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<front>
<journal-meta>
<journal-id>0120-5633</journal-id>
<journal-title><![CDATA[Revista Colombiana de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Colomb. Cardiol.]]></abbrev-journal-title>
<issn>0120-5633</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Cardiologia. Oficina de Publicaciones]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56332012000600012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Consenso sobre la clasificación de la enfermedad vascular pulmonar hipertensiva en niños: reporte del task force pediátrico del Pulmonary Vascular Research Institute (PVRI) Panamá 2011]]></article-title>
<article-title xml:lang="en"><![CDATA[A consensus approach to the classification of pediatric pulmonary hypertensive vascular disease: Report from the PVRI Pediatric Taskforce, Panama 2011]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[del Cerro]]></surname>
<given-names><![CDATA[María Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abman]]></surname>
<given-names><![CDATA[Steven]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Heath Freudenthal]]></surname>
<given-names><![CDATA[Alexandra]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Freudenthal]]></surname>
<given-names><![CDATA[Franz]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Harikrishnan]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Haworth]]></surname>
<given-names><![CDATA[Sheila G]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dunbar]]></surname>
<given-names><![CDATA[Ivy]]></given-names>
</name>
<xref ref-type="aff" rid="A07"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopes]]></surname>
<given-names><![CDATA[Antonio A]]></given-names>
</name>
<xref ref-type="aff" rid="A07"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Usha Raj]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<xref ref-type="aff" rid="A08"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval]]></surname>
<given-names><![CDATA[Julio]]></given-names>
</name>
<xref ref-type="aff" rid="A09"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stenmark]]></surname>
<given-names><![CDATA[Kurt]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Adatia]]></surname>
<given-names><![CDATA[Ian]]></given-names>
</name>
<xref ref-type="aff" rid="A10"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,La Paz Children's Hospital  ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Colorado School of Medicine  ]]></institution>
<addr-line><![CDATA[Aurora ]]></addr-line>
<country>USA</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Kardiozentrum  ]]></institution>
<addr-line><![CDATA[La Paz ]]></addr-line>
<country>Bolivia</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Sree Chitra Tirunal Institute for Medical Sciences and Technology  ]]></institution>
<addr-line><![CDATA[Trivandrum ]]></addr-line>
<country>India</country>
</aff>
<aff id="A06">
<institution><![CDATA[,University College  ]]></institution>
<addr-line><![CDATA[London ]]></addr-line>
<country>UK</country>
</aff>
<aff id="A07">
<institution><![CDATA[,University of São Paulo  ]]></institution>
<addr-line><![CDATA[São Paulo ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="A08">
<institution><![CDATA[,University of Chicago at Illinois  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A09">
<institution><![CDATA[,National Institute of Cardiology  ]]></institution>
<addr-line><![CDATA[Mexico ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A10">
<institution><![CDATA[,Stollery Children's Hospital  ]]></institution>
<addr-line><![CDATA[Edmonton Alberta]]></addr-line>
<country>Canada</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>19</volume>
<numero>6</numero>
<fpage>339</fpage>
<lpage>352</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56332012000600012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56332012000600012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56332012000600012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las clasificaciones actuales de la hipertensión pulmonar han contribuido significativamente al conocimiento de la enfermedad vascular pulmonar, han facilitado ensayos farmacológicos y han mejorado nuestro conocimiento de las cardiopatías congénitas del adulto; sin embargo estas clasificaciones no son aplicables completamente a la enfermedad en el niño. La clasificación que aquí se propone se basa principalmente en la práctica clínica. Los objetivos específicos de esta nueva clasificación son mejorar las estrategias diagnósticas, promover la investigación clínica, mejorar nuestro conocimiento de la patogénesis, de la fisiología y de la epidemiología de la enfermedad y orientar el desarrollo de modelos de la enfermedad humana en el laboratorio y estudios en animales; también puede servir como un recurso docente. Se hace énfasis en los conceptos de maladaptación perinatal, alteraciones del desarrollo e hipoplasia pulmonar como factores causantes de la hipertensión pulmonar pediátrica; así mismo, en la importancia de los múltiples síndromes malformativos congénitos, genéticos y cromosómicos en la presentación de la hipertensión pulmonar pediátrica. La enfermedad vascular pulmonar hipertensiva en niños se divide en diez grandes categorías.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Current classifications of pulmonary hypertension have contributed a great deal to our understanding of pulmonary vascular disease, facilitated drug trials, and improved our understanding of congenital heart disease in adult survivors. However, these classifications are not applicable readily to pediatric disease. The classification system that we propose is based firmly in clinical practice. The specific aims of this new system are to improve diagnostic strategies, to promote appropriate clinical investigation, to improve our understanding of disease pathogenesis, physiology and epidemiology, and to guide the development of human disease models in laboratory and animal studies. It should be also an educational resource. We emphasize the concepts of perinatal maladaptation, maldevelopment and pulmonary hypoplasia as causative factors in pediatric pulmonary hypertension. We highlight the importance of genetic, chromosomal and multiple congenital malformation syndromes in the presentation of pediatric pulmonary hypertension. We divide pediatric pulmonary hypertensive vascular disease into 10 broad categories.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hipertensión arterial pulmonar]]></kwd>
<kwd lng="es"><![CDATA[cardiopatía congénita]]></kwd>
<kwd lng="es"><![CDATA[Pediatría]]></kwd>
<kwd lng="en"><![CDATA[pulmonary arterial hypertension]]></kwd>
<kwd lng="en"><![CDATA[congenital heart disease]]></kwd>
<kwd lng="en"><![CDATA[Pediatrics]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">     <P>    <center><font size="4"><B>Consenso sobre la clasificaci&oacute;n de la enfermedad vascular pulmonar hipertensiva en ni&ntilde;os: reporte del task force pedi&aacute;trico del Pulmonary Vascular Research Institute (PVRI) Panam&aacute; 2011</B></font></center></P>     <P>    <center><font size="3"><B>A consensus approach to the classification of pediatric pulmonary hypertensive vascular disease: Report from the PVRI Pediatric Taskforce, Panama 2011</B></font></center></P>     <p>    <center>Mar&iacute;a Jes&uacute;s del Cerro<sup>(1)</sup>; Steven Abman<sup>(2)</sup>; Gabriel D&iacute;az<sup>(3)</sup>; Alexandra Heath Freudenthal<sup>(4)</sup>; Franz Freudenthal<sup>(4)</sup>; S. Harikrishnan<sup>(5)</sup>; Sheila G. Haworth<sup>(6)</sup>; Dunbar Ivy<sup>(7)</sup>; Antonio A. Lopes<sup>(7)</sup>; J. Usha Raj<sup>(8)</sup>; Julio Sandoval<sup>(9)</sup>; Kurt Stenmark<sup>(2)</sup>; Ian Adatia<sup>(10)</sup> </center></p>     <p>Este art&iacute;culo corresponde a una traducci&oacute;n autorizada del trabajo original publicado en Pulm Circ. 2011 Apr-Jun; 1 (2): 286-298. </p>     <p><sup>(1)</sup>	La Paz Children's Hospital, Madrid, Spain.    <br> <sup>(2)</sup>	Children's Hospital, University of Colorado School of Medicine, Aurora, Colorado, USA.    ]]></body>
<body><![CDATA[<br> <sup>(3)</sup>	Universidad Nacional de Colombia, Bogot&aacute;, Colombia.    <br> <sup>(4)</sup>	Kardiozentrum, La Paz, Bolivia.    <br> <sup>(5)</sup>	Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, India.    <br> <sup>(6)</sup>	University College, London, UK.    <br>  <sup>(7)</sup>	Heart Institute, University of S&atilde;o Paulo, S&atilde;o Paulo, Brazil.    <br>   <sup>(8)</sup>	University of Chicago at Illinois, Chicago, USA.    <br>   <sup>(9)</sup>	National Institute of Cardiology, Mexico City, Mexico.    <br> <sup>(10)</sup>	Stollery Children's Hospital, University of Alberta, Edmonton, Alberta, Canada. </p>     <p><b>Correspondencia</b>: Dr. Astrid E. Lammers. Department of Paediatric Cardiology, Great Ormond Street Hospital for Children, Great Ormond Street, London WC1N 3JH, UK E-mail: <a href="mailto:astridlammers@gmx.de">astridlammers@gmx.de</a></p>     <p>  Recibido: 08/10/2012. Aceptado: 10/10/2012.</p> <hr size="1">     ]]></body>
<body><![CDATA[<p> Las clasificaciones actuales de la hipertensi&oacute;n pulmonar han contribuido  significativamente al conocimiento de la enfermedad vascular pulmonar, han facilitado ensayos farmacol&oacute;gicos y han mejorado nuestro conocimiento de las cardiopat&iacute;as cong&eacute;nitas del adulto; sin embargo estas clasificaciones no son aplicables completamente a la enfermedad en el ni&ntilde;o. La clasificaci&oacute;n que aqu&iacute; se propone se basa principalmente en la pr&aacute;ctica cl&iacute;nica. Los objetivos espec&iacute;ficos de esta nueva clasificaci&oacute;n son mejorar las estrategias diagn&oacute;sticas, promover la investigaci&oacute;n cl&iacute;nica, mejorar nuestro conocimiento de la patog&eacute;nesis, de la fisiolog&iacute;a y de la epidemiolog&iacute;a de la enfermedad y orientar el desarrollo de modelos de la enfermedad humana en el laboratorio y estudios en animales; tambi&eacute;n puede servir como un recurso docente. Se hace &eacute;nfasis en los conceptos de maladaptaci&oacute;n perinatal, alteraciones del desarrollo e hipoplasia pulmonar como factores causantes de la hipertensi&oacute;n pulmonar pedi&aacute;trica; as&iacute; mismo, en la importancia de los m&uacute;ltiples s&iacute;ndromes malformativos cong&eacute;nitos, gen&eacute;ticos y cromos&oacute;micos en la presentaci&oacute;n de la hipertensi&oacute;n pulmonar pedi&aacute;trica. La enfermedad vascular pulmonar hipertensiva en ni&ntilde;os se divide en diez grandes categor&iacute;as.</p>       <p><b><i>Palabras clave</i></b>: hipertensi&oacute;n arterial pulmonar, cardiopat&iacute;a cong&eacute;nita, Pediatr&iacute;a.</p>    <hr size="1">      <p>Current classifications of pulmonary hypertension have contributed a great deal to our understanding of pulmonary vascular disease, facilitated drug trials, and improved our understanding of congenital heart disease in adult survivors. However, these classifications are not applicable readily to pediatric disease. The classification system that we propose is based firmly in clinical practice. The specific aims of this new system are to improve diagnostic strategies, to promote appropriate clinical investigation, to improve our understanding of disease pathogenesis, physiology and epidemiology, and to guide the development of human disease models in laboratory and animal studies. It should be also an educational resource. We emphasize the concepts of perinatal maladaptation, maldevelopment and pulmonary hypoplasia as causative factors in pediatric pulmonary hypertension. We highlight the importance of genetic, chromosomal and multiple congenital malformation syndromes in the presentation of pediatric pulmonary hypertension. We divide pediatric pulmonary hypertensive vascular disease into 10 broad categories.</p>       <p><b><i>Keywords</i></b>: pulmonary arterial hypertension, congenital heart disease, Pediatrics.</p> <hr size="1">       <P>Introducci&oacute;n</P>       <p>La clasificaci&oacute;n de la hipertensi&oacute;n pulmonar que fue concebida en el Simposium de Evian organizado por la OMS en 1998 (1), y las posteriores revisiones y modificaciones de Venecia (2) y Dana Point (3) han contribuido enormemente al conocimiento de la enfermedad vascular pulmonar, han facilitado los ensayos farmacol&oacute;gicos y han mejorado nuestro conocimiento de las cardiopat&iacute;as cong&eacute;nitas del adulto; sin embargo, estas clasificaciones no son aplicables del todo a la edad pedi&aacute;trica (4-7). Del debate sobre la clasificaci&oacute;n de la hipertensi&oacute;n pulmonar en el ni&ntilde;o en la reuni&oacute;n del Pulmonary Vascular Research Institute (PVRI) en Lisboa (Portugal) en 2010, surgi&oacute; la necesidad bien reconocida del desarrollo de una clasificaci&oacute;n de la enfermedad vascular pulmonar hipertensiva en el ni&ntilde;o. Tambi&eacute;n se reconoci&oacute; que los m&eacute;dicos que tienen bajo su cuidado adultos con cardiopat&iacute;a cong&eacute;nita deben estar en capacidad de usar esta clasificaci&oacute;n. Esto dio origen al inicio del Taskforce pedi&aacute;trico que se present&oacute; en la reuni&oacute;n del PVRI en Panam&aacute; en 2011 cuyos resultados se resumen en este art&iacute;culo.</p>       <P>Discusi&oacute;n</P>       <p><b>Dificultades para aplicar la clasificaci&oacute;n de Dana Point al paciente pedi&aacute;trico</b></p>       <p>Las &aacute;reas de particular dificultad para aplicar la clasificaci&oacute;n de Dana Point (3) al paciente pedi&aacute;trico se mencionan aqu&iacute; brevemente y en forma m&aacute;s extensa bajo encabezamientos espec&iacute;ficos en este art&iacute;culo. Las causas fetales de la enfermedad vascular pulmonar son importantes no solo en el paciente pedi&aacute;trico sino tambi&eacute;n en el adulto ya que es probable que los eventos perinatales desempe&ntilde;en un papel clave en el establecimiento del riesgo de hipertensi&oacute;n pulmonar. La clasificaci&oacute;n de Dana Point no reconoce la importancia potencial de los mecanismos del desarrollo. La enfermedad vascular pulmonar hipertensiva, incluso cuando se presenta en la edad adulta puede estar relacionada con el desarrollo fetal, perinatal y de la temprana infancia. En la actualidad se reconocen muy bien las causas perinatales de la hipertensi&oacute;n sist&eacute;mica y de la enfermedad arterial coronaria del adulto (8). La enfermedad vascular pulmonar neonatal recibi&oacute; una atenci&oacute;n poco significativa en Evian, Venecia y Dana Point; particularmente no se se&ntilde;alaron los conceptos de maladaptaci&oacute;n perinatal, alteraciones del desarrollo e hipoplasia pulmonar como causales de la hipertensi&oacute;n pulmonar. Adem&aacute;s, como herramienta para la valoraci&oacute;n cl&iacute;nica en la vida real del ni&ntilde;o, la clasificaci&oacute;n de Dana Point no refleja la compleja heterogeneidad de factores que contribuyen a la enfermedad vascular pulmonar pedi&aacute;trica (6) (<a href="#figura1">Figura 1</a>). Por ejemplo, en la pr&aacute;ctica pedi&aacute;trica, con frecuencia se eval&uacute;an pacientes con hipertensi&oacute;n pulmonar que pueden haber nacido prematuramente, con anomal&iacute;as cromos&oacute;micas o gen&eacute;ticas, con cardiopat&iacute;as, as&iacute; como los pacientes con apneas del sue&ntilde;o, broncoaspiraci&oacute;n cr&oacute;nica y enfermedad parenquimatosa pulmonar secundaria.</p>       <p>    ]]></body>
<body><![CDATA[<center>     <a name="figura1"></a>    <br>     <img src="img/revistas/rcca/v19n6/v19n6a12f1.gif">   </center></p>     <P>Objetivos de la &quot;clasificaci&oacute;n Panam&aacute;&quot; del PVRI</P>       <p>La clasificaci&oacute;n que se propone se basa principalmente en la pr&aacute;ctica cl&iacute;nica. Los objetivos espec&iacute;ficos de esta clasificaci&oacute;n son: mejorar las estrategias diagn&oacute;sticas, promover la investigaci&oacute;n cl&iacute;nica y mejorar nuestro conocimiento de la patog&eacute;nesis, fisiolog&iacute;a y epidemiolog&iacute;a de la enfermedad y orientar el desarrollo de modelos de la enfermedad humana en el laboratorio y estudios en animales; tambi&eacute;n puede ser un recurso docente. Esta clasificaci&oacute;n no se basa en el tratamiento de la hipertensi&oacute;n pulmonar ni est&aacute; dise&ntilde;ada para ser una gu&iacute;a terap&eacute;utica. La utilidad de un sistema clasificatorio efectivo se sustenta en su capacidad de ayuda para que nuestras observaciones en cada ni&ntilde;o tengan sentido; adem&aacute;s, debe estar suficientemente estructurado, de tal manera que permita una clasificaci&oacute;n inequ&iacute;voca pero lo suficientemente flexible que facilite la inclusi&oacute;n de ideas a&uacute;n no descritas. Las clasificaciones son &uacute;tiles en medicina si ellas proporcionan una estructura adecuada para el diagn&oacute;stico y manejo de una enfermedad y estimulan una visi&oacute;n epidemiol&oacute;gica. Una clasificaci&oacute;n perfecta, como la tabla peri&oacute;dica, tambi&eacute;n tendr&iacute;a categor&iacute;as que puedan incluir enfermedades no descritas o mecanismos para enfermedades complejas conocidas.</p>       <p>Agradecemos el gran valor de la clasificaci&oacute;n de Dana Point (3) por lo cual se han dejado aspectos no modificados. Somos conscientes de que si la clasificaci&oacute;n que sugerimos tiene alg&uacute;n m&eacute;rito es porque (parafraseando a Isaac Newton en 1676) solamente estando sobre los hombros de los gigantes seremos capaces de ver m&aacute;s lejos. Con esto en mente proponemos una clasificaci&oacute;n nueva de la enfermedad vascular pulmonar hipertensiva pedi&aacute;trica.</p>       <p><b>Esquema general</b></p>       <p>Hemos usado el t&eacute;rmino enfermedad vascular pulmonar hipertensiva pedi&aacute;trica en lugar de hipertensi&oacute;n pulmonar para excluir los pacientes que tienen hipertensi&oacute;n pulmonar sin que exista una resistencia vascular pulmonar elevada (<a href="#tabla1">Tabla 1</a>). Eso ocurre en ni&ntilde;os que tienen grandes cortocircuitos sist&eacute;mico-pulmonares. Estos ni&ntilde;os no requieren tratamiento farmacol&oacute;gico para la hipertensi&oacute;n pulmonar sino cirug&iacute;a oportuna para cerrar el defecto; sin embargo, incluimos ni&ntilde;os que han sido sometidos a varias etapas quir&uacute;rgicas para tratamiento de coraz&oacute;n univentricular que tienen resistencia vascular pulmonar elevada pero con una presi&oacute;n arterial pulmonar media menor de 25 mm Hg. Por lo tanto, sugerimos que la enfermedad vascular pulmonar hipertensiva en ni&ntilde;os sea definida como una presi&oacute;n arterial pulmonar media mayor de 25 mm Hg y un &iacute;ndice de resistencia vascular pulmonar mayor a 3 unidades Wood/m<sup>2</sup> para circulaci&oacute;n biventricular. Sugerimos que la enfermedad vascular pulmonar hipertensiva despu&eacute;s de la anastomosis cavo pulmonar sea definida como un &iacute;ndice de resistencia vascular pulmonar mayor de 3 unidades Wood/m2 o un gradiente transpulmonar mayor de 6 mm Hg (presi&oacute;n arterial pulmonar media menos presi&oacute;n media auricular izquierda), aunque la presi&oacute;n arterial pulmonar media sea menor de 25 mm Hg. Advertimos, adem&aacute;s, que la resistencia vascular pulmonar calculada puede estar aumentada no solamente por incremento del gradiente transpulmonar sino tambi&eacute;n por la presencia de flujo pulmonar disminuido. Somos conscientes de que el flujo sangu&iacute;neo pulmonar puede ser dif&iacute;cil de valorar despu&eacute;s de una anastomosis cavo pulmonar debido a la presencia de flujo pulmonar de varios or&iacute;genes.</p>       <p>    <center>     <a name="tabla1"></a>    <br>     <img src="img/revistas/rcca/v19n6/v19n6a12t1.gif">   </center></p>     ]]></body>
<body><![CDATA[<p>La presi&oacute;n en cu&ntilde;a y las presiones auricular izquierda o ventricular sist&eacute;mica de fin de di&aacute;stole, pueden ser normales o elevadas y estos valores son importantes al considerar el diagn&oacute;stico diferencial.</p>       <p>Hemos dividido la enfermedad vascular pulmonar hipertensiva en ni&ntilde;os en diez categor&iacute;as que se se&ntilde;alan en orden de frecuencia de presentaci&oacute;n (<a href="#tabla1" target="_blank">Tabla 1</a>). No se ha publicado ning&uacute;n estudio epidemiol&oacute;gico o registro de hipertensi&oacute;n pulmonar en ni&ntilde;os a la fecha, por lo que podemos decir que las publicaciones han excluido alguna(s) de las categor&iacute;as de la clasificaci&oacute;n que proponemos; por lo tanto cuando esos datos est&eacute;n disponibles, el orden de las categor&iacute;as necesitar&iacute;an una revisi&oacute;n. Hacemos &eacute;nfasis en que hemos intentado proporcionar una clasificaci&oacute;n cl&iacute;nicamente &uacute;til (<a href="img/revistas/rcca/v19n6/v19n6a12t2.gif" target="_blank">Tabla 2</a>) que permita la categorizaci&oacute;n de pacientes con causas multifactoriales de hipertensi&oacute;n pulmonar principalmente cuando se asocia con un s&iacute;ndrome o anomal&iacute;a cromos&oacute;mica. Para expresar lo heterog&eacute;neo de la enfermedad vascular pulmonar en ni&ntilde;os, hemos incluido la posibilidad de que una enfermedad o condici&oacute;n pueda aparecer en diferentes categor&iacute;as. Esto puede ocurrir por ejemplo, cuando enfermedades como la de c&eacute;lulas falciformes, o s&iacute;ndromes como el de cimitarra o antifosfol&iacute;pido pueden causar diferentes tipos de enfermedad vascular pulmonar hipertensiva.</p>       <P>Categor&iacute;a uno</P>       <p><b>Enfermedad vascular pulmonar prenatal o del desarrollo</b></p>       <p>Quiz&aacute;s la diferencia m&aacute;s significativa entre el inicio de la enfermedad vascular pulmonar hipertensiva del adulto y el ni&ntilde;o es que durante la vida fetal, neonatal o postnatal temprana, la vasculatura pulmonar est&aacute; expuesta a insultos patol&oacute;gicos y/o ambientales mientras permanece a&uacute;n en etapa de crecimiento y maduraci&oacute;n, lo que puede dar origen a maladaptaci&oacute;n, alteraci&oacute;n del desarrollo o detenci&oacute;n del crecimiento. Los intentos naturales de recuperaci&oacute;n de los insultos pueden estar influenciados por los determinantes del desarrollo y la maduraci&oacute;n. Esto puede originar secuelas &uacute;nicas y diferentes de las que se ven en adultos expuestos a un insulto similar (<a href="img/revistas/rcca/v19n6/v19n6a12t2.gif" target="_blank">Tabla 2</a>). La unidad vascular pulmonar est&aacute; compuesta de alv&eacute;olos, bronqu&iacute;olos, capilares, arteriolas, v&eacute;nulas y canales linf&aacute;ticos, y el desarrollo es dependiente el uno del otro (9). La enfermedad de un elemento de la unidad vascular pulmonar puede afectar otros componentes, como ocurre por ejemplo en la hipertensi&oacute;n pulmonar persistente del reci&eacute;n nacido, en la displasia broncopulmonar (10) (<a href="#figura2">Figura 2</a>) y en la displasia alv&eacute;olo-capilar con mal alineamiento de las venas pulmonares (11).</p>       <p>    <center>     <a name="figura2"></a>    <br>     <img src="img/revistas/rcca/v19n6/v19n6a12f2.gif">   </center></p>     <p>In &uacute;tero la circulaci&oacute;n pulmonar fetal se caracteriza por presi&oacute;n arterial pulmonar elevada y resistencia arterial pulmonar marcadamente elevada. En las primeras horas de vida, los eventos circulatorios y respiratorios dram&aacute;ticos que ocurren dan origen a vasodilataci&oacute;n pulmonar y al remodelamiento del lecho vascular pulmonar, lo cual reduce la resistencia vascular pulmonar con el consecuente aumento del flujo pulmonar. Si ocurre una circulaci&oacute;n transicional pulmonar exitosa, la presi&oacute;n arterial pulmonar media disminuye en las primeras tres semanas de vida hasta un nivel de 10 a 20 mm Hg, es decir a niveles similares a los del adulto (12). En los ni&ntilde;os peque&ntilde;os el &iacute;ndice de resistencia vascular pulmonar es similar al del adulto (13). A pesar de esta adaptaci&oacute;n fisiol&oacute;gica con reducci&oacute;n de la resistencia vascular pulmonar, el aspecto ultraestructural de las c&eacute;lulas del m&uacute;sculo liso no se parece al de las del adulto hasta alrededor de los 2 a&ntilde;os de edad (14) y los factores de crecimiento fetal pueden influenciar la forma y funci&oacute;n de la vasculatura pulmonar postnatal (10).</p>       <p>Es claro que los especialistas en hipertensi&oacute;n pulmonar pedi&aacute;trica manejan un n&uacute;mero creciente de neonatos y ni&ntilde;os cuya hipertensi&oacute;n pulmonar puede tener un origen fetal, en particular la asociaci&oacute;n de pre-eclampsia y displasia broncopulmonar (15), des&oacute;rdenes asociados con hipoplasia pulmonar y enfermedades asociadas con enfermedad vascular pulmonar in &uacute;tero (11, 16-25). La hipoplasia pulmonar, que resulta de la detenci&oacute;n del desarrollo, es un concepto importante en cualquier clasificaci&oacute;n de enfermedad vascular pulmonar neonatal. La enfermedad vascular hipertensiva en ni&ntilde;os puede ocurrir en el contexto de varios grados de hipoplasia pulmonar, lo cual ha sido bien documentado particularmente en cardiopat&iacute;as cong&eacute;nitas (9), hernia diafragm&aacute;tica cong&eacute;nita (26) y s&iacute;ndrome de Down (27, 28). Tambi&eacute;n es relevante que la alveolarizaci&oacute;n y el desarrollo vascular pulmonar pueden continuar hasta los ocho a&ntilde;os de vida (9). No se conoce muy bien la velocidad de crecimiento vascular y los cambios en el &aacute;rea de secci&oacute;n vascular pulmonar al nacimiento o en los primeros a&ntilde;os de vida. Puede encontrarse hipoplasia pulmonar significativa en alrededor del 10% de autopsias neonatales y hasta en 50% de neonatos con anomal&iacute;as cong&eacute;nitas (28-29). Es posible que diversos insultos vasculares postnatales, incluso los que resultan en la aparici&oacute;n de la enfermedad en la edad adulta, puedan dar origen a hipertensi&oacute;n pulmonar si los pacientes nacieron con un &aacute;rea de secci&oacute;n vascular pulmonar por debajo del percentil 3. Por tanto, la probabilidad de que se desarrolle hipertensi&oacute;n pulmonar a trav&eacute;s de la vida puede estar relacionada con el &aacute;rea de secci&oacute;n arteriolar inicial al nacimiento con los efectos de cada insulto sucesivo debidos, al menos parcialmente, al balance entre la reserva vascular pulmonar y la tasa de desgaste vascular pulmonar debida al insulto patol&oacute;gico ya sea gen&eacute;tico, epigen&eacute;tico o ambiental.</p>       ]]></body>
<body><![CDATA[<P>Categor&iacute;a dos</P>       <p><b>Maladaptaci&oacute;n vascular pulmonar perinatal</b></p>       <p>Esta categor&iacute;a incluye solamente al s&iacute;ndrome de hipertensi&oacute;n pulmonar persistente del reci&eacute;n nacido (HPPRN) (<a href="img/revistas/rcca/v19n6/v19n6a12t2.gif" target="_blank">Tabla 2</a>). Reconocemos que hay considerable debate sobre los or&iacute;genes de la HPPRN y que ella puede reflejar una enfermedad vascular pulmonar in &uacute;tero (30). Observaciones cl&iacute;nicas sobre neonatos con HPPRN severa que mueren durante los primeros d&iacute;as despu&eacute;s del nacimiento y ya tienen signos patol&oacute;gicos de enfermedad vascular pulmonar cr&oacute;nica, sugieren que eventos intrauterinos pueden desempe&ntilde;ar un  papel importante como causa de este s&iacute;ndrome (30-32). Est&iacute;mulos intrauterinos adversos que ocurren al final de la gestaci&oacute;n como flujo sangu&iacute;neo anormal, cambios en el sustrato o liberaci&oacute;n de hormonas al pulm&oacute;n, hipoxia cr&oacute;nica, hipertensi&oacute;n sist&eacute;mica cr&oacute;nica, inflamaci&oacute;n u otras causas, pueden alterar potencialmente la funci&oacute;n y estructura vascular pulmonar contribuyendo a las anormalidades de adaptaci&oacute;n postnatal (33, 34). Es probable que a medida que se conozcan mejor los mecanismos de la HPPRN, sea necesario revaluar la clasificaci&oacute;n; sin embargo, hasta el momento la mayor&iacute;a reconoce que la HPPRN es un desorden de la transici&oacute;n de la vida intrauterina a la extrauterina (35-43).</p>       <p>Los neonatos que nacen en la altura, con frecuencia necesitan m&aacute;s tiempo para adaptarse a la vida extrauterina y algunos de ellos requieren ox&iacute;geno suplementario por algunas semanas. Debido a la altura, la presi&oacute;n pulmonar permanece elevada por encima de los valores normales para la edad y hay un retraso en el remodelamiento arterial pulmonar despu&eacute;s del nacimiento (44). Tambi&eacute;n reconocemos el efecto considerable del nacimiento a grandes alturas (mayor de 2.500 m/snm) en el periodo postnatal temprano. Estas nuevas observaciones (4, 45) contrastan con informes previos (46). La HPPRN es una enfermedad que generalmente se presenta en los primeros d&iacute;as despu&eacute;s del nacimiento; por lo tanto, ser&iacute;a prudente acelerar y ampliar la evaluaci&oacute;n diagn&oacute;stica de cualquier neonato que presente hipertensi&oacute;n pulmonar sintom&aacute;tica mas all&aacute; de la primera semana de vida ya que la etiolog&iacute;a puede no ser una HPPRN.</p>       <P>Categor&iacute;a tres</P>       <p><b>Enfermedad cardiovascular pedi&aacute;trica (cardiopat&iacute;a)</b></p>       <p>En forma global, la enfermedad cardiovascular pedi&aacute;trica puede ser la causa m&aacute;s com&uacute;n de enfermedad vascular pulmonar en ni&ntilde;os (<a href="img/revistas/rcca/v19n6/v19n6a12t2.gif" target="_blank">Tabla 2</a>) (47-49).</p>       <p>En esta secci&oacute;n de la clasificaci&oacute;n, la lista de cardiopat&iacute;as es m&aacute;s extensa que la de la clasificaci&oacute;n de Dana Point pero hemos mantenido la estructura b&aacute;sica de esta &uacute;ltima clasificaci&oacute;n en lo relacionado con los cortocircuitos (5, 7, 50, 51). Consideramos que lo esencial en el diagn&oacute;stico de un ni&ntilde;o con cortocircuito e &iacute;ndice de resistencia vascular pulmonar elevado, es concluir si requiere una cirug&iacute;a o una evaluaci&oacute;n posterior. Hay considerable inter&eacute;s en evaluar si un periodo de tratamiento m&eacute;dico puede permitir un reparo quir&uacute;rgico en aquellos pacientes que tienen resistencias vasculares pulmonares lim&iacute;trofes.</p>       <p>La interacci&oacute;n entre cardiopat&iacute;a cong&eacute;nita y factores gen&eacute;ticos con frecuencia dificulta clasificar la causa de la enfermedad vascular pulmonar con certeza. Por ejemplo, &iquest;c&oacute;mo puede clasificarse un ni&ntilde;o que tiene un defecto del canal atrioventricular y una mutaci&oacute;n del BMPR2? (52) o &iquest;c&oacute;mo puede clasificarse un ni&ntilde;o con un peque&ntilde;o cortocircuito y una anomal&iacute;a cromos&oacute;mica coexistente? Esta clasificaci&oacute;n permite que esta eventualidad pueda ser clarificada en el futuro porque tenemos en cuenta la interacci&oacute;n gen&eacute;tica entre la cardiopat&iacute;a y la enfermedad vascular pulmonar.</p>       <p>Se ha reconocido que en la transposici&oacute;n de grandes arterias despu&eacute;s del switch atrial o arterial puede persistir enfermedad vascular pulmonar o presentarse de manera tard&iacute;a, raz&oacute;n por la cual, debido a su frecuencia creciente, hemos especificado esta condici&oacute;n en la clasificaci&oacute;n (53-55).</p>       ]]></body>
<body><![CDATA[<p>El s&iacute;ndrome de Eisenmenger cl&aacute;sico es una complicaci&oacute;n bien reconocida como un desorden multisist&eacute;mico; sin embargo, la diferenciaci&oacute;n entre complejo y simple cl&iacute;nicamente es muy importante tanto para la supervivencia como para el nivel funcional (56). Algunos estudios han sugerido que los ni&ntilde;os con s&iacute;ndrome de Eisenmenger pueden tener un deterioro m&aacute;s r&aacute;pido que los adultos (57) y hay preocupaci&oacute;n creciente porque los ni&ntilde;os con cortocircuitos corregidos con hipertensi&oacute;n pulmonar persistente o recurrente tienen una peor evoluci&oacute;n que los pacientes con s&iacute;ndrome de Eisenmenger o hipertensi&oacute;n pulmonar idiop&aacute;tica (47). Es probable que este &uacute;ltimo subgrupo requiera mayor estudio en el futuro.</p>       <p>La categor&iacute;a titulada hipertensi&oacute;n venosa pulmonar incluye adem&aacute;s las cardiomiopat&iacute;as tanto adquiridas como cong&eacute;nitas (58-59).</p>       <p>&bull;	Enfermedad vascular pulmonar que se presenta posterior a la cirug&iacute;a por estadios para el coraz&oacute;n univentricular: es amplio el uso de agentes espec&iacute;ficos para el tratamiento de ni&ntilde;os y adultos con hipertensi&oacute;n pulmonar que han tenido cirug&iacute;a de Glenn o Fontan. Los datos preliminares del registro espa&ntilde;ol sugieren que 14% de los ni&ntilde;os que reciben sildenafil o bosent&aacute;n tienen una lesi&oacute;n tipo coraz&oacute;n univentricular. La interacci&oacute;n de las circulaciones pulmonar y sist&eacute;mica cuando la energ&iacute;a cin&eacute;tica para el flujo sangu&iacute;neo a trav&eacute;s de ambas circulaciones se deriva de una masa ventricular &uacute;nica (y sin un ventr&iacute;culo subpulmonar) es compleja y la resistencia vascular pulmonar cumple un papel fisiol&oacute;gico importante (60-62). Estudios resientes sugieren que la intolerancia al ejercicio (63-64) e incluso la bronquitis pl&aacute;stica y la enteropat&iacute;a perdedora de prote&iacute;na (67) pueden deberse en parte a una resistencia vascular pulmonar aumentada (61-68).</p>       <p>&bull;	Exposici&oacute;n a la hipoxia hipob&aacute;rica y cardiopat&iacute;a cong&eacute;nita: hemos incluido las cardiopat&iacute;as cong&eacute;nitas en la altura bajo la categor&iacute;a 9 porque la altura puede afectar tanto la incidencia como la anatom&iacute;a del ductus arteriosus (69). Esto hace referencia tambi&eacute;n a los ni&ntilde;os con trisom&iacute;a 21 que nacen en la altura; adem&aacute;s, el test de reactividad vascular pulmonar (incluyendo el test de hiperoxia prolongada) y los criterios de manejo, son diferentes en la altura en relaci&oacute;n con los usados a nivel del mar (4-44, 45-69-72).</p>       <P>Categor&iacute;a 4</P>       <p><b>Displasia broncopulmonar </b></p>       <p>La displasia broncopulmonar (Tabla 2) es la secuela m&aacute;s frecuente en el reci&eacute;n nacido pret&eacute;rmino, que da origen a problemas cardiopulmonares persistentes en la ni&ntilde;ez, lo cual se ha ido incrementando como un problema significativo en la edad adulta (73, 74). Doce por ciento de los nacimientos son prematuros, lo que implica un riesgo de displasia broncopulmonar o enfermedad pulmonar cr&oacute;nica relacionada con la prematurez. La displasia broncopulmonar es un desorden complejo y mucho m&aacute;s que una enfermedad parenquimatosa pulmonar cr&oacute;nica secundaria a las estrategias de ventilaci&oacute;n. Aunque ha cambiado en las &uacute;ltimas d&eacute;cadas, la displasia broncopulmonar se caracteriza por una detenci&oacute;n en el desarrollo alveolar y vascular pulmonar (75-78) que con frecuencia tiene or&iacute;genes prenatales (15); por lo tanto, un paciente con displasia broncopulmonar puede tener hipertensi&oacute;n pulmonar debido a una disminuci&oacute;n en el crecimiento vascular pulmonar, agravado por hipoxia intermitente o cr&oacute;nica, hipercarbia por lesi&oacute;n del pulm&oacute;n y de la v&iacute;a a&eacute;rea, cortocircuito sist&eacute;mico pulmonar, disfunci&oacute;n cardiaca diast&oacute;lica y estenosis de venas pulmonares (79-83) (<a href="#figura2">Figura 2</a>).</p>       <P>Categor&iacute;a 5</P>       <p><b>Enfermedad vascular pulmonar hipertensiva pedi&aacute;trica aislada o hipertensi&oacute;n arterial pulmonar pedi&aacute;trica aislada</b></p>       <p>La categor&iacute;a correspondiente a enfermedad vascular pulmonar hipertensiva aislada o hipertensi&oacute;n arterial pulmonar aislada (Tabla 2) se asemeja mucho a la clasificaci&oacute;n de Dana Point (84-86). Sin embargo, sugerimos que el t&eacute;rmino &quot;idiop&aacute;tica&quot; se reserve para aquellos casos con verdadera hipertensi&oacute;n pulmonar &quot;idiop&aacute;tica&quot;; es decir, no asociada con alguna alteraci&oacute;n gen&eacute;tica, cromos&oacute;mica, entre otras. En pediatr&iacute;a son comunes las dificultades con cualquier sistema de clasificaci&oacute;n, si la hipertensi&oacute;n arterial pulmonar &quot;idiop&aacute;tica&quot; se diagnostica junto con un defecto gen&eacute;tico o con un s&iacute;ndrome cromos&oacute;mico (6).</p>       ]]></body>
<body><![CDATA[<p>Algunas drogas se&ntilde;aladas como causa de hipertensi&oacute;n pulmonar en ni&ntilde;os, son diferentes o menos validadas que las descritas en adultos (porque se usan infrecuentemente en Pediatr&iacute;a) (87-92).</p>       <P>Categor&iacute;a 6</P>       <p><b>Causas multifactoriales de hipertensi&oacute;n pulmonar asociadas con malformaciones cong&eacute;nitas</b></p>       <p>Cada d&iacute;a se reconoce m&aacute;s, que ni&ntilde;os que nacen con malformaciones cong&eacute;nitas (Tabla 2) con frecuencia sufren enfermedad vascular pulmonar debido a varios factores que contribuyen a su desarrollo, como ocurre con la Asociaci&oacute;n VACTERL y los s&iacute;ndromes de Charge, Down y Di George (23, 93-106). Adem&aacute;s, vale la pena se&ntilde;alar que en pacientes con s&iacute;ndromes gen&eacute;ticos, la enfermedad vascular pulmonar secundaria a cortocircuitos puede progresar en forma m&aacute;s acelerada (107).</p>       <P>Categor&iacute;a 7</P>       <p><b>Enfermedad pulmonar pedi&aacute;trica</b></p>       <p>En ni&ntilde;os cada d&iacute;a se reconoce con m&aacute;s frecuencia la coexistencia de ciertas enfermedades pulmonares con hipoplasia pulmonar (Tabla 2). La clasificaci&oacute;n de la enfermedad pulmonar intersticial tambi&eacute;n sugiere que la hipoplasia pulmonar y la detenci&oacute;n del crecimiento son una caracter&iacute;stica com&uacute;n en un n&uacute;mero de enfermedades pulmonares intersticiales en la ni&ntilde;ez (18) y la hipertensi&oacute;n pulmonar tiene un profundo impacto sobre su pron&oacute;stico (18). Tambi&eacute;n se reconocen las causas gen&eacute;ticas de la enfermedad pulmonar y pueden tener impacto sobre la vasculatura pulmonar prenatal (33, 34, 108, 109).</p>       <P>Categor&iacute;a 8</P>       <p><b>Enfermedad tromboemb&oacute;lica pulmonar</b></p>       <p>La incidencia de hipertensi&oacute;n pulmonar secundaria a enfermedad tromboemb&oacute;lica es m&aacute;s baja en los ni&ntilde;os en comparaci&oacute;n con los adultos, y en general, las enfermedades predisponentes o asociadas con tromboembolismo pulmonar tambi&eacute;n son diferentes en los ni&ntilde;os (110-115). Aunque las opciones quir&uacute;rgicas para el tratamiento de la hipertensi&oacute;n pulmonar tromboemb&oacute;lica cr&oacute;nica se han explorado menos en los ni&ntilde;os, el &eacute;xito logrado con estos procedimientos en los adultos estimula la consideraci&oacute;n de esta opci&oacute;n en ciertos casos en la poblaci&oacute;n pedi&aacute;trica (Tabla 2) (116-117).</p>       ]]></body>
<body><![CDATA[<P>Categor&iacute;a 9</P>       <p><b>Exposici&oacute;n a la hipoxia hipob&aacute;rica en edad pedi&aacute;trica</b></p>       <p>Los miembros del Task Force con amplia experiencia cl&iacute;nica trabajando en la altura, consideraron que la exposici&oacute;n a la hipoxia hipob&aacute;rica o la hipertensi&oacute;n pulmonar relacionada con la altura, es suficientemente diferente de otras formas de hipertensi&oacute;n arterial pulmonar y que justificaba la inclusi&oacute;n de &eacute;sta como una categor&iacute;a separada (Tabla 2). Estas diferencias incluyen la hipoxia en ausencia de enfermedad parenquimatosa pulmonar, diferentes aspectos gen&eacute;ticos y distintas estrategias de tratamiento (4, 44-46, 70, 72, 118-126).</p>       <P>Categor&iacute;a 10</P>       <p><b>Enfermedad vascular pulmonar hipertensiva asociada con des&oacute;rdenes de otros sistemas</b></p>       <p>En la tabla 2 se se&ntilde;alan los des&oacute;rdenes que pueden complicarse por o asociarse con hipertensi&oacute;n pulmonar (100, 127, 148-155). Llamamos la atenci&oacute;n sobre aspectos espec&iacute;ficos de la enfermedad pedi&aacute;trica como la hipertensi&oacute;n portal extrahep&aacute;tica secundaria a trombosis de la vena porta asociada a la colocaci&oacute;n de l&iacute;neas umbilicales y que puede no diagnosticarse porque las pruebas de funci&oacute;n hep&aacute;ticas son normales.</p>       <P>Conclusi&oacute;n</P>       <p>Proponemos una extensa clasificaci&oacute;n de la hipertensi&oacute;n pulmonar pedi&aacute;trica que incluye des&oacute;rdenes vasculares pulmonares hipertensivos que pueden presentarse en el neonato hasta el adolescente. Hacemos &eacute;nfasis en la importancia de factores prenatales y perinatales, incluyendo las alteraciones del desarrollo y la hipoplasia pulmonar los cuales pueden contribuir al desarrollo de enfermedad vascular pulmonar. Sugerimos que la enfermedad vascular pulmonar hipertensiva en pediatr&iacute;a, sea definida como una presi&oacute;n arterial pulmonar media mayor de 25 mm Hg y un &iacute;ndice de resistencia vascular pulmonar mayor de 3.0 U/Wood/m2 para las circulaciones biventriculares y, un &iacute;ndice de resistencia vascular pulmonar mayor de 3.0 U/Wood/m2 o un gradiente transpulmonar mayor de 6 mm Hg para las derivaciones cavopulmonares, incluso si la presi&oacute;n arterial pulmonar media es menor de 25 mm Hg.</p>       <p>Hemos clasificado la enfermedad vascular pulmonar hipertensiva en diez categor&iacute;as y esta clasificaci&oacute;n que proponemos se basa principalmente en la pr&aacute;ctica cl&iacute;nica. Los objetivos espec&iacute;ficos son: mejorar el enfoque diagn&oacute;stico, promover la investigaci&oacute;n cl&iacute;nica y el conocimiento de la patog&eacute;nesis, fisiolog&iacute;a y epidemiolog&iacute;a y que sirva de gu&iacute;a para el desarrollo de modelos de la enfermedad humana en el laboratorio y en la experimentaci&oacute;n animal. Esperamos al menos que esta clasificaci&oacute;n sirva como catalizador para lograr finalmente unos mejores resultados en nuestros pacientes. Si hay omisiones o se considera que debe hacerse cambios para mejorarla, se pide a los lectores interesados nos lo hagan saber a trav&eacute;s de la p&aacute;gina web del PVRI: <a href="http//pvri.info/home" target="_blank">http//pvri.info/home</a>.</p>       <P>Bibliograf&iacute;a</P>       ]]></body>
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