<?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>S1665-11462023000600331</article-id>
<article-id pub-id-type="doi">10.24875/bmhim.23000050</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Histological transitional zone pull-through in Hirschsprung disease. Postoperative functional results and current recommendations]]></article-title>
<article-title xml:lang="es"><![CDATA[Descenso en zona de transición histológica en la enfermedad de Hirschsprung. Resultados funcionales postoperatorios y recomendaciones actuales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torre]]></surname>
<given-names><![CDATA[Luis De-la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arnold]]></surname>
<given-names><![CDATA[Michael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lovell]]></surname>
<given-names><![CDATA[Mark]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[Diego]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bischoff]]></surname>
<given-names><![CDATA[Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wehrli]]></surname>
<given-names><![CDATA[Lea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Colorado School of Medicine, University of Colorado Division of Pediatric Surgery Department of Surgery, International Center for Colorectal and Urogenital Care]]></institution>
<addr-line><![CDATA[Colorado ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Departamento de Cirugía Pediátrica ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Colorado University of Colorado School of Medicine Department of Pathology, Children’s Hospital Colorado]]></institution>
<addr-line><![CDATA[Colorado ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>80</volume>
<numero>6</numero>
<fpage>331</fpage>
<lpage>338</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462023000600331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462023000600331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462023000600331&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Surgeons create a neorectum to repair patients with Hirschsprung´s disease (HD), which should be formed from a normoganglionic bowel. However, the neorectum is occasionally created with a transition zone (TZ) bowel. A neorectum created with a TZ has been postulated as a cause of postoperative enterocolitis or constipation. This study compares the incidence of enterocolitis and constipation in patients with TZ neorectum and normoganglionic bowel.  Methods: We conducted a retrospective review of patients with rectosigmoid HD who underwent primary pull-through. Patients were divided into normoganglionic neorectum (NNR) and TZ neorectum. The diagnosis was based on the final histopathologic report of the proximal margin. The incidence of enterocolitis and constipation was compared between these two groups.  Results: A total of 98 HD patients were analyzed. Seventy-one patients fulfilled the inclusion criteria. 65 (92%) had a NNR, and six patients (8%) had a TZ neorectum. From these patients, 42 (59%) presented with enterocolitis or constipation. However, there was no significant difference between both groups.  Conclusion: The present study showed no difference in the incidence of enterocolitis or postoperative constipation in HD patients with normoganglionic or TZ neorectum. These results suggest that TZ neorectum does not cause postoperative obstructive symptoms.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Los cirujanos crean un neo-recto para tratar a los pacientes con enfermedad de Hirschsprung (EH), que debe formarse con intestino normogangliónico; sin embargo, en ocasiones el neo-recto se forma con intestino de la zona de transición. Se ha postulado que un neo-recto en zona de transición causa enterocolitis o estreñimiento postoperatorio. El objetivo de este estudio fue comparar la frecuencia de enterocolitis y estreñimiento en pacientes con neo-recto en zona de transición y con neo-recto normogangliónico.  Métodos: Se llevó a cabo una revisión retrospectiva de pacientes con EH recto sigmoideo que se sometieron a descenso primario. Los pacientes se dividieron en el grupo neo-recto normogangliónico y el grupo con neo-recto en zona de transición. El diagnóstico del neo-recto se estableció con el informe histopatológico definitivo del margen proximal. Se comparó la frecuencia de enterocolitis y estreñimiento entre estos dos grupos.  Resultados: Se analizó un total de 98 pacientes con EH, de los cuales 71 pacientes cumplieron los criterios de inclusión; 65 (92%) con neo-recto normogangliónico y seis (8%) con neo-recto en zona de transición. Posteriormente, 42 (59%) pacientes presentaron enterocolitis asociada a Hirschsprung (HAEC) o estreñimiento; sin embargo, no hubo diferencia significativa entre ambos grupos.  Conclusiones: El presente estudio no demostró una diferencia en la frecuencia de HAEC o estreñimiento postoperatorio en pacientes con EH con neo-recto normogangliónico o en zona de transición. Estos resultados sugieren que un neo-recto en zona de transición no causa síntomas obstructivos postoperatorios.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hirschsprung disease]]></kwd>
<kwd lng="en"><![CDATA[Transition zone]]></kwd>
<kwd lng="en"><![CDATA[Hirschsprung-associated enterocolitis]]></kwd>
<kwd lng="en"><![CDATA[Hypertrophic nerves]]></kwd>
<kwd lng="en"><![CDATA[Pull-through]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad de Hirschsprung]]></kwd>
<kwd lng="es"><![CDATA[Zona de transición]]></kwd>
<kwd lng="es"><![CDATA[Enterocolitis asociada a Hirschsprung]]></kwd>
<kwd lng="es"><![CDATA[Nervios hipertróficos]]></kwd>
<kwd lng="es"><![CDATA[Descenso]]></kwd>
</kwd-group>
</article-meta>
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