<?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>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>S1409-41422002000100004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Actualización en farmacoterapia: la farmacología de las estatinas. Primera parte]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arguedas Quesada]]></surname>
<given-names><![CDATA[José Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Medicina Depto. de Farmacología y Toxicología Clínica]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2002</year>
</pub-date>
<volume>4</volume>
<numero>1</numero>
<fpage>13</fpage>
<lpage>21</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1409-41422002000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1409-41422002000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1409-41422002000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las estatinas son un grupo de fármacos que se utilizan en el tratamiento de las dislipidemias porque inhiben la HMG-CoA reductasa, enzima clave en la síntesis de colesterol. Además, se han postulado muchas otras acciones, directas o indirectas, que pueden modificar de manera beneficiosa el proceso que conduce a la aterosclerosis. Existen importantes diferencias farmacocinéticas y farmacodinámicas entre los distintos miembros de esta clase de drogas, que pueden constituirse en elementos fundamentales a la hora de escoger determinada estatina en la práctica clínica. Las diferencias más notables se encuentran en la magnitud de los cambios que producen sobre el perfil de los lípidos sanguíneos, en las vías metabólicas que utilizan para ser eliminadas del organismo, y en el potencial para sufrir interacciones medicamentosas. A pesar de que en general son bien toleradas, es necesario tener algunos cuidados básicos que permitan utilizar estas drogas de una manera eficaz y segura, porque algunos efectos adversos, aunque infrecuentes, pueden ser muy serios y eventualmente fatales.]]></p></abstract>
</article-meta>
</front><body><![CDATA[ <div class="MsoNormal"><b><font face="Arial,Helvetica">Revisi&oacute;n</font></b></div>     <div class="MsoNormal">     <center><b><font face="Arial,Helvetica">Actualizaci&oacute;n en Farmacoterapia</font></b></center> </div>     <div class="MsoNormal">     <center><b><font face="Arial,Helvetica">La Farmacolog&iacute;a de las Estatinas: Primera Parte.</font></b></center> </div>     <div class="MsoNormal">&nbsp;     <center><b><font face="Arial,Helvetica"><font size="-1">Dr. Jos&eacute; Agust&iacute;n Arguedas Quesada<a name="*1"></a><a href="#*a">*</a></font></font></b></center> </div>     <div class="MsoNormal">&nbsp;     <br> <b><font face="Arial,Helvetica"><font size="-1">Resumen</font></font></b>     <br> <b><font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></b></div>     ]]></body>
<body><![CDATA[<div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Las estatinas son un grupo de f&aacute;rmacos que se utilizan en el tratamiento de las dislipidemias porque inhiben la HMG-CoA reductasa, enzima clave en la s&iacute;ntesis de colesterol.&nbsp; Adem&aacute;s, se han postulado muchas otras acciones, directas o indirectas, que pueden modificar de manera beneficiosa el proceso que conduce a la aterosclerosis.</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Existen importantes diferencias farmacocin&eacute;ticas y farmacodin&aacute;micas entre los distintos miembros de esta clase de drogas, que pueden constituirse en elementos fundamentales a la hora de escoger determinada estatina en la pr&aacute;ctica cl&iacute;nica.&nbsp; Las diferencias m&aacute;s notables se encuentran en la magnitud de los cambios que producen sobre el perfil de los l&iacute;pidos sangu&iacute;neos, en las v&iacute;as metab&oacute;licas que utilizan para ser eliminadas del organismo, y en el potencial para sufrir interacciones medicamentosas.</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">A pesar de que en general son bien toleradas, es necesario tener algunos cuidados b&aacute;sicos que permitan utilizar estas drogas de una manera eficaz y segura, porque algunos efectos adversos, aunque infrecuentes, pueden ser muy serios y eventualmente fatales.</font></font></div> &nbsp;     <div class="MsoNormal" style="text-align: justify;"><b><font  face="Arial,Helvetica"><font size="-1">Introducci&oacute;n</font></font></b></div>     <div class="MsoNormal" style="text-align: justify;">&nbsp;     <br> <font face="Arial,Helvetica"><font size="-1">Las estatinas han revolucionado la terapia de las dislipidemias, debido a que tienen un mejor perfil de eficacia y tolerabilidad que los restantes tipos de f&aacute;rmacos anteriormente usados para tal fin.&nbsp; En la actualidad, se usan varios tipos de estatinas en la pr&aacute;ctica cl&iacute;nica:&nbsp; lovastatina, pravastatina y simvastatina son derivados del metabolismo f&uacute;ngico; fluvastatina y atorvastatina, considerados de segunda generaci&oacute;n, son sint&eacute;ticos y estructuralmente distintos, mientras que cerivastatina fue recientemente retirada del mercado por la compa&ntilde;&iacute;a productora. Es probable que otros compuestos, como rosuvastatina, est&eacute;n disponibles a corto plazo.</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Debido al extenso empleo de estas drogas en la pr&aacute;ctica cl&iacute;nica contempor&aacute;nea, y a los temores recientes en cuanto a su seguridad, es necesario conocer los aspectos fundamentales de la farmacolog&iacute;a de esta clase de medicamentos.&nbsp; El objetivo de este art&iacute;culo es que, a trav&eacute;s de una revisi&oacute;n de sus caracter&iacute;sticas b&aacute;sicas, se pueda aspirar a comprender mejor las evidencias cl&iacute;nicas actuales y a utilizar de manera racional y segura este importante recurso terap&eacute;utico.</font></font></div>     <div class="MsoNormal" style="text-align: justify;">&nbsp;     <br> <b><font face="Arial,Helvetica"><font size="-1">Mecanismo de acci&oacute;n</font></font></b>     <br> <b><font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></b></div>     ]]></body>
<body><![CDATA[<div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">La HMG-CoA reductasa es la enzima que regula la velocidad de s&iacute;ntesis de colesterol en el h&iacute;gado y en otros tejidos.&nbsp; Su estructura es un tetr&aacute;mero; los cuatro mon&oacute;meros que la componen son id&eacute;nticos, y todos contribuyen al sitio activo de la enzima.&nbsp; El colesterol, y otros productos intermediarios, llamados isoprenoides, ejercen un retrocontrol negativo sobre la expresi&oacute;n del gen que codifica la producci&oacute;n de reductasa <a href="#img1">(figura 1</a>) <a href="#1autor">(1)</a>.</font></font>     <br>     <br>     <center><a name="img1"></a><img src="/img/fbpe/rcc/v4n1/1059i1.GIF"  height="392" width="459"></center>     
<br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Las estatinas se unen de manera covalente al sitio activo de la reductasa, con mayor afinidad que la HMG-CoA y, por lo tanto, funcionan como inhibidores competitivos, por lo cual disminuyen la s&iacute;ntesis y el contenido intracelular de colesterol <a href="#2autor">(2,3)</a>.&nbsp; La estructura qu&iacute;mica de cada una de estas drogas determina la avidez para unirse al sitio activo, y puede tener relaci&oacute;n directa sobre la potencia de cada compuesto.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Recientemente, se ha descrito que las estatinas no solo compiten con el sustrato natural por el sitio activo de la enzima, sino que, adem&aacute;s, alteran la conformaci&oacute;n de esta &uacute;ltima y limitan su actividad funcional, lo que aumenta su eficacia y su especificidad <a href="#4autor">(4)</a>.</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">A consecuencia de la disminuci&oacute;n intracelular de colesterol, se activa una proteasa (SREBP) que libera prote&iacute;nas reguladoras del ret&iacute;culo endopl&aacute;smico; a nivel nuclear, esas prote&iacute;nas facilitan la expresi&oacute;n del gen que codifica al receptor B/E <a href="#5autor">(5)</a>.&nbsp; La mayor disponibilidad de receptores B/E en la membrana celular provoca un aumento en la captura, mediante endocitosis, de LDL y otros tipos de lipoprote&iacute;nas, principalmente en el h&iacute;gado, la gl&aacute;ndula suprarrenal y el tejido graso <a href="#img2">(figura 2)</a> <a  href="#6autor">(6)</a>.</font></font>     <br>     ]]></body>
<body><![CDATA[<br>     <center><a name="img2"></a><img src="/img/fbpe/rcc/v4n1/1059i2.GIF"  height="334" width="401"></center>     
<br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Como resultado final, se obtienen cambios en los niveles sangu&iacute;neos de l&iacute;pidos:&nbsp; disminuci&oacute;n significativa del colesterol LDL (17 a 54%), aumento discreto del colesterol HDL (5 a 10%) y, en el caso de algunas estatinas, descenso de los triglic&eacute;ridos.&nbsp; La magnitud de esos cambios en el perfil de l&iacute;pidos depender&aacute; del f&aacute;rmaco espec&iacute;fico y de la dosis utilizada (<a href="#tab1">cuadro1)</a><a  href="#7-autor">(7)</a>.&nbsp; El m&aacute;ximo efecto sobre los niveles sangu&iacute;neos de lipoprote&iacute;nas se consigue despu&eacute;s de 4 a 6 semanas de uso del medicamento, independientemente de las caracter&iacute;sticas cin&eacute;ticas de cada droga <a  href="#8-autor">(8</a><a href="#9-autor">,9)</a>.</font></font>    <br>     <br>     <center><a name="tab1"></a><img  src="/img/fbpe/rcc/v4n1/1059ta1.GIF" height="284" width="599"></center>     
<br> &nbsp; <font face="Arial,Helvetica"><font size="-1">    <br> </font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Se han detectado y analizado experimentalmente muchas otras acciones de las estatinas (<a href="#tab2">cuadro 2</a>) <a href="#10-autor">(10</a>-<a  href="#33autor">33)</a>; esas propiedades no lip&iacute;dicas pueden diferir entre las distintas drogas de la clase.&nbsp; Aunque es dif&iacute;cil establecerlo con certeza, pues algunos datos indican que la funci&oacute;n endotelial puede mejorar con solo un agresivo descenso del colestero&brvbar; LDL por medios no farmacol&oacute;gicos <a href="#34autor">(34)</a>, hay evidencias de que al menos algunos de esos otros mecanismos son independientes, y no solo la consecuencia de los efectos metab&oacute;licos de esta clase de drogas <a  href="#35autor">(35</a>,<a href="#36autor">36)</a>.&nbsp; Es muy importante se&ntilde;alar que varios de esos procesos est&aacute;n estrechamente relacionados entre s&iacute;, de manera que la mejor&iacute;a de alguno de ellos puede influir positivamente al resto.&nbsp; La conclusi&oacute;n es que todas esas otras propiedades de las estatinas combaten, directa o indirectamente, la disfunci&oacute;n endotelial, y modifican la estructura y la composici&oacute;n de las placas de ateroma, que se vuelven m&aacute;s estables a la erosi&oacute;n y a la ruptura <a href="#37autor">(37</a>-<a  href="#41autor">41)</a>.&nbsp; Algunos de esos cambios aparecen poco tiempo despu&eacute;s del inicio de la administraci&oacute;n de las drogas <a href="#42autor">(42)</a>, y transforman las caracter&iacute;sticas protromb&oacute;ticas y vasoesp&aacute;sticas que tiene el endotelio en los estados de hipercolesterolemia <a  href="#43-autor">(43</a>).</font></font>     ]]></body>
<body><![CDATA[<br>     <br>     <center><a name="tab2"></a><img  src="/img/fbpe/rcc/v4n1/1059ta2.GIF" height="355" width="535"></center>     
<br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">A nivel molecular, uno de los mecanismos que est&aacute; cobrando mayor vigencia en la actualidad para explicar estos hallazgos es que las estatinas aumentan la producci&oacute;n de &oacute;xido n&iacute;trico en el endotelio vascular, que suele estar inhibida por acci&oacute;n de radicales de ox&iacute;geno libres producidos a partir de las mol&eacute;culas oxidadas de LDL (<a  href="#44autor">44</a>).</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Aunque todav&iacute;a no se ha definido con certeza el impacto cl&iacute;nico que estas acciones din&aacute;micas puedan tener, se cree que son responsables de algunos de los beneficios obtenidos a corto plazo en el tratamiento de los pacientes con enfermedad coronaria (<a href="#36autor">36,</a> <a  href="#45autor">45-47</a>).</font></font></div> &nbsp;     <div class="MsoNormal" style="text-align: justify;"><b><font  face="Arial,Helvetica"><font size="-1">Farmacocin&eacute;tica</font></font></b></div>     <div class="MsoNormal" style="text-align: justify;">&nbsp;     <br> <font face="Arial,Helvetica"><font size="-1">Existen muchas diferencias cin&eacute;ticas entre las estatinas, con posibles implicaciones pr&aacute;cticas (<a href="#tab3">cuadro 3)</a>.&nbsp; Fluvastatina es la que se absorbe mejor; la escasa absorci&oacute;n de lovastatina aumenta de manera notable cuando se administra con los alimentos <a href="#9-autor">(9</a>, <a  href="#48autor">48)</a>.&nbsp; La biodisponibilidad oral de lovastatina y simvastatina es muy baja, lo cual no trae grandes repercusiones porque se administran como prodrogas y, por lo tanto, la actividad farmacol&oacute;gica depende de sus metabolitos (<a href="#48autor">48, 49)</a>.    ]]></body>
<body><![CDATA[<br>     <br> </font></font>     <center><a name="tab3"></a><img  src="/img/fbpe/rcc/v4n1/1059ta3.GIF" height="208" width="560"></center>     
<br> </div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Con la excepci&oacute;n de pravastatina, que se metaboliza por medio de reacciones de fase II, todas las otras sufren un extenso metabolismo hep&aacute;tico de primer paso por el sistema enzim&aacute;tico microsomal del citocromo P450 <a href="#50autor">(50)</a>.&nbsp; Algunas tienen metabolitos activos.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Atorvastatina es la m&aacute;s selectiva para actuar a nivel hep&aacute;tico y, adem&aacute;s, produce la inhibici&oacute;n m&aacute;s prolongada sobre la HMG-CoA reductasa <a href="#51autor">(51)</a>; se cree que esta propiedad es responsable de su mayor efecto sobre los niveles sangu&iacute;neos de colesterol LDL y de triglic&eacute;ridos <a href="#8-autor">(8</a>,<a href="#52autor"> 52)</a>.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">A diferencia de pravastatina, las restantes estatinas se ligan extensamente a la alb&uacute;mina y a otras prote&iacute;nas del plasma (<a  href="#50autor">50</a>,<a href="#53autor"> 53</a>).</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">La excreci&oacute;n urinaria es relevante solo en el caso de pravastina y, en menor grado, de simvastatina y lovastatina <a href="#49autor">(49,</a><a  href="#53autor">53)</a>, por lo que es preciso realizar ajustes de sus dosis en presencia de insuficiencia renal <a href="#tab4">(cuadro 4</a>).</font></font>     ]]></body>
<body><![CDATA[<br>     <br>     <center><a name="tab4"></a><img  src="/img/fbpe/rcc/v4n1/1059ta4.GIF" height="187" width="569"></center>     
<br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><b><font  face="Arial,Helvetica"><font size="-1">Interacciones medicamentosas</font></font></b></div>     <div class="MsoNormal" style="text-align: justify;">&nbsp;     <br> <font face="Arial,Helvetica"><font size="-1">Los compuestos liposolubles deben metabolizarse a sustancias m&aacute;s hidrof&iacute;licas para poder ser excretados, mientras que una porci&oacute;n mayor de las drogas hidrosolubles puede excretarse, sin cambios, por la orina; esta caracter&iacute;stica incide en que el &uacute;ltimo tipo de f&aacute;rmacos, como pravastatina, tenga un menor potencial de interacciones medicamentosas (<a  href="#54autor">54</a>).</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Debido a que est&aacute; involucrada en la mayor&iacute;a de las reacciones metab&oacute;licas relacionadas con los f&aacute;rmacos y las sustancias end&oacute;genas, la isoforma CYP3A4 es la enzima m&aacute;s importante del citocromo P450.&nbsp; Se ha observado que la utilizaci&oacute;n simult&aacute;nea, en un mismo paciente, de un f&aacute;rmaco inhibidor de la isoforma CYP3A4, disminuye el metabolismo y aumenta notablemente las concentraciones sangu&iacute;neas de lovastatina, simvastatina y atorvastatina, pero no las de pravastatina (<a href="#55autor">55, 56</a>) (<a href="#tab5">cuadro 5</a>); esta informaci&oacute;n, que es congruente con las distintas v&iacute;as metab&oacute;licas utilizadas por cada una de esas drogas, adquiere gran importancia pr&aacute;ctica porque muchos de los efectos adversos de los f&aacute;rmacos est&aacute;n directamente relacionados con su concentraci&oacute;n sangu&iacute;nea.&nbsp; La inhibici&oacute;n de la isoforma CYP2C9 tambi&eacute;n puede ocasionar muchas interacciones (<a href="#tab5">cuadro 5)</a>.</font></font>     ]]></body>
<body><![CDATA[<br>     <br>     <center><a name="tab5"></a><img  src="/img/fbpe/rcc/v4n1/1059ta5.GIF" height="371" width="527"></center>     
<br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Este aspecto adquiere una especial relevancia en los sujetos que gen&eacute;ticamente tienen una isoforma de CYP450 con actividad baja o nula, pues ellos son m&aacute;s sensibles a sufrir interacciones medicamentosas y efectos adversos serios por el ac&uacute;mulo de los f&aacute;rmacos que, en condiciones normales, deber&iacute;an haber utilizado esa v&iacute;a metab&oacute;lica para su eliminaci&oacute;n <a href="#57autor">(57)</a>.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">El ligado extenso a las prote&iacute;nas del plasma puede ser otro mecanismo productor de interacciones medicamentosas, pues, al desplazar a otros compuestos de su sitio de uni&oacute;n, se produce una mayor concentraci&oacute;n de droga libre activa; sin embargo, todav&iacute;a se desconoce el impacto cl&iacute;nico que este tipo de interacciones pueda tener en el caso de las estatinas.</font></font></div>     <div class="MsoNormal" style="text-align: justify;">&nbsp;     <br> <b><font face="Arial,Helvetica"><font size="-1">Efectos adversos</font></font></b>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font>     ]]></body>
<body><![CDATA[<br> <font face="Arial,Helvetica"><font size="-1">Los efectos adversos reportados con mayor frecuencia han sido estre&ntilde;imiento, n&aacute;usea, dolor abdominal, diarrea, flatulencia, insomnio y cefalea, que suelen ser leves y transitorios<a href="#58-autor">(58)</a>.</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Se ha descrito una elevaci&oacute;n de las transaminasas hep&aacute;ticas aproximadamente en el 1-2% de los pacientes tratados <a href="#7-autor">(7),</a> pero la hepatitis sintom&aacute;tica es rara.&nbsp; La alteraci&oacute;n en las transaminasas ha sido mencionada con todas las estatinas, en especial cuando se usan a dosis altas.&nbsp; Se recomienda realizar esa prueba de laboratorio antes de administrar el medicamento, y luego cada 4-6 semanas durante los primeros meses de terapia; no debe iniciarse, o debe suspenderse el f&aacute;rmaco, si se detectan niveles de transaminasas tres veces por encima del valor normal.&nbsp; La prueba usualmente retorna al valor normal en los tres meses siguientes a la suspensi&oacute;n de la droga (<a  href="#59autor">59)</a>.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">La toxicidad sobre el m&uacute;sculo estriado es un efecto adverso poco frecuente de las estatinas.&nbsp; Cuando se utilizan como monoterapia, este efecto adverso se ha presentado en cerca de un caso por cada mil pacientes tratados <a href="#7-autor">(7)</a>.&nbsp; Su intensidad puede variar desde mialgias no espec&iacute;ficas hasta miositis, que en raras ocasiones progresa a rabdomiolisis, potencialmente mortal por insuficiencia renal aguda.&nbsp; Se cree que una deficiencia enzim&aacute;tica est&aacute; involucrada en la predisposici&oacute;n de determinados individuos a sufrir ese serio inconveniente <a href="#60autor">(60)</a>.&nbsp; La muerte de m&aacute;s de 50 pacientes reportada a nivel mundial por ese s&iacute;ndrome, fue la causa de que la compa&ntilde;&iacute;a productora de cerivastatina retirara ese producto del mercado hace varios meses.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Aunque no se ha aclarado el mecanismo preciso, algunos datos sugieren que estos efectos sobre el m&uacute;sculo esquel&eacute;tico pueden ser causados por la depleci&oacute;n intracelular de metabolitos intermediarios esenciales derivados del mevalonato (<a href="#61autor">61)</a>.&nbsp; Se ha postulado, entonces, que las estatinas liposolubles, por tener una mayor penetraci&oacute;n en los miocitos, ser&iacute;an m&aacute;s propensas a desencadenar lesiones a ese nivel.&nbsp; Sin embargo, esa hip&oacute;tesis no se ha corroborado;&nbsp; la miotoxicidad ha ocurrido con todas las estatinas disponibles, y no existen a&uacute;n estudios comparativos directos de seguridad entre ellas (<a  href="#62autor">62)</a>.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Dado que la miotoxicidad es un efecto secundario dosis-dependiente, adquieren relevancia las interacciones medicamentosas que impliquen una disminuci&oacute;n del metabolismo de las estatinas por inhibici&oacute;n del sistema enzim&aacute;tico del citocromo P-450 <a href="#tab5"><b>(</b>cuadro 5)</a>.&nbsp; Por ejemplo, es bien conocido el hecho de que la combinaci&oacute;n con gemfibrozil, otro f&aacute;rmaco hipolipemiante, aumenta el riesgo de rabdomiolisis <a href="#63autor">(63)</a>; se piensa que el problema podr&iacute;a ser menos frecuente si se usara un fibrato con vida media m&aacute;s corta y una estatina cuyo metabolismo no dependa exclusivamente de CYP 3A4 <a  href="#64autor">(64)</a>.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     ]]></body>
<body><![CDATA[<div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Otros factores de riesgo para miopat&iacute;a inducida por estatinas son insuficiencia hep&aacute;tica o renal, hipotiroidismo, infecci&oacute;n aguda y edad avanzada <a href="#50autor">(50)</a>.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Debido a la potencial severidad del problema, es indispensable que todo paciente que empieza a recibir terapia con una estatina sea informado sobre la importancia de reportar la aparici&oacute;n de mialgias o de debilidad muscular; el diagn&oacute;stico de miositis, que se confirma con determinaciones s&eacute;ricas de creatinfosfoquinasa (CPK) diez veces por encima del valor normal, obliga a suspender el f&aacute;rmaco.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">En estudios de cohorte, se ha observado un mayor riesgo de accidente vascular cerebral hemorr&aacute;gico en hombres con colesterol LDL inferior a 160 mg/dL <a href="#64autor">(64, 65</a>);&nbsp; obviamente, esos datos epidemiol&oacute;gicos pueden estar influidos por otras condiciones concomitantes, pues no se han repetido en los ensayos cl&iacute;nicos con estatinas.</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">A pesar de algunos temores iniciales derivados de estudios en animales de laboratorio, no se ha demostrado que exista un riesgo aumentado de c&aacute;ncer en los pacientes tratados con estatinas (<a href="#66autor">66, 67</a>).</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">No deben usarse estos f&aacute;rmacos durante el embarazo, pues el colesterol es necesario para el adecuado desarrollo del producto de la gestaci&oacute;n, y el uso de estas drogas podr&iacute;a ocasionarle serios problemas.</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Aunque no se cuente con evidencias de seguridad a muy largo plazo, los datos existentes despu&eacute;s de siete a&ntilde;os de uso son alentadores <a  href="#68autor">(68)</a>.&nbsp; Sin embargo, es necesario mencionar un hallazgo muy interesante del estudio AFCAPS/TexCAPS (<a href="#69autor">69)</a>, en lo que se refiere a eventos adversos serios.&nbsp; Por definici&oacute;n, los eventos adversos serios incluyen cualquier suceso no deseado, que ocasione la muerte, amenace la vida, requiera hospitalizaci&oacute;n, prolongue la estancia hospitalaria, o resulte en una discapacidad persistente o significativa <a  href="#70autor">(70)</a>, y deben incluirse en todos los reportes de ensayos cl&iacute;nicos, aunque en ese momento no pueda establecerse con certeza si el hecho se relaciona o no con el procedimiento en estudio.&nbsp; AFCAPS/TexCAPS es un ensayo cl&iacute;nico controlado, que evalu&oacute; el uso de lovastatina en comparaci&oacute;n con placebo, en la prevenci&oacute;n primaria de la enfermedad coronaria en m&aacute;s de 6.000 pacientes con niveles de colesterol LDL dentro del rango normal <a href="#69autor">(69)</a>.&nbsp; A pesar de que se detect&oacute; una disminuci&oacute;n significativa en el riesgo de sufrir infarto de miocardio o mortalidad cardiovascular con el f&aacute;rmaco, la tasa de eventos adversos serios fue similar en ambos grupos; ese hallazgo plantea la interrogante de si existe un aumento en el riesgo absoluto de otros eventos serios con el uso del medicamento, pero no se brinda informaci&oacute;n al respecto.&nbsp; A la luz del problema reciente con cerivastatina, es vital que este aspecto sea aclarado, en especial cuando se refiere al uso de estatinas en pacientes con un riesgo cardiovascular global bajo, y tomando en cuenta que, recientemente, se document&oacute; que los datos de seguridad no son reportados de manera precisa en muchos ensayos cl&iacute;nicos <a  href="#71-autor">(71)</a>.</font></font></div>     ]]></body>
<body><![CDATA[<div class="MsoNormal" style="text-align: justify;">&nbsp;     <br> &nbsp;     <br> <b><font face="Arial,Helvetica"><font size="-1">Conclusi&oacute;n</font></font></b></div>     <div class="MsoNormal" style="text-align: justify;">&nbsp;     <br> <font face="Arial,Helvetica"><font size="-1">Indudablemente las estatinas han provocado un cambio rotundo en el manejo m&eacute;dico de las dislipidemias.&nbsp; A pesar de toda la informaci&oacute;n disponible, es indispensable contar con nuevas evidencias que permitan definir con exactitud el papel de estas drogas en la terap&eacute;utica.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Se debe aclarar los otros mecanismos de acci&oacute;n propuestos, independientes de su acci&oacute;n sobre el metabolismo del colesterol, ya que podr&iacute;an convertirse en nuevos sitios importantes para la manipulaci&oacute;n farmacol&oacute;gica, de manera que el proceso de aterosclerosis pueda atacarse a diferentes niveles.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">Es indispensable que se identifique el proceso responsable de los efectos adversos serios, que se evite el uso simult&aacute;neo de drogas que puedan interactuar con las estatinas, que se determine la relaci&oacute;n riesgo/beneficio para cada caso en particular, y que, a trav&eacute;s de un adecuado sistema de farmacovigilancia, se establezca un reporte eficiente de los efectos adversos.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     ]]></body>
<body><![CDATA[<div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">A pesar de sus similitudes, existen tambi&eacute;n diferencias entre las distintas drogas de esta clase: simvastatina y atorvastatina son las que producen cambios cuantitativamente mayores en los niveles de lipoprote&iacute;nas plasm&aacute;ticas, mientras que pravastatina es la menos problem&aacute;tica en cuanto a interacciones medicamentosas.</font></font>     <br> <font face="Arial,Helvetica"><font size="-1">&nbsp;</font></font></div>     <div class="MsoNormal" style="text-align: justify;"><font  face="Arial,Helvetica"><font size="-1">La importancia de estas discrepancias en la farmacolog&iacute;a b&aacute;sica de las distintas estatinas es que esos factores pueden traducirse en diferencias en la eficacia, en la seguridad y en el riesgo de efectos adversos; sin embargo, toda esa informaci&oacute;n debe analizarse bajo la luz de los hallazgos de los ensayos cl&iacute;nicos controlados, y debe enfatizar, adem&aacute;s, la necesidad de estudios comparativos a largo plazo entre las distintas drogas de esta clase.</font></font></div> &nbsp;     <div class="MsoNormal" style="text-align: justify;">     <p><b><font face="Arial,Helvetica"><font size="-1">Bibliograf&iacute;a</font></font></b></p> </div>     <div class="MsoNormal" style="text-align: justify;">&nbsp;     <!-- ref --><br> <a name="1autor"></a><font face="Arial,Helvetica"><font size="-1">1- Brown MS, Goldstein JL.&nbsp; Multivalent feedback of HMG CoA reductase, a control mechanism coordinating isoprenoid synthesis and cell growth.&nbsp; J Lip Res 1980;21:505-517.</font></font></div>    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=729028&pid=S1409-4142200200010000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><div class="MsoNormal" style="text-align: justify;">&nbsp;     <!-- ref --><br> <a name="2autor"></a><font face="Arial,Helvetica"><font size="-1">2- Knopp RH.&nbsp; Drug treatment of lipid disorders.&nbsp;&nbsp; N Eng J Med 1999;341:498-511.</font></font></div>    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=729030&pid=S1409-4142200200010000400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><div class="MsoNormal" style="text-align: justify;">&nbsp;     ]]></body>
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