<?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>1688-0390</journal-id>
<journal-title><![CDATA[Revista Médica del Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Méd. Urug.]]></abbrev-journal-title>
<issn>1688-0390</issn>
<publisher>
<publisher-name><![CDATA[Sindicato Médico del Uruguay]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-03902002000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aspectos microbiológicos de interés en el diagnóstico de la peritonitis bacteriana espontánea del paciente con cirrosis hepática]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubinstein Aguñín]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bagattini]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Pasteur Facultad de Medicina Departamento de Medicina Interna]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2002</year>
</pub-date>
<volume>18</volume>
<numero>3</numero>
<fpage>225</fpage>
<lpage>229</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-03902002000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-03902002000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-03902002000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La peritonitis bacteriana espontánea es una complicación grave del paciente cirrótico, con elevada mortalidad intrahospitalaria y pobre pronóstico a corto plazo. Su diagnóstico requiere un elevado índice de sospecha, la realización precoz de paracentesis abdominal para recuento del número de polimorfonucleares en líquido de ascitis y estudio bacteriológico. El cultivo en frascos de hemocultivo ha sustituido al método tradicional en placa de agar por su mayor rendimiento diagnóstico y su menor demora. La importancia de los estudios bacteriológicos tiene un renovado interés debido a los cambios reportados en la literatura en la causa de la infección en relación al uso de antibioticoterapia profiláctica, al aumento de infecciones nosocomiales, y al bajo rendimiento del estudio directo del líquido de ascitis. Esta metodología de estudio del líquido de ascitis ha permitido mejorar el diagnóstico de peritonitis bacteriana espontánea en el Hospital Pasteur. En medios sanitarios de escasos recursos económicos, podría ser apropiado cultivar el líquido de ascitis de pacientes cirróticos en frascos de hemocultivo sólo en casos de sospecha clínica o analítica de peritonitis bacteriana espontánea, o de inicio de terapéutica antibiótica, disminuyendo así el costo asistencial en relación a esta técnica de cultivo microbiológica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Spontaneous bacterial peritonitis (SBP) is a serious complication in cirrhotic patients, provoking high rates of in-hospital mortality and bad short-term prognosis. Diagnosis needs high level suspect, early abdominal paracentesis to count neutrophils in ascitic fluid and bacterial analysis. Blood culture flasks have replaced traditional agar plate technique since diagnostic determination is more reliable and faster. The importance of bacterial studies has have a renewable interest since literature included data from antibiotic therapy, increase in hospitalization-related infections and low performance of direct analysis of ascitic fluid. This technique has improved diagnosis of spontaneous bacterial peritonitis in the Hospital Pasteur. Health centers with low financial resources should implement this technique in cases of clinical or analytical suspicion of SBP or antibiotic therapy to diminish costs.]]></p></abstract>
<abstract abstract-type="short" xml:lang="fr"><p><![CDATA[Résumé La péritonite bactérienne spontanée est une complication grave du patient cirrhotique qui a une mortalité intrahospitalière élevée et un pauvre pronostic à court terme. Son diagnostic exige un taux élevé de soupçon, la réalisation précoce de paracentèse abdominale pour comptabiliser le nombre de polymorphonucléaires en liquide d'ascite et étude bactériologique. La culture en flacons d'hémoculture a remplacé la méthode traditionnelle en plaque d'agar, vu son grand rendment diagnostique et son court délai. L'importance des études bactériologiques ont un plus grand intérêt vues les nouveautés publiées dans la littérature sur l'etiologie de l'infection en ce qui concerne l'emploi d'antibioticothérapie prophylactique, l'augmentation des infections hospitalières et le bas rendement de l'etude directe du liquide d'ascite. Cette méthodologie d'étude du liquide d'ascite a permis d'améliorer le diagnostic de péritonite bactérienne spontanée à l'Hôpital Pasteur. Dans un moyen sanitaire à pauvres ressources économiques, il pourrait être convenable de cultiver le liquide d'ascite des patients cirrhotiques dans des flacons d'hémoculture seulement en cas de soupçon clinique ou analytique de péritonite bactérienne spontanée, ou en cas de signe de thérapie antibiotique, ce qui diminuerait le coût d'assistance en ce qui concerne cette technique de culture microbiologique.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[CIRROSIS HEPATICA]]></kwd>
<kwd lng="es"><![CDATA[ASCITIS]]></kwd>
<kwd lng="es"><![CDATA[INFECCIONES BACTERIANAS]]></kwd>
<kwd lng="es"><![CDATA[PERITONITIS]]></kwd>
<kwd lng="es"><![CDATA[PERITONITIS]]></kwd>
<kwd lng="es"><![CDATA[PROFILAXIS ANTIBIÓTICA]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><font face="Verdana" size="4"><b>Aspectos microbiol&oacute;gicos de inter&eacute;s en el diagn&oacute;stico de la peritonitis bacteriana espont&aacute;nea del paciente con cirrosis hep&aacute;tica </b></font></p>      <p><font face="Verdana" size="2"><i><a name="1.-"></a>Dres. Pablo Rubinstein Agu&ntilde;&iacute;n<a href="#1.">1</a>, <a name="2.-"></a>Juan Carlos Bagattini<a href="#2.">2</a></i></font></p>      <p><font face="Verdana" size="2"><b>Resumen</b></font></p>      <p><font face="Verdana" size="2"><i>La peritonitis bacteriana espont&aacute;nea es una complicaci&oacute;n grave del paciente cirr&oacute;tico, con elevada mortalidad intrahospitalaria y pobre pron&oacute;stico a corto plazo. Su diagn&oacute;stico requiere un elevado &iacute;ndice de sospecha, la realizaci&oacute;n precoz de paracentesis abdominal para recuento del n&uacute;mero de polimorfonucleares en l&iacute;quido de ascitis y estudio bacteriol&oacute;gico. El cultivo en frascos de hemocultivo ha sustituido al m&eacute;todo tradicional en placa de agar por su mayor rendimiento diagn&oacute;stico y su menor demora. La importancia de los estudios bacteriol&oacute;gicos tiene un renovado inter&eacute;s debido a los cambios reportados en la literatura en la causa de la infecci&oacute;n en relaci&oacute;n al uso de antibioticoterapia profil&aacute;ctica, al aumento de infecciones nosocomiales, y al bajo rendimiento del estudio directo del l&iacute;quido de ascitis. Esta metodolog&iacute;a de estudio del l&iacute;quido de ascitis ha permitido mejorar el diagn&oacute;stico de peritonitis bacteriana espont&aacute;nea en el Hospital Pasteur. En medios sanitarios de escasos recursos econ&oacute;micos, podr&iacute;a ser apropiado cultivar el l&iacute;quido de ascitis de pacientes cirr&oacute;ticos en frascos de hemocultivo s&oacute;lo en casos de sospecha cl&iacute;nica o anal&iacute;tica de peritonitis bacteriana espont&aacute;nea, o de inicio de terap&eacute;utica antibi&oacute;tica, disminuyendo as&iacute; el costo asistencial en relaci&oacute;n a esta t&eacute;cnica de cultivo microbiol&oacute;gica.</i></font></p>      <p><font face="Verdana" size="2"><b>Palabras clave: </b><i> CIRROSIS HEPATICA - complicaciones.</i></font></p>      <p><font face="Verdana" size="2"><i> ASCITIS.</i></font></p>      <p><font face="Verdana" size="2"><i> INFECCIONES BACTERIANAS.</i></font></p>      <p><font face="Verdana" size="2"><i> PERITONITIS - diagn&oacute;stico.</i></font></p>      <p><font face="Verdana" size="2"><i> PERITONITIS - etiolog&iacute;a.</i></font></p>      <p><font face="Verdana" size="2"><i> PROFILAXIS ANTIBI&Oacute;TICA.</i></font></p>      ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><a name="1."></a><a href="#1.-">1</a>. M&eacute;dico Internista. Postgrado de Gastroenterolog&iacute;a.</font></p>      <p><font face="Verdana" size="2"><a name="2."></a><a href="#2.-">2</a>. M&eacute;dico Internista. M&eacute;dico Intensivista. Profesor Director de Cl&iacute;nica M&eacute;dica "2", Hospital Pasteur. Montevideo. Uruguay.</font></p>      <p><font face="Verdana" size="2">Centro: Departamento de Medicina Interna. Facultad de Medicina. Hospital Pasteur, Montevideo.</font></p>      <p><font face="Verdana" size="2"><b>Correspondencia: </b>Dr. Pablo Rubinstein.</font></p>      <p><font face="Verdana" size="2">Departamento de Medicina Interna. Hospital Pasteur. </font> </p>      <p><font face="Verdana" size="2">Larravide 2452. CP 11400. Montevideo-Uruguay.</font></p>      <p><font face="Verdana" size="2">E-mail: <a href="mailto:agunin69@montevideo.com.uy">agunin69@montevideo.com.uy</a></font></p>      <p><font face="Verdana" size="2">Presentado: 1/4/02.</font></p>      <p><font face="Verdana" size="2">Aceptado: 6/9/02.</font></p>  <b>     <p><font face="Verdana" size="2">Introducci&oacute;n</font></p>  </b>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La cirrosis hep&aacute;tica es una causa frecuente de inmunodepresi&oacute;n adquirida, y, en este contexto, las infecciones son frecuentes y graves(<a name="1.--"></a><a href="#1">1</a>).</font></p>      <p><font face="Verdana" size="2">La infecci&oacute;n espont&aacute;nea del l&iacute;quido de ascitis, o peritonitis bacteriana espont&aacute;nea (PBE), es una complicaci&oacute;n caracter&iacute;stica del paciente con cirrosis hep&aacute;tica y ascitis, si bien ha sido descrita en otras enfermedades, como insuficiencia card&iacute;aca congestiva, s&iacute;ndrome nefr&oacute;tico e insuficiencia hep&aacute;tica aguda grave(<a name="2.--"></a><a href="#2">2</a>,<a name="3.--"></a><a href="#3">3</a>)<i>.</i> Se trata de la infecci&oacute;n m&aacute;s frecuente del paciente cirr&oacute;tico(<a name="4.--"></a><a href="#4">4</a>).</font></p>      <p><font face="Verdana" size="2">La PBE es una peritonitis primaria, esto es, una infecci&oacute;n de l&iacute;quido de ascitis previamente est&eacute;ril en ausencia de un foco infeccioso intraabdominal evidente(<a name="5.--"></a><a href="#5">5</a>).</font></p>      <p><font face="Verdana" size="2">Su importancia est&aacute; dada por su elevada prevalencia y por su gravedad. De cada diez pacientes cirr&oacute;ticos que son hospitalizados, entre uno y tres presentar&aacute;n una PBE al momento del ingreso(<a name="6-8.--"></a><a href="#6">6</a>-<a href="#8">8</a>), lo cual se asocia con una elevada mortalidad intrahospitalaria, de 20% a 47%(<a name="9.--"></a><a href="#9">9</a>,<a name="10.--"></a><a href="#10">10</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">Desde la primera descripci&oacute;n de la enfermedad, en 1964(<a name="11.--"></a><a href="#11">11</a>), mucho se ha investigado en cuanto a su epidemiolog&iacute;a, patogenia, tratamiento y pron&oacute;stico. As&iacute;, cuando antes se sospechaba una PBE &uacute;nicamente ante cuadros peritoneales, con dolor, fiebre, v&oacute;mitos, &iacute;leo o diarrea, hoy d&iacute;a se sabe que su cl&iacute;nica es proteiforme, pudiendo manifestarse a trav&eacute;s de la aparici&oacute;n o agravamiento de encefalopat&iacute;a hep&aacute;tica, deterioro de la funci&oacute;n renal, o incluso, en 3% a 12% de los casos, puede estar presente en pacientes asintom&aacute;ticos(<a href="#9">9</a>,<a href="#10">10</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">De igual modo, los criterios diagn&oacute;sticos han ido evolucionando y distintos par&aacute;metros del l&iacute;quido de ascitis evaluados en alg&uacute;n momento (como ser el estudio en l&iacute;quido de ascitis de pH, lactato, distinci&oacute;n entre exudado y trasudado)(<a name="12-15.--"></a><a href="#12">12</a>-<a href="#15">15</a>), ya no se consideran &uacute;tiles para su diagn&oacute;stico.</font></p>      <p><font face="Verdana" size="2">Hoy d&iacute;a, el diagn&oacute;stico de PBE se basa en el recuento de polimorfonucleares (PMN) en l&iacute;quido de ascitis y en el aislamiento de microorganismos en su cultivo(<a href="#5">5</a>,<a name="16.--"></a><a href="#16">16</a>,<a name="17.--"></a><a href="#17">17</a>).</font></p>      <p><font face="Verdana" size="2">En funci&oacute;n del recuento de PMN en l&iacute;quido de ascitis, y de la presencia o ausencia de g&eacute;rmenes en los cultivos, se reconocen tres variantes de PBE:</font></p>      <p><font face="Verdana" size="2">- PBE cultivo positivo, que es aquella que presenta un recuento de PMN superior a 250 por microlitro (o por mm3), y asocia un cultivo positivo, generalmente monomicrobiano;</font></p>      <p><font face="Verdana" size="2">- PBE cultivo negativo, o ascitis neutroc&iacute;tica cultivo negativo, que asocia un recuento de PMN superior a 250 por microlitro, pero los cultivos no muestran bacterias;</font></p>      ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">- Bacteroascitis, tiene un recuento de PMN inferior a 250 por microlitro, y cultivo positivo.</font></p>      <p><font face="Verdana" size="2">La PBE cultivo positivo (entre 39% y 80% de las PBE seg&uacute;n las series(<a href="#4">4</a>,<a name="18-21.--"></a><a href="#18">18</a>-<a href="#21">21</a>)) y la PBE cultivo negativo no tienen diferencias entre s&iacute; en cuanto a la causa de hepatopat&iacute;a, las manifestaciones cl&iacute;nicas, la bacteriolog&iacute;a, el tratamiento y el pron&oacute;stico(<a name="22.--"></a><a href="#22">22</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">Sin embargo, el diagn&oacute;stico de PBE cultivo negativo exige excluir otras causas de ascitis neutroc&iacute;tica como carcinomatosis peritoneal o pancreatitis(<a name="23.--"></a><a href="#23">23</a>).</font></p>      <p><font face="Verdana" size="2">La bacteroascitis, a diferencia de las anteriores, se refiere a la colonizaci&oacute;n bacteriana del l&iacute;quido de ascitis sin que se desencadene una respuesta inflamatoria, lo cual podr&iacute;a corresponder a la etapa inicial de una PBE en la que a&uacute;n no se ha producido el aumento de PMN o, por el contrario, puede ser una colonizaci&oacute;n pasajera en la que las bacterias alcanzan el l&iacute;quido asc&iacute;tico pero la capacidad defensiva de &eacute;ste es suficiente para combatir la infecci&oacute;n(<a name="24.--"></a><a href="#24">24</a>). As&iacute; pues, distintas posturas se han tomado en la bacteroascitis, desde realizar antibioticoterapia emp&iacute;rica igual que en los otros casos de PBE, repetir los cultivos y en caso de que persistan positivos realizar antibioticoterapia, as&iacute; como realizar el seguimiento mediante paracentesis seriadas evaluando la evoluci&oacute;n del recuento de PMN(<a href="#24">24</a>,<a name="25.--"></a><a href="#25">25</a>). La actitud actual es -en el paciente asintom&aacute;tico- repetir la paracentesis con recuento de PMN y cultivos: si los PMN han aumentado por encima de 250/mm3 o los cultivos persisten positivos, o ambos, comenzar antibioticoterapia(<a href="#5">5</a>). Sin embargo, si el paciente desarrolla s&iacute;ntomas o deteriora su funci&oacute;n hep&aacute;tica o renal, o se torna encefalop&aacute;tico, debe recibir antibi&oacute;ticos(<a href="#5">5</a>,<a href="#9">9</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">Por lo tanto, el estudio del l&iacute;quido de ascitis con recuento de PMN tiene un rol capital en el diagn&oacute;stico de PBE, habi&eacute;ndose establecido el punto de corte en 250 PMN/microlitro(<a href="#5">5</a>,<a href="#16">16</a>,<a href="#17">17</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">Sin embargo, el estudio bacteriol&oacute;gico no tiene una importancia menor.</font></p>      <p><font face="Verdana" size="2">En primer lugar, el hallazgo de flora polimicrobiana en el l&iacute;quido de ascitis, as&iacute; como el desarrollo de bacterias anaerobias o de hongos, obliga a descartar una peritonitis secundaria, especialmente por perforaci&oacute;n intestinal, lo cual, en ocasiones, puede ser dif&iacute;cil de distinguir en estos pacientes(<a href="#5">5</a>,<a name="26.--"></a><a href="#26">26</a>,<a name="27.--"></a><a href="#27">27</a>)<i>. </i>Mientras que la PBE es de tratamiento m&eacute;dico y una intervenci&oacute;n quir&uacute;rgica en ese contexto conlleva un riesgo muy alto de morbimortalidad perioperatoria, la peritonitis secundaria requiere tratamiento quir&uacute;rgico. En este sentido, se han identificado otros criterios sugestivos de PBE secundaria en el l&iacute;quido de ascitis: glucosa inferior a 0,5 g/l, LDH superior al valor normal en plasma, y prote&iacute;nas superior a 10 g/l(<a href="#26">26</a>).</font></p>      <p><font face="Verdana" size="2">Por otro lado, dado que en la PBE la concentraci&oacute;n de bacterias en l&iacute;quido de ascitis es muy baja (aproximadamente 1 por ml, a diferencia de las peritonitis perforativas que superan las 10.000 por ml)(<a href="#19">19</a>) el estudio bacteriol&oacute;gico directo es de escaso rendimiento diagn&oacute;stico en PBE, siendo &uacute;til, sin embargo, para diferenciar las peritonitis secundarias(<a name="28.--"></a><a href="#28">28</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">As&iacute; mismo, el aislamiento del agente pat&oacute;geno y el estudio de su sensibilidad antibi&oacute;tica es especialmente importante teniendo en cuenta el cambio en la bacteriolog&iacute;a responsable de PBE ocurrida como consecuencia del uso de antibioticoterapia profil&aacute;ctica para descontaminaci&oacute;n intestinal selectiva (DIS). Los g&eacute;rmenes que con mayor frecuencia se a&iacute;slan en pacientes con PBE de origen comunitario son bacilos gramnegativos aerobios (70%) procedentes de la flora ent&eacute;rica, en particular <i>E. coli</i>(<a href="#5">5</a>). Por ello se pens&oacute; que la administraci&oacute;n de antibi&oacute;ticos que cubran la flora ent&eacute;rica gramnegativa, preservando los cocos grampositivos y las bacterias anaerobias, pod&iacute;a ser un m&eacute;todo eficaz habida cuenta del papel del sobrecrecimiento bacteriano y la traslocaci&oacute;n bacteriana en la patogenia de la enfermedad(<a name="29-31.--"></a><a href="#29">29</a>-<a href="#31">31</a>)<i>.</i> Esta conducta, si bien disminuye la recurrencia de PBE por bacilos gramnegativos de origen ent&eacute;rico, y disminuye la incidencia de PBE(<a name="32-33.--"></a><a href="#32">32</a>,<a href="#33">33</a>), determin&oacute; un incremento de la incidencia de PBE por cocos grampositivos (en particular <i>Staphylococcus aureus</i>)(<a href="#4">4</a>,<a name="34.--"></a><a href="#34">34</a>) y de PBE y otras infecciones debidas a bacilos gramnegativos resistentes a las quinolonas (los f&aacute;rmacos utilizados habitualmente para DIS)(<a href="#4">4</a>,<a name="35-37.--"></a><a href="#35">35</a>-<a href="#37">37</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">Por otro lado, en los &uacute;ltimos a&ntilde;os se ha generalizado el manejo de estos pacientes en unidades de cuidados intensivos (debido a descompensaciones de la hepatopat&iacute;a y en relaci&oacute;n a trasplante hep&aacute;tico), as&iacute; como la utilizaci&oacute;n de procedimientos invasivos en los pacientes cirr&oacute;ticos (esclerosis y ligaduras endosc&oacute;picas, derivaciones portosist&eacute;micas, tratamiento no quir&uacute;rgico de hepatocarcinoma, cateterismos de venas suprahep&aacute;ticas), lo cual incrementa el riesgo de infecciones nosocomiales, en particular debidas a cocos grampositivos y a bacilos gram-negativos no ent&eacute;ricos(<a href="#4">4</a>).</font></p>      ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Cl&aacute;sicamente, el cultivo del l&iacute;quido de ascitis se realizaba sembrando unas gotas en placa de agar. Este m&eacute;todo, si bien es &uacute;til para las peritonitis secundarias, tiene bajo rendimiento en la PBE debido al escaso n&uacute;mero de bacterias en el fluido, resultando negativo en 50% a 60%(<a name="38.--"></a><a href="#38">38</a>). Inoculando el l&iacute;quido de ascitis en frascos de hemocultivos, Runyon y colaboradores lograron identificar el agente causal en 82% de las PBE(<a href="#38">38</a>). Sin embargo, la demora en la inoculaci&oacute;n del l&iacute;quido disminuye el rendimiento diagn&oacute;stico de esta t&eacute;cnica, por lo que el cultivo debe realizarse apenas obtenida la muestra(<a name="39.--"></a><a href="#39">39</a>).</font></p>      <p><font face="Verdana" size="2">El sistema de cultivo colorim&eacute;trico automatizado (BacT/Alert) ha mostrado tener igual sensibilidad diagn&oacute;stica que el cultivo en los frascos tradicionales de hemocultivo, pero disminuyendo el tiempo de espera de 43 horas a 13 horas(<a name="40.--"></a><a href="#40">40</a>)<i>.</i></font></p>      <p><font face="Verdana" size="2">La pauta recomendada de cultivar sistem&aacute;ticamente en frascos de hemocultivo el l&iacute;quido de ascitis, puede ser la &uacute;nica forma de diagnosticar bacteroascitis(<a href="#5">5</a>)<i>.</i> Sin embargo, esta pr&aacute;ctica aumenta el costo del estudio del l&iacute;quido de ascitis en aproximadamente U$S 20 (d&oacute;lares americanos) por paracentesis. En un reciente estudio realizado en nuestro medio(<a href="#10">10</a>), en el que se estudi&oacute; prospectivamente 64 pacientes hospitalizados portadores de cirrosis hep&aacute;tica y ascitis mediante paracentesis abdominal, realizando cultivo en frascos de hemocultivo en forma sistem&aacute;tica, no se encontr&oacute; ning&uacute;n episodio de bacteroascitis (paciente asintom&aacute;tico con recuento inferior a 250 polimorfonucleares por mm3 y cultivo positivo), por lo que esta entidad no parece tener en nuestro medio la prevalencia ni la relevancia reportada en la literatura en series de hace una d&eacute;cada(<a href="#24">24</a>,<a href="#29">29</a>). Esto sugiere que en medios sanitarios con escasos recursos econ&oacute;micos, podr&iacute;a ser apropiado realizar cultivo del l&iacute;quido de ascitis en frasco de hemocultivo s&oacute;lo en aquellos pacientes con cirrosis hep&aacute;tica en que exista sintomatolog&iacute;a sugestiva de PBE o con m&aacute;s de 250 PMN/mm3, o ambos, en su l&iacute;quido de ascitis. </font> </p>      <p><font face="Verdana" size="2">Aquellos pacientes que carecen de sintomatolog&iacute;a infecciosa, de signolog&iacute;a abdominal, as&iacute; como de descompensaci&oacute;n de su hepatopat&iacute;a en forma de encefalopat&iacute;a o insuficiencia renal, representan una poblaci&oacute;n peque&ntilde;a del total de pacientes cirr&oacute;ticos en los que se realiza una paracentesis abdominal y que finalmente tienen una peritonitis bacteriana espont&aacute;nea. En nuestra serie(<a href="#10">10</a>), de 64 pacientes cirr&oacute;ticos hospitalizados, s&oacute;lo tres ten&iacute;an PBE en ausencia de s&iacute;ntomas y signos sugestivos (1,92%); los tres pacientes tuvieron un recuento de polimorfonucleares superior a 250 por microlitro, y ninguno de los tres tuvo cultivos positivos (cultivando en frascos de hemocultivo). Por otro lado, aquellos enfermos que presentan una hemorragia digestiva tambi&eacute;n requieren paracentesis diagn&oacute;stica previo al inicio de antibioticoterapia profil&aacute;ctica(<a href="#5">5</a>,<a href="#31">31</a>,<a name="41-42.--"></a><a href="#41">41</a>,<a href="#42">42</a>). Por lo tanto, si se excluye a los pacientes cirr&oacute;ticos con ascitis que presentan alg&uacute;n elemento sugestivo de PBE (fiebre, leucocitosis, &iacute;leo, diarrea, dolor abdominal, deterioro renal, encefalopat&iacute;a hep&aacute;tica), a aquellos pacientes que ser&aacute;n sometidos a antibioticoterapia profil&aacute;ctica o terap&eacute;utica, as&iacute; como a quienes tienen un recuento de polimorfonucleares superior a 250 por microlitro, el contingente de pacientes con ascitis que pudieran tener una bacteroascitis seguramente ser&aacute; peque&ntilde;o. Si bien en el estudio del Hospital Pasteur(<a href="#10">10</a>) no se encontr&oacute; ning&uacute;n paciente con bacteroascitis, es claro que el hecho de no cultivar sistem&aacute;ticamente en frasco de hemocultivo el l&iacute;quido de ascitis no permitir&iacute;a el diagn&oacute;stico de esta forma de PBE. Esta actitud no se justificar&iacute;a, entonces, en medios donde el costo que supone esta t&eacute;cnica de cultivo no implica un esfuerzo econ&oacute;mico mayor.</font></p>      <p><font face="Verdana" size="2">Por lo tanto, se recomienda el cultivo de ascitis en frascos de hemocultivos en pacientes en los que se realizar&aacute; profilaxis primaria o secundaria de PBE(<a href="#5">5</a>), terap&eacute;utica antimicrobiana por otras causas, as&iacute; como en quienes presenten otras enfermedades hep&aacute;ticas (falla hep&aacute;tica fulminante y subfulminante, hepatitis alcoh&oacute;lica aguda grave).</font></p>      <p> <font face="Verdana" size="2">En este estudio se compar&oacute;, adem&aacute;s, el rendimiento diagn&oacute;stico del m&eacute;todo empleado para el cultivo del l&iacute;quido de ascitis en el Hospital Pasteur(<a href="#10">10</a>), encontr&aacute;ndose, en un per&iacute;odo retrospectivo de 12 meses, un &uacute;nico episodio de infecci&oacute;n del l&iacute;quido de ascitis mediante cultivo en placa de agar en 14 l&iacute;quidos estudiados (7,14%), mientras que en forma prospectiva, en un per&iacute;odo de 20 meses se diagnosticaron 17 episodios de PBE mediante recuento de PMN y cultivo en frascos de hemocultivo (17 de 64 = 26,56%), de los cuales, ocho fueron PBE cultivo positivo (8 de 17 = 47%).</font></p>      <p><font face="Verdana" size="2">El cambio, en la t&eacute;cnica de cultivo en placa de agar el frasco de hemocultivo significa un avance sustancial en el diagn&oacute;stico etiol&oacute;gico de la PBE, permitiendo no s&oacute;lo recuperar el germen en un mayor n&uacute;mero de casos, sino tambi&eacute;n un menor tiempo de espera, lo cual es importante a la hora de modificar precozmente una pauta antibi&oacute;tica emp&iacute;rica. Un elevado &iacute;ndice de sospecha de la enfermedad, realizando precozmente una paracentesis abdominal para estudiar el l&iacute;quido de ascitis mediante recuento de PMN y cultivo de 10 ml de l&iacute;quido en dos frascos de hemocultivo en medio para aerobios y anaerobios, junto con el pronto inicio de antibioticoterapia emp&iacute;rica(<a href="#5">5</a>), ha permitido descender la mortalidad intrahospitalaria de 80%-90% en la d&eacute;cada de 1970 a 20%-50%(<a href="#9">9</a>).</font></p>      <p><font face="Verdana" size="2">Finalmente, dado el pobre pron&oacute;stico a un a&ntilde;o, estos pacientes deben ser evaluados para trasplante hep&aacute;tico(<a href="#5">5</a>).</font></p>  <b>     <p><font face="Verdana" size="2">Summary</font></p>  </b>     <p><font face="Verdana" size="2">Spontaneous bacterial peritonitis (SBP) is a serious complication in cirrhotic patients, provoking high rates of in-hospital mortality and bad short-term prognosis. Diagnosis needs high level suspect, early abdominal paracentesis to count neutrophils in ascitic fluid and bacterial analysis. Blood culture flasks have replaced traditional agar plate technique since diagnostic determination is more reliable and faster. The importance of bacterial studies has have a renewable interest since literature included data from antibiotic therapy, increase in hospitalization-related infections and low performance of direct analysis of ascitic fluid. This technique has improved diagnosis of spontaneous bacterial peritonitis in the Hospital Pasteur. Health centers with low financial resources should implement this technique in cases of clinical or analytical suspicion of SBP or antibiotic therapy to diminish costs.</font></p>  <b>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">R&eacute;sum&eacute;</font></p>  </b>     <p><font face="Verdana" size="2">La p&eacute;ritonite bact&eacute;rienne spontan&eacute;e est une complication grave du patient cirrhotique qui a une mortalit&eacute; intrahospitali&egrave;re &eacute;lev&eacute;e et un pauvre pronostic &agrave; court terme. Son diagnostic exige un taux &eacute;lev&eacute; de soup&ccedil;on, la r&eacute;alisation pr&eacute;coce de paracent&egrave;se abdominale pour comptabiliser le nombre de polymorphonucl&eacute;aires en liquide d'ascite et &eacute;tude bact&eacute;riologique. La culture en flacons d'h&eacute;moculture a remplac&eacute; la m&eacute;thode traditionnelle en plaque d'agar, vu son grand rendment diagnostique et son court d&eacute;lai. L'importance des &eacute;tudes bact&eacute;riologiques ont un plus grand int&eacute;r&ecirc;t vues les nouveaut&eacute;s publi&eacute;es dans la litt&eacute;rature sur l'etiologie de l'infection en ce qui concerne l'emploi d'antibioticoth&eacute;rapie prophylactique, l'augmentation des infections hospitali&egrave;res et le bas rendement de l'etude directe du liquide d'ascite. Cette m&eacute;thodologie d'&eacute;tude du liquide d'ascite a permis d'am&eacute;liorer le diagnostic de p&eacute;ritonite bact&eacute;rienne spontan&eacute;e &agrave; l'H&ocirc;pital Pasteur. Dans un moyen sanitaire &agrave; pauvres ressources &eacute;conomiques, il pourrait &ecirc;tre convenable de cultiver le liquide d'ascite des patients cirrhotiques dans des flacons d'h&eacute;moculture seulement en cas de soup&ccedil;on clinique ou analytique de p&eacute;ritonite bact&eacute;rienne spontan&eacute;e, ou en cas de signe de th&eacute;rapie antibiotique, ce qui diminuerait le co&ucirc;t d'assistance en ce qui concerne cette technique de culture microbiologique.</font></p>  <b>     <p><font face="Verdana" size="2">Bibliograf&iacute;a</font></p>  </b>     <!-- ref --><p><font face="Verdana" size="2"><a name="1"></a><a href="#1.--">1</a>.<b> Rimola A, Bory F, Planas R, Xaubet A, Bruguera M, Rodes J.</b> Infecciones bacterianas agudas en la cirrosis hep&aacute;tica. Gastroenterol Hepatol 1981; 18: 353-8.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="2"></a><a href="#2.--">2</a>.<b> Runyon BA.</b> Spontaneous bacterial peritonitis associated with cardiac ascites. Am J Gastroenterol 1984; 79(10): 796.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="3"></a><a href="#3.--">3</a>.<b> Thomas FB, Fromkes JJ.</b> Spontaneous bacterial peritonitis associated with acute viral hepatitis. J Clin Gastroenterol 1982; 4(3): 259-62.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="4"></a><a href="#4.--">4</a>.<b> Fern&aacute;ndez J, Navasa M, G&oacute;mez J, Colmenero J, Vila J, Arroyo V, et al.</b> Bacterial infections in cirrhosis: epidemiological changes with invasive procedures and norfloxacin prophylaxis. Hepatology 2002; 35(1): 140-8.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="5"></a><a href="#5.--">5</a>.<b> Rimola A, Garc&iacute;a-Tsao G, Navasa M, Piddock LJ, Planas R, Bernard B, et al.</b> Diagnosis, treatment and prophylaxis of spontaneous bacterial peritonitis: a consensus document. J Hepatol 2000; 32(1): 142-53.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="6"></a><a href="#6-8.--">6</a>.<b> Hoefs JC, Canawati HN, Sapico FL, Hopkins RR, Weiner J, Montgomerie JZ.</b> Spontaneous bacterial peritonitis. Hepatology 1982; 2(4): 339-402.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="7"></a><a href="#6-8.--">7</a>.<b> Caly WR, Strauss E.</b> A prospective study of bacterial infections in patients with cirrhosis. J Hepatol 1993; 18(3): 353-8.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="8"></a><a href="#6-8.--">8</a>. <b>Hurwich DB, Lindor KD, Hay JE, Gross JB Jr, Kaese D, Rajela J.</b> Prevalence of peritonitis and the ascitic fluid protein concentration among chronic liver disease patients. Am J Gastroenterol 1993; 88(8): 1254-7.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="9"></a><a href="#9.--">9</a>.<b> Such J, Guarner C, Runyon BA.</b> Spontaneous bacterial peritonitis. In: Arroyo V, Gin&egrave;s P, Rod&eacute;s J, Schrier R (ed). Ascites and renal dysfunction in liver disease: pathogenesis, diagnosis, and treatment. Massachusetts: Blackwell Science, 1999: 99-115.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="10"></a><a href="#10.--">10</a>.<b> Rubinstein P, Morales M, Pandiani A, Bagattini JC.</b> Peritonitis bacteriana espont&aacute;nea en cirrosis hep&aacute;tica con ascitis: incidencia, bacteriolog&iacute;a y mortalidad en Uruguay. Acta Gastroenterol Latinoam 2001; 31(4): 307-12.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="11"></a><a href="#11.--">11</a>.<b> Conn HO, Fessel JM.</b> Spontaneous bacterial peritonitis and bacteriemia in cirrhotic patients caused by enteric bacteria. Ann Intern Med 1964; 60: 568-80.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="12"></a><a href="#12-15.--">12</a>.<b> Garc&iacute;a Tsao G, Conn HO, Lerner E.</b> The diagnosis of bacterial peritonitis. Comparison of pH, lactate concentration and leukocyte count. Hepatology 1985; 5(1): 91-6.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="13"></a><a href="#12-15.--">13</a>.<b> Yang CY, Liaw YF, Chu CM, Sheen IS. </b>White count, pH and lactate in the diagnosis of spontaneous bacterial peritonitis. Hepatology 1985; 5(1): 85-90.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="14"></a><a href="#12-15.--">14</a>.<b> Pinzello G, Virdone R, Lojacono F, Ciambra M, Dardanoni G, Fiorentino G, et al.</b> Is the acidity of ascitic fluid a reliable index in making presumptive diagnosis of spontaneous bacterial peritonitis? Hepatology 1986; 6(2): 244-7.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="15"></a><a href="#12-15.--">15</a>.<b> Gitlin N, Stauffer JL, Silvestri RC.</b> The pH of ascitic fluid in the diagnosis of spontaneous bacterial peritonitis. Hepatology 1982; 2(4): 408-11.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="16"></a><a href="#16.--">16</a>.<b> Runyon BA, Antillon MR.</b> Ascitic fluid pH and lactate: insensitive and non-specific tests in detecting ascitic fluid infection. Hepatology 1991; 13(5): 929-35.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="17"></a><a href="#17.--">17</a>.<b> Albillos A, Cuervas-Mons V, Mill&aacute;n I, Canton T, Montes J, Barrios C, et al.</b> Ascitic fluid polymorphonuclear cell count and serum to ascites albumin gradient in the diagnosis of bacterial peritonitis. Gastroenterology 1990; 98(1): 134-40.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="18"></a><a href="#18-21.--">18</a>.<b> Rimola A, Salmeron JM, Clemente G, Rodrigo L, Obrador A, Miranda ML, et al.</b> Two different dosages of cefotaxime in the treatment of spontaneous bacterial peritonitis in cirrhosis: results of a prospective, randomized, multicenter study. Hepatology 1995; 21(3): 674-9.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="19"></a><a href="#18-21.--">19</a>.<b> Runyon BA, Canawati HN, Akriviadis EA. </b>Optimization of ascitic fluid culture technique. Gastroenterology 1988; 95(5): 1351-5.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="20"></a><a href="#18-21.--">20</a>.<b> Runyon BA, Umland EJ, Merlin T.</b> Innoculation of blood culture bottles with ascitic fluid. Improved detection of spontaneous bacterial peritonitis. Arch Intern Med 1987; 147(1): 73-5.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="21"></a><a href="#18-21.--">21</a>.<b> Castellote J, Xiol V, Verdaguer R, Ribes J, Guardiola J, Gim&eacute;nez A, et al.</b> Comparison of two ascitic fluid culture methods in cirrhotic patients with spontaneous bacterial peritonitis. J Clin Microbiol 1990; 28: 2811-2.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="22"></a><a href="#22.--">22</a>.<b> Terg R, Levi D, L&oacute;pez P, Rafaelli C, Rojter S, Abecasis R, et al.</b> Analysis of clinical course and prognosis of culture-positive spontaneous bacterial peritonitis and neutrocytic ascites. Evidence of the same disease. Dig Dis Sci 1992; 37(10): 1499-504.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="23"></a><a href="#23.--">23</a>.<b> Runyon BA, Hoefs JC.</b> Culture negative neutrocytic ascites: a variant of spontaneous bacterial peritonitis. Hepatology 1984; 4(6): 1209-11.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="24"></a><a href="#24.--">24</a>.<b> Runyon BA.</b> Monomicrobial non-neutrocytic bacterascites: a variant of spontaneous bacterial peritonitis. Hepatology 1990; 12(4 Pt 1): 710-5.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="25"></a><a href="#25.--">25</a>. <b>Chu CM, Chang KY, Liaw YF.</b> Prevalence and prognostic significance of bacterascites in cirrhosis with ascites. Dig Dis Sci 1995; 40(3): 561-5.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="26"></a><a href="#26.--">26</a>.<b> Akriviadis EA, Runyon BA.</b> Utility of an algorithm in differentiating spontaneous from secondary bacterial peritonitis. Gastroenterology 1990; 98(1): 127-33.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="27"></a><a href="#27.--">27</a>.<b> Targan SR, Chaw AW, Guze LB.</b> Role of anaerobic bacteria in spontaneous peritonitis of cirrhosis. Report of two cases and review of the literature. Am J Med 1977; 62(3): 397-403.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="28"></a><a href="#28.--">28</a>.<b> Runyon BA, Hoefs JC.</b> Spontaneous versus secondary bacterial peritonitis. Differentiation by response of ascitic fluid neutrophil count to antimicrobial therapy. Arch Intern Med 1986; 146(8): 1563-5.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="29"></a><a href="#29-31.--">29</a>.<b> Garc&iacute;a-Tsao G, Lee FY, Barden GE, Cartun R, West AB.</b> Bacterial translocation to mesenteric lymph nodes is increased in cirrhotic rats with ascites. Gastroenterology 1995; 108(6): 1835-41</font><!-- ref --><p><font face="Verdana" size="2"><a name="30"></a><a href="#29-31.--">30</a>.<b> Cirera I, Bauer TM, Navasa M, Vila J, Grande L, Taura P, et al.</b> Bacterial translocation of enteric organisms in patients with cirrhosis. J Hepatol 2001; 34(1): 32-7.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="31"></a><a href="#29-31.--">31</a>.<b> Gines P, Rimola A, Planas R, Vargas V, Marco F, Almela M. </b>Norfloxacin prevents spontaneous bacterial peritonitis recurrence in cirrhosis: results of a double-blind, placebo-controlled trial. Hepatology 1990; 12(4 Pt 1): 716-24.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="32"></a><a href="#32-33.--">32</a>.<b> Grange JD, Roulot D, Pelletier G, Pariente EA, Denis J, Ink O, et al.</b> Norfloxacin primary prophylaxis of bacterial infections in cirrhotic patients with ascites: a double-blind, randomized trial. J Hepatol 1998; 29(3): 430-6.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="33"></a><a href="#32-33.--">33</a>.<b> Novella MT, Sol&aacute; R, Soriano G, Andreu M, Gana J, Ortiz J, et al.</b> Continuous versus in patients prophylaxis of the first episode of spontaneous bacterial peritonitis with norfloxacin. Hepatology 1997; 25: 532-6.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="34"></a><a href="#34.--">34</a>.<b> Llovet JM, Rodr&iacute;guez-Iglesias P, Moitinho E, Planas R, Bataller R, Navasa M, et al.</b> Spontaneous bacterial peritonitis in patients with cirrhosis undergoing selective intestinal decontamination. A retrospective study of 229 spontaneous bacterial peritonitis episodes. J Hepatol 1997; 26(1): 88-95.    </font></p>      ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2"><a name="35"></a><a href="#35-37.--">35</a>.<b> Castellote J, Xiol J, Rote R, Fern&aacute;ndez G.</b> Spontaneous bacterial peritonitis and empyema by Escherichia coli resistant to norfloxacin in a patient on selective intestinal decontamination with norfloxacin. J Hepatol 1994; 20(3): 436.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="36"></a><a href="#35-37.--">36</a>.<b> Aparicio JR, Such J, Pascual S, Arroyo A, Plazas J, Girona E, et al.</b> Development of quinolone-resistant strains of Escherichia coli in stools of patients with cirrhosis undergoing norfloxacin prophylaxis: clinical consequences. J Hepatol 1999; 31(2): 277-83.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="37"></a><a href="#35-37.--">37</a>.<b> Ortiz J, Vila MC, Soriano G, Mi&ntilde;ana J, Gana J, Mirelis B, et al.</b> Infections caused by Escherichia coli resistant to norfloxacin in hospitalized cirrhotic patients. Hepatology 1999; 29(4): 1064-9.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="38"></a><a href="#38.--">38</a>.<b> Runyon BA, Umland EJ, Merlin T.</b> Inoculation of blood culture bottles with ascitic fluid at the bedside markedly improves detection of spontaneous bacterial peritonitis. Arch Intern Med 1987; 147(1): 73-5.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="39"></a><a href="#39.--">39</a>.<b> Runyon BA, Antillon MR, Akriviadis EA, McHutchinson JG.</b> Bedside inoculation of blood culture bottles with ascitic fluid is superior to delayed inoculation in the detection of spontaneous bacterial peritonitis. J Clin Microbiol 1990; 28(12): 2811-2.    </font></p>      ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2"><a name="40"></a><a href="#40.--">40</a>.<b> Ortiz J, Soriano G, Coll P, Novella MT, Pericas R, Sabat M, et al.</b> Early microbiologic diagnosis of spontaneous bacterial peritonitis with BacT/ALERT. J Hepatol 1997; 26(4): 839-44.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="41"></a><a href="#41-42.--">41</a>. <b>Rimola A, Bory F, Ter&eacute;s J, P&eacute;rez-Ayuso RM, Arroyo V, Rod&eacute;s J. </b>Oral non-absorbable antibiotics prevent infection in cirrhosis with gastrointestinal hemorrhage. Hepatology 1985; 5: 463-7.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="42"></a><a href="#41-42.--">42</a>. <b>Soriano G, Guarner C, Tom&aacute;s, Villanueva C, Torras X, Gonz&aacute;lez D, et al.</b> Norfloxacin prevents bacterial infection in cirrhotics with gastrointestinal hemorrhage. Gastroenterology 1992; 103(4): 1267-72.    </font></p>      <p> </p>       ]]></body><back>
<ref-list>
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<person-group person-group-type="author">
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