<?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>2007-4085</journal-id>
<journal-title><![CDATA[Revista mexicana de urología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. urol.]]></abbrev-journal-title>
<issn>2007-4085</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Urología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-40852018000400273</article-id>
<article-id pub-id-type="doi">10.24245/revmexurol.v78i4.2068</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de un nomograma predictivo de éxito de la litotricia extracorpórea por ondas de choque en el tratamiento de la urolitiasis]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of a nomogram for predicting successful kidney stone treatment through extracorporeal shock wave lithotripsy]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avendaño-Bastidas]]></surname>
<given-names><![CDATA[Santiago Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alcaraz-Gutiérrez]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medrano-Sánchez]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos-Melgarejo]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guillén-Rodríguez]]></surname>
<given-names><![CDATA[Julio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pulido-Contreras]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Padilla]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro Médico Nacional del Bajío Unidad Médica de Alta Especialidad 1 ]]></institution>
<addr-line><![CDATA[León Guanajuato]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro Médico Nacional del Bajío Unidad Médica de Alta Especialidad 1 ]]></institution>
<addr-line><![CDATA[León Guanajuato]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>78</volume>
<numero>4</numero>
<fpage>273</fpage>
<lpage>282</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40852018000400273&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40852018000400273&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40852018000400273&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  OBJETIVO:  Analizar el valor predictivo de un nomograma, identificar las variables predictoras de tasa libre de cálculos y evaluar el estado actual la litotricia extracorpórea por ondas de choque como tratamiento para la litiasis renal.  MÉTODOS: Estudio prospectivo efectuado en pacientes con diagnóstico de litiasis renal y tomografía computada (TAC) tres semanas después de la última sesión de litotrisia extracorpórea. Determinación del estado libre de cálculos a las 3 semanas postratamiento. Evaluar el rendimiento pronóstico del nomograma de Kim vs TAC para determinar la predicción del estado libre de cálculos. Se realizó estadística bayesiana para calcular la prevalencia de litiasis después de la prueba y se analizó con curva ROC para determinar el área bajo la curva de todos los valores; además, reporte del IC95%.  RESULTADOS: Se registraron 110 pacientes, la eficacia general de la litotricia extracorpórea fue de 69%. El análisis del nomograma mostró un área bajo la curva de 0.627. El número y diámetro máximo de los cálculos mostró diferencias estadísticamente significativas en la tasa libre de cálculos. Al evaluar otras variables se determinó que el volumen y las unidades Hounsfield también fueron predictivas del resultado final del tratamiento.  CONCLUSIONES: La litotricia extracorpórea por ondas de choque representa un tratamiento aún efectivo en pacientes con litiasis renal. Con las variables predictivas identificadas puede efectuarse una mejor selección de pacientes ideales para esta técnica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  OBJECTIVE: To analyze the predictive performance of a nomogram and identify other predictive variables of stone-free rate, as well as to evaluate the current status of extracorporeal shock wave lithotripsy in the treatment of kidney stones.  MATERIALS AND METHODS: The prospective evaluation of the Kim nomogram as a predictive tool for stone-free rate after extracorporeal shock wave lithotripsy in patients previously assessed through computed tomography was carried out. Stone status was determined 3 weeks after treatment. The predictive yield of the Kim nomogram versus the reference study (computed tomography) was evaluated for predicting stone-free status. Bayesian statistics were performed to calculate the prevalence of stones after the test and the ROC curve analysis was carried out to determine the area under the curve for all values, as well as to report the 95% CI.  RESULTS: A total of 110 patients were included in the study. Extracorporeal lithotripsy showed a general efficacy of 69% and the nomogram analysis produced an area under the curve of 0.627. The number of stones and the maximum diameter were statistically significant variables for achieving the stone-free rate. Stone volume and Hounsfield units were also predictive in the final treatment result.  CONCLUSIONS: Extracorporeal shock wave lithotripsy is still an effective treatment for kidney stones. A better selection of patients that are candidates for said treatment can be made utilizing the predictive variables identified.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Nomograma]]></kwd>
<kwd lng="es"><![CDATA[litotricia extracorpórea]]></kwd>
<kwd lng="es"><![CDATA[litiasis renal]]></kwd>
<kwd lng="en"><![CDATA[Nomogram]]></kwd>
<kwd lng="en"><![CDATA[Extracorporeal lithotripsy]]></kwd>
<kwd lng="en"><![CDATA[Kidney stones]]></kwd>
</kwd-group>
</article-meta>
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