<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462021000600536</article-id>
<article-id pub-id-type="doi">10.24875/bmhim.20000359</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Outcome of the treatment of hydronephrosis due to congenital ureteropelvic stenosis according to age at surgery]]></article-title>
<article-title xml:lang="es"><![CDATA[Resultados del tratamiento de la hidronefrosis por estenosis ureteropiélica congénita según la edad de la intervención]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zaragoza-Torres]]></surname>
<given-names><![CDATA[Raúl I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Méndez]]></surname>
<given-names><![CDATA[Álvaro de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baltazar-González]]></surname>
<given-names><![CDATA[Juan A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Venegas-Vázquez]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez Martínez]]></surname>
<given-names><![CDATA[Ricardo B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrera-de León]]></surname>
<given-names><![CDATA[Juan C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional de Occidente Hospital de Pediatría]]></institution>
<addr-line><![CDATA[Guadalajara Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Guadalajara Facultad de Medicina Coordinación de Ciclos Clínicos]]></institution>
<addr-line><![CDATA[Guadalajara Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional de Occidente Hospital de Pediatría]]></institution>
<addr-line><![CDATA[Guadalajara Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Guadalajara Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>78</volume>
<numero>6</numero>
<fpage>536</fpage>
<lpage>543</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462021000600536&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462021000600536&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462021000600536&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Congenital kidney and urinary tract anomalies are the most common cause of chronic kidney disease in the first three decades of life. Stenosis of the ureteropelvic junction may cause dilation of the collecting system in the fetal kidney. This study aimed to determine hydronephrosis due to congenital ureteropelvic stenosis treatment outcome according to the age of the intervention.  Methods: We conducted a retrospective descriptive study that included pediatric patients with hydronephrosis secondary to ureteropelvic junction stenosis operated by the Anderson-Hynes open pyeloplasty method from 2010 to 2016. Patients were divided into two groups: group A, children &lt; 1 year of age, and group B, children &gt; 1 year of age. We analyzed ultrasonographic parameters, renal function, and clinical data. Inferential statistics were used with the Mann-Whitney U-test and X2 test. Intra-group data were assessed with the Wilcoxon test.  Results: We included 52 patients: group A (n = 16, 30%) and group B (n = 36, 70%). The male sex predominated, and mainly the left renal unit. The most important surgical finding was stenotic segment. The median right glomerular filtration rate was 24.1 mL/min (19.0-34.5) pre-surgical and 38.2 mL/min (35.9-41.09) post-surgical in group A (p = 0.028), and 28.4 mL/min (18.5-35.0) pre-surgical and 37 mL/min (35.7-46.0) post-surgical in group B (p = 0.003). The median left glomerular filtration rate was 30 mL/min (21.4-39.0) pre-surgical and 40.0 mL/min (37.7-44.6) post-surgical in group A (p = 0.005) and 18.4 mL/min (14.2-29.2) pre-surgical and 37 mL/min (33.1-38.5) post-surgical in group B (p &lt; 0.001).  Conclusions: Correction of ureteropelvic stenosis before one year of age results in better renal function than a later correction.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Las anormalidades congénitas del riñón y del tracto urinario son la causa más frecuente de enfermedad renal crónica en las primeras décadas de la vida. La estenosis de la unión ureteropiélica puede ocasionar restricción del flujo urinario desde la pelvis renal hacia el uréter, y es la causa más común de dilatación del sistema colector en el riñón fetal. El objetivo de este estudio fue determinar los resultados del tratamiento de la hidronefrosis por estenosis ureteropiélica congénita según la edad de la intervención.  Métodos: Se llevó a cabo un estudio retrospectivo descriptivo incluyendo pacientes pediátricos con hidronefrosis secundaria a estenosis de la unión ureteropiélica sometidos a pieloplastia abierta de Anderson-Hynes en el periodo 2010-2016. Se formaron dos grupos: A, pacientes &lt; 1 año, y B, pacientes &gt; 1 año. Se analizaron parámetros clínicos, ecosonográficos y de función renal. Se utilizó estadística inferencial con las pruebas U de Mann Whitney, &#967;2 y Wilcoxon.  Resultados: Se incluyeron 52 pacientes: 16 en el grupo A (30%) y 36 en el grupo B (70%). Predominó el sexo masculino, y principalmente la unidad renal izquierda. El hallazgo quirúrgico más importante fue el segmento estenótico. La mediana de la tasa de filtración glomerular derecha prequirúrgica fue de 24.1 ml/min (19.0-34.5) y la posquirúrgica fue de 38.2 ml/min (35.9-41.09) en el grupo A (p = 0.028), frente a 28.4 ml/min (18.5-35.0) y 37 ml/min (35.7-46.0), respectivamente, en el grupo B (p = 0.003). La mediana de la tasa de filtración glomerular izquierda prequirúrgica fue de 30 ml/min (21.4-39.0) y la posquirúrgica fue de 40.0 ml/min (37.7-44.6) en el grupo A (p = 0.005), frente a 18.4 ml/min (14.2-29.2) y 37 ml/min (33.1-38.5), respectivamente, en el grupo B (p &lt; 0.001).  Conclusiones: La corrección de la estenosis ureteropiélica antes de 1 año de edad resulta en una mejor función renal que la corrección tardía.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pyeloplasty]]></kwd>
<kwd lng="en"><![CDATA[Hydronephrosis]]></kwd>
<kwd lng="en"><![CDATA[Ureteropyelic stenosis]]></kwd>
<kwd lng="es"><![CDATA[Pieloplastia]]></kwd>
<kwd lng="es"><![CDATA[Hidronefrosis]]></kwd>
<kwd lng="es"><![CDATA[Estenosis ureteropiélica]]></kwd>
</kwd-group>
</article-meta>
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