<?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>2448-8771</journal-id>
<journal-title><![CDATA[Anestesia en México]]></journal-title>
<abbrev-journal-title><![CDATA[Anest. Méx.]]></abbrev-journal-title>
<issn>2448-8771</issn>
<publisher>
<publisher-name><![CDATA[Federación Mexicana de Colegios de Anestesiología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-87712018000300038</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Administración intratecal en dosis mínima de morfina para el manejo del dolor postquirúrgico en cesárea]]></article-title>
<article-title xml:lang="en"><![CDATA[Intrathecal administration in minimal dose of morphine for postoperative pain management in caesarean section]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez Cardona]]></surname>
<given-names><![CDATA[Maria Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Alfredo Pumarejo Lafaurie  ]]></institution>
<addr-line><![CDATA[Matamoros Tamaulipas]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>38</fpage>
<lpage>46</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-87712018000300038&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-87712018000300038&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-87712018000300038&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La morfina intratecal se ha utilizado con muy buenos resultados en el tratamiento del dolor agudo. Múltiples dosis se han utilizado, tratando de encontrar la dosis óptima.  Objetivo:  Conocer la dosis optima de morfina para analgesia postoperatoria en pacientes operadas de cesárea, con mínimos efectos secundarios.  Material y método:  Se diseñó un ensayo clínico, prospectivo controlado y aleatorizado. Se incluyeron 100 pacientes de cesárea, para control del dolor postoperatorio, ASA I y II. El grupo uno formado por 50 pacientes que recibieron morfina intratecal 80 &#956;g, más bupivacaína hiperbárica 9 mg al 0.5%. El grupo dos, formado por 50 pacientes que recibieron lo mismo pero con 40 mg de morfina. Se cuantifico la incidencia de dolor por Escala visual análoga (EVA), nauseas, vómito y prurito, durante las siguientes 24 horas del postoperatorio. Se determinó el valor de (P &lt; 0.05).  Resultados:  La analgesia fue efectiva en ambos grupos. El prurito fue el síntoma más frecuente y está directamente relacionado a la dosis usada.  Conclusión:  La analgesia postoperatoria con morfina espinal, es el estándar de oro para el dolor agudo. Dosis bajas son mejores con la finalidad de evitar efectos secundarios graves. Lo mejor es no usar morfina como monoterapia postoperatoria, el mejor esquema es la analgesia multimodal y dosis de rescate.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract. Intrathecal morphine has been used, with good results in the treatment of acute pain. Multiple doses have been used, trying to find the optimal dose.  Objective:  To know the optimum dosage of morphine for postoperative analgesia in patients operated of Caesarea, with minimal side effects.  Material and method:  we designed randomized and controlled clinical, prospective trial. We included 100 patients of Cesarean section for postoperative pain control, ASA I and II. The one group of 50 patients, received intrathecal morphine 80 &#956;g, more 9 mg, 0.5% hyperbaric bupivacaine. Group two, of 50 patients, received the same but with 40 &#956;g of morphine. They quantified the incidence of pain by EVA, nausea, vomiting and pruritus, during the next postoperative 24 hours. The value of (P &lt; 0.05) was determined.  Results:  Analgesia was effective in both groups. The itching was the most frequent symptom and is directly related to the used dose.  Conclusion:  Postoperative analgesia with spinal morphine, is the &#8220;Gould standard&#8221; for acute pain. Low doses are better in order to avoid serious side effects. It is best not to use morphine postoperative monotherapy, the best scheme is multimodal analgesia and doses of rescue.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Morfina intratecal]]></kwd>
<kwd lng="es"><![CDATA[dolor postoperatorio]]></kwd>
<kwd lng="es"><![CDATA[cesárea]]></kwd>
<kwd lng="en"><![CDATA[Morphine intratecal]]></kwd>
<kwd lng="en"><![CDATA[postoperative pain]]></kwd>
<kwd lng="en"><![CDATA[cesarean section]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cortes-Blanco]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Analgesia post cesárea con morfina intratecal: 100 &#956;g vs 200 &#956;g]]></article-title>
<source><![CDATA[Anestesia en México]]></source>
<year>2005</year>
<volume>17</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>1-5</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García Estañón]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[López Jiménez]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparación entre morfina intratecal a dosis alta contra baja en cirugía de columna lumbar para control de dolor postoperatorio]]></article-title>
<source><![CDATA[Revista mexicana de Anestesiología]]></source>
<year>2008</year>
<volume>31</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>93-100</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dahl]]></surname>
<given-names><![CDATA[JB]]></given-names>
</name>
<name>
<surname><![CDATA[Jeppesen]]></surname>
<given-names><![CDATA[IS]]></given-names>
</name>
<name>
<surname><![CDATA[Jørgensen]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Intraoperative and postoperative analgesic efficacy and adverse effects of intrathecal opioids in patients undergoing cesarean section with spinal anesthesia: a qualitative and quantitative systematic review of randomized controlled trials]]></article-title>
<source><![CDATA[Anesthesiology]]></source>
<year>1999</year>
<volume>91</volume>
<page-range>1919 27</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Palmer]]></surname>
<given-names><![CDATA[CM]]></given-names>
</name>
<name>
<surname><![CDATA[Emerson]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Volgoropolous]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Dose response relationship of intrathecal morphine for postcesarean analgesia]]></article-title>
<source><![CDATA[Anesthesiology]]></source>
<year>1999</year>
<volume>90</volume>
<page-range>437-44</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Egydio de Carvalho]]></surname>
<given-names><![CDATA[FA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Tenorio Sergio B., Estudio comparativo entre dosis de morfina intratecal para analgesia después de la cesárea]]></article-title>
<source><![CDATA[Revista Brasileira de Anestesiologia]]></source>
<year>2013</year>
<volume>63</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>492-9</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Longnecker]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<source><![CDATA[Anesthesiology]]></source>
<year>2012</year>
<volume>42</volume>
<edition>Second</edition>
<page-range>704-12</page-range><publisher-name><![CDATA[The McGraw-Hill]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[Anestesia]]></source>
<year>2016</year>
<volume>31</volume>
<edition>8</edition>
<page-range>865-7</page-range><publisher-loc><![CDATA[España ]]></publisher-loc>
<publisher-name><![CDATA[Elsevier]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Coda]]></surname>
<given-names><![CDATA[BA]]></given-names>
</name>
<name>
<surname><![CDATA[Barash]]></surname>
<given-names><![CDATA[PG]]></given-names>
</name>
<name>
<surname><![CDATA[Cullen]]></surname>
<given-names><![CDATA[BF]]></given-names>
</name>
<name>
<surname><![CDATA[Stoetling]]></surname>
<given-names><![CDATA[RK]]></given-names>
</name>
</person-group>
<source><![CDATA[Anestesiología clínica. Opioides]]></source>
<year>2006</year>
<edition>4</edition>
<page-range>389-419</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Mc Graw- Hill interamericana]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Simpson]]></surname>
<given-names><![CDATA[JY]]></given-names>
</name>
</person-group>
<source><![CDATA[The collected works of James Young Simpson]]></source>
<year>1974</year>
<volume>2</volume>
<page-range>42-64</page-range><publisher-loc><![CDATA[Edimburgh ]]></publisher-loc>
<publisher-name><![CDATA[Adam and Charles Black]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Casillas-Sánchez]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Zepeda López]]></surname>
<given-names><![CDATA[VA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Analgesia Obstétrica Moderna]]></article-title>
<source><![CDATA[Revista Anestesia en México]]></source>
<year>2009</year>
<volume>21</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>20-4</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Delgado Ávila]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<source><![CDATA[Morfina intratecal para alivio del dolor en cesáreas de urgencias, monografías]]></source>
<year>2012</year>
</nlm-citation>
</ref>
<ref id="B12">
<label>12</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Torres Juan]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Uso de bupivacaína y morfina espinal para manejo del dolor postoperatorio en cirugía ginecológica]]></article-title>
<source><![CDATA[Revista Mexicana de Anestesiología]]></source>
<year>2001</year>
<volume>1</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>1-5</page-range></nlm-citation>
</ref>
<ref id="B13">
<label>13</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[Anestesia]]></source>
<year>2016</year>
<volume>98</volume>
<edition>8</edition>
<page-range>3441</page-range><publisher-loc><![CDATA[España ]]></publisher-loc>
<publisher-name><![CDATA[Elsevier]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<label>14</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Covarrubias-Gómez]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Silva Jiménez]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Nuche Cabrera]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Téllez Isaías]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[El manejo del dolor posoperatorio en obstetricia: ¿es seguro?]]></article-title>
<source><![CDATA[Rev. Mex Anest]]></source>
<year>2006</year>
<volume>29</volume>
<page-range>231-9</page-range></nlm-citation>
</ref>
<ref id="B15">
<label>15</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lacassie]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Dolor y embarazo]]></article-title>
<source><![CDATA[Rev. Med. Clin. Condes]]></source>
<year>2014</year>
<volume>25</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>641-50</page-range></nlm-citation>
</ref>
<ref id="B16">
<label>16</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Perena]]></surname>
<given-names><![CDATA[MJ]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Neuroanatomía del dolor]]></article-title>
<source><![CDATA[Revista española de anestesiología]]></source>
<year>2007</year>
<volume>II</volume>
<page-range>5-10</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>17</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Carrillo-Esper]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Dolor Agudo Posoperatorio]]></article-title>
<source><![CDATA[Clínicas Mexicanas de Anestesiología]]></source>
<year>2011</year>
<volume>13</volume>
</nlm-citation>
</ref>
<ref id="B18">
<label>18</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Granot]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Lowenstein]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Yarnitsky]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Tamir]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Zimmer]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Postcesarean section pain prediction by preoperative experimental pain assessment]]></article-title>
<source><![CDATA[Anesthesiology]]></source>
<year>2003</year>
<volume>98</volume>
<page-range>1422-6</page-range></nlm-citation>
</ref>
<ref id="B19">
<label>19</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[MacArthur]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Postpartum analgesia]]></article-title>
<source><![CDATA[Rev Mex Anest]]></source>
<year>2005</year>
<volume>28</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>S47-53</page-range></nlm-citation>
</ref>
<ref id="B20">
<label>20</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Colleau]]></surname>
<given-names><![CDATA[S M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluación de la escalera analgésica de la OMS en su 20° Aniversario]]></article-title>
<source><![CDATA[Cancer Press Release]]></source>
<year>2006</year>
<volume>19</volume>
<numero>2</numero>
<issue>2</issue>
</nlm-citation>
</ref>
<ref id="B21">
<label>21</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aldrete]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
</person-group>
<source><![CDATA[Texto de Anestesiología Teórica-práctica]]></source>
<year></year>
<edition>Segunda</edition>
<page-range>270-2</page-range></nlm-citation>
</ref>
<ref id="B22">
<label>22</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bejar]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Santiago]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Enrique]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudio Comparativo de Morfina Intratecal vs sistémica para analgesia posoperatoria en cesárea]]></article-title>
<source><![CDATA[Actas Peruanas de Anestesiología]]></source>
<year>2013</year>
<volume>21</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>20-1</page-range></nlm-citation>
</ref>
<ref id="B23">
<label>23</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baka]]></surname>
<given-names><![CDATA[NE]]></given-names>
</name>
<name>
<surname><![CDATA[Bayoumeu]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Boutroy]]></surname>
<given-names><![CDATA[MJ]]></given-names>
</name>
<name>
<surname><![CDATA[Laxenaire]]></surname>
<given-names><![CDATA[MC]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Colostrum morphine concentrations during postcesarean intravenous patient-controlled analgesia]]></article-title>
<source><![CDATA[Anesth Analg]]></source>
<year>2002</year>
<volume>94</volume>
<page-range>184-7</page-range></nlm-citation>
</ref>
<ref id="B24">
<label>24</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stoelting]]></surname>
<given-names><![CDATA[RK]]></given-names>
</name>
</person-group>
<source><![CDATA[Pharmacology and Physiology in Anesthetic Practice]]></source>
<year>2011</year>
</nlm-citation>
</ref>
<ref id="B25">
<label>25</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gehling]]></surname>
<given-names><![CDATA[MHG]]></given-names>
</name>
<name>
<surname><![CDATA[Luesebrink]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The effective duration of analgesia after intrathecal morphine in patients without additional opioid analgesia: a randomized double-blind multicentre study on orthopaedic patients]]></article-title>
<source><![CDATA[European Journal of Anaesthesiology]]></source>
<year>2009</year>
<volume>26</volume>
<page-range>683-8</page-range></nlm-citation>
</ref>
<ref id="B26">
<label>26</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kuipers]]></surname>
<given-names><![CDATA[WP]]></given-names>
</name>
<name>
<surname><![CDATA[Kamphuis Ed]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Intrathecal Opioids and Lower Urinary Tract Function A Urodynamic Evaluation]]></article-title>
<source><![CDATA[Anesthesiology]]></source>
<year>2004</year>
<volume>100</volume>
<page-range>1497-503</page-range></nlm-citation>
</ref>
<ref id="B27">
<label>27</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Urbina Peralta]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Eficacia de la Morfina vía subaracnoidea en la analgesia postoperatoria de la histerectomía total abdominal y vaginal]]></article-title>
<source><![CDATA[Actas Perú Anestesiol]]></source>
<year>2012</year>
<volume>20</volume>
<page-range>92-7</page-range></nlm-citation>
</ref>
<ref id="B28">
<label>28</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mugabure B]]></surname>
<given-names><![CDATA[Echaniz E]]></given-names>
</name>
<name>
<surname><![CDATA[Marín]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fisiología y farmacología clínica de los opioides epidurales e intratecales]]></article-title>
<source><![CDATA[Rev. Soc. Esp. Dolor]]></source>
<year>2005</year>
<volume>12</volume>
<page-range>33-45</page-range></nlm-citation>
</ref>
<ref id="B29">
<label>29</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Córdova]]></surname>
<given-names><![CDATA[AJ]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[FP]]></given-names>
</name>
<name>
<surname><![CDATA[Nava]]></surname>
<given-names><![CDATA[LE]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Analgesia postcesárea con sulfato de morfina en infusión peridural]]></article-title>
<source><![CDATA[Rev. Mex Anest]]></source>
<year>1999</year>
<volume>22</volume>
<page-range>238-42</page-range></nlm-citation>
</ref>
<ref id="B30">
<label>30</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pitkänen]]></surname>
<given-names><![CDATA[MT]]></given-names>
</name>
<name>
<surname><![CDATA[Niemi]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of tropisetron, A 5 - HT receptor antagonist, on analgesia and nausea after intrathecal morphine]]></article-title>
<source><![CDATA[British Journal Of Anaesthesia]]></source>
<year>1993</year>
<volume>71</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>681-4</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
