<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402008000600002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Prevención y tratamiento de la hipertensión arterial sistémica en el paciente con enfermedad arterial coronaria]]></article-title>
<article-title xml:lang="en"><![CDATA[Prevention and treatment of hypertension and coronary heart disease]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-González]]></surname>
<given-names><![CDATA[Celso]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosas]]></surname>
<given-names><![CDATA[Martín]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lomelí Estrada]]></surname>
<given-names><![CDATA[Catalina]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lorenzo]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Reding]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Sánchez]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pastelín]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Férez-Santander]]></surname>
<given-names><![CDATA[Sergio Mario]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Attie]]></surname>
<given-names><![CDATA[Fause]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez  ]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<volume>78</volume>
<fpage>58</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402008000600002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402008000600002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402008000600002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La asociación entre hipertensión arterial sistémica (HAS) y enfermedad arterial coronaria está bien demostrada a través de diversos estudios epidemiológicos. La hipertensión arterial es un factor de riesgo independiente importante para el desarrollo de coronariopatía, enfermedad vascular cerebral y nefropatía. Existen avances importantes en el conocimiento de factores neurohumorales y hemodinámicos que confluyen en la fisiopatología de la hipertensión y en el desarrollo de enfermedad coronaria que permiten establecer mejores estrategias no sólo de tratamiento sino también de prevención, con la finalidad de disminuir la mortalidad cardiovascular. El espectro de la cardiopatía aterosclerosa es amplio y las estrategias de tratamiento de la hipertensión deben adecuarse a la forma de manifestación de la enfermedad coronaria que se presente. El tratamiento de ambas condiciones requiere de lineamientos específicos de acuerdo a las condiciones del paciente y la forma de presentación de cada una de estas patologías.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The association between arterial systemic hypertension arterial coronary disease has been demonstrated by cumulated evidence of several epidemiological studies. Hypertension is an important independent risk factor for the development of coronary artery disease, vascular cerebral disease and nephropathy. Important advances exist in the knowledge of neurohumoral and hemodynamic factors that come together in the pathophysiology of the hypertension and in the development of coronary disease that allow to establish better strategies not only of treatment, but also of prevention, with the purpose of diminishing the cardiovascular mortality. The spectrum of the coronary artery disease secondary to atherosclerosis is wide and the strategies of treatment of hypertension must be adapted to each particular case. The treatment of both conditions needs of specific limits of agreement to the conditions of the patient and the form of presentation of each one of these disease.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hipertensión arterial sistémica]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad coronaria]]></kwd>
<kwd lng="es"><![CDATA[Aterosclerosis]]></kwd>
<kwd lng="en"><![CDATA[Arterial systemic hypertension]]></kwd>
<kwd lng="en"><![CDATA[Coronary disease]]></kwd>
<kwd lng="en"><![CDATA[Atherosclerosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Prevenci&oacute;n y tratamiento de la hipertensi&oacute;n arterial sist&eacute;mica en el paciente con enfermedad arterial coronaria</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Prevention and treatment of hypertension and coronary heart disease</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Celso Mendoza&#150;Gonz&aacute;lez,* Mart&iacute;n Rosas,* Catalina Lomel&iacute; Estrada,* Jos&eacute; Antonio Lorenzo,* Arturo M&eacute;ndez,* Jes&uacute;s Mart&iacute;nez&#150;Reding,* Carlos Mart&iacute;nez&#150;S&aacute;nchez,*** Gustavo Pastel&iacute;n,* Sergio Mario F&eacute;rez&#150;Santander,**** Fause Attie*****</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Cardiolog&iacute;a Adultos. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i>** Departamento de Farmacolog&iacute;a. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i>*** Departamento de Urgencias y Unidad Coronaria. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i>**** Subdirector Ense&ntilde;anza. </i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>***** Director General.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>    <br>   <i>Celso Mendoza&#150;Gonz&aacute;lez.     <br> Cardiolog&iacute;a Adultos III.     <br> Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez.     <br> (INCICH, Juan Badiano N&uacute;m. 1. Col. Secci&oacute;n XVI,     <br> Tlalpan, 14080 M&eacute;xico, D.F.),    <br> Correo electr&oacute;nico:</i> <a href="mailto:celame@yahoo.com.mx">celame@yahoo.com.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido: 20 de diciembre de 2007.    <br> Aceptado: 24 de febrero de 2008.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">La asociaci&oacute;n entre hipertensi&oacute;n arterial sist&eacute;mica (HAS) y enfermedad arterial coronaria est&aacute; bien demostrada a trav&eacute;s de diversos estudios epidemiol&oacute;gicos. La hipertensi&oacute;n arterial es un factor de riesgo independiente importante para el desarrollo de coronariopat&iacute;a, enfermedad vascular cerebral y nefropat&iacute;a. Existen avances importantes en el conocimiento de factores neurohumorales y hemodin&aacute;micos que confluyen en la fisiopatolog&iacute;a de la hipertensi&oacute;n y en el desarrollo de enfermedad coronaria que permiten establecer mejores estrategias no s&oacute;lo de tratamiento sino tambi&eacute;n de prevenci&oacute;n, con la finalidad de disminuir la mortalidad cardiovascular. El espectro de la cardiopat&iacute;a aterosclerosa es amplio y las estrategias de tratamiento de la hipertensi&oacute;n deben adecuarse a la forma de manifestaci&oacute;n de la enfermedad coronaria que se presente. El tratamiento de ambas condiciones requiere de lineamientos espec&iacute;ficos de acuerdo a las condiciones del paciente y la forma de presentaci&oacute;n de cada una de estas patolog&iacute;as.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Hipertensi&oacute;n arterial sist&eacute;mica. Enfermedad coronaria. Aterosclerosis.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">The association between arterial systemic hypertension arterial coronary disease has been demonstrated by cumulated evidence of several epidemiological studies. Hypertension is an important independent risk factor for the development of coronary artery disease, vascular cerebral disease and nephropathy. Important advances exist in the knowledge of neurohumoral and hemodynamic factors that come together in the pathophysiology of the hypertension and in the development of coronary disease that allow to establish better strategies not only of treatment, but also of prevention, with the purpose of diminishing the cardiovascular mortality. The spectrum of the coronary artery disease secondary to atherosclerosis is wide and the strategies of treatment of hypertension must be adapted to each particular case. The treatment of both conditions needs of specific limits of agreement to the conditions of the patient and the form of presentation of each one of these disease.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Arterial systemic hypertension. Coronary disease. Atherosclerosis.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">La asociaci&oacute;n entre hipertensi&oacute;n arterial sist&eacute;mica (HAS) y enfermedad arterial coronaria est&aacute; bien demostrada a trav&eacute;s de diversos estudios epidemiol&oacute;gicos. La hipertensi&oacute;n arterial es un factor de riesgo independiente importante para el desarrollo de enfermedad coronaria, enfermedad vascular cerebral y nefropat&iacute;a.</font></p>     <p align="justify"><font face="verdana" size="2">La selecci&oacute;n del tratamiento antihipertensivo debe tener en cuenta no s&oacute;lo los valores &oacute;ptimos de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica, sino que adem&aacute;s debe considerar el riesgo de desarrollar enfermedad coronaria, los beneficios de los diferentes f&aacute;rmacos antihipertensivos en la prevenci&oacute;n del da&ntilde;o a &oacute;rganos blanco, la eficacia de estos mismos en la prevenci&oacute;n primaria y secundaria y cu&aacute;les son los de elecci&oacute;n en pacientes con cardiopat&iacute;a isqu&eacute;mica ya establecida. Por tanto es necesario definir los alcances de cada f&aacute;rmaco en relaci&oacute;n con la prevenci&oacute;n primaria y secundaria.<sup>1</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Epidemiolog&iacute;a de la hipertensi&oacute;n y enfermedad arterial coronaria</b></font></p>     <p align="justify"><font face="verdana" size="2">Las recomendaciones en la &uacute;ltima edici&oacute;n del Comit&eacute; Nacional sobre Prevenci&oacute;n, Detecci&oacute;n, Evaluaci&oacute;n y Tratamiento de la hipertensi&oacute;n arterial<sup>2</sup> han definido a la HAS como una presi&oacute;n sangu&iacute;nea de 140/90 mm Hg. Se incluye en la actualidad el concepto de la "pre&#150;hipertensi&oacute;n", definida como un valor de presi&oacute;n arterial sist&oacute;lica de 120 a 139 mm Hg o una presi&oacute;n arterial diast&oacute;lica de 80 a 89 mm Hg. Este &uacute;ltimo grupo ha cobrado gran inter&eacute;s debido a la necesidad de atenci&oacute;n m&eacute;dica, especialmente si la diabetes mellitus coexiste en ellos. De acuerdo a estos conceptos el n&uacute;mero de personas hipertensas a nivel mundial debe considerarse mucho m&aacute;s alto.</font></p>     <p align="justify"><font face="verdana" size="2">El comportamiento de la HAS tiene una estrecha relaci&oacute;n con la edad. Antes de los 50 a&ntilde;os de edad, el incremento en las cifras de tensi&oacute;n sist&oacute;lica y diast&oacute;lica es semejante, pero despu&eacute;s de esta edad, la presi&oacute;n sist&oacute;lica contin&uacute;a en ascenso mientras que el valor de la presi&oacute;n diast&oacute;lica tiende a disminuir. La prevalencia de la hipertensi&oacute;n sist&oacute;lica es por tanto directamente proporcional a la edad; en contraste, la prevalencia de la hipertensi&oacute;n diast&oacute;lica disminuye. El estudio Framingham estima el riesgo a 20 a&ntilde;os de desarrollar HAS en un 90% para hombres y mujeres con una edad media de 55 a 65 a&ntilde;os.<sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2">Tambi&eacute;n existe un mayor riesgo para eventos cardiovasculares asociados con aumento de la presi&oacute;n de pulso. En relaci&oacute;n con la edad, se ha establecido que en personas menores de 50 a&ntilde;os el valor de la presi&oacute;n diast&oacute;lica es el principal predictor de riesgo para cardiopat&iacute;a isqu&eacute;mica, mientras que en personas mayores de 60 a&ntilde;os, este riesgo lo establece el valor de presi&oacute;n sist&oacute;lica.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">Debido a que la prevalencia de hipertensi&oacute;n aumenta con la edad, el control adecuado de la presi&oacute;n sist&oacute;lica y de la presi&oacute;n de pulso, m&aacute;s que el control de la presi&oacute;n diast&oacute;lica en los ancianos, se ha vuelto imperativo como una medida de salud p&uacute;blica. Sin embargo, hay poca informaci&oacute;n en relaci&oacute;n a la eficacia de los antihipertensivos para el control de la presi&oacute;n de pulso.</font></p>     <p align="justify"><font face="verdana" size="2">En todos los grupos de edad, la relaci&oacute;n entre presi&oacute;n sist&oacute;lica o diast&oacute;lica y mortalidad por cardiopat&iacute;a isqu&eacute;mica es consistente. Ha quedado demostrado que la presi&oacute;n arterial se relaciona a enfermedad coronaria fatal y que con cada aumento en presi&oacute;n sist&oacute;lica de 20 mm Hg (o 10 mm Hg en presi&oacute;n diast&oacute;lica) se duplica el riesgo de un evento coronario fatal. El riesgo absoluto de estos resultados adversos tambi&eacute;n aumenta con la edad.<sup>5</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Un estudio demostr&oacute; que en hombres de 18 a 39 a&ntilde;os de edad con una presi&oacute;n basal de 130 a 139/ 85 a 89 mm Hg o con HTAS en estadio 1 (140 a 159/90 a 99 mm Hg) representaron casi 60% de la enfermedad coronaria, enfermedad cardiovascular o mortalidad de todas las causas.<sup>6 </sup>Con base en estos datos epidemiol&oacute;gicos, puede argumentarse que mucha gente con presi&oacute;n arterial previamente considerada normal podr&iacute;a beneficiarse de la reducci&oacute;n de la presi&oacute;n arterial si ellos tienen un riesgo significativo para tener eventos coronarios por otras razones.<sup>7 </sup>En el estudio Framingham se encontr&oacute; la evidencia de la relaci&oacute;n entre HTAS, dislipidemia, intolerancia a la glucosa, tabaquismo e hipertrofia ventricular izquierda.<sup>8</sup> Estos 5 factores de riesgo son los determinantes m&aacute;s importantes modificables de riesgo cardiovascular y se comportan de forma independiente de otros, aunque parece que la combinaci&oacute;n de ellos hace que el riesgo se multiplique m&aacute;s que sea una simple adhesi&oacute;n. Esto ha llevado a la idea que el umbral al que cada paciente podr&iacute;a ser tratado por HTAS, as&iacute; como el objetivo que deba alcanzarse, es mas bajo en aqu&eacute;llos con mayor riesgo. De acuerdo a este concepto, se propone que algunas caracter&iacute;sticas como la albuminuria, insuficiencia renal cr&oacute;nica y diabetes mellitus requieran un control m&aacute;s estricto y valores de presi&oacute;n arterial m&aacute;s bajos (130/80 mm Hg).<sup>9,10 </sup>Tambi&eacute;n hay correlaci&oacute;n entre HTAS y la masa corporal, y ambos se relacionan con la enfermedad coronaria. La HTAS y la obesidad abdominal son componentes del s&iacute;ndrome metab&oacute;lico.<sup>11</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Hipertensi&oacute;n sist&oacute;lica aislada</b></font></p>     <p align="justify"><font face="verdana" size="2">En personas con HTAS a cualquier edad, el aumento en la tensi&oacute;n de la pared vascular lleva a engrosamiento, fragmentaci&oacute;n y fractura de fibras de elastina, as&iacute; como aumento en el dep&oacute;sito de col&aacute;gena en arterias, lo que disminuye la elasticidad de estos vasos. Adem&aacute;s de estas anormalidades estructurales, la disfunci&oacute;n endotelial, lo que desarrolla como consecuencia, aumento de la rigidez arterial en ancianos con una presi&oacute;n de pulso amplia e hipertensi&oacute;n sist&oacute;lica aislada.<sup>12</sup></font></p>     <p align="justify"><font face="verdana" size="2">El aumento del grosor arterial, con aumento relacionado en la velocidad y reflexi&oacute;n de la onda de pulso, lleva al aumento de la presi&oacute;n sist&oacute;lica y postcarga, adem&aacute;s de descenso de la presi&oacute;n diast&oacute;lica, lo que compromete de forma potencial de la presi&oacute;n de perfusi&oacute;n coronaria. El aumento de la presi&oacute;n a&oacute;rtica central aumenta el trabajo card&iacute;aco favoreciendo la enfermedad coronaria y la hipertrofia ventricular.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Estr&eacute;s oxidativo</b></font></p>     <p align="justify"><font face="verdana" size="2">El estr&eacute;s oxidativo es una caracter&iacute;stica cr&iacute;tica en HTAS y aterog&eacute;nesis.<sup>13,14</sup> La generaci&oacute;n excesiva de especies reactivas al ox&iacute;geno pueden da&ntilde;ar a las c&eacute;lulas endoteliales o musculares y llevar a cambios agudos y cr&oacute;nicos en estructura y funci&oacute;n. En estas condiciones se liberan citocinas quimiot&aacute;cticas y adhesi&oacute;n de mol&eacute;culas sobre la superficie luminal del endotelio da&ntilde;ado, promoviendo la adhesi&oacute;n de leucocitos circulantes a la pared de estos vasos. Este proceso vascular inflamatorio de bajo grado subyacente al proceso ateroscler&oacute;tico contribuye a un reclutamiento continuo de leucocitos de la circulaci&oacute;n hacia dentrodelespacio sub&#150;endotelial. Los mediadores inflamatorios activan las c&eacute;lulas del m&uacute;sculo liso, causando proliferaci&oacute;n y migraci&oacute;n en la sub&iacute;ntima. En presencia de dislipidemia, los monocitos dentro de la pared del vaso incorporan lipoprote&iacute;nas de baja densidad oxidadas y se vuelven macr&oacute;fagos. Estos &uacute;ltimos conforman el centro de la placa ateroscler&oacute;tica. En lesiones establecidas, los macr&oacute;fagos secretan metaloproteinasas y catepsinas que inestabilizan la capa fibrosa de la placa, y que resultan en ruptura de la misma y liberaci&oacute;n tisular de factores que ocasionan trombosis, oclusi&oacute;n coronaria e infarto del miocardio. Este proceso contribuye a cambios estructurales de la microcirculaci&oacute;n vistos en HTAS. En el tejido vascular, los principales efectores de lesi&oacute;n oxidativa son activados por fuerzas mec&aacute;nicas, (HTAS), hormonas (particularmente angiotensina ii), colesterol oxidado y citocinas.<sup>15</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Factores humorales y metab&oacute;licos</b></font></p>     <p align="justify"><font face="verdana" size="2">Muchos de los mecanismos de la HTAS tambi&eacute;n promueven el da&ntilde;o a &oacute;rganos blanco, incluyendo a los vasos coronarios y el miocardio. Estos mecanismos incluyen aumento del tono simp&aacute;tico y de la actividad del sistema renina&#150;angiotensina&#150;aldosterona (SRAA), deficiencia en liberaci&oacute;n y/o actividad de vasodilatores, por ejemplo, &oacute;xido n&iacute;trico, prostaciclina y p&eacute;ptidos natriur&eacute;ticos, anormalidades estructurales y funcionales en arterias de conductancia y resistencia. Particularmente la disfunci&oacute;n endotelial aumenta la expresi&oacute;n de factores de crecimiento y citocinas inflamatorias en el &aacute;rbol arterial. Los antihipertensivos pueden ejercer al menos alguno de sus efectos ben&eacute;ficos sobre la vasculatura por acciones que son independientes de la disminuci&oacute;n de la presi&oacute;n arterial. La angiotensina ii eleva la presi&oacute;n arterial y promueve el da&ntilde;o a &oacute;rgano blanco, incluyendo aterosclerosis por una gran variedad de mecanismos. Hay efectos directos de angiotensina ii sobre la constricci&oacute;n y remodelado de vasos de resistencia, s&iacute;ntesis y liberaci&oacute;n de aldosterona, aumento del tono simp&aacute;tico y liberaci&oacute;n de catecolaminas de las gl&aacute;ndulas adrenales y terminales nerviosas perif&eacute;ricas simp&aacute;ticas. La aldosterona puede potencializar las propiedades vasoconstrictoras de la angiotensina ii y norepinefrina.<sup>16 </sup></font></p>     <p align="justify"><font face="verdana" size="2">La angiotensina ii promueve la hipertrofia ventricular y de las c&eacute;lulas del m&uacute;sculo liso vascular a trav&eacute;s de la activaci&oacute;n de receptores para angiotensina ii tipo 1 (AT1) e indirectamente al estimular la expresi&oacute;n de un n&uacute;mero de factores de crecimiento y citocinas, por ejemplo, factor de crecimiento derivado de plaquetas, factor de crecimiento de fibroblastos, factor de crecimiento "insulina&#150;like", as&iacute; como prote&iacute;nas quimiot&aacute;cticas de monocitos y mol&eacute;culas de adhesi&oacute;n vascular celular. Finalmente, hay una relaci&oacute;n entre la activaci&oacute;n del SRAA y fibrin&oacute;lisis.<sup>17,18 </sup>Los inhibidores de la enzima convertidora de angiotensina (IECA) y los bloqueadores de receptores de angiotensina han mostrado limitar las reacciones oxidativas en la vasculatura, lo que apoya el concepto de que el bloqueo del SRAA puede tener un importante efecto vaso&#150;protector m&aacute;s all&aacute; de disminuir s&oacute;lo la presi&oacute;n arterial.<sup>19</sup></font></p>     <p align="justify"><font face="verdana" size="2">Hay evidencia de la interacci&oacute;n entre SRAA y dislipidemia; la hipercolesterolemia genera una regulaci&oacute;n hacia arriba de este sistema, particularmente la densidad de receptores vasculares AT1 y la s&iacute;ntesis de angiotensina II sist&eacute;mica.<sup>20,21 </sup>Por otro lado, el SRAA estimula la acumulaci&oacute;n de lipoprote&iacute;nas de baja densidad en la pared arterial.<sup>22</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Presi&oacute;n arterial y objetivos del tratamiento</b></font></p>     <p align="justify"><font face="verdana" size="2">El objetivo global de la terapia es reducir la morbilidad y mortalidad. La existencia de dislipidemia y diabetes mellitus, modifican las cifras meta del tratamiento. En la actualidad el objetivo del tratamiento es conseguir cifras menores a 140/90 mm Hg, y menores de 130/80 mm Hg en individuos con diabetes mellitus o insuficiencia renal cr&oacute;nica. Recientemente, el tratamiento de la prehipertensi&oacute;n (presi&oacute;n arterial de 120 a 139/80 a 89 mm Hg) reduce la incidencia de la HTAS subsecuente.<sup>23</sup> En el sub<i>&#150;</i>an&aacute;lisis con ultrasonido intravascular del estudio CAMELOT <i>(Comparison of Amlodipine versus Enalapril to Limit Occurrences of Thrombosis),<sup>24</sup> </i>mostraron que las personas con presi&oacute;n arterial normal (120/80 mm Hg) tuvieron un descenso medio del volumen de ateroma de 4.6 mm<sup>3</sup>; mientras que los pacientes con prehipertensi&oacute;n (120 a 139/80 a 89 mm Hg) no tuvieron un cambio significativo; las personas hipertensas (140/90 mm Hg) tuvieron un incremento medio en el volumen de ateroma de 12.0 mm<sup>3</sup>. Existe por tanto la necesidad de conseguir los niveles m&aacute;s bajos de presi&oacute;n arterial, especialmente en quienes tienen da&ntilde;o a &oacute;rgano blanco. Hay controversia sobre el objetivo de tratamiento de la presi&oacute;n arterial en individuos con enfermedad coronaria, ya que se considera que los niveles excesivamente bajos de presi&oacute;n arterial diast&oacute;lica pueden alterar la perfusi&oacute;n coronaria. No hay estudios cl&iacute;nicos espec&iacute;ficamente dise&ntilde;ados para definir la presi&oacute;n arterial m&aacute;s adecuada en individuos con enfermedad coronaria.</font></p>     <p align="justify"><font face="verdana" size="2">Las recomendaciones se basan en el an&aacute;lisis de estudios epidemiol&oacute;gicos que han mostrado la estrecha relaci&oacute;n lineal entre presi&oacute;n arterial y riesgo de enfermedad cardiovascular. Aunque la correlaci&oacute;n epidemiol&oacute;gica no puede ser usada como indicador del valor de un tratamiento, hay informaci&oacute;n &uacute;til sobre algunas estrategias de tratamiento. Parece razonable proponer que el objetivo de valores de presi&oacute;n arterial para personas con riesgo de desarrollar enfermedad coronaria deber&aacute; ser m&aacute;s bajo que en los individuos con riesgo m&aacute;s bajo. Se recomiendan cifras de presi&oacute;n arterial menores a 130/80 mm Hg para personas con enfermedad coronaria demostrada o alguna otra manifestaci&oacute;n de enfermedad aterosclerosa (car&oacute;tidas, enfermedad arterial perif&eacute;rica, aneurisma abdominal), y para pacientes con alto riesgo, como diabetes mellitus, nefropat&iacute;a cr&oacute;nica o una puntuaci&oacute;n a 10 a&ntilde;os del 10% del estudio de Framingham. Esta escala es un algoritmo simple que usa variables categ&oacute;ricas que ha encontrado validez recientemente en el <i>"Framingham Heart Study" </i><i>P</i></font></p>     <p align="justify"><font face="verdana" size="2"><b>Autorregulaci&oacute;n coronaria</b></font></p>     <p align="justify"><font face="verdana" size="2">La perfusi&oacute;n mioc&aacute;rdica ocurre durante la di&aacute;stole y por tanto la presi&oacute;n diast&oacute;lica es igual a la presi&oacute;n de perfusi&oacute;n coronaria. La circulaci&oacute;n coronaria tiene un proceso de autorregulaci&oacute;n para mantener la perfusi&oacute;n constante con vaso&#150;dilataci&oacute;n en casos de disminuci&oacute;n de la presi&oacute;n arterial. Sin embargo, esta capacidad de dilataci&oacute;n en respuesta a descensos de la presi&oacute;n de perfusi&oacute;n es limitada.<sup>26 </sup></font></p>     <p align="justify"><font face="verdana" size="2">En presencia de enfermedad coronaria significativa existe una capacidad autorreguladora alterada.<sup>27</sup> Las consecuencias de la hipoperfusi&oacute;n coronaria son impredecibles y pueden depender del estr&eacute;s de la pared mioc&aacute;rdica. Los efectos de los medicamentos antihipertensivos sobre estas variables y la severidad de la enfermedad coronaria son diferentes. Aunque la presi&oacute;n sist&oacute;lica m&aacute;s baja se asocia al mejor pron&oacute;stico, la evidencia no ha sido consistente en relaci&oacute;n a que el descenso excesivo de la presi&oacute;n diast&oacute;lica pudiera comprometer el gasto card&iacute;aco. La gran mayor&iacute;ade individuos hipertensos, incluyendo aqu&eacute;llos con una presi&oacute;n de pulso amplia o con cardiopat&iacute;a estructural, no tendr&aacute;n problemas relacionados al descenso de la presi&oacute;n diast&oacute;lica con la terapia antihipertensiva usada com&uacute;nmente. Aunque la perfusi&oacute;n coronaria est&aacute; limitada por un umbral autorregulador este hecho no ha sido validado en humanos con arterias coronarias sanas o enfermas, y no existe consenso en relaci&oacute;n al nivel m&iacute;nimo seguro de presi&oacute;n arterial diast&oacute;lica.<sup>28</sup> Es prudente que en pacientes con presi&oacute;n arterial diast&oacute;lica elevada y enfermedad coronaria con evidencia de isquemia mioc&aacute;rdica, la presi&oacute;n arterial deba ser disminuida lentamente; deber&aacute;n evitarse descensos de la presi&oacute;n arterial diast&oacute;lica por debajo de 60 mm Hg, especialmente si existe diabetes mellitus o es mayor de 60 a&ntilde;os. En ancianos con HTAS con presi&oacute;n de pulso amplia, el descenso de la presi&oacute;n sist&oacute;lica puede ocasionar valores muy bajos de presi&oacute;n diast&oacute;lica (menos de 60 mm Hg). Este hecho obliga a evaluar cuidadosamente cualquier signo o s&iacute;ntoma, especialmente los que pudieran ser debidos a isquemia mioc&aacute;rdica.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Terapia farmacol&oacute;gica</b></font></p>     <p align="justify"><font face="verdana" size="2">Algunos de los f&aacute;rmacos antihipertensivos pueden tener beneficios sobre la aterosclerosis a trav&eacute;s de mecanismos independientes al control de la presi&oacute;n arterial: algunos pueden tener mayor efecto antiateroscleroso que otros, aunque esto no ha sido demostrado convincentemente. Se ha demostrado que el descenso de la presi&oacute;n arterial es m&aacute;s importante que la selecci&oacute;n del f&aacute;rmaco en la prevenci&oacute;n primaria de las complicaciones de la HTAS.<sup>29,30 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Frecuentemente es necesario utilizar alguna combinaci&oacute;n de medicamentos para conseguir un efecto sostenido para el control de la presi&oacute;n arterial. La indicaci&oacute;n del tratamiento inicia entonces por elegir un f&aacute;rmaco que controle las cifras de presi&oacute;n arterial y que ofrezca una protecci&oacute;n secundaria en individuos con enfermedades asociadas como la enfermedad coronaria, la insuficiencia renal cr&oacute;nica o la enfermedad vascular cerebral.</font></p>     <p align="justify"><font face="verdana" size="2">Los pacientes que ya han sufrido un infarto del miocardio o tengan disfunci&oacute;n ventricular izquierda han mejorado su pron&oacute;stico con el uso de IECA, f&aacute;rmacos que han mostrado adem&aacute;s prevenir o retardar la aterog&eacute;nesis.<sup>31 </sup>Sin embargo, los estudios VALUE <i>(Valsartan Antihypertensive Long term Use Evaluation) </i>y ALLHAT <i>(Antihypertensive and Li&#150;pid&#150;LoweringTreatment to Prevent Heart Attack) </i>no mostraron alg&uacute;n beneficio en particular de Valsartan y lisinopril respectivamente, al compararlos con medicamentos de otras clases.<sup>32,33</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Diur&eacute;ticos tiaz&iacute;dicos</b></font></p>     <p align="justify"><font face="verdana" size="2">Las tiazidas han mostrado su efectividad en el control de la HTAS y prevenci&oacute;n de los eventos cerebrovasculares.<sup>34&#150;36</sup> Se analiza si la hiperglucemia y diabetes mellitus inducidas por estos f&aacute;rmacos contribuyen al riesgo a largo plazo de enfermedad coronaria.<sup>37</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Beta&#150;bloqueadores</b></font></p>     <p align="justify"><font face="verdana" size="2">Estos medicamentos comprenden una clase relativamente heterog&eacute;nea con diferentes efectos sobre los vasos de resistencia y sobre la conducci&oacute;n y contractilidad card&iacute;aca. Son parte del tratamiento de los pacientes con angina de pecho, infarto del miocardio y con disfunci&oacute;n ventricular izquierda, con o sin s&iacute;ntomas de insuficiencia card&iacute;aca, a menos que est&eacute;n contraindicados. De este grupo, el carvedilol, metoprolol y bisoprolol han mostrado mejorar el pron&oacute;stico en pacientes con insuficiencia card&iacute;aca. En los pacientes sin estas caracter&iacute;sticas la evidencia de la cardioprotecci&oacute;n con beta&#150;bloqueadores es d&eacute;bil, especialmente en ancianos.<sup>38&#150;40 </sup>Algunos estudios mostraron un beneficio similar con el uso de verapamil<sup>41</sup> y en algunos otros se ha encontrado un beneficio mayor de amlodipino comparado con atenolol para reducir los eventos cardiovasculares.<sup>42</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Inhibidores de la enzima convertidora de angiotensina (IECA)</b></font></p>     <p align="justify"><font face="verdana" size="2">Los IECA son recomendados para todos los pacientes despu&eacute;s de ocurrido un infarto del miocardio. Se encuentran aprobados para el tratamiento de la insuficiencia card&iacute;aca, falla renal y combinados con tiazidas para la reducci&oacute;n de eventos cerebrovasculares.<sup>43&#150;46 </sup></font></p>     <p align="justify"><font face="verdana" size="2">El estudio HOPE tuvo como punto final combinado a la muerte de origen cardiovascular, infarto del miocardio y evento vascular cerebral; incluy&oacute; pacientes con enfermedad coronaria o alto riesgo de sufrirla, sin falla card&iacute;aca; el 47% de ellos eran hipertensos. En este estudio se compar&oacute; ramipril contra placebo; el grupo tratado mostr&oacute; una reducci&oacute;n del 22% en el punto final propuesto. Esta reducci&oacute;n fue similar para pacientes con y sin hipertensi&oacute;n basal. La reducci&oacute;n de las cifras tensionales fue peque&ntilde;a por lo que se pens&oacute; que era un beneficio independiente del valor de la presi&oacute;n arterial; sin embargo, un subestudio de este mismo an&aacute;lisis revel&oacute; una marcada reducci&oacute;n en el monitoreo ambulatorio de la presi&oacute;n arterial con el uso de IECA.<sup>47</sup></font></p>     <p align="justify"><font face="verdana" size="2">El estudio EUROPA propuso como punto final a la muerte de origen cardiovascular y compar&oacute; perindopril contra placebo. S&oacute;lo 27% de los pacientes incluidos fueron hipertensos. El tratamiento con perindopril se asoci&oacute; a una reducci&oacute;n del riesgo relativo del 20% en el punto final primario.<sup>48</sup> Los estudios HOPE y EUROPA por tanto mostraron la cardioprotecci&oacute;n ofrecida por los IECA.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Bloqueadores de receptores de angiotensina</b></font></p>     <p align="justify"><font face="verdana" size="2">Varios de estos f&aacute;rmacos han mostrado reducir la incidencia o severidad de la cardiopat&iacute;a isqu&eacute;mica, falla renal y eventos cerebrovasculares. Son apropiados en individuos con enfermedad cardiovascular que no toleran el uso de IECA. La protecci&oacute;n primaria contra los eventos cardiovasculares es similar a los que ofrecen los calcioantagonistas. En el estudio VALIANT, el beneficio de estos medicamentos fue similar al obtenido con inhibici&oacute;n de la enzima convertidora de angiotensina en la reducci&oacute;n de eventos cardiovasculares.<sup>49</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Antagonistas de aldosterona</b></font></p>     <p align="justify"><font face="verdana" size="2">La espironolactona y eplerenona, que com&uacute;nmente se adicionan al tratamiento para la falla card&iacute;aca, disminuyen la presi&oacute;n arterial y ofrecen un efecto protector secundario en pacientes con falla card&iacute;aca severa.<sup>50,51 </sup></font></p>     <p align="justify"><font face="verdana" size="2">No hay estudios grandes sobre los efectos cardiovasculares en personas tratadas con antagonistas de aldosterona para el tratamiento de la HTAS sin disfunci&oacute;n ventricular izquierda.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Bloqueadores de los canales de calcio</b></font></p>     <p align="justify"><font face="verdana" size="2">Este grupo lo conforman una clase heterog&eacute;nea de agentes con efectos similares sobre la presi&oacute;n arterial pero acciones diferentes sobre la conducci&oacute;n y contractilidad card&iacute;aca. La prevenci&oacute;n primaria de eventos cardiovasculares con amlodipina fue equivalente al producido por un diur&eacute;tico tiaz&iacute;dico o IECA en el estudio ALL HAT y superior con respecto al beta&#150;bloqueador en el estudio ASCOT. La protecci&oacute;n primaria con verapamilfuesimilar aldiur&eacute;ticoo el beta&#150;bloqueador en el estudio CONVINCE y el estudio INVEST.<sup>52</sup></font></p>     <p align="justify"><font face="verdana" size="2">Otros estudios mostraron un efecto similar sobre los eventos cardiovasculares de diltiazem y una combinaci&oacute;n de diur&eacute;tico y beta&#150;bloqueador.<sup>53 </sup>Los calcioantagonistas son alterantivas de los beta&#150;bloqueadores en el tratamiento de la angina pero generalmente no son recomendados para la protecci&oacute;n card&iacute;aca secundaria debido a su incapacidad para prevenir la dilataci&oacute;n ventricular y la falla card&iacute;aca, especialmente si se les compara con IECA o bloqueadores de receptores de angiotensina.<sup>54</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Recomendaciones</b></font></p>     <blockquote>       <p align="justify"><font face="verdana" size="2">1. Para la prevenci&oacute;n primaria de enfermedad coronaria en HTAS, el descenso de la presi&oacute;n arterial es apropiado, con una cifra meta &lt;&nbsp;130/80 mm Hg en individuos con alguna de las siguientes caracter&iacute;sticas: diabetes mellitus, falla renal cr&oacute;nica, enfermedad coronaria o riesgo de sufrirla, enfermedad arterial carot&iacute;dea o perif&eacute;rica, aneurisma de aorta abdominal; pacientes de alto riesgo, definido como aqu&eacute;llos con una escala de riesgo de Framingham del 10% a 10 a&ntilde;os; y cifras meta &lt;&nbsp;140/90 mm Hg en individuos con ninguno de los factores antes se&ntilde;alados.</font></p>       ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">2. En pacientes con presi&oacute;n arterial diast&oacute;lica y enfermedad coronaria con evidencia de isquemia mioc&aacute;rdica, la presi&oacute;n arterial deber&aacute; disminuirse lentamente; deber&aacute;n evitarse descensos de la presi&oacute;n diast&oacute;lica por debajo de 60 mm Hg si el paciente tiene diabetes mellitus o es mayor de 60 a&ntilde;os de edad. En Individuos ancianos con HTAS con presi&oacute;n de pulso amplia, el descenso de la presi&oacute;n sist&oacute;lica puede causar valores muy bajos de presi&oacute;n arterial diast&oacute;lica (&lt; 60 mm Hg). Esta situaci&oacute;n requiere vigilancia de signos o s&iacute;ntomas que pudieran ser relacionados a isquemia mioc&aacute;rdica. En personas mayores de 80 a&ntilde;os de edad, la terapia antihipertensiva es efectiva para reducir el riesgo de evento vascular cerebral, pero la evidencia para la reducci&oacute;n en eventos coronarios es menos contundente.</font></p>       <p align="justify"><font face="verdana" size="2">3. Existe un consenso general que la cantidad de reducci&oacute;n de la presi&oacute;n arterial, m&aacute;s que la elecci&oacute;n del f&aacute;rmaco antihipertensivo, es el principal determinante de la reducci&oacute;n del riesgo cardiovascular; sin embargo, hay suficiente evidencia en los estudios cl&iacute;nicos que apoyanel uso de un IECA o bloqueador de receptores de angiotensina, calcio&#150;antagonistas o tiazidas como medicamentos de primera elecci&oacute;n, complementados por un segundo f&aacute;rmaco si el control de la presi&oacute;n arterial no se consigue con monoterapia. La mayor&iacute;a de los pacientes requerir&aacute;n 2 o m&aacute;s medicamentos para alcanzar el objetivo, y cuando la presi&oacute;n arterial est&aacute; 20/10 mm Hg por arriba de la cifra meta, 2 medicamentos deber&aacute;n utilizarse desde el principio. En pacientes asintom&aacute;ticos posterior al infarto del miocardio, el beta&#150; bloqueador es m&aacute;s apropiado para la prevenci&oacute;n secundaria por al menos 6 meses despu&eacute;s de ocurrido el infarto y es el medicamento de primera elecci&oacute;n si el paciente tiene angina de pecho.</font></p> </blockquote>     <p align="justify"><font face="verdana" size="2"><b>Tratamiento de la HTAS en pacientes con enfermedad coronaria y angina estable</b></font></p>     <p align="justify"><font face="verdana" size="2">En este grupo de pacientes el tratamiento de la HTAS se dirige a la prevenci&oacute;n de muerte, infarto del miocardio y evento vascular cerebral; as&iacute; mismo a la reducci&oacute;n de la frecuencia y duraci&oacute;n de la isquemia mioc&aacute;rdica y disminuci&oacute;n de los s&iacute;ntomas. Los cambios en el estilo de vida, incluyendo dieta, ingesta de sodio, moderaci&oacute;n en el consumo de alcohol, ejercicio regular, disminuci&oacute;n de peso, suspender el tabaquismo, control de la glucosa y l&iacute;pidos y terapia antiplaquetaria. La atenci&oacute;n de otras enfermedades como el hipotiroidismo y apnea obstructiva del sue&ntilde;o tambi&eacute;n son importantes en pacientes de riesgo. Un objetivo razonable de presi&oacute;n arterial para pacientes hipertensos con enfermedad coronaria demostrada o con riesgo de desarrollarla es 130/80 mm Hg.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Terapia farmacol&oacute;gica Beta&#150;bloqueadores</b></font></p>     <p align="justify"><font face="verdana" size="2">&Eacute;stos, son los medicamentos de primera elecci&oacute;n para el tratamiento de la HTAS en pacientes con enfermedad coronaria y angina<sup>55</sup> ya que mejoran la isquemia y angina gracias a su efecto inotr&oacute;pico y cronotr&oacute;pico negativo. La disminuci&oacute;n de la frecuencia card&iacute;aca aumenta el tiempo de llenado diast&oacute;lico y con ello el tiempo para la perfusi&oacute;n coronaria. Tambi&eacute;n inhiben la liberaci&oacute;n de renina desde el aparato yuxta glomerular. Los agentes cardioselectivos sin actividad simpaticomim&eacute;tica intr&iacute;nseca son usados m&aacute;s frecuentemente. Las contraindicaciones relativas para su uso incluyen disfunci&oacute;n de los nodos sinusaloAV,hipotensi&oacute;n, falla card&iacute;aca descompensada y la enfermedad pulmonar broncorreactividad obstructiva severa. </font></p>     <p align="justify"><font face="verdana" size="2">La enfermedad arterial perif&eacute;rica raramente empeora con el uso de estos agentes y la enfermedad pulmonar no es una contraindicaci&oacute;n absoluta. En pacientes diab&eacute;ticos es necesario tener precauci&oacute;n en aqu&eacute;llos con historia de eventos de hipoglucemia, ya que los beta&#150;bloqueadores pueden enmascarar los s&iacute;ntomas de la hipoglucemia.</font></p>     <p align="justify"><font face="verdana" size="2">El uso de estos f&aacute;rmacos en pacientes con angina, infarto del miocardio previo o falla ventricular tiene una base s&oacute;lida, y con la finalidad de ofrecer prevenci&oacute;n secundaria en todos los pacientes excepto los de bajo riesgo, es una recomendaci&oacute;n clase I del American College of Cardiology/ American Heart Association. A&uacute;n para los pacientes de riesgo m&aacute;s bajo, el peso de la evidencia favorece su uso.<sup>56</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Calcioantagonistas</b></font></p>     <p align="justify"><font face="verdana" size="2">Este grupo de medicamentos sustituyen a los beta&#150;bloqueadores cuando la presi&oacute;n arterial permanece elevada, cuando persiste la angina o cuando los efectos colaterales o alguna contraindicaci&oacute;n lo requieren.<sup>57 </sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Estos f&aacute;rmacos reducen la demanda mioc&aacute;rdica de ox&iacute;geno al disminuir la resistencia vascular perif&eacute;rica, disminuyen la presi&oacute;n arterial y aumentan el aporte de ox&iacute;geno mediante vasodilataci&oacute;n coronaria. Los agentes no dihidropirid&iacute;nicos, diltiazem y verapamil, tambi&eacute;n disminuyen la frecuencia sinusal y retrasan la conducci&oacute;n del nodo AV. Los agentes dihidropirid&iacute;nicos de larga acci&oacute;n son preferidos sobre los no dihidropirid&iacute;nicos en combinaci&oacute;n con bloqueadores adrenorreceptores para evitar la bradicardia excesiva o el bloqueo card&iacute;aco. El diltiazem o verapamil no deben ser usados en pacientes con falla card&iacute;aca,<sup>58</sup> y la nifedipina de corta acci&oacute;n deber&aacute; evitarse ya que puede ocasionar la activaci&oacute;n de un reflejo simp&aacute;tico y agravar la isquemia mioc&aacute;rdica. </font></p>     <p align="justify"><font face="verdana" size="2">Aunque los calcioantagonistas son &uacute;tiles en el tratamiento de la angina, no hay consenso sobre su utilidad en la prevenci&oacute;n de eventos cardiovasculares en pacientes con enfermedad coronaria establecida.</font></p>     <p align="justify"><font face="verdana" size="2">Diferentes estudios han se&ntilde;alado la necesidad de ofrecer un tratamiento agresivo para el control de la presi&oacute;n arterial en pacientes hipertensos considerados de alto riesgo, un objetivo que con frecuencia se consigue con la terapia combinada desde el inicio.<sup>59,60</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Inhibidores de la enzima convertidora de angiotensina (IECA)</b></font></p>     <p align="justify"><font face="verdana" size="2">El uso a largo plazo de estos f&aacute;rmacos en pacientes con enfermedad coronaria que tambi&eacute;n tienen diabetes mellitus y/o disfunci&oacute;n sist&oacute;lica del ventr&iacute;culo izquierdo es una recomendaci&oacute;n muy frecuente y aceptada. Su uso es apropiado para pacientes con enfermedad coronaria e HTAS. El uso de estos f&aacute;rmacos ha mostrado reducci&oacute;n de los eventos cardiovasculares graves en un 20 a 25% cuando se les ha comparado con placebo.<sup>61,62</sup> En otros estudios<sup>63</sup> no se ha encontrado beneficio en la incidencia de muerte de origen cardiovascular, infarto del miocardio o necesidad de revascularizaci&oacute;n coronaria. En otros m&aacute;s se ha mostrado que en hombres, pero no en mujeres, mejores resultados cardiovasculares con IECAS que con diur&eacute;ticos a pesar de reducciones similares de la presi&oacute;n arterial.<sup>64</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Bloqueadores de receptores de angiotensina</b></font></p>     <p align="justify"><font face="verdana" size="2">Se indican en pacientes que hayan sufrido un s&iacute;ndrome coronario agudo con elevaci&oacute;n del ST, en quienes tienen intolerantes a los IECA y fracci&oacute;n de expulsi&oacute;n menor del 40%. En combinaci&oacute;n con IECA son &uacute;tiles en el tratamiento de la falla card&iacute;aca avanzada o persistente, en la fase cr&oacute;nica o en la convalecencia del infarto del miocardio con elevaci&oacute;n del ST. </font></p>     <p align="justify"><font face="verdana" size="2">No se encontr&oacute; diferencia en morbilidad y mortalidad en pacientes con HTAS y alto riesgo de eventos cardiovasculares tratados con valsartan comparado con amlodipino. Por otro lado, valsartan fue tan efectivo como el captopril en pacientes de alto riesgo de eventos cardiovasculares despu&eacute;s de ocurrido un infarto del miocardio.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Diur&eacute;ticos</b></font></p>     <p align="justify"><font face="verdana" size="2">La reducci&oacute;n de eventos cardiovasculares con tiazidas ha sido demostrada ya en diferentes estudios.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Nitratos</b></font></p>     <p align="justify"><font face="verdana" size="2">Los nitratos de larga acci&oacute;n se indican para el tratamiento de angina con respuesta parcial a los beta&#150;bloqueadores y calcio antagonistas en pacientes con HTAS y enfermedad coronaria. Se usan en combinaci&oacute;n con hidralazina en pacientes con falla card&iacute;aca, con o sin HTAS. No deben usarse con inhibidores delafosfodiesterasadel tipo de sildenafil. No han mostrado utilidad en el tratamiento de la HTAS.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Recomendaciones</b></font></p>     <p align="justify"><font face="verdana" size="2">El tratamiento de la enfermedad coronaria sintom&aacute;tica, particularmente el angor pectoris, se dirige a mejorar el dolor y prevenir la progresi&oacute;n de la enfermedad coronaria. La piedra angular de este tratamiento la conforman los beta&#150;bloqueadores, calcio antagonistas y los nitratos. Las estrategias farmacol&oacute;gicas para la prevenci&oacute;n de los eventos cardiovasculares en estos pacientes incluyen a los IECA, bloqueadores de receptores de angiotensina, tiazidas y beta&#150;bloqueadores (particularmente despu&eacute;s del infarto del miocardio), calcio antagonistas, antiagregantes plaquetarios y tratamiento de la dislipidemia.</font></p>     <blockquote>       <p align="justify"><font face="verdana" size="2">1. Los pacientes con HTAS y angina estable cr&oacute;nica deber&aacute;n tratarse con un r&eacute;gimen que incluya un beta&#150;bloqueador; en pacientes con historia de infarto del miocardio previo, un IECA o bloqueador de receptores de angiotensina si existe diabetes mellitus y /o disfunci&oacute;n ventricular, y una tiazida. La combinaci&oacute;n de un beta&#150;bloqueador, IECA o bloqueador de receptores de angiotensina, y una tiazida deber&aacute;n ser considerados en ausencia de infarto del miocardio previo, diabetes mellitus o disfunci&oacute;n ventricular.</font></p>       <p align="justify"><font face="verdana" size="2">2. Si los beta&#150;bloqueadores est&aacute;n contraindicados o producen efectos colaterales intolerables, pueden ser sustituidos por un calcio antagonista no dihidropirid&iacute;nico (diltiazem o verapamil), pero no debe existir disfunci&oacute;n ventricular <i>(Clase Ha; nivel de evidencia B).</i></font></p>       <p align="justify"><font face="verdana" size="2">3. Si la angina o la HTAS contin&uacute;an sin control, puede agregarse un calcio antagonista dihidropirid&iacute;nico de acci&oacute;n prolongada al r&eacute;gimen b&aacute;sico de beta&#150;bloqueador, IECA y tiazida. La combinaci&oacute;n de un medicamento beta&#150;bloqueador y un calcio antagonista no dihidropirid&iacute;nico (diltiazem o verapamil) deben usarse con precauci&oacute;n en pacientes con enfermedad coronaria sintom&aacute;tica e HTAS debido al incremento del riesgo de bradiarritmias y falla card&iacute;aca.</font></p>       <p align="justify"><font face="verdana" size="2">4. La presi&oacute;n arterial objetivo es &lt;130/80 mm Hg, pero si existe disfunci&oacute;n ventricular, debe considerarse un valor a&uacute;n m&aacute;s bajo &lt;120/80 mm Hg. En pacientes con enfermedad coronaria, la presi&oacute;n arterial deber&aacute; disminuirse lentamente y evitar descensos de la presi&oacute;n arterialdiast&oacute;lica menores de 60 mm Hg. En ancianos con HTAS con presi&oacute;n de pulso amplia, el descenso de la presi&oacute;n sist&oacute;lica puede causar valores de presi&oacute;n diast&oacute;lica muy bajos (&lt; 60 mm Hg).</font></p>       <p align="justify"><font face="verdana" size="2">5. No hay contraindicaciones especiales en pacientes hipertensos para usar nitratos, antiagregantes plaquetarios o anticoagulantes, o hipolipemiantes para el tratamiento de la angina y la prevenci&oacute;n de los eventos coronarios, excepto en HTAS severa no controlada en pacientes que reciben antiagregantes plaquetarios o anticoagulantes, en quienes la presi&oacute;n arterial deber&aacute; disminuirse para reducir el riesgo de evento vascular cerebral hemorr&aacute;gico.</font></p> </blockquote>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Tratamiento de la HTAS en pacientes con s&iacute;ndromes coronarios agudos: Angina inestable e infarto del miocardio sin elevaci&oacute;n del ST</b></font></p>     <p align="justify"><font face="verdana" size="2">Hay poca informaci&oacute;n acerca del impacto del tratamiento para la HTAS en este grupo de pacientes. La prevalencia de HTAS en pacientes con infarto del miocardio sin elevaci&oacute;n del ST es del 50%. Este grupo de pacientes lo conforman hombre y mujeres de edad m&aacute;s avanzada, de raza negra y aqu&eacute;llos con una prevalencia m&aacute;s alta de otros factores de riesgo como diabetes mellitus, hiperlipidemia, infarto del miocardio o evento vascular cerebral previos, historia de falla card&iacute;aca y revascularizaci&oacute;n previa. </font></p>     <p align="justify"><font face="verdana" size="2">La HTAS es uno de varios factores de riesgo cl&aacute;sicos para el desarrollo de enfermedad coronaria, y es un marcador de riesgo independiente para el objetivo principal compuesto: mortalidad y eventos isqu&eacute;micos recurrentes.<sup>65</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Terapias anti&#150;isqu&eacute;micas y </b><b>anti&#150;hipertensivas</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Nitroglicerina</b></font></p>     <p align="justify"><font face="verdana" size="2">Por v&iacute;a intravenosa, la nitroglicerina es efectiva en la reducci&oacute;n de la presi&oacute;n arterial y sus s&iacute;ntomas.<sup>66</sup> Su uso requiere monitorizaci&oacute;n por la posibilidad de efectos adversos potenciales, como la hipotensi&oacute;n profunda que puede agravar la isquemia mioc&aacute;rdica. Los pacientes con mayor riesgo incluyen ancianos, la hipovolemia y aquellos que hubieran usado sildenafil en las &uacute;ltimas 24 horas. La tolerancia a los nitrates es un problema que puede presentarse a&uacute;n dentro de las primeras 24 horas; debe intentarse disminuir este fen&oacute;meno reduciendo la dosis intravenosa e implementando dosificaci&oacute;nintermitenteporv&iacute;ano intravenosa una vez que el paciente se encuentre estable desde el punto de vista isqu&eacute;mico.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Beta&#150;bloqueadores</b></font></p>     <p align="justify"><font face="verdana" size="2">Estudios recientes han demostrado los beneficios de estos f&aacute;rmacos en combinaci&oacute;n con nitratos en pacientes que no los recib&iacute;an previamente. Otros an&aacute;lisis han aportado evidencia que sugiere que la adici&oacute;n de estos f&aacute;rmacos es &uacute;til en pacientes con dolor tor&aacute;cico persistente. En estos &uacute;ltimos, podr&aacute;n ser iniciados por v&iacute;a intravenosa en ausencia de contraindicaciones, seguidos por administraci&oacute;n oral cuando el paciente se encuentre estable.<sup>67 </sup></font></p>     <p align="justify"><font face="verdana" size="2">La elecci&oacute;n del beta&#150;bloqueador se basa en criterios farmacocin&eacute;ticos y de efectos colaterales, pero en general se prefieren aquellos cardiose&#150;lectivos sin actividad simpaticomim&eacute;tica intr&iacute;nseca (metoprolol y bisoprolol). Los f&aacute;rmacos de acci&oacute;n m&aacute;s corta como esmolol, pueden preferirse en un evento agudo. Si el paciente se encuentra inestable, deber&aacute; postergarse el inicio del beta&#150;bloqueador hasta tener mejor&iacute;a de la falla card&iacute;aca. Las contraindicaciones para el uso de estos f&aacute;rmacos en s&iacute;ndromes coronarios agudos incluyen: bloqueo AV de primer grado con intervalo PR mayor a 0.24 segundos, bloqueo AV de segundo o tercer grado, broncoespasmo severo y la falla card&iacute;aca descompensada. Los beta&#150;bloqueadores cardioselectivos no producen efectos respiratorios adversos cl&iacute;nicamente significativos en pacientes con reactividad bronquial leve a moderada.<sup>68,69</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Bloqueadores de los canales de calcio</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En el tratamiento de pacientes con angina inestable o infarto del miocardio sin elevaci&oacute;n del segmento ST con isquemia recurrente o cuando los beta&#150;bloqueadores est&eacute;n contraindicados, puede usarse un calcioantagonista no dihidropirid&iacute;nico (verapamil o diltiazem) como medida inicial en ausencia de disfunci&oacute;n ventricular izquierda o alguna otra contraindicaci&oacute;n. </font></p>     <p align="justify"><font face="verdana" size="2">Estos agentes previenen o mejoran los s&iacute;ntomas y la isquemia del mismo modo que lo hacen los beta&#150;bloqueadores. Se ha demostrado la reducci&oacute;n de muerte e infarto del miocardio no fatal pacientes con s&iacute;ndromes coronarios agudos, cuando se les administr&oacute; verapamil intravenoso al momento de su admisi&oacute;n y despu&eacute;s por v&iacute;a oral. En otro estudio se demostr&oacute; la reducci&oacute;n significativa en reinfarto y angina refractaria.<sup>70&#150;72 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Algunos estudios incluso han considerado segura la administraci&oacute;n de verapamil y diltiazem may en presencia de disfunci&oacute;n ventricular izquierda.<sup>73,74</sup> Sin embargo, es prudente evitar el uso de estos medicamentos en estas condiciones, y definitivamente no deben ser usados junto a beta&#150;bloqueadores en esa situaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"><b>IECA y Bloqueadores de receptores de angiotensina</b></font></p>     <p align="justify"><font face="verdana" size="2">Podr&aacute;n prescribirse si persiste la HTAS, si existe disfunci&oacute;n ventricular o diabetes mellitus. La administraci&oacute;n oral o intravenosa depende de la estabilidad del paciente. En pacientes con disfunci&oacute;n ventricular despu&eacute;s de infarto del miocardio sin elevaci&oacute;n del ST, los bloqueadores de receptores de angiotensina han mostrado ser una excelente alternativa.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Diur&eacute;ticos</b></font></p>     <p align="justify"><font face="verdana" size="2">Aunque las tiazidas tienen un papel fundamental en el control a largo plazo de la presi&oacute;n arterial, en un cuadro agudo los diur&eacute;ticos son utilizados para pacientes con evidencia de aumento de las presiones de llenado, congesti&oacute;n pulmonar o falla card&iacute;aca.</font></p>     <p align="justify"><font face="verdana" size="2">La HTAS tiene una alta prevalencia en pacientes con s&iacute;ndromes coronarios agudos, muchos de ellos son ancianos. La mayor&iacute;a responder&aacute; a las formas est&aacute;ndar de tratamiento. Los beneficios de tratar la HTAS en los s&iacute;ndromes coronarios agudos tal vez tengan mayor impacto sobre la morbilidad y mortalidad a largo plazo, pero depende de la eficacia del control fuera del hospital.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Recomendaciones</b></font></p>     <blockquote>       ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">1. En angina inestable o infarto del miocardio sin elevaci&oacute;n del ST, la terapia inicial de la HTAS deber&aacute; incluir beta&#150;bloqueadores de corta acci&oacute;n selectivos sin actividad simpaticomim&eacute;tica intr&iacute;nseca, por v&iacute;a intravenosa, adem&aacute;s de nitratos para el control de los s&iacute;ntomas. Los beta&#150;bloqueadores por v&iacute;a oral pueden ser sustituidos en etapas posteriores. De forma alternativa, los beta&#150; bloqueadores por v&iacute;a oral pueden iniciarse sin el uso previo de la administraci&oacute;n intravenosa. Si el paciente se encuentra hemodin&aacute;micamente inestable, el inicio de la terapia con beta&#150;blo&#150;queadores deber&aacute; retrasarse hasta que se consiga estabilizar la falla card&iacute;aca. Se pueden agregar diur&eacute;ticos para el control de la presi&oacute;n arterial y para el tratamiento de la falla card&iacute;aca.</font></p>       <p align="justify"><font face="verdana" size="2">2. Si existe contraindicaci&oacute;n para el uso de un beta&#150;bloqueador, o si existen efectos indeseables, pueden utilizarse calcio antagonistas no dihidropirid&iacute;nicos, como verapamil o diltiazem, siempre y cuando no exista disfunci&oacute;n ventricular izquierda. Si la HTAS no es controlada con un beta&#150;bloqueador solo, puede agregarse un calcio antagonista de mayor acci&oacute;n dihidropirid&iacute;nico o una tiazida.</font></p>       <p align="justify"><font face="verdana" size="2">3. Si el paciente se encuentra estable, un IECA <i>(Clase I; nivel de evidencia A) </i>o un bloqueador de receptores de angiotensina <i>(Clase I; nivel de evidencia B) </i>podr&aacute;n agregarse si el paciente tiene un infarto del miocardio anterior, si persiste con HTAS, si hay evidencia de disfunci&oacute;n ventricular o falla card&iacute;aca o si existe diabetes mellitus.</font></p>       <p align="justify"><font face="verdana" size="2">4. El objetivo de presi&oacute;n arterial es menor de 130/80 mm Hg. Sin embargo, en pacientes presi&oacute;n diast&oacute;lica elevada y s&iacute;ndromes coronarios agudos, la presi&oacute;n arterial deber&aacute; disminuirse lentamente, y deber&aacute; tenerse precauci&oacute;n de no inducir descenso de la presi&oacute;n diast&oacute;lica menor de 60 mm Hg. En pacientes ancianos con HTAS con presi&oacute;n de pulso amplia, el descenso de la presi&oacute;n sist&oacute;lica puede causar valores muy bajos de la presi&oacute;n diast&oacute;lica (&lt; 60 mm Hg).</font></p>       <p align="justify"><font face="verdana" size="2">5. No hay contraindicaciones especiales en pacientes hipertensos para el uso de nitratos, anticoagulantes, antiagregantes plaquetarios o hipolipemiantes para el tratamiento de los s&iacute;ndromes coronarios agudos. Por la misma raz&oacute;n, la presi&oacute;n arterial deber&aacute; disminuirse sin retraso en pacientes con HTAS que reciben antiagregantes plaquetarios o anticoagulantes</font></p> </blockquote>     <p align="justify"><font face="verdana" size="2">Tratamiento de la HTAS en pacientes con infarto agudo del miocardio con elevaci&oacute;n del segmento ST</font></p>     <p align="justify"><font face="verdana" size="2">El impacto de la HTAS sobre el infarto del miocardio con elevaci&oacute;n del ST no est&aacute; bien descrito. Por tanto, aunque el tratamiento agudo para el infarto del miocardio puede incluir agentes antihipertensivos, se conoce poco sobre el tratamiento apropiado de la HTAS en la fase aguda del infarto. </font></p>     <p align="justify"><font face="verdana" size="2">La historia de HTAS aumenta el riesgo de muerte despu&eacute;s de ocurrido un infarto del miocardio con elevaci&oacute;n del ST, pero el significado pron&oacute;stico de la presi&oacute;n arterial en la presentaci&oacute;n del infarto no est&aacute; bien definido.<sup>75 </sup></font></p>     <p align="justify"><font face="verdana" size="2">La mayor parte de las escalas de riesgo existentes describen a la hipotensi&oacute;n como un predictor negativo de sobrevida.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Terapias anti&#150;isqu&eacute;micas y anti&#150;hipertensivas Nitroglicerina</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">A pesar de que la nitroglicerina ha sido de elecci&oacute;n para el tratamiento de la angina e hipertensi&oacute;n, no hay suficiente nivel de evidencia del beneficio de esta pr&aacute;ctica. No se ha encontrado diferencias en mortalidad con el uso de este medicamento.<sup>76,77</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por tanto, las gu&iacute;as internacionales no recomiendan el uso de nitroglicerina para reducir los eventos isqu&eacute;micos, s&oacute;lo para mejorar el dolor isqu&eacute;mico, la hipertensi&oacute;n aguda o tratar el edema pulmonar.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Beta&#150;bloqueadores</b></font></p>     <p align="justify"><font face="verdana" size="2">Estos agentes son la elecci&oacute;n para disminuir la frecuencia card&iacute;aca, contractilidad y con ello la demanda de ox&iacute;geno. Sus beneficios han quedado demostrados en diversos estudios que incluyen su administraci&oacute;n desde las etapas iniciales de un s&iacute;ndrome coronario y que se extienden hasta la etapa de convalecencia.<sup>78&#150;82</sup></font></p>     <p align="justify"><font face="verdana" size="2">Su administraci&oacute;n intravenosa en etapas tempranas del infarto del miocardio consigui&oacute; reducir de forma significativa la aparici&oacute;n de reinfarto y fibrilaci&oacute;n ventricular aunque hubo un incremento en la incidencia de choque cardiog&eacute;nico cuando se administr&oacute; a pacientes con inestabilidad hemodin&aacute;mica.<sup>83</sup> La hipertensi&oacute;n no es una contraindicaci&oacute;n para la administraci&oacute;n intravenosa temprana de estos f&aacute;rmacos en ausencia de inestabilidad hemodin&aacute;mica.</font></p>     <p align="justify"><font face="verdana" size="2"><b>IECA</b></font></p>     <p align="justify"><font face="verdana" size="2">Los IECA reducen la expansi&oacute;n del infarto y el proceso de remodelado de la cavidad card&iacute;aca, previniendo de esa forma las secuelas como arritmias ventriculares, falla o ruptura ventricular.<sup>84,85 </sup>Su administraci&oacute;n temprana ha demostrado un beneficio consistente con reducci&oacute;n en mortalidad a las 4 semanas de ocurrido el infarto, especialmente en pacientes de alto riesgo.<sup>86</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Bloqueadores de receptores de angiotensina</b></font></p>     <p align="justify"><font face="verdana" size="2">Este grupo de medicamentos son una alternativa &uacute;til a los IECA. Valsartan ha demostrado ser tan efectivo como el captopril para reducir los eventos cardiovascularesenpacientesdealto riesgo, aunque la combinaci&oacute;n de valsartan con captopril aument&oacute; el &iacute;ndice de eventos adversos sin mejor&iacute;a en la sobrevida. </font></p>     <p align="justify"><font face="verdana" size="2">El estudio OPTIMAAL mostr&oacute; una tendencia a incrementar la mortalidad en pacientes que recibieron losartan comparado con los que recibieron captopril pero estos resultados negativos pueden ser relacionados a la dosificaci&oacute;n empleada en el estudio.<sup>87</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Antagonistas de aldosterona</b></font></p>     <p align="justify"><font face="verdana" size="2">La espironolactona y eplerenona adem&aacute;s de disminuir la presi&oacute;n arterial tienen un efecto protector secundario en pacientes con falla card&iacute;aca severa despu&eacute;s del infarto del miocardio. En el estudio EPHESUS se encontr&oacute; una reducci&oacute;n de mortalidad del 15% a 16 meses con el uso de eplerenona. Se observ&oacute; disminuci&oacute;n de la mortalidad desde los primeros 30 d&iacute;as, lo que enfatiza el beneficio de la inhibici&oacute;n temprana del SRAA y la necesidad de iniciar esta terapia antes del egreso hospitalario.<sup>88</sup></font></p>     <p align="justify"><font face="verdana" size="2">Estos medicamentos deben evitarse en pacientes con creatinina o potasio s&eacute;ricos elevados.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Calcio antagonistas</b></font></p>     <p align="justify"><font face="verdana" size="2">En general, estos agentes no han mostrado utilidad en la fase aguda del infarto, y tienen un incremento potencial en la mortalidad, independientemente de la estrategia de reperfusi&oacute;n empleada.<sup>89,90</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los calcio antagonistas de larga acci&oacute;n dihidropirid&iacute;nicos se prefieren despu&eacute;s de infarto agudo del miocardio cuando persisten las manifestaciones de isquemia o para el control de la frecuencia ventricular cuando no hay respuesta a los beta&#150;bloqueadores o estos &uacute;ltimos est&aacute;n contraindicados.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Diur&eacute;ticos</b></font></p>     <p align="justify"><font face="verdana" size="2">Aunque estos agentes tienen un rol importante en el tratamiento de la HTAS y descompensaciones de la falla card&iacute;aca, su utilidad en la fase aguda del infarto no ha sido demostrada.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La hipertensi&oacute;n arterial es un factor de riesgo independiente muy importante para el desarrollo de coronariopat&iacute;a, enfermedad vascular cerebral y nefropat&iacute;a. Existen factores neurohumorales y hemodin&aacute;micos comunes en la fisiopatolog&iacute;a de la hipertensi&oacute;n y el desarrollo de enfermedad coronaria que deben ser considerados al establecer estrategias de tratamiento y prevenci&oacute;n, con la finalidad de disminuir la mortalidad cardiovascular. El espectro de la cardiopat&iacute;a coronaria es muy amplio y por ende las estrategias de tratamiento de la hipertensi&oacute;n arterial deben adecuarse a la variedad de enfermedad coronaria que se presente. El tratamiento simult&aacute;neo de ambas condiciones requiere lineamientos espec&iacute;ficos seg&uacute;n la forma de presentaci&oacute;n de cada una de estas patolog&iacute;as.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Rosendorff C, Black HR, Cannon CP, et al: <i>Treatment of Hypertension in the Prevention and Management of Ischemic Heart Disease. 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