<?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>0016-3813</journal-id>
<journal-title><![CDATA[Gaceta médica de México]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. Méd. Méx]]></abbrev-journal-title>
<issn>0016-3813</issn>
<publisher>
<publisher-name><![CDATA[Academia Nacional de Medicina de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-38132021000200140</article-id>
<article-id pub-id-type="doi">10.24875/gmm.20000143</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Historia familiar de enfermedad tiroidea y riesgo de hipotiroidismo congénito en neonatos con síndrome de Down]]></article-title>
<article-title xml:lang="en"><![CDATA[Family history of thyroid disease and risk of congenital hypothyroidism in neonates with Down syndrome]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corona-Rivera]]></surname>
<given-names><![CDATA[Jorge R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Andrade-Romo]]></surname>
<given-names><![CDATA[Topacio O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre-Salas]]></surname>
<given-names><![CDATA[Liuba M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bobadilla-Morales]]></surname>
<given-names><![CDATA[Lucina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aranda-Sánchez]]></surname>
<given-names><![CDATA[Cristian I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corona-Rivera]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Ramírez]]></surname>
<given-names><![CDATA[René O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Civil de Guadalajara Dr. Juan I. Menchaca Centro de Registro e Investigación sobre Anomalías Congénitas Servicio de Genética y Unidad de Citogenética]]></institution>
<addr-line><![CDATA[Guadalajara Jal]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara Instituto de Genética Humana Dr. Enrique Corona-Rivera Departamento de Biología Molecular y Genómica]]></institution>
<addr-line><![CDATA[Guadalajara Jal]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Hospital Civil de Guadalajara Dr. Juan I. Menchaca Servicio de Endocrinología ]]></institution>
<addr-line><![CDATA[Guadalajara Jal]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Hospital Civil de Guadalajara Dr. Juan I. Menchaca. Guadalajara Servicio de Neonatología ]]></institution>
<addr-line><![CDATA[Guadalajara Jal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>157</volume>
<numero>2</numero>
<fpage>140</fpage>
<lpage>146</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132021000200140&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132021000200140&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132021000200140&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: La historia familiar de enfermedad tiroidea (HFET) como factor de riesgo para hipotiroidismo congénito (HC), en síndrome de Down (SD) aún no ha sido explorada.  Objetivo: Determinar si la HFET está asociada a mayor riesgo de HC en neonatos con SD.  Método: Estudio de casos y controles en 220 neonatos con SD. Se compararon las pruebas de función tiroidea (PFT) de 37 con SD e HFET (casos), frente a las PFT de 183 recién nacidos con SD sin HFET (grupo de referencia). Se realizó análisis de regresión logística multivariante y se calculó la razón de momios (RM) y sus respectivos intervalos de confianza del 95 % (IC 95 %).  Resultados: Nueve casos HC (4.1 %). El HC mostró asociación con la HFET (RMa = 8.3, IC 95 %: 2.0-34.3), particularmente en los varones (RMa = 9.0, IC 95 %: 1.6-49.6). La ausencia de HFET tuvo una RM de protección para HC (RMa = 0.4, IC 95 %: 0.1-0.8).  Conclusiones: La HFET puede es una estrategia fácil y accesible para identificar pacientes con SD con mayor riesgo de HC.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Family history of thyroid disease (FHTD) as risk factor for congenital hypothyroidism (CH) in patients with Down syndrome (DS) has not yet been explored.  Objective: To determine whether FHTD is associated with an increased risk for CH in DS.  Method: Case-control study in 220 neonates with DS. Thyroid function tests of 37 infants with DS and FHTD (cases) were compared with those of 183 DS newborns without FHTD (reference group). Data were analyzed using multivariate logistic regression analysis and adjusted odds ratios (aORs) with their respective 95 % confidence intervals (CI) were calculated.  Results: Nine newborns with DS in our sample had CH (4.1 %). FHTD showed an association with CH in neonates with DS (aOR = 8.3, 95 % CI: 2.0-34.3), particularly in males (aOR = 9.0, 95 % CI: 1.6-49.6). In contrast, newborns with DS without FHTD were less likely to suffer from CH (aOR = 0.4, 95 % CI: 0.1-0.8).  Conclusions: FHTD detailed evaluation can be an easy and accessible strategy to identify those newborns with DS at higher risk for CH.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Síndrome de Down]]></kwd>
<kwd lng="es"><![CDATA[Hipotiroidismo congénito]]></kwd>
<kwd lng="es"><![CDATA[TSH]]></kwd>
<kwd lng="es"><![CDATA[T4 libre]]></kwd>
<kwd lng="es"><![CDATA[Historia familiar de enfermedad tiroidea]]></kwd>
<kwd lng="en"><![CDATA[Down syndrome]]></kwd>
<kwd lng="en"><![CDATA[Congenital hypothyroidism]]></kwd>
<kwd lng="en"><![CDATA[TSH]]></kwd>
<kwd lng="en"><![CDATA[Free T4]]></kwd>
<kwd lng="en"><![CDATA[Family history of thyroid disease]]></kwd>
</kwd-group>
</article-meta>
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