<?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>S0300-90412017000700421</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Resultados de los ciclos con transferencia de embriones desvitrificados: experiencia institucional de seis años]]></article-title>
<article-title xml:lang="en"><![CDATA[Results of cycles with transfers of devitrified embryos: a six year institutional experience]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barros-Delgadillo]]></surname>
<given-names><![CDATA[JC]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo-Ruiz]]></surname>
<given-names><![CDATA[AK]]></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 Departamento de Reproducción Asistida ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>85</volume>
<numero>7</numero>
<fpage>421</fpage>
<lpage>432</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0300-90412017000700421&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0300-90412017000700421&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0300-90412017000700421&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  OBJETIVO: conocer los resultados de los ciclos con transferencia de embriones desvitrificados en una institución.  MATERIALES Y MÉTODOS: estudio observacional, descriptivo, efectuado en pacientes del servicio de Reproducción Asistida del Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, entre enero de 2010 y diciembre de 2015, que recibieron ciclos de transferencia de embriones congelados. La información se recolectó en una base de datos que se analizaron con el programa SPSS, versión 22, con expresión de media ± desviación estándar, cálculo de &#967;2 con grado de libertad y valor de p.  RESULTADOS: se estudiaron 213 pacientes; tiempo de infertilidad: 6.2 ±3.8 años con 59.2% y 52.1% con infertilidad secundaria. La dosis suplementaria de 17 &#946; estradiol fue de 72 mg (4/6/8 mg) con 97.2%. La media de la concentración de estradiol durante la fase suplementaria previa a la transferencia embrionaria al día 12 fue de 507.23 ± 216.25 pg/dL. El 59.6% recibió 2 embriones, 64.8% de calidad II, 86.4% en día 3 de desarrollo embrionario. La fracción &#946; hCG fue positiva en 16% de los ciclos transferidos. La tasa de implantación fue de 19.7% y la de embarazo clínico de 12.2%. El embarazo viable se alcanzó en 10.3% y la tasa de aborto fue de 3.4%.  CONCLUSIONES: conforme exista mejor sincronía entre el desarrollo endometrial, la calidad embrionaria y el día de desarrollo embrionario, aumentarán las posibilidades de transferir en el momento óptimo de la ventana de implantación y, con ello, de las tasas de nacidos vivos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  OBJECTIVE: to know the results of cycles with transfers of devitrified embryos in one institution.  MATERIAL AND METHOD:  observational, descriptive trial performed in patients of the Assisted Reproduction department of the Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, between January 2010 and December 2015, who received cycles of frozen embryo transfers. The information was collected in a data base that was analyzed with the SPSS program, version 22, with expression of mean ± standard deviation, calculation of X2 with degrees of freedom and a p value.  RESULTS: 213 patients were studied; time of infertility: 6.2 ±3.8 years with 59.2% and 52.1% with secondary infertility. The additional dose of 17 &#946; estradiol was 72 mg (4/6/8 mg) with 97.2%. The mean concentration of estradiol during the additional phase before the embryo transfer on day 12 was 507.23 ± 216.25 pg/dL. 59.6% received 2 embryos, 64.8% quality II, 86.4% on day 3 of embryo development. The &#946; hCG fraction was positive in 16% of the cycles transferred. The implantation rate was 19.7% and the clinical pregnancy rate was 12.2%. Feasible pregnancy was obtained in 10.3% and the abortion rate was 3.4%.  CONCLUSIONS: as there is better synchrony between the endometrial development, the embryo quality and the embryo development day, the possibilities of transfer increase in the optimal moment of the implantation window, and with that, the rate of live births.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[transferencia embrionaria]]></kwd>
<kwd lng="es"><![CDATA[embriones desvitrificados]]></kwd>
<kwd lng="en"><![CDATA[embryo transfer]]></kwd>
<kwd lng="en"><![CDATA[devitrified embryos]]></kwd>
</kwd-group>
</article-meta>
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