<?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>S1405-99402007000300001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Entendiendo la hipertrofia ventricular izquierda]]></article-title>
<article-title xml:lang="en"><![CDATA[Understanding left ventricular hypertrophy]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guadalajara Boo]]></surname>
<given-names><![CDATA[José Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez  ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<volume>77</volume>
<numero>3</numero>
<fpage>175</fpage>
<lpage>180</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402007000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402007000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402007000300001&amp;lng=en&amp;nrm=iso"></self-uri><kwd-group>
<kwd lng="es"><![CDATA[Hipertrofia adecuada]]></kwd>
<kwd lng="es"><![CDATA[Hipertrofia inadecuada]]></kwd>
<kwd lng="es"><![CDATA[Hipertrofia patológica]]></kwd>
<kwd lng="en"><![CDATA[Adequate hypertrophy]]></kwd>
<kwd lng="en"><![CDATA[Inadequate hypertrophy]]></kwd>
<kwd lng="en"><![CDATA[Pathologic hypertrophy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Editorial</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Entendiendo la hipertrofia ventricular izquierda</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Understanding left ventricular hypertrophy</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Jos&eacute; Fernando Guadalajara Boo*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Editor en Jefe Archivos de Cardiolog&iacute;a de M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>      <i>    <br>     Dr. Jos&eacute; Fernando Guadalajara Boo.          <br>     Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez          <br>     (INCICH, Juan Badiano N&uacute;m. 1. Col. Secci&oacute;n XVI, Tlalpan          <br>     14080, M&eacute;xico, D.F.).          <br>   Tel. 56 55 29 24. Fax. 55 73 09 94. </i> <b>    <br> E-mail:</b> <a href="mailto:guadalajara@cardiologia.org.mx">guadalajara@cardiologia.org.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido: 20 de junio de 2007     <br> Aceptado: 22 de junio de 2007</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>Palabras clave: </b>Hipertrofia adecuada. Hipertrofia inadecuada. Hipertrofia patol&oacute;gica. <b>    <br> Key words: </b>Adequate hypertrophy. Inadequate hypertrophy. Pathologic hypertrophy.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Se ha demostrado en forma fehaciente que la hipertrofia ventricular izquierda, representa un importante factor de riesgo de mortalidad en la poblaci&oacute;n general,<sup>1-5</sup> en hipertensi&oacute;n arterial<sup>6,7</sup> en la estenosis a&oacute;rtica grave;<sup>8</sup> en la insuficiencia card&iacute;aca,<sup>9</sup> y en aquellos pacientes afectados por cardiopat&iacute;a isqu&eacute;mica,<sup>10,11</sup> lo cual contrasta, con la hipertrofia fisiol&oacute;gica que determina el crecimiento del coraz&oacute;n durante el desarrollo del ser humano, la hipertrofia que acompa&ntilde;a el embarazo y al coraz&oacute;n del atleta, la cual no tiene consecuencias patol&oacute;gicas.<sup>13-15</sup> Es por ello que Escudero y Pinilla llaman la atenci&oacute;n sobre este hecho en el art&iacute;culo &lt;&lt;Paradigma y paradojas de la hipertrofia ventricular izquierda: desde el laboratorio de investigaci&oacute;n a la consulta cl&iacute;nica&gt;&gt;, publicado en este n&uacute;mero<sup>16</sup> y el cual revela las reflexiones de este grupo de investigadores cuya l&iacute;nea de estudio ha sido la hipertrofia ventricular izquierda, que se demuestra por el extenso n&uacute;mero de publicaciones que tiene al respecto y por lo que esta publicaci&oacute;n merece un comentario editorial. En efecto, &iquest;c&oacute;mo entender y explicar la paradoja de la hipertrofia ventricular izquierda en la que, por un lado, se muestra como un proceso adaptativo que ayuda el funcionamiento ventricular y, por otro, es causa de mortalidad? y &iquest;c&oacute;mo entender la g&eacute;nesis de hipertrofia fisiol&oacute;gica y la posibilidad de transformar la patolog&iacute;a en fisiolog&iacute;a?, reflexiones con las que los autores culminan su conclusi&oacute;n. </font></p>     <p align="justify"><font face="verdana" size="2">Cuando se analiza la funci&oacute;n que cumple la hipertrofia en la fisiolog&iacute;a del coraz&oacute;n adulto, se puede concluir que es un mecanismo que aparece como consecuencia de los procesos de remodelaci&oacute;n ventricular<sup>17</sup> para normalizar el estr&eacute;s sist&oacute;lico en las sobrecargas de presi&oacute;n (hipertensi&oacute;n arterial y estenosis a&oacute;rtica)<sup>18,19 </sup><a href="#f1">(Fig. 1)</a> y el estr&eacute;s diast&oacute;lico en las sobrecargas de volumen (insuficiencia a&oacute;rtica)<sup>20</sup> <a href="#t1">(Tabla I)</a><i>.</i></font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v77n3/a1f1.jpg"></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><a name="t1"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v77n3/a1t1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">En las primeras, el gasto card&iacute;aco se mantiene, a pesar de que el coraz&oacute;n se vac&iacute;a ante una presi&oacute;n significativamente mayor, y como el estr&eacute;s sist&oacute;lico (postcarga), es tambi&eacute;n uno de los m&aacute;s importantes determinantes del MVO<sub>2</sub><sup>21 </sup>al ser normalizado por el mayor engrosamiento mioc&aacute;rdico durante la s&iacute;stole, el aumento de la funci&oacute;n se lleva a cabo sin mayor costo metab&oacute;lico. Asimismo, en las sobrecargas de volumen, la hipertrofia permite normalizar el estr&eacute;s diast&oacute;lico<sup>20,22</sup> <a href="#t1">(Tabla I)</a> y, con ello, el coraz&oacute;n puede desplazar una mayor cantidad de volumen diast&oacute;lico y evitar que la sobrecarga lleve el coraz&oacute;n hacia la insuficiencia card&iacute;aca.<sup>20,22 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Vale la pena enfatizar que tanto en las sobrecargas de presi&oacute;n como en los de volumen, el aumento del crecimiento mioc&iacute;tico se acompa&ntilde;a de un crecimiento intersticial concordante <a href="#f2">(Fig. 2)</a>, lo cual ofrece un soporte estructural a la hipertrofia. Este crecimiento congruente entre la masa mioc&iacute;tica y la col&aacute;gena intersticial, permite al coraz&oacute;n aumentar la funci&oacute;n para enfrentar la sobrecarga, con la caracter&iacute;stica fundamental de <i>no activar el sistema neuroendocrino. </i>De esta manera, la <i>hipertrofia mioc&aacute;rdica se puede considerar como un eficiente mecanismo de compensaci&oacute;n </i>para el coraz&oacute;n,<sup>23 </sup>el cual le permite por un lado mantener una funci&oacute;n normal sin aumentar el consumo de ox&iacute;geno mioc&aacute;rdico (MVO<sub>2</sub>),<sup>21</sup> a pesar del aumento de la fuerza contr&aacute;ctil que provee la hipertrofia compensadora <a href="#f3">(Fig. 3)</a> y todo ello se lleva a cabo sin estimular mecanismos neuro-humorales. En estas condiciones, a la hipertrofia se le denomina &lt;&lt;hipertrofia adecuada&gt;&gt;.<sup>24</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v77n3/a1f2.jpg"></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v77n3/a1f3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">En cl&iacute;nica, es posible reconocer la <b>hipertrofia adecuada </b>en los casos de insuficiencia a&oacute;rtica, cuando es capaz de <b>normalizar el estr&eacute;s diast&oacute;lico </b><a href="#t1">(Tabla I)</a>, o sea, cuando la relaci&oacute;n grosor/ radio (h/r) en diastole se mantiene en cifras normales (0.47 &plusmn; 0.05),<sup>25,26</sup> en presencia de dilataci&oacute;n ventricular izquierda.<sup>22</sup> En el caso de la estenosis a&oacute;rtica y en la hipertensi&oacute;n arterial, la hipertrofia es adecuada cuando el coraz&oacute;n es capaz de normalizar el <b>estr&eacute;s sist&oacute;lico, </b>a pesar de existir una presi&oacute;n intraventricular izquierda muy elevada<sup>18,19</sup> <a href="#f1">(Fig. 1)</a> y ello s&oacute;lo puede lograrse con un engrosamiento sist&oacute;lico muy importante, que concomitantemente reduce en forma muy significativa el radio sist&oacute;lico de la cavidad ventricular <a href="#f3">(Fig. 3)</a>, por un aumento muy considerable de la fuerza contr&aacute;ctil. Este hecho coincide con los hallazgos experimentales de Randhawa y col<sup>27</sup>, en cobayos con hipertrofia adaptativa demostrada histol&oacute;gicamente <a href="#f4">(Fig. 4)</a>, en los que se encuentra aumento del dp/dt.</font></p>     <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v77n3/a1f4.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">La diferencia entre la hipertrofia compensadora de la insuficiencia a&oacute;rtica,<sup>22</sup> en relaci&oacute;n con la estenosis a&oacute;rtica e hipertensi&oacute;n arterial,<sup>18,19</sup> es que, en la primera, la hipertrofia adecuada se manifiesta por una relaci&oacute;n grosor/radio en diastole con valores normales,<sup>22,25</sup> mientras que en las sobrecargas de presi&oacute;n el grado de hipertrofia, que se requiere para normalizar la postcarga, es muy superior a los valores normales (0.70 &plusmn; 0.16 para la hipertensi&oacute;n arterial y 0.97 &plusmn; 0.27 para estenosis a&oacute;rtica), por lo que cae en la categor&iacute;a de <b>hipertrofia inapropiada.</b><sup>18,</sup><sup>19,</sup><sup>24 </sup></font></p>     <p align="justify"><font face="verdana" size="2">El<b> mecanismo de la hipertrofia </b>en estas condiciones, <b>se puede considerar como el m&aacute;s importante </b>para evitar que el coraz&oacute;n sobrecargado presente insuficiencia card&iacute;aca. La hipertrofia mioc&aacute;rdica puede compensar la sobrecarga por mucho tiempo, a veces por a&ntilde;os. Sin embargo, cuando la sobrecarga hemodin&aacute;mica importante se perpet&uacute;a en el tiempo, la hipertrofia puede llegar a ser insuficiente para normalizar el estr&eacute;s diast&oacute;lico tal y como sucede en la insuficiencia a&oacute;rtica <a href="#t1">(Tabla I)</a>, lo cual se manifiesta porque el radio de la cavidad excede en proporci&oacute;n al espesor de la pared y se reduce la relaci&oacute;n grosor/radio (h/r) en diastole <b>(hipertrofia inadecuada </b>o hipertrofia exc&eacute;ntrica),<sup>22-24</sup> aumenta el estr&eacute;s diast&oacute;lico y con ello el engrasamiento sist&oacute;lico es insuficiente para normalizar el estr&eacute;s sist&oacute;lico (postcarga).<sup>20,</sup><sup>22</sup> El ejemplo m&aacute;s evidente de hipertrofia inadecuada es la miocardiopat&iacute;a dilatada, y el papel que la hipertrofia ventricular juega en esta enfermedad es muy importante, ya que se ha demostrado que, entre menos hipertrofia exista (menor valor de la relaci&oacute;n h/r en diastole), es mayor la mortalidad anual.<sup>26</sup> Debido a la relaci&oacute;n inversa que tiene la postcarga con la funci&oacute;n ventricular<sup>28,</sup><sup>29</sup> al aumentar la primera, se reduce la fracci&oacute;n de expulsi&oacute;n paulatinamente hasta llegar a la insuficiencia card&iacute;aca. En esta fase, se activa el sistema neuroendocrino y si &eacute;sta, a su vez, se prolonga en el tiempo, la acci&oacute;n sostenida de la angiotensina II y de la aldosterona favorece que en el intersticio mioc&aacute;rdico se aumente excesivamente la col&aacute;gena<sup>27,30-33</sup> <a href="#f4">(Fig. 4)</a>; y, en estas condiciones, la hipertrofia se transforma paulatinamente de <b>proceso adaptativo a proceso pato-l&oacute;gico</b><sup>23,27,30-32</sup> ya que no es capaz de normalizar la precarga y participa en la progresi&oacute;n de la insuficiencia card&iacute;aca. En lo referente a las sobrecargas de presi&oacute;n (estenosis a&oacute;rtica e hipertensi&oacute;n arterial), la hipertrofia mioc&aacute;rdica, como se mencion&oacute;, tambi&eacute;n juega un papel preponderante en la compensaci&oacute;n hemodin&aacute;mica de la sobrecarga sist&oacute;lica <a href="#f1">(Fig. 1)</a>.<sup>19</sup> Pero, al igual que en la insuficiencia a&oacute;rtica, cuando la sobrecarga se sostiene en el tiempo, el aumento excesivo de col&aacute;gena intersticial,<sup>27</sup> <a href="#f4">(Fig. 4)</a> inicialmente reduce la distensibilidad ventricular y condiciona disfunci&oacute;n diast&oacute;lica.<sup>32,33</sup> Cuando el contenido de col&aacute;gena supera el 200% de sus concentraciones normales, aparece insuficiencia card&iacute;aca<sup>27,32</sup> y es posible que a esta fase corresponda el hallazgo de Escudero y col. en el que demuestra menor capacidad contr&aacute;ctil de coraz&oacute;n de las ratas hipertensas.<sup>34</sup> En efecto, cuando la hipertrofia es insuficiente para normalizar el estr&eacute;s sist&oacute;lico (postcarga), la fracci&oacute;n de expulsi&oacute;n se reduce paulatinamente hasta llegar a la insuficiencia card&iacute;aca <a href="#f1">(Fig. 1)</a>.<sup>29</sup> Cuando la insuficiencia card&iacute;aca es debida a una postcarga excesiva sin da&ntilde;o mioc&aacute;rdico, tal y como puede suceder en la estenosis a&oacute;rtica, el tratamiento quir&uacute;rgico (se reduce la postcarga excesiva) produce una mejor&iacute;a espectacular de la insuficiencia card&iacute;aca.<sup>35</sup> Sin embargo, tanto en la hipertensi&oacute;n arterial como en la estenosis a&oacute;rtica, cuando la hipertrofia se acompa&ntilde;a de un aumento importante de la concentraci&oacute;n de col&aacute;gena intersticial <a href="#f4">(Fig. 4)</a>, la hipertrofia no s&oacute;lo imposibilita la contracci&oacute;n suficiente para normalizar el estr&eacute;s sist&oacute;lico, sino que produce m&uacute;ltiples trastornos en la circulaci&oacute;n coronaria, aumenta la rigidez ventricular, condiciona trastornos de la conducci&oacute;n y del ritmo, y la suma de todos estos cambios estructurales y funcionales, transformar&aacute; la hipertrofia en un proceso patol&oacute;gico<sup>27,30-34</sup> <a href="#f2">(Fig. 2)</a> que en el caso de la hipertensi&oacute;n arterial constituye la &lt;&lt;Cardiopat&iacute;a-hipertensiva&gt;&gt;.<sup>30-32</sup> En la estenosis a&oacute;rtica, tambi&eacute;n se ha demostrado que el da&ntilde;o estructural del miocardio es causado por la activaci&oacute;n cr&oacute;nica del sistema RAA;<sup>8,</sup><sup>30,</sup><sup>-32,</sup><sup>36</sup> as&iacute;, en la estenosis a&oacute;rtica con insuficiencia card&iacute;aca, el d&eacute;ficit de contracci&oacute;n mioc&aacute;rdica puede ser debido a sobrecarga excesiva o a da&ntilde;o mioc&aacute;rdico intr&iacute;nseco, en este &uacute;ltimo caso, no se alivia la insuficiencia card&iacute;aca al reducir la postcarga con la cirug&iacute;a valvular a&oacute;rtica.<sup>35 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Si bajo estos preceptos, analizamos los estudios que demuestran que la hipertrofia mioc&aacute;rdica es un marcador de mortalidad,<sup>1-9,11,12</sup> podremos entender que se refieren a <i>hipertrofia patol&oacute;gi</i>ca<sup>30,33,36</sup> <a href="#f4">(Fig. 4)</a> y no es que necesariamente la hipertrofia mioc&aacute;rdica siempre represente una &lt;&lt;mala adaptaci&oacute;n&gt;&gt; a la sobrecarga, ni que la hipertrofia sea un proceso necesariamente anormal, y siempre sea un marcador de enfermedad y muerte. M&aacute;s a&uacute;n, la falta de hipertrofia y de crecimiento de col&aacute;gena intersticial congruente en la insuficiencia mitral cr&oacute;nica, son los responsable de que aparezca da&ntilde;o mioc&aacute;rdico imperceptible, porque esta valvulopat&iacute;a no desarrolla hipertrofia tempranamente en su evoluci&oacute;n, debido a que funciona con postcarga baja<sup>37</sup> y ello da lugar a que la presencia de hipertrofia inadecuada (relaci&oacute;n h/r en diastole 0.36 &plusmn; 0.05) coincida con fracci&oacute;n de expulsi&oacute;n normal.<sup>38,39</sup> Este comportamiento es el responsable de la evoluci&oacute;n postoperatoria significativamente menos buena en relaci&oacute;n con la insuficiencia a&oacute;rtica.<sup>40,41</sup> Al igual que la insuficiencia mitral cr&oacute;nica, en la mayor&iacute;a de los casos de infarto del miocardio anterior extenso transmural, la hipertrofia de la pared posterior, que intenta ser compensadora, no logra normalizar el estr&eacute;s diast&oacute;lico ni sist&oacute;lico, lo cual da lugar a la remodelaci&oacute;n ventricular patol&oacute;gica progresiva.<sup>42</sup> Con respecto a la miocardiopat&iacute;a hipertr&oacute;fica, realmente es una enfermedad mioc&aacute;rdica primaria, no es un mecanismo adaptativo y caracter&iacute;sticamente es una <b>hipertrofia patol&oacute;gica </b>que no responde a la necesidad de normalizar el estr&eacute;s diast&oacute;lico o sist&oacute;lico del coraz&oacute;n de estos enfermos,<sup>43</sup> por lo cual se comporta como una hipertrofia inapropiada<sup>24</sup> con las consecuencias a las que &eacute;sta da lugar y sin los beneficios que ofrece la hipertrofia en un coraz&oacute;n con sobrecarga hemodin&aacute;mica.</font></p>     <p align="justify"><font face="verdana" size="2">Finalmente, la posibilidad de lograr regresi&oacute;n de la hipertrofia al reducir la carga hemodin&aacute;mica excesiva,<sup>44</sup> incluso con reducci&oacute;n de col&aacute;gena intersticial, al bloquear los efectos de la angiotensina II con inhibidores de la Eca<sup>44-47</sup> o de la aldosterona (espironolactona o eplerrenona), preservando intacta la funci&oacute;n ventricular, se ha denominado &lt;&lt;cardiorreparaci&oacute;n&gt;&gt;.<sup>45</sup> Estos conceptos adquieren importancia cl&iacute;nica, ya que al lograrse la regresi&oacute;n de la hipertrofia adaptativa o patol&oacute;gica, es posible cambiar el pron&oacute;stico para la vida de estos enfermos. </font></p>     <p align="justify"><font face="verdana" size="2">En conclusi&oacute;n, la hipertrofia adaptativa es un eficiente mecanismo de compensaci&oacute;n, que permite mantener vivo y en condiciones de normalidad la funci&oacute;n card&iacute;aca por largos periodos de tiempo, defiende al paciente de la insuficiencia card&iacute;aca y de la muerte, puede haber regresi&oacute;n de la hipertrofia cuando la causa se corrige oportunamente. La falta de hipertrofia adaptativa es nociva en los pacientes con insuficiencia mitral,<sup>28,</sup><sup>37,</sup><sup>38,</sup><sup>40</sup> miocardiopat&iacute;a dilatada<sup>26</sup> e infarto transmural extenso,<sup>42</sup> porque al no defender al coraz&oacute;n de la remodelaci&oacute;n patol&oacute;gica, aparece insuficiencia cardiaca progresiva que es una alta proporci&oacute;n de estos pacientes evolucionan hacia la muerte. Por otro lado, la progresi&oacute;n hacia la hipertrofia patol&oacute;gica es temible, porque es un marcador muy importante para mortalidad cardiovascular.<sup>1-11</sup> Las aportaciones de Escudero y Padilla,<sup>16</sup> en conjunto con todas las de los otros investigadores que han ofrecido conocimientos para el entendimiento de la funci&oacute;n y significado de la hipertrofia ventricular izquierda, son contribuciones que nos ayudan a tener una interpretaci&oacute;n panor&aacute;mica m&aacute;s adecuada para aplicarla en la cl&iacute;nica a la cabecera del enfermo.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Levy D, Anderson KM, Savage D, Kannel WB, Christiansen JC, Castelli WP: <i>Echocardiographically detected left ventricular hypertrophy: prevalence and risk factors. 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