<?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>S1665-11462021000500424</article-id>
<article-id pub-id-type="doi">10.24875/bmhim.20000292</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Overweight and obesity in children and adolescents with chronic autoimmune thyroiditis]]></article-title>
<article-title xml:lang="es"><![CDATA[Sobrepeso y obesidad en niños y adolescentes con tiroiditis crónica autoinmunitaria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Mereles]]></surname>
<given-names><![CDATA[Ana P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arguinzoniz-Valenzuela]]></surname>
<given-names><![CDATA[Sletza L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-López]]></surname>
<given-names><![CDATA[Ana P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maqueda-Tenorio]]></surname>
<given-names><![CDATA[Silvia E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Baqué]]></surname>
<given-names><![CDATA[Iñaki]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Pediatría Servicio de Endocrinología ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<volume>78</volume>
<numero>5</numero>
<fpage>424</fpage>
<lpage>431</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462021000500424&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462021000500424&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462021000500424&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: An association between overweight and thyroid dysfunction, including chronic autoimmune thyroiditis (CAT), has been previously described. Patients with overweight and obesity have a higher risk of increased thyroid-stimulating hormone (TSH) and anti-thyroid antibodies. Weight gain may also be a clinical sign of hypothyroidism. This study aimed to describe the frequency of overweight and obesity in children with CAT and to compare thyroid function and antibody titles according to body weight.  Methods: Clinical records from 78 patients with CAT who were followed up at a children's hospital in Mexico City were assessed. We collected demographic, anthropometric, and biochemical data, including thyroid function tests and antibodies. According to body mass index (BMI) percentiles, patients were classified as normal weight, overweight or obese according to BMI percentiles. Also, BMI changes at 6 and 12 months of follow-up were analyzed.  Results: We observed 19.2% of the patients with overweight and 15.4% with obesity. Patients with obesity showed high TSH and low thyroid hormone levels. Also, the frequency of hypothyroidism at presentation was higher in this group. No significant difference was found in antibody titles between groups. A significant BMI percentile reduction was observed during follow-up of patients independently of thyroid function at diagnosis and treatment.  Conclusions: Obesity is related to hypothyroidism in patients with chronic autoimmune thyroiditis, although causality cannot be established through this observational study.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Previamente se ha identificado una asociación entre el sobrepeso y las alteraciones tiroideas, incluyendo la tiroiditis crónica autoinmunitaria (TCA). Los pacientes con sobrepeso y obesidad presentan elevación de la hormona estimulante de la tiroides (TSH) y mayor frecuencia de anticuerpos antitiroideos. Por otro lado, el incremento de peso es un síntoma clásico de hipotiroidismo. El objetivo del trabajo es describir la frecuencia de sobrepeso y obesidad en pacientes con TCA, y comparar la función tiroidea y los anticuerpos antitiroideos según el peso corporal.  Métodos: Se recolectaron datos demográficos, antropométricos y bioquímicos, pruebas de función tiroidea y anticuerpos antitiroideos, de 78 pacientes con TCA atendidos en un hospital pediátrico en la Ciudad de México. Se clasificaron en subgrupos, de acuerdo con el percentil del índice de masa corporal (IMC), como peso normal, sobrepeso y obesidad. Se analizó el comportamiento del IMC a los 6 y 12 meses de los pacientes incluidos.  Resultados: El 19.2% de los pacientes presentaron sobrepeso y el 15.4% obesidad. Se encontraron valores mayores de TSH y menores de hormonas tiroideas en los pacientes con obesidad, quienes presentaron con mayor frecuencia hipotiroidismo al diagnóstico. No se encontraron diferencias significativas en el título de anticuerpos entre los grupos. Durante el seguimiento se observó una disminución significativa en el percentil del IMC en los pacientes, sin diferencias según el tratamiento recibido ni la función tiroidea al diagnóstico.  Conclusiones: La obesidad se asocia con hipotiroidismo como patrón bioquímico inicial en los pacientes con TCA.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hashimoto disease]]></kwd>
<kwd lng="en"><![CDATA[Hypothyroidism]]></kwd>
<kwd lng="en"><![CDATA[Overweight]]></kwd>
<kwd lng="en"><![CDATA[Obesity]]></kwd>
<kwd lng="en"><![CDATA[Pediatrics]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad de Hashimoto]]></kwd>
<kwd lng="es"><![CDATA[Hipotiroidismo]]></kwd>
<kwd lng="es"><![CDATA[Sobrepeso]]></kwd>
<kwd lng="es"><![CDATA[Obesidad]]></kwd>
<kwd lng="es"><![CDATA[Pediatría]]></kwd>
</kwd-group>
</article-meta>
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