<?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>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422012000600004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tetralogía de Fallot: reporte de un caso y revisión de la literatura]]></article-title>
<article-title xml:lang="en"><![CDATA[Tetralogy of Fallot: Case report and literature review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Telich-Tarriba]]></surname>
<given-names><![CDATA[José Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ocampo]]></surname>
<given-names><![CDATA[Alekos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Cordero]]></surname>
<given-names><![CDATA[Sofía]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez-Orozco]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alexánderson]]></surname>
<given-names><![CDATA[Erick]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Panamericana  ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez  ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</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>55</volume>
<numero>6</numero>
<fpage>21</fpage>
<lpage>25</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422012000600004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422012000600004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422012000600004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La tetralogía de Fallot es una cardiopatía congénita que se caracteriza por presentar estenosis infundibular de la arteria pulmonar, cabalgamiento aórtico, comunicación interventricular e hipertrofia del ventrículo derecho. Es la cardiopatía congénita cianógena más prevalente, representando entre el 3.5 a 8% de los defectos cardiacos congénitos. Presentamos el caso de un paciente de 6 años que acudió al hospital con cianosis peribucal y acrocianosis y episodios recurrentes de crisis hipóxicas. Se le hizo un ecocardiograma con el cual se diagnóstico tetralogía de Fallot y posteriormente se le realizó una fístula de Blalock-Taussig.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Tetralogy of Fallot is a congenital cardiopathy characterized by infundiblutar stenosis of the pulmonary artery, overriding aorta, ventricular septal defect and right ventricular hypertrophy. It is the most prevalent cyanotic congenital heart defect, with a prevalence between 3.5 to 8%. We present the case of a 6-year-old male who was taken to our hospital due to perioral and distal cyanosis and paroxistic episodes of hypoxia (tet spell), who was diagnosed with tetralogy of Fallot after echocardiography and was treated with Blalock-Taussig shunt.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tetralogía de Fallot]]></kwd>
<kwd lng="es"><![CDATA[cardiopatías congénitas]]></kwd>
<kwd lng="es"><![CDATA[pediatría]]></kwd>
<kwd lng="en"><![CDATA[Tetralogy of Fallot]]></kwd>
<kwd lng="en"><![CDATA[congenital heart defects]]></kwd>
<kwd lng="en"><![CDATA[pediatrics]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos de revisi&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Tetralog&iacute;a de Fallot: reporte de un caso y revisi&oacute;n de la literatura</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Tetralogy of Fallot: Case report and literature review</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Jos&eacute; Eduardo Telich&#150;Tarriba<sup>a,b</sup>, Alekos Ocampo&ordf;, Sof&iacute;a L&oacute;pez&#150;Cordero&ordf;, Juan Jos&eacute; Rodr&iacute;guez&ordf;, Luis Ju&aacute;rez&#150;Orozco<sup>b,c</sup>, Erick Alex&aacute;nderson<sup>b,c</sup></b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>a</i></sup> <i>Escuela de Medicina, Universidad Panamericana, M&eacute;xico, D.F.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Departamento de Cardiolog&iacute;a Nuclear, Instituto Nacional de Cardiolog&iacute;a "Ignacio Ch&aacute;vez", SSA, M&eacute;xico, D.F.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Unidad PET/CT&#150;Ciclotr&oacute;n, Facultad de Medicina, Universidad Nacional Aut&oacute;noma de M&eacute;xico, M&eacute;xico, D.F. Correo electr&oacute;nico: </i><a href="mailto:alexanderick@yahoo.com">alexanderick@yahoo.com</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La tetralog&iacute;a de Fallot es una cardiopat&iacute;a cong&eacute;nita que se caracteriza por presentar estenosis infundibular de la arteria pulmonar, cabalgamiento a&oacute;rtico, comunicaci&oacute;n interventricular e hipertrofia del ventr&iacute;culo derecho. Es la cardiopat&iacute;a cong&eacute;nita cian&oacute;gena m&aacute;s prevalente, representando entre el 3.5 a 8% de los defectos cardiacos cong&eacute;nitos. Presentamos el caso de un paciente de 6 a&ntilde;os que acudi&oacute; al hospital con cianosis peribucal y acrocianosis y episodios recurrentes de crisis hip&oacute;xicas. Se le hizo un ecocardiograma con el cual se diagn&oacute;stico tetralog&iacute;a de Fallot y posteriormente se le realiz&oacute; una f&iacute;stula de Blalock&#150;Taussig.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Tetralog&iacute;a de Fallot, cardiopat&iacute;as cong&eacute;nitas, pediatr&iacute;a.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Tetralogy of Fallot is a congenital cardiopathy characterized by infundiblutar stenosis of the pulmonary artery, overriding aorta, ventricular septal defect and right ventricular hypertrophy. It is the most prevalent cyanotic congenital heart defect, with a prevalence between 3.5 to 8%. We present the case of a 6&#150;year&#150;old male who was taken to our hospital due to perioral and distal cyanosis and paroxistic episodes of hypoxia (tet spell), who was diagnosed with tetralogy of Fallot after echocardiography and was treated with Blalock&#150;Taussig shunt.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords<i>:</i></b> Tetralogy of Fallot, congenital heart defects, pediatrics.</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>CASO CL&Iacute;NICO</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Var&oacute;n de 6 a&ntilde;os que fue llevado a sala de urgencias por su madre, quien refiri&oacute; que present&oacute; cianosis peribucal y en extremidades, acompa&ntilde;ada de disnea de medianos esfuerzos. Cuenta con el antecedente de 4 crisis similares en el transcurso del &uacute;ltimo a&ntilde;o, que mejoran cuando el paciente se coloca en cuclillas.</font></p>  	    <p align="justify"><font face="verdana" size="2">Inici&oacute; con el padecimiento desde el nacimiento, con cuadros recurrentes de cianosis peribucal y diaforesis durante la alimentaci&oacute;n. Se detect&oacute; un soplo al a&ntilde;o de edad, el cual fue diagnosticado como funcional y no recibi&oacute; seguimiento m&eacute;dico. La madre refiere que en los &uacute;ltimos 3 meses el paciente hab&iacute;a tenido deterioro de clase funcional y aumento de la cianosis.</font></p>  	    <p align="justify"><font face="verdana" size="2">A la exploraci&oacute;n f&iacute;sica se encontr&oacute; retraso en el desarrollo f&iacute;sico, saturaci&oacute;n de ox&iacute;geno a 73% con aire ambiente, resto de signos vitales normales, cianosis peribucal y acrocianosis evidentes, sin acropaquia. A la auscultaci&oacute;n se escucha un soplo expulsivo mesosist&oacute;lico creciente en regi&oacute;n paraesternal alta acompa&ntilde;ado por fr&eacute;mito y segundo ruido de intensidad aumentada.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las pruebas de laboratorio muestran hemoglobina de 17.3 g/dL y policitemia. El EKG revela desviaci&oacute;n del eje QRS hacia la derecha, mientras que en la radiograf&iacute;a de t&oacute;rax se aprecia levantamiento del &aacute;pex a expensas de crecimiento de cavidades derechas y disminuci&oacute;n del calibre de la arteria pulmonar, dando una imagen de <i>"</i>coraz&oacute;n en forma de bota<i>"</i> <b>(<a href="#f1">figura 1</a>).</b></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/facmed/v55n6//a4f1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Se procedi&oacute; a realizar un ecocardiograma, en el que se encontr&oacute; hipoplasia del anillo pulmonar, estenosis pulmonar mixta de predominio valvular, comunicaci&oacute;n interventricular subarterial de 6.7 x 8.8 mm, ventr&iacute;culo derecho hipertr&oacute;fico, rama derecha de la arteria pulmonar hipopl&aacute;sica, cabalgamiento a&oacute;rtico del 40% y FEVI de 73% <b>(<a href="#f2">figura 2</a>).</b> Se realiz&oacute; tambi&eacute;n tomografia computada, en la cual se corrobor&oacute; la estenosis pulmonar y se observ&oacute; dilataci&oacute;n de la aorta ascendente, persistencia de vena cava superior izquierda y disminuci&oacute;n en el di&aacute;metro de la rama pulmonar derecha <b>(<a href="#f3">figura 3</a>).</b></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>  	    ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/facmed/v55n6//a4f2.jpg"></font></p> 	    <p align="center"><a name="f3"></a></p> 	    <p align="center"><img src="/img/revistas/facmed/v55n6//a4f3.jpg"></p>      <p align="justify"><font face="verdana" size="2">Con estos hallazgos se lleg&oacute; al diagn&oacute;stico de tetralog&iacute;a de Fallot. Debido a la hipoplasia de la arteria pulmonar derecha se realiz&oacute; una fistula de Blalock Taussig con Goretex de 6 mm, con aumento de la saturaci&oacute;n de ox&iacute;geno hasta del 90%. El paciente fue dado de alta, con indicaci&oacute;n de seguimiento en la consulta externa para programaci&oacute;n de cirug&iacute;a correctiva.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>DISCUSI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La tetralog&iacute;a de Fallot (TF) representa entre 3.5 y 8% de los defectos cardiacos cong&eacute;nitos, y afecta aproximadamente a 1 de cada 2400 nacidos vivos<sup>1,2</sup>. Se trata de un complejo de alteraciones en la arquitectura cardiaca que consta t&iacute;picamente de 4 componentes: aorta cabalgada, estenosis pulmonar, comunicaci&oacute;n interventricular e hipertrofia de ventr&iacute;culo derecho.</font></p>  	    <p align="justify"><font face="verdana" size="2">Estas malformaciones son debidas a un defecto de la tabicaci&oacute;n troncoconal, en la cual el tabique responsable de la separaci&oacute;n entre el canal a&oacute;rtico del canal pulmonar se desarrolla en el territorio correspondiente al canal pulmonar, originando una comunicaci&oacute;n interventricular en la regi&oacute;n perimembranosa que puede llegar a extenderse hasta el septum membranoso; el defecto en la tabicaci&oacute;n condiciona el cabalgamiento a&oacute;rtico, comunicando a la aorta con ambos ventr&iacute;culos<sup>3</sup>; el desarrollo an&oacute;malo del septum interventricular ocasionar&aacute; una estenosis del infund&iacute;bulo y generando una estenosis subvalvular, adem&aacute;s el anillo valvular suele ser hipopl&aacute;sico, aunque en algunos casos puede ser de normal tama&ntilde;o y finalmente la v&aacute;lvula pulmonar suele ser bic&uacute;spide y esten&oacute;tica, condicionando el desarrollo de hipertrofia ventricular derecha<sup>4,5</sup>. A pesar de no existir un defecto gen&eacute;tico que condicione el desarrollo de TF se ha visto relacionado a algunos s&iacute;ndromes como deleciones en 22q11.2, o asociaciones como CHARGE y VACTERL<sup>6&#150;8</sup>. Otros factores relacionados con su aparici&oacute;n son la fenilcetonuria, ingesta de &aacute;cido retin&oacute;ico y trimetadiona durante la gestaci&oacute;n<sup>9</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La cl&iacute;nica del paciente depender&aacute; del grado de obstrucci&oacute;n del tracto de salida del ventr&iacute;culo derecho. El paso de sangre depender&aacute; de las resistencias vasculares pulmonares m&aacute;s que del tama&ntilde;o de los ventr&iacute;culos; por tanto, si la resistencia de salida de ventr&iacute;culo derecho es menor que la de ventr&iacute;culo izquierdo hacia la aorta, el cortocircuito ser&aacute; de izquierda a derecha y el paciente se encontrar&aacute; predominantemente acian&oacute;tico<sup>10</sup>. Sin embargo, cuando la resistencia es mayor en el ventr&iacute;culo derecho el cortocircuito ser&aacute; de derecha a izquierda, y el paciente se presentar&aacute; con la cl&iacute;nica cl&aacute;sica de cianosis y disnea de esfuerzo que mejora con posici&oacute;n en cuclillas<sup>11</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Otras manifestaciones cl&iacute;nicas son el retraso en el desarrollo tanto f&iacute;sico y psicomotor<sup>12</sup>, adem&aacute;s de manifestaciones de hipoxia cr&oacute;nica, como la acropaquia<sup>5</sup>. El estado de hipoxia cr&oacute;nica condiciona al desarrollo de policitemia, aumentando as&iacute; adem&aacute;s la viscosidad sangu&iacute;nea y aumentando el riesgo de desarrollo de trombosis en diversos &oacute;rganos<sup>13</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Las crisis hip&oacute;xicas son paroxismos similares a los que present&oacute; nuestro paciente al llegar al hospital: episodios de disnea grave y cianosis desarrollados en periodos de alta demanda de ox&iacute;geno, como el ejercicio. La fisiopatolog&iacute;a de estas crisis yace en la activaci&oacute;n de un reflejo por incremento de la contractilidad del ventr&iacute;culo derecho que provoca liberaci&oacute;n de catecolaminas con hiperventilaci&oacute;n, vasodilataci&oacute;n perif&eacute;rica y bradicardia, lo que precipita los episodios<sup>14,15</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El diagn&oacute;stico de TF es eminentemente cl&iacute;nico, clasific&aacute;ndose ya sea en cian&oacute;tica o acian&oacute;tica dependiendo del grado de estenosis pulmonar. A la exploraci&oacute;n f&iacute;sica es relevante la auscultaci&oacute;n, caracteriz&aacute;ndose por la presencia de un soplo sist&oacute;lico expulsivo en la regi&oacute;n paraesternal superior izquierda<sup>3</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El apoyo en estudios de imagen permite corroborar el diagn&oacute;stico y estadificar la gravedad de la enfermedad. Nuestro paciente present&oacute; los hallazgos relevantes en la radiograf&iacute;a de t&oacute;rax, con un coraz&oacute;n con silueta en de zueco o bota, por levantamiento de punta de VD<sup>16</sup>. En el EKG se encuentran t&iacute;picamente datos de crecimiento de cavidades derechas y desviaci&oacute;n del eje QRS a la derecha. El ecocardiograma es el m&eacute;todo de imagen m&aacute;s &uacute;til para confirmar el diagn&oacute;stico, al permitir observar los datos de comunicaci&oacute;n interventricular, crecimiento de cavidades, estenosis pulmonar y aorta cabalgada. Se han obtenido buenos resultados diagn&oacute;sticos con el uso de ecocardiograf&iacute;a en etapa fetal, permitiendo obtener datos de alteraciones cardiacas y anomal&iacute;as asociadas en el feto, adem&aacute;s de aportar datos &uacute;tiles para valoraci&oacute;n prequir&uacute;rgica<sup>17</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El cateterismo permite determinar la importancia de las alteraciones hemodin&aacute;micas y la presencia de salto oxim&eacute;trico al pasar de la aur&iacute;cula derecha al ventr&iacute;culo derecho si las presiones derechas no han vencido a&uacute;n las izquierdas<sup>18</sup>. El uso de la tomograf&iacute;a computada y la resonancia magn&eacute;tica, a pesar de no aportar datos adicionales en cuanto a la morfolog&iacute;a cardiaca respecta, pueden ser &uacute;tiles para descubrir la presencia de alteraciones morfol&oacute;gicas o funcionales en general, ilustrado en nuestro caso por la confirmaci&oacute;n de la hipoplasia de la arteria pulmonar derecha y el descubrimiento de una vena cava supernumeraria<sup>19,20</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El tratamiento de TF es quir&uacute;rgico. Consiste en 2 entidades: una paliativa y otra correctiva. La cirug&iacute;a correctiva involucra el cierre de la comunicaci&oacute;n interventricular, correcci&oacute;n del cabalgamiento a&oacute;rtico y reparaci&oacute;n de la obstrucci&oacute;n del tracto de salida del ventr&iacute;culo derecho<sup>21</sup>. Las cirug&iacute;a paliativa se utiliza generalmente en presencia de contraindicaciones para el procedimiento correctivo permanente y se utiliza m&aacute;s com&uacute;nmente la t&eacute;cnica de Blalock&#150;Taussig, que consiste en un cortocircuito entre la arteria subclavia y la pulmonar, mediante una anastomosis y un injerto de Gorotex con el objetivo de restablecer el flujo sangu&iacute;neo al lecho pulmonar<sup>22,23</sup>. No se han encontrado beneficios en retrasar el procedimiento m&aacute;s all&aacute; del a&ntilde;o de edad<sup>24</sup>, sin embargo, se ha observado que el tiempo que el paciente transcurre sin tratamiento no tiene influencia en el &eacute;xito del procedimiento<sup>25.</sup> Las complicaciones principales de la cirug&iacute;a correctiva son las insuficiencias valvulares y arritmias, especialmente ventriculares<sup>26&#150;28</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El pron&oacute;stico de los pacientes sin correcci&oacute;n quir&uacute;rgica es poco alentador, con una sobrevida al a&ntilde;o de 66%, y a los 10 a&ntilde;os de 24%<sup>29</sup>. Con la cirug&iacute;a paliativa &eacute;sta aumenta hasta el 90%, y es cercana al 97% en pacientes que son atendidos de forma directa con cirug&iacute;a correctiva<sup>26</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En lo que respecta al estilo de vida, los pacientes corregidos de tetralog&iacute;a de Fallot obtienen buenos resultados en pruebas que eval&uacute;an su estilo de vida y educaci&oacute;n, siendo casi similares a sus controles. Las mujeres con tetralog&iacute;a de Fallot corregida tienen mayor riesgo de tener un hijo con alguna cardiopat&iacute;a troncoconal que las mujeres sin &eacute;sta, pero no acarrea riesgo alguno durante el embarazo<sup>30</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Al ser la TF una enfermedad con cl&iacute;nica muy rica y abundante, el cl&iacute;nico deber&aacute; tener el diagn&oacute;stico en mente cuando se observan en un paciente datos caracter&iacute;sticos al interrogatorio o exploraci&oacute;n f&iacute;sica. Es importante la detecci&oacute;n y tratamiento tempranos del paciente, debido a que su retraso conlleva a repercusiones importantes. La gran prevalencia de la enfermedad obliga entonces al m&eacute;dico general a conocer su perfil y datos clave para su diagn&oacute;stico desde la evaluaci&oacute;n temprana del infante con el objetivo de reducir al m&aacute;ximo posible la aparici&oacute;n de complicaciones futuras.</font></p>  	    ]]></body>
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