<?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>S0016-38132021000200154</article-id>
<article-id pub-id-type="doi">10.24875/gmm.20000183</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cambios en el patrón epidemiológico de la colitis ulcerosa crónica idiopática en México en un hospital de tercer nivel de atención]]></article-title>
<article-title xml:lang="en"><![CDATA[Changes in chronic idiopathic ulcerative colitis epidemiological pattern in Mexico in a tertiary care hospital]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yamamoto-Furusho]]></surname>
<given-names><![CDATA[Jesús K.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Morales]]></surname>
<given-names><![CDATA[German E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Clínica de Enfermedad Inflamatoria Intestinal Departamento de Gastroenterología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></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>154</fpage>
<lpage>159</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132021000200154&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132021000200154&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132021000200154&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: La colitis ulcerosa crónica idiopática (CUCI) es una enfermedad con inflamación crónica de la mucosa del colon de origen multifactorial. El objetivo de este trabajo es identificar posibles cambios en el comportamiento de la CUCI en un hospital de referencia.  Métodos: Se incluyeron nuevos casos de CUCI confirmados por histopatología de enero del 2007 a diciembre del 2014.  Resultados: Se incluyeron un total de 189 pacientes. La media de nuevos casos anuales de CUCI fue de 23.6. Este estudio incorpora 95 pacientes de sexo masculino (50 %) y 94 de sexo femenino (50 %), con una edad promedio al diagnóstico de 44.6 años. La frecuencia de pancolitis fue del 77 %, en comparación con el 59 % en el periodo anterior. Las manifestaciones extraintestinales (MEI) estuvieron presentes en el 55.8 % y las colectomías en el 5.2 %.  Conclusión: Algunas características de la enfermedad han cambiado con el tiempo: aumento de la frecuencia de pancolitis y MEI, así como disminución de la tasa de colectomías.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Chronic idiopathic ulcerative colitis (CIUC) is a disease with multifactorial chronic inflammation of the colonic mucosa. In Mexico, there are studies that show an increase in the frequency of new cases. The purpose of this work was to identify possible changes in CIUC behavior in a referral hospital.  Methods: New ulcerative colitis (UC) cases confirmed by histopathology from January 2007 to December 2014 were included.  Results: A total of 189 patients were included. Mean number of UC annual new cases was 23.6. The study included 95 male patients (50 %) and 94 female patients (50 %), with an average age of 44.6 years at diagnosis. The frequency of pancolitis was 77 %, in comparison with 59 % in the previous period. Extra-intestinal manifestations (EIM) were present in 55.8 % and colectomies in 5.2 %.  Conclusion: Some characteristics of the disease have changed over time: there is an increased frequency of pancolitis and EIM, as well as a decrease in the rate of colectomies.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Colitis ulcerosa crónica idiopática (CUCI)]]></kwd>
<kwd lng="es"><![CDATA[América Latina]]></kwd>
<kwd lng="es"><![CDATA[Curso Clínico]]></kwd>
<kwd lng="es"><![CDATA[Fenotipo]]></kwd>
<kwd lng="en"><![CDATA[Chronic idiopathic ulcerative colitis (CIUC)]]></kwd>
<kwd lng="en"><![CDATA[Latin America]]></kwd>
<kwd lng="en"><![CDATA[Clinical course]]></kwd>
<kwd lng="en"><![CDATA[Phenotype]]></kwd>
</kwd-group>
</article-meta>
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