<?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>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422022000600020</article-id>
<article-id pub-id-type="doi">10.22201/fm.24484865e.2022.65.6.04</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nudo verdadero como causa de taquicardia fetal persistente Reporte de un caso]]></article-title>
<article-title xml:lang="en"><![CDATA[True Knot as a Cause of Persistent Fetal Tachycardia. Case Report]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Geraldo-Murillo]]></surname>
<given-names><![CDATA[José Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera Rojas]]></surname>
<given-names><![CDATA[José Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California  ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital General con Especialidades &#8220;Juan María de Salvatierra&#8221;  ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Hospital General con Especialidades &#8220;Juan María de Salvatierra&#8221;  ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>65</volume>
<numero>6</numero>
<fpage>20</fpage>
<lpage>25</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422022000600020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422022000600020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422022000600020&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las anomalías del cordón umbilical están asociadas a efectos adversos durante el embarazo. El nudo verdadero del cordón umbilical está presente en el 0.3-2.1% de los embarazos y se ha asociado a muerte fetal. Dentro de los factores de riesgo se incluye, la edad materna, índice de masa corporal (IMC) elevado, multiparidad, trastornos hipertensivos, tabaquismo, polihidramnios, diabetes gestacional, sexo masculino del feto y otras malformaciones. El diagnóstico prenatal del nudo verdadero es raro y un desafío. La mayoría se diagnostica durante el nacimiento y sólo el 0.08% de los nudos verdaderos son diagnosticados de manera prenatal. El registro cardiotocográfico puede registrar trazos no tranquilizadores que reflejan que hay un estrés hipóxico o mecánico que interrumpe la oxigenación fetal. El objetivo de este reporte es mostrar un caso de nudo verdadero del cordón umbilical que presentó taquicardia fetal persistente durante el trabajo de parto con terminación del embarazo vía vaginal.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Umbilical cord abnormalities are associated with adverse effects during pregnancy. The true umbilical cord knot is present in 0.3-2.1% of pregnancies and has been associated with fetal death. Risk factors include maternal age, high BMI, multiparity, hypertensive disorders, smoking, polyhydramnios, gestational diabetes, male sex of the fetus, and other malformations. Prenatal diagnosis of the true knot is rare and challenging. Most are diagnosed at birth and only 0.08% of true knots are diagnosed prenatally. Non-reassuring cardiotocography traces may be present, reflecting hypoxic or mechanical stress disrupting fetal oxygenation. The aim of this case report is to present a case of true umbilical cord knot presenting with persistent fetal tachycardia during labor, resolved by vaginal delivery.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Nudo verdadero]]></kwd>
<kwd lng="es"><![CDATA[cordón umbilical]]></kwd>
<kwd lng="es"><![CDATA[taquicardia fetal]]></kwd>
<kwd lng="es"><![CDATA[muerte fetal]]></kwd>
<kwd lng="es"><![CDATA[hipoxia fetal]]></kwd>
<kwd lng="en"><![CDATA[True knot]]></kwd>
<kwd lng="en"><![CDATA[umbilical cord]]></kwd>
<kwd lng="en"><![CDATA[fetal tachycardia]]></kwd>
<kwd lng="en"><![CDATA[stillbirth]]></kwd>
<kwd lng="en"><![CDATA[fetal asphyxia]]></kwd>
</kwd-group>
</article-meta>
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