<?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>0034-7523</journal-id>
<journal-title><![CDATA[Revista Cubana de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[Rev cubana med]]></abbrev-journal-title>
<issn>0034-7523</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75232011000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Miocarditis viral en el adulto]]></article-title>
<article-title xml:lang="en"><![CDATA[Viral myocarditis in the adult]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Limonta Velázquez]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Batista Cuéllar]]></surname>
<given-names><![CDATA[Juan F]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Riaño Arencibia]]></surname>
<given-names><![CDATA[Miguel A]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abdo Cuza]]></surname>
<given-names><![CDATA[Anselmo]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto de Medicina Tropical Pedro Kourí (IPK)  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Centro de Investigaciones Clínicas (CIC)  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Facultad de Medicina Miguel Enríquez  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Centro de Investigaciones Médico Quirúrgicas  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2011</year>
</pub-date>
<volume>50</volume>
<numero>1</numero>
<fpage>70</fpage>
<lpage>82</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75232011000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75232011000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75232011000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La miocarditis viral es resultado de una inflamación del miocardio provocada por diferentes virus. Esta enfermedad cardíaca constituye sin duda una urgencia cardiovascular en el adulto por las complicaciones que ocasiona. El cuadro clínico se caracteriza por arritmias e insuficiencia cardíaca que pueden conducir a la muerte. La secuela más frecuente de la miocarditis viral a largo plazo es la miocardiopatía dilatada. En el presente trabajo se revisa etiología, fisiopatología, sintomatología, diagnóstico y tratamiento de la miocarditis viral en el adulto.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Viral myocarditis is the result of a myocardial inflammation provoked by different viruses. This cardiac disease is doubtless a cardiovascular urgency in the adult due to its complications. The clinical picture is characterized by arrhythmias and cardiac failure that may to lead to death. The more frequent long-term myocarditis sequela is the dilated myocardiopathy. In present paper etiology, pathophysiology, symptomatology, diagnosis and treatment of viral myocarditis in the adult are reviewed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Miocarditis]]></kwd>
<kwd lng="es"><![CDATA[virus]]></kwd>
<kwd lng="es"><![CDATA[insuficiencia cardíaca]]></kwd>
<kwd lng="es"><![CDATA[arritmias]]></kwd>
<kwd lng="es"><![CDATA[choque cardiogénico]]></kwd>
<kwd lng="es"><![CDATA[biopsia endomiocárdica]]></kwd>
<kwd lng="es"><![CDATA[miocardiopatía dilatada]]></kwd>
<kwd lng="en"><![CDATA[Myocarditis]]></kwd>
<kwd lng="en"><![CDATA[virus]]></kwd>
<kwd lng="en"><![CDATA[cardiac failure]]></kwd>
<kwd lng="en"><![CDATA[arrhythmias]]></kwd>
<kwd lng="en"><![CDATA[cardiogenic shock]]></kwd>
<kwd lng="en"><![CDATA[endomyocardial biopsy]]></kwd>
<kwd lng="en"><![CDATA[dilated myocardiopathy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="right">       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <B>TEMAS ACTUALIZADOS      </B></font></p>       <p>&nbsp;</p>       <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b>Miocarditis      viral en el adulto</b></font></p>       <p align="left">&nbsp;</p>       <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>Viral      myocarditis in the adult </b></font></p>       <p align="left">&nbsp;</p>       <p align="left">&nbsp;</p>       <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Daniel      Limonta Vel&aacute;zquez,<SUP>I</SUP> Juan F. Batista Cu&eacute;llar,<SUP>II</SUP>      Miguel A. Ria&ntilde;o Arencibia,<SUP>III</SUP> Anselmo Abdo Cuza<SUP>IV</SUP></b></font></p> </div> <B></B>      <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><SUP>I</SUP> M&aacute;ster    en Virolog&iacute;a. Especialista de I Grado en Medicina General Integral. Especialista    de I Grado en Microbiolog&iacute;a M&eacute;dica. Instructor. Instituto de Medicina    Tropical &quot;Pedro Kour&iacute;&quot; (IPK). La Habana, Cuba. </font>    <br>   <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><SUP>II </SUP>Especialista    de I Grado en Medicina Interna. Especialista de II Grado en Cardiolog&iacute;a.    Asistente. Centro de Investigaciones Cl&iacute;nicas (CIC). La Habana, Cuba.        <br>   <SUP>III </SUP>Especialista de II Grado en Caumatolog&iacute;a. Verticalizado    en Medicina Intensiva y Emergencias. Profesor Auxiliar. Facultad de Medicina    &quot;Miguel Enr&iacute;quez&quot;. La Habana, Cuba.    <br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><SUP>IV</SUP>    Doctor en Ciencias M&eacute;dicas. Especialista de I<SUP> </SUP>Grado en Medicina    Interna. Especialista de II Grado en Medicina Intensiva y Emergencias. Profesor    Titular. Centro de Investigaciones M&eacute;dico Quir&uacute;rgicas. La Habana,    Cuba. </font>      <P>     <P> <hr size="1" noshade>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>RESUMEN</B>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La miocarditis    viral es resultado de una inflamaci&oacute;n del miocardio provocada por diferentes    virus. Esta enfermedad card&iacute;aca constituye sin duda una urgencia cardiovascular    en el adulto por las complicaciones que ocasiona. El cuadro cl&iacute;nico se    caracteriza por arritmias e insuficiencia card&iacute;aca que pueden conducir    a la muerte. La secuela m&aacute;s frecuente de la miocarditis viral a largo    plazo es la miocardiopat&iacute;a dilatada. En el presente trabajo se revisa    etiolog&iacute;a, fisiopatolog&iacute;a, sintomatolog&iacute;a, diagn&oacute;stico    y tratamiento de la miocarditis viral en el adulto. </font>     <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Palabras clave:</B>    Miocarditis, virus, insuficiencia card&iacute;aca, arritmias, choque cardiog&eacute;nico,    biopsia endomioc&aacute;rdica, miocardiopat&iacute;a dilatada. </font> <hr size="1" noshade>     <P>      <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>ABSTRACT</B>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Viral myocarditis    is the result of a myocardial inflammation provoked by different viruses. This    cardiac disease is doubtless a cardiovascular urgency in the adult due to its    complications. The clinical picture is characterized by arrhythmias and cardiac    failure that may to lead to death. The more frequent long-term myocarditis sequela    is the dilated myocardiopathy. In present paper etiology, pathophysiology, symptomatology,    diagnosis and treatment of viral myocarditis in the adult are reviewed. </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Key words</B>:    Myocarditis, virus, cardiac failure, arrhythmias, cardiogenic shock, endomyocardial    biopsy, dilated myocardiopathy. </font> <hr size="1" noshade>     <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B><font size="3">INTRODUCCI&Oacute;N</font></B>    </font></p>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las infecciones    virales constituyen sin duda la causa m&aacute;s frecuente de miocarditis. La    miocarditis viral se puede presentar en cualquier paciente con abundantes s&iacute;ntomas,    desde episodios ligeros de disnea y dolor tor&aacute;cico que desaparecen sin    terapia espec&iacute;fica hasta el potencialmente fatal choque cardiog&eacute;nico.    En el adulto se puede encontrar la secuela a largo plazo m&aacute;s frecuente    de la miocarditis viral que es la miocardiopat&iacute;a dilatada con insuficiencia    card&iacute;aca cr&oacute;nica.<SUP>1</SUP> En este trabajo se presenta una    revisi&oacute;n actualizada y pr&aacute;ctica de la miocarditis viral en el    adulto. </font>      <P>      <P>      <P> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Epidemiolog&iacute;a</B></font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En la actualidad    la verdadera incidencia de la miocarditis viral es desconocida y posiblemente    exista un subregistro de la enfermedad porque, usualmente, no se realiza la    biopsia endomioc&aacute;rdica para confirmarla. Adem&aacute;s, los datos de    la respuesta de anticuerpos en la poblaci&oacute;n contra los enterovirus asociados    com&uacute;nmente a las miocarditis son dif&iacute;ciles de interpretar a causa    de la reacci&oacute;n cruzada que habitualmente ocurre entre ellos.<SUP>1</SUP>    </font>      <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los informes de    necropsia, de acuerdo con las diferentes poblaciones estudiadas, muestran incidencias    variables de miocarditis con un rango de 0,12 a 12 %. Las miocarditis se observan    con m&aacute;s frecuencia en la infancia y despu&eacute;s en la adultez, se    presenta, sobre todo entre los 20 y 54 a&ntilde;os.<SUP>2,3</SUP> En uno de    estos estudios de autopsias realizado en Finlandia,<SUP>3</SUP> la miocarditis    se present&oacute; fundamentalmente en ni&ntilde;os y comenzaba a disminuir    de forma importante despu&eacute;s de los 54 a&ntilde;os (con una proporci&oacute;n    de 6,38 a 1,12 en 1 000 muertes). Despu&eacute;s de los 55 a&ntilde;os y hasta    mayores de 75, la proporci&oacute;n diminuy&oacute; de 0,39 a 0,11 en 1 000    muertes.<SUP>3</SUP> </font>      <P>      ]]></body>
<body><![CDATA[<P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Etiolog&iacute;a    </B> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las infecciones    por virus cardiotr&oacute;picos se mantienen como la causa principal de miocarditis    en pa&iacute;ses en desarrollo.<SUP>1</SUP> Sin embargo, la miocarditis puede    ser provocada por otras causas infecciosas (bacterianas, f&uacute;ngicas y parasitarias),    enfermedades autoinmunes, hipersensibilidad a medicamentos, reacciones t&oacute;xicas,    c&aacute;ncer, sarcoidosis, miocarditis eosinof&iacute;lica y miocarditis de    c&eacute;lulas gigantes.<SUP>4</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las miocarditis    virales son causadas principalmente por virus coxsackie B (pertenecientes a    la familia de los enterovirus), adenovirus y parvovirus B19.<SUP>1,5,6</SUP>    Sin embargo, se han reportado miocarditis de origen viral por virus de la inmunodeficiencia    humana 1 (VIH-1),<SUP>7,8</SUP> virus de la influenza A y B<SUP>9</SUP>, rotavirus<SUP>10</SUP>    y virus herpes humano como el citomegalovirus,<SUP>5,11</SUP> virus de Epstein-Barr<SUP>5</SUP>    y el virus herpes 6.<SUP>5,11,12</SUP> En un trabajo reciente se han descrito    miocarditis causadas por coinfecciones de estos virus.<SUP>6</SUP> Tambi&eacute;n    se ha documentado miocarditis por virus de la hepatitis C<SUP>13,14</SUP> y    arbovirus o virus trasmitidos por artr&oacute;podos como el virus dengue<SUP>15</SUP>    y el chikungunya.<SUP>16</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><I>To KKW</I> y    otros, en una muy reciente investigaci&oacute;n en Hong Kong, demostraron que    5 de 23 casos adultos fallecidos por el virus pand&eacute;mico de influenza    A H1N1 del a&ntilde;o 2009 presentaban evidencias ecocardiogr&aacute;ficas de    miocarditis (3 casos confirmados <I>post mortem</I> con miocarditis linfoc&iacute;tica)    y que adem&aacute;s eran estos 23 individuos los de edad m&aacute;s avanzada.<SUP>17</SUP>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En nuestro pa&iacute;s    existen escasos reportes de miocarditis viral y solo en ni&ntilde;os hay reportes    de miocarditis causada por virus dengue serotipo 2 en una epidemia de dengue    del a&ntilde;o 1981<SUP>18</SUP> y por adenovirus en un brote epid&eacute;mico    durante el a&ntilde;o 2005.<SUP>19,20</SUP> </font>      ]]></body>
<body><![CDATA[<P>      <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Fisiopatolog&iacute;a</B>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Aunque la fisiopatolog&iacute;a    de la miocarditis viral ha sido ampliamente estudiada en modelos experimentales    en ratones y de forma limitada en tejido mioc&aacute;rdico humano, se conoce    que la reacci&oacute;n inflamatoria en la miocarditis de etiolog&iacute;a viral    se debe al da&ntilde;o directo causado por los virus o la respuesta inmune antiviral    y se encuentra relacionada con la susceptibilidad gen&eacute;tica del hospedero.<SUP>1</SUP>    </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente se    conoce que los virus cardiotr&oacute;picos por excelencia como los virus coxsackie    B y adenovirus 2 y 5 comparten los mismos receptores sobre c&eacute;lulas mioc&aacute;rdicas    llamados CAR (del ingl&eacute;s, <I>coxsackie-adenovirus receptor</I>).<SUP>21</SUP>    Estudios experimentales han demostrado que la expresi&oacute;n de los CAR es    m&aacute;s alta en las primeras etapas de la vida y que luego disminuye en el    curso de la vida adulta. Estos hallazgos podr&iacute;an explicar la susceptibilidad    en la edad pedi&aacute;trica a las miocarditis virales.<SUP>22 </SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El da&ntilde;o    directo al miocardio mediado por la invasi&oacute;n viral se ha demostrado por    una proteasa que es codificada por el virus coxsackie B3 llamada proteasa 2    A que tiene efecto proteol&iacute;tico sobre la distrofina (prote&iacute;na    que se une a la actina).<SUP>23</SUP> Adem&aacute;s, la proteasa 2A y la proteasa    3C de los virus coxsackie B3 pueden inducir apoptosis de los miocitos.<SUP>24</SUP>    </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Por otro lado se    ha demostrado, de forma experimental, que los virus coxsackie B3 comparten determinantes    antig&eacute;nicos con la miosina y este mimetismo molecular induce autoanticuerpos    antimiosina y un mecanismo autoinmune de destrucci&oacute;n del tejido mioc&aacute;rdico.    Adicionalmente, estos mismos autoanticuerpos antimiosina presentan reacci&oacute;n    cruzada con los receptores<font face="Symbol"> b</font>1 adren&eacute;rgicos    situados sobre los miocitos induci&eacute;ndolos a morir por apoptosis.<SUP>25</SUP>    </font>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La interrelaci&oacute;n    que existe entre la respuesta inmune antiviral de tipo innata y la adquirida    desempe&ntilde;a un papel fundamental en el desenlace de la infecci&oacute;n    por virus del tejido mioc&aacute;rdico. Estudios en modelos animales indican    que mecanismos efectores de la respuesta innata como el TNF, oxido n&iacute;trico,    activaci&oacute;n del complemento y receptores tipo<I> toll</I> (que reconocen    patrones moleculares asociados a microorganismos pat&oacute;genos) podr&iacute;an    estar involucrados en la inducci&oacute;n del da&ntilde;o mioc&aacute;rdico.<SUP>26</SUP>    </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El infiltrado inflamatorio    con abundante presencia de c&eacute;lulas mononucleares, a predominio de linfocitos,    en las lesiones de miocarditis de etiolog&iacute;a viral, pone de manifiesto    la amplia participaci&oacute;n de la respuesta inmune mediada por c&eacute;lulas.    Se ha demostrado que la liberaci&oacute;n de ciertas citocinas proinflamatorias    por las c&eacute;lulas T ayudantes (Th1 y Th2) y la m&aacute;s recientemente    descrita interleucina 17 producida por las c&eacute;lulas T tipo 17 (Th17) incrementan    la severidad de la miocarditis en modelos animales.<SUP>21</SUP> </font>     ]]></body>
<body><![CDATA[<P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Entre los factores    del hospedero posiblemente relacionados con la infecci&oacute;n viral del miocardio    se han postulado haplotipos del complejo mayor de histocompatilibilidad como    el locus HLA-DQ<SUP>27</SUP> y polimorfismos gen&eacute;ticos del CD45 (participa    en el funcionamiento de los linfocitos).<SUP>28</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se necesita mayor    comprensi&oacute;n de los mecanismos fisiopatol&oacute;gicos de la miocarditis    que puedan explicar por qu&eacute; la mayor&iacute;a de las infecciones por    virus cardiotr&oacute;picos no resultan cl&iacute;nicamente en inflamaci&oacute;n    del miocardio y, sin embargo, en una minor&iacute;a de los casos resulta en    da&ntilde;o mioc&aacute;rdico persistente de origen inmunol&oacute;gico.<SUP>1</SUP>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Manifestaciones    cl&iacute;nicas</B> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La miocarditis    viral, desde el punto de vista de la evoluci&oacute;n cl&iacute;nica, puede    desarrollarse en 3 estadios: agudo, sub-agudo y cr&oacute;nico. El paso de un    estadio a otro no siempre es evidente o puede presentarse la enfermedad inicialmente    en una etapa sub-aguda o cr&oacute;nica.<SUP>29-31</SUP> En la historia natural    de la enfermedad (<U><a href="#f1">fig.</a></U>), las 3 etapas pueden ser evolutivas,    terminar con la curaci&oacute;n del paciente, con una secuela o con la muerte,    seg&uacute;n la susceptibilidad inmunol&oacute;gica individual, la virulencia    del agente viral y el estado de salud previo del paciente.<SUP>29,30</SUP> </font>      <P align="center"><a name="f1"></a><img src="/img/revistas/med/v50n1/f0107111.gif" width="430" height="296">      
<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En la pr&aacute;ctica    cl&iacute;nica, la enfermedad puede ser inicialmente asintom&aacute;tica y evolucionar    solapadamente hacia la miocardiopat&iacute;a dilatada o comenzar con s&iacute;ntomas    no espec&iacute;ficos, entre los cuales son frecuentes la astenia, fiebre y    dolor far&iacute;ngeo con s&iacute;ntomas de infecci&oacute;n viral del tracto    respiratorio superior o gastrointestinal en los d&iacute;as previos. Tambi&eacute;n    se puede observar una taquicardia no explicable, molestia precordial por compromiso    peric&aacute;rdico o s&iacute;ntomas m&aacute;s relevantes como s&iacute;ncope,    disnea severa, arritmias supraventriculares y trastornos de conducci&oacute;n,    insuficiencia card&iacute;aca e inestabilidad hemodin&aacute;mica.<SUP>4</SUP><FONT  COLOR="#ff0000"> </FONT></font>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En ocasiones, el    dolor precordial en el curso de la miocarditis puede simular una angina t&iacute;pica    con cambios electrocardiogr&aacute;ficos que incluyen la elevaci&oacute;n del    segmento S-T y otros cambios sugestivos del infarto del miocardio, no obstante,    los estudios angiogr&aacute;ficos muestran coronarias normales.<SUP>32</SUP>    Adicionalmente, de forma m&aacute;s infrecuente, el dolor tor&aacute;cico puede    asociarse a vasospasmo de las arterias coronarias como reportaron <I>McCully    RB</I> y otros.<SUP>33</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">No es poco com&uacute;n    que en los casos de inicio agudo con predominio de s&iacute;ntomas y signos    de la afecci&oacute;n mioc&aacute;rdica, el examen f&iacute;sico revele soplos    de insuficiencia valvular mitral o tricusp&iacute;dea, tercer ruido y ritmo    de galope ventricular.<SUP>1</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los casos con cuadro    fulminante pueden presentarse con insuficiencia card&iacute;aca severa, choque    cardiog&eacute;nico, embolismos pulmonares por trombos murales en cavidades    card&iacute;acas derechas y muerte s&uacute;bita. No obstante, la presentaci&oacute;n    benigna es la forma evolutiva m&aacute;s frecuente de la miocarditis aguda de    etiolog&iacute;a viral.<SUP>1</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Es as&iacute; que    por el amplio espectro de presentaciones cl&iacute;nicas de la miocarditis viral    aguda los m&eacute;dicos deben considerar una amplia gama de s&iacute;ndromes    del aparato cardiovascular, que pueden ser de causa infecciosa o no, en el diagn&oacute;stico    diferencial. </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Diagn&oacute;stico    </B> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La evaluaci&oacute;n    inicial de una miocarditis viral incluye una detallada historia de la enfermedad,    un cuidadoso examen cardiovascular y general, y ex&aacute;menes complementarios    en busca de aclarar la posible causa viral. Los ex&aacute;menes complementarios    deben incluir anal&iacute;tica hem&aacute;tica, electrocardiograma, radiograf&iacute;a    de t&oacute;rax, otras t&eacute;cnicas imaginol&oacute;gicas no invasivas y    la biopsia endomiocard&iacute;aca.<SUP>21</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Algunos ex&aacute;menes    complementarios no espec&iacute;ficos podr&iacute;an mostrar eritrosedimentaci&oacute;n    acelerada con incremento de leucocitos sangu&iacute;neos y prote&iacute;na C    reactiva. Los marcadores de da&ntilde;o mioc&aacute;rdico, troponina I y T,    pueden ser &uacute;tiles para confirmar el diagn&oacute;stico de miocarditis    si se encuentran aumentados en el suero.<SUP>34-36</SUP> Estos marcadores suelen    estar m&aacute;s incrementados que la fosfocinasa de creatina y la fosfocinasa    de creatina isoenzima MB.<SUP>35,36</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las pruebas de    detecci&oacute;n de anticuerpos antivirales y de aislamiento viral en el suero    u otra muestra cl&iacute;nica para determinar la infecci&oacute;n por diferentes    virus cardiotr&oacute;picos podr&iacute;an apoyar los hallazgos cl&iacute;nicos,    de laboratorio e imaginol&oacute;gicos y contribuir as&iacute; a un diagn&oacute;stico    presuntivo de esta entidad si no se realiza una biopsia endomioc&aacute;rdica.    Sin embargo, estas pruebas pueden ayudar a determinar la causa en los pacientes    con sospecha de miocarditis que no se sometan al procedimiento de la biopsia    endomioc&aacute;rdica.<SUP>1</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">A pesar de su amplio    uso, la sensibilidad del electrocardiograma en el diagn&oacute;stico de la miocarditis    es s&oacute;lo de 47 %.<SUP>37</SUP> En la miocarditis, el electrocardiograma    puede mostrar taquicardia sinusal y anormalidades no espec&iacute;ficas del    segmento ST y de la onda T, pero tambi&eacute;n pueden observarse cambios sugestivos    de lesi&oacute;n mioc&aacute;rdica como infradesnivel o supradesnivel de ST    y onda Q patol&oacute;gica.<SUP>32,33</SUP> Adicionalmente, pueden ser encontrados    signos agudos de participaci&oacute;n peric&aacute;rdica. La observaci&oacute;n    de bloqueo completo de rama izquierda o la aparici&oacute;n de ondas Q se ha    asociado con altas tasas de mortalidad.<SUP>38,39</SUP> </font>      <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Independientemente    de que no existen patrones ecocardiogr&aacute;ficos patognom&oacute;nicos en    la miocarditis, han sido bien documentados en casos histopatol&oacute;gicamente    probados de esta entidad hallazgos como: dilataci&oacute;n, hipertrofia, miocardiopat&iacute;a    restrictiva y miocardiopat&iacute;a isqu&eacute;mica, as&iacute; como trastornos    regionales del movimiento de paredes ventriculares como los observados en el    infarto del miocardio.<SUP>40</SUP> El ecocardiograma puede servir para diferenciar    entre la miocarditis subaguda y la fulminante porque la fulminante se presenta    con cavidad card&iacute;aca izquierda m&aacute;s peque&ntilde;a y paredes engrosadas.<SUP>41</SUP>    La disfunci&oacute;n severa del ventr&iacute;culo derecho ha sido reportada    como el indicador m&aacute;s robusto de mortalidad o necesidad de trasplante    card&iacute;aco.<SUP>42</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La resonancia magn&eacute;tica    cardiovascular ha emergido como la herramienta imaginol&oacute;gica m&aacute;s    importante en el procedimiento diagn&oacute;stico de la miocarditis. Tal es    as&iacute; que la resonancia magn&eacute;tica cardiovascular contrastada T1-T2,    est&aacute; siendo cada vez m&aacute;s utilizada no s&oacute;lo para detectar    im&aacute;genes sugestivas de miocarditis, sino tambi&eacute;n para se&ntilde;alar    las zonas adecuadas para tomar muestras de biopsias endomioc&aacute;rdicas con    alta sensibilidad y especificidad.<SUP>43-45</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los estudios de    Medicina Nuclear tambi&eacute;n han hecho aportes al diagn&oacute;stico y seguimiento    de la enfermedad. Dos tipos de estudios se reportan como los m&aacute;s &uacute;tiles    para detectar focos de miocarditis: la gammagraf&iacute;a con Galio 67 y la    gammagraf&iacute;a con anticuerpos monoclonales antimiosina marcados con Indium    111.<SUP>46,47</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Luego del surgimiento    de la biopsia endomioc&aacute;rdica, los criterios histopatol&oacute;gicos utilizados    en su interpretaci&oacute;n presentaban dificultades por lo cual en la d&eacute;cada    de los 80 se realiz&oacute; una convenci&oacute;n de pat&oacute;logos, en la    ciudad de Dallas de los Estados Unidos, que establecieron los criterios que    llevan el nombre de dicha ciudad. Los criterios histopatol&oacute;gicos de Dallas    describen la miocarditis como un infiltrado celular inflamatorio asociado o    no a necrosis de los miocitos en cortes de tejido mioc&aacute;rdico con t&eacute;cnicas    de tinci&oacute;n convencionales.<SUP>48</SUP> </font>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los criterios de    Dallas presentan limitaciones y han sido cuestionados por la interpretaci&oacute;n    individual, baja sensibilidad y poco valor pron&oacute;stico.<SUP>49</SUP> Estas    limitaciones han estimulado la aparici&oacute;n de otras clasificaciones inmunohistol&oacute;gicas    que indican inflamaci&oacute;n mioc&aacute;rdica, basadas en el marcaje por    inmunohistoqu&iacute;mica de ant&iacute;genos como el CD3, CD4, CD20, CD68 y    HLA que incrementan la sensibilidad, tienen valor pron&oacute;stico y se pueden    utilizar en conjunto con los criterios de Dallas.<SUP>50</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En fecha reciente,    el Colegio Americano de Cardiolog&iacute;a, la Asociaci&oacute;n Americana del    Coraz&oacute;n y la Sociedad Europea de Cardiolog&iacute;a emitieron un documento    que indica la realizaci&oacute;n de la biopsia endomioc&aacute;rdica, principalmente    frente a la sospecha de 2 entidades: la miocarditis fulminante de causa indeterminada    y frente a un cuadro agudo compatible con miocarditis de c&eacute;lulas gigantes.<SUP>51</SUP>    A los pacientes con alto &iacute;ndice de sospecha de estos 2 cuadros de miocarditis    se les debe realizar la biopsia endomioc&aacute;rdica en centros especializados    y por personal experimentado, porque aunque infrecuente, puede ocurrir una variedad    de complicaciones cardiovasculares e incluso la muerte.<SUP>21</SUP> </font>      <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La biopsia endomioc&aacute;rdica    no s&oacute;lo es necesaria para aplicar los criterios de Dallas, sino tambi&eacute;n    para realizar t&eacute;cnicas de biolog&iacute;a molecular como el PCR con el    objetivo de detectar los &aacute;cidos nucleicos (ADN o ARN) de diferentes virus    y determinar los marcadores inmunohistol&oacute;gicos. El PCR puede demostrar    el genoma de un gran n&uacute;mero de virus en el tejido mioc&aacute;rdico con    alta sensibilidad, especificidad y rapidez.<SUP>1</SUP> </font>     <P>      <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Tratamiento    </B> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En la actualidad,    el tratamiento de la miocarditis viral comprende 3 aspectos fundamentales: medidas    generales, tratamiento de las complicaciones y tratamiento espec&iacute;fico    antiviral. </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las medidas generales    incluyen la restricci&oacute;n de deportes o ejercicios de gran intensidad por    lo menos durante 6 meses o m&aacute;s de la convalescencia, en dependencia de    la afectaci&oacute;n de la funci&oacute;n ventricular izquierda.<SUP>52</SUP>    </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">A los casos con    miocarditis que se presentan con miocardiopat&iacute;a dilatada e insuficiencia    card&iacute;aca se les impone la terap&eacute;utica est&aacute;ndar de este    tipo de insuficiencia que se recoge en las gu&iacute;as actuales del Colegio    Americano de Cardiolog&iacute;a, la Asociaci&oacute;n Americana del Coraz&oacute;n    y la Sociedad Europea de Cardiolog&iacute;a. Este tratamiento incluye diur&eacute;ticos,    inhibidores de la enzima convertidora de la angiotensina, o antagonistas de    receptores de la angiotensina, as&iacute; como betabloqueadores como el metoprolol,    bisopropol y carvedilol cuando el paciente est&eacute; cl&iacute;nicamente estable.<SUP>53,54</SUP>    </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En cambio, si el    paciente empeora y evoluciona hacia el choque cardiog&eacute;nico se ha postulado    el uso del apoyo circulatorio mec&aacute;nico a trav&eacute;s de dispositivos    de asistencia ventricular y la oxigenaci&oacute;n extracorporal de membrana    con el objetivo de recuperar al paciente o estabilizarlo para un posible trasplante    card&iacute;aco.<SUP>55-58</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Adicionalmente,    si los pacientes presentan signos de insuficiencia card&iacute;aca severa o    choque cardiog&eacute;nico se pueden utilizar medicamentos inotr&oacute;picos    endovenosos.<SUP>53,54</SUP> El uso de la digoxina en la insuficiencia card&iacute;aca    por miocarditis de causa viral debe ser con dosis bajas, teniendo en cuenta    que en un modelo murino de miocarditis viral tratado con este medicamento se    demostr&oacute; un aumento de las citocinas proinflamatorias en el tejido mioc&aacute;rdico    y de la mortalidad de los animales.<SUP>59</SUP> </font>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Seg&uacute;n las    gu&iacute;as de las sociedades internacionales de cardiolog&iacute;a m&aacute;s    importantes mencionadas anteriormente, las arritmias en las miocarditis se deben    tratar de forma convencional porque estos trastornos usualmente desaparecen    despu&eacute;s de la fase aguda de la enfermedad, que dura varias semanas. Sin    embargo, los bloqueos atrioventriculares y las taquiarritmias deben ser tratados    con los medicamentos habituales y marcapasos temporales o permanentes. Por otro    lado, si las arritmias persisten pasada la fase aguda de la miocarditis en forma    de taquicardia ventricular sostenida o sintom&aacute;tica se puede administrar    terapia antiarr&iacute;tmica como la amiodarona, colocar un cardiorrevertidor-desfibrilador    implantable o valorar un trasplante card&iacute;aco.<SUP>60</SUP> </font>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El uso de antiinflamatorios    no esteroideos no est&aacute; recomendado y debe ser evitado porque estos medicamentos    en estudios de ratones con miocarditis por virus coxsackie B incrementaron la    inflamaci&oacute;n del miocardio y la mortalidad.<SUP>61,62</SUP> </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">A pesar de los    posibles efectos inmunomoduladores y antivirales de la inmunoglobulina endovenosa,    no se recomienda su uso de rutina en el tratamiento de la miocarditis viral.    En un ensayo cl&iacute;nico de modulaci&oacute;n inmune de la miocardiopat&iacute;a    aguda no se demostr&oacute; mejor&iacute;a de los pacientes adultos con miocarditis    o miocardiopat&iacute;a dilatada tratados con inmunoglobulina endovenosa cuando    fueron comparados con el grupo placebo.<SUP>63</SUP> </font>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El hallazgo frecuente    de virus en la miocarditis aguda hace pensar en la posibilidad del tratamiento    antiviral y profilaxis con vacunas. Sin embargo, la informaci&oacute;n sobre    una adecuada efectividad del tratamiento antiviral en las miocarditis se limita    a estudios en ratones.<SUP>64,65</SUP> Hasta el momento, s&oacute;lo existe    una peque&ntilde;a serie de 3 casos de un ensayo terap&eacute;utico con el antiviral    ribavirina endovenoso en seres humanos con miocarditis fulminante por virus    influenza y no se demostr&oacute; efectividad alguna.<SUP>66</SUP> Estos resultados    no son inesperados teniendo en cuenta que la mayor&iacute;a de las miocarditis    virales son diagnosticadas varias semanas despu&eacute;s de la infecci&oacute;n    viral aguda cuando el tratamiento antiviral es ya tard&iacute;o.<SUP>21</SUP>    </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B><font size="3">REFERENCIAS    BIBLIOGR&Aacute;FICAS </font></B> </font>     <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1. Dennert R, Crijns    HJ, Heymans S. Acute viral myocarditis. Eur Heart J. 2008;(17): 2073-82. </font>    <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2. Wakafuji S,    Okada R. Twenty year autopsy statistics of myocarditis incidence in Japan. Jpn    Circ J. 1986;50(12):1288-93. </font>    <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3. Kyto V, Saraste    A, Voipio-Pulkki LM, Saukko P. Incidence of fatal myocarditis: a population-based    study in Finland. Am J Epidemiol. 2007;165(5):570-4. </font>    <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">4. Cooper LT, Jr.    Myocarditis. N Engl J Med. 2009;360(15):1526-38. </font>     ]]></body>
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J Infect Dis. 1989;159(5):829-36.    </font>    <P>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Recibido: 4 de    mayo de 2010.     <br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Aprobado:    18 de mayo de 2010. </font>     <P>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Dr. <I>Daniel Limonta    Vel&aacute;zquez.</I> Instituto de Medicina Tropical &quot;Pedro Kour&iacute;&quot;    (IPK), Autopista Novia del Mediodia km 6 1/2, La Lisa. La Habana, Cuba. Correo    electr&oacute;nico:<a href="mailto:dlimonta@infomed.sld.cu"> <U><FONT  COLOR="#0000ff">dlimonta@infomed.sld.cu</FONT></U> </a></font>       ]]></body><back>
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