<?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>1870-7203</journal-id>
<journal-title><![CDATA[Acta médica Grupo Ángeles]]></journal-title>
<abbrev-journal-title><![CDATA[Acta méd. Grupo Ángeles]]></abbrev-journal-title>
<issn>1870-7203</issn>
<publisher>
<publisher-name><![CDATA[Grupo Ángeles, Servicios de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-72032017000100025</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Localización adecuada del espacio intervertebral L3-L4 por palpación según el ultrasonido en voluntarios sanos]]></article-title>
<article-title xml:lang="en"><![CDATA[Adequate location of the intervertebral space L3-L4 by palpation according to ultrasound in healthy volunteers]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz Arroyo]]></surname>
<given-names><![CDATA[Lorena Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Athié García]]></surname>
<given-names><![CDATA[José Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Rosete]]></surname>
<given-names><![CDATA[Vicente Adalberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Cruz]]></surname>
<given-names><![CDATA[Francisco Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad La Salle Facultad Mexicana de Medicina ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Ángeles Mocel  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Hospital Ángeles Mocel  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<volume>15</volume>
<numero>1</numero>
<fpage>25</fpage>
<lpage>31</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-72032017000100025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-72032017000100025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-72032017000100025&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  La técnica más usada para localizar el espacio intervertebral L3-L4 para bloqueo neuroaxial es la palpación.  Objetivo:  Determinar con ultrasonido la proporción de localización adecuada del espacio L3-L4 por palpación, establecer la proporción de &#8220;nivel arriba&#8221; y &#8220;abajo&#8221;, evaluar la asociación entre el índice de masa corporal y la localización inexacta.  Métodos:  Se estudiaron 100 voluntarios sanos de 18 a 75 años; en decúbito lateral izquierdo se procedió a localizar por palpación el espacio intervertebral L3-L4 y se colocó una marca; sin mover al paciente, con la sonda de ultrasonido lineal, se localizaron la apófisis de T12 y el borde superior del sacro, y contando las apófisis espinosas, se identificó el espacio intervertebral marcado.  Resultados:  En 68% de las evaluaciones, la localización por referencias anatómicas era adecuada; el 75% de las ocasiones la marca estaba un &#8220;nivel arriba&#8221; y 25% un &#8220;nivel abajo&#8221;; a mayor índice de masa, mayor inexactitud en la localización de este espacio.  Conclusiones:  La localización del espacio intervertebral L3-L4 por palpación tuvo una inexactitud del 32% corroborada por ultrasonido. El mayor índice de masa corporal incrementó la inexactitud de la localización de L3-L4 por palpación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  The most commonly used technique to locate the intervertebral space L3-L4 for neuraxial blockade is palpation.  Objective:  To determine with ultrasound the ratio of adequate location of the L3-L4 space by palpation, setting the proportion of &#8220;level above&#8221; and &#8220;below&#8221;, and to evaluate the association between body mass index and inaccurate location.  Methods:  100 healthy volunteers aged 18 to 75 years were studied; in the left lateral decubitus, we proceeded to locate by manual palpation the intervertebral space L3-L4 and placed a mark; without moving the patient, with the linear ultrasound probe, the processes of T12 and the top edge of the sacrum were located, and counting the spinous processes, we identified the previously marked intervertebral space.  Results:  In 68% of the evaluations, the mark was adequate; in 75% of these, the landmark was a &#8220;level above&#8221;, and in 25%, a &#8220;level below&#8221;; the greater the body mass index, the greater the inaccuracy in locating this space.  Conclusions:  The location of the L3-L4 intervertebral space by manual palpation had a 32% inaccuracy confirmed by ultrasound. A higher body mass index increased the inaccuracy of the location of L3-L4 by palpation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Espacio intervertebral]]></kwd>
<kwd lng="es"><![CDATA[bloqueo neuroaxial lumbar]]></kwd>
<kwd lng="en"><![CDATA[Location of the intervertebral space]]></kwd>
<kwd lng="en"><![CDATA[lumbar neuraxial blockade]]></kwd>
</kwd-group>
</article-meta>
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