<?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>S1405-99402008000400011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Manifestaciones cardiovasculares en el lupus eritematoso generalizado]]></article-title>
<article-title xml:lang="en"><![CDATA[Cardiovascular manifestations of systemic lupus erythematosus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-León Mandujano]]></surname>
<given-names><![CDATA[Amir]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Amezcua-Guerra]]></surname>
<given-names><![CDATA[Luis Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Cardiología Geriátrica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Inmunología ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>78</volume>
<numero>4</numero>
<fpage>421</fpage>
<lpage>430</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402008000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402008000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402008000400011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La pericarditis es la manifestación cardíaca más frecuente en pacientes con LEG, aunque las lesiones valvulares y la afección miocárdica y vascular pueden ocurrir. En el pasado, las manifestaciones cardíacas eran graves y ponían en riesgo la vida. Sin embargo, las opciones terapéuticas actuales han hecho que estas manifestaciones ahora sean frecuentemente asintomáticas y de bajo riesgo. Las oclusiones vasculares (incluyendo a las arterias coronarias) pueden ser condicionadas por aterosclerosis prematura, arteritis o por la frecuente asociación del LEG con el síndrome de anticuerpos antifosfolípidos. La aterosclerosis prematura es la causa más frecuente de enfermedad arterial coronaria en pacientes con LEG. Las terapias actuales permiten controlar la mayor parte de eventos de actividad lúpica; sin embargo, predisponen al desarrollo de un abanico de manifestaciones clínicas que presupone un nuevo reto diagnóstico y terapéutico para el clínico moderno.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Pericarditis is the most common cardiac manifestation in systemic lupus erythematosus (SLE) patients, although lesions of valves, myocardium and coronary arteries may also occur. In the past, cardiac abnormalities were severe and life threatening. Nowadays, cardiac manifestations are often mild and asymptomatic. However, they can be easily recognized by echocardiography and other novel tests. Vascular occlusion, including coronary vessels, may develop due to vasculitis, premature atherosclerosis or antiphospholipid antibodies. Premature atherosclerosis is the most frequent cause of coronary artery disease in SLE patients. Efforts should be made to control traditional risk factors as well as all other factors that are intrinsic to SLE, which could contribute to atherosclerotic plaque development.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lupus eritematoso generalizado]]></kwd>
<kwd lng="es"><![CDATA[Afección cardiovascular]]></kwd>
<kwd lng="es"><![CDATA[Aterosclerosis]]></kwd>
<kwd lng="en"><![CDATA[Systemic lupus erythematosus]]></kwd>
<kwd lng="en"><![CDATA[Cardiovascular involvement]]></kwd>
<kwd lng="en"><![CDATA[Atherosclerosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Revisi&oacute;n de temas cardiol&oacute;gicos</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Manifestaciones cardiovasculares en el lupus eritematoso generalizado</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Cardiovascular manifestations of systemic lupus erythematosus</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Amir G&oacute;mez&#150;Le&oacute;n Mandujano,* Luis Manuel Amezcua&#150;Guerra**</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 Geri&aacute;trica. Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez. M&eacute;xico. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i>** Departamento de Inmunolog&iacute;a. Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez. M&eacute;xico.</i></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>Correspondencia: </b>    <br> <i>Dr. Luis Manuel Amezcua&#150;Guerra.    <br> Departamento de Inmunolog&iacute;a,     <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>  Tel&eacute;fono: 5573&#150;2911, ext. 1255.</i>     <br> E&#150;mail: <a href="mailto:lmamezcuag@gmail.com">lmamezcuag@gmail.com</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: 29 de enero de 2007     <br> Aceptado: 10 de octubre de 2007</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 pericarditis es la manifestaci&oacute;n card&iacute;aca m&aacute;s frecuente en pacientes con LEG, aunque las lesiones valvulares y la afecci&oacute;n mioc&aacute;rdica y vascular pueden ocurrir. En el pasado, las manifestaciones card&iacute;acas eran graves y pon&iacute;an en riesgo la vida. Sin embargo, las opciones terap&eacute;uticas actuales han hecho que estas manifestaciones ahora sean frecuentemente asintom&aacute;ticas y de bajo riesgo. Las oclusiones vasculares (incluyendo a las arterias coronarias) pueden ser condicionadas por aterosclerosis prematura, arteritis o por la frecuente asociaci&oacute;n del LEG con el s&iacute;ndrome de anticuerpos antifosfol&iacute;pidos. La aterosclerosis prematura es la causa m&aacute;s frecuente de enfermedad arterial coronaria en pacientes con LEG. Las terapias actuales permiten controlar la mayor parte de eventos de actividad l&uacute;pica; sin embargo, predisponen al desarrollo de un abanico de manifestaciones cl&iacute;nicas que presupone un nuevo reto diagn&oacute;stico y terap&eacute;utico para el cl&iacute;nico moderno.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Lupus eritematoso generalizado. Afecci&oacute;n cardiovascular. 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">Pericarditis is the most common cardiac manifestation in systemic lupus erythematosus (SLE) patients, although lesions of valves, myocardium and coronary arteries may also occur. In the past, cardiac abnormalities were severe and life threatening. Nowadays, cardiac manifestations are often mild and asymptomatic. However, they can be easily recognized by echocardiography and other novel tests. Vascular occlusion, including coronary vessels, may develop due to vasculitis, premature atherosclerosis or antiphospholipid antibodies. Premature atherosclerosis is the most frequent cause of coronary artery disease in SLE patients. Efforts should be made to control traditional risk factors as well as all other factors that are intrinsic to SLE, which could contribute to atherosclerotic plaque development.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Systemic lupus erythematosus. Cardiovascular involvement. 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">El lupus eritematoso generalizado (LEG) es una enfermedad cr&oacute;nica de etiolog&iacute;a autoinmune, caracterizada por la presencia de remisiones y exacerbaciones en la actividad de la enfermedad y que puede afectar a cualquier aparato y sistema del organismo. Las manifestaciones cardiovasculares del LEG fueron reconocidas desde principios del siglo XX,<sup>1,2 </sup>aunque su adecuada descripci&oacute;n fue realizada hasta la segunda mitad de ese siglo. Actualmente, con m&eacute;todos altamente sensibles de investigaci&oacute;n cardiovascular, se ha encontrado una pre&#150;valencia de involucro card&iacute;aco del 50%.<sup>3 </sup></font></p>     <p align="justify"><font face="verdana" size="2">La historia evolutiva del LEG es un fiel reflejo del desarrollo de la terap&eacute;utica m&eacute;dica y del advenimiento de nuevas t&eacute;cnicas de diagn&oacute;stico. La llegada de los glucocorticoides al arsenal terap&eacute;utico provey&oacute; al cl&iacute;nico de un f&aacute;rmaco altamente efectivo para las manifestaciones graves del LEG. Sin embargo, su uso trajo aparejado el desarrollo de disfunci&oacute;n metab&oacute;lica, hipertensi&oacute;n arterial sist&eacute;mica (HAS), osteoporosis e incremento en el n&uacute;mero y gravedad de los episodios infecciosos intercurrentes. Una vez abatida la incidencia de muerte asociada a la actividad l&uacute;pica, las infecciones tomaron un papel preponderante como causa de morbilidad y mortalidad en LEG. El uso extendido de agentes antimicrobianos ha logrado relegar a un segundo t&eacute;rmino las infecciones como causa de muerte en pacientes con LEG. Actualmente la esperanza de vida en pacientes con LEG es igual o mayor al 90% a 10 a&ntilde;os;<sup>4</sup> sin embargo, este incremento de la supervivencia nos plantea ahora el problema cl&iacute;nico de lidiar con la aterog&eacute;nesis acelerada que subyace a la actividad l&uacute;pica, constituy&eacute;ndose ahora como primera causa de muerte el desarrollo de complicaciones ateros&#150;cler&oacute;ticas cr&oacute;nicas.<sup>5</sup></font></p>     <p align="justify"><font face="verdana" size="2">As&iacute;, un adecuado conocimiento del tipo de involucro que prevalece en la actualidad es indispensable para el cl&iacute;nico moderno, quien se enfrenta con nuevos y diferentes retos diagn&oacute;sticos y terap&eacute;uticos en pacientes con esta enfermedad y como resultado del inevitable efecto delet&eacute;reo que la terapia farmacol&oacute;gica presenta.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Afecci&oacute;n peric&aacute;rdica</b></font></p>     <p align="justify"><font face="verdana" size="2">La pericarditis es una de las manifestaciones m&aacute;s caracter&iacute;sticas de la enfermedad y est&aacute; incluida como uno de los criterios de clasificaci&oacute;n del Colegio Americano de Reumatolog&iacute;a para LEG. El estudio ecocardiogr&aacute;fico muestra alteraciones peric&aacute;rdicas hasta en el 54% de pacientes, aunque frecuentemente se detectan m&aacute;s sus secuelas que la presencia de pericarditis cl&iacute;nicamente manifiesta.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2">En la mayor&iacute;a de los casos la pericarditis aguda se presenta asociada a derrame pleural y los s&iacute;ntomas son similares a los que se presentan en los enfermos en general, incluyendo dolor precordial y disnea. Los signos incluyen fiebre, taquicardia, ruidos card&iacute;acos apagados y, en pacientes con taponamiento o pericarditis constrictiva, la presi&oacute;n venosa yugular se encuentra aumentada y el pulso yugular es prominente. En el taponamiento card&iacute;aco, la onda de pulso venoso "x" es prominente y la "y" se encuentra ausente. En la pericarditis constrictiva la "y" es prominente y la presi&oacute;n venosa no se modifica con la inspiraci&oacute;n (signo de Kussmaul). En algunos pacientes es posible escuchar frote peric&aacute;rdico. El electrocardiograma puede demostrar depresi&oacute;n del segmento PR y elevaci&oacute;n diseminada del segmento ST. En ocasiones, la &uacute;nica evidencia de pericarditis nos la proporciona la evaluaci&oacute;n electrocardiogr&aacute;fica de la enfermedad. El derrame peric&aacute;rdico puede ser documentado por radiograf&iacute;a de t&oacute;rax s&oacute;lo cuando la cantidad de l&iacute;quido es elevada, mientras que la ecocardiograf&iacute;a es el m&eacute;todo est&aacute;ndar para su detecci&oacute;n. El involucro peric&aacute;rdico aparece m&aacute;s frecuentemente al inicio de la enfermedad y durante los brotes agudos de actividad, usualmente en asociaci&oacute;n con actividad en otros &oacute;rganos. El dep&oacute;sito de inmunoglobulinas y C3 detectado por inmunofluorescencia directa apoya el papel de los inmunocomplejos en el desarrollo de la pericarditis.<sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2">El taponamiento card&iacute;aco es un evento poco frecuente y se estima su incidencia en menos del 1%, aunque en series peque&ntilde;as o seleccionadas puede ser mayor.<sup>8</sup> El cuadro cl&iacute;nico incluye disnea progresiva, ausencia de ruidos card&iacute;acos a la auscultaci&oacute;n, hipotensi&oacute;n arterial, aumento de la presi&oacute;n venosa yugular y pulso parad&oacute;jico. Si el taponamiento es de instalaci&oacute;n aguda, el derrame puede ser escaso. Debido a la baja frecuencia del taponamiento, existen pocos trabajos que analicen las caracter&iacute;sticas del derrame; sin embargo, es notorio que en la mayor&iacute;a de los casos se demuestre una marcada leucocitosis con predominio de neutr&oacute;filos (en ocasiones mayor al 90%) con niveles de glucosa significativamente menores a su contraparte s&eacute;rica. Es claro que las caracter&iacute;sticas del derrame pueden sugerir la presencia de pericarditis bacteriana, por lo que este &uacute;ltimo diagn&oacute;stico debe tenerse en mente y en todos los casos descartarse mediante los estudios apropiados. La presencia de pericarditis bacteriana ha sido reportada en un peque&ntilde;o n&uacute;mero de pacientes con LEG bajo tratamiento con glucocorticoides y su mortalidad es elevada. El microorganismo aislado con mayor frecuencia (al igual que en la poblaci&oacute;n general) es el <i>Staphylococcus aureus, </i>aunque se pueden encontrar microorganismos poco frecuentes como <i>Salmonella spp.<sup>9 </sup></i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">No se ha demostrado que la b&uacute;squeda de anticuerpos antinucleares, niveles de complemento o c&eacute;lulas LE en el l&iacute;quido del derrame tenga alguna utilidad de car&aacute;cter diagn&oacute;stico o cl&iacute;nico y en ning&uacute;n caso su presencia descarta la posibilidad de que coexista la serositis l&uacute;pica con un proceso infeccioso. La pericarditis de tipo constrictivo suele presentarse pocas semanas despu&eacute;s de un evento agudo de derrame peric&aacute;rdico, a&uacute;n cuando este &uacute;ltimo haya sido apropiadamente manejado y resuelto. Aunque puede presentarse sin relaci&oacute;n con los glucocorticoides, se ha sugerido que el uso de &eacute;stos puede influir para que la resoluci&oacute;n del evento inflamatorio se convierta en un proceso fibr&oacute;tico en lugar de serofibrinoso, como normalmente ocurre.<sup>10 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Los anti&#150;inflamatorios no esteroideos (AINE) y/o los glucocorticoides (prednisona &#150;PDN&#150;0.5 mg/kg/d&iacute;a) son efectivos en la pericarditis leve. En casos m&aacute;s graves y en el taponamiento card&iacute;aco, se requieren dosis m&aacute;s elevadas de glucocorticoides, frecuentemente administrados en bolos intravenosos (1 g de metilpre&#150;dnisolona diario por tres d&iacute;as). En pacientes con pericarditis recurrente, el uso de inmuno&#150;supresi&oacute;n cr&oacute;nica con metotrexato, azatioprina o mofetil micofenolato es ben&eacute;fico. En casos de afecci&oacute;n hemodin&aacute;mica grave se requiere drenaje mediante pericardiocentesis o ventana peric&aacute;rdica.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Afecci&oacute;n mioc&aacute;rdica</b></font></p>     <p align="justify"><font face="verdana" size="2">La miocarditis es la manifestaci&oacute;n m&aacute;s caracter&iacute;stica del involucro mioc&aacute;rdico en LEG. Actualmente, la miocarditis cl&iacute;nica es poco frecuente, informada en 7 a 10% de los casos.<sup>11</sup> Sin embargo, antes de la llegada de los glucocorticoides su prevalencia lleg&oacute; a ser informada hasta en un 40 a 60% en series de necropsias. Parece ser que esta discrepancia es debida en parte a que la afecci&oacute;n subcl&iacute;nica es mucho m&aacute;s frecuente y que &eacute;sta se encuentra presente en una mayor proporci&oacute;n de pacientes que mueren como consecuencia del LEG.<sup>7,10,12</sup></font></p>     <p align="justify"><font face="verdana" size="2">Mediante ecocardiograf&iacute;a es posible demostrar hipocinesia global sugestiva de miocarditis en el 6% de los pacientes con LEG.<sup>12&#150;18</sup> Aunque se ha demostrado por medio de biopsia el car&aacute;cter autoinmune en algunos pacientes,<sup>7,19</sup> es claro que la mayor&iacute;a de los casos de disfunci&oacute;n mioc&aacute;rdica est&aacute;n relacionados m&aacute;s bien con entidades espec&iacute;ficas como una crisis hipertensiva en portadores de HAS, enfermedad coronaria por aterosclerosis prematura, vasculitis coronaria, valvulopat&iacute;a, insuficiencia renal, anemia o calcifilaxis.<sup>20&#150;24</sup> Aunque frecuentemente utilizada para tratar la miocarditis asociada a LEG, la ciclofosfamida puede inducir cardiotoxicidad (incluyendo miocarditis) independientemente de la dosis acumulada total.<sup>25 </sup></font></p>     <p align="justify"><font face="verdana" size="2">En el estudio anatomopatol&oacute;gico la miocarditis se caracteriza por edema intersticial, degeneraci&oacute;n fibrinoide de la col&aacute;gena, agregados focales de c&eacute;lulas plasm&aacute;ticas, monocitos, linfocitos y algunos neutr&oacute;filos en el intersticio miofibrilar, as&iacute; como focos aislados de necrosis y fibrosis sin relaci&oacute;n anat&oacute;mica con estenosis u oclusi&oacute;n coronaria. Estas alteraciones pueden presentarse en cualquier regi&oacute;n del miocardio, sin importar si se encuentra involucrado alg&uacute;n elemento del sistema de conducci&oacute;n el&eacute;ctrica. Adem&aacute;s, el grado de disfunci&oacute;n mioc&aacute;rdica (incluso la presencia de falla card&iacute;aca y miocardiopat&iacute;a dilatada) est&aacute; en relaci&oacute;n directa con la extensi&oacute;n del da&ntilde;o tisular. La distribuci&oacute;n focal del da&ntilde;o sugiere que &eacute;ste es ocasionado por el dep&oacute;sito de complejos inmunes, los que inducen la activaci&oacute;n del sistema del complemento y conducen a inflamaci&oacute;n y da&ntilde;o mioc&aacute;rdico localizado. Es posible que diversos auto&#150;anticuerpos circulantes generen da&ntilde;o de manera directa, dentro de los cuales destacan los anticuerpos anti&#150;ribonucleoprote&iacute;na, anti&#150;miocardio, anti&#150;Ro/SSA y antifosfol&iacute;pidos. El papel patog&eacute;nico espec&iacute;fico de cada uno de estos anticuerpos todav&iacute;a est&aacute; por definirse.<sup>26,27 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Considerando que la mayor parte de los casos son asintom&aacute;ticos, las manifestaciones cl&iacute;nicas son de lo m&aacute;s variado y el diagn&oacute;stico se fundamenta en la sospecha cl&iacute;nica. Al igual que en miocarditis de otra etiolog&iacute;a, los pacientes sintom&aacute;ticos se pueden presentar con fiebre, taquicardia, disnea, palpitaciones y dolor tor&aacute;cico no relacionado con esfuerzo f&iacute;sico o cambios posturales. Se puede encontrar ingurgitaci&oacute;n venosa yugular, taquicardia sin relaci&oacute;n con la temperatura corporal del paciente, ritmo de galope y soplos card&iacute;acos de reciente aparici&oacute;n, cardiomegalia (sin presencia de derrame peric&aacute;rdico) y edema perif&eacute;rico. En el electrocardiograma podemos encontrar cambios inespec&iacute;ficos del segmento ST y de la onda T, defectos de conducci&oacute;n, presencia de complejos ventriculares prematuros y taquicardia tanto supraventricular como ventricular en su origen. En algunos pacientes puede haber una r&aacute;pida progresi&oacute;n hacia disfunci&oacute;n ventricular, cardiomiopat&iacute;a dilatada, formaci&oacute;n de aneurismas ventriculares izquierdos y falla card&iacute;aca. Tambi&eacute;n puede presentarse en asociaci&oacute;n con otras manifestaciones card&iacute;acas del LEG como pericarditis y endocarditis. En raras ocasiones la insuficiencia card&iacute;aca se constituye como la manifestaci&oacute;n inicial del LEG.<sup>28&#150;30</sup></font></p>     <p align="justify"><font face="verdana" size="2">A pesar de que el dolor tor&aacute;cico no es un dato que los pacientes refieran de forma constante, es interesante hacer notar que se puede encontrar elevaci&oacute;n de enzimas de lisis mioc&aacute;rdica, por lo que en esos casos tendr&aacute; que descartarse la presencia de infarto agudo del miocardio (IAM).<sup>20,31 </sup>La toma de biopsia endomioc&aacute;rdica puede ser necesaria para distinguir entre miocarditis y otras causas de miocardiopat&iacute;a (amiloidosis o miopat&iacute;a por hidroxicloroquina), aunque este procedimiento est&aacute; sujeto a errores de muestreo por el car&aacute;cter focal del da&ntilde;o.<sup>32 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Los hallazgos ecocardiogr&aacute;ficos no son espec&iacute;ficos pero muestran datos sugestivos de inflamaci&oacute;n mioc&aacute;rdica y disfunci&oacute;n de la movilidad (81%), sea global, regional o segmentaria, disminuci&oacute;n en la fracci&oacute;n de expulsi&oacute;n e incremento en el tiempo de relajaci&oacute;n isovolum&eacute;trica.<sup>33</sup> Otra t&eacute;cnica no invasiva &uacute;til en la evaluaci&oacute;n de estos pacientes es la medicina nuclear. Los defectos de perfusi&oacute;n mioc&aacute;rdica ocurren hasta en el 50% de los pacientes, independientemente de la presencia de sintomatolog&iacute;a.<sup>34,35 </sup>En el cateterismo card&iacute;aco se ha excluido enfermedad coronaria significativa, lo cual sugiere que los defectos de perfusi&oacute;n se deben a espasmo coronario, fibrosis mioc&aacute;rdica o lesi&oacute;n mioc&aacute;rdica secundaria a involucro microvascular. Comparada con la centelleograf&iacute;a convencional, la tomograf&iacute;a por emisi&oacute;n de fot&oacute;n &uacute;nico (SPECT) detecta una mayor proporci&oacute;n de pacientes con anormalidades de perfusi&oacute;n mioc&aacute;rdica.<sup>36</sup> La inmuno&#150;centelleograf&iacute;a puede ser m&aacute;s espec&iacute;fica para la presencia de miocarditis que la biopsia endomioc&aacute;rdica; sin embargo, se requiere de mayor evidencia para considerarla un m&eacute;todo diagn&oacute;stico &uacute;til en la cl&iacute;nica. La resonancia magn&eacute;tica puede ser &uacute;til en el diagn&oacute;stico de inflamaci&oacute;n mioc&aacute;rdica.<sup>37 </sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La miocarditis, aunque sea leve, requiere tratamiento inmediato con dosis elevadas de glucocorticoides. En las formas graves, es necesario el uso de glucocorticoides intravenosos en pulsos (metilprednisolona 1 g diario por 3 d&iacute;as) continuado por dosis altas de PDN oral. Los inmuno&#150;supresores como la ciclofosfamida, la azatioprina o la inmunoglobulina intravenosa pueden tener efectos ben&eacute;ficos en casos graves o recalcitrantes de miocarditis. Una vez instaurado el tratamiento, tanto los hallazgos cl&iacute;nicos y electrocardiogr&aacute;ficos, como las determinaciones de funci&oacute;n ventricular y los hallazgos histopatol&oacute;gicos se resuelven satisfactoriamente en la mayor parte de los pacientes.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Afecci&oacute;n valvular</b></font></p>     <p align="justify"><font face="verdana" size="2">Se han descrito alteraciones tanto anat&oacute;micas como funcionales en las v&aacute;lvulas card&iacute;acas de pacientes con LEG. La endocarditis de Libman&#150;Sacks, tambi&eacute;n llamada "endocarditis verrucosa at&iacute;pica" es la lesi&oacute;n m&aacute;s caracter&iacute;stica, aunque los engrosamientos valvulares son encontrados con mayor frecuencia.<sup>2</sup> Las lesiones anat&oacute;micas son encontradas en un 15 a 75% de los estudios de necropsia, en 40 a 50% de casos con ecocardiograf&iacute;a transtor&aacute;cica y en 50 a 60% con abordaje transesof&aacute;gico.<sup>38,39 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Las alteraciones anat&oacute;micas son encontradas habitualmente en las v&aacute;lvulas mitral y a&oacute;rtica. Los estudios anatomopatol&oacute;gicos pueden mostrar dos tipos diferentes de verrucosidades: 1) lesiones activas con necrosis focal e infiltraci&oacute;n de c&eacute;lulas mononucleares, m&aacute;s frecuentemente observadas en pacientes j&oacute;venes con inicio reciente de la enfermedad; y 2) lesiones antiguas cicatriciales caracterizadas por tejido fibroso vascularizado asociado con calcificaciones, encontradas en pacientes con enfermedad de larga evoluci&oacute;n y que frecuentemente se asocian con insuficiencia valvular.<sup>12</sup> La asociaci&oacute;n entre anormalidades valvulares y la presencia de anticuerpos antifosfol&iacute;pidos tambi&eacute;n se ha informado,<sup>40</sup> y su evoluci&oacute;n no parece modificarse por la administraci&oacute;n de anticoagulantes orales.<sup>41</sup> De la misma manera, se ha encontrado una mayor frecuencia de anticuerpos anti&#150;Ro/SSA y anti&#150;La/SSB en pacientes con afecci&oacute;n valvular, aunque su papel patog&eacute;nico no est&aacute; dilucidado.<sup>42</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se han postulado dos diferentes hip&oacute;tesis sobre la patog&eacute;nesis de las alteraciones valvulares en LEG: 1) los anticuerpos antifosfol&iacute;pidos y anti&#150;endotelio se unen y activan a las c&eacute;lulas endoteliales, llevando a agregaci&oacute;n plaquetaria con formaci&oacute;n de trombos; o 2) el dep&oacute;sito de los complejos inmunes entre el endotelio y la membrana basal lleva a infiltraci&oacute;n por c&eacute;lulas inflamatorias. Es posible que ambos mecanismos act&uacute;en de manera sin&eacute;rgica.<sup>6 </sup></font></p>     <p align="justify"><font face="verdana" size="2">La endocarditis v&eacute;rmeos a habitualmente es asintom&aacute;tica y rara vez lleva al desarrollo de soplos audibles. Las vegetaciones crecen cerca de los bordes libres de las valvas, por lo que no alteran el sistema de cierre valvular, aun cuando sean grandes y protruyan dentro de las c&aacute;maras card&iacute;acas. Las complicaciones de la endocarditis verrucosa son raras, aunque los eventos emb&oacute;licos pueden ocurrir. Las lesiones hemodin&aacute;micamente significativas se presentan en s&oacute;lo 3 a 4% de los pacientes. La endocarditis infecciosa se observa en un 7% de los pacientes con enfermedad valvular, mientras que el embolismo central o perif&eacute;rico se presenta hasta en un 13%.<sup>39</sup> La incidencia de este hallazgo en los estudios <i>postmortem </i>ha mostrado tendencia hacia su disminuci&oacute;n en los &uacute;ltimos 40 a&ntilde;os, lo cual puede ser resultado del uso generalizado de glucocorticoides. Es probable que, aunado a los efectos terap&eacute;uticos de los glucocorticoides, se favorezca la aparici&oacute;n de un proceso cicatricial con la fibrosis y contracci&oacute;n resultantes a nivel del anillo valvular, y que esto sea lo que explique el aumento en la frecuencia de incompetencia valvular que se ha visto posterior a la introducci&oacute;n de esta terapia.<sup>12</sup></font></p>     <p align="justify"><font face="verdana" size="2">Dado que la endocarditis de Libman&#150;Sacks habitualmente es silente, generalmente no es tratada. Cuando se logra detectar en estadios tempranos y activos, los glucocorticoides (PDN 1 mg/ kg/d&iacute;a) son recomendados, especialmente en aquellos pacientes con anticuerpos antifosfol&iacute;pidos y anticoagulante l&uacute;pico negativos. A diferencia de las lesiones en el s&iacute;ndrome de anticuerpos antifosfol&iacute;pidos, las vegetaciones de Libman&#150;Sacks se pueden resolver con el tratamiento.<sup>39</sup> El da&ntilde;o valvular puede ser tan grave que frecuentemente se requiera su reemplazo por medios quir&uacute;rgicos hasta en un 20% de los pacientes.<sup>43</sup> El cuadro cl&iacute;nico m&aacute;s grave lo representa la insuficiencia a&oacute;rtica y los factores cl&iacute;nicos m&aacute;s com&uacute;nmente asociados a su presencia son la HAS, la v&aacute;lvula a&oacute;rtica bic&uacute;spide y la historia de fiebre reum&aacute;tica.<sup>41</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Afecci&oacute;n del sistema de conducci&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La afecci&oacute;n del sistema de conducci&oacute;n se presenta en un 5 a 10% de pacientes con LEG. Se han descrito bloqueos aur&iacute;culo&#150;ventriculares (primero, segundo o tercer grado), bloqueos de rama del haz de His, taquicardia sinusal, contracciones auriculares prematuras y fibrilaci&oacute;n auricular. Aunque pueden ser condicionadas por el LEG, en algunas ocasiones estas arritmias son el reflejo de enfermedad isqu&eacute;mica coronaria, HAS o disautonom&iacute;a.<sup>44,45</sup> Actualmente hay evidencia que sugiere que la hidroxicloroquina no incrementa de manera significativa el riesgo de arritmias card&iacute;acas, aunque es probable que la cloroquina s&iacute; lo haga.<sup>46</sup> El tipo de ritmo que se presente, la velocidad con la que se instala y la gravedad del mismo, ser&aacute;n responsables de las manifestaciones cl&iacute;nicas del paciente y dictar&aacute;n el tipo de manejo. Habitualmente, los pacientes responden bien con f&aacute;rmacos antiarr&iacute;tmicos, aunque en ocasiones es necesaria la colocaci&oacute;n de un marcapasos.</font></p>     <p align="justify"><font face="verdana" size="2">Los hijos de madres portadoras de anticuerpos anti&#150;Ro/SSA (independientemente de la presencia de LEG) tienen un incremento en el riesgo de presentar bloqueo card&iacute;aco cong&eacute;nito. Hasta una tercera parte de los ni&ntilde;os nacidos con bloqueo card&iacute;aco completo tienen una madre que padece una enfermedad autoinmune del tejido conectivo; se ha informado que el 2 a 3% de los reci&eacute;n nacidos de madres portadoras del anticuerpo anti&#150;Ro/SSA presentar&aacute;n bloqueo A.V. completo.<sup>47,48</sup> En estudios de necropsia se ha documentado la ausencia parcial o completa del tejido de conducci&oacute;n, por lo que se ha sugerido que el da&ntilde;o generado al sistema de conducci&oacute;n est&aacute; mediado por el paso transplacentario de anticuerpos.<sup>49&#150;51</sup> Los anticuerpos anti&#150;Ro/SSA y anti&#150;La/SSB parecen tener un papel patog&eacute;nico directo al unirse a los miocardiocitos en apoptosis, induciendo su opsonizaci&oacute;n y posterior eliminaci&oacute;n.<sup>52</sup> Adicionalmente, se ha mostrado que los cardiocitos residentes participan activamente en la depuraci&oacute;n de los cardiocitos fetales apopt&oacute;ticos. Sin embargo, en presencia de anticuerpos anti&#150;Ro/SSA y anti&#150;La/SSB esta depuraci&oacute;n es inhibida, resultando en la acumulaci&oacute;n de c&eacute;lulas apopt&oacute;ticas que promueven procesos inflamatorios.<sup>53</sup></font></p>     <p align="justify"><font face="verdana" size="2">Una conducta razonable es realizar un escrutinio para la presencia de estos anticuerpos en madres de alto riesgo, y en caso de resultar positivo, realizar una vigilancia ecosonogr&aacute;fica peri&oacute;dica del feto. El tratamiento del bloqueo card&iacute;aco cong&eacute;nito se basa en el uso de esferoides fluorados (dexametasona o betametasona), los cuales son capaces de cruzar la barrera placentaria en su forma activa, limitando el proceso inmune que afecta al coraz&oacute;n fetal.<sup>54</sup> El manejo profil&aacute;ctico de mujeres que previamente han tenido hijos con bloqueo card&iacute;aco a&uacute;n no est&aacute; establecido, m&aacute;xime si consideramos la baja seguridad fetal de los esteroides (abortos espont&aacute;neos, retardo del crecimiento intrauterino e insuficiencia adrenal).<sup>55</sup> Se ha sugerido una gu&iacute;a de vigilancia y tratamiento para el manejo del bloqueo card&iacute;aco cong&eacute;nito.<sup>56</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Afecci&oacute;n coronaria</b></font></p>     <p align="justify"><font face="verdana" size="2">El involucro coronario en LEG fue descrito mucho despu&eacute;s que el resto de las manifestaciones cardiovasculares. &Eacute;ste incluye aterosclerosis, arteritis, trombosis, embolizaci&oacute;n, espasmo coronario y una reserva coronaria disminuida. Un hallazgo m&aacute;s o menos constante en todos los pacientes con LEG es la presencia de proliferaci&oacute;n celular al nivel de la &iacute;ntima y obstrucci&oacute;n focal o difusa de las arterias intramurales por material fibrinoide o hialino. No est&aacute; claro si estos hallazgos corresponden a secuelas de arteritis o de trombosis, ya sea primaria (como consecuencia de la presencia del anticoagulante l&uacute;pico o de los anticuerpos antifosfol&iacute;pidos), o secundaria (debida a la agregaci&oacute;n de plaquetas y neutr&oacute;filos en el lumen de estos vasos). Es posible que estos eventos contribuyan a la fibrosis en parches que frecuentemente se observa en el miocardio de los pacientes con LEG. La manifestaci&oacute;n cl&iacute;nica m&aacute;s com&uacute;n de la enfermedad arterial coronaria es el infarto agudo del miocardio. Muchos de estos pacientes son mujeres premenop&aacute;usicas e inclusive se ha reportado su ocurrencia en ni&ntilde;os. En la actualidad, queda claro que este grupo de pacientes tiene un riesgo incrementado (9 a 50 veces) de presentar un evento coronario agudo si se les compara con sujetos sanos pareados para edad y g&eacute;nero.<sup>57,58</sup></font></p>     <p align="justify"><font face="verdana" size="2">Desde hace tres d&eacute;cadas se describi&oacute; el patr&oacute;n de mortalidad bimodal en pacientes con LEG.<sup>59 </sup>Se observ&oacute; que las muertes que suced&iacute;an temprano en la evoluci&oacute;n de la enfermedad eran secundarias a actividad l&uacute;pica o a complicaciones infecciosas asociadas, mientras que las muertes en etapas posteriores (&gt; 5 a&ntilde;os despu&eacute;s del diagn&oacute;stico) eran frecuentemente asociadas a complicaciones ateroscler&oacute;ticas. Desde entonces, diferentes grupos de estudio han informado sobre una incidencia incrementada de enfermedad isqu&eacute;mica ateroscler&oacute;tica en cohortes de pacientes con LEG de diferente sustrato &eacute;tnico. En cohortes prospectivas de pacientes con LEG, la prevalencia de enfermedad arterial coronaria es de 6 a 10%, con una incidencia estimada de nuevos eventos de 1.2 a 1.5% al a&ntilde;o.<sup>60,61</sup> Estudios de comparaci&oacute;n poblacional han mostrado un incremento global en el riesgo de enfermedad arterial coronaria de 5 a 6 en mujeres con LEG, y esta cifra se eleva hasta 52 cuando se analiza s&oacute;lo el estrato de edad comprendido entre 35 y 44 a&ntilde;os.<sup>58</sup> En mujeres con LEG de 18 a 44 a&ntilde;os, la raz&oacute;n de momios para desarrollar un IAM es de 2.27 (IC 1.08&#150;3.46), para insuficiencia card&iacute;aca congestiva es de 3.8 (IC 2.41&#150;5.19), mientras que para enfermedad vascular cerebral esde2.05(IC1.17&#150;2.93).<sup>62</sup></font></p>     <p align="justify"><font face="verdana" size="2">Adicional al incremento en el riesgo de eventos cardiovasculares adversos, la frecuencia de la enfermedad ateroscler&oacute;tica subcl&iacute;nica tambi&eacute;n parece ser mayor en los pacientes con LEG. En una revisi&oacute;n de autopsias de pacientes con LEG se encontr&oacute; que, independientemente de la causa de muerte, el 52% de los pacientes ten&iacute;an evidencia de aterosclerosis generalizada al momento de su muerte.<sup>63</sup> Despu&eacute;s de recibir gluco&#150;corticoides por m&aacute;s de un a&ntilde;o, el 42% de los pacientes con LEG tiene formaci&oacute;n de placas ateroescler&oacute;ticas en al menos un vaso coronario, y la mitad de ellos tienen historia de IAM. Con el uso de t&eacute;cnicas avanzadas de imagen (SPECT), se ha demostrado que el 40% de los pacientes con LEG tienen anormalidades de perfusi&oacute;n, 27% de los cuales corresponden con defectos fijos consistentes con necrosis mioc&aacute;rdica previa.<sup>64</sup> De la misma manera, la prevalencia de placas ateroescler&oacute;ticas en car&oacute;tidas detectadas por ultrasonido en modo&#150;B es de 29 a 37%, un valor significativamente mayor al encontrado en controles pareados (15%).<sup>65,66</sup></font></p>     <p align="justify"><font face="verdana" size="2">La presencia de angina o IAM ocurre en 2&#150;16% de los pacientes,<sup>67,68</sup> pero es mucho m&aacute;s frecuente la presencia de enfermedad subcl&iacute;nica. La prevalencia tanto en estudios de necropsia como de perfusi&oacute;n mioc&aacute;rdica va de 25 a 45%.<sup>69</sup> Actualmente, se puede considerar que la afecci&oacute;n cardiovascular constituye la causa m&aacute;s com&uacute;n de muerte tard&iacute;a en LEG. </font></p>     <p align="justify"><font face="verdana" size="2">As&iacute;, la evidencia actual apoya la presencia de aterosclerosis acelerada en pacientes con LEG, aunque los factores subyacentes a&uacute;n no est&aacute;n bien esclarecidos. Algunos factores de riesgo cl&aacute;sicos como la HAS y la diabetes mellitus son m&aacute;s prevalentes en pacientes con LEG. Otros cambios metab&oacute;licos como menopausia prematura, insuficiencia renal, hipercolesterolemia, hipertrigliceridemia e hiperhomocisteinemia tambi&eacute;n ocurren m&aacute;s frecuentemente en LEG. Sin embargo, estos factores de riesgo no explican por s&iacute; solos el exceso de riesgo observado, y aun despu&eacute;s de ajustar las cohortes por factores de riesgo la presencia de LEG persiste como una asociaci&oacute;n independiente con la enfermedad ateroscler&oacute;tica.<sup>70</sup> El papel de otros factores que coinciden en el LEG como la presencia de anticuerpos antifosfol&iacute;pidos, la activaci&oacute;n generalizada del sistema del complemento o la presencia de citocinas pro o anti&#150;inflamatorias est&aacute; bajo intensa investigaci&oacute;n.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Despu&eacute;s de la aterosclerosis, la arteritis ocupa el segundo lugar en frecuencia dentro de las manifestaciones coronarias del LEG.<sup>71</sup> La distinci&oacute;n entre aterosclerosis y arteritis coronaria en el escenario cl&iacute;nico es complicada. Tal vez la presencia de vasculitis a otro nivel sugiera m&aacute;s arteritis; sin embargo, la ausencia de actividad del LEG tampoco la descarta por completo.<sup>72</sup> La presencia de arteritis se ha documentado mediante angiograf&iacute;a coronaria. Los aneurismas coronarios o estenosis u oclusiones arteriales de instalaci&oacute;n r&aacute;pida, documentadas mediante estudios seriados, apoyan el diagn&oacute;stico de arteritis coronaria. Tanto la aterosclerosis prematura como la arteritis pueden presentarse en pacientes j&oacute;venes con LEG e inclusive pueden coexistir. Debido a que los estudios de medicina nuclear pueden reportar falsos positivos en pacientes con LEG,<sup>73</sup> frecuentemente es necesario someterlos a evaluaci&oacute;n angiogr&aacute;fica directa para documentar la presencia y etiolog&iacute;a de la enfermedad arterial coronaria.</font></p>     <p align="justify"><font face="verdana" size="2">El manejo de esta manifestaci&oacute;n tambi&eacute;n requiere del uso de glucocorticoides a dosis altas. Sin embargo, reviste una gran importancia definir con seguridad si en realidad se trata de una manifestaci&oacute;n de la actividad del LEG (potencialmente reversible con el tratamiento), ya que el uso de glucocorticoides puede exacerbar el dep&oacute;sito de l&iacute;pidos y con ello la gravedad de la enfermedad ateroscler&oacute;tica. Se han utilizado anticoagulantes orales y antiagregantes plaquetarios con la finalidad de disminuir el riesgo de oclusi&oacute;n tromb&oacute;tica en este grupo de pacientes, sobre todo en aqu&eacute;llos en quienes existen otros factores de riesgo como la presencia de anticuerpos antifosfol&iacute;pidos.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Hipertensi&oacute;n arterial pulmonar</b></font></p>     <p align="justify"><font face="verdana" size="2">Descrita como una manifestaci&oacute;n poco frecuente (1%), la hipertensi&oacute;n arterial pulmonar (HAP) puede ser el resultado tanto de enfermedades pulmonares intr&iacute;nsecas como de afecci&oacute;n vascular pura. En la evaluaci&oacute;n <i>post&#150;mortem </i>es com&uacute;n encontrar enfermedad oclusiva, aunque la arteritis es un hallazgo poco frecuente.<sup>74</sup> La presentaci&oacute;n cl&iacute;nica incluye disnea de medianos a peque&ntilde;os esfuerzos, tos no productiva, fatiga y palpitaciones en ausencia de otras manifestaciones que sugieran actividad del LEG. Hasta un 60% de los pacientes con HAP y LEG tienen fen&oacute;meno de Raynaud. En la exploraci&oacute;n f&iacute;sica se encuentra reforzamiento del componente pulmonar del segundo ruido card&iacute;aco, fr&eacute;mito para&#150;esternal a nivel del segundo espacio intercostal izquierdo, edema perif&eacute;rico, ascitis e incremento de la presi&oacute;n venosa yugular. La radiograf&iacute;a de t&oacute;rax puede demostrar cardiomegalia con prominencia del cono de la arteria pulmonar y oligohemia perif&eacute;rica. El electrocardiograma demuestra signos de hipertrofia y sobrecarga ventricular derecha. En pacientes con LEG y s&iacute;ndrome de anticuerpos antifosfol&iacute;pidos, el desarrollo de eventos tromboemb&oacute;licos de repetici&oacute;n y la activaci&oacute;n del endotelio por anticuerpos puede llevar a HAP.<sup>75</sup></font></p>     <p align="justify"><font face="verdana" size="2">La ciclofosfamida administrada en bolos intravenosos mensuales disminuye la presi&oacute;n sist&oacute;lica de la arteria pulmonar y mejora la funcionalidad de los pacientes con HAP secundaria a LEG.<sup>76,77</sup> Es promisorio el efecto de nuevos f&aacute;rmacos como los inhibidores de endotelina&#150;1 (bosent&aacute;n),<sup>78</sup> los an&aacute;logos sint&eacute;ticos de prostaglandinas (iloprost)<sup>79</sup> y los inhibidores de fosfodiesterasas (sildenafil)<sup>80</sup> para el tratamiento de la HAP, tanto en su variedad primaria como en la asociada a enfermedades reum&aacute;ticas.</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>     <p align="justify"><font face="verdana" size="2">Como prototipo de enfermedad autoinmune generalizada, el LEG puede producir da&ntilde;o a cualquier nivel del sistema cardiovascular. Sin embargo, el espectro de afecci&oacute;n ha ido evolucionando conforme se han refinado las t&eacute;cnicas de diagn&oacute;stico e incrementado el arsenal terap&eacute;utico.</font></p>     <p align="justify"><font face="verdana" size="2">Un adecuado conocimiento del perfil de afecci&oacute;n que ocurre actualmente en LEG es indispensable para procurar una atenci&oacute;n precoz y acertada en pacientes portadores de esta enfermedad.</font></p>     ]]></body>
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