<?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>2011-7582</journal-id>
<journal-title><![CDATA[Revista Colombiana de Cirugía]]></journal-title>
<abbrev-journal-title><![CDATA[rev. colomb. cir.]]></abbrev-journal-title>
<issn>2011-7582</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Cirugía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2011-75822012000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[¿Se debe fijar la malla durante una herniorrafia inguinal?]]></article-title>
<article-title xml:lang="en"><![CDATA[Should mesh prosthesis be fixed in inguinal herniorraphy?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez]]></surname>
<given-names><![CDATA[Luis Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sanabria]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega]]></surname>
<given-names><![CDATA[Neil Valentín]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Osorio]]></surname>
<given-names><![CDATA[Camilo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de La Sabana  ]]></institution>
<addr-line><![CDATA[Chía ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Pontificia Universidad Javeriana  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Fundación Abood Shaio  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2012</year>
</pub-date>
<volume>27</volume>
<numero>3</numero>
<fpage>202</fpage>
<lpage>212</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S2011-75822012000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S2011-75822012000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S2011-75822012000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción. La fijación de la malla durante una herniorrafia inguinal ha sido recomendada rutinariamente. La información disponible es controversial. En este estudio se hace una revisión crítica de la literatura científica, evaluando la efectividad clínica de esta intervención en cirugía laparoscópica y abierta (técnica de Lichtenstein). Métodos. Se hizo una búsqueda de la literatura científica siguiendo la metodología BET (Best Evidence Topic), para identificar artículos que compararan fijar contra no fijar la malla durante una herniorrafia inguinal. Los artículos se revisaron según los criterios de apreciación de la Journal of the American Medical Association (JAMA). Se extrajeron los datos de la efectividad de la intervención y se analizaron resultados primarios como reproducción, dolor posoperatorio, infección, seroma y hematoma. Se analizaron como resultados secundarios costo, tiempo de estancia hospitalaria, retorno laboral y tiempo quirúrgico. Resultados. Se encontraron una revisión sistemática de la literatura científica y nueve estudios de asignación aleatoria. En herniorrafia totalmente extraperitoneal, transabdominal preperitoneal y abierta, no existe diferencia en la frecuencia de reproducción, infección, seroma ni hematoma. La presencia de dolor posoperatorio disminuye tardíamente cuando no se fija la malla, tanto en herniorrafia abierta como laparoscópica. En herniorrafia laparoscópica el tiempo de incapacidad no disminuye si se fija la malla. Fijar la malla incrementa el costo y el tiempo quirúrgico. Conclusiones. La fijación de la malla puede omitirse en herniorrafia laparoscópica totalmente extraperitoneal, en la transabdominal preperitoneal y en la abierta por vía anterior (Lichtenstein). La principal ventaja de no fijar la malla, documentada en los estudios disponibles, tiene que ver con la reducción del dolor posoperatorio crónico, sin que exista diferencia en la tasa de reproducción. No hay información disponible sobre esta intervención en otros tipos de herniorrafia abierta, como la preperitoneal (Nyhus).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction / aims: Mesh fixation in groin hernia repair has been recommended routinely; however there is pertinent controversial information. In this study we review the clinical effectiveness of the intervention in open (Lichtenstein repair) and laparoscopic repair. Methods: We used a Best Bets methodology to identify clinical trials comparing mesh fixation versus no mesh fixation during inguinal herniorraphy. Studies were evaluated according with JAMA criteria. Information about clinical effectiveness was extracted from articles, and we considered as primary outcomes the recurrence rate, postoperative pain, and development of infection, seroma, and hematoma. Secondary outcomes were cost, length of stay, operating time, and return to labor activity. Results: One systematic review and nine RCT were identified. In TEP, TAPP and open repair there is no difference in the recurrence rate or in the development of infection, seroma, and hematoma. Postoperative pain decreases when mesh is unfixed in both repairs. For laparoscopic repair the time to return labor activity is not modified under mesh fixation. Fixation increases cost and operative time. Conclusions: Fixation could be omitted during laparoscopic and Lichtenstein repair. Main advantage of non fixation is related to the reduction of postoperative pain, with no modifications in recurrence rate. There is no information regarding other surgical techniques such as the preperitoneal repair (Nyhus procedure).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hernia inguinal]]></kwd>
<kwd lng="es"><![CDATA[prótesis e implantes]]></kwd>
<kwd lng="es"><![CDATA[mallas quirúrgicas]]></kwd>
<kwd lng="es"><![CDATA[dispositivos de fijación quirúrgicos]]></kwd>
<kwd lng="es"><![CDATA[dolor posoperatorio]]></kwd>
<kwd lng="en"><![CDATA[hernia]]></kwd>
<kwd lng="en"><![CDATA[inguinal]]></kwd>
<kwd lng="en"><![CDATA[prostheses and implants]]></kwd>
<kwd lng="en"><![CDATA[surgical mesh]]></kwd>
<kwd lng="en"><![CDATA[surgical fixation devices]]></kwd>
<kwd lng="en"><![CDATA[pain]]></kwd>
<kwd lng="en"><![CDATA[postoperative]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">      <p><font size="4" face="Verdana">     <center><b>&iquest;Se debe fijar la malla durante una herniorrafia inguinal?</b></center></font></p> <font size="3" face="Verdana">     <center><b>Should mesh prosthesis be fixed in inguinal herniorraphy?</b></center></font>     <p>    <center>Luis Carlos Dom&iacute;nguez<sup>1,2</sup>, &Aacute;lvaro Sanabria<sup>1</sup>, Neil Valent&iacute;n Vega<sup>1</sup>, Camilo Osorio<sup>1</sup></center></p>     <p><sup>1</sup> 	Grupo de Patolog&iacute;a Quir&uacute;rgica, Universidad de La Sabana, Ch&iacute;a, Colombia.    <br> <sup>2</sup> 	Departamento de Cirug&iacute;a, Pontificia Universidad Javeriana, Hospital Universitario San Ignacio, Bogot&aacute;, D.C., Colombia.    <br> <sup>3</sup> 	Fundaci&oacute;n Abood Shaio, Bogot&aacute;, D.C., Colombia.</p>     <p><b>Correspondencia</b>: Luis Carlos Dom&iacute;nguez, MD, Bogot&aacute;, D.C., Colombia.    Correo electr&oacute;nico:  <a href="carlos.dominguez@unisabana.edu.co" target="_blank">carlos.dominguez@unisabana.edu.co</a></p>   Fecha de recibido: 9 de noviembre de 2011.  Fecha de aprobaci&oacute;n: 26 de abril de 2012. <hr size> <font size="3" face="Verdana"> <b>Resumen</b></font>       ]]></body>
<body><![CDATA[<p><b><i>Introducci&oacute;n</i></b>. La fijaci&oacute;n de la malla durante una herniorrafia inguinal ha sido recomendada rutinariamente. La informaci&oacute;n disponible es controversial. En este estudio se hace una revisi&oacute;n cr&iacute;tica de la literatura cient&iacute;fica, evaluando la efectividad cl&iacute;nica de esta intervenci&oacute;n en cirug&iacute;a laparosc&oacute;pica y abierta (t&eacute;cnica de Lichtenstein). </p>       <p><b><i>M&eacute;todos</i></b>. Se hizo una b&uacute;squeda de la literatura cient&iacute;fica siguiendo la metodolog&iacute;a BET (Best Evidence Topic), para identificar art&iacute;culos que compararan fijar contra no fijar la malla durante una herniorrafia inguinal. Los art&iacute;culos se revisaron seg&uacute;n los criterios de apreciaci&oacute;n de la Journal of the American Medical Association (JAMA). Se extrajeron los datos de la efectividad de la intervenci&oacute;n y se analizaron resultados primarios como reproducci&oacute;n, dolor posoperatorio, infecci&oacute;n, seroma y hematoma. Se analizaron como resultados secundarios costo, tiempo de estancia hospitalaria, retorno laboral y tiempo quir&uacute;rgico.</p>     <p><b><i>Resultados</i></b>. Se encontraron una revisi&oacute;n sistem&aacute;tica de la literatura cient&iacute;fica y nueve estudios de asignaci&oacute;n aleatoria. En herniorrafia totalmente extraperitoneal, transabdominal preperitoneal y abierta, no existe diferencia en la frecuencia de reproducci&oacute;n, infecci&oacute;n, seroma ni hematoma. La presencia de dolor posoperatorio disminuye tard&iacute;amente cuando no se fija la malla, tanto en herniorrafia abierta como laparosc&oacute;pica. En herniorrafia laparosc&oacute;pica el tiempo de incapacidad no disminuye si se fija la malla. Fijar la malla incrementa el costo y el tiempo quir&uacute;rgico. </p>       <p><b><i>Conclusiones</i></b>. La fijaci&oacute;n de la malla puede omitirse en herniorrafia laparosc&oacute;pica totalmente extraperitoneal, en la transabdominal preperitoneal y en la abierta por v&iacute;a anterior (Lichtenstein). La principal ventaja de no fijar la malla, documentada en los estudios disponibles, tiene que ver con la reducci&oacute;n del dolor posoperatorio cr&oacute;nico, sin que exista diferencia en la tasa de reproducci&oacute;n. No hay informaci&oacute;n disponible sobre esta intervenci&oacute;n en otros tipos de herniorrafia abierta, como la preperitoneal (Nyhus).</p>     <p><b><i>Palabras clave</i></b>: hernia inguinal; pr&oacute;tesis e implantes; mallas quir&uacute;rgicas; dispositivos de fijaci&oacute;n quir&uacute;rgicos; dolor posoperatorio.</p> <hr size> <font size="3" face="Verdana">  <b>Abstract</b></font>     <p> <i><b>Introduction / aims</b></i>: Mesh fixation in groin hernia repair has been recommended routinely; however there is pertinent controversial information. In this study we review the clinical effectiveness of the intervention in open (Lichtenstein repair) and laparoscopic repair. </p>     <p> <i><b>Methods</b></i>: We used a Best Bets methodology to identify clinical trials comparing mesh fixation versus no mesh fixation during inguinal herniorraphy. Studies were evaluated according with JAMA criteria. Information about clinical effectiveness was extracted from articles, and we considered as primary outcomes the recurrence rate, postoperative pain, and development of infection, seroma, and hematoma. Secondary outcomes were cost, length of stay, operating time, and return to labor activity. </p>         <p><b><i>Results</i></b>: One systematic review and nine RCT were identified. In TEP, TAPP and open repair there is no difference in the recurrence rate or in the development of infection, seroma, and hematoma. Postoperative pain decreases when mesh is unfixed in both repairs. For laparoscopic repair the time to return labor activity is not modified under mesh fixation. Fixation increases cost and operative time. </p>     <p> <i><b>Conclusions</b></i>: Fixation could be omitted during laparoscopic and Lichtenstein repair. Main advantage of non fixation is related to the reduction of postoperative pain, with no modifications in recurrence rate.  There is no information regarding other surgical techniques such as the preperitoneal repair (Nyhus procedure).</p>     <p> <i><b>Key words</b></i>: hernia, inguinal; prostheses and implants; surgical mesh; surgical fixation devices; pain, postoperative.</p> <hr size> <font size="3" face="Verdana"> <b>Introducci&oacute;n</b></font>       ]]></body>
<body><![CDATA[<p>Desde el advenimiento del procedimiento libre de tensi&oacute;n y del uso de materiales prot&eacute;sicos para la herniorrafia inguinal, la fijaci&oacute;n de la malla a las estructuras &oacute;seas y musculares de la regi&oacute;n p&eacute;lvica ha sido recomendada rutinariamente, siendo uno de los pasos fundamentales de la t&eacute;cnica quir&uacute;rgica. Los resultados obtenidos en estudios para evaluar la incorporaci&oacute;n de la malla al tejido y la reacci&oacute;n inflamatoria cr&oacute;nica se produce sin necesidad de fijaci&oacute;n, admitiendo una baja probabilidad de desplazamiento de la pr&oacute;tesis y una baja tasa de reproducci&oacute;n, promueven el cuestionamiento de este paso durante el procedimiento <sup>1-4</sup>. </p>       <p>En la actualidad, si bien la reproducci&oacute;n de la hernia es un desenlace trascendental, a partir de la teor&iacute;a quir&uacute;rgica que incorpora la cirug&iacute;a por laparoscopia y tras la introducci&oacute;n de los nuevos tipos de materiales prot&eacute;sicos, otros resultados, como la calidad de vida, el dolor posoperatorio en reposo y ejercicio, la sensaci&oacute;n de cuerpo extra&ntilde;o y el tiempo de incapacidad y de retorno laboral, han adquirido una especial relevancia. La forma en la que estos resultados se modifican, bien sea por cambios en la t&eacute;cnica o en los materiales utilizados, ha abierto un interesante debate sobre la necesidad rutinaria de fijaci&oacute;n de la malla, en especial, durante el procedimiento laparosc&oacute;pico totalmente extraperitoneal y transabdominal preperitoneal y, recientemente, en la cirug&iacute;a abierta por v&iacute;a anterior al conducto inguinal. Teniendo en cuenta que la informaci&oacute;n al respecto es controversial, en este estudio se eval&uacute;a la informaci&oacute;n disponible sobre fijaci&oacute;n contra no fijaci&oacute;n de la malla en herniorrafia laparosc&oacute;pica y abierta para el tratamiento de la hernia inguinal.</p>   <font size="3" face="Verdana"> <b>Materiales y m&eacute;todos</b></font>       <p>El dise&ntilde;o de estudio se basa en la metodolog&iacute;a BET (<i>Best Evidence Topic</i>), desarrollada por el <i>Manchester Royal Infirmary Emergency Department</i> del Reino Unido <sup>5</sup>. </p>       <p>Inicialmente, se hizo una b&uacute;squeda bibliogr&aacute;fica en las bases de datos <i>Medline, Pubmed, Scopus, Embase, Cochrane</i> y <i>Ovid</i>, con el objetivo de encontrar revisiones sistem&aacute;ticas de la literatura/metaan&aacute;lisis y estudios de asignaci&oacute;n aleatoria publicados en idioma ingl&eacute;s o espa&ntilde;ol, entre enero de 1990 y junio de 2011, utilizando los t&eacute;rminos <i>fixation, unfixation, mesh, groin hernia, inguinal hernia, surgery</i> y <i>therapy</i>. La b&uacute;squeda se extendi&oacute; en cada art&iacute;culo relevante utilizando operadores booleanos y referencias cruzadas para encontrar otros art&iacute;culos.</p>       <p>Se incluyeron los estudios que compararon la fijaci&oacute;n contra la no fijaci&oacute;n de la malla en la herniorrafia laparosc&oacute;pica (totalmente extraperitoneal y transabdominal preperitoneal) y abierta en pacientes adultos con hernia primaria unilateral, primaria bilateral, recurrente, directa, indirecta, femoral o mixta. Se excluyeron estudios que compararan diversos tipos de fijaci&oacute;n (suturas, pegantes biol&oacute;gicos, grapas), hernia ventral y poblaci&oacute;n pedi&aacute;trica. </p>       <p>Cada art&iacute;culo se evalu&oacute; cr&iacute;ticamente de acuerdo con las recomendaciones de la <i>Journal of the American Medical Association</i> (JAMA) <sup>6-8</sup>. Se establecieron tres grupos de evaluaci&oacute;n: 1) totalmente extraperitoneal, 2) transabdominal preperitoneal y 3) cirug&iacute;a abierta, y dos tipos de resultados: 1) primarios: tasa de reproducci&oacute;n, tasa global de complicaciones, incluida la de infecci&oacute;n del sitio operatorio, seroma, hematoma, dolor posoperatorio, evaluada mediante escala visual an&aacute;loga, y presencia de dolor cr&oacute;nico y, 2) secundarios: costo, tiempo operatorio, estancia hospitalaria y de retorno laboral e incapacidad. Con la informaci&oacute;n obtenida se obtuvo una conclusi&oacute;n y se hizo una recomendaci&oacute;n para aplicarla en la pr&aacute;ctica cl&iacute;nica.</p> <font size="3" face="Verdana"> <b>Resultados</b></font>       <p>En la b&uacute;squeda inicial se encontr&oacute; una revisi&oacute;n sistem&aacute;tica de la literatura/metaan&aacute;lisis y nueve estudios de asignaci&oacute;n aleatoria relevantes (<a href="img/revistas/rcci/v27n3/v27n3a5t1.gif" target="_new">tabla 1</a>).</p>       <p><b><i>Cirug&iacute;a laparosc&oacute;pica: herniorrafia totalmente extraperitoneal</i></b></p>       <p>Una revisi&oacute;n sistem&aacute;tica de la literatura/metaan&aacute;lisis<sup>  9</sup>  y cinco estudios de asignaci&oacute;n aleatoria fueron dise&ntilde;ados para evaluar esta intervenci&oacute;n <sup>10-14</sup>.  En todos los estudios de asignaci&oacute;n aleatoria se emple&oacute; herniorrafia con malla de alta densidad fijada con grapadora endosc&oacute;pica. En la revisi&oacute;n sistem&aacute;tica de la literatura/metaan&aacute;lisis <sup>9</sup>  no se document&oacute; una diferencia estad&iacute;sticamente significativa en la tasa de reproducci&oacute;n. Solamente en uno de los estudios se encontr&oacute; mayor incidencia de recurrencia cuando no se fij&oacute; la malla (no fijaci&oacute;n: 3,5 %; fijaci&oacute;n: 0; p=0,1) <sup>14</sup>. En uno de los estudios se evalu&oacute; la frecuencia de hematoma, sin que se demostrara una diferencia significativa (fijaci&oacute;n: 11,7 %; no fijaci&oacute;n: 12,7 %; p=0,3) <sup>14</sup>. En todos los estudios no hubo diferencia en la incidencia de seroma. En todos los estudios no se demostraron diferencias en la tasa de infecci&oacute;n del sitio operatorio. En cuanto al dolor posoperatorio evaluado por escala visual an&aacute;loga (tabla 2), en la revisi&oacute;n sistem&aacute;tica 9  no se encontraron diferencias entre el primero y el s&eacute;ptimo d&iacute;a. En un estudio de asignaci&oacute;n aleatoria <sup>14</sup> tampoco se documentaron diferencias al primer mes posoperatorio. Sin embargo, en uno de los estudios, la tasa de dolor cr&oacute;nico (mayor de seis meses) fue significativamente menor cuando no se fij&oacute; la malla (fijaci&oacute;n: 38 %; no fijaci&oacute;n: 23 %; p=0,003) <sup>13</sup>. </p>       <p>Respecto a los resultados secundarios, el costo fue significativamente mayor cuando se us&oacute; fijaci&oacute;n <sup>10,13,14</sup>. En un estudio se document&oacute; una menor tasa de estancia hospitalaria cuando no se fij&oacute; la malla (p&lt;0,003) <sup>9</sup> . No hubo diferencia en cuanto al tiempo de incapacidad y el retorno laboral en dos de los estudios <sup>10,11</sup> y en la revisi&oacute;n sistem&aacute;tica 9 ; no obstante, en uno de los estudios se document&oacute; que a la cuarta semana posoperatoria el 80 % de los pacientes sin fijaci&oacute;n hab&iacute;an retornado a sus actividades, frente a 60 % de los sometidos a fijaci&oacute;n (p=0,24) <sup>12</sup>. En la revisi&oacute;n sistem&aacute;tica se encontr&oacute; que el tiempo operatorio es menor cuando no se fija la malla (p&lt;0,02), dato encontrado tambi&eacute;n en tres de los estudios de asignaci&oacute;n aleatoria <sup>10,12,13</sup>. La informaci&oacute;n sobre resultados primarios y secundarios se encuentra en las tablas <a href="img/revistas/rcci/v27n3/v27n3a5t2.gif" target="_new">2</a> y <a href="img/revistas/rcci/v27n3/v27n3a5t3.gif" target="_new">3</a>. </p>     ]]></body>
<body><![CDATA[<p><b><i>Cirug&iacute;a laparosc&oacute;pica: herniorrafia transabdominal preperitoneal</i></b></p>       <p>Dos estudios de asignaci&oacute;n aleatoria fueron dise&ntilde;ados para evaluar esta intervenci&oacute;n <sup>15,16</sup>. En ambos se emple&oacute; la herniorrafia con malla de alta densidad fijada con grapadora endosc&oacute;pica y uno de ellos fue dise&ntilde;ado en tres brazos para comparar la fijaci&oacute;n con grapas (<i>tackers</i>), versus la fijaci&oacute;n con sutura no absorbible versus no fijaci&oacute;n <sup>16</sup>. En ambos se evidenci&oacute; una mayor incidencia de recurrencia, no estad&iacute;sticamente significativa cuando se fij&oacute; la malla (fijaci&oacute;n: 0,8 a 1 %; sin fijaci&oacute;n: 0). En ninguno se evalu&oacute; la frecuencia de hematoma. En uno <sup>15</sup>, la tasa de seroma fue menor cuando no se fij&oacute; la malla (no fijaci&oacute;n: 9,1 %; fijaci&oacute;n: 12,8 %; p=0,13). No se encontr&oacute; diferencia en la tasa de infecci&oacute;n del sitio operatorio. En cuanto al dolor posoperatorio evaluado por la escala visual an&aacute;loga (tabla 2), en un estudio <sup>16</sup> se document&oacute; disminuci&oacute;n en la puntuaci&oacute;n de la escala al sexto y al d&eacute;cimosegundo mes posoperatorio, sin encontrar diferencia entre la fijaci&oacute;n con sutura o grapas (tackers) versus no fijaci&oacute;n. </p>     <p>Respecto a los resultados secundarios, no se encontr&oacute; informaci&oacute;n sobre costo ni estancia hospitalaria. En un estudio de asignaci&oacute;n aleatoria no se encontr&oacute; diferencia en el tiempo de retorno laboral (fijaci&oacute;n: 12 d&iacute;as; no fijaci&oacute;n: 13 d&iacute;as) <sup>15</sup>. En uno se document&oacute; mayor tiempo operatorio con fijaci&oacute;n con sutura respecto a no fijaci&oacute;n y a grapas (tackers) <sup>16</sup>. La informaci&oacute;n sobre resultados primarios y secundarios se encuentra en las tablas 2 y 3. </p>     <p><b><i>Cirug&iacute;a abierta: t&eacute;cnica de Lichtenstein</i></b></p>       <p>Dos estudios de asignaci&oacute;n aleatoria fueron dise&ntilde;ados para evaluar esta intervenci&oacute;n <sup>17,18</sup>. En ambos se emplearon mallas de alta densidad fijadas con monofilamento contra mallas de baja densidad de autofijaci&oacute;n. La tasa de recurrencia, evaluada en uno de ellos, fue de cero en ambos grupos. No se document&oacute; diferencia en la tasa de hematoma <sup>17,18</sup>. En un estudio no hubo diferencia en la incidencia de seroma <sup>18</sup>. En el otro, se document&oacute; incidencia mayor de infecci&oacute;n del sitio operatorio con la malla de autofijaci&oacute;n (fijaci&oacute;n: 0; sin fijaci&oacute;n: 4,1 %). En la evaluaci&oacute;n de dolor posoperatorio por la escala visual an&aacute;loga (tabla 2), en uno de los estudios  <sup>18</sup> no se encontraron diferencias entre el primero y el s&eacute;ptimo d&iacute;a a favor de ninguna de las intervenciones; no obstante, en el otro <sup>17</sup> fue menor la puntuaci&oacute;n de dolor en la escala al sexto mes, a favor de la t&eacute;cnica de autofijaci&oacute;n (p=0,07). </p>       <p>Respecto a los resultados secundarios, el costo fue significativamente mayor cuando se emple&oacute; la malla de autofijaci&oacute;n <sup>18</sup>. En un estudio no se documentaron diferencias en el tiempo de estancia hospitalaria <sup>18</sup>. No existe informaci&oacute;n sobre el tiempo de retorno laboral y la incapacidad. El tiempo operatorio fue menor cuando no se fij&oacute; la malla <sup>17,18</sup>. La informaci&oacute;n sobre resultados primarios y secundarios se encuentra en las tablas <a href="img/revistas/rcci/v27n3/v27n3a5t2.gif" target="_new">2</a> y <a href="img/revistas/rcci/v27n3/v27n3a5t3.gif" target="_blank">3</a>. </p> <font size="3" face="Verdana"> <b>Discusi&oacute;n</b></font>       <p>Es controversial la necesidad de fijar la malla durante una herniorrafia inguinal. La l&oacute;gica quir&uacute;rgica indica que hacerlo podr&iacute;a garantizar la suficiente superposici&oacute;n del material al defecto, limitando la tasa de reproducci&oacute;n. No obstante, la informaci&oacute;n actual cuestiona este paso como estrategia para disminuir la reproducci&oacute;n y su efecto en otros resultados cl&iacute;nicos, particularmente en relaci&oacute;n con el dolor posoperatorio y la calidad de vida. </p>       <p>En algunos estudios no experimentales, se ha encontrado que la fijaci&oacute;n inadecuada de la malla por v&iacute;a laparosc&oacute;pica <sup>4,19-22</sup> y abierta <sup>23</sup>, es un factor que incrementa la tasa de reproducci&oacute;n. Incluso, en este &uacute;ltimo grupo, la fijaci&oacute;n con suturas absorbibles de corta duraci&oacute;n puede incrementar la tasa de reproducci&oacute;n en relaci&oacute;n con suturas de larga duraci&oacute;n (RR: 2,23; IC95% 1,67-2,99; p&lt;0,001) <sup>24</sup>. No obstante, en otros estudios no se ha demostrado tal asociaci&oacute;n <sup>25-27</sup>. Los resultados de la presente revisi&oacute;n indican que, cuando se utiliza la herniorrafia laparosc&oacute;pica totalmente extraperitoneal, la transabdominal preperitoneal o la abierta (Lichtenstein), la tasa de recurrencia es igual si se fija o no se fija la malla, por lo que podr&iacute;a intuirse que este resultado se relaciona con otros factores. Al respecto, la inexperiencia del cirujano, la disecci&oacute;n inadecuada, el tama&ntilde;o insuficiente de la pr&oacute;tesis para el defecto, la hernia olvidada y el desplazamiento secundario a la formaci&oacute;n de un hematoma en relaci&oacute;n con la malla, son factores diferentes a la fijaci&oacute;n de la malla que se han encontrado<sup> 23,28,29</sup>. </p>       <p>A la par, en relaci&oacute;n con la incidencia de dolor posoperatorio, en varios estudios se ha establecido que no fijar la malla puede inducir complicaciones neurop&aacute;ticas secundarias a la lesi&oacute;n traum&aacute;tica de los nervios de la pared abdominal en la regi&oacute;n inguinal <sup>30-32</sup>. En este sentido, diferentes autores recomiendan no fijar la malla como una de las estrategias de prevenci&oacute;n del dolor posoperatorio <sup>25-27</sup>. Los datos que sustentan esta revisi&oacute;n indican que, cuando se emplea la herniorrafia laparosc&oacute;pica totalmente extraperitoneal, la transabdominal preperitoneal o la abierta por t&eacute;cnica de Lichtenstein y no se fija la malla, puede existir un beneficio tard&iacute;o (luego del sexto mes de la cirug&iacute;a) en cuanto a la reducci&oacute;n del dolor respecto a la fijaci&oacute;n <sup>13,16,17</sup>, sin que se documenten diferencias en el dolor temprano, evaluado por la escala visual an&aacute;loga en estos tres tipos de herniorrafia. Igualmente, existe una diferencia importante en el dolor posoperatorio que no depende solamente de la v&iacute;a de abordaje ni de la fijaci&oacute;n de la malla, sino particularmente, del tipo de pr&oacute;tesis, especialmente cuando se emplean mallas de baja densidad, las cuales han demostrado, en relaci&oacute;n con las mallas convencionales y las de polipropileno, una menor incidencia de dolor y de sensaci&oacute;n de cuerpo extra&ntilde;o, tanto en cirug&iacute;a laparosc&oacute;pica como abierta (herniorrafia de Lichtenstein) <sup>33-45</sup>. </p>       <p>En cuanto a otros resultados, la informaci&oacute;n evaluada indica que no existen diferencias significativas en cuanto a la tasa de infecci&oacute;n del sitio operatorio, hematoma ni seroma, cuando se fija una malla, exceptuando los resultados de la herniorrafia abierta, en la cual la tasa de infecci&oacute;n es superior cuando se utilizan mallas de autofijaci&oacute;n (sin fijaci&oacute;n: 4,1 % versus fijaci&oacute;n: 0). Este hallazgo no ha sido documentado en forma universal, pues existe informaci&oacute;n contradictoria no experimental que indica que la frecuencia de infecci&oacute;n del sitio operatorio es menor de 1 % con el uso de mallas de autofijaci&oacute;n  <sup>46</sup>. Si bien la informaci&oacute;n reportada indica que el costo es mayor cuando se fija la malla y que el tiempo operatorio empleado es mayor, en este estudio no se encontraron diferencias en el tiempo de retorno laboral y de incapacidad. </p>       ]]></body>
<body><![CDATA[<p>En cuanto al rendimiento de esta intervenci&oacute;n en poblaciones especiales, no se encontr&oacute; informaci&oacute;n discriminada en pacientes con hernia recurrente. En hernia bilateral, Taylor, et al., <sup>13</sup> encontraron que, al comparar la fijaci&oacute;n unilateral con la no fijaci&oacute;n contralateral en el mismo paciente, la probabilidad de sentirse m&aacute;s confortable es cinco veces mayor con la &uacute;ltima intervenci&oacute;n (47 % <i>versus</i> 9 %; p=0,006) <sup>13</sup>. Sin embargo, no se encontr&oacute; informaci&oacute;n discriminada sobre los resultados primarios y secundarios en hernia bilateral diferente a la anotada. En cuanto al n&uacute;mero de grapas (<i>tackers</i>) empleados, la literatura cient&iacute;fica informa que cuando se utilizan m&aacute;s de seis, se incrementa significativamente la presencia de dolor posoperatorio (p=0,008) <sup>13</sup>. Tampoco se encontr&oacute; informaci&oacute;n en cuanto a otros resultados, como reproducci&oacute;n, hematoma, seroma o infecci&oacute;n del sitio operatorio, en relaci&oacute;n con el n&uacute;mero de grapas (<i>tackers</i>) empleados. Finalmente, no se encontr&oacute; informaci&oacute;n sobre la fijaci&oacute;n de la malla en cirug&iacute;a abierta utilizando otro tipo de t&eacute;cnicas (preperitoneal y Shouldice, entre otras). </p>       <p>En conclusi&oacute;n, la literatura cient&iacute;fica disponible actualmente indica que, en general, en cirug&iacute;a abierta (Lichtenstein) y laparosc&oacute;pica (totalmente extraperitoneal, transabdominal preperitoneal) puede no fijarse la malla, pues esta intervenci&oacute;n no incide en la tasa de reproducci&oacute;n de la hernia. Tampoco existe diferencia significativa en la tasa de infecci&oacute;n del sitio operatorio, seroma ni hematoma, evaluada en los tres procedimientos. Igualmente, si bien en la mayor&iacute;a de los estudios (tanto con t&eacute;cnica abierta como laparosc&oacute;pica) se emplearon mallas de alta densidad, en todos los abordajes existe una diferencia constante en la disminuci&oacute;n de la tasa de dolor posoperatorio, particularmente el tard&iacute;o (a partir del sexto mes), a favor de no fijarla. No hay diferencia en cuanto a la reducci&oacute;n del tiempo de incapacidad y de retorno laboral en cirug&iacute;a laparosc&oacute;pica. En la cirug&iacute;a abierta, este resultado no ha sido evaluado. El tiempo operatorio es, en general, menor cuando no se fija la malla, pero, el incremento del costo directo es mayor al fijarla. Sin embargo, no existen evaluaciones de costo-efectividad sobre la intervenci&oacute;n. No se encontr&oacute; informaci&oacute;n sobre esta intervenci&oacute;n en otros tipos de herniorrafia abierta, como la preperitoneal (t&eacute;cnica de Nyhus), frecuentemente utilizado por muchos cirujanos en Colombia, por lo que no recomendamos modificaciones a la t&eacute;cnica hasta tanto no exista informaci&oacute;n disponible a favor o en contra de la fijaci&oacute;n.</p> <font size="3" face="Verdana"> <b>Conflictos de inter&eacute;s</b></font>       <p>No se reporta ninguno.</p>   <font size="3" face="Verdana"> <b>Referencias</b></font>       <!-- ref --><p>1.		Hollinsky C, Sandberg S, Koch T, Seidler S. Biomechanical properties of lightweight versus heavyweight meshes for laparoscopic inguinal hernia repair and their impact on recurrence rates. 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Kapischke M, Schulze H, Caliebe A. Self-fixating mesh for the Lichtenstein procedure--a prestudy. Langenbecks Arch Surg. 2010;395:317-22. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000062&pid=S2011-7582201200030000500017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>18.		Bruna-Esteban M, Cantos-Pallar&eacute;s M, Artigues-S&aacute;nchez De Rojas E. Use of adhesive mesh in hernioplasty compared to the conventional technique. Results of a randomised prospective study. 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