<?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>0016-3813</journal-id>
<journal-title><![CDATA[Gaceta médica de México]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. Méd. Méx]]></abbrev-journal-title>
<issn>0016-3813</issn>
<publisher>
<publisher-name><![CDATA[Academia Nacional de Medicina de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-38132019000200162</article-id>
<article-id pub-id-type="doi">10.24875/gmm.19004569</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores predictores del estado libre de cálculos en la primera ureteroscopia flexible con litotricia láser]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado-Alcaraz]]></surname>
<given-names><![CDATA[Efraín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Negrín]]></surname>
<given-names><![CDATA[Mario Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Silverio]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Mercado]]></surname>
<given-names><![CDATA[León Octavio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Sámano]]></surname>
<given-names><![CDATA[Virgilio Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montoya-Martínez]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Palacios]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional Siglo XXI ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Medicina ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>155</volume>
<numero>2</numero>
<fpage>162</fpage>
<lpage>167</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132019000200162&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132019000200162&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132019000200162&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: La ureteroscopia flexible con litotricia láser (URSLL) es una modalidad mínimamente invasiva de tratamiento quirúrgico de cálculos renales. La selección inadecuada de pacientes para este procedimiento genera un desbalance de costo-efectividad.  Objetivo: Conocer los factores predictores de estado libre de litos en un solo tiempo quirúrgico en pacientes sometidos a URSLL.  Método: Cohorte retrospectiva de pacientes sometidos a URSLL. Se realizó un análisis univariado y multivariado (regresión logística) de los predictores de estado libre de cálculos en la primera URSLL, global y categorizado por sexo.  Resultados: EL estado libre de cálculos en la primera URSLL fue de 73.62 %. Los predictores de estado libre de cálculos en hombres fueron edad y tamaño, densidad y multiplicidad del cálculo; en las mujeres, el índice de masa corporal y la multiplicidad del cálculo.  Conclusiones: Los factores pronósticos de estado libre de cálculos en la primera URSLL son distintos en hombres y mujeres. Las mujeres con obesidad y sobrepeso probablemente tengan cálculos de fácil fragmentación y extracción asociados con ácido úrico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Flexible ureteroscopy and laser fragmentation (FURSL) is a minimally invasive modality for surgical treatment of renal stones. Inadequate selection of patients for this treatment generates a cost-effectiveness unbalance.  Objective: To know the stone-free rate predictors in a single surgical time in patients undergoing FURSL.  Method: Retrospective cohort of patients undergoing FURSL. Global and gender-categorized univariate and multivariate (logistic regression) analyses were performed to identify stone-free predictors at first FURSL.  Results: Stone-free rate at first FURSL was 73.62%. Predictors in males were patient age and stone size, density and multiplicity; in females, body mass index and multiplicity of stones.  Conclusions: Stone-free rate predictors at first FURSL are different in males and females. Women with overweight and obesity probably have easy-to-fragment and easy-to-extract stones associated with uric acid.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ureteroscopia]]></kwd>
<kwd lng="es"><![CDATA[Cálculos renales]]></kwd>
<kwd lng="es"><![CDATA[Resultado del tratamiento]]></kwd>
<kwd lng="es"><![CDATA[Costos y análisis de costos]]></kwd>
<kwd lng="es"><![CDATA[Obesidad]]></kwd>
<kwd lng="en"><![CDATA[Ureteroscopy]]></kwd>
<kwd lng="en"><![CDATA[Kidney stones]]></kwd>
<kwd lng="en"><![CDATA[Obesity]]></kwd>
<kwd lng="en"><![CDATA[Costs and cost analysis]]></kwd>
</kwd-group>
</article-meta>
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