<?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>S0300-90412017001100735</article-id>
<article-id pub-id-type="doi">10.24245/gom.v85i11.1528</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Número óptimo de ovocitos: modelo de predicción para fertilización in vitro]]></article-title>
<article-title xml:lang="en"><![CDATA[Optimal number of oocytes: In vitro fertilization predictive model]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Rioja]]></surname>
<given-names><![CDATA[MJ]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Cañas]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Recio-López]]></surname>
<given-names><![CDATA[Y]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Garza]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-González]]></surname>
<given-names><![CDATA[CM]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hinojosa-Rodríguez]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laresgoiti-Servitje]]></surname>
<given-names><![CDATA[E]]></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>
</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>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes Departamento de Investigación ]]></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>11</numero>
<fpage>735</fpage>
<lpage>747</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0300-90412017001100735&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0300-90412017001100735&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0300-90412017001100735&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  OBJETIVO: desarrollar un modelo de predicción para conseguir un recién nacido vivo con el menor número de ovocitos capturados.  MATERIALES Y MÉTODOS: estudio observacional, longitudinal y retrolectivo, efectuado en el Instituto Nacional de Perinatología entre 2011 y 2016 en ciclos de FIV en fresco. Criterios de inclusión: pacientes mayores de 18 años de edad, con diagnóstico de infertilidad, a quienes se realizó fertilización in vitro con transferencia de embriones en fresco (FIV-TE). Las variables de estudio fueron: edad, IMC, concentración basal de FSH, tipo de infertilidad, tiempo de infertilidad y número de ovocitos capturados. Se elaboró un árbol de decisión tipo CHAID y un modelo binario de regresión logística. Para el análisis estadístico se utilizó el programa Statistic Package for Social Sciences (SPSS). Se consideró significativa la probabilidad de error alfa &lt; 5%.  RESULTADOS: se registraron 673 ciclos, de los que se obtuvieron 5,910 óvulos. El número óptimo de ovocitos recuperados fue mayor de 12 (independientemente de la edad), con RM = 4.666, IC95%: 2.676-8.137, p = &lt;0.01. Las mujeres menores de 37 años de edad, con concentración basal de FSH &lt;4.2 mUI/mL y recuperación de hasta 5 ovocitos tuvieron mayor posibilidad (28%) de obtener un recién nacido vivo (&#967;2 = 7.797; gl = 1, p = &lt;0.047); por su parte, las pacientes entre 38 y 40 años de edad (RM = 0.338, IC95%: 0.147-0.776, p = &lt;0.011) y tiempo de infertilidad de 10 a 12 años de evolución (RM = 0.394, IC95%: 0.181-0.858, p = 0.019) tuvieron menor posibilidad de obtener un recién nacido vivo.  CONCLUSION: el número óptimo de ovocitos a recuperar es mayor de 12 (independientemente de la edad). Las mujeres menores de 37 años de edad, con concentración basal de FSH &lt;4.2 mUI/mL y captura de hasta 5 ovocitos tienen mayor posibilidad de tener un recién nacido vivo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  OBJECTIVE: Develop a model to optimize the reproductive outcome (live birth rate). Identify the minimal number of oocytes to capture.  MAERIALS AND METHODS: Observational, longitudinal, and retrolective study was made. In fresh IVF cycles, performed at INPer between 2011-2016. A logistic regression model was fitted with a CHAID, and performed a decision tree to predict live birth (LBR). Inclusion criteria: patients over 18 years of age, diagnosed with infertility, who underwent in vitro fertilization with fresh embryo transfer (FIV-TE). The study variables were: age, BMI, basal FSH concentration, type of infertility, time of infertility and number of oocytes captured. A decision tree type CHAID and a binary logistic regression model were performed. Statistical Package for Social Sciences (SPSS) was used for the statistical analysis. The probability of error alpha &lt;5% was considered significant.  RESULTS: A total of 673 cycles were studied. The optimal number was &gt;12 oocytes (OR = 4.666, 95% CI: 2.676-8.137, p=&lt;0.01). The highest chance to have LB (28%), was in women &lt;37 years old, with FSH &lt;4.2 mIU / mL and &lt;5 oocytes; &#967;2 = 7.797 (df = 1, p = &lt;0.047). The lowest chance was in 38-40 years (OR = 0.338, 95% CI: 0.147-0.776, p = &lt;0.011) with a longer lapse of infertility; 10-12 years (OR = 0.394, 95% CI: 0.181-0.858, p = 0.019).  CONCLUSION: Our data suggest that in the &gt;12 oocytes may be the optimal number to obtain, independent of the age. On the other hand the best chance to have a live birth is with an age &lt;37, FSH &lt;4.2 mIU/mL and &lt;5 oocytes. Fewer oocytes than previously deemed optimal, because the probability of having a euploid embryo in this group of people is much bigger.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[número mínimo de ovocitos]]></kwd>
<kwd lng="es"><![CDATA[fertilización in vitro]]></kwd>
<kwd lng="es"><![CDATA[modelos predictivo de resultados reproductivos]]></kwd>
<kwd lng="en"><![CDATA[Optimal number of oocytes]]></kwd>
<kwd lng="en"><![CDATA[In vitro fertilization]]></kwd>
<kwd lng="en"><![CDATA[Reproductive outcome predictor model]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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