<?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>0120-0011</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[rev.fac.med.]]></abbrev-journal-title>
<issn>0120-0011</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-00112005000200006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[DIETA Y ENFERMEDAD CORONARIA]]></article-title>
<article-title xml:lang="en"><![CDATA[Diet and coronary health disease]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora Pabón]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2005</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<fpage>98</fpage>
<lpage>106</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-00112005000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-00112005000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-00112005000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las enfermedades cardiocerebrovasculares, entre ellas la enfermedad coronaria, constituyen un problema de salud pública en Colombia, siendo la primera causa de muerte en población mayor de 45 años. Existen diversos factores relacionados con la alimentación que se han asociado consistentemente con la aparición de estas enfermedades como el alto consumo de grasa saturada, ácidos grasos trans (AGT), colesterol, carbohidratos y sodio, entre otros. El proceso de cuidado nutricional del individuo con enfermedad coronaria comprende la evaluación nutricional, la determinación de requerimientos nutricionales y de las características de la dieta y una evaluación constante para efectuar los ajustes necesarios. Este paciente requiere la atención integral por parte del equipo de salud, con un criterio interdisciplinario, en donde el papel del profesional nutricionista dietista es esencial para llevar a cabo el proceso de cuidado nutricional anteriormente descrito.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Cardiovascular diseases, such as the coronary disease are a problem of public health in Colombia, being the first cause of death in people older than 45 years old. There are many factors related to food that have been strongly associated with the existence of these diseases, for instance: a high intake of saturated fat, trans fatty acids (TFA), cholesterol, carbohydrates and sodium, among others. The process of nutritional care of the person with coronary disease involves nutritional assessment, the determination of the nutritional requirements and the constant surveillance in order to do the necessary changes. This patient needs integral attention from the health team, with an interdisciplinary criterion; the role of the dietician is very important in order to carry out the process of nutritional care previously described.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[dieta]]></kwd>
<kwd lng="es"><![CDATA[nutrición]]></kwd>
<kwd lng="es"><![CDATA[enfermedad coronaria]]></kwd>
<kwd lng="es"><![CDATA[cardiopatía isquémica]]></kwd>
<kwd lng="es"><![CDATA[factores de riesgo]]></kwd>
<kwd lng="es"><![CDATA[infarto del miocardio]]></kwd>
<kwd lng="en"><![CDATA[diet]]></kwd>
<kwd lng="en"><![CDATA[nutrition]]></kwd>
<kwd lng="en"><![CDATA[coronary heart disease]]></kwd>
<kwd lng="en"><![CDATA[myocardial infarction]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	<font face="verdana" size="2"> 	    <p align="right"><b>LA OPINI&Oacute;N DEL EXPERTO</b></p> 	    <p><b>    <center><font face="verdana" size="4">DIETA Y ENFERMEDAD CORONARIA.</font></center></b></p> 	    <p>&nbsp;</p> 	    <p><b>    <center><font face="verdana" size="3">Diet and coronary health disease.</font></center></b></p> 	    <p>&nbsp;</p> 	    <p><b>Guillermo Mora Pab&oacute;n<sup>1</sup></b></p> 	 	    <p><sup><b>1.</b></sup>M&eacute;dico Internista,Cardi&oacute;logo.Electrofisi&oacute;logo, Profesor Asociado,Facultad de Medicina,Universidad Nacional de Colombia, Bogot&aacute;. 	    ]]></body>
<body><![CDATA[<br>Correspondencia:<a href="mailto:gmorap@unal.edu.co">gmorap@unal.edu.co</a></p> 	    <p>&nbsp;</p>  <hr size="1"> 	 	    <p><b>Resumen</b></p> 	 	    <p>Las enfermedades cardiocerebrovasculares, entre ellas la enfermedad coronaria, constituyen un problema de salud p&uacute;blica en Colombia, siendo la primera causa de muerte en poblaci&oacute;n mayor de 45 a&ntilde;os.</p> 	 	    <p>Existen diversos factores relacionados con la alimentaci&oacute;n que se han asociado consistentemente con la aparici&oacute;n de estas enfermedades como el alto consumo de grasa saturada, &aacute;cidos grasos trans (AGT), colesterol, carbohidratos y sodio, entre otros.</p> 	 	    <p>El proceso de cuidado nutricional del individuo con enfermedad coronaria comprende la evaluaci&oacute;n nutricional, la determinaci&oacute;n de requerimientos nutricionales y de las caracter&iacute;sticas de la dieta y una evaluaci&oacute;n constante para efectuar los ajustes necesarios. Este paciente requiere la atenci&oacute;n integral por parte del equipo de salud, con un criterio interdisciplinario, en donde el papel del profesional nutricionista dietista es esencial para llevar a cabo el proceso de cuidado nutricional anteriormente descrito.</p>    	    <p><b>Palabras claves:</b> dieta, nutrici&oacute;n, enfermedad coronaria, cardiopat&iacute;a isqu&eacute;mica, factores de riesgo, infarto del miocardio.</p> 	<hr size="1"> 	    <p><b>Summary</b></p> 	 	    <p>Cardiovascular diseases, such as the coronary disease are a problem of public health in Colombia, being the first cause of death in people older than 45 years old.</p> 	 	    <p>There are many factors related to food that have been strongly associated with the existence of these diseases, for instance: a high intake of saturated fat, trans fatty acids (TFA), cholesterol, carbohydrates and sodium, among others.  The process of nutritional care of the person with coronary disease involves nutritional assessment, the determination of the nutritional requirements and the constant surveillance in order to do the necessary changes.</p> 	 	    ]]></body>
<body><![CDATA[<p>This patient needs integral attention from the health team, with an interdisciplinary criterion; the role of the dietician is very important in order to carry out the process of nutritional care previously described.</p> 	 	    <p><b>Key words:</b> diet, nutrition, coronary heart disease, myocardial infarction.</p> 	<hr size="1"> 	 	    <p><b>PUNTO DE VISTA DEL CARDI&Oacute;LOGO</b></p> 	 	    <p><b><font face="verdana" size="3">Introducci&oacute;n</font></b></p> 	 	    <p>La enfermedad coronaria es una patolog&iacute;a muy com&uacute;n y es la primera causa de muerte en el hemisferio occidental. En el &uacute;ltimo congreso de la Federaci&oacute;n Mundial de Cardiolog&iacute;a se present&oacute; un estudio que estima que hay 17 millones de muertes anuales relacionadas con esta patolog&iacute;a (1), lo que constituye un problema de salud p&uacute;blica. En un reciente estudio (2) se demostr&oacute; que en Colombia m&aacute;s del 50&#37; de pacientes que consultan a una unidad de dolor tor&aacute;cico de un hospital general, presentan s&iacute;ndrome coronario agudo como diagn&oacute;stico de egreso.</p> 	 	    <p>Adem&aacute;s de la alta mortalidad producida por la enfermedad coronaria es claro que el manejo de esta patolog&iacute;a se relaciona con altos costos.  Se ha estimado que para el 2005 en Estados Unidos esta enfermedad producir&aacute; costos directos e indirectos por alrededor de 142.1 miles de millones de d&oacute;lares (3).</p> 	 	    <p>Bajo este panorama al paciente que se hospitaliza por s&iacute;ndrome coronario agudo o el paciente ambulatorio con enfermedad coronaria cr&oacute;nica se le prescribe &quot;dieta coronaria&quot;. Sin embargo para muchos m&eacute;dicos no es claro a que se refiere este t&eacute;rmino. Esta revisi&oacute;n pretende mostrar las bondades de ciertos tipos de dietas, la evidencia disponible sobre la utilidad de las mismas tanto en prevenci&oacute;n primaria como en prevenci&oacute;n secundaria y el beneficio que pueden traer para esta poblaci&oacute;n de pacientes.  Varios estudios epidemiol&oacute;gicos encontraron relaci&oacute;n directa entre las dietas con altos consumo de grasas saturadas y colesterol y la arterioesclerosis y la enfermedad coronaria (4).  Igualmente se encontr&oacute; m&aacute;s alta incidencia de enfermedad coronaria en inmigrantes a Estados Unidos, que ten&iacute;an cambios en sus h&aacute;bitos de consumo diet&eacute;tico con respecto a sus pa&iacute;ses de origen (5). Por ello las instrucciones diet&eacute;ticas son la primera l&iacute;nea de terapia en prevenci&oacute;n y tratamiento de la enfermedad coronaria (5). La hip&oacute;te	sis de grasa y coraz&oacute;n puede ser considerada simplista dado que los efectos de la dieta en enfermedad coronaria pueden ser mediados por otras v&iacute;as biol&oacute;gicas diferentes al colesterol de baja densidad, y se incluyen el colesterol de alta densidad, los triglic&eacute;ridos, la lipoprote&iacute;na (a) (6), la presi&oacute;n sangu&iacute;nea, la tendencia tromb&oacute;tica, el ritmo card&iacute;aco, la funci&oacute;n endotelial, la inflamaci&oacute;n sist&eacute;mica, la sensibilidad a la insulina, el estr&eacute;s oxidativo, los niveles de homociste&iacute;na u otras (7). En una antigua revisi&oacute;n se describieron 246 posibles factores de riesgo para enfermedad coronaria, de estos 46 pueden estar relacionados con la dieta (8). Dentro de los m&aacute;s conocidos tenemos &aacute;cidos grasos (9), fibra (10), colesterol (11), sodio (12), vitaminas C y E (13,14), isoflavones derivados de la soya (15), esteroles de plantas obtenidos de aceites de semillas (16), arginina (17), folato (18), vitamina B6 (19), magnesio (20), flavonoides (21) y carotenoides (22).</p> 	 	    <p><b><font face="verdana" size="3">Efectos metab&oacute;licos de los &aacute;cidos grasos</font></b></p> 	 	    <p>Desde 1950 se ha investigado la relaci&oacute;n entre consumo de grasa en la dieta y l&iacute;pidos plasm&aacute;ticos, confirm&aacute;ndose una relaci&oacute;n directa entre mayor consumo de grasas saturadas (provenientes de carnes y algunos aceites vegetales) y niveles plasm&aacute;ticos de colesterol total y colesterol LDL (23).</p> 	 	    <p>Sin embargo las grasas proveen &aacute;cidos grasos esenciales y favorece la absorci&oacute;n de vitaminas y nutrientes fundamentales. Hacen parte de la s&iacute;ntesis de membranas, modifican prote&iacute;nas y carbohidratos de elementos celulares y solubilizan componentes polares y no polares de constituyentes celulares y extracelulares (24).</p> 	 	    ]]></body>
<body><![CDATA[<p>Los &aacute;cidos grasos se clasifican en tres tipos:</p> 	 	    <p>saturados, monoinsaturados y polinsaturados.  Si en la dieta no hay &aacute;cidos grasos saturados, la mayor&iacute;a son sintetizados a partir de carbohidratos. Los &aacute;cidos grasos saturados provienen generalmente de grasas de origen animal (24).</p> 	 	    <p>Aunque hay controversia en muchas de las die-tas recomendadas para enfermedad coronaria, existe un consenso alrededor de los efectos delet&eacute;reos de los &aacute;cidos grasos trans. Estos se encuentran en margarinas, productos de panader&iacute;a, aceites mantenidos por mucho tiempo a altas temperaturas (por ejemplo sitios de venta de fritos como papas, longaniza etc). Los &aacute;cidos grasos trans elevan los niveles de colesterol LDL y triglic&eacute;ridos y disminuyen el colesterol HDL (25). Adem&aacute;s incrementan los niveles plasm&aacute;ticos de lipoproteina (a) (26), inducen disfunci&oacute;n endotelial (27), resistencia a la insulina (28) y aumentan el riesgo de diabetes (29). Basado en estos elementos es recomendable evitar el consumo de este tipo de alimentos.  Los &aacute;cidos grasos monoinsaturados est&aacute;n presentes en el aceite de oliva y de canola, en algunos productos derivados de la leche y en aceites parcialmente hidrogenados. Estos &aacute;cidos monoinsaturados disminuyen la oxidaci&oacute;n de colesterol LDL (30) y cuando reemplazan los &aacute;cidos grasos satura	dos disminuyen el colesterol LDL sin mayor cambio en el colesterol HDL (31). Un asunto importante es que si no se cambian los &aacute;cidos grasos saturados por los monoinsaturados, si no que estos &uacute;ltimos se agregan a la dieta, se a&ntilde;ade importante cantidad de calor&iacute;as y aumenta el riesgo de obesidad.</p> 	 	    <p>Los &aacute;cidos grasos polinsaturados de origen vegetal (familia n-6) se encuentran en aceites de ma&iacute;z y tienen la capacidad de disminuir el colesterol total, el colesterol LDL y en menor grado el colesterol HDL. Mejoran la sensibilidad a la insulina y disminuyen el riesgo de diabetes tipo 2 cuando sustituyen los &aacute;cidos grasos saturados (32). Hay un gran inter&eacute;s adem&aacute;s por &aacute;cidos grasos n-3 que est&aacute;n presentes en aceites de pescado.  Han demostrado disminuir los niveles de colesterol total, colesterol LDL y triglic&eacute;ridos, con m&iacute;nimos cambios en colesterol HDL.</p> 	 	    <p><b>Evidencia de los diferentes tipos de dieta</b></p> 	 	    <p><b>Dieta baja en carbohidratos</b></p> 	 	    <p>La dieta baja en carbohidratos fue postulada por William Banting en 1860 (33), pero recibi&oacute; atenci&oacute;n mundial gracias a un libro Atkins, presentado como una &quot;nueva revoluci&oacute;n diet&eacute;tica&quot; (34).  La dieta de Atkins recomienda dos semanas de restricci&oacute;n extrema de carbohidratos seguida por incrementos, en las siguientes semanas, de carbohidratos a 35 gr&#47;d&iacute;a.</p> 	 	    <p>La dieta tiene 68&#37; de sus calor&iacute;as como grasas, 27&#37; como prote&iacute;nas y 5&#37; como carbohidratos.  El argumento a favor de esta dieta es que la ingesta alta de az&uacute;cares y carbohidratos refinados incrementan la producci&oacute;n de insulina y esta lleva a dep&oacute;sitos grasos y elevaci&oacute;n de los triglic&eacute;ridos. Se considera que la restricci&oacute;n de carbohidratos hace que se movilicen los dep&oacute;sitos grasos y favorece la p&eacute;rdida de peso, ya que se inicia un proceso de cetosis y las cetonas excretadas en la orina inducen la disminuci&oacute;n de peso por su efecto diur&eacute;tico. Esta dieta se acompa&ntilde;a de restricci&oacute;n cal&oacute;rica puesto que el alto consumo de grasa produce p&eacute;rdida de la sensaci&oacute;n de hambre (35). Se han publicado estudios aleatorizados (36-39) en los cuales se encuentra disminuci&oacute;n de peso entre 4-6 kg a los seis meses, pero en dos de estos estudios que tienen seguimiento m&aacute;s largo, se muestra que en los siguientes 12 meses no hay diferencias significativas (36,37). Al evaluar los resultados en el perfil lip&iacute;dico se encuentra aumen	to del colesterol HDL y triglic&eacute;ridos y ning&uacute;n cambio o aumento del colesterol total y colesterol LDL. La principal limitaci&oacute;n de esta dieta es su falta de prueba en pacientes con patolog&iacute;a cardiovascular, ya que los estudios se han concentrado en pacientes con sobrepeso y los efectos en el colesterol LDL. Al igual que otras dietas bajas en carbohidratos existe preocupaci&oacute;n por las potenciales deficiencias nutricionales, el da&ntilde;o renal y la osteoporosis.</p> 	 	    <p><b>Dietas basadas en el &iacute;ndice glic&eacute;mico</b></p> 	 	    <p>Son las conocidas dietas &quot;South Beach&quot; (40), &quot;Sugar Busters&quot; (41) y &quot;Zone Diet&quot; (42). En estas dietas se permite el consumo de carbohidratos en la medida que tienen bajo &iacute;ndice glic&eacute;mico. El &iacute;ndice glic&eacute;mico es la medida de la respuesta de la glicemia a la ingesta de un carbohidrato (43), a mayor glicemia posprandial mayor el &iacute;ndice glic&eacute;mico. A continuaci&oacute;n se presentan los valores de &iacute;ndice glic&eacute;mico de algunos alimentos: glucosa 100, hojuelas de ma&iacute;z 92, papas 85, pan blanco 70, coca cola 63, zanahoria 47, espagueti 41, manzana 40, lentejas 29, man&iacute; 13 (44). Se ha encontrado que las dietas con alto &iacute;ndice glic&eacute;mico incrementan la sensaci&oacute;n de hambre y aumentan los &aacute;cidos grasos libres, con lo que puede aumentar el riesgo de obesidad, diabetes y enfermedad cardiovascular (45).</p> 	 	    ]]></body>
<body><![CDATA[<p>La dieta &quot;South Beach&quot; incluye un per&iacute;odo de dos semanas de extrema restricci&oacute;n de carbohidratos con posterior reultraducci&oacute;n de carbohidratos con bajo &iacute;ndice glic&eacute;mico, se estimula la ingesta de frutas, vegetales, granos enteros, &aacute;cidos grasos mono y polinsaturados, &aacute;cidos omega-3, nueces con moderado consumo de productos l&aacute;cteos. Sin embargo no hay estudios en pacientes con enfermedad coronaria, ya sea en prevenci&oacute;n primaria o secundaria (44).  Por otra parte las dietas con bajo &iacute;ndice glic&eacute;mico muestran disminuci&oacute;n del colesterol HDL (45).</p> 	 	    <p><b>Dietas muy bajas en grasas</b></p> 	 	    <p>En estas dietas se recomienda que las calor&iacute;as producidas por las grasas sean menores al 15&#37; y que se distribuyan por igual entre &aacute;cidos grasos saturados, monoinsaturados y polinsaturados. Las otras calor&iacute;as se distribuyen entre carbohidratos (70&#37;) y prote&iacute;nas (15&#37;).</p> 	 	    <p>Esta dieta se ha evaluado en pacientes con enfermedad coronaria encontr&aacute;ndose, en el Ornish Life Style Heart Trial (46), disminuci&oacute;n en la aparici&oacute;n de eventos card&iacute;acos de 2.5 veces durante un seguimiento de cinco a&ntilde;os, acompa&ntilde;ado de regresi&oacute;n o poca progresi&oacute;n de placas ateromatosas coronarias, evaluadas por coronariograf&iacute;a. Pese a estos resultados favorables, el grupo de dieta muy baja en grasa ten&iacute;a otras intervenciones como ejercicio aer&oacute;bico moderado, suspensi&oacute;n del cigarrillo, entrenamiento para el manejo del estr&eacute;s y un grupo de soporte sicosocial que hacen dif&iacute;cil atribuir exclusivamente a la dieta los beneficios observados e incluso podr&iacute;an hacer pensar que son los otros cambios en el estilo de vida los responsables del beneficio.</p> 	 	    <p>Otros estudios han evaluado esta dieta en el contexto de la dislipidemia demostrando disminuci&oacute;n en colesterol total, colesterol LDL y triglic&eacute;ridos (47,48). Nuevamente los resultados aunque atractivos no pueden atribuirse solamente a la dieta, ya que en el grupo de intervenci&oacute;n se insist&iacute;a en ejercicio vigoroso.</p> 	 	    <p>En conclusi&oacute;n aunque los resultados de la dieta muy baja en grasa son alentadores se necesitan nuevos estudios en los que se controle el ejercicio y la modificaci&oacute;n de otros factores de riesgo cardiovascular, para que se pueda valorar la verdadera eficacia de esta dieta.</p> 	 	    <p><b>Dieta Mediterr&aacute;nea</b></p> 	 	    <p>Se caracteriza por el consumo diario de frutas, vegetales, cereales no refinados, aceite de oliva y productos l&aacute;cteos. Adem&aacute;s consumo moderado de pescado, carne de aves, nueces, papa y huevos (tres veces por semana). Por &uacute;ltimo bajo consumo de carnes rojas (aproximadamente cuatro veces al mes) y consumo diario de vino (49).  La utilidad de esta dieta se apreci&oacute; en el estudio de los siete pa&iacute;ses (50) cuando se document&oacute; que la mortalidad por enfermedad coronaria y otras causas fue menor en las regiones mediterr&aacute;neas (particularmente en la isla de Creta) comparada con Estados Unidos. Aunque el contenido de grasa es realmente alto (40&#37; de las calor&iacute;as) la presencia de &aacute;cidos grasos polinsaturados omega 3 y &aacute;cidos grasos monoinsaturados ejercen un efecto cardioprotector (51). Esta dieta es baja en grasas saturadas, teniendo una relaci&oacute;n de monoinsaturada-saturada de 2:1. De igual forma la relaci&oacute;n omega 6: omega 3 es de 1-2:1, comparada con la relaci&oacute;n 16:1 en Estados Unidos (51).</p> 	 	    <p><b><font face="verdana" size="3">&aacute;cidos grasos omega 3</font></b></p> 	 	    <p>Se ha hecho gran &eacute;nfasis en el consumo, en esta dieta, de &aacute;cidos grasos omega 3. Dos de ellos, el &aacute;cido eicosapentanoico (EPA) y el docosahexanoico (DHA) se encuentran en pescados como salm&oacute;n, sardinas, at&uacute;n, arenque o trucha (52).  Estos &aacute;cidos grasos son considerados cardioprotectores. El &aacute;cido alfa linol&eacute;ico (ALA) es otro omega-3 que se encuentra en las plantas como nueces, aceite de canola y aceite de soya.  El ALA puede ser convertido a EPA y DHA.  Los &aacute;cidos grasos omega-3 llamaron la atenci&oacute;n de los investigadores cuando se encontr&oacute; que la poblaci&oacute;n esquimal de Groenlandia ten&iacute;a menores frecuencias de muerte por enfermedad cardiovascular que la poblaci&oacute;n Danesa pese a manejar niveles semejantes de colesterol. Se encontr&oacute; que la dieta esquimal era rica en grasas omega-3 proveniente de ballenas, focas y pescados (51). Los &aacute;cidos grasos omega-3 son &aacute;cidos grasos polinsaturados de cadena larga (18-22 carbonos) con el primer doble enlace carbono-carbono localizado en el tercer carbono (Omega-3). Se ha e		ncontrado que tienen propiedades vasorelajantes mejorando la funci&oacute;n endotelial posiblemente por incrementar la producci&oacute;n vascular de &oacute;xido n&iacute;trico (53). Otro efecto importante es la capacidad antiarr&iacute;tmica, ellos han demostrado disminuci&oacute;n de muerte cardiaca s&uacute;bita en pacientes posinfarto (54). Finalmente se han encontrado tambi&eacute;n propiedades antiagregantes plaquetarias y antinflamatorias al atenuar la expresi&oacute;n de c&eacute;lulas de adhesi&oacute;n molecular (55,56).</p> 	 	    ]]></body>
<body><![CDATA[<p>Otro efecto favorable de los &aacute;cidos grasos omega-3 es su actividad en la variabilidad de la frecuencia card&iacute;aca. La disminuci&oacute;n de la variabilidad de la frecuencia card&iacute;aca es un predictor de mortalidad total y muerte card&iacute;aca s&uacute;bita en pacientes posinfarto. El consumo de &aacute;cidos grasos Omega-3 afecta favorablemente el comportamiento de la variabilidad de frecuencia card&iacute;aca (57).</p> 	 	    <p>Existen varios estudios epidemiol&oacute;gicos que confirman los potenciales beneficios encontrados en estudios de ciencias b&aacute;sicas. El estudio de salud de m&eacute;dicos (58) evalu&oacute; 20551 m&eacute;dicos hombres y encontr&oacute; que aquellos que consum&iacute;an pescado al menos una vez por semana disminu&iacute;an su riesgo de muerte s&uacute;bita en un 58&#37; (P = 0.03) comparado con aquellos que lo hac&iacute;an una vez al mes. En el sexo femenino, el estudio de enfermeras encontr&oacute; que el consumo de pescado dos o m&aacute;s veces al mes se asocio a menor riesgo de enfermedad coronaria fatal, al igual que el consumo de aceite de oliva y de soya (59).</p> 	 	    <p>No todos los estudios muestran iguales resultados, pero en ellos la poblaci&oacute;n que menos consume pescado lo hace al menos una vez por semana, lo que sugiere que el efecto protector del consumo de pescado se logra con muy peque&ntilde;as cantidades y explicar&iacute;a los diferentes resultados (60,61).</p> 	 	    <p><b><font face="verdana" size="3">Frutas y Vegetales</font></b></p> 	 	    <p>Otro elemento importante de la dieta mediterr&aacute;nea es el consumo de frutas y vegetales. La mayor&iacute;a de los estudios encuentran efecto protector cardiovascular con el consumo de estos alimentos (62). Por la gran cantidad de nutrientes en las frutas y vegetales es dif&iacute;cil asignar a una sustancia espec&iacute;fica el efecto ben&eacute;fico por su consumo. Pese a ello se ha intentado determinar como algunos componentes de la frutas, por ejemplo las vitaminas, pueden desempe&ntilde;ar un efecto cardioprotector.</p> 	 	    <p>Se ha demostrado que los niveles altos de homociste&iacute;na se asocian a mayor riesgo de enfermedad coronaria y a mayor mortalidad (62,63). El consumo de &aacute;cido f&oacute;lico y vitaminas B6 y B12 puede normalizar la homociste&iacute;na plasm&aacute;tica aunque su efecto en morbimortalidad por enfermedad coronaria no se ha demostrado (19).</p> 	 	    <p>Se investig&oacute; el uso de alfa tocoferol para prevenci&oacute;n de enfermedad coronaria, sin embargo este suplemento no demostr&oacute; utilidad en estudios controlados. Es importante anotar que el tocoferol usado (alfa tocoferol) no es el m&aacute;s adecuado (65). En la naturaleza se evidencia una mezcla de tocoferoles como gama, delta y alfa en relaci&oacute;n 5:2:1 respectivamente. Algunos estudios han encontrado que en la medida que aumenta el alfa tocoferol se pierde el efecto antioxidante (66).</p> 	 	    <p>Las nueces han llamado la atenci&oacute;n de los investigadores, y han pasado de ser un simple &quot;pasabocas&quot; a convertirse en un alimento cardiosaludable (67). En el Adventist Health Study (68) se encontr&oacute;, al seguimiento durante seis a&ntilde;os, que a mayor consumo de nueces (m&aacute;s de cinco veces por semana) disminu&iacute;a el riesgo de infarto fatal. Resultados semejantes se encontraron en el estudio de enfermeras (69).</p> 	 	    <p>Aunque las nueces y otros productos semejantes (man&iacute;, almendras, pistachos) tienen alto contenido de grasas la mayor&iacute;a son &aacute;cidos grasos mono y polinsaturados. Son adem&aacute;s ricas en arginina (precursor del &oacute;xido n&iacute;trico) que podr&iacute;a mejorar la disfunci&oacute;n endotelial y en &aacute;cido alfa linol&eacute;ico (70,71).</p> 	 	    <p>Por &uacute;ltimo el consumo de granos enteros se asocia a menor riesgo de enfermedades cardiovasculares aun despu&eacute;s del ajuste por ingesta de folatos, fibra y vitamina E. Estos efectos se demostraron en el estudio de mujeres de Iowa (72) y en el de enfermeras (73).</p> 	 	    ]]></body>
<body><![CDATA[<p><b>Estudios cl&iacute;nicos de dieta mediterr&aacute;nea</b></p> 	 	    <p>El Lyon Diet Heart Study (74) fue el primer estudio cl&iacute;nico que demostr&oacute; los efectos ben&eacute;ficos de la dieta mediterr&aacute;nea. Se evaluaron 605 pacientes posinfarto, en el grupo experimental se alentaba el consumo de pan, vegetales verdes, frutas a diario, m&aacute;s pescado y menos carnes rojas (reemplazadas por carnes de aves) y una margarina rica en &aacute;cido alfa linol&eacute;ico. El seguimiento demostr&oacute; reducci&oacute;n significativa de infarto y disminuci&oacute;n de eventos card&iacute;acos y mortalidad total. El grupo control recib&iacute;a una dieta NCEP tipo I (sugerida por la asociaci&oacute;n americana de coraz&oacute;n), que es la com&uacute;nmente recomendada en prevenci&oacute;n primaria. El an&aacute;lisis de los resultados mostr&oacute; que el n&uacute;mero necesario a tratar para disminuir un evento era de 23 pacientes.  Estos efectos favorables se presentaron sin cambios significativos en colesterol total, HDL o LDL.</p> 	 	    <p>El estudio indomediterr&aacute;neo aleatoriz&oacute; el efecto de la dieta indomediterr&aacute;nea rica en &aacute;cido alfa linol&eacute;ico en pacientes con enfermedad coronaria o en alto riesgo de padecerla. El grupo de intervenci&oacute;n fue instruido en el consumo de frutas, vegetales, nueces, granos enteros y semilla de mostaza o aceite de soya. El grupo de control ten&iacute;a dieta NCEP tipo I. Despu&eacute;s de dos a&ntilde;os de seguimiento hubo una sustancial reducci&oacute;n de infarto no fatal, muerte s&uacute;bita y mortalidad total.  Hubo mayor reducci&oacute;n en colesterol total, colesterol LDL y triglic&eacute;ridos en el grupo de dieta indomediterr&aacute;nea (75).</p> 	 	    <p>El estudio DART (76) evalu&oacute; intervenciones diet&eacute;ticas en pacientes posinfarto. El grupo experimental fue alentado a disminuir el consumo de grasa, incrementar en el consumo de pescado y de cereales. Nuevamente el grupo experimental mostr&oacute; menos eventos cardiovasculares. El n&uacute;mero necesario a tratar fue de 28 por dos a&ntilde;os.  Con estos resultados es evidente que la dieta mediterr&aacute;nea es asociada con disminuci&oacute;n de los eventos coronarios sin que se pueda establecer espec&iacute;ficamente cual de sus componentes (vitaminas, &aacute;cidos grasos omega-3, flavanoides etc.) es el responsable de este efecto.</p> 	 	    <p><b><font face="verdana" size="3">Conclusiones</font></b></p> 	 	    <p>La dieta hace parte de las necesidades y placeres del hombre y tambi&eacute;n, se ha relacionado con el desarrollo de enfermedades cardiovasculares. Una vez encontrada esta relaci&oacute;n se ha propuesto que cambios diet&eacute;ticos pueden servir para prevenir el desarrollo de enfermedad coronaria o para disminuir su recurrencia.</p> 	 	    <p>Las dietas bajas en carbohidratos han demostrado disminuci&oacute;n aguda de peso pero no hay evidencia de prevenci&oacute;n primaria o secundaria de enfermedad coronaria. Un concepto semejante se puede extender a dietas basadas en el &iacute;ndice glic&eacute;mico. Las dietas bajas en grasas sugieren resultados ben&eacute;ficos pero est&aacute;n alteradas por la introducci&oacute;n de otros elementos ben&eacute;ficos como ejercicio y manejo del estr&eacute;s.  Finalmente la dieta mediterr&aacute;nea ha demostrado disminuir eventos coronarios. Su efecto por ahora debe estar relacionado con una mezcla adecuada de ciertas sustancias presentes en esta dieta que conllevan a un efecto cardioprotector y que no pueden ser reemplazada por f&oacute;rmulas farmac&eacute;uticas que se pretenden vender como las &quot;causantes&quot; del beneficio de esta dieta. Bajo este contexto se debe recomendar a los pacientes con enfermedad coronaria el consumo de frutas y vegetales frescos, consumo de pescado, nueces, carne de aves y disminuir el consumo de carnes rojas y evitar el consumo de &aacute;cidos grasos trans.</p> 	 	    <p>Aunque estas son recomendaciones generales no se debe olvidar el papel b&aacute;sico que tiene la nutricionista, para la formulaci&oacute;n de una dieta adecuada dependiendo de la comorbilidad que tiene la mayor&iacute;a de estos pacientes, como por ejemplo diabetes o hipertensi&oacute;n arterial sist&eacute;mica.</p> 	 	    <p><b><font face="verdana" size="3">Referencias</font></b></p> 	 	    <!-- ref --><p>1.<a href="http://www.worldheart.org"target="blank">http://www.worldheart.org</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000072&pid=S0120-0011200500020000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Mora G, Franco R, Fajardo H et al. Caracter&iacute;sticas cl&iacute;nicas y electrocardiogr&aacute;ficas de los pacientes que ingresan a una unidad de dolor tor&aacute;cico en el contexto de la nueva definici&oacute;n de infarto agudo de miocardio.  Rev Colom Cardiol 2005; 11: 333-42.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000073&pid=S0120-0011200500020000600002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p> 	 	    <!-- ref --><p>3. Amercan Heart Association. 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