reinfarto.&nbsp; Cuando se usa con terapia trombol&iacute;tica puede tener cierta ventaja sobre la Heparina (<a href="#96%29">96</a>).</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">B)&nbsp; Nitroglicerina:</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">Tradicionalmente los nitratos se han usado en los SCA desde 1970.&nbsp; Act&uacute;an produciendo una vasodilataci&oacute;n coronaria, arterial perif&eacute;rica y venodilataci&oacute;n con lo cual reduce la pre y post carga, aumenta la perfusi&oacute;n a las zonas isqu&eacute;micas, disminuye el tama&ntilde;o del infarto y mejora la funci&oacute;n ventricular (<a href="#97%29">97</a>,<a href="#98%29">98</a>).</font></font> </p>     ]]></body>
<body><![CDATA[<p><b><font face="Arial,Helvetica"><font size="-1">Indicaciones:</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">1)&nbsp; En las primeras 24 a 48 hrs en todos los pacientes con IAM y con Insuficiencia Card&iacute;aca, Infarto Anterior extenso, Isquemia persistente o Hipertensi&oacute;n.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">2)&nbsp; Uso continuo en pacientes con angina recurrente o congesti&oacute;n pulmonar.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">3)&nbsp; Uso con precauci&oacute;n en pacientes con bradicardia severa, hipotensi&oacute;n, taquicardia o infarto del ventr&iacute;culo derecho.&nbsp; Puede provocar tolerancia su uso prolongado (<a href="#99%29">99</a>,<a href="#100%29">100</a>).</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">4)&nbsp; Dosis inicial de 5 micro gramos/min con incrementos iguales hasta una disminuci&oacute;n del dolor o de Presi&oacute;n Arterial Sist&oacute;lica en un&nbsp; 10% en pacientes normotensos y un 30% en hipertensos.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">C)&nbsp; Agentes Bloqueadores Beta Adren&eacute;rgicos.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">La administraci&oacute;n temprana de estos agentes en el IAM reduce el riesgo de muerte s&uacute;bita y de reinfarto.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Su mecanismo de acci&oacute;n es por una disminuci&oacute;n en el consumo de ox&iacute;geno del miocardio, por una disminuci&oacute;n de la frecuencia card&iacute;aca, de la presi&oacute;n arterial sist&eacute;mica&nbsp; y de la contractilidad mioc&aacute;rdica (<a href="#101%29">101</a>,<a href="#102%29">102</a>,<a href="#103%29">103</a>,<a  href="#104%29">104</a>).</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Bloquean el efecto adverso de la activaci&oacute;n simp&aacute;tica y tienen propiedades antiarr&iacute;tmicas muy &uacute;tiles.&nbsp; Los resultados de estudios cl&iacute;nicos documentan una impresionante disminuci&oacute;n en la mortalidad temprana y tard&iacute;a.&nbsp; En la revisi&oacute;n de 28 estudios con agentes boqueadores beta adren&eacute;rgicos (<a href="#105%29">105</a>), la reducci&oacute;n promedio de la mortalidad fue de 28% en una semana, boteniendo el mayor beneficio en las primeras 24 hrs.</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="Arial,Helvetica"><font size="-1">Se documento una disminuci&oacute;n de 18% de reinfarto y de un 15% en pparo cardiorespiratorio.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">Contraindicaciones:</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">1)&nbsp; Bradicardia severa (FC &lt; 50 lpm).</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">2)&nbsp; Bloqueo AV de 2<sup>do&nbsp;</sup> o 3<sup>er</sup> grado.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">3)&nbsp; Edema Pulmonar.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">4)&nbsp; Shock Cariog&eacute;nico.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">5)&nbsp; Asma.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">6)&nbsp; EPOC severo.</font></font>     <br> &nbsp; </p>     ]]></body>
<body><![CDATA[<p><b><font face="Arial,Helvetica"><font size="-1">Dosis:</font></font></b>     <br> <font face="Arial,Helvetica"><font size="-1"><b>Metroprolol:&nbsp; </b>se administra a 5 mrg IV cada 2-5 minutos por 3&nbsp; dosis.&nbsp; Si no hay efectos adversos despu&eacute;s de 15 minutos de la administraci&oacute;n de la &uacute;ltima dosis se inicia 25-50 mgr por v&iacute;a oral cada 6 hrs por dos d&iacute;as y luego 50-100 mgr bid.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1"><b>Atenol:&nbsp; </b>5-10 mgr IV seguido de dosis por v&iacute;a oral.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1"><b>Propanolol:&nbsp; </b>0.5mgr IV con incrementos cada 5 minutos hasta efecto buscado o dosis m&aacute;xima de 0.1 mgr/Kg.</font></font> </p>     <p><b><font face="Arial,Helvetica"><font size="-1">Esmolol (<a  href="#106%29">106</a>): </font></font></b><font face="Arial,Helvetica"><font size="-1">Es una beta bloqueador de acci&oacute;n extremadamente corta, muy &uacute;til en pacientes que presenten contraindicaciones relativas en los cuales se desea una disminuci&oacute;n de la frecuencia&nbsp; card&iacute;aca.&nbsp; Dosis de inicio de 50 Microgr/Kg/min.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">D)&nbsp; Inhibidores de la Enzima Convertidora de Angiotensina.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">Los inhibidores de la ECA est&aacute;n claramente ubicados en el manejo del IAM.&nbsp; Estudios cl&iacute;nicos han establecido con gran claridad el beneficio de estas drogas (<a  href="#107%29">107</a>).&nbsp;&nbsp; Estos han sido divididos en dos grupos: e<u>studios no selectivos</u> aquellos en los cuales se les administr&oacute; la droga a todos los pacientes con IAM y los <u>estudios selectivos</u> en los que la droga fue administrada a s&oacute;lo pacientes de alto riesgo.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Estos &uacute;ltimos incluyen a SAVE (<a href="#108%29">108</a>), TRACE (<a href="#109%29">109</a>), AIRE (<a href="#110%29">110</a>), AIREX (<a href="#111%29">111</a>).&nbsp; Se document&oacute; una reducci&oacute;n de la mortalidad de 40 a 70 vidas salvadas por cada 1.000 pacientes tratados.&nbsp; Los inhibidores se deben iniciar idealmente en las primeras 24 hrs en tdos los pacientes con IAM, despu&eacute;s de la terapia trombol&iacute;tica y de que la presi&oacute;n arterial se encuentre estable.&nbsp; Los pacientes de alto riesgo que m&aacute;s se benefician son aquellos con infartos previos, insuficiencia card&iacute;aca, infartos anteriores y pacientes taquic&aacute;rdicos.&nbsp; Los pacientes de bajo riesgo que no presenten complicaciones y que no tienen evidencia de disfunci&oacute;n ventricular sintom&aacute;tica o asintom&aacute;tica se deben valorar a las 4-6 semanas y si no hay complicaciones se puede suspender el tratamiento con los inhibidores.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Su&nbsp; uso no esta indicado si la PA sist&oacute;lica es &lt; de 100 mmHg, si hay insuficiencia renal severa o si existe historia de estenosis de la arteria renal o alergia severa a los inhibidores de la ECA.</font></font> </p>     ]]></body>
<body><![CDATA[<p><font face="Arial,Helvetica"><font size="-1">Se debe utilizar dosis bajas inicialmente de Enalapril, Captopril, Lisinopril o Ramipril&nbsp; y aumentar progresivamente hasta lograr el efecto deseado.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">E)&nbsp; Bloqueadores de los canales del Calcio.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">Su uso rutinario en el IAM no est&aacute; indicado.&nbsp; Se puede utilizar para tratar angina post infarto en pacientes que no pueden utilizar beta bloqueadores y tambi&eacute;n en aquellos pacientes con Fibrilaci&oacute;n Auricular para el control de la frecuencia card&iacute;aca.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">F) Magnesio.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">Su utilizaci&oacute;n en el manejo del IAM permanece controversial.&nbsp; Los lineamientos del Colegio Americano y de la Asociaci&oacute;n Americana del Coraz&oacute;n no recomiendan su uso rutinario.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">En modelos de reperfusi&oacute;n animal se demostr&oacute; un efecto protector del magnesio sobre el miocardio.&nbsp; El estudio LIMIT-2 (<a href="#113%29">113</a>) demostr&oacute; una disminuci&oacute;n de la mortalidad en pacientes tratados con magnesio del 24% y un 25% menos de incidencia de insuficiencia card&iacute;aca.&nbsp; El estudio m&aacute;s grande realizado hhasta la fecha ISIS-4 (<a href="#114%29">114</a>) con 58.050 pacientes&nbsp; randomiz&oacute; un grupo&nbsp; con magnesio y otro con placebo.&nbsp; No se observ&oacute; ning&uacute;n beneficio en el grupo tratado con magnesio.&nbsp; En otro estudio peque&ntilde;o de 194 pacientes no considerados candidatos para terapia trombol&iacute;tica (<a  href="#115%29">115</a>), la mortalidad intra-hospitalaria fue de 4% en pacientes tratados con magnesio vrs 17% en el grupo no tratado.&nbsp; En el an&aacute;lisis de sub-grupos, los pacientes mayores de 70 a&ntilde;os la disminuci&oacute;n de la mortalidad fu&eacute; a&uacute;n mayor, 9% en los tratados vrs 23% en los no tratados.&nbsp; El estudio MAGIC (Magnesium in Coronary&nbsp; Artery Disease) se est&aacute; realizando y hasta que no se presente el an&aacute;lisis final no tendremos una posici&oacute;n actual m&aacute;s clara con el uso de Magnesio.&nbsp; La recomendaci&oacute;n actual es de usarlo en pacientes que presentan d&eacute;ficit de magnesio con episodios de Taquicardia Ventricular Torsades de Pointes y probablemente en pacientes de alto riesgo en quienes no se puede aplicar la terapia trombol&iacute;tica.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">La dosis&nbsp; &oacute;ptima no se ha establecido.&nbsp; Por lo general se aplica 2 gr IV en 5-151 minutos seguido de una infusi&oacute;n de 18 grs en 24 hrs.</font></font>     <br> &nbsp; </p>     ]]></body>
<body><![CDATA[<p><b><font face="Arial,Helvetica"><font size="-1">G)&nbsp; Glucosa Insulina y Potasio.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">Propuesto su uso originalmente por el Dr Sodi-Pallares en 1969 (<a href="#116%29">116</a>).&nbsp; El estudio del Grupo Estudios Cardiol&oacute;gicos Latinoam&eacute;rica (<a  href="#117%29">117</a>) report&oacute; el uso de GIP en 407 pacientes demotrando una disminuci&oacute;n significativa&nbsp; en muerte, insuficiencia card&iacute;aca y fibrilaci&oacute;n ventricular en el grupo tratado.&nbsp; Otro estudio DIGAMI (<a  href="#108%29">118</a>) report&oacute; una reducci&oacute;n del 30% en la mortalidad a un a&ntilde;o en pacientes diab&eacute;ticos con IAM que recibieron un r&eacute;gimen estricto de Glucosa e Insulina por 24 hrs seguido de inyecciones subcut&aacute;neas de insulina durante 3 meses.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">H)&nbsp; Estatinas.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">Estas drogas que son altamente efectivas en la prevenci&oacute;n primaria y secundaria de la enfermedad coronaria se han empezado a utilizar en la fase aguda del infarto del miocardio.&nbsp; Se ha demostrado que mejoran la vasodilataci&oacute;n endotelio-dependiente posiblemente mejorando la producci&oacute;n de &oacute;xido nitroso y estabilizando las lesiones vasculares ateroscler&oacute;ticas, posiblemente al reducir el est&iacute;mulo inflamatorio.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">La Pravastatina en combinaci&oacute;n con la terapia trombol&iacute;tica redujo la morbilidad y mortalidad en pacientes con&nbsp; IAM (<a href="#119%29">119</a>).</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">En la reuni&oacute;n del Colegio Americano del Coraz&oacute;n en Febrero de este a&ntilde;o el grupo de la Cl&iacute;nica Mayo (<a href="#120%29">120</a>) en un estudio con estatinas en el momento de la presentaci&oacute;n del infarto mostraron que se obtiene una&nbsp; menor mortalidad intra-hospitalaria, menores niveles pico de CPK y un menor uso de Lidoca&iacute;na para tratar arritmias ventriculares.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1">Otro estudio presentado por la Cleveland Clinic (<a href="#121%29">121</a>) en la misma &eacute;poca mostraron tambi&eacute;n una mehor evoluci&oacute;n de los pacientes tratados con estarinas.&nbsp; Con &eacute;sta informaci&oacute;n preliminar queda abierto el camino para el desarrollo de nuevos y definitivos estudios para la utilizaci&oacute;n de las estatinas en los S&iacute;ndromes Coronarios Agudos.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">I)&nbsp; Warfarina.</font></font></b> </p>     ]]></body>
<body><![CDATA[<p><font face="Arial,Helvetica"><font size="-1">El uso de la anticoagulaci&oacute;n oral despu&eacute;s del IAM ha sido muy controversial.&nbsp; En la actualidad se utiliza en pacientes con Fibrilaci&oacute;n Auricular y en pacientes que presenten trombos en el VI.&nbsp; Las dudas persisten en pacientes con&nbsp; infartos extensos y con zonas aquin&eacute;ticas grandes, para prevenir la posibilidad de accidentes vasculares emb&oacute;licos.&nbsp; En los lineamientos anteriores se recomendaba la anticoagulaci&oacute;n por un per&iacute;odo de 3 meses.&nbsp; Actualmente queda a criterio del m&eacute;dico tratante el uso de este medicamento en estas circunstancias.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">Medidas Complementarias en la Unidad Coronaria.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1"><b>Dieta:&nbsp; </b>Nada v&iacute;a oral o solamente l&iacute;quidos claros en las primeras 12 hrs.&nbsp; Continuar luego con la dieta recomendada por la Sociedad Americana del Coraz&oacute;n, la de Fase II, la cual es baja en grasa saturada (menos del 7% de las calor&iacute;as) y en colesterol (menos de 200 mrg).&nbsp; Preferiblemente alimentos ricos en potasio, magnesio, fibra y baja en sodio.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1"><b>Reposo:&nbsp; </b>Las primeras 12 hrs en cama en pacientes hemodin&aacute;micamente estables y sin dolor.&nbsp; Pueden utilizar facilidades al lado de la cama para sus necesidades fisiol&oacute;gicas.&nbsp; Reducir al m&iacute;nimo las visitas.&nbsp; El progreso de la actividad debe individualizarse para que &eacute;sta continu&eacute; lenta y progresivamente hasta ser externado.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1"><b>Ansiol&iacute;ticos:&nbsp; </b>No es necesario su uso rutinario, solamente en aquellos pacientes con marcada ansiedad o que los utilizaban de previo.&nbsp; El soporte psicol&oacute;gico de parte del personal y de la familia es muy importante.</font></font> </p>     <p><font face="Arial,Helvetica"><font size="-1"><b>Evitar:&nbsp; </b>Las maniobras de Valsalva.&nbsp; Se deben utilizar alimentos altos en&nbsp; fibra o medicamentos que faciliten las evacuaciones intestinales.</font></font> </p>     <p><b><font face="Arial,Helvetica"><font size="-1">Complicaciones Intra-hospitalarias.</font></font></b> </p>     <p><font face="Arial,Helvetica"><font size="-1">1)&nbsp; Arritmias auriculares y ventriculares.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">2)&nbsp; Bradiarritmias y transtornos de la coducci&oacute;n.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="Arial,Helvetica"><font size="-1">3)&nbsp; Dolor isqu&eacute;mico persistente o recurrente.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">4)&nbsp; Extensi&oacute;n del infarto (reinfarto).</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">5)&nbsp; Expansi&oacute;n del infarto (aneurisma).</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">6)&nbsp; Shock Cardi&oacute;genico.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">7)&nbsp; Insuficiencia card&iacute;aca derecha o izquierda.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">8)&nbsp; Dsifunci&oacute;n o ruptura m&uacute;sculo papilar.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">9)&nbsp; Ruptura Septum o Pared libre del IV.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">10)&nbsp; Infarto del ventr&iacute;culo Derecho.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">11)&nbsp; Pericarditis.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">12)&nbsp; Trombosis venosa.&nbsp; Embolia Pulmonar.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="Arial,Helvetica"><font size="-1">13)&nbsp; Transtornos Psicol&oacute;gicos.</font></font>     <br> &nbsp; </p>     <p><b><font face="Arial,Helvetica"><font size="-1">Manejo posterior del paciente con IAM</font></font></b> </p>     <p><u><font face="Arial,Helvetica"><font size="-1">Estratificaci&oacute;n de Riesgo Coronario</font></font></u>     <br> <font face="Arial,Helvetica"><font size="-1">Estimaci&oacute;n muy razonable en relaci&oacute;n a la morbilidad y mortalidad futura se puede establecer en base a par&aacute;metros cl&iacute;nicos y de laboratorio.&nbsp; El pron&oacute;stico va en relaci&oacute;n a varios factores de los cu&aacute;les el m&aacute;s importante sigue siendo el tama&ntilde;o del infarto (122).</font></font> </p>     <p><u><font face="Arial,Helvetica"><font size="-1">Estos factores de pron&oacute;stico se pueden dividir en:</font></font></u> </p>     <p><font face="Arial,Helvetica"><font size="-1">A)&nbsp; Mec&aacute;nicos</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">B)&nbsp; Isqu&eacute;micos</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">C)&nbsp; Electrofisiol&oacute;gicos</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">D)&nbsp; Generales</font></font> </p>     ]]></body>
<body><![CDATA[<center><img src="/img/fbpe/rcc/v2n3/0498i5.JPG" height="633"  width="521"></center> &nbsp;     
<br> &nbsp;     <p><u><font face="arial"><font size="-1">En base a la presencia o no de factores de riesgo los pacientes pueden ser evaluados antes de ser externados con el siguiente esquema:</font></font></u>     <br> &nbsp; </p>     <center><img src="/img/fbpe/rcc/v2n3/0498i6.JPG" height="620"  width="616"></center> &nbsp;     
<br> <font face="arial"><font size="-1">El manejo a corto plazo del paciente post IAM depender&aacute; fundamentalmente de su condici&oacute;n cl&iacute;nica, de la anatom&iacute;a coronaria y de la funci&oacute;n del VI. Resultados obtenidos despu&eacute;s de la trombol&iacute;sis muestran diferentes grados de enfermedad coronaria residual(<a href="#123%29">123</a>). Por &eacute;sta raz&oacute;n muchos cardi&oacute;logos hoy en d&iacute;a realizan la angiograf&iacute;a coronaria despu&eacute;s del uso exitoso de la trombol&iacute;sis a pesar de que &eacute;sta conducta no es recomendada por el Colegio Americano de Coraz&oacute;n. No hay evidencia clara de que el conocimiento de la anatom&iacute;a coronaria mejore el pron&oacute;stico de los pacientes que no tienen isquemia demostrable. Por el contrario el estudio DANAMI (<a href="#124%29">124</a>) s&iacute; mostr&oacute; clara evidencia de que en pacientes post-trombol&iacute;sis con isquemia inducible, el tratamiento invasivo, angioplast&iacute;a o cirug&iacute;a, result&oacute; en una disminuci&oacute;n de reinfarto, angina estable o inestable, comparado con el grupo tratado conservadoramente.</font></font>     <br> &nbsp;     <p><b><font face="arial"><font size="-1">Tratamiento y modificaci&oacute;n del riesgo coronario.</font></font></b> </p>     <p><b><font face="arial"><font size="-1">Prevenci&oacute;n secundaria.</font></font></b> </p>     <p><font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">A</font></b>spirina.</font></font>     ]]></body>
<body><![CDATA[<br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">B</font></b>eta bloqueadores.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">C</font></b>olesterol: Reducir LDL &lt; 100 mgr/dl. El estudio 4S (<a href="#125%29">125</a>) demostr&oacute; una disminuci&oacute;n del 30 % en la mortalidad total y 42 % en enfermedad coronaria en los pacientes tratados con Simvastatina. Resultados semejantes en el estudio CARE (<a href="#126%29">126</a>).</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">D</font></b>ieta : Estadio II dieta de la Sociedad Americana del Coraz&oacute;n.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">D</font></b>ieta Mediterr&aacute;nea (dieta Lyon) (<a href="#127%29">127</a>,<a  href="#128%29">128</a>).</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">E</font></b>jercicio, disminuci&oacute;n de peso, rehabilitaci&oacute;n y manejo adecuado de Stress.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">F</font></b>umar: programas especiales para dejar de fumar.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">G</font></b>en&eacute;tica: diferentes genes se han detectado como causantes de enfermedad coronaria de gran inter&eacute;s para el futuro(<a href="#133%29">133</a>).</font></font>     <br> <font face="arial"><font size="-1">-&nbsp;<b><font color="#3333ff"> H</font></b>ipertensi&oacute;n: controles estrictos para mantener normo-tensi&oacute;n.</font></font>     <br> <font face="arial"><font size="-1">-&nbsp; <b><font color="#3333ff">I</font></b>nhibidores ECA.</font></font>     <br> &nbsp; </p>     ]]></body>
<body><![CDATA[<p><b><font face="arial"><font size="-1">Nuevos Factores de Riesgo Coronario en Estudio:(<a href="#129%29">129</a>,<a href="#130%29">130</a>)</font></font></b> </p>     <p><font face="arial"><font size="-1">*Hiperhomocisteinemia.</font></font>     <br> <font face="arial"><font size="-1">*Stress oxidativo.</font></font>     <br> <font face="arial"><font size="-1">*Lp(a).</font></font>     <br> <font face="arial"><font size="-1">*Reservas de hierro.</font></font>     <br> <font face="arial"><font size="-1">*Factores de inflamaci&oacute;n:</font></font>     <br> <font face="arial"><font size="-1">-Prote&iacute;na C reactiva.</font></font>     <br> <font face="arial"><font size="-1">*Sustancias pro coagulantes:</font></font>     <br> <font face="arial"><font size="-1">-Fibrin&oacute;geno</font></font>     <br> <font face="arial"><font size="-1">-Factor VII</font></font>     ]]></body>
<body><![CDATA[<br> <font face="arial"><font size="-1">-Inhibidores de Activador del Plasmin&oacute;geno 1 (PAI 1)</font></font>     <br> <font face="arial"><font size="-1">*Agentes Infecciosos:</font></font>     <br> <font face="arial"><font size="-1">-Clamydia Pneumoniae.</font></font> </p>     <p><font face="arial"><font size="-1">La enfermedad cardiovascular contin&uacute;a siendo la causa m&aacute;s frecuente de muerte en todo el mundo, esto a pesar de los avances extraordinarios que se han obtenido en el diagn&oacute;stico y tratamiento del IAM. Debemos continuar con el prop&oacute;sito no s&oacute;lo de buscar mejores medicamentos y de equipo t&eacute;cnico sino en educar a pacientes y familiares sobre &eacute;sta enfermedad. Solamente con la prevenci&oacute;n y modificaci&oacute;n de los factores de riesgo coronario lograremos continuar disminuyendo la mortalidad de los S&iacute;ndromes Coronarios Agudos.</font></font>     <br> &nbsp; </p>     <p><b><font face="arial"><font size="-1">Referencias</font></font></b> </p>     <!-- ref --><p><a name="1)"></a><font face="ARIAL"><font size="-1"><b>1)</b> American Heart Association Heart and Stroke facts 1966. Statistical Supplement Dallas AHA: 1996;1-23.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724515&pid=S1409-4142200000030000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="2)"></a><font face="ARIAL"><font size="-1"><b>2)</b> Herlitz J,Blohn M,Hartford M.Delay time in suspected Acute Myocardial Infarction and the importance of its modification. Clin Cardiol 1989; 12: 370-374.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724516&pid=S1409-4142200000030000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="3)"></a><font face="ARIAL"><font size="-1"><b>3)</b> Farb A, Burke AP, Tang A L , et al. Coronary plaque erosion without rupture into a lipid core: A frequent cause of coronary thombosis in sudden coronary death. Circulation 1996;93:1354-1363.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724517&pid=S1409-4142200000030000800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="4)"></a><font face="ARIAL"><font size="-1"><b>4)</b> Dalager-Pederson S, Pederson E, Ringgaard S et al. Coronary Artery Disease : Plaque vulnerability, Disruption and thrombosis. From Fuster V.The Vulnerable Atherosclerotic Plaque, 1999; chapter 1: 1-23.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724518&pid=S1409-4142200000030000800004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="5)"></a><font face="ARIAL"><font size="-1"><b>5)</b> Toschi V, Gallo R,Lettino M et al. Tissue Factor modulates the thrombogenicity of Human Atherosclerotic Plaque. Circulation 1997;95: 594-599.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724519&pid=S1409-4142200000030000800005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="6)"></a><font face="ARIAL"><font size="-1"><b>6)</b> Falk E, Shah PK,Fuster V. Coronary Plaque disruption. Circulation 1995;92: 657-71.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724520&pid=S1409-4142200000030000800006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="7)"></a><font face="ARIAL"><font size="-1"><b>7)</b> Fuster V,Badimon JJ,Chesebro JH. The Pathogenesis of coronary artery disease and the Acute Coronary Syndromes. N Engl J Med 1992; 326:242-50.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724521&pid=S1409-4142200000030000800007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="8)"></a><font face="ARIAL"><font size="-1"><b>8)</b> Fuster V. The Vulnerable Atherosclerotic Plaque. American Heart Association Monograph series. Futura Publishing Company Inc 1999.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724522&pid=S1409-4142200000030000800008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="9)"></a><font face="ARIAL"><font size="-1"><b>9)</b> Muller JE, Abela GS,Nesto RW, Tofler GH. Triggers, acute risk factors, and vulnerable plaques: The Lexicon of a new frontier J Am Coll Cardiol 1994;23:809-813.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724523&pid=S1409-4142200000030000800009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="10)"></a><font face="ARIAL"><font size="-1"><b>10)</b> Canto J,Shlipak M,Rogers W et al. Prevalence, clinical characteristics, and mortality among patients with Myocardial Infarction presenting without chest pain. JAMA 2000,283: 3223-3229.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724524&pid=S1409-4142200000030000800010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="11)"></a><font face="ARIAL"><font size="-1"><b>11)</b> Reeder GS,Gersh BJ Acute Myocardial Infarction. Steins Internal Medicine. 1994:169-89.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724525&pid=S1409-4142200000030000800011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="12)"></a><font face="ARIAL"><font size="-1"><b>12)</b> Killip T,Kimball J. Treatment of Myocardial Infarction in a Coronary care unit. 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J Cardivasc Med 1983;9:1147</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724528&pid=S1409-4142200000030000800014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="15)"></a><font face="ARIAL"><font size="-1"><b>15)</b> Golberg R, Gore J, Alpert J et al Incidence and case fatality rates of Acute Myocardial Infarction. Am Heart J 1988; 115:761-767.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724529&pid=S1409-4142200000030000800015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="16)"></a><font face="ARIAL"><font size="-1"><b>16)</b> Gibleer W,Lewis L,Erb R et al. Early detection of Acute Myocardial Infarction in patients presenting with chest pain and nondiagnostic ECG: serial CK- MB sampling in the ER. Ann Emerg Med 1990;19:1359-1366.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724530&pid=S1409-4142200000030000800016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="17)"></a><font face="ARIAL"><font size="-1"><b>17)</b> Reeder G. Gersh B. Curr Prob Cardiol. Modern Management of Acute Myocardial Infarction. 1996; 21:597-600.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724531&pid=S1409-4142200000030000800017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="18)"></a><font face="ARIAL"><font size="-1"><b>18)</b> Coll S, Betriu A, De Flores T, et al. Significance of Q-wave regression after transmural Acute Myocardial Infarction. Am J Cardiol 1988;61:739.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724532&pid=S1409-4142200000030000800018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="19)"></a><font face="ARIAL"><font size="-1"><b>19)</b> Newby LK,Gibler WB, Ohman WM, et al. Biochemical markers in suspected Acute MyocardialInfarction. ClinChem. 1995; 41:1263.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724533&pid=S1409-4142200000030000800019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="20)"></a><font face="ARIAL"><font size="-1"><b>20)</b>Poleo PR, Meyer D, Wathen C et al. Use of a rapid assay of sub forms of Creatine kinase MB to diagnose or rule out Acute Myocardial Infarction. N Engl J Med. 1994;331:561-6.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724534&pid=S1409-4142200000030000800020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="21)"></a><font face="ARIAL"><font size="-1"><b>21)</b>Yee T, Goldman L. Evaluation of the patient with Acute Chest Pain. N Engl J Med 2000;342:1187-1195.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724535&pid=S1409-4142200000030000800021&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="22)"></a><font face="ARIAL"><font size="-1"><b>22)</b> Hamm CW, Goldmann BU, Heeschen C et al. Emergency room triage of patientes with Acute Chest Pain by means of rapid testing for cardiac troponin T or troponin I. N Engl J Med. 1997;337:1648-53.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724536&pid=S1409-4142200000030000800022&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="23)"></a><font face="ARIAL"><font size="-1"><b>23)</b> Luscher MS, Thygesen K,Ravkilde J. Applicability of cardiac troponin T and I for early risk stratification in unstable coronary artery disease. Circulation 1997;96: 2578-85.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724537&pid=S1409-4142200000030000800023&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="24)"></a><font face="ARIAL"><font size="-1"><b>24)</b> Hamm CW, Heeschen D,Goldmann BU et al. Cardiac troponin T levels for risk stratification in Acute Myocardial Ischemia. Abstr. J Am Coll Cardiol.1998;31:185 A.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724538&pid=S1409-4142200000030000800024&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="25)"></a><font face="ARIAL"><font size="-1"><b>25)</b> Hanam CH, Braunwald E. A Classification of Unstable Angina Reviseted. Circulation 2000;102:118-122.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724539&pid=S1409-4142200000030000800025&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="ARIAL"><font size="-1">26) Adams J,Abendschein D,Jaffe A, Biochemical markers of Myocardial injury. Circulation ,1993;88:750-763.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724540&pid=S1409-4142200000030000800026&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="27)"></a><font face="ARIAL"><font size="-1"><b>27)</b> Maroko PR, Radvany P,Braunwald E, Hale SL.Reduction of infarct size by oxigen inhalation following acute coronary occlusion. Circulation,1975;52:360-368.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724541&pid=S1409-4142200000030000800027&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="28)"></a><font face="ARIAL"><font size="-1"><b>28)</b> Madias JE, Hood WB . Reduction of precordial S T segment elevation in patients with anterior myocardial infarction by oxygen breathing. Circulation, 1976; 53 (Suppl) I-198-200.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724542&pid=S1409-4142200000030000800028&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="29"></a><font face="ARIAL"><font size="-1"><b>29)</b> Hennekens C H. Update on Aspirin in the treatment and prevention of cardiovascular disease. Am Heart J 1999;137:S9-13.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724543&pid=S1409-4142200000030000800029&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="30)"></a><font face="ARIAL"><font size="-1"><b>30)</b> ISIS-2 ( Second International Study of Infarct Survival) Collaborative Group.Randomised trial of intravenous Streptokinase,oral aspirin, both, or neither among 17187 cases of suspecteded acute myocardial infarction:ISIS-2. LANCET. 1988;2:349-360.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724544&pid=S1409-4142200000030000800030&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="31)"></a><font face="ARIAL"><font size="-1"><b>31)</b> Randomized double blind trial of fixed Low-dose Warfarin with Aspirin after Myocardial Infarction. Coumadin Aspirin Reinfarction Study ( CARS ) Investigators. Lancet 1997;350: 389-6.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724545&pid=S1409-4142200000030000800031&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="32)"></a><font face="ARIAL"><font size="-1"><b>32)</b> Herlitz J. Analgesia in Myocardial Infarction. Drugs 1989;37:939-944.</font></font> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=724546&pid=S1409-4142200000030000800032&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><a name="33)"></a><font face="ARIAL"><font size="-1"><b>33)</b> Martin G V, Kennedy J W. Choice of Thrombolytic agent. In: Julian DG,Braunwald E,eds. 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