<?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>2448-8909</journal-id>
<journal-title><![CDATA[Medicina crítica (Colegio Mexicano de Medicina Crítica)]]></journal-title>
<abbrev-journal-title><![CDATA[Med. crít. (Col. Mex. Med. Crít.)]]></abbrev-journal-title>
<issn>2448-8909</issn>
<publisher>
<publisher-name><![CDATA[Colegio Mexicano de Medicina Crítica A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-89092023000100031</article-id>
<article-id pub-id-type="doi">10.35366/109960</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diferencias en la gravedad del choque hemorrágico en mujeres con placenta previa y acretismo placentario antes y durante la pandemia de COVID-19]]></article-title>
<article-title xml:lang="en"><![CDATA[Differences in the degree of hemorrhagic shock in women with placental insertion anomalies before and during the COVID-19 pandemic]]></article-title>
<article-title xml:lang="pt"><![CDATA[Diferenças na gravidade do choque hemorrágico em mulheres com placenta previa e acretismo placentário antes e durante a pandemia de COVID-19]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nares Torices]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Pacheco]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Calvo]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores Cortés]]></surname>
<given-names><![CDATA[Mildred]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Becerra Navarro]]></surname>
<given-names><![CDATA[Norma Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Hueyopa]]></surname>
<given-names><![CDATA[Heidi Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Balladares Nava]]></surname>
<given-names><![CDATA[Elisa Madai]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Serna-Castellanos]]></surname>
<given-names><![CDATA[Karla Estela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brito Brito]]></surname>
<given-names><![CDATA[Benjamín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vila Herrera]]></surname>
<given-names><![CDATA[Salvador]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rangel Vargas]]></surname>
<given-names><![CDATA[Uriel Emmanuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Auqui Valarezo]]></surname>
<given-names><![CDATA[Sandra Verónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mota Calzada]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Perinatología «Isidro Espinosa de los Reyes»  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>37</volume>
<numero>1</numero>
<fpage>31</fpage>
<lpage>34</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-89092023000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-89092023000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-89092023000100031&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  estudios previos han mostrado una mayor incidencia de todas las causas de hemorragia postparto durante la pandemia de COVID-19. El acretismo placentario es una causa frecuente de hemorragia postparto.  Objetivo:  determinar las diferencias en la severidad del choque hemorrágico y la cantidad de sangrado en mujeres con diagnóstico del espectro placenta previa-acretismo, antes de la pandemia y durante la pandemia por COVID-19.  Material y métodos:  en un estudio con cohortes comparativas de mujeres con placenta previa-acretismo, atendidas en el Instituto Nacional de Perinatología, durante el periodo de enero de 2017 a diciembre de 2019, grupo I (prepandemia), y de enero de 2020 a marzo de 2022, grupo II (pandemia), se comparó entre los grupos la cantidad de hemorragia y la clase del choque hemorrágico de acuerdo a ATLS.  Resultados:  se estudió a 277 mujeres, 211 fueron del grupo I (pre-COVID-19) y 66 del grupo II (COVID-19), se observó una mayor cantidad de sangrado durante la pandemia de COVID versus la fase pre-COVID (2,150.56 ± 1,910.08 mL versus 1,246.34 ± 1,494.1 mL) p = 0.001, existieron diferencias en las proporciones de la gravedad del choque hemorrágico en la fase de pandemia para las clases III y IV.  Conclusión:  se encontró un incremento en la cantidad de sangrado y gravedad del choque durante la pandemia de COVID-19.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  previous studies have shown an increased incidence of all-cause postpartum hemorrhage during the COVID-19 pandemic. Placental accreta is a frequent cause of hemorrhagic shock.  Objective:  determine the severity of shock and the amount of bleeding during the COVID-19 pandemic in women diagnosed with placenta previa and placental accreta.  Material and methods:  in a comparative cohort study of women with placenta previa and accreta treated at the National Institute of Perinatology during the period from January 2017 to December 2019 group I (pre-pandemic) and from January 2020 to March 2022 group II (pandemic) the amount of hemorrhage and the class of hemorrhagic shock according to ATLS were compared between the groups.  Results:  277 women were studied, 211 were from group I (pre COVID-19) and 66 from group II (COVID-19). A greater amount of bleeding was observed during the COVID pandemic versus the pre COVID phase (2,150.56 ± 1,910.08 mL vs 1,246.34 ± 1,494.1 mL) p = 0.001, there were differences in the proportions of severity of hemorrhagic shock in the pandemic phase for classes III and IV.  Conclusion:  an increase in the amount of bleeding and severity of shock was found during the COVID-19 pandemic.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo:  Introdução:  estudos anteriores mostraram uma maior incidência de hemorragia pós-parto de todas as causas durante a pandemia de COVID-19. O acretismo placentário é uma causa frequente de hemorragia pós-parto.  Objetivo:  determinar as diferenças na gravidade do choque hemorrágico e na quantidade de sangramento em mulheres diagnosticadas com o espectro de placenta prévia-acretismo antes da pandemia e durante a pandemia de COVID-19.  Material e métodos:  em um estudo de coorte comparativo de mulheres com placenta prévia e acreta tratadas no Instituto Nacional de Perinatologia durante o período de janeiro de 2017 a dezembro de 2019, grupo I (pré-pandemia) e de janeiro de 2020 a março de 2022, grupo I II (pandemia) a quantidade de sangramento e a classe de choque hemorrágico de acordo com o ATLS foram comparadas entre os grupos.  Resultados:  foram estudadas 277 mulheres, 211 eram do grupo I (pré-COVID-19) e 66 do grupo II (COVID-19). Observou-se uma maior quantidade de sangramento durante a pandemia de COVID versus a fase pré-COVID (2,150.56 ± 1,910.08 mL vs 1,246.34 ± 1,494.1 ml) p = 0.001, houve diferenças nas proporções da gravidade do choque hemorrágico na fase pandêmica para as classes III e IV.  Conclusão:  um aumento na quantidade de sangramento e gravidade do choque foi encontrado durante a pandemia de COVID-19.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[acretismo placentario]]></kwd>
<kwd lng="es"><![CDATA[hemorragia postparto]]></kwd>
<kwd lng="es"><![CDATA[COVID-19]]></kwd>
<kwd lng="es"><![CDATA[acretismo]]></kwd>
<kwd lng="en"><![CDATA[placental accreta]]></kwd>
<kwd lng="en"><![CDATA[postpartum hemorrhage]]></kwd>
<kwd lng="en"><![CDATA[COVID-19]]></kwd>
<kwd lng="en"><![CDATA[accreta]]></kwd>
<kwd lng="pt"><![CDATA[acretismo placentário]]></kwd>
<kwd lng="pt"><![CDATA[hemorragia pós-parto]]></kwd>
<kwd lng="pt"><![CDATA[COVID-19]]></kwd>
<kwd lng="pt"><![CDATA[acreta]]></kwd>
</kwd-group>
</article-meta>
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