<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462014000300003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Disfunción diastólica subclínica del ventrículo izquierdo en adolescentes con diabetes tipo 1]]></article-title>
<article-title xml:lang="en"><![CDATA[Subclinical left ventricular diastolic dysfunction in adolescents with type 1 diabetes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Márquez]]></surname>
<given-names><![CDATA[Rocío]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peralta-Cortázar]]></surname>
<given-names><![CDATA[Catalina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-Rodríguez]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Rodríguez]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manjarrez-Gutiérrez]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional Siglo XXI Hospital de Pediatría]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional Siglo XXI Hospital de Cardiología]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados Departamento de Fisiología, Biofísica y Neurociencias]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional Siglo XXI Hospital de Cardiología]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<volume>71</volume>
<numero>3</numero>
<fpage>142</fpage>
<lpage>147</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462014000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462014000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462014000300003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: El objetivo de este trabajo fue determinar la prevalencia de disfunción diastólica subclínica del ventrículo izquierdo (DDVI) y su asociación con el descontrol metabólico en adolescentes con diabetes tipo 1. Métodos: Se trató de un estudio en 53 adolescentes con diabetes tipo 1 en dos fases: primero, un estudio transversal descriptivo y, después de realizar un ecocardiograma, un transversal comparativo. Se consideró DDVI cuando tuvieron tres o más datos ecocardiográficos alterados: velocidad de contracción auricular (relación E/A), tiempo de desaceleración (TD), tiempo de relajación volumétrico (TRIVI) y función sistólica mayor de 50%. Además, se les determinaron los niveles de glucosa, de hemoglobina glucosilada y microalbuminuria. Resultados: El 16.98% de los adolescentes diabéticos mostraron datos ecocardiográficos de DDVI, y el 15.10% correspondió al sexo masculino. El patrón pseudonormalizado se observó en 7.54%, en relación con el 5.66% del patrón de alteración de la relajación y del 3.77% del restrictivo. Estos pacientes, además, mostraron mayor tiempo de la enfermedad, obesidad y un aumento en la glucemia, en la hemoglobina glucosilada y de la microalbuminuria. Conclusiones: La DDVI es una complicación frecuente en los adolescentes con diabetes tipo 1. Aquellos con DDVI presentaron con mayor frecuencia obesidad, mayor tiempo de evolución de la enfermedad y un peor control metabólico. Se propone que en estos pacientes se realice un diagnóstico oportuno y sistemático a través de un ecocardiograma.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Background: To determine the prevalence of subclinical left ventricular diastolic dysfunction (LVDD) and its association with metabolic control in adolescents with type 1diabetes. Methods: We carried out a study in 53 adolescents with type 1 diabetes in two phases: cross-sectional and after performing two-dimensional M-mode echocardiogram and color Doppler, a cross-sectional comparison. Subjects were divided into two groups: the first without LVDD and the second with LVDD. LVDD was considered when there were three or more alterations according to echocardiographic data (rate of atrial contraction, time of deceleration, time of volumetric relaxation) accompanied by systolic function >50%. We also determined glucose, hemoglobin, glycosylate, and microalbuminuria. Results: Of the adolescents with diabetes, 16.98% showed echocardiographic data of LVDD; 15.10% were male. Pseudonormalized pattern was observed in 7.54% compared to 5.66% with impaired relaxation pattern and 3.77% with restrictive pattern. Furthermore, there was a longer time of disease evolution, obesity and a significant increase of glycemia, glycosylated hemoglobin and microalbuminuria. Conclusions: LVDD is a frequent complication in adolescents with type 1 diabetes. Those with LVDD had a higher prevalence of obesity, longer time of disease, and poorer metabolic control. Therefore, we propose that a timely and systematic search with echocardiogram is important in patients with type 1 diabetes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Diabetes tipo 1]]></kwd>
<kwd lng="es"><![CDATA[Disfunción ventricular izquierda subclínica]]></kwd>
<kwd lng="es"><![CDATA[Adolescentes]]></kwd>
<kwd lng="es"><![CDATA[Corazón]]></kwd>
<kwd lng="es"><![CDATA[Obesidad]]></kwd>
<kwd lng="es"><![CDATA[Ecocardiograma]]></kwd>
<kwd lng="en"><![CDATA[Type 1 diabetes]]></kwd>
<kwd lng="en"><![CDATA[Left ventricular diastolic dysfunction]]></kwd>
<kwd lng="en"><![CDATA[Adolescents]]></kwd>
<kwd lng="en"><![CDATA[Heart]]></kwd>
<kwd lng="en"><![CDATA[Obesity]]></kwd>
<kwd lng="en"><![CDATA[Echocardiogram]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culo de investigaci&oacute;n</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Disfunci&oacute;n diast&oacute;lica subcl&iacute;nica del ventr&iacute;culo izquierdo en adolescentes con diabetes tipo 1</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="3"><b>Subclinical left ventricular diastolic dysfunction in adolescents with type 1 diabetes</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Roc&iacute;o Herrera&#45;M&aacute;rquez<sup>a</sup>, Catalina Peralta&#45;Cort&aacute;zar<sup>a</sup>, Alicia Contreras&#45;Rodr&iacute;guez<sup>b</sup>, Jorge Hern&aacute;ndez&#45;Rodr&iacute;guez<sup>c</sup> y Gabriel Manjarrez&#45;Guti&eacute;rrez<sup>d,e,</sup>*</b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>a</i></sup><i> Divisi&oacute;n de Investigaci&oacute;n y Departamento de Endocrinolog&iacute;a, Hospital de Pediatr&iacute;a, Centro M&eacute;dico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, M&eacute;xico D.F., M&eacute;xico.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><i><font face="verdana" size="2"><sup>b</sup> Unidad de Gabinete s, Hospital de Cardiolog&iacute;a, Centro M&eacute;dico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, M&eacute;xico D.F., M&eacute;xico.</font></i></p>  	    <p align="justify"><i><font face="verdana" size="2"><sup>c</sup> Departamento de Fisiolog&iacute;a, Biof&iacute;sica y Neurociencias, Centro de Investigaci&oacute;n y de Estudios Avanzados, Instituto Polit&eacute;cnico Nacional, M&eacute;xico D.F., M&eacute;xico.</font></i></p>  	    <p align="justify"><i><font face="verdana" size="2"><sup>d</sup> Laboratorio de Patolog&iacute;a Molecular, Unidad de Investigaci&oacute;n Biomolecular, Hospital de Cardiolog&iacute;a, Centro M&eacute;dico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, M&eacute;xico D.F., M&eacute;xico.</font></i></p> 	    <p align="justify"><i><font face="verdana" size="2"><sup>e</sup> Unidad de Investigaci&oacute;n en Enfermedades Neurol&oacute;gicas, Hospital de Especialidades, Centro M&eacute;dico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, M&eacute;xico D.F., M&eacute;xico.</font></i></p>      <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>* Autor para correspondencia:</b>    <br>     <i>G. Manjarrez&#45;Guti&eacute;rrez.</i>    <br> 	Correos electr&oacute;nicos: <a href="mailto:willisga@prodigy.net.mx">willisga@prodigy.net.mx</a>, <a href="mailto:gmanjarrezg@gmail.com">gmanjarrezg@gmail.com</a></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 22 de octubre de 2013;    ]]></body>
<body><![CDATA[<br> 	aceptado el 11 de abril de 2014.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Introducci&oacute;n:</i> El objetivo de este trabajo fue determinar la prevalencia de disfunci&oacute;n diast&oacute;lica subcl&iacute;nica del ventr&iacute;culo izquierdo (DDVI) y su asociaci&oacute;n con el descontrol metab&oacute;lico en adolescentes con diabetes tipo 1.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>M&eacute;todos:</i> Se trat&oacute; de un estudio en 53 adolescentes con diabetes tipo 1 en dos fases: primero, un estudio transversal descriptivo y, despu&eacute;s de realizar un ecocardiograma, un transversal comparativo. Se consider&oacute; DDVI cuando tuvieron tres o m&aacute;s datos ecocardiogr&aacute;ficos alterados: velocidad de contracci&oacute;n auricular (relaci&oacute;n E/A), tiempo de desaceleraci&oacute;n (TD), tiempo de relajaci&oacute;n volum&eacute;trico (TRIVI) y funci&oacute;n sist&oacute;lica mayor de 50%. Adem&aacute;s, se les determinaron los niveles de glucosa, de hemoglobina glucosilada y microalbuminuria.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Resultados:</i> El 16.98% de los adolescentes diab&eacute;ticos mostraron datos ecocardiogr&aacute;ficos de DDVI, y el 15.10% correspondi&oacute; al sexo masculino. El patr&oacute;n pseudonormalizado se observ&oacute; en 7.54%, en relaci&oacute;n con el 5.66% del patr&oacute;n de alteraci&oacute;n de la relajaci&oacute;n y del 3.77% del restrictivo. Estos pacientes, adem&aacute;s, mostraron mayor tiempo de la enfermedad, obesidad y un aumento en la glucemia, en la hemoglobina glucosilada y de la microalbuminuria.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Conclusiones:</i> La DDVI es una complicaci&oacute;n frecuente en los adolescentes con diabetes tipo 1. Aquellos con DDVI presentaron con mayor frecuencia obesidad, mayor tiempo de evoluci&oacute;n de la enfermedad y un peor control metab&oacute;lico. Se propone que en estos pacientes se realice un diagn&oacute;stico oportuno y sistem&aacute;tico a trav&eacute;s de un ecocardiograma.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave</b>: Diabetes tipo 1; Disfunci&oacute;n ventricular izquierda subcl&iacute;nica; Adolescentes; Coraz&oacute;n; Obesidad; Ecocardiograma.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>Background:</i> To determine the prevalence of subclinical left ventricular diastolic dysfunction (LVDD) and its association with metabolic control in adolescents with type 1diabetes.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Methods:</i> We carried out a study in 53 adolescents with type 1 diabetes in two phases: cross&#45;sectional and after performing two&#45;dimensional M&#45;mode echocardiogram and color Doppler, a cross&#45;sectional comparison. Subjects were divided into two groups: the first without LVDD and the second with LVDD. LVDD was considered when there were three or more alterations according to echocardiographic data (rate of atrial contraction, time of deceleration, time of volumetric relaxation) accompanied by systolic function &gt;50%. We also determined glucose, hemoglobin, glycosylate, and microalbuminuria.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Results:</i> Of the adolescents with diabetes, 16.98% showed echocardiographic data of LVDD; 15.10% were male. Pseudonormalized pattern was observed in 7.54% compared to 5.66% with impaired relaxation pattern and 3.77% with restrictive pattern. Furthermore, there was a longer time of disease evolution, obesity and a significant increase of glycemia, glycosylated hemoglobin and microalbuminuria.</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Conclusions:</i> LVDD is a frequent complication in adolescents with type 1 diabetes. Those with LVDD had a higher prevalence of obesity, longer time of disease, and poorer metabolic control. Therefore, we propose that a timely and systematic search with echocardiogram is important in patients with type 1 diabetes.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Type 1 diabetes; Left ventricular diastolic dysfunction; Adolescents; Heart; Obesity; Echocardiogram.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>1. Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las enfermedades cardiovasculares constituyen una de las principales causas de morbilidad y mortalidad en los pacientes con diabetes tipo 1 y tipo 2. La enfermedad arterial coronaria es la complicaci&oacute;n m&aacute;s com&uacute;n y representa m&aacute;s del 50% de las muertes en los pacientes diab&eacute;ticos tipo 2 y casi el 25% en los diab&eacute;ticos del tipo 1<sup>1</sup>. Se conoce que a mayor descontrol metab&oacute;lico, mayor la incidencia de complicaciones cardiovasculares<sup>2&#45;6</sup>. En el estudio de Framingham se report&oacute; que la presencia de diabetes aumenta de 2.5 a 5 veces m&aacute;s el riesgo de desarrollar insuficiencia cardiaca<sup>7&#45;9</sup>. Adem&aacute;s, se ha observado que los pacientes que tienen insuficiencia cardiaca y que desarrollan diabetes tienen un mal pron&oacute;stico para la funci&oacute;n y la vida.</font></p>  	    <p align="justify"><font face="verdana" size="2">En la actualidad, las lesiones del miocardio en los pacientes diab&eacute;ticos no asociados a aterosclerosis coronaria, ni a hipertensi&oacute;n arterial, se describen como enfermedad muscular cardiaca del diab&eacute;tico (EMCD), donde participan cambios en la microcirculaci&oacute;n, alteraciones metab&oacute;licas y, en fase tard&iacute;a, la neuropat&iacute;a auton&oacute;mica. Esto conlleva al dep&oacute;sito de fibras de col&aacute;gena en el intersticio cardiaco, hipertrofia de los miocardiocitos y dep&oacute;sitos de l&iacute;pidos<sup>10&#45;12</sup>. El resultado de todas estas alteraciones se refleja en el funcionamiento mioc&aacute;rdico, que inicia con una disfunci&oacute;n diast&oacute;lica subcl&iacute;nica del ventr&iacute;culo izquierdo (DDVI) y, en fases tard&iacute;as, presenta la disfunci&oacute;n sist&oacute;lica del mismo ventr&iacute;culo<sup>13&#45;15</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La DDVI en los adolescentes diab&eacute;ticos sin enfermedad cardiovascular previa puede considerarse como un marcador inicial de la EMCD. El m&eacute;todo m&aacute;s empleado para su diagn&oacute;stico es la ecocardiograf&iacute;a, debido a su mayor difusi&oacute;n, alta sensibilidad y ausencia de complicaciones<sup>16&#45;19</sup>. La ecocardiograf&iacute;a eval&uacute;a el flujo de llenado de la v&aacute;lvula mitral y en las venas pulmonares, y los tiempos y velocidad de relajaci&oacute;n de los anillos mitral y tricusp&iacute;deo. Actualmente permite el estudio de la funci&oacute;n diast&oacute;lica regional de los segmentos basales y medios del ventr&iacute;culo izquierdo (VI). Estos m&eacute;todos ecocardiogr&aacute;ficos han permitido demostrar diversas alteraciones de la funci&oacute;n diast&oacute;lica, que van desde un deterioro leve de la relajaci&oacute;n mioc&aacute;rdica hasta cambios restrictivos del llenado ventricular<sup>16&#45;19</sup>. As&iacute; pues, la DDVI se considera cuando existe un trastorno de la relajaci&oacute;n o distensi&oacute;n ventricular o ambos, con un aumento de las presiones del llenado ventricular izquierdo y de la presi&oacute;n capilar pulmonar, acompa&ntilde;ados de una funci&oacute;n sist&oacute;lica mayor del 50%<sup>16&#45;19</sup>. La funci&oacute;n sist&oacute;lica, a su vez, depende de la funci&oacute;n mec&aacute;nica del VI, del acoplamiento ventr&iacute;culo&#45;arterial y de la volemia. El acortamiento de las fibras longitudinales y circunferenciales condiciona un mayor engrosamiento de la pared ventricular, con un incremento en la expulsi&oacute;n del volumen sist&oacute;lico (VS). El 14% del acortamiento de las fibras mioc&aacute;rdicas producen aproximadamente el 40% de engrosamiento de la pared ventricular<sup>20</sup>. Actualmente se conoce que varios &iacute;ndices relacionados con el acortamiento (<i>strain</i> longitudinal global, torsi&oacute;n y <i>twist</i>) pueden estar alterados en presencia de la fracci&oacute;n de eyecci&oacute;n (FEVI) normal<sup>20&#45;23</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En M&eacute;xico, no se conoce la frecuencia de la DDVI en adolescentes con diabetes tipo 1, aunque en otros pa&iacute;ses se ha reportado que oscila entre 18 y 69%<sup>20&#45;23</sup>. Por lo tanto, el objetivo del presente estudio fue evaluar la prevalencia de DDVI por ecocardiograf&iacute;a y su asociaci&oacute;n con el descontrol metab&oacute;lico en los adolescentes con diabetes tipo 1 sin complicaciones cardiovasculares.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>2. M&eacute;todos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Este estudio fue aprobado por los comit&eacute;s de &eacute;tica y de investigaci&oacute;n del Hospital de Cardiolog&iacute;a, Centro M&eacute;dico Nacional Siglo XXI, del Instituto Mexicano del Seguro Social (registro R&#45;2011&#45;3604&#45;1), y se efectu&oacute; de acuerdo con la declaraci&oacute;n de Helsinki. Todos los padres de los pacientes dieron su consentimiento informado por escrito y todos los adolescentes firmaron una carta de asentimiento. Se efectu&oacute; un estudio en 53 adolescentes, de sexo masculino o femenino, con diabetes mellitus tipo 1, seg&uacute;n los criterios de la Asociaci&oacute;n Americana de Diabetes<sup>24</sup>. El estudio se llev&oacute; a cabo en dos fases: transversal descriptivo, para conocer la prevalencia de la DDVI, y transversal comparativo, para evaluar la asociaci&oacute;n entre la DDVI y el descontrol metab&oacute;lico.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los pacientes fueron seleccionados del servicio de Endocrinolog&iacute;a del Hospital de Pediatr&iacute;a, Centro M&eacute;dico Nacional Siglo XXI, Instituto Mexicano del Seguro Social. Se dividieron en dos grupos despu&eacute;s de haber efectuado un estudio de ecocardiograf&iacute;a en modo M, bidimensional y Doppler color: el primero, el que no present&oacute; datos ecocardiogr&aacute;ficos de DDVI. El segundo fue el que tuvo datos de DDVI, pero no presentaban complicaciones cardiovasculares ni otra patolog&iacute;a agregada y en el ecocardiograma tuvieron una funci&oacute;n sist&oacute;lica normal (criterios de inclusi&oacute;n). Los adolescentes diab&eacute;ticos con cardiopat&iacute;a cong&eacute;nita, hipertensi&oacute;n arterial, arterioesclerosis, infecci&oacute;n aguda o cr&oacute;nica, trastornos hidroelectrol&iacute;ticos, presencia de enfermedad hep&aacute;tica, ingesta de medicamentos, como antihistam&iacute;nicos, antitromb&oacute;ticos o antihipertensivos, no fueron considerados para el estudio (criterios de exclusi&oacute;n).</font></p>  	    <p align="justify"><font face="verdana" size="2">Todos los adolescentes se alimentaron con una dieta normal de 55 Kcal/kg/d&iacute;a (prote&iacute;nas 15%, carbohidratos 55%, l&iacute;pidos 30%). Adem&aacute;s, fueron tratados con una combinaci&oacute;n de insulina de acci&oacute;n r&aacute;pida e intermedia a raz&oacute;n de 1 a 1.5 U/kg/d&iacute;a. Entre las 07.00 y las 08.00 h y 12 h despu&eacute;s del &uacute;ltimo alimento, 3 ml de sangre fueron colectados por venopunci&oacute;n para determinar niveles de glucosa, hemoglobina glucosilada, colesterol, triglic&eacute;ridos, lipoprote&iacute;nas de alta densidad (HDL), lipoprote&iacute;nas de baja densidad (LDL) y microalbuminuria, Tambi&eacute;n se les efectu&oacute; un ecocardiograma transtor&aacute;cico en modo M, bidimensional y Doppler color, para evaluar la funci&oacute;n diast&oacute;lica del ventr&iacute;culo izquierdo.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>2.1. Ensayos bioqu&iacute;micos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La glucosa s&eacute;rica fue determinada por el m&eacute;todo de glucosa oxidasa (valores normales, 60&#45;100 mg/dl)<sup>25</sup>, la hemoglobina glucosilada por cromatograf&iacute;a de intercambio cati&oacute;nico (valores normales, 4.8 a 5.9%)<sup>26</sup>, y microalbuminuria (valor normal menor de 300 mg/24 h) por el m&eacute;todo de Doumas y colaboradores<sup>27</sup>. El colesterol, los triglic&eacute;ridos, las lipoprote&iacute;nas HDL y LDL&#45;colesterol fueron cuantificados a trav&eacute;s de un Kit Flex<sup>&reg;</sup> reagents cartridge (Dade Behring Inc, Newark, DE) que utiliza un m&eacute;todo enzim&aacute;tico colorim&eacute;trico.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>2.2. Estudio de ecocardiograf&iacute;a</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se realiz&oacute; el estudio Doppler, modo&#45;M y bidimensional, con un equipo de ecocardiograf&iacute;a (Philips modelo iE33) con un transductor de 3.5 MHz. Todos los estudios fueron efectuados y analizados por el mismo ecocardiografista. Las mediciones de los di&aacute;metros telediast&oacute;lico y telesist&oacute;lico del VI y la medici&oacute;n de la fracci&oacute;n de eyecci&oacute;n del VI (FEVI) se obtuvieron de acuerdo con los criterios de la Sociedad Americana de Ecocardiograf&iacute;a<sup>28</sup>. La masa ventricular se determin&oacute; mediante la f&oacute;rmula de Devereux. La hipertrofia ventricular se defini&oacute; como el &iacute;ndice de masa del VI superior a 110 g/m<sup>2</sup> en hombres y mayor de 100 g/m<sup>2</sup> en mujeres. El registro del flujo de llenado ventricular izquierdo se obtuvo a trav&eacute;s de la ventana apical por los m&eacute;todos descritos por la Asociaci&oacute;n de Ecocardiograf&iacute;a de la Sociedad Interamericana de Cardiolog&iacute;a<sup>26</sup>. Se obtuvieron las siguientes mediciones: velocidad del flujo diast&oacute;lico temprano (pico E), velocidad del flujo del pico diast&oacute;lico tard&iacute;o (pico A), su &iacute;ndice (E/A), tiempo de desaceleraci&oacute;n de la onda E (TD) y tiempo de relajaci&oacute;n isovolum&eacute;trica (TRIVI). La disfunci&oacute;n diast&oacute;lica se determin&oacute; en relaci&oacute;n con la presencia de tres patrones de llenado ventricular: tipo 1 (alteraciones en la relajaci&oacute;n con la presencia de una relaci&oacute;n E/A &le; 1, TD &ge; 250 mseg y TRIVI &ge; 150 mseg); tipo 2 (patr&oacute;n pseudo normalizado con una relaci&oacute;n E/A de 1 a 2, TD de 150 a 250 mseg y TRIVI &lt;150 mseg). Este patr&oacute;n se confirm&oacute; con la presencia de una velocidad de propagaci&oacute;n de color (Vp) menor de 50 mseg o una diferencia entre el tiempo de la duraci&oacute;n de la Ar y la duraci&oacute;n de la onda A mitral (Ar&#45;A). Con incrementos en la presi&oacute;n al final de di&aacute;stole ventricular izquierda (PFDVI), la velocidad de la Ar incrementa &gt;35 cm/seg y la duraci&oacute;n de la Ar se incrementan. El patr&oacute;n tipo 3 restrictivo, con una relaci&oacute;n E/A &gt;2, TD &lt;150 mseg y TRIVI acortado. Con una velocidad de la onda A reversa mayor de 35 cm/seg y duraci&oacute;n Am <sup>16&#45;19,28&#45;31.</sup> Todas estas im&aacute;genes se obtuvieron en 4, 3 y 2 c&aacute;maras en bidimensional y en eje corto paraesternal a nivel basal y apical, para ser analizados posteriormente con el programa de Q&#45;Lab. Se grabaron los estudios en el mismo equipo, los cuales a su vez fueron reevaluados por otro m&eacute;dico especializado en ecocardiograf&iacute;a (en forma cegada).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>2.3. An&aacute;lisis estad&iacute;sticos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se utiliz&oacute; estad&iacute;stica descriptiva para las variables demogr&aacute;ficas: porcentajes, medias y desviaciones est&aacute;ndar. Para los par&aacute;metros ecocardiogr&aacute;ficos se efectu&oacute; tambi&eacute;n estad&iacute;stica descriptiva. Las diferencias entre los valores promedio fueron analizadas por la prueba <i>t</i> de Student y el coeficiente de variaci&oacute;n de Levene, con un nivel de significaci&oacute;n de <i>p</i> &lt; 0.05.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>3. Resultados</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El aspecto m&aacute;s interesante del presente trabajo fue determinar la prevalencia de DDVI a trav&eacute;s de un ecocardiograma en adolescentes con diabetes tipo 1. De los 53 pacientes incluidos en el presente estudio, el 16.98% present&oacute; datos ecocardiogr&aacute;ficos compatibles con DDVI, 15.10% correspondi&oacute; al sexo masculino en relaci&oacute;n con el 1.88% que mostr&oacute; el sexo femenino. El patr&oacute;n de llenado pseudonormalizado predomin&oacute; en el 7.54%, en comparaci&oacute;n con el patr&oacute;n de alteraci&oacute;n en la relajaci&oacute;n (5.66%) y con el patr&oacute;n restrictivo (3.7%) (<a href="#t1">tabla 1</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v71n3/a3t1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Interesantemente, los pacientes con diabetes tipo 1 que mostraron datos ecocardiogr&aacute;ficos compatibles con DDVI ten&iacute;an mayor tiempo de evoluci&oacute;n de la enfermedad (5.17 &plusmn; 1.60 a&ntilde;os vs 3.44 &plusmn; 0.74 a&ntilde;os). Tambi&eacute;n presentaron un mayor peso corporal, talla e &iacute;ndice de masa corporal (IMC) en comparaci&oacute;n con los adolescentes diab&eacute;ticos que no presentaron datos ecocardiogr&aacute;ficos de DDVI (<a href="#t2">tabla 2</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t2"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v71n3/a3t2.jpg"></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Por otra parte, los adolescentes con diabetes tipo 1 que tuvieron DDVI mostraron un mayor descontrol metab&oacute;lico, con elevaci&oacute;n significativa de niveles de glucemia (126.2 &plusmn; 9.29 vs 180.7 &plusmn; 15.5), de la hemoglobina glucosilada (8.47 &plusmn; 1.63 vs 10.01 &plusmn; 1.76) y microalbuminuria (6.09 &plusmn; 1.48 vs 9.07 &plusmn; 1.85) en relaci&oacute;n con los adolescentes diab&eacute;ticos que no cursaron con DDVI (<i>p</i> &lt; 0.05) (<a href="#t3">tabla 3</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v71n3/a3t3.jpg"></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>4. Discusi&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La diabetes mellitus induce dos tipos de complicaciones en el coraz&oacute;n, la aterosclerosis coronaria<sup>32</sup> y la EMCD<sup>33</sup>. La DDVI se considera una fase temprana de EMCD<sup>10,34</sup> que se observa en pacientes diab&eacute;ticos que no presentan ninguna sintomatolog&iacute;a cardiovascular. La frecuencia oscila entre el 18 y el 69%. Esta amplia diferencia posiblemente se deba a las diferentes formas de seleccionar a los pacientes, a las t&eacute;cnicas de exploraci&oacute;n y a las distintas definiciones de la DDVI<sup>20,21</sup>. En este estudio se observ&oacute; que el 16.98% de los adolescentes con diabetes tipo 1 present&oacute; datos ecocardiog&aacute;ficos compatibles con DDVI. Por otra parte, diversos estudios efectuados en los pacientes diab&eacute;ticos concuerdan que la mayor prevalencia de DDVI se incrementa con el mal control metab&oacute;lico de la enfermedad y con la obesidad en los pacientes<sup>35&#45;37</sup>. En este trabajo tambi&eacute;n se observ&oacute; que los adolescentes diab&eacute;ticos presentaban dichos factores de riesgo, obesidad y mal control metab&oacute;lico.</font></p>  	    <p align="justify"><font face="verdana" size="2">El diagn&oacute;stico de la DDVI se basa en los hallazgos ecocardiogr&aacute;ficos, puesto que este m&eacute;todo eval&uacute;a fundamentalmente el flujo transmitral mediante Doppler, y las mediciones de la velocidad de llenado ventricular, tiempo de desaceleraci&oacute;n, tiempo de relajaci&oacute;n isovolum&eacute;trico y la valoraci&oacute;n de los patrones de flujo. Conforme la funci&oacute;n mioc&aacute;rdica diast&oacute;lica empeora, el llenado diast&oacute;lico precoz (onda E) se reduce y el patr&oacute;n muestra un retardo en la relajaci&oacute;n mioc&aacute;rdica. Sin embargo, cuando la presi&oacute;n de la aur&iacute;cula izquierda aumenta, la onda E vuelve a la normalidad, con un patr&oacute;n de flujo mitral indistinguible de lo normal, por lo que se ha denominado patr&oacute;n pseudonormal<sup>16&#45;19</sup>. A medida que progresa la DDVI se desarrolla un patr&oacute;n de llenado restrictivo, el cual refleja la presi&oacute;n elevada de la aur&iacute;cula izquierda y suele acompa&ntilde;arse de s&iacute;ntomas de insuficiencia cardiaca. A pesar de la utilidad de estas mediciones, existe una limitaci&oacute;n que radica en la dependencia de estas t&eacute;cnicas de la precarga. Esto implica que un mismo paciente pueda cambiar de patr&oacute;n de flujo mitral en funci&oacute;n de que la presi&oacute;n en la aur&iacute;cula izquierda aumente o disminuya. Por esto, la valoraci&oacute;n del patr&oacute;n del flujo de las venas pulmonares puede limitar estas variaciones y permitir la diferenciaci&oacute;n entre el patr&oacute;n normal y el pseudonormal<sup>28&#45;30</sup>. En el grupo de pacientes diab&eacute;ticos que presentaron datos ecocardiogr&aacute;ficos compatibles con DDVI, el patr&oacute;n tipo 2 o patr&oacute;n pseudonormalizado predomin&oacute; en el 7.54% del total de los pacientes. El patr&oacute;n 1, alteraci&oacute;n de la relajaci&oacute;n, y el patr&oacute;n 3, se observaron en el 5.66 y el 3.77%, respectivamente. Estos hallazgos son interesantes puesto que, frecuentemente, se asocian con un mayor tiempo de evoluci&oacute;n del cuadro diab&eacute;tico y con un descontrol metab&oacute;lico de la enfermedad<sup>36&#45;38</sup>, aspectos que presentaron los adolescentes con diabetes tipo 1 y DDVI estudiados en este trabajo.</font></p>  	    <p align="justify"><font face="verdana" size="2">Asimismo, existe el consenso general de que la hiperglucemia cr&oacute;nica es uno de los factores de riesgo que frecuentemente est&aacute; implicado en la fisiopatolog&iacute;a de la DDVI, debido a que, durante el estado diab&eacute;tico, se produce glucosilaci&oacute;n no enzim&aacute;tica de las prote&iacute;nas en los miocardiocitos, aumento del estr&eacute;s oxidativo, activaci&oacute;n de la prote&iacute;na cinasa C y dep&oacute;sito de fibras de col&aacute;gena en el intersticio mioc&aacute;rdico<sup>10&#45;12,39</sup>. Por lo tanto, la relaci&oacute;n que guarda el control glic&eacute;mico con los &iacute;ndices ecocardiogr&aacute;ficos de DDVI apoya la hip&oacute;tesis de que la hiperglucemia induce el inicio de la EMCD<sup>10,34,38</sup>. En este contexto, los resultados cl&iacute;nicos y bioqu&iacute;micos observados en los pacientes diab&eacute;ticos que tuvieron DDVI, confirmaron el hecho de que el mal control metab&oacute;lico, aunado a la obesidad y a la hiperalbuminuria, son par&aacute;metros determinantes de la disfunci&oacute;n diast&oacute;lica del ventr&iacute;culo izquierdo.</font></p>  	    <p align="justify"><font face="verdana" size="2">En conclusi&oacute;n, la DDVI es una complicaci&oacute;n frecuente (16.98%) en los adolescentes con diabetes tipo 1. Aquellos con DDVI presentaron obesidad con mayor frecuencia, mayor tiempo de evoluci&oacute;n de la enfermedad y demostraron un peor control metab&oacute;lico. Por lo tanto, proponemos efectuar una b&uacute;squeda oportuna y sistem&aacute;tica de esta complicaci&oacute;n a trav&eacute;s de un estudio de ecocardiograf&iacute;a en todos los pacientes adolescentes con diabetes tipo 1.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Conflicto de intereses</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los autores declaran no tener ning&uacute;n conflicto de intereses.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Este trabajo se efectu&oacute; gracias al apoyo financiero otorgado por el Instituto Mexicano del Seguro Social (FIS/IMSS/PROT/ G11&#45;2/102).</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Bertoni AG, Hundley WG, Massing MW, Bonds DE, Burke GL, Goff DC Jr. Heart failure prevalence, incidence, and mortality in the elderly with diabetes. 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