<?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>S0300-90412018000900597</article-id>
<article-id pub-id-type="doi">10.24245/gom.v86i9.2179</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Resultados de un programa de reproducción asistida con transferencia de embriones en día 4]]></article-title>
<article-title xml:lang="en"><![CDATA[Results of an assisted reproduction program with embryo transfer on day 4.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Neri-Vidaurri]]></surname>
<given-names><![CDATA[Paloma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Hernández]]></surname>
<given-names><![CDATA[Erika M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vielma-Valdez]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Serviere-Zaragoza]]></surname>
<given-names><![CDATA[Claudio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaona-Arreola]]></surname>
<given-names><![CDATA[Ranferi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Ángeles  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Ángeles  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Hospital Ángeles  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Hospital Ángeles  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Hospital Ángeles  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>86</volume>
<numero>9</numero>
<fpage>597</fpage>
<lpage>605</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0300-90412018000900597&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0300-90412018000900597&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0300-90412018000900597&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  OBJETIVO: Conocer las repercusiones en la reproducción de la aplicación de un programa de trasferencia embrionaria en día 4 y compararlas con trasferencias en día 3 y día 5.  MATERIALES Y MÉTODOS: Estudio prospectivo efectuado en parejas a quienes se aplicó un procedimiento de FIV-ICSI entre marzo de 2015 y julio de 2017. Criterios de inclusión: pacientes de todas las edades, ciclos capturados y trasferidos en fresco y con todos los factores de infertilidad. Criterios de exclusión: casos de ovodonación, ciclos en donde no hubiera embriones a trasferir y ciclos en donde la trasferencia embrionaria fue difícil. Para fines de estudio la población se dividió en tres grupos: grupo A con trasferencia en día 3; grupo B con trasferencia en día 4 y grupo C con trasferencia en día 5. El soporte de fase lútea para los tres grupos fue con progesterona por vía vaginal durante 14 días. Se evaluaron las tasas de embarazo por día de tras-ferencia con el número de embarazos clínicos respecto del número de trasferencias efectuadas y los resultados se compararon con c2; se consideró diferencia significativa el valor de p &lt; 0.05.  RESULTADOS: Se estudiaron 306 parejas. Grupo A: 205 pacientes trasferidas en día 3; grupo B: 62 pacientes trasferidas en día 4; grupo C: 39 pacientes trasferidas en día 5. Se encontró una diferencia significativa (p = 0.035) entre la tasa de embarazo en día 3 y 4 para pacientes mayores de 40 años (11.4 y 31.6%, respectivamente). En todas las edades se observó una tendencia al incremento en la tasa de embarazo cuando la trasferencia embrionaria se llevó a cabo en día 4.  CONCLUSIONES: La trasferencia embrionaria en día 4 de desarrollo puede considerarse una opción más. En este ensayo hubo mejores resultados con respecto a las trasferencias efectuadas en día 3. Es una alternativa viable en trasferencias efectuadas en día 5 con tasas de embarazo muy similares y, en este estudio, incluso mayor.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  OBJECTIVE: To know the reproductive results in an embryo transfer program on day 4 and compare them with transfers in D3 and D5  MATERIALS AND METHODS: A prospective analysis comprised a period from March 2015 to July 2017, with 306 couples undergoing an IVF / ICSI procedure and who met the inclusion criteria (patients of all ages, cycles captured and transferred in fresh and patients with all the factors of infertility) and exclusion (cases of ovodonation, cycles in which there were no embryos to be transferred and cycles in which embryo transfer was difficult). The population was divided into 3 groups: Group A with transferred on day 3; Group B with transferred on day 4) and Group C with transferred on day 5 (TE D5). The luteal phase support for the 3 groups was with progesterone vaginally for 14 days. Pregnancy rates per transfer day were evaluated with the number of clinical pregnancies regarding the number of transfers made and comparing the results with a chi-square test considering significant differences with p &lt; 0.05.  RESULTS: We analyze 306 couples. Group A with 205 patients transferred on day 3 (TE D3); Group B with 62 patients transferred on day 4 (TE D4) and Group C with 39 patients transferred on day 5 (TE D5). A significant difference (p = 0.035) was found between the pregnancy rate on day 3 and 4 for patients over 40 years of age (11.4% and 31.6% respectively), however, an increase tendency was observed at all ages. in the pregnancy rate when the embryo transfer takes place on day 4.  CONCLUSIONS: The embryo transfer on day 4 of development can be considered as one more option, to present better results with respect to the transfers made on day 3, and a very viable alternative in transfers made in D5 with very similar pregnancy rate and in this even greater study.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tasa de embarazo]]></kwd>
<kwd lng="es"><![CDATA[fase lútea]]></kwd>
<kwd lng="es"><![CDATA[trasferencia embrionaria]]></kwd>
<kwd lng="en"><![CDATA[Pregnancy Rate]]></kwd>
<kwd lng="en"><![CDATA[Luteal phase]]></kwd>
<kwd lng="en"><![CDATA[Embryo transfer]]></kwd>
</kwd-group>
</article-meta>
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