<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1688-0420</journal-id>
<journal-title><![CDATA[Revista Uruguaya de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Urug.Cardiol.]]></abbrev-journal-title>
<issn>1688-0420</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Uruguaya de Cardiología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-04202014000200015</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Enfermedad coronaria estable]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Islam]]></surname>
<given-names><![CDATA[Shahed]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Timmis]]></surname>
<given-names><![CDATA[Adam]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,London Chest Hospital  ]]></institution>
<addr-line><![CDATA[London ]]></addr-line>
<country>UK</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2014</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>267</fpage>
<lpage>277</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-04202014000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-04202014000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-04202014000200015&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <div class="Section1">      <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Art&iacute;culo seleccionado&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;">&nbsp;<o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Almanac 2013: las Revistas de las Sociedades Nacionales presentan investigaciones seleccionadas que han determinado recientes avances en la cardiolog&iacute;a cl&iacute;nica&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""><b style=""> <span style="font-size: 14pt; font-family: Verdana; ">Enfermedad coronaria estable&nbsp;</span></b></p>       <p class="MsoNormal" style=""><b style=""><span style="font-size: 14pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></b></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Shahed Islam, Adam Timmis</span></p>       <p class="MsoNormal" style="">&nbsp;</p>       <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Este art&iacute;culo fue publicado en Heart 2013;0:1-6. doi:10.1136/heartjnl-2013-304593, y es reproducido y traducido con autorizaci&oacute;n&nbsp;</span></p>       ]]></body>
<body><![CDATA[<p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; ">NIHR Biomedical Research Unit, Barts and the London School of Medicine and Dentistry, London Chest Hospital, London, UK    <br>    Correspondencia: Profesor Adam Timmis, NIHR Biomedical Research Unit, Barts and the London School of Medicine and Dentistry, London Chest Hospital, London E2 9JX, UK.</span><o:p></o:p></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; ">    <br>    Recibido el 4 de julio de 2013    <br>    Aceptado el 13 de agosto de 2013&nbsp; </span> <o:p></o:p></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; "><o:p>&nbsp;</o:p></span></p>       <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Cardiopat&iacute;as coronarias en descenso&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         ]]></body>
<body><![CDATA[<p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">La informaci&oacute;n epidemiol&oacute;gica proveniente de Europa, Estados Unidos y del resto del mundo desarrollado muestra un abrupto descenso de la mortalidad por cardiopat&iacute;a coronaria (CHD, por su sigla en ingl&eacute;s) en los &uacute;ltimos 40 a&ntilde;os</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-1"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#1">1</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. La preocupaci&oacute;n existente en cuanto a la nivelaci&oacute;n de las tasas de mortalidad en los adultos m&aacute;s j&oacute;venes</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-2"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#2">2</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; "> ha sido en parte aliviada por los datos de Holanda, que muestran que en los hombres menores de 55 a&ntilde;os las tasas de declinaci&oacute;n se han vuelto a acelerar, aumentando de tan solo 16% en 1993-1999 a 46% en el per&iacute;odo 1999-2007</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-3"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#3">3</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Se ha observado un patr&oacute;n similar en las mujeres j&oacute;venes, con tasas de declinaci&oacute;n de 5% y 38% durante los mismos per&iacute;odos de tiempo. Esto es alentador particularmente en el contexto de los datos que llegan de Dinamarca y del Reino Unido, que muestran descensos en la mortalidad, as&iacute; como una abrupta ca&iacute;da de las tasas de incidencia normalizadas para el infarto agudo de miocardio, lo que indica que la prevenci&oacute;n coronaria, agregada al tratamiento en agudo, han contribuido a las tendencias recientes de mortalidad</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-4"></a><a name="-5"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#4">4</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#5">5</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Entre tanto, un estudio de Australia nos recuerda que el infarto de miocardio (IM) no es m&aacute;s que una de las varias manifestaciones de la enfermedad cardiovascular, ya que comunica que el descenso observado en las tasas de incidencia y recurrencia para los casos de CHD internados desde 2000 a 2007 tambi&eacute;n ha sido constatado para la enfermedad arterial perif&eacute;rica y cerebrovascular</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-6"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#6">6</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">No obstante ello, no todas las noticias epidemiol&oacute;gicas son buenas, y los datos del Reino Unido revelan que la relaci&oacute;n perniciosa entre el nivel socioecon&oacute;mico (NSE) y la CHD no ha mostrado ninguna tendencia a desaparecer en los &uacute;ltimos a&ntilde;os, los gradientes entre los grupos m&aacute;s alto y m&aacute;s bajo de los quintiles de NSE para los ingresos hospitalarios se mantienen en esencia inalterados en todo el espectro etario</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-7"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#7">7</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. No queda claro si esto ha contribuido al riesgo tres veces mayor de infarto agudo de miocardio asociado a &oacute;bito fetal y al riesgo nueve veces mayor asociado a p&eacute;rdidas recurrentes de embarazo comunicados en un estudio alem&aacute;n reciente, porque los investigadores no hicieron ning&uacute;n ajuste para NSE</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-8"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#8">8</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Tampoco queda claro si el NSE ha contribuido a la persistencia de las diferencias &eacute;tnicas de la mortalidad por CHD tanto en el estudio estadounidense como en el brit&aacute;nico, si bien hay otros factores que tambi&eacute;n parecen ser importantes. Por ende, los hombres afroamericanos tienen una mayor exposici&oacute;n a los factores de riesgo de CHD que los cauc&aacute;sicos, y, cuando se hacen los ajustes para este factor, su susceptibilidad a la CHD deja de ser mayor, aunque las tasas de mortalidad sean el doble</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-9"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#9">9</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Para las mujeres afroamericanas, las tasas de incidencia y mortalidad son superiores que para sus contrapartes cauc&aacute;sicas. Estos hallazgos, que sugieren que la exposici&oacute;n a los factores de riesgo contribuyen a las diferencias &eacute;tnicas en la incidencia de CHD, se reflejan hasta cierto punto en un informe reciente de la Encuesta Sanitaria en Inglaterra, en la que 13.293 cauc&aacute;sicos y 21.205 surasi&aacute;ticos dieron su consentimiento para que se les hiciera un seguimiento de su mortalidad</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-10"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#10">10</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. La inactividad f&iacute;sica fue m&aacute;s frecuente en los surasi&aacute;ticos en comparaci&oacute;n a los cauc&aacute;sicos (47% vs 28%) y explica el exceso mayor a 20% en su mortalidad por CHD. Existe un creciente consenso en cuanto a que el aumento de la mortalidad por CHD en la poblaci&oacute;n surasi&aacute;tica del Reino Unido se explica casi exclusivamente por un aumento de su susceptibilidad a la enfermedad y no por un aumento en las tasas de fatalidad de los casos</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-11"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#11">11</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><br style="">    <o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Diagn&oacute;stico de enfermedad coronaria estable&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">La reciente actualizaci&oacute;n de la gu&iacute;a de American Heart Association/American College of Cardiology (AHA/ACC)</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-12"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#12">12</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; "> destaca la importancia de individualizar los estudios de valoraci&oacute;n con base en la probabilidad estimada de coronariopat&iacute;a. En este sentido fue el espejo de una gu&iacute;a anterior del Instituto Nacional de Excelencia Cl&iacute;nica (NICE) sobre el diagn&oacute;stico de dolor tor&aacute;cico</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-13"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#13">13</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, pero hubo diferencias importantes en las recomendaciones para ex&aacute;menes no invasivos, la nueva gu&iacute;a de AHA/ACC aboga por el electrocardiograma (ECG) de esfuerzo como el mejor enfoque para el diagn&oacute;stico inicial en la mayor&iacute;a de los pacientes (previamente, NICE hab&iacute;a desaconsejado el uso del ECG de ejercicio porque su rendimiento diagn&oacute;stico era relativamente malo) reservando los radio nucle&oacute;tidos farmacol&oacute;gicos, la resonancia nuclear magn&eacute;tica (RNM) card&iacute;aca o las pruebas ecocardiogr&aacute;ficas de esfuerzo para pacientes que no pueden hacer ejercicio. Las recomendaciones para la angiograf&iacute;a coronaria por tomograf&iacute;a computada (TC) card&iacute;aca (CTCA, por su sigla en ingl&eacute;s) fueron cautelosas, y se recomend&oacute; realizar angiograf&iacute;a invasiva con fines diagn&oacute;sticos solo si los resultados de las pruebas no invasivas suger&iacute;an una alta probabilidad de una enfermedad de tres vasos severa o enfermedad del tronco de la coronaria izquierda, y si el paciente estaba dispuesto a someterse a revascularizaci&oacute;n. Por lo tanto, en t&eacute;rminos generales la actualizaci&oacute;n de la gu&iacute;a AHA/ACC fue menos prescriptiva que la gu&iacute;a anterior de NICE, quiz&aacute;, en parte, porque pon&iacute;a menos &eacute;nfasis en la relaci&oacute;n costo-eficacia de sus recomendaciones.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p>&nbsp;</o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Manejo de la enfermedad coronaria estable&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">La gu&iacute;a reciente de NICE</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-14"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#14">14</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; "> recomendaba un tratamiento inicial con un nitrato de corta acci&oacute;n y un betabloqueante y/o un bloqueador de los canales de calcio para el control de la angina, adem&aacute;s de aspirina y una estatina para prevenci&oacute;n secundaria. Tambi&eacute;n se enfatizaba en las medidas vinculadas al estilo de vida. Para los pacientes con s&iacute;ntomas persistentes se recomend&oacute; el cateterismo card&iacute;aco con vistas a la revascularizaci&oacute;n, quedando el tratamiento antianginoso adicional (nitratos de acci&oacute;n prolongada o uno de los agentes m&aacute;s nuevos) indicado solamente para los pacientes que no son adecuados para la revascularizaci&oacute;n. Se recomend&oacute; adem&aacute;s que ser&iacute;a mejor que el modo de revascularizaci&oacute;n (procedimientos coronarios percut&aacute;neos [PCI], por su sigla en ingl&eacute;s) contra la cirug&iacute;a de injerto de derivaci&oacute;n de arterias coronarias (IDAC o CABG, por su sigla en ingl&eacute;s) fuera determinado por un grupo multidisciplinario, una recomendaci&oacute;n que tambi&eacute;n ha sido destacada por los grupos de gu&iacute;as europeas</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-15"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#15">15</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, teniendo en cuenta el potencial beneficio pron&oacute;stico del CABG en pacientes con enfermedad compleja de m&uacute;ltiples vasos y del tronco coronario izquierdo, particularmente en aquellos con diabetes</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-16"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#16">16</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Para los pacientes con s&iacute;ntomas controlados adecuadamente con tratamiento m&eacute;dico, la gu&iacute;a recomendaba analizar el potencial de una mejora pron&oacute;stica con CABG. A los pacientes preparados para proceder con CABG se les podr&iacute;a ofrecer entonces el cateterismo card&iacute;aco diagn&oacute;stico para descartar enfermedad compleja de m&uacute;ltiples vasos y del tronco coronario izquierdo, los cuales han sido reportados en un reciente metaan&aacute;lisis hasta en un 36% (18,5%-48,8%) de los casos de enfermedad coronaria estable seleccionados para cateterismo card&iacute;aco</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-17"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#17">17</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         ]]></body>
<body><![CDATA[<p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p>&nbsp;</o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Prevenci&oacute;n secundaria de la enfermedad coronaria estable&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Hay dos informes recientes que destacan la importancia de mejorar la prevenci&oacute;n secundaria en pacientes con coronariopat&iacute;as estables. En el Registro REACH (The multinational REduction of Atherothrombosis for Continued Health) se analizaron 20.588 pacientes sintom&aacute;ticos para determinar el &ldquo;buen control&rdquo; de los factores de riesgo cardiovascular, definido como tres de cinco factores, a saber: presi&oacute;n arterial sist&oacute;lica &lt;140 mm Hg, presi&oacute;n arterial diast&oacute;lica &lt;90 mm Hg, glicemia en ayunas &lt;110 mg/dl, colesterol total &lt;200 mg/dl, y ausencia de tabaquismo</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-18"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#18">18</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Solo 59,4% ten&iacute;an un buen control de los factores de riesgo al inicio, pero esto se asoci&oacute; con una menor mortalidad (OR 0,89; IC 95% 0,79 a 0,99) a los 36 meses, comparado con un mal control. En la encuesta del Reino Unido, ASPIRE- 2-PREVENT, 676 pacientes con CHD (25,6% mujeres) tuvieron las siguientes tasas de estos factores de riesgo mayores: tabaquismo 14,1%, obesidad 38%, inactividad f&iacute;sica 83,3%, presi&oacute;n arterial &sup3;130/80 mm de Hg, colesterol total &sup3;4 mmol/l y diabetes 17,8%, lo que llev&oacute; a los autores a concluir que hay un potencial considerable de reducci&oacute;n de riesgo cardiovascular en estos pacientes y mejorar as&iacute; su pron&oacute;stico</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-19"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#19">19</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;">&nbsp;<o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">Clopidogrel.</span><span style="font-size: 10pt; font-family: Verdana; "> La disponibilidad de clopidogrel gen&eacute;rico de bajo costo motiv&oacute; una revisi&oacute;n de NICE de su relaci&oacute;n costo/efectividad, y pas&oacute; a recomendar que ahora deber&iacute;a suplantar a la aspirina en ciertos grupos de alto riesgo, fundamentalmente en pacientes con enfermedad de m&uacute;ltiples vasos, vasculopat&iacute;a perif&eacute;rica e IM</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-20"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#20">20</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Sin embargo, el clopidogrel es metabolizado por enzimas del sistema hep&aacute;tico de citocromo P450 (CYP), y su actividad antiplaquetaria puede variar debido a la actividad de estas enzimas, dependiendo de variaciones gen&eacute;ticas comunes y tambi&eacute;n de una serie de f&aacute;rmacos usados habitualmente. Varios estudios han comunicado alelos que determinan p&eacute;rdida de funci&oacute;n en CYP2C19, que reducen la activaci&oacute;n del clopidogrel</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-21"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#21">21</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; "> produciendo un modesto descenso de la actividad antiplaquetaria</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-22"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#22">22</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, lo que ha sido asociado con un aumento del riesgo de eventos cardiovasculares en algunos metaan&aacute;lisis</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-23"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#23">23</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. A la inversa, los alelos que determinan una ganancia de funci&oacute;n se han asociado con una reducci&oacute;n del riesgo cardiovascular entre los pacientes tratados con clopidogrel</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-24"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#24">24</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Sin embargo, un metaan&aacute;lisis reciente resalta la tendencia que tienen los estudios peque&ntilde;os a llegar a conclusiones sesgadas en cuanto a incidencia de las variantes gen&eacute;ticas sobre los resultados cl&iacute;nicos, y en los estudios de mayor tama&ntilde;o del tratamiento con clopidogrel &sup3;200 eventos no encontraron ning&uacute;n efecto de los alelos que determinen p&eacute;rdida de la funci&oacute;n sobre el riesgo cardiovascular</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-25"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#25">25</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. A la fecha, por lo tanto, no parece haber ninguna indicaci&oacute;n convincente para realizar pruebas gen&eacute;ticas para orientar el tratamiento con clopidogrel, si bien ese es un tema que sigue siendo debatido. Otro tema discutido es el de la interacci&oacute;n de clopidogrel con algunos medicamentos comunes, particularmente con los inhibidores de la bomba de protones (IBP) y la amlodipina. Un metaan&aacute;lisis reciente de los estudios de los IBP en pacientes tratados con clopidogrel puso de manifiesto evidencias claras de una reducci&oacute;n de la actividad de las plaquetas, pero si bien los resultados cl&iacute;nicos aparecieron como adversamente afectados por la interacci&oacute;n, los autores instan a ser cautelosos a la hora de hacer interpretaciones, destacando la heterogeneidad de la que adolecen los estudios retrospectivos. Al limitar el an&aacute;lisis a los estudios prospectivos de los IBP y clopidogrel, ya no fue posible demostrar consecuencias cl&iacute;nicas adversas (OR 1,13 [0,98 a 1,30])</span><sup><span style="font-size: 10pt; font-family: Verdana; "> <a name="-26"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#26">26</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Asimismo, el impacto cl&iacute;nico de la amlodipina sobre la capacidad de respuesta al clopidogrel sigue siendo incierto. En efecto, hay evidencia de interacci&oacute;n, y en un estudio de 1.258 pacientes que recib&iacute;an clopidogrel, la administraci&oacute;n de amlodipina se acompa&ntilde;&oacute; de una mayor reactividad de las plaquetas durante el tratamiento solo en aquellos pacientes en los que se ve&iacute;a el genotipo de p&eacute;rdida de funci&oacute;n de P450 (CYP) (249 &plusmn; 83 vs 228 &plusmn; 84 unidades de reacci&oacute;n de P2Y12), y esto se asoci&oacute; con una mayor incidencia de eventos cardiovasculares (4,6% vs 0,6%)</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-27"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#27">27</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Sin embargo, en un ensayo aleatorizado m&aacute;s reciente, la funci&oacute;n plaquetaria de 98 pacientes con coronariopat&iacute;a estable que estaban recibiendo clopidogrel fue similar, independientemente del tratamiento con amlodipina</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-28"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#28">28</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Actualmente, por lo tanto, no hay ninguna recomendaci&oacute;n en la gu&iacute;a referente a la prescripci&oacute;n concomitante de estos medicamentos en los pacientes que est&aacute;n recibiendo clopidogrel.&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">Estatinas, niacina e inhibidores de la prote&iacute;na de transferencia del &eacute;ster de colesteril (CETP).</span><span style="font-size: 10pt; font-family: Verdana; "> Los beneficios de las estatinas para la prevenci&oacute;n secundaria en pacientes con enfermedad coronaria estable est&aacute;n bien establecidos. Los puntos cardiovasculares duros se reducen proporcionalmente al grado de reducci&oacute;n de LDL-colesterol, probablemente en respuesta a la estabilizaci&oacute;n y regresi&oacute;n de la placa ateromatosa. Mediante ex&aacute;menes seriados de IVUS realizados recientemente en 1.039 pacientes con enfermedad coronaria estable aleatorizados a recibir rosuvastatina 40 mg o atorvastatina 80 mg diariamente, se confirm&oacute; que las placas pueden sufrir regresi&oacute;n</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-29"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#29">29</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. El volumen ateromatoso durante el per&iacute;odo de seguimiento de dos a&ntilde;os disminuy&oacute; un promedio de alrededor de 1% en ambos grupos, lo que es m&aacute;s que lo informado previamente con esquemas de menor intensidad de tratamiento con estatinas. Sin embargo, los beneficios cl&iacute;nicos adicionales de la niacina han sido descartados ahora inequ&iacute;vocamente en el ensayo AIM-HIGH, en el que se distribuyeron aleatoriamente 3.414 pacientes con enfermedad cardiovascular estable que estaban tomando estatinas, para recibir niacina (n=1.718) o placebo (n=1.696)</span><sup><span style="font-size: 10pt; font-family: Verdana; "> <a name="-30"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#30">30</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Si bien la niacina aument&oacute; significativamente el HDL colesterol y baj&oacute; los triglic&eacute;ridos, las diferencias en las variables evaluables primarias (un compuesto de eventos coronarios adversos, accidentes cerebrovasculares y revascularizaci&oacute;n) fueron despreciables, apareciendo en 16% de los pacientes de cada grupo. El ensayo fue interrumpido despu&eacute;s de un seguimiento promedio de tres a&ntilde;os al quedar claro que el tratamiento que eleva el HDL con niacina fue cl&iacute;nicamente ineficaz. Todas las esperanzas del tratamiento de elevaci&oacute;n del HDL se depositan ahora en los inhibidores de la CETP, y pese a las inquietudes de seguridad que surgieron con el ensayo ILLUMINATE de torcetrapib</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-31"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#31">31</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, en el que el tratamiento se asoci&oacute; con un aumento de la mortalidad a pesar de haberse obtenido elevaciones importantes de HDL, otros inhibidores de CETP est&aacute;n ingresando ahora a ensayos fase III. Un ensayo aleatorizado reciente con dalcetrapib en pacientes con s&iacute;ndromes coronarios agudos fue decepcionante, no logrando demostrar una reducci&oacute;n del riesgo de eventos coronarios recurrentes pese a un aumento &gt;30% de los niveles de HDL en el grupo de tratamiento</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-32"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#32">32</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Un ensayo de eficacia y seguridad de anacetrapib en pacientes con enfermedad coronaria estable o con un alto riesgo de contraerla fue favorable, aunque no tuviera potencia como para medir los resultados cl&iacute;nicos</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-33"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#33">33</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, y evacetrapib ha ingresado ahora a la escena con un estudio reciente que muestra una elevaci&oacute;n eficaz de HDL sin los efectos adversos sobre la presi&oacute;n arterial observados con torcetrapib y, en menor grado, con dalcetrapib</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-34"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#34">34</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Sin embargo, todav&iacute;a no se sabe si alguno de estos inhibidores de CETP mejorar&aacute;n los resultados cl&iacute;nicos.&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">F&aacute;rmacos novedosos hipolipemiantes en la translaci&oacute;n cl&iacute;nica.</span><span style="font-size: 10pt; font-family: Verdana; "> Aun combinadas con LDLf&eacute;resis, las terapias hipolipemiantes convencionales son a menudo insuficientes para tratar, seg&uacute;n las metas de las gu&iacute;as, a los pacientes con hipercolesterolemia familiar (HF), un trastorno autos&oacute;mico dominante del metabolismo lip&iacute;dico asociado con la enfermedad coronaria acelerada</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-35"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#35">35</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Por ende, hay mucho inter&eacute;s en ciertas nuevas terapias que est&aacute;n actualmente en estudio, particularmente la lomitapida, un inhibidor oral de los anticuerpos monoclonales contra PCSK9 y la prote&iacute;na de transferencia micros&oacute;mica. Un estudio fase II de lomitapida en HF homocigotas mostr&oacute; una reducci&oacute;n de 50% del LDL-colesterol y si bien fueron frecuentes los efectos colaterales gastrointestinales, parece probable que la droga tenga un papel &uacute;til en estos pacientes homocigotos</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-36"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#36">36</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Los inhibidores de PCSK9 tambi&eacute;n han producido reducciones de 50%-60% en los valores de LDL-colesterol en los estudios cl&iacute;nicos al agregarse a las estatinas y ezetimiba, pero a diferencia de la lomitapida, son probablemente efectivos fundamentalmente en los pacientes con HF heterocigotas porque act&uacute;an interfiriendo con los receptores de LDL que son disfuncionales o est&aacute;n completamente ausentes en los homocigotas</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-37"></a><a name="-38"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#37">37</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#38">38</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. La expectativa es que la aplicaci&oacute;n de estos nuevos f&aacute;rmacos permita a la mayor&iacute;a de los pacientes con HF alcanzar las concentraciones meta de LDL colesterol. Un importante componente del manejo de la HF incluye la identificaci&oacute;n de otros miembros de la familia afectados, se ha comunicado que el tamizaje en cascada usando las pruebas gen&eacute;ticas es eficaz desde el punto de vista de los costos</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-39"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#39">39</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Sin embargo, la evidencia reciente sugiere que hay trastornos polig&eacute;nicos responsables de una proporci&oacute;n apreciable de casos de HF</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-40"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#40">40</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, y esto limitar&iacute;a la efectividad del tamizaje en cascada a los parientes de los casos positivos para mutaciones (monog&eacute;nicos). En otros pacientes con niveles de colesterol congruentes con un genotipo de HF, las estrategias m&aacute;s convencionales de atenci&oacute;n primaria deber&iacute;an seguir siendo la herramienta de elecci&oacute;n de tamizaje</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-41"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#41">41</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, por lo menos por el momento.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         ]]></body>
<body><![CDATA[<p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p>&nbsp;</o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Revascularizaci&oacute;n en la coronaropat&iacute;a estable&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">Intervenci&oacute;n coronaria percut&aacute;nea.</span><span style="font-size: 10pt; font-family: Verdana; "> El ensayo COURAGE fue un importante elemento de cambio al mostrar que la colocaci&oacute;n de pr&oacute;tesis coronarias en pacientes con angina estable no mejor&oacute; los resultados cardiovasculares comparado con la terapia m&eacute;dica &oacute;ptima (TMO), en tanto que los beneficios sobre la calidad de vida fueron de corta duraci&oacute;n</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-42"></a><a name="-43"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#42">42</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#43">43</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>Actualmente hay un metaan&aacute;lisis que compara la terapia m&eacute;dica contempor&aacute;nea y PCI en ocho ensayos aleatorizados en los que participaron 7.229 pacientes con CHD estable</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-44"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#44">44</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Aqu&iacute; tambi&eacute;n los resultados cardiovasculares entre los grupos fueron similares durante el seguimiento que se extendi&oacute; en un promedio de 4,3 a&ntilde;os sin ning&uacute;n beneficio cl&iacute;nicamente significativo para PCI, riesgos de muerte (8,9% vs 9,1%) e IM no fatal (8,9% vs 8,1%), siendo casi id&eacute;nticos a la terapia m&eacute;dica, en tanto que las diferencias en la revascularizaci&oacute;n no planificada (21,4% vs 30,7%) y angina persistente (29% vs 33%) fueron peque&ntilde;os e insignificantes. La informaci&oacute;n apoya las recomendaciones de la gu&iacute;a reciente para el tratamiento de angina estable (ver arriba), y han sido utilizados para cuestionar a los cl&iacute;nicos que siguen planteando la conveniencia de PCI a los pacientes que no recibieron TMO</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-45"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#45">45</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>Sin embargo, el ensayo FAME-II apoya en cierta medida el enfoque de intervenci&oacute;n temprana en una comparaci&oacute;n aleatorizada de TMO y PCI usando pr&oacute;tesis liberadoras de f&aacute;rmacos guiadas seg&uacute;n la reserva de flujo fraccional (RFF)</span><sup><span style="font-size: 10pt; font-family: Verdana; "> <a name="-46"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#46">46</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>El estudio fue interrumpido 17 meses antes de lo planificado porque la variable evaluable compuesta (mortalidad por todas las causas, IM no fatal, revascularizaci&oacute;n urgente) apareci&oacute; en 4,3% del grupo PCI comparado con 12,7% del grupo no sometido a PCI (TMO). El alivio de la angina tambi&eacute;n fue m&aacute;s efectivo en el grupo de PCI. Los procedimientos PCI guiados por RFF ya se han transformado en una estrategia recomendada en la enfermedad coronaria estable, pero hay autores que opinan que esto es prematuro</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-47"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#47">47</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. De hecho, la diferencia de tratamiento en FAME-II fue impulsada &uacute;nicamente por una reducci&oacute;n en una revascularizaci&oacute;n urgente (49 en el grupo de TMO solo; 7 en el grupo de RFF-PCI (HR=0,13, IC 95% 0,06 a 0,30), mientras que las 33 muertes e IM no fatales se distribuyeron de una manera bastante pareja entre los grupos. Adem&aacute;s, la mayor&iacute;a de los pacientes sometidos a revascularizaci&oacute;n &ldquo;urgente&rdquo; carec&iacute;an de elementos objetivos de isquemia de alto riesgo o elevaciones umbral de biomarcadores, planteando preocupaciones sobre la selecci&oacute;n sesgada de los pacientes para el manejo invasivo durante el seguimiento. Sin embargo, el argumento a favor del manejo intervencionista como estrategia inicial en la angina estable ha sido fortalecido indudablemente por FAME-II, pero las respuestas finales al debate tal vez tengan que esperar hasta que se disponga de los resultados del Estudio Internacional ISCHEMIA (International Study of Comparative Health Effectiveness con Medical and Invasive Approaches en curso; ClinicalTrials.gov n&uacute;mero NCT 01471522), que compara los efectos de revascularizaci&oacute;n (PCI o CABG) combinado con TMO, con TMO solo sobre la muerte cardiovascular, o IM en los pacientes con CAD estable, y evidencia objetiva de isquemia mioc&aacute;rdica.&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">Cirug&iacute;a de derivaci&oacute;n coronaria.</span><span style="font-size: 10pt; font-family: Verdana; "> Las gu&iacute;as estadounidenses actualizadas</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-48"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#48">48</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; "> han respaldado la recomendaci&oacute;n de NICE de un enfoque de equipo multidisciplinario para adoptar decisiones de revascularizaci&oacute;n en pacientes con enfermedad coronaria compleja, alentando la aplicaci&oacute;n de SYNTAX y otros sistemas de puntuaci&oacute;n para llegar a una decisi&oacute;n apropiada</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-49"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#49">49</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. El potencial que tiene CABG comparado con PCI de mejorar el pron&oacute;stico en pacientes con CHD del tronco de la coronaria izquierda y de m&uacute;ltiples vasos est&aacute; apoyado por estudios de cohorte recientes</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-50"></a><a name="-51"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#50">50</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#51">51</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">; actualmente se dispone de datos de un seguimiento de cinco a&ntilde;os de SYNTAX en el que los eventos adversos card&iacute;acos y cerebrovascular mayores (MACCE) fueron 26,9% en el grupo de CABG y 37,3% en el grupo de PCI, en gran medida impulsado por tasas m&aacute;s bajas de IM no fatal y la repetici&oacute;n de la revascularizaci&oacute;n para CABG, sin una diferencia importante en la mortalidad por todas las causas y el accidente cerebrovascular comparado con PCI</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-52"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#52">52</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Los beneficios de CABG fueron particularmente evidentes en pacientes con puntuaciones intermedias y altas de SYNTAX, no habiendo una diferencia significativa en los resultados entre las estrategias de revascularizaci&oacute;n para pacientes con puntuaciones bajas de SYNTAX. Todas las preguntas sobre la estrategia preferida de revascularizaci&oacute;n en pacientes con diabetes y enfermedad coronaria de m&uacute;ltiples vasos han sido respondidas por el ENSAYO FREEDOM, que distribuy&oacute; aleatoriamente a 1.900 pacientes bajo TMO, ya sea a PCI con pr&oacute;tesis liberadoras de f&aacute;rmacos o CABG</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-53"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#53">53</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Despu&eacute;s de un seguimiento con una mediana de 3,8 a&ntilde;os, el resultado primario, un compuesto de muerte por cualquier causa, infarto de miocardio no fatal, o accidente cerebrovascular no fatal, ocurri&oacute; en 26,6% del grupo de PCI y en 18,7% del grupo de CABG. Los autores concluyeron que CABG es superior a PCI en pacientes con diabetes y enfermedad de m&uacute;ltiples vasos. Hay menos certeza sobre la estrategia de revascularizaci&oacute;n preferida en la enfermedad del tronco coronario izquierdo; los investigadores de SYNTAX comunican resultados similares para PCI y CABG, un hallazgo congruente con otros estudios contempor&aacute;neos que identifican la colocaci&oacute;n de pr&oacute;tesis como una estrategia razonable en casos correctamente seleccionados, aun cuando la necesidad de repetir la revascularizaci&oacute;n es casi invariablemente m&aacute;s elevada comparado con CABG</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-54"></a><a name="-55"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#54">54</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#55">55</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">En los &uacute;ltimos tiempos la t&eacute;cnica quir&uacute;rgica ha estado bajo la lupa. Las inquietudes sobre los posibles efectos adversos de la extracci&oacute;n de vena safena abierta comparado con la extracci&oacute;n por v&iacute;a endosc&oacute;pica se han basado fundamentalmente en un estudio de cohorte no aleatorizado de 1.817 pacientes en quienes se observaron tasas de falla del injerto venoso al a&ntilde;o de 47% vs 38%, y las tasas de muerte, infarto de miocardio o revascularizaci&oacute;n a los tres a&ntilde;os de 20,2% vs 17,4% en la extracci&oacute;n de vena safena abierta comparado con la extracci&oacute;n por v&iacute;a endosc&oacute;pica</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-56"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#56">56</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Esto llev&oacute; a NICE a recomendar cautela en el uso de la t&eacute;cnica endosc&oacute;pica</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-57"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#57">57</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, pero esas inquietudes ahora han sido apaciguadas por los resultados de dos grandes estudios de cohorte. En un estudio realizado enEstados Unidos de 235.394 pacientes de Medicare con CABG de la Sociedad de Cirujanos Tor&aacute;cicos (STS), las tasas de mortalidad de la base de datos nacional fueron similares independientemente de la t&eacute;cnica de extracci&oacute;n, mientras que las tasas de complicaciones del lugar de la extracci&oacute;n fueron m&aacute;s bajas para la t&eacute;cnica endosc&oacute;pica</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-58"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#58">58</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Un estudio hecho en el Reino Unido con 4.702 pacientes con CABG describe hallazgos similares sin diferencias en la mortalidad intrahospitalaria (0,9% vs 1,1%, p=0,71) o mortalidad a medio plazo (HR 1,04; IC 95% 0,65 a 1,66) para la extracci&oacute;n endosc&oacute;pica comparado con la extracci&oacute;n a vena abierta</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-59"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#59">59</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Tambi&eacute;n se han estado estudiando los beneficios relativos de CABG con bomba y sin bomba. Cada uno tiene sus proponentes</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-60"></a><a name="-61"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#60">60</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#61">61</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, pero los resultados de los ensayos aleatorizados no lograron mostrar una ventaja clara de CABG sin bomba. Los resultados a tres a&ntilde;os del ensayo Best Bypass Surgery no muestran una diferencia significativa en el resultado compuesto primario de MACCE comparado con CABG con bomba, excepto por una tendencia hacia una mayor mortalidad</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-62"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#62">62</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>Esto puede reflejar, por lo menos, diferencias en las tasas de permeabilidad del injerto a favor de los procedimientos con bomba; el ensayo ROOBY informa tasas de 91,4% vs 85,8% para los injertos arteriales y 80,4% vs 72,7% para los injertos de safena en los pacientes con bomba comparado con los pacientes sin bomba</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-63"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#63">63</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Ha sido particularmente decepcionante la incapacidad de la cirug&iacute;a sin bomba para reducir el da&ntilde;o cerebral, pero la comparaci&oacute;n aleatorizada que coteja la circulaci&oacute;n extracorp&oacute;rea m&iacute;nima (MECC, por su sigla en ingl&eacute;s) con la convencional (CECC) en 64 pacientes sometidos a CABG ha sido m&aacute;s promisoria</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-64"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#64">64</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>MECC se acompa&ntilde;&oacute; de un mejor transporte cerebral de ox&iacute;geno durante la cirug&iacute;a y el desempe&ntilde;o neurocognitivo a los tres meses fue mejor que con CECC.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p>&nbsp;</o:p></span></p>         ]]></body>
<body><![CDATA[<p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Preacondicionamiento isqu&eacute;mico remoto para el tratamiento de la enfermedad coronaria estable&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Sus proponentes ven el preacondicionamiento isqu&eacute;mico remoto (RIPC) como un medio &uacute;til y econ&oacute;mico de mejorar los resultados en toda una serie de trastornos cardiovasculares. Por lo tanto, deben estar frustrados porque la t&eacute;cnica no ha logrado incorporarse a la pr&aacute;ctica cl&iacute;nica debido a informes contradictorios con respecto a su eficacia y una incertidumbre en cuanto a la mec&aacute;nica, todo lo cual se combina para minar la confianza cl&iacute;nica en cuanto a la utilidad de RIPC. Algunos ensayos aleatorizados recientes han sido favorables, habi&eacute;ndose comunicado una protecci&oacute;n contra la nefropat&iacute;a inducida por el contraste durante el cateterismo card&iacute;aco</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-65"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#65">65</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; "> y reducci&oacute;n de la lesi&oacute;n mioc&aacute;rdica durante la cirug&iacute;a card&iacute;aca valvular</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-66"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#66">66</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Tal vez el m&aacute;s favorable haya sido un ensayo de aleatorizaci&oacute;n de RIPC prehospitalaria en 333 pacientes con STEMI sometidos a PCI primaria</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-67"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#67">67</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. El grupo con RIPC mostr&oacute; una mejora significativa en el &iacute;ndice de rescate mioc&aacute;rdico comparado con el grupo sin RIPC (0,75 vs 0,55), si bien el ensayo no ten&iacute;a el poder estad&iacute;stico necesario para los eventos coronarios. Contra esto se debe mencionar un ensayo negativo de RIPC en un grupo de pacientes sometidos a CABG</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-68"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#68">68</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, pero es improbable que esta sea la &uacute;ltima palabra. Un metaan&aacute;lisis de nueve estudios que incluyeron a 704 pacientes ha concluido que RIPC reduce significativamente la liberaci&oacute;n de troponina durante el procedimiento CABG</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-69"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#69">69</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>Entre los estudios mecanicistas de inter&eacute;s se incluye un estudio cruzado en pacientes con coronariopat&iacute;a estable en el que RIPC redujo la activaci&oacute;n de las plaquetas durante las pruebas de ejercicio sin proteger contra los cambios isqu&eacute;micos del ECG</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-70"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#70">70</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>En otro estudio del flujo de sangre del antebrazo usando pletismograf&iacute;a venosa en voluntarios sanos, se observ&oacute; que RIPC proteg&iacute;a contra la alteraci&oacute;n de la funci&oacute;n vasomotora dependiente del endotelio inducida por la isquemia</span><sup><span style="font-size: 10pt; font-family: Verdana; ">(<a name="-71"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#71">71</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>No obstante ello, esta protecci&oacute;n no se vio afectada por la infusi&oacute;n de un antagonista de los receptores de bradiquinina B2, llevando a los autores a concluir que la bradiquinina no es un mediador de RIPC.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p>&nbsp;</o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Biomarcadores pron&oacute;sticos en la CHD estable&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">Biomarcadores circulantes</span><span style="font-size: 10pt; font-family: Verdana; "><span style="font-weight: bold;">.</span> Nunca antes ha sido tan alto el inter&eacute;s por los biomarcadores cardiovasculares circulantes y por ende se han elaborado documentos metodol&oacute;gicos para alertar a los investigadores de las normas que es preciso respetar para poder evaluar bien su utilidad pron&oacute;stica</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-72"></a><a name="-73"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#72">72</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#73">73</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Sin embargo, una revisi&oacute;n sistem&aacute;tica de 83 estudios de CRP fue cr&iacute;tica en cuanto a su calidad general y concluy&oacute; que &ldquo;dados los m&uacute;ltiples tipos de sesgo de comunicaci&oacute;n y publicaci&oacute;n, la magnitud de cualquier asociaci&oacute;n independiente entre CRP y el pron&oacute;stico entre los pacientes con enfermedad coronaria estable es suficientemente incierta como para que no se puedan hacer recomendaciones para la pr&aacute;ctica cl&iacute;nica&rdquo;</span><sup><span style="font-size: 10pt; font-family: Verdana; "> <a name="-74"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#74">74</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Los mismos autores fueron igualmente cr&iacute;ticos de los 19 estudios sobre BNP en pacientes con coronariopat&iacute;a estable, sosteniendo que en general no se dispon&iacute;a de medidas cl&iacute;nicamente &uacute;tiles de predicci&oacute;n y discriminaci&oacute;n, y conclu&iacute;an que no queda clara la fortaleza no sesgada de la asociaci&oacute;n de BNP con el pron&oacute;stico de la enfermedad coronaria estable</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-75"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#75">75</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>La existencia de ensayos de alta sensibilidad ha renovado el inter&eacute;s por las troponinas como marcadores de riesgo en la enfermedad coronaria estable. Seg&uacute;n el Estudio Heart and Soul realizado en Estados Unidos con 984 pacientes, cada duplicaci&oacute;n en el nivel de hs-cTnT se asocia con una tasa 37% m&aacute;s alta de eventos cardiovasculares</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-76"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#76">76</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>Mientras tanto, los investigadores de PEACE han comunicado que en 3.623 pacientes con coronariopat&iacute;a estable, hs-cTnT est&aacute; asociada independientemente con muerte cardiovascular o insuficiencia card&iacute;aca (HR 1,88 [1,33 a 2,66; p &lt;0,001]), siendo m&aacute;s d&eacute;bil la asociaci&oacute;n con el IM no fatal (1,03 a 2,01; p = 0,031)</span><sup><span style="font-size: 10pt; font-family: Verdana; "> <a name="-77"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#77">77</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>La evidencia de CTCA sugiere que una ruptura cl&iacute;nicamente silente de la placa no calcificada con microembolizaci&oacute;n ulterior es un mecanismo fisiopatol&oacute;gico probable de la elevaci&oacute;n de la troponina<a name="-78"></a></span><sup><span style="font-size: 10pt; font-family: Verdana; ">(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#78">78</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">, pero es demasiado temprano para saber si tendr&aacute; un papel en la cl&iacute;nica para la valoraci&oacute;n del pron&oacute;stico de la enfermedad coronaria estable. Lo mismo se aplica a la porci&oacute;n de la regi&oacute;n media de la pro adrenomedulina y otros biomarcadores que se est&aacute;n estudiando actualmente</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-79"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#79">79</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">Biomarcadores vasculares</span><span style="font-size: 10pt; font-family: Verdana; "><span style="font-weight: bold;">.</span> El espesor de la &iacute;ntima media de la car&oacute;tida (cIMT) est&aacute; bien establecido como predictor de los eventos cardiovasculares en la poblaci&oacute;n general y, en menor grado, en pacientes con coronariopat&iacute;a estable</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-80"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#80">80</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>Su valor predictivo puede verse mejorado si adem&aacute;s se considera la extensi&oacute;m de la placa carot&iacute;dea que permite derivar la &ldquo;puntuaci&oacute;n de la carga total&rdquo;; investigadores chinos demostraron que mejora la predicci&oacute;n de las variables evaluables del riesgo cardiovascular a cinco a&ntilde;os con cIMT solo</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-81"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#81">81</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>Ciertamente, el valor de cIMT solo para predicci&oacute;n del riesgo cardiovascular en la poblaci&oacute;n general est&aacute; bajo cuestionamiento luego de un gran metaan&aacute;lisis de datos a nivel de participantes en 45.828 individuos en los que cIMT no agreg&oacute; pr&aacute;cticamente nada a la puntuaci&oacute;n de riesgo de Framingham</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-82"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#82">82</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Otro metaan&aacute;lisis de los datos a nivel de los participantes, que inclu&iacute;a a 36.984 individuos seguidos durante un promedio de siete a&ntilde;os, ha planteado m&aacute;s interrogantes</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-83"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#83">83</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Los investigadores no mostraron ninguna asociaci&oacute;n entre la progresi&oacute;n de cIMT y el riesgo de eventos cardiovasculares, cuestionando la validez de usar los cambios en cIMT como variable evaluable sustituta en los ensayos del riesgo cardiovascular.&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         ]]></body>
<body><![CDATA[<p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; font-weight: bold">Calcio y hormona paratiroidea</span><span style="font-size: 10pt; font-family: Verdana; "><span style="font-weight: bold;">.</span> Hay estudios que sugieren que los individuos que consumen suplementos de calcio pueden tener un aumento del riesgo de infarto de miocardio</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-84"></a><a name="-85"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#84">84</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#85">85</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">; eso ha estimulado el inter&eacute;s en la calcemia y su relaci&oacute;n con los eventos cardiovasculares en los pacientes con CHD. Un estudio reciente ha confirmado que la vitamina D, la hormona paratiroidea y el calcio muestran una asociaci&oacute;n con los factores de riesgo cardiovascular en los adolescentes estadounidenses</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-86"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#86">86</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">,<sup> </sup>y a la fecha tenemos datos en 1.017 pacientes con coronariopat&iacute;a estable, seguidos durante una mediana de 8,1 a&ntilde;os, que sugieren que los niveles elevados de calcio (pero no as&iacute; los de fosfatos) pueden asociarse con la mortalidad cardiovascular y mortalidad por todas las causas (HR 2,39 a 4,66</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-87"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#87">87</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">). No queda claro cu&aacute;l es el mecanismo de esta asociaci&oacute;n, pero la demostraci&oacute;n en la misma cohorte de una asociaci&oacute;n similar entre una hormona paratiroidea elevada y la mortalidad cardiovascular puede implicar la movilizaci&oacute;n de calcio del hueso como parte del mecanismo de acci&oacute;n</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-88"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#88">88</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p>&nbsp;</o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Colaboradores: SI y AT contribuyeron por igual a la preparaci&oacute;n y redacci&oacute;n de este art&iacute;culo de revisi&oacute;n.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Conflicto de intereses: ninguno.&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p>&nbsp;</o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; ">Bibliograf&iacute;a&nbsp;</span></p>       <p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="1"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-1">1</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Nabel EG, Braunwald E.</span> A tale of coronary artery disease and myocardial infarction. N Engl J Med 2012;366:54-63.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         ]]></body>
<body><![CDATA[<!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="2"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-2">2</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Briffa T, Nedkoff L, Peeters A, et al. </span>Discordant age and sex-specific trends in the incidence of a first coronary heart disease event in Western Australia from 1996 to 2007. Heart 2011;97:400-4.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="3"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-3">3</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Vaartjes I, O&rsquo;Flaherty M, Grobbee DE, et al.</span> Coronary heart disease mortality trends in the Netherlands 1972-2007. Heart 2011;97:569-73.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="4"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-4">4</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Schmidt M, Jacobsen JB, Lash TL, et al.</span> 25 year trends in first time hospitalisation for acute myocardial infarction, subsequent short and long term mortality, and the prognostic impact of sex and comorbidity: a Danish nationwide cohort study. BMJ 2012;344:e356.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="5"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-5">5</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Smolina K, Wright FL, Rayner M, et al. </span>Determinants of the decline in mortality from acute myocardial infarction in England between 2002 and 2010: linked national database study. BMJ 2012; 344:d8059.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="6"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-6">6</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Nedkoff L, Briffa TG, Knuiman M, et al. </span>Temporal trends in the incidence and recurrence of hospitalised atherothrombotic disease in an Australian population, 2000-07: data linkage study. Heart 2012;98:1449-56.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="7"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-7">7</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Pearson-Stuttard J, Bajekal M, Scholes S, et al.</span> Recent UK Trends in the unequal burden of coronary heart disease. Heart 2012;98:1573-82.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="8"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-8">8</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Kharazmi E, Dossus L, Rohrmann S, et al.</span> Pregnancy loss and risk of cardiovascular disease: a prospective population-based cohort study (EPIC-Heidelberg). Heart 2011;97:49-54.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="9"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-9">9</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Safford MM, Brown TM, Muntner PM, et al.</span> Association of race and sex with risk of incident acute coronary heart disease events. JAMA 2012; 308:1768-74.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="10"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-10">10</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Williams ED, Stamatakis E, Chandola T, et al.</span> Physical activity behaviour and coronary heart disease mortality among South Asian people in the UK: an observational longitudinal study. Heart 2011;97:655-9.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="11"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-11">11</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Zaman MJ, Bhopal RS.</span> New answers to three questions on the epidemic of coronary mortality in south Asians: incidence or case fatality? Biology or environment? Will the next generation be affected? Heart 2013;99:154-8.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="12"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-12">12</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Fihn SD, Gardin JM, Abrams J, et al.; American College of Cardiology Foundation; American Heart Association Task Force on Practice Guidelines; American College of Physicians; American Association for Thoracic Surgery; Preventive Cardiovascular Nurses Association; Society for Cardiovascular Angiography and Interventions; Society of Thoracic Surgeons. </span>ACCF/AHA/ACP/AATS/PCNA/SCAI/STS Guideline for the diagnosis and management of patients with stable ischemic heart disease: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines, and the American College of Physicians, American Association for Thoracic Surgery, Preventive Cardiovascular Nurses Association, Society for Cardiovascular Angiography and Interventions, and Society of Thoracic Surgeons. J Am Coll Cardiol 2012;60:e44-164.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <!-- ref --><p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="13"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-13">13</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Cooper A, Timmis A, Skinner J.</span> Guideline Development Group. Assessment of recent onset chest pain or discomfort of suspected cardiac origin: summary of NICE guidance. 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Heart 2011;97:1239-44.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana; color: windowtext;"><o:p></o:p></span></p>         <p class="MsoNormal" style=""> <span style="font-size: 10pt; font-family: Verdana; "><a name="23"></a> </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#-23">23</a></span><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Hulot JS, Collet JP, Silvain J, et al.</span> Cardiovascular risk in clopidogrel-treated patients according to cytochrome P450 2C19*2 loss-of-function allele or proton pump inhibitor coadministration: a systematic meta-analysis. 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