<?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>0300-9041</journal-id>
<journal-title><![CDATA[Ginecología y obstetricia de México]]></journal-title>
<abbrev-journal-title><![CDATA[Ginecol. obstet. Méx.]]></abbrev-journal-title>
<issn>0300-9041</issn>
<publisher>
<publisher-name><![CDATA[Federación Mexicana de Colegios de Obstetricia y Ginecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0300-90412021000800003</article-id>
<article-id pub-id-type="doi">10.24245/gom.v89i8.5619</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Hallazgos histopatológicos placentarios en nacimientos de pretérmino y término precoz]]></article-title>
<article-title xml:lang="en"><![CDATA[Placental histopathological findings in preterm births and early term]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morán,]]></surname>
<given-names><![CDATA[Rosario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vaamonde]]></surname>
<given-names><![CDATA[Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rey]]></surname>
<given-names><![CDATA[Grazzia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República  ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la República  ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>89</volume>
<numero>8</numero>
<fpage>595</fpage>
<lpage>602</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0300-90412021000800003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0300-90412021000800003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0300-90412021000800003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  OBJETIVO:  Analizar las placentas de pretérmino y término precoz de pacientes atendidas en la Maternidad del Hospital Universitario para la valoración de los hallazgos histopatológicos según las semanas de gestación.  MATERIALES Y MÉTODOS:  Estudio prospectivo, observacional y descriptivo llevado a cabo en la Maternidad del Hospital de Clínicas entre agosto de 2015 y febrero de 2016. La población se seleccionó según las semanas de gestación y se incluyeron todos los nacimientos entre las 22 y 30 + 6-7 de gestación. Criterios de exclusión: embarazos gemelares y malformaciones fetales. Las pruebas estadísticas aplicadas, según el tipo de variables, fueron prueba t de Student y &#967;2 con corrección de Fisher para muestras pequeñas.  RESULTADOS:  Se registraron 410 nacimientos: 130 de te&#769;rmino precoz (solo se evaluaron 67) y 45 de prete&#769;rmino (solo se evaluaron 43). El principal hallazgo histopatológico en ambas poblaciones fue la mala perfusión vascular materna seguido de 40% de placentas inmaduras en los de término precoz.  CONCLUSIONES:  El hallazgo histopatológico más frecuente fue la mala perfusión vascular materna en ambas poblaciones evaluadas, quizá debido al tipo de embarazo de alto riesgo obstétrico médico. El conocimiento de las patologías placentarias puede orientar hacia la causa de la prematurez y su clasificación, además de ayudar a la toma de decisiones en cuanto al neonato y a la planificación futura de otro embarazo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  OBJECTIVE:  To analyze preterm and early term placentas of patients attended at the Maternity of the University Hospital for the evaluation of histopathological findings in view of weeks of gestation.  MATERIALS AND METHODS:  Prospective, observational and descriptive study carried out at the Maternity Hospital of the Hospital de Clínicas between August 2015 and February 2016. The population was selected according to weeks of gestation and all births between 22 and 38 + 6-7 days of gestation were included. Twin pregnancy and fetal malformations were used as exclusion criteria. The statistical tests applied, according to the type of variables, were Student's t-test and 2 with Fisher's correction for small samples.  RESULTS:  410 births were registered: 130 early term (only 67 were evaluated) and 45 preterm (only 43 were evaluated). The main pathologic histologic finding in both populations was poor maternal vascular perfusion followed by 40% immature placentas in early term.  CONCLUSIONS:  The most frequent histopathologic finding was poor maternal vascular perfusion in both populations evaluated, perhaps due to the type of maternity with high medical obstetric risk. The knowledge of placental pathologies can orient towards the cause of prematurity and its classification, as well as help in decision making regarding the neonate and the future planning of another pregnancy.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pretérmino]]></kwd>
<kwd lng="es"><![CDATA[placenta]]></kwd>
<kwd lng="es"><![CDATA[nacimientos]]></kwd>
<kwd lng="es"><![CDATA[perfusión]]></kwd>
<kwd lng="es"><![CDATA[maternidad]]></kwd>
<kwd lng="es"><![CDATA[riesgo obstétrico]]></kwd>
<kwd lng="es"><![CDATA[prematurez]]></kwd>
<kwd lng="es"><![CDATA[neonatos]]></kwd>
<kwd lng="en"><![CDATA[Preterm]]></kwd>
<kwd lng="en"><![CDATA[Placenta]]></kwd>
<kwd lng="en"><![CDATA[Births]]></kwd>
<kwd lng="en"><![CDATA[Perfusion]]></kwd>
<kwd lng="en"><![CDATA[Maternity]]></kwd>
<kwd lng="en"><![CDATA[Obstetric risk]]></kwd>
<kwd lng="en"><![CDATA[Prematurity]]></kwd>
<kwd lng="en"><![CDATA[Neonate]]></kwd>
</kwd-group>
</article-meta>
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