<?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>0210-5691</journal-id>
<journal-title><![CDATA[Medicina Intensiva]]></journal-title>
<abbrev-journal-title><![CDATA[Med. Intensiva]]></abbrev-journal-title>
<issn>0210-5691</issn>
<publisher>
<publisher-name><![CDATA[Elsevier España, S.L.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0210-56912007000600005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Recomendaciones GEIPC-SEIMC y GTEI-SEMICYUC para el tratamiento antibiótico de infecciones por cocos grampositivos en el paciente crítico]]></article-title>
<article-title xml:lang="en"><![CDATA[GEIPC-SEIMC and GTEI-SEMICYUC recommendations for antibiotic treatment of gram positive coccal infections in the critical patient]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olaechea Astigarraga]]></surname>
<given-names><![CDATA[PM]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garnacho Montero]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Grau Cerrato]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Colomo]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palomar Martínez]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zaragoza Crespo]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz García-Paredes]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<xref ref-type="aff" rid="A07"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerdá Cerdá]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<xref ref-type="aff" rid="A08"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez Lerma]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<xref ref-type="aff" rid="A09"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital de Galdakao Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Galdakao ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Universitario Virgen del Rocío Servicio de Cuidados Críticos y Urgencias ]]></institution>
<addr-line><![CDATA[Sevilla ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital del Mar Servicio de Farmacia ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Hospital Clínico Universitario Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Valencia ]]></addr-line>
</aff>
<aff id="A05">
<institution><![CDATA[,Hospital Vall D'Hebron Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
</aff>
<aff id="A06">
<institution><![CDATA[,Hospital Universitario Dr. Peset Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Valencia ]]></addr-line>
</aff>
<aff id="A07">
<institution><![CDATA[,Hospital General Universitario Gregorio Marañón Servicio de Microbiología Clínica ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
</aff>
<aff id="A08">
<institution><![CDATA[,Hospital Universitario de Getafe Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
</aff>
<aff id="A09">
<institution><![CDATA[,Hospital del Mar Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<volume>31</volume>
<numero>6</numero>
<fpage>294</fpage>
<lpage>317</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0210-56912007000600005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0210-56912007000600005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0210-56912007000600005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En los últimos años se ha constatado un incremento en las infecciones causadas por cocos grampositivos tanto en infecciones comunitarias como nosocomiales. En algunos países, se ha observado un rápido desarrollo de resistencias a los antibióticos habitualmente empleados para su tratamiento, y se supone que esa situación puede llegar en el futuro a nuestro país. Se están desarrollando nuevos antimicrobianos específicamente dirigidos para el tratamiento de estas infecciones, pero es necesario profundizar en el conocimiento de las propiedades farmacocinéticas de los antibióticos tanto antiguos como nuevos, para aprovechar al máximo sus cualidades frente a estos patógenos y evitar en lo posible su toxicidad. En el paciente crítico estos problemas son más acuciantes, ya que la inadecuación del tratamiento, tanto en la elección del antibiótico como en la dosis y en la administración, se acompañan frecuentemente de fracasos terapéuticos y por tanto de mal pronóstico. Expertos de dos grupos de trabajo de dos Sociedades científicas, pertenecientes al Grupo de estudio de Infecciones en el Paciente Crítico de la SEIMC (GEIPC-SEIMC) y al Grupo de trabajo de Enfermedades Infecciosas de la SEMICYUC (GTEI- SEMICYUC) se han reunido con el objetivo de elaborar un documento de consenso, basado en la evidencia científica, que recoge las recomendaciones para el tratamiento antibiótico de las infecciones graves causadas por cocos grampositivos en el paciente crítico y que ayude en la toma de decisiones asistenciales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In recent years, an increment of infections caused by gram-positive cocci has been documented in nosocomial and hospital-acquired infections. In diverse countries, a rapid development of resistance to common antibiotics against gram-positive cocci has been observed. This situation is exceptional in Spain but our country might be affected in the near future. New antimicrobials active against these multi-drug resistant pathogens are nowadays available. It is essential to improve our current knowledge about pharmacokinetic properties of traditional and new antimicrobials to maximize its effectiveness and to minimize toxicity. These issues are even more important in critically ill patients because inadequate empirical therapy is associated with therapeutic failure and a poor outcome. Experts representing two scientific societies (Grupo de estudio de Infecciones en el Paciente Critico de la SEIMC and Grupo de trabajo de Enfermedades Infecciosas de la SEMICYUC) have elaborated a consensus document based on the current scientific evidence to summarize recommendations for the treatment of serious infections caused by gram-positive cocci in critically ill patients.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[infecciones por cocos grampositivos]]></kwd>
<kwd lng="es"><![CDATA[pacientes críticos]]></kwd>
<kwd lng="es"><![CDATA[recomendaciones terapéuticas]]></kwd>
<kwd lng="en"><![CDATA[infections due by grampositive cocci]]></kwd>
<kwd lng="en"><![CDATA[critically ill patients]]></kwd>
<kwd lng="en"><![CDATA[therapeutic recommendations]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana" size="2"><b>ARTICULO ESPECIAL</b></font>     <p align="left">&nbsp;     <p align="left"><B><font face="Verdana" size="4"><a name="TOP"></a>Recomendaciones GEIPC-SEIMC y GTEI-SEMICYUC para el  tratamiento antibiótico de infecciones por cocos grampositivos en el paciente  crítico</font></B>     <p align="left"><B><font face="Verdana" size="4">GEIPC-SEIMC and GTEI-SEMICYUC recommendations for  antibiotic treatment of gram positive coccal infections in the critical  patient</font></B></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><FONT face=Verdana size=2><b>PM Olaechea Astigarraga <SUP>a</SUP>, J Garnacho Montero  <SUP>b</SUP>, S Grau Cerrato <SUP>c</SUP>, O Rodríguez Colomo <SUP>d</SUP>,&nbsp;    <br> M  Palomar Martínez <SUP>e</SUP>, R Zaragoza Crespo <SUP>f</SUP>, P Muñoz  García-Paredes <SUP>g</SUP>, E Cerdá Cerdá <SUP>h</SUP>, F Álvarez Lerma  <SUP>i</SUP> </b></FONT> </p>     <p align="left"><FONT face=Verdana size=2>     <BR><SUP>a </SUP>Servicio de Medicina Intensiva. Hospital de Galdakao. Vizcaya. (GEIPC).<SUP>    ]]></body>
<body><![CDATA[<br> b </SUP>Servicio de Cuidados Críticos y Urgencias. Hospital  Universitario Virgen del Rocío. Sevilla. (GTEI).<SUP>    <br> c </SUP>Servicio de  Farmacia. Hospital del Mar. Barcelona. (GEIPC).<SUP>    <br> d </SUP>Servicio de  Medicina Intensiva. Hospital Clínico Universitario. Valencia. (GTEI).<SUP>    <br> e </SUP>Servicio de Medicina Intensiva. Hospital Vall D'Hebron.  Barcelona. (GEIPC).<SUP>    <br> f </SUP>Servicio de Medicina Intensiva. Hospital  Universitario Dr. Peset. Valencia. (GTEI).<SUP>    <br> g </SUP>Servicio de  Microbiología Clínica. Hospital General Universitario Gregorio Marañón. Madrid. (GEIPC).<SUP>    <br> h </SUP>Servicio de Medicina Intensiva. Hospital Universitario  de Getafe. Madrid. (GTEI).<SUP>    <br> i </SUP>Servicio de Medicina Intensiva.  Hospital del Mar. Barcelona. (GEIPC).</FONT> </p>     <p align="left"><font face="Verdana" size="2"><u><a href="#back">Dirección para correspondencia</a></u></font> </p>     <p align="left">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="left">&nbsp;</p> <hr size="1">     <p align="left"><FONT face=Verdana size=2><b>RESUMEN</b></FONT> </p>     <p align="left"><FONT face=Verdana size=2>En los últimos años se  ha constatado un incremento en las infecciones causadas por cocos grampositivos  tanto en infecciones comunitarias como nosocomiales. En algunos países, se ha  observado un rápido desarrollo de resistencias a los antibióticos habitualmente  empleados para su tratamiento, y se supone que esa situación puede llegar en el  futuro a nuestro país. Se están desarrollando nuevos antimicrobianos  específicamente dirigidos para el tratamiento de estas infecciones, pero es  necesario profundizar en el conocimiento de las propiedades farmacocinéticas de  los antibióticos tanto antiguos como nuevos, para aprovechar al máximo sus  cualidades frente a estos patógenos y evitar en lo posible su toxicidad. En el  paciente crítico estos problemas son más acuciantes, ya que la inadecuación del  tratamiento, tanto en la elección del antibiótico como en la dosis y en la  administración, se acompañan frecuentemente de fracasos terapéuticos y por tanto  de mal pronóstico.    <br> Expertos de dos grupos de trabajo de dos Sociedades científicas,  pertenecientes al Grupo de estudio de Infecciones en el Paciente Crítico de la  SEIMC (GEIPC-SEIMC) y al Grupo de trabajo de Enfermedades Infecciosas de la  SEMICYUC (GTEI- SEMICYUC) se han reunido con el objetivo de elaborar un  documento de consenso, basado en la evidencia científica, que recoge las  recomendaciones para el tratamiento antibiótico de las infecciones graves  causadas por cocos grampositivos en el paciente crítico y que ayude en la toma  de decisiones asistenciales.&nbsp;</FONT></p>     <P align=left><FONT face=Verdana size=2><b> Palabras clave</b>: infecciones por cocos  grampositivos, pacientes críticos, recomendaciones  terapéuticas.</FONT> <hr size="1">     <P align=left><font face="Verdana" size="2"><b>ABSTRACT</b></font>      <P align=left><FONT face=Verdana size=2>In recent years, an increment of infections caused by  gram-positive cocci has been documented in nosocomial and hospital-acquired  infections. In diverse countries, a rapid development of resistance to common  antibiotics against gram-positive cocci has been observed. This situation is  exceptional in Spain but our country might be affected in the near future. New  antimicrobials active against these multi-drug resistant pathogens are nowadays  available. It is essential to improve our current knowledge about  pharmacokinetic properties of traditional and new antimicrobials to maximize its  effectiveness and to minimize toxicity. These issues are even more important in  critically ill patients because inadequate empirical therapy is associated with  therapeutic failure and a poor outcome.    <br> Experts representing two scientific societies (Grupo de estudio de  Infecciones en el Paciente Critico de la SEIMC and Grupo de trabajo de  Enfermedades Infecciosas de la SEMICYUC) have elaborated a consensus document  based on the current scientific evidence to summarize recommendations for the  treatment of serious infections caused by gram-positive cocci in critically ill  patients.</FONT>      <P align=left><FONT face=Verdana size=2><b>Key words</b>: infections due by grampositive cocci, critically ill  patients, therapeutic recommendations.</FONT> <hr size="1">     <P align=left>&nbsp;      ]]></body>
<body><![CDATA[<P align=left><B><font face="Verdana" size="3">Introducción</font></B>     <P><FONT face=Verdana size=2>En los últimos estudios epidemiológicos  relacionados con infecciones en pacientes hospitalizados, se han constatado dos  hechos: el incremento del porcentaje de infecciones por cocos grampositivos  (CGP)<SUP>1</SUP> y el desarrollo de resistencias bacterianas a los antibióticos  empleados. Este problema es más acuciante en lo pacientes ingresados en Unidades  de Cuidados Intensivos (UCI)<SUP>2,3</SUP>, por lo que, en estos pacientes la  elección del tratamiento antibiótico y su adaptación (ajuste o desescalada) a  cada momento de la evolución deba ser una práctica basada en el conocimiento  profundo de las posibilidades terapéuticas, así como de las peculiaridades  farmacocinéticas que afectan a los pacientes críticos.</FONT></P>     <P><FONT face=Verdana size=2>En las UCI se dispone de la posibilidad de  administrar fármacos por diferentes vías de las habituales (perfusión continua,  vía inhalatoria, intratecal, etc.), y una mayor facilidad para la monitorización  de antimicrobianos, lo que hace que el tratamiento de enfermedades infecciosas  en pacientes críticos tenga matices diferentes a los de los pacientes ingresados  en plantas de hospitalización.</FONT></P>     <P><FONT face=Verdana size=2>Dos grupos de trabajo dedicados al estudio  de infecciones en el paciente crítico, y desde un punto de vista  multidisciplinario, hemos abordado el problema del tratamiento antibiótico de  las infecciones por CGP en el paciente crítico elaborando las recomendaciones  que a continuación se exponen. Tanto el Grupo de Estudio de Infecciones en el  Paciente Crítico de la Sociedad Española de Enfermedades Infecciosas y  Microbiología Clínica (GEIPC&shy;SEIMC) como el Grupo de Trabajo de Enfermedades  Infecciosas de la Sociedad Española de Medicina Intensiva, Crítica y de Unidades  Coronarias (GTEI&shy;SEMICYUC) designó unos expertos, que acometieron estas  recomendaciones para presentarlas a sus respectivas Sociedades, centrándose en  el tratamiento antimicrobiano de las infecciones más frecuentes en pacientes  críticos con sospecha o confirmación de ser causadas por CGP.</FONT></P>     <P>&nbsp;</P>     <P><B><font face="Verdana" size="3">Metodología</font></B></P>     <P><FONT face=Verdana size=2>Tanto el GEIPC-SEIMC como el GTEI-SEMICYUC  nombraron entre sus miembros a un coordinador y 3 expertos. Además, cada Grupo  de Trabajo designó un revisor que supervisaría las decisiones y grados de  recomendación decididos por el panel. En total se seleccionó un grupo  multidisciplinario de 10 participantes elegidos por su experiencia en el  tratamiento de infecciones en el paciente crítico. El grupo incluye médicos  intensivistas, un microbiólogo y un farmacólogo. Se decidió no abordar las  infecciones en las que no intervengan los CGP, ni las que sean muy infrecuentes  en pacientes críticos. Tampoco se han hecho consideraciones de índole económica,  referencias a tratamientos secuenciales, ni a fármacos no comercializados  actualmente en nuestro país, aunque estos aspectos también deben ser tenidos en  cuenta a la hora de elegir el antibiótico más adecuado.</FONT></P>     <P><FONT face=Verdana size=2>Las recomendaciones que se presentan se han  desarrollado según estándares previamente aceptados<SUP>4</SUP> y aplicando la  normativa propuesta por la <I>Infectious Diseases Society of America</I>  (IDSA)<SUP>5</SUP>. Se ha aplicado esta normativa (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab01.gif" target="_blank">tabla 1</a>) considerando  independiente la fuerza de la recomendación del nivel de evidencia. Algunas de  las recomendaciones, sobre todo las de los tratamientos alternativos, se hacen  en ausencia de ensayos aleatorizados específicos, aunque el grado de la  recomendación pueda ser alto en base a la experiencia clínica de los miembros  del panel, a las recomendaciones de otras guías, a la ausencia de otras  posibilidades o por la extrapolación de los datos obtenidos en otras poblaciones  o de datos de laboratorio de microbiología. Para los ensayos clínicos  aleatorizados, adecuadamente realizados, comparativos de la eficacia de dos  tratamientos antibióticos en infecciones y referidos a poblaciones de pacientes  críticos, y si la eficacia es equivalente, se ha considerado que ambos  antibióticos cumplen el nivel de evidencia I (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab01.gif" target="_blank">tabla 1</a>).</FONT></P>     <P><B><FONT face=Verdana size=2>Organización general</FONT></B></P>     <P><FONT face=Verdana size=2>Se realizó una reunión entre los dos  coordinadores el 11 de noviembre de 2005 decidiéndose la estructura del proyecto  y los ponentes de cada uno de los temas. Se decidió limitar las recomendaciones  al tratamiento empírico de las infecciones en pacientes críticos con datos  microbiológicos de sospecha de infección por CGP (tinción de Gram, antigenuria  de neumococo, etc.) así como el tratamiento dirigido de las mismas.</FONT></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>Posteriormente, se realizó una búsqueda  sistemática de la literatura siguiendo fórmulas previamente  recomendadas<SUP>6</SUP>. Se llevó a cabo una búsqueda computarizada en Medline  y Current Contents en el período entre enero de 1975 y diciembre de 2005. Las  palabras clave (<I>Key words</I>) fueron: <I>Gram-positive</I>,  <I>Staphylococcus, Streptococcus</I>, <I>pneumonia</I>, <I>bacteremia</I>,  <I>peritonitis</I>, <I>soft-tissue infection</I>, <I>urinary infection</I>,  <I>endocarditis</I>, <I>meningitis</I>, <I>guidelines</I>, <I>critically  ill</I>, <I>intensive Care</I> y <I>treatment</I>. Se revisaron manualmente los  abstracts publicados en los últimos 5 años en los Congresos de la <I>European  Society of Intensive Care Medicine</I> (ESICM), de la <I>European Society of  Clinical Microbiology and Infectious Diseases</I> (ESCMID) y de la  <I>Interscience Conference on Antimicrobial Agents and Chemotherapy</I>   (ICAAC).</FONT></P>     <P><FONT face=Verdana size=2>Se realizó una reunión con la participación  de todos los autores del presente manuscrito el día 11 de enero de 2006. En ella  se presentaron las propuestas de tratamiento y se procedió a discutir las  recomendaciones terapéuticas así como el nivel de evidencia de cada una de  ellas. En caso de discrepancia se tomaron las decisiones por mayoría. Tras la  evaluación de varios borradores, el 9 de junio de 2006 hubo otra reunión en la  que se actualizaron las referencias bibliográficas y se acordaron los niveles de  recomendación.</FONT></P>     <P><FONT face=Verdana size=2>La celebración de estas reuniones ha sido  patrocinada por Pfizer que no ha influido en ningún momento en el diseño,  resoluciones y publicaciones de las recomendaciones. Todos los participantes han  hecho una declaración de conflicto de intereses que se detalla al final del  manuscrito.</FONT></P>     <P>&nbsp;</P>     <P><B><font face="Verdana" size="3">Características de los antimicrobianos empleados en el tratamiento de infecciones por bacterias grampositivas en paciente crítico</font></B></P>     <P><FONT face=Verdana size=2>Desde el descubrimiento de la penicilina  hasta la actualidad, se han desarrollado múltiples antibióticos con actividad  frente a CGP. Sin embargo, la mayoría de ellos presentan un espectro de  actividad que abarca tanto CGP como gramnegativos. Cloxacilina, vancomicina y,  posteriormente, teicoplanina fueron desarrollados para combatir infecciones  producidas, exclusivamente, por CGP. Recientemente se han diseñado una serie de  moléculas que cubren las limitaciones de eficacia y/o seguridad de las que  habían estado disponibles hasta la actualidad. En España se hallan  comercializadas linezolid y quinupristina/dalfopristina, aunque la utilización  en la clínica de este último fármaco es prácticamente nula. Las características  farmacocinéticas más destacables de los antibióticos más utilizados en las  infecciones producidas por CGP se resumen en la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab02.gif" target="_blank"> tabla 2</a>.</FONT></P>     <P><FONT face=Verdana size=2>Tradicionalmente se ha recomendado la  monitorización de niveles plasmáticos de vancomicina, basándose en la relación  existente entre las concentraciones plasmáticas de este antibiótico y su perfil  de eficacia y toxicidad. Debe realizarse siempre que se emplee en pacientes  críticos. Cuando se administran dosis múltiples, las determinaciones (a partir  del segundo - tercer día) de los niveles valle deben realizarse entre 30 y 60  minutos antes de la próxima dosis.</FONT></P>     <P><FONT face=Verdana size=2>La monitorización de niveles plasmáticos de  vancomicina, puede tener un gran valor predictivo de la eficacia del tratamiento  de infecciones graves. En base a la sobreestimación de la nefrotoxicidad se ha  propuesto como concentraciones mínimas (Cmin) óptimas valores de 10 mg/l. En la  actualidad se recomienda<SUP>7</SUP> utilizar dosis suficientes para alcanzar  Cmin entre 15-20 mg/l o incluso superiores en caso de infecciones del sistema  nervioso central.</FONT></P>     <P><FONT face=Verdana size=2>Una estrategia que se está extendiendo  consiste en la administración de vancomicina en perfusión continua, que se ha  relacionado con menor toxicidad y con mayor estabilidad y rapidez para alcanzar  concentraciones terapéuticas<SUP>8,9</SUP>. La perfusión continua de vancomicina  debe ir precedida de la administración de una dosis de carga. Un reciente  estudio<SUP>10</SUP> en pacientes con neumonía, demuestra una mayor  supervivencia de los tratados con perfusión continua, aunque el estudio no fue  diseñado para evaluar este efecto. En un metaanálisis, la administración de la  misma dosis de antibióticos concentración-dependiente en régimen de dosis  múltiples se relacionó con un mayor número de fallos terapéuticos que con el  régimen de perfusión continua<SUP>11</SUP>. La administración de vancomicina en  perfusión continua, alcanzando los niveles plasmáticos propuestos anteriormente,  puede ser una estrategia más beneficiosa y costo-efectiva<SUP>12</SUP> que la  administración intermitente de este glucopéptido.</FONT></P>     <P><FONT face=Verdana size=2>Al emplear teicoplanina, es importante  administrar la dosis de carga (6 mg/kg/12 horas en las primeras tres dosis) para  alcanzar con mayor rapidez los niveles terapéuticos, a pesar de lo cual no se  logran hasta el tercer día<SUP>13</SUP>. Las dosis óptimas de teicoplanina  deberían ajustarse mediante la monitorización de niveles  plasmáticos<SUP>13,14</SUP>, lo que no es posible en la práctica clínica  rutinaria y por tanto condiciona el empleo de este glucopéptido en ciertas  situaciones. Por el contrario, se ha observado que el régimen de linezolid en  dosis de 600 mg/12 horas, puede considerarse adecuado en pacientes críticos sin  necesidad de medir niveles plasmáticos<SUP>14</SUP>.</FONT></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>Los pacientes críticos presentan frecuentes  variaciones en el volumen de distribución que dificultan la interpretación de  los niveles plasmáticos de los distintos antimicrobianos, por lo que se está  investigando con mayor profundidad en una serie de relaciones  farmacocinéticas/farmacodinámicas (PK/PD), que han demostrando tener relación  con la eficacia terapéutica<SUP>15</SUP>. Se ha observado que la relación entre  la concentración máxima (Cmax) y la concentración mínima inhibitoria (CMI) por  encima de 12 y el cociente del área bajo la curva (AUC) y la CMI (AUC/ CMI)  entre 30 y 40 horas son parámetros útiles para optimizar el tratamiento de las  infecciones respiratorias por CGP tratadas con quinolonas y evitar la selección  de flora resistente<SUP>16</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En el caso de los glucopéptidos y  linezolid, el parámetro que mejor predice la eficacia es el área bajo la curva  superior a la CMI (AUIC). Valores de AUC24/ CMI o AUIC inferiores a 400 horas se  asociaron con una menor erradicación microbiológica en pacientes con neumonía  por <I>Staphylococcus aureus</I> resistente a meticilina (SARM) tratados con  vancomicina<SUP>17,18</SUP>. En otro estudio, se demostró que valores de este  indicador cercanos a 153 para vancomicina libre fueron excelentes para el  tratamiento de infecciones respiratorias por <I>S. aureus</I><SUP>19</SUP>,  mientras que, valores de AUIC mayores que 125 se han considerado pronóstico de  fallos terapéuticos en el tratamiento de infecciones por <I>Enterococcus  faecium</I><SUP>20</SUP>. Para linezolid valores de AUIC entre 50 y 100 se han  considerado suficientes para garantizar buenos resultados  terapéuticos<SUP>21</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab03.gif" target="_blank"> tabla 3</a> se muestran las dosis de los  antimicrobianos con actividad frente a los CGP así como los ajustes de dosis en  situación de insuficiencia renal<SUP>22</SUP>. A lo largo del documento, si no  se especifica una pauta especial, las dosis a emplear son las recogidas en esta  tabla. Sin embargo, hay dos entidades en las que es necesario el empleo de dosis  máximas como son las infecciones del sistema nervioso central y las  endocarditis, por lo que las dosis necesarias para el tratamiento de estas  infecciones se recogen en la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab04.gif" target="_blank"> tabla 4</a>. Con respecto a las infecciones del sistema  nervioso central conviene hacer algunas consideraciones especiales sobre la  farmacodinamia de algunos antibióticos.</FONT></P>     <P><B><FONT face=Verdana size=2>Farmacodinámica de los antibióticos  útiles en el tratamiento de las infecciones del sistema nervioso central por  CGP</FONT></B></P>     <P><FONT face=Verdana size=2>En el tratamiento de las infecciones del  sistema nervioso central es especialmente importante la capacidad del  antibiótico para atravesar la barrera hematoencefálica (BHE). Es imprescindible  que la concentración del antibiótico en el líquido cefalorraquídeo (LCR) sea  superior a la concentración mínima bactericida, es decir, que el llamado índice  bactericida sea superior a 1, siendo óptimo<SUP>23</SUP> un valor de 10. La  inflamación meníngea incrementa hasta 10 veces la difusión de los antibióticos,  fenómeno que decrece rápidamente en 24-48 horas de comenzado el tratamiento, si  esta inflamación disminuye. Los antibióticos que durante la inflamación meníngea  no alcanzan en LCR el 20% de la concentración en plasma (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab02.gif" target="_blank">tabla 2</a>), atraviesan  escasamente la BHE cuando la inflamación meníngea disminuye, por lo que no son  adecuados para el tratamiento de estas infecciones.</FONT></P>     <P><FONT face=Verdana size=2>El objetivo del tratamiento es la rápida  esterilización del LCR, por lo que deben utilizarse antibióticos con rápida  actividad bactericida y a la dosificación más alta posible (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab04.gif" target="_blank">tabla 4</a>). La  esterilización tardía del LCR se ha relacionado con una mayor incidencia de  secuelas neurológicas<SUP>24</SUP>. Si no es posible lograr la concentración  adecuada mediante la administración por vía sistémica, se puede recurrir a la  instilación directa por vía intraventricular o intratecal.</FONT></P>     <P><FONT face=Verdana size=2>Los betalactámicos difunden mal al LCR.  Ceftriaxona y cefotaxima tienen similar capacidad para atravesar la BHE. La  dosis máxima de ceftriaxona recomendada es de 4 g/día por la posibilidad de  aparición de barro biliar. Esta dosis puede ser insuficiente para el tratamiento  de cepas con CMI elevadas, por lo que en estos casos se recomienda administrar cefotaxima.</FONT></P>     <P><FONT face=Verdana size=2>Entre los glucopéptidos, la teicoplanina  prácticamente no difunde al LCR y la vancomicina lo hace de forma irregular  (5-40% de las concentraciones plasmáticas) (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab02.gif" target="_blank">tabla 2</a>). Con frecuencia, estas  concentraciones son infraterapéuticas (además la dexametasona puede disminuir la  penetración de vancomicina en LCR) por lo que es imprescindible monitorizar las  concentraciones plasmáticas en el valle, para mantener niveles de 20 a 30 mg/l.  Se ha recomendado la administración de vancomicina en perfusión  continua<SUP>25</SUP> (50&shy;60 mg/kg/día previa administración de una dosis de  carga de 15 mg/kg) con lo que se pueden mantener concentraciones plasmáticas  entre 25-30 mg/l y concentraciones en LCR entre 6-19 mg/l, que son adecuadas  para el tratamiento de patógenos sensibles.</FONT></P>     <P><FONT face=Verdana size=2>Linezolid atraviesa muy bien la BHE, con  concentraciones en LCR del 70% de las concentraciones plasmáticas y de hasta el  160% en meningitis, alcanzando cifras muy por encima de las CMI de los  microorganismos sensibles<SUP>26</SUP>.</FONT></P>     <P><B><FONT face=Verdana size=2>Efectos adversos e interacciones de  antimicrobianos administrados en infecciones por CGP</FONT></B></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>En la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab05.gif" target="_blank"> tabla 5</a> se describen los efectos  adversos que se presentan en un porcentaje superior al 1% al utilizar este grupo  de antibióticos. Quinupristina/ dalfopristina presenta una frecuencia elevada de  efectos adversos en la zona de administración. Con linezolid se ha observado  riesgo de trombocitopenia en pacientes críticos con trombocitopenia  previa<SUP>27</SUP> así como anemia y trombocitopenia en pacientes con  insuficiencia renal grave<SUP>28</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Se debe tener en cuenta las interacciones  entre los antimicrobianos y otros fármacos a dministrados concomitantemente cuya  descripción excede nuestro propósito<SUP>29</SUP>. Ya se ha comentado la  posibilidad de fracaso renal asociando vancomicina a otros fármacos  nefrotóxicos. Otros ejemplos de interacciones de interés son el excesivo efecto  de relajantes musculares asociados a gentamicina o clindamicina, los efectos  arritmógenos de quinolonas junto a algunos antiarrítmicos, el síndrome  serotoninérgico combinando linezolid con inhibidores de la recaptación de  serotonina o la acción sobre el metabolismo de algunos medicamentos que provoca rifampicina.</FONT></P>     <P><B><FONT face=Verdana size=2>Nuevos antimicrobianos para el  tratamiento de infecciones por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>En los últimos años han aparecido diversos  fármacos con actividad específica frente a microorganismos grampositivos  multiresistentes. Actualmente se hallan en fases avanzadas de investigación o  comercialización. Después de la redacción de estas recomendaciones (finalizadas  en septiembre de 2006) se ha aprobado en nuestro país el empleo de daptomicina y  tigeciclina, para las indicaciones que a continuación se especifican, que  seguramente serán ampliadas en los próximos meses, lo que debe tenerse en cuenta  a la hora de plantear estrategias terapéuticas en el futuro. La experiencia con  estos antibióticos en pacientes críticos es aún escasa. Daptomicina es un  antibiótico lipopéptido aprobado para el tratamiento de infecciones de piel y  tejidos blandos<SUP>30</SUP>. En un reciente estudio ha demostrado una eficacia  similar a vancomicina en el tratamiento de las bacteriemias y endocarditis por  CGP<SUP>31</SUP>, aunque aún no ha sido aprobado para esta indicación. Se ha  descartado su uso en neumonía porque su efecto es inhibido por el surfactante  pulmonar<SUP>32</SUP>. Recientemente se ha aprobado tigeciclina, una  glicilciclina derivada de las tetraciclinas, para el tratamiento de infecciones  de piel y tejidos blandos e infecciones abdominales<SUP>33,34</SUP>. Este  antibiótico posee actividad, además, frente a varios microorganismos  gramnegativos como <I>Acinetobacter</I> spp. y enterobacterias productoras de  betalactamasas de espectro extendido (BLEE).</FONT></P>     <P><FONT face=Verdana size=2>Dalbavancina, es un lipoglicopéptido que ha  demostrado una eficacia similar a vancomicina en el tratamiento de las  infecciones de piel y tejidos blandos<SUP>35</SUP>. Posee una farmacocinética  muy interesante ya que el tratamiento completo incluye una dosis semanal durante  dos semanas. Telavancina presenta una estructura similar a dalvabancina y ha  demostrado una eficacia similar a los antibióticos antiestafilocócicos en el  tratamiento de infecciones de piel y tejidos blandos<SUP>36</SUP> y superior a  vancomicina en el tratamiento de la bacteriemia relacionada con  catéter<SUP>37</SUP>. Finalmente, ceftobiprole, es la primera cefalosporina con  actividad frente al SARM incluso con sensibilidad reducida a  vancomicina<SUP>38</SUP>, manteniendo la actividad de otras cefalosporinas  frente a bacilos gramnegativos, incluyendo <I>Pseudomonas aeruginosa</I>, pero  no frente a enterobacterias productoras de BLEE.</FONT></P>     <P>&nbsp;</P>     <P><B><FONT face=Verdana size=3>Tratamiento de la neumonía nosocomial por cocos grampositivos</FONT></B></P>     <P><FONT face=Verdana size=2>La neumonía asociada a ventilación mecánica  (NAV) es la forma más frecuente de neumonía nosocomial (NN) entre los pacientes  críticos<SUP>39</SUP>. Según datos del ENVIN-UCI alrededor del 15-20% de los  pacientes ventilados desarrolla NAV mientras que la densidad de incidencia  oscila entre 17 y 23 por 1.000 días de ventilación mecánica<SUP>40.</SUP> La NN  es la infección nosocomial que se asocia con las mayores tasas de mortalidad,  aumento de las estancias y con un costo asociado muy elevado<SUP>41</SUP>. La  adecuación del tratamiento empírico es fundamental en la evolución de los  pacientes<SUP>42-44</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En las NN adquiridas en UCI los  aislamientos de CGP suponen entre el 20 y el 28% del total de  microorganismos<SUP>39</SUP>. La presencia de CGP se ha incrementado  considerablemente en la última década debido al aumento de aislamientos de <I>S.  aureus</I>, que se ha convertido en el primer agente causante de NAV en nuestro  medio. <I>S. aureus</I> sensible a meticilina (SASM) predomina en las NAV  desarrolladas en los 5-7 primeros días de estancia en la UCI, mientras que en  las NAV tardías, de más de 7 días de estancia en UCI, el 60% del total de <I>S.  aureus</I> son SARM (datos del informe ENVIN-UCI de 2005). Los factores de  riesgo para NAV por SARM incluyen el tratamiento antibiótico previo, la  procedencia de centros de larga estancia, NAV de presentación tardía así como la  presencia de brotes o la flora propia de cada UCI<SUP>45</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Otros CGP a tener en cuenta son  <I>Streptococcus pneumoniae</I> en las NAV tempranas, presente entre el 3-5% de  los casos y <I>E. faecalis</I>, en menos del 2%. Aunque en estudios  epidemiológicos y más raramente en trabajos de investigación se recoge la  presencia de <I>Staphylococcus epidermidis</I>, el papel patogénico de este  microorganismo queda por delimitar y no se incluye en estas  recomendaciones.</FONT></P>     ]]></body>
<body><![CDATA[<P><B><FONT face=Verdana size=2>Recomendaciones para el tratamiento de  neumonía nosocomial por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>En la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab06.gif" target="_blank"> tabla 6</a> se recogen las principales  recomendaciones para el tratamiento de la neumonía nosocomial con el grado de  recomendación y las referencias bibliográficas en las que se sustenta.  Disponemos de numerosos estudios que evalúan el tratamiento de la  NN<SUP>46-55</SUP>. Sin embargo, el número de pacientes críticos con NN causadas  por CGP en los ensayos aleatorizados es reducido, especialmente en los estudios  más antiguos. En la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab06.gif" target="_blank"> tabla 6</a> se recogen las principales recomendaciones para el  tratamiento de la neumonía nosocomial.</FONT></P>     <P align="left"><I><FONT face=Verdana size=2>Tratamiento empírico de neumonía  nosocomial sin factores de riesgo de CGP resistentes</FONT></I></P>     <P><FONT face=Verdana size=2>No hay estudios específicamente diseñados  para evaluar la eficacia de diferentes antibióticos en la neumonía nosocomial  sin factores de riesgo de presencia de CGP multiresistentes (generalmente  neumonía precoz asociada a ventilación mecánica). Las recomendaciones se basan  en la sensibilidad de los microorganismos que se espera aislar, muy  probablemente sensibles a betalactámicos y teóricamente sin diferencias entre  los distintos betalactámicos propuestos (A-III)<SUP>56,57</SUP>. Como  alternativa se propone levofloxacino (B-II) que ha sido estudiado para el  tratamiento de NAV<SUP>58,59</SUP>. La posible asociación del uso de quinolonas  con la selección de SARM<SUP>60</SUP> o el posible desarrollo de resistencias  hace que el panel de expertos se decante más por el empleo de betalactámicos que  por levofloxacino. No hay estudios específicos en pacientes alérgicos a  betalactámicos, pero el empleo de levofloxacino parece la opción más razonable  (A-III).</FONT></P>     <P><font size="2"><I><FONT face=Verdana>Tratamiento dirigido de neumonía  nosocomial por</FONT></I> <FONT face=Verdana> S. aureus <I>sensible a meticilina</I></FONT></font></P>     <P><FONT face=Verdana size=2>El tratamiento de elección debe ser  oxacilina (A-I). Dada la elevada mortalidad de la neumonía bacteriémica por  <I>S. aureus</I> sensible a meticilina tratada con vancomicina<SUP>54</SUP>, si  se ha iniciado tratamiento con un glucopéptido es mandatorio cambiar a  cloxacilina. No hay recomendaciones con respecto a otras  alternativas.</FONT></P>     <P><I><FONT face=Verdana size=2>Tratamiento empírico de neumonía con  factores de riesgo para presentar CGP resistentes o tratamiento dirigido a  SARM</FONT></I></P>     <P><FONT face=Verdana size=2>En pacientes en los que se sospeche o se  confirme el aislamiento de SARM como causante de la neumonía, el tratamiento  clásico de elección ha sido la vancomicina (A-I). No obstante, este tratamiento  ha sido considerado sub-óptimo por algunos autores, ya que vancomicina es un  antibiótico de elevado peso molecular que no alcanza concentraciones altas a  nivel pulmonar<SUP>7</SUP> por lo que se recomienda monitorizar los niveles  plasmáticos para obtener Cmin séricas de 20 mgl<SUP>l7,61</SUP>. Con estos  niveles, Combes et al<SUP>62</SUP> no hallaron mortalidad atribuible en una  cohorte de 74 pacientes con NAV por SARM. En un estudio retrospectivo reciente  Rello et al<SUP>10</SUP> demostraron que el tratamiento con vancomicina en  perfusión continua fue un factor protector de mortalidad hospitalaria en una  cohorte de 75 pacientes con NAV por SARM. Aunque no se trataba de un ensayo  clínico diseñado para estudiar las diferencias en eficacia de esta forma de  administración y que un estudio aleatorizado<SUP>12</SUP>, con reducido número  de neumonías por SARM, no halló este beneficio (aunque sí fue costo-efectivo),  el panel recomienda considerar la perfusión continua de vancomicina en los casos  de NAV por SARM (B-II) siendo imprescindible la monitorización de los niveles  plasmáticos hasta alcanzar los recomendados (15-20 mg/l).</FONT></P>     <P><FONT face=Verdana size=2>La teicoplanina tiene las mismas  limitaciones farmacocinéticas que la vancomicina y no es posible en la práctica  clínica medir sus niveles séricos. Se ha demostrado<SUP>63</SUP> la necesidad de  administrar dosis muy elevadas durante los dos primeros días para alcanzar  niveles séricos y en el fluido de epitelio intersticial adecuados. En ausencia  de estudios clínicos que demuestren su eficacia, no recomendamos su uso en el  tratamiento de NN por SARM. Tampoco quinupristina-dalfopristina ha demostrado  superioridad a vancomicina en pacientes con neumonía por CGP, mientras que la  tasa de efectos adversos y de suspensión de tratamiento fue algo mayor, por lo  que el panel no recomienda emplear quinupristina-dalfopristina para el  tratamiento de las NN por CGP<SUP>53</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Se ha comparado la eficacia de linezolid  con vancomicina en dos ensayos clínicos aleatorizados y doble  ciego<SUP>64,65</SUP>, y posteriormente se han analizado de forma retrospectiva  todos los pacientes de estos ensayos con neumonía confirmada por SARM y los  casos de NAV<SUP>52,66</SUP>. La supervivencia fue mayor en el grupo tratado con  linezolid en comparación con el grupo tratado con vancomicina en dosis  discontinuas en el conjunto de pacientes con neumonía por SARM<SUP>52</SUP> (80%  frente a 63,5%; p = 0,03) y en aquellos con neumonía asociada a ventilación  mecánica causada por SARM<SUP>66</SUP> (84,1% frente a 61,7%; p = 0,02), lo cual  fue confirmado mediante un análisis multivariante, en el que el tratamiento con  linezolid fue un factor independiente de supervivencia hospitalaria (OR: 2,6; IC  95%: 1,3-5,1; p = 0,006). Según estos datos, el número de pacientes necesarios a  tratar con linezolid respecto a vancomicina para salvar una vida es de  6.</FONT></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>Las limitaciones que presentan estos  trabajos se basan en el hecho de que son análisis retrospectivos de dos ensayos  clínicos diseñados para demostrar no-inferioridad, que el número de episodios  con cultivos cuantitativos es limitado, que la dosificación de vancomicina (1 g  iv/12 horas) no es la más adecuada y que los niveles valle requeridos de  vancomicina (5-10 mg/l) son inferiores a los hoy recomendados. Por ello, se  considera que la evidencia para su elección como primera opción sería B-II. Dada  la excelente concentración que alcanza linezolid en tejido pulmonar, tanto en  voluntarios sanos<SUP>67</SUP> como en pacientes críticos<SUP>68</SUP>, hoy en  día se considera que este fármaco o vancomicina (niveles plasmáticos 15-20 mg/l)  constituyen el tratamiento de primera línea en la NN por SARM  (A-I)<SUP>69,70</SUP>. En pacientes hemodinámicamente inestables y en los que  existe un alto riesgo de padecer insuficiencia renal, el linezolid debe  contemplarse como primera elección<SUP>70</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>El panel cree indispensable que los  laboratorios de Microbiología determinen la CMI del SARM a vancomicina pues  dependiendo de la misma debe elegirse la terapia dirigida tal y como se refleja  en la tabla 6. Se ha demostrado la menor eficacia de vancomicina cuando la CMI  era mayor o igual que 1 mg/l<SUP>71</SUP> por lo que el panel recomienda en  estos casos el empleo de linezolid (A-III). Hay que reconocer que, al menos  hasta el año 2002, se ha comprobado en estudios de vigilancia realizados en  España que el 100% de los aislamientos de SARM presentan CMI a vancomicina menor  o igual que 1 mg/l<SUP>72,73</SUP>. Sin embargo, se han comunicado recientemente  algunos casos de SARM con CMI a vancomicina más elevadas en algunos hospitales  españoles<SUP>74</SUP>, lo que lleva a este panel, ante la posibilidad de que en  un futuro próximo se incremente el número de cepas de SARM con susceptibilidad  intermedia a vancomicina, como ya ocurre en algunos países  europeos<SUP>75</SUP>, a proponer que se determine exactamente la CMI a  vancomicina en los aislamientos significativos en pacientes críticos y por  tanto, se realizan las recomendaciones terapéuticas en base a esta posibilidad (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab06.gif" target="_blank">tabla 6</a>).</FONT></P>     <P><FONT face=Verdana size=2>La duración óptima de tratamiento se  considera que debe ser de 8 días y/o hasta 48 horas después la defervescencia de  los síntomas en las neumonías causadas por <I>S. pneumoniae</I> y <I>S.  aureus</I> sensible a meticilina (A-I). Sin embargo, en las NN por SARM el panel  recomienda 15 días, si bien 8 días podrían ser suficientes si el tratamiento  empírico ha sido adecuado y hay resolución clínica<SUP>76</SUP>  (B-III).</FONT></P>     <P>&nbsp;</P>     <P><B><font face="Verdana" size="3">Tratamiento de la neumonía adquirida en la comunidad por CGP que requieren ingreso en UCI</font></B></P>     <P><FONT face=Verdana size=2>La etiología más frecuente de la neumonía  comunitaria es el <I>S. pneumoniae</I>, siendo <I>S. aureus</I> el otro  microorganismo grampositivo más comúnmente implicado, si bien a gran  distancia<SUP>77</SUP>. El tratamiento antibiótico de toda neumonía grave de la  comunidad debe iniciarse precozmente ya que la demora en su inicio se asocia a  mayor mortalidad y morbilidad<SUP>78</SUP>.</FONT></P>     <P><B><FONT face=Verdana size=2>Recomendaciones para el tratamiento de  la neumonía adquirida en la comunidad por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>En la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab06.gif" target="_blank"> tabla 6</a> se recogen las principales  recomendaciones para el tratamiento de la neumonía adquirida en la  comunidad.</FONT></P>     <P><I><FONT face=Verdana size=2>Tratamiento empírico. Tinción de Gram o  antigenuria positiva de neumococo</FONT></I></P>     <P><FONT face=Verdana size=2>La antigenuria positiva de neumococo se  considera diagnóstico de esta etiología en presencia de un cuadro clínico  compatible y si no ha habido proximidad de otra infección neumocócica. Sin  conocer el antibiograma o la existencia de bacteriemia concomitante,  recomendamos el inicio del tratamiento con terapia combinada con cefotaxima o  ceftriaxona junto a levofloxacino (A-II). Existe amplia experiencia clínica de  tratamiento de neumonías comunitarias en pacientes ingresados en UCI con esta  combinación<SUP>79</SUP>, aunque no hay ensayos aleatorizados. Una alternativa  válida, sería el empleo de amoxicilina-clavulánico<SUP>80,81</SUP> en vez de la  cefalosporina, pero su empleo en pacientes críticos, para el tratamiento de esta  infección es menos frecuente, por lo que la fuerza de recomendación es menor  (B-II).</FONT></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>El empleo combinado de antibióticos para el  tratamiento de la neumonía neumocócica es en la actualidad un tema de debate.  Dos estudios retrospectivos<SUP>82,83</SUP> y uno prospectivo  observacional<SUP>84</SUP> han hallado que, en pacientes con neumonía  neumocócica bacteriémica, la terapia combinada se asocia a menor mortalidad que  la monoterapia. Por el contrario, otro estudio retrospectivo<SUP>85</SUP> no  halló diferencias en la mortalidad de pacientes con sepsis neumocócica tratados  con monoterapia o terapia combinada, si bien sus conclusiones pueden ser  discutibles<SUP>86</SUP>. Recomendamos la terapia combinada de inicio ante la  sospecha de neumonía neumocócica grave bacteriémica al menos durante 3 a 5 días  (A-III).</FONT></P>     <P><FONT face=Verdana size=2>Para la antibioterapia inicial, tenemos que  elegir antimicrobianos que incluyan el espectro posible de la neumonía  comunitaria y que tengan el menor porcentaje posible de resistencias dentro de  área que se está considerando. En España, la tasa de resistencia de neumococo a  macrólidos es elevada (entre el 30 y 50%)<SUP>87</SUP>. Por el contrario, menos  del 1% de cepas de <I>S. pneumoniae</I> son resistentes a  amoxicilina-clavulánico, cefalosporinas de tercera generación o  levofloxacino<SUP>88</SUP>. Aunque estos datos harían decantarse claramente a  favor de otras opciones que no incluyeran macrólidos, un estudio  retrospectivo<SUP>89</SUP> encuentra una mayor mortalidad en pacientes que han  recibido quinolonas en vez de otras combinaciones, sugiriendo que el efecto  inmunomodulador de los macrólidos, descrito por algunos autores, pueda jugar un  papel importante en la curación. Estos resultados deben confirmarse y sopesar el  posible efecto beneficioso frente a las resistencias, por lo que con los datos  actuales se recomienda el empleo de levofloxacino (A-II) en vez de macrólidos  (claritromicina o azitromicina). Se ha empleado levofloxacino en monoterapia en  neumonías comunitarias e n pacientes críticos, pero sin shock  séptico<SUP>90</SUP>, por lo que el panel recomienda, en esta situación clínica,  el empleo de levofloxacino siempre, al menos en los primeros días, en  combinación con otro antibiótico.</FONT></P>     <P><FONT face=Verdana size=2>En España, no existen prácticamente casos  de SARM como causa de neumonía adquirida en la comunidad. Por tanto, el  tratamiento empírico antes propuesto cubre la posibilidad de que el CGP  implicado sea <I>S. aureus</I>. Una vez conocido el antibiograma y si es  sensible a meticilina, podemos continuar con ceftriaxona o sustituir por cloxacilina.</FONT></P>     <P><font size="2"><I><FONT face=Verdana>Tratamiento dirigido.</FONT></I> <FONT face=Verdana> Streptococcus  pneumoniae</FONT></font></P>     <P><FONT face=Verdana size=2>Existe una amplia experiencia clínica  positiva con el empleo de ceftriaxona o cefotaxima en neumonías graves sin que  haya influido en la respuesta clínica el desarrollo de resistencias del  neumococo detectado en algunas áreas<SUP>91,92</SUP>, por lo que sigue siendo  tratamiento de primera línea<SUP>79</SUP> (A-II). Elegir entre el mantenimiento  de la cefalosporina o de levofloxacino, tras los días de terapia combinada, es  una cuestión no resuelta. Con niveles de resistencia a ceftriaxona de 2 mg/l, el  tratamiento con cefotaxima o ceftriaxona sigue siendo el recomendado (con la  adición de levofloxacino como se ha comentado en el apartado anterior), aunque  la experiencia clínica en neumonías causadas por cepas de <I>S. pneumoniae</I>  con este nivel de resistencia es mucho más escasa, por lo que la recomendación  es de menor consistencia (B-III). Es muy improbable que en infecciones  pulmonares se encuentren cepas de <I>S. pneumoniae</I> con resistencia más  elevada<SUP>93</SUP>, en cuyo caso el tratamiento debe adaptarse al antibiograma  (C-III). Para casos de alergia a betalactámicos con sensibilidad conocida se  debe emplear levofloxacino o macrólidos (claritromicina o azitromicina) según el antibiograma.</FONT></P>     <P><FONT face=Verdana size=2>Cuando existe sospecha de aspiración, el  tratamiento debe ampliarse a la cobertura de anaerobios por lo que se puede  sustituir la ceftriaxona por amoxicilina-clavulánico o ertapenem (A-III). No  existen estudios comparativos en estos casos, por lo que el nivel de evidencia  es bajo. Por otro lado, dos antimicrobianos recientemente introducidos en la  práctica clínica como linezolid y ertapenem han demostrado similar tasa de  respuesta clínica y microbiológica al compararlos con  ceftriaxona<SUP>94,95</SUP>, pero su uso queda restringido en la neumonía  comunitaria a situaciones muy específicas.</FONT></P>     <P><FONT face=Verdana size=2>La duración óptima del tratamiento  antimicrobiano en la neumonía comunitaria no ha sido establecida. Se recomienda  de 10 a 14 días en las formas graves, aceptándose cursos más cortos en neumonías  no graves<SUP>96</SUP> (C-III).</FONT></P>     <P>&nbsp;</P>     <P><B><FONT face=Verdana size=3>Tratamiento de las bacteriemias primarias y relacionadas con catéteres por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>Los sistemas de vigilancia de infección  nosocomial en las UCI de Norteamérica dan unas tasas de bacteriemias primarias y  relacionadas con catéter de 3,2 a 5,3 bacteriemias por mil días de  catéter<SUP>3,97</SUP>. En España el sistema ENVIN-UCI recoge una tasa media  nacional de 3,5 a 4,7 bacteriemias por mil días de catéter<SUP>98</SUP>. Los CGP  son los gérmenes más frecuentemente aislados tanto en las bacteriemias primarias  como en las relacionadas con catéter, representado el 50-60% de todos los  gérmenes cultivados. Los <I>Staphylococcus coagulasa</I> negativo constituyen el  35-50% de los aislamientos, el <I>S. aureus</I> el 15-20% y el  <I>Enterococcus</I> spp. el 5-10%.</FONT></P>     ]]></body>
<body><![CDATA[<P><B><FONT face=Verdana size=2>Recomendaciones para el tratamiento de  la bacteriemia primaria y asociada a catéter por CGP</FONT></B></P>     <P><I><FONT face=Verdana size=2>Tratamiento empírico</FONT></I></P>     <P><FONT face=Verdana size=2>El tratamiento empírico en el caso de  sospecha de bacteriemia relacionada por catéter es vancomicina  (A-I)<SUP>51,99-101</SUP> debido a que los microorganismos más frecuentemente  implicados son el <I>Staphylococcus coagulasa</I> negativo (en un 60-80%  resistentes a meticilina), SARM o <I>Enterococcus</I>  spp. (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab07.gif" target="_blank">tabla 7</a>). La  alternativa es teicoplanina o linezolid, aunque la experiencia de estos  antimicrobianos empleados como tratamiento empírico es menor que con vancomicina  (A-II)<SUP>51,102,103</SUP>. Ambos serían antibióticos de primera elección en  pacientes con elevado riesgo de desarrollar fracaso renal. El tratamiento  empírico debe completarse en algunas situaciones clínicas con un antibiótico  para cobertura de bacilos gramnegativos, e incluso para el tratamiento de  hongos, lo cual queda fuera del alcance de estas recomendaciones.</FONT></P>     <P><I><FONT face=Verdana size=2>Tratamiento dirigido</FONT></I></P>     <P><FONT face=Verdana size=2>Cuando el patógeno aislado es un  <I>Staphylococcus coagulasa</I> negativo sensible a meticilina se debe utilizar  cloxacilina o cefazolina, aunque por lo poco frecuente de este patrón de  sensibilidad el nivel de evidencia es bajo (B-III). Lo habitual es la  resistencia a meticilina, por lo que será necesario mantener el tratamiento  empírico inicial con vancomicina (A-I)<SUP>104</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Si el microorganismo aislado es un  <I>Staphylococcus aureus</I> sensible a meticilina, se recomienda emplear una  penicilina isoxazólica como cloxacilina (A-I), siendo las cefalosporinas de  primera generación una alternativa igualmente válida (A-II). El tratamiento de  bacteriemias por SASM con penicilinas antiestafilocócicas es más efectivo que  con glucopéptidos<SUP>105</SUP>. Comenzar el tratamiento con vancomicina en vez  de con un beta-lactámico se asocia con un mayor retraso en la negativización del  hemocultivo en las bacteriemias por SASM<SUP>106</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Para el tratamiento de bacteriemias por  SARM se recomienda el empleo de vancomicina (A-I), con las mismas salvedades  respecto a la nefrotoxicidad, que las referidas anteriormente y que apoyarían el  empleo de linezolid o teicoplanina (A-II) (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab07.gif" target="_blank">tabla 7</a>). El exceso de mortalidad  atribuida en pacientes críticos con bacteriemia por SARM (comparado con  pacientes con bacteriemia por SASM), sugiere que el tratamiento con  glucopéptidos es sub-óptimo para la atención de pacientes con esta  infección<SUP>107</SUP>. Por ello, hay que enfatizar la necesidad de alcanzar  niveles plasmáticos óptimos o plantear otras combinaciones como la adición de  rifampicina<SUP>108</SUP>, ya que en España el 95% de los SARM son sensibles a  este antibiótico<SUP>72</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Linezolid no se ha demostrado superior a  vancomicina al analizar los resultados de 5 ensayos clínicos que incluyeron 144  bacteriemias por SARM<SUP>101</SUP>. Sin embargo, linezolid ha resultado  superior a teicoplanina para el tratamiento de la bacteriemia en pacientes  hospitalizados<SUP>103</SUP>, y equivalente en pacientes críticos<SUP>102</SUP>,  aunque en ambos estudios no se trataba exclusivamente de pacientes con SARM.</FONT></P>     <P><FONT face=Verdana size=2>Si el <I>S. aureus</I> presenta CMI a  vancomicina menor o igual que 0,5 mg/l, el panel recomienda monoterapia con  vancomicina (A-I) siempre que los niveles terapéuticos se sitúen en 15-20 mg/l.  En el caso de    <BR><I>S. aureus</I> con CMI entre 1 y 4 mg/l, se puede emplear  vancomicina en perfusión continua, manteniendo niveles terapéuticos de 20-30  mg/l<SUP>61</SUP> asociado a rifampicina<SUP>108</SUP> o bien, linezolid en  monoterapia<SUP>109</SUP>. Si la CMI es mayor o igual que 8 mg/l debemos  guiarnos por antibiograma, siendo muy posiblemente linezolid la opción más  adecuada. Estas situaciones, de momento improbables en nuestro país, tienen  niveles bajos de recomendación y evidencia (C-III).</FONT></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>En casos de bacteriemia por  <I>Enterococcus</I> spp. sin endocarditis o meningitis, el tratamiento debe ser  ampicilina si la cepa es susceptible (B-II) no considerando oportuno la adición  de un aminoglucósido, pues la terapia combinada se ha demostrado que no modifica  el pronóstico<SUP>110</SUP>. Recomendamos tratar la bacteriemia por  <I>Enterococcus</I> spp resistente a ampicilina con vancomicina o teicoplanina  (B-II)<SUP>111,112</SUP>. La bacteriemia por <I>Enterococcus</I> spp. resistente  a vancomicina debe tratarse con linezolid (C-III). En esta situación no es  recomendable el uso de teicoplanina. Los fenotipos Van A son resistentes a  teicoplanina y los fenotipos Van B son sensibles, pero pueden hacerse  resistentes con la exposición a dicho antibiótico<SUP>113</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En la bacteriemia por <I>S. coagulasa</I>  negativo la duración del tratamiento es de 5 a 7 días retirando el catéter y  siempre que el paciente no sea portador de prótesis cardiaca o articular  (B-III). Si no se retira el catéter o el paciente es portador de prótesis  cardiaca o articular el tratamiento sistémico debe durar hasta 14 días (B-III).  La retirada del catéter venoso es mandatario en el caso de bacteriemia por <I>S.  aureus</I> y <I>Enterococcus</I> spp. Se ha demostrado que la no erradicación  del foco es un factor independiente de mortalidad en bacteriemia por SASM y  SARM<SUP>114</SUP>. En estos pacientes, se debe realizar un ecocardiograma  transesofágico (ETE) para descartar endocarditis (B-III). La duración del  tratamiento antibiótico se considera que debe ser de 14 días si el ETE es  negativo (C-III).</FONT></P>     <P>&nbsp;</P>     <P><B><FONT face=Verdana size=3>Tratamiento de las infecciones intraabdominales causadas por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>Los patógenos implicados en las peritonitis  secundarias son bacilos gramnegativos, anaerobios y entre los CGP sólo tiene un  papel relevante y a la vez discutido <I>Enterococcus</I> spp. En recientes  ensayos clínicos realizados en infecciones abdominales<SUP>115,116</SUP> la  etiología por CGP oscila entre el 7 y el 15% de los aislamientos, especialmente  y por orden de frecuencia a expensas de <I>Streptococcus</I> spp.,  <I>Enterococcus</I> spp. y en menor proporción <I>S. aureus</I>. En peritonitis  postoperatorias se incrementa la proporción de <I>Enterococcus</I>  spp.<SUP>117,118</SUP> y SARM<SUP>118</SUP>, mientras que en peritonitis  nosocomiales no postquirúrgicas esta proporción se mantiene similar a las  comunitarias<SUP>119</SUP>. Las peritonitis terciarias suelen estar causadas por  patógenos multirresistentes entre los que se encuentra <I>Enterococcus</I> spp.  y SARM. Presentan una elevada mortalidad que se ve influenciada tanto por el  retraso en la cirugía como por recibir tratamiento antibiótico empírico  inadecuado, bien sea en la selección, momento de prescripción, dosificación o en  la duración del mismo<SUP>120-122</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Los factores de riesgo que se han descrito  asociados al aislamiento de <I>Enterococcus</I> spp. son: shock en pacientes que  recibieron previamente cefalosporinas, inmunodepresión, portadores de prótesis  valvulares cardiacas, infección recurrente intraabdominal, larga estancia  hospitalaria, APACHE II mayor que 15, infección nosocomial y determinadas  localizaciones especialmente el foco colónico<SUP>123-126</SUP>. Algunos autores  han encontrado mayores complicaciones y mortalidad en peritonitis  postquirúrgicas en las que se ha aislado <I>Enterococcus</I>  spp.<SUP>123,124</SUP>.</FONT></P>     <P><B><FONT face=Verdana size=2>Recomendaciones para el tratamiento de  las infecciones intraabdominales por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>El tratamiento de las infecciones  intraabdominales debe basarse prioritariamente en el control quirúrgico del foco  de la infección (A-I), dado que su retraso se asocia a una mayor  mortalidad<SUP>127</SUP>. No se ha demostrado la superioridad de ninguna pauta  antibiótica sobre otra<SUP>128</SUP>. No se considerará necesaria la cobertura  antibiótica específica de <I>Enterococcus</I> spp. en peritonitis comunitarias  (A-I)<SUP>129</SUP>, por el contrario, se deben considerar como factores de  riesgo para ampliar cobertura antibiótica para CGP, el origen nosocomial (A-I) y  las peritonitis terciarias (A-I).</FONT></P>     <P><FONT face=Verdana size=2>En peritonitis nosocomial postoperatoria  con riesgo de aparición de <I>Enterococcus</I> spp. como primera elección el  panel recomienda el empleo de piperacilina-tazobactam o imipenem  (B-II)<SUP>115,116</SUP> o la combinación de cefepime más metronidazol y  ampicilina (C-III)<SUP>129,130</SUP>. Sin embargo, cuando la resistencia local  de enterococo a ampicilina es elevada debe usarse vancomicina. Asimismo, en  Unidades con alta incidencia de SARM, se debe considerar la utilización de  vancomicina o como alternativa, teicoplanina o linezolid. En alérgicos a  penicilina, la pauta debe incluir aminoglucósidos (o quinolonas) con  metronidazol y vancomicina, teicoplanina o linezolid (C-III).</FONT></P>     <P><FONT face=Verdana size=2>En la peritonitis terciaria debe incluirse  cobertura empírica de <I>Enterococcus</I> spp. y SARM por lo que a las pautas de  tratamiento anteriores debe añadirse vancomicina o teicoplanina, siendo la  alternativa linezolid (C-III)<SUP>129,130</SUP> aunque debe ajustarse el  tratamiento antibiótico según la sensibilidad (A-I).</FONT></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>El tratamiento antibiótico debe mantenerse  hasta 48 horas después de la defervescencia de los síntomas, signos de sepsis y  recuperación de la motilidad intestinal (C-III).</FONT></P>     <P>&nbsp;</P>     <P><B><font face="Verdana" size="3">Tratamiento de las infecciones urinarias causadas por CGP</font></B></P>     <P><FONT face=Verdana size=2>Alrededor del 8% de nuestros pacientes  presentan una infección urinaria adquirida en UCI, siendo más frecuentes en  mujeres y en enfermos médicos<SUP>131</SUP>. Datos del ENVIN muestran que las  infecciones urinarias suponen entre el 20 y 25% de las infecciones adquiridas en  UCI, con una densidad de incidencia de 5 a 7 episodios por 1.000 días de sondaje  vesical y confirman al foco urinario como responsable de alrededor del 15% de  las bacteriemias secundarias<SUP>2</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>La etiología por CGP en las infecciones  urinarias adquiridas en UCI suponen entre el 20 y el 25% del total de  aislamientos<SUP>131,132</SUP> principalmente por <I>E.  faecalis</I><SUP>98</SUP>, y en menor medida SARM y <I>Staphylococcus</I>  coagulasa negativo<SUP>133</SUP>. Las infecciones urinarias solamente suponen el  6,2% del total de infecciones causadas por SARM<SUP>51</SUP>. Son infecciones  tardías que se presentan en enfermos de larga estancia, y en un importante  porcentaje se asocian a bacteriemia<SUP>134</SUP>. El papel del  <I>Staphylococcus</I> coagulasa negativo como patógeno urinario está por  aclarar. Se deben considerar factores de riesgo para desarrollar infecciones  urinarias por CGP multiresistentes las infecciones nosocomiales, las adquiridas  en pacientes sometidos a manipulación urológica reciente y cuando el paciente ha  recibido tratamiento antibiótico previo.</FONT></P>     <P><B><FONT face=Verdana size=2>Recomendaciones para el tratamiento de  las infecciones urinarias por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>No hay ensayos clínicos específicos en los  que se hayan comparado distintas pautas antibióticas en pacientes críticos con  infecciones urinarias, por lo que las recomendaciones solamente pueden ser  hechas en base a la etiología, la sensibilidad y los efectos secundarios de los  antimicrobianos a administrar.</FONT></P>     <P><FONT face=Verdana size=2>En infecciones urinarias de la comunidad no  se debe considerar la cobertura de CGP, salvo su presencia en la tinción de  gram. Si aparecen CGP se deberá utilizar betalactámicos con actividad frente a  <I>E. faecalis</I> (A-I). En infecciones adquiridas en UCI o tras manipulación  instrumental o quirúrgica de la vía urinaria se debe plantear la asociación de  vancomicina o linezolid en caso de presencia de CGP en racimos, en las UCI en  que exista endemia de SARM (A-III).</FONT></P>     <P><FONT face=Verdana size=2>Tiempo de tratamiento: siete días y/o hasta  48 horas después de la defervescencia de los síntomas y signos de sepsis  debiendo conllevar la negativización de los cultivos. Si tras este tiempo de  tratamiento no se aprecia mejoría se debe reevaluar al paciente  (A-III).</FONT></P>     <P>&nbsp;</P>     ]]></body>
<body><![CDATA[<P><B><FONT face=Verdana size=3>Tratamiento de las infecciones del sistema nervioso central por CGP en el paciente crítico adulto</FONT></B></P>     <P><FONT face=Verdana size=2>En este apartado consideraremos las  infecciones del sistema nerviosos central (ISCN) que incluyen las meningitis  bacterianas (MB) graves adquiridas en la comunidad, las nosocomiales, las  cerebritis, los abscesos cerebrales y las ventriculitis. Los patógenos más  frecuentemente aislados en la meningitis comunitaria son <I>S. pneumoniae</I>  (39%), <I>Neisseria meningitidis</I> (15,6%) y <I>S. aureus</I>  (6,2%)<SUP>135</SUP>. La mortalidad en las distintas series varía entre el 20 y  30%<SUP>136</SUP>. En la MB neumocócica un 10% de pacientes quedará con secuelas  neurológicas permanentes.</FONT></P>     <P><FONT face=Verdana size=2>La etiología de la MB nosocomial es  diferente a la comunitaria, ya que predominan CGP como <I>S. aureus</I>,  <I>Staphylococcus</I> coagulasa negativa, <I>Enterococcus</I> spp y en menor  porcentaje los BGN.</FONT></P>     <P><FONT face=Verdana size=2>Los abscesos cerebrales son polimicrobianos  en alrededor del 45% de los casos. Los agentes causales más frecu entes son  <I>Streptococcus</I> spp., tanto aerobios como anaerobios, y bacterias  anaerobias estrictas formando parte de infecciones polimicrobianas. En los  abscesos cerebrales postraumáticos, el microorganismo más frecuente es el <I>S.  aureus</I>. Este microorganismo (poco frecuente como causa de meningitis  comunitaria) es un patógeno frecuente en las meningitis de adquisición  nosocomial y en las ventriculitis<SUP>135,137</SUP>.</FONT></P>     <P><B><FONT face=Verdana size=2>Recomendaciones de tratamiento de  infecciones de sistema nervioso central por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>No hay ensayos aleatorizados y controlados  realizados en pacientes adultos, con altos niveles de evidencia, por lo que los  puntos clave del tratamiento son el diagnóstico precoz y tratamiento antibiótico  (empírico o guiado por tinción de Gram o detección de antígeno en LCR) y el  tratamiento coadyuvante. Las recomendaciones para el tratamiento de esta  infección se resumen en la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab08.gif" target="_blank"> tabla 8</a>, mientras que en la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab04.gif" target="_blank"> tabla 4</a> se han  especificado las dosis de los antibióticos a emplear en las infecciones del  sistema nervioso central.</FONT></P>     <P><font size="2"><I><FONT face=Verdana>Infecciones del sistema nervioso central  causadas por</FONT></I> <FONT face=Verdana> Streptococcus pneumoniae</FONT></font></P>     <P><FONT face=Verdana size=2>1. Tratamiento empírico (tinción de Gram  y/o antígeno positivo en LCR). Para el tratamiento empírico de la meningitis  bacteriana de la comunidad en que se debe cubrir <I>S. pneumoniae</I>, hay un  amplio consenso de que el tratamiento de elección es la combinación de  cefotaxima y vancomicina (A-III)<SUP>138,139</SUP>. Los niveles de la  cefalosporina de tercera generación en LCR pueden ser insuficientes para el  tratamiento de infecciones causadas por cepas con CMI elevadas por lo que debe  asociarse vancomicina. No debe emplearse vancomicina en monoterapia porque las  concentraciones en LCR pueden ser infraterapéuticas. Además, en modelos animales  se ha demostrado una mayor eficacia de la combinación ceftriaxona más  vancomicina que la monoterapia con ceftriaxona, vancomicina, rifampicina o  meropenem<SUP>140,141</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En pacientes alérgicos a penicilina se  recomienda el tratamiento con vancomicina más rifampicina (B-III). Se ha  demostrado en un modelo animal, que la rifampicina incrementa la penetración en  el SNC de la vancomicina, contrarrestando el efecto negativo de la dexametasona  sobre los niveles en LCR del antibiótico<SUP>142</SUP>. Otras guías recomiendan  como alternativa moxifloxacino o gatifloxacino<SUP>138,139</SUP>, pero no  existen formulaciones intravenosas en España de estas quinolonas. No  consideramos a levofloxacino como alternativa de tratamiento debido al posible  efecto epileptógeno en pacientes con alteraciones del sistema nervioso  central<SUP>143</SUP>.</FONT></P>     <P><font face="Verdana" size="2">2. Tratamiento dirigido de infección por  <I>S. pneumoniae</I>. La pauta antibiótica dependerá de la información que  proporciona el antibiograma. Para neumococo sensibles a penicilina (CMI &#8804; 0,1 mg/l) una opción válida es penicilina G sódica (A-III). Aunque es una pauta  recomendada en las guías<SUP>138,139</SUP>, la práctica clínica habitual no es  emplear este antibiótico, sino que se prefiere una cefalosporina de tercera  generación (A-III). Si se había iniciado tratamiento empírico debe suspenderse  vancomicina y continuar con cefotaxima o ceftriaxona con los que hay una amplia  experiencia clínica positiva<SUP>135,144,145</SUP>.</font></P>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Cuando la infección está causada por un  neumococo resistente a penicilina (CMI &#8805; 1 mg/l) se debe medir la CMI a  cefalosporinas. En la tabla 8 se refleja las recomendaciones del panel según los  niveles de CMI a cefotaxima. Aunque el nivel de evidencia es bajo (A-III), es  recomendable un incremento en la dosis de cefotaxima y la adición de vancomicina  y rifampicina para tratar neumococos con los niveles más altos de resistencia  (C-III)<SUP>139,146,147</SUP>. La dosis de vancomicina deberá ajustarse para  alcanzar Cmin plasmática de 25 -30 mg/l siendo recomendable la administración en  perfusión continua<SUP>25</SUP>.</font></P>     <P><FONT face=Verdana size=2>El papel del linezolid como alternativa en  la meningitis por <I>S. pneumoniae</I> no está establecido. En un modelo animal  de meningitis, linezolid fue menos efectivo que ceftriaxona en caso de <I>S.  pneumoniae</I> sensible a penicilina, e inferior a la combinación ceftriaxona  más vancomicina si la meningitis era causada por <I>S. pneumonia</I>e resistente  a penicilina<SUP>148</SUP>. Recientemente, se ha comunicado una serie de 7  pacientes con meningitis por <I>S. pneumoniae</I> resistente a penicilina,  tratados de forma exitosa con la combinación ceftriaxona más  linezolid<SUP>149</SUP>, lo que apunta a que esta combinación de antibióticos  podría ser una alternativa en estos casos. Se requieren más estudios que  confirmen su utilidad.</FONT></P>     <P><FONT face=Verdana size=2>El meropenem es una opción que se ha  demostrado eficaz en un ensayo clínico<SUP>150</SUP>, pero en un modelo  experimental de meningitis por <I>S pneumoniae</I> resistente a penicilina,  meropenem se mostró inferior a ceftriaxona más vancomicina<SUP>151</SUP>. No  obstante, el panel cree que al ser un carbapenem de amplio espectro, no debe  emplearse en primera línea ya que existen otras opciones de espectro más  reducido. En todos los supuestos anteriores, si hay alergia a betalactámicos se  debe emplear vancomicina más rifampicina (B-III), o linezolid  (C-III).</FONT></P>     <P><FONT face=Verdana size=2>La duración del tratamiento de la  meningitis neumocócica debe ser entre 10 y 14 días.</FONT></P>     <P><font size="2"><I><FONT face=Verdana>Infecciones del sistema nervioso central  causadas por</FONT></I> <FONT face=Verdana> Staphylococcus aureus <I>y</I> coagulasa  <I>negativo</I></FONT></font></P>     <P><FONT face=Verdana size=2>En el caso de meningitis por SASM se debe  tratar con una penicilina isoxazólica (cloxacilina) y no con vancomicina en base  a su mejor penetración en el SNC y su mayor poder bactericida (A-III) (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab08.gif" target="_blank">tabla 8</a>).  Otra opción es meropenem (C-III) y para alérgicos a betalactámicos vancomicina o  linezolid (A-III).</FONT></P>     <P><FONT face=Verdana size=2>Para tratar las meningitis o ventriculitis  por SARM, el tratamiento de elección ha sido vancomicina (A-III), debiendo  considerar la adición de rifampicina por su excelente penetración en el SNC  (C-III) o el empleo de linezolid (B-III). No hay en la literatura ensayos que  hayan comparado vancomicina frente a linezolid en meningitis por SARM. Si la CMI  es menor o igual que 0,5 mg/l puede emplearse vancomicina en perfusión continua  pero manteniendo niveles séricos de 20-30 mg/l (A-III). En los pocos casos en  que la CMI se encuentre entre 1 y 4 mg/l, la primera opción puede ser el empleo  de vancomicina con rifampicina (C-III) o linezolid como alternativa, mientras  que ésta será la única opción si la CMI es mayor o igual que 8 mg/l (C-III) lo  que aún no se ha descrito en nuestro país<SUP>72,75</SUP>. Linezolid se ha  demostrado eficaz en casos comunicados de tratamiento de meningitis o  ventriculitis por SARM<SUP>152,153</SUP>, pero aún no hay evidencia para  recomendarlo como de primera línea. No se recomienda el empleo de teicoplanina  en ISNC debido a la mala difusión al LCR (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab02.gif" target="_blank">tabla 2</a>).</FONT></P>     <P><FONT face=Verdana size=2>La administración intraventricular de  vancomicina se reserva para los casos de ventriculitis asociada a drenaje con  mala evolución clínica<SUP>147</SUP> especialmente si no es posible sustituir  dicho drenaje, medida que debe realizarse siempre que se pueda<SUP>154</SUP>.  Además, este panel recomienda la adición intraventricular de vancomicina en caso  de SARM con CMI de vancomicina mayor o igual que 1 mg/l (C-III). Un estudio de  10 pacientes con ventriculitis estafilocócica asociada a drenaje demostró que 2  g/día de vancomicina no lograba niveles terapéuticos en LCR lo cual se obtenía  cuando se añadía tratamiento intraventricular con 10 mg/día de  vancomicina<SUP>155</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>El tratamiento empírico o dirigido de ISNC  por <I>S. epidermidis</I> debe ser igual al tratamiento para infecciones por  <I>S. aureus</I> resistente a meticilina, es decir, es obligado el empleo de  vancomicina (A-III) o linezolid (B-III)<SUP>156,157</SUP>. Debe considerarse la  adición de rifampicina en los casos de mala evolución clínica. Se recomienda que  la duración del tratamiento de todas las infecciones estafilocócicas sea entre 2  y 3 semanas.</FONT></P>     <P><font size="2"><I><FONT face=Verdana>Infecciones del sistema nervioso central  causadas por</FONT></I> <FONT face=Verdana> Enterococcus <I>spp.</I></FONT></font></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>La meningitis por <I>Enterococcus</I> spp.  suele ser de adquisición nosocomial en el 90% de los casos si bien puede ser  causa de meningitis comunitarias en pacientes con enfermedades debilitantes  graves<SUP>158</SUP>. En las cepas sensibles a ampicilina, el panel recomienda  el tratamiento con ampicilina y un aminoglucósido (gentamicina o estreptomicina)  (A-III)<SUP>159</SUP>. Meropenem con gentamicina es una opción válida en estos  casos (C-III)<SUP>158</SUP>. Para los aislamientos, resistentes a ampicilina, el  tratamiento de elección es vancomicina asociada a gentamicina o estreptomicina  (A-III)<SUP>138,159</SUP>. En caso de que la infección por <I>Enterococcus</I>  spp. se asocie a la existencia de un drenaje ventricular, puede emplearse además  de la terapia sistémica, vancomicina intraventricular, sobre todo en los casos  de mala evolución clínica o si dicho drenaje no puede ser sustituido. Si se  trata de una infección por <I>Enterococcus</I> spp. resistente a vancomicina, la  única opción terapéutica es linezolid (A-III) lo cual se avala por diversas  series de casos que demuestran su utilidad en esta indicación<SUP>160,161</SUP>.  La duración del tratamiento debe ser entre 2 y 3 semanas (A-III).</FONT></P>     <P>&nbsp;</P>     <P><B><FONT face=Verdana size=3>Tratamiento de la endocarditis causada por CGP en el paciente crítico</FONT></B></P>     <P><FONT face=Verdana size=2>Se define endocarditis infecciosa (EI) como  la infección que produce vegetaciones en el endocardio (válvula, defecto septal  o endocardio mural). La infección de los <I>shunts</I> arteriovenosos o de una  coartación de aorta debe denominarse endarteritis, aunque tanto el síndrome  clínico, como su manejo son similares a lo que se discute para la EI. Las EI se  clasifican en: endocarditis sobre válvula natural, EI en adictos a drogas  parenterales y endocarditis sobre válvula protésica. La información más esencial  es sin duda la etiología, por lo que las recomendaciones terapéuticas (<a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab09.gif" target="_blank">tabla 9</a>)  se basan en el conocimiento del microorganismo y su antibiograma. Las  manifestaciones clínicas de la EI pueden ser muy variables, por ello se precisa  una estrategia diagnóstica sensible y específica. En la actualidad se utilizan  los criterios de Duke que clasifican las EI en 3 categorías: definitivas,  posibles y probables<SUP>162,163</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En un hospital general de gran dimensión se  detectan unas 50 endocarditis al año, por lo que es difícil que un solo  profesional tenga suficiente experiencia personal y es muy recomendable contar,  siempre que sea posible, con la colaboración de expertos<SUP>164</SUP>. Aunque  sólo un 5% de las EI requerirán ingreso en la UCI, es esencial su reconocimiento  precoz y realizar un ecocardiograma transesofágico entre otras situaciones en  bacteriemias persistentes causadas <I>S. aureus</I>, <I>S. epidermidis</I>,  enterococo y <I>Streptococcus viridans</I> incluso cuando haya un origen  documentado<SUP>163</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En lo que respecta a la etiología de la EI,  en los últimos años se han detectado cambios importantes. El 90% de los casos  están causados por CGP, pero <I>S. viridans</I> es responsable ya de sólo un 10%  de las EI, mientras que los estafilococos causan más del 60% de los  casos<SUP>164,165</SUP>.</FONT></P>     <P><B><FONT face=Verdana size=2>Recomendaciones de tratamiento de  infecciones de endocarditis por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>La EI precisa de un tratamiento prolongado,  por ello es extremadamente importante filiarla etiológicamente. En pacientes con  hemocultivos negativos debido a que ya recibían antimicrobianos cuando aquellos  se obtuvieron, la actitud recomendada, si la situación clínica lo permite, es  suspender el tratamiento y repetir los hemocultivos a las 48-72 horas. Las dosis  de los antibióticos que se deben emplear, se reflejan en la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab04.gif" target="_blank"> tabla 4</a>.</FONT></P>     <P><FONT face=Verdana size=2>En el caso de un paciente en situación tan  crítica que no es posible esperar a conocer el resultado de los hemocultivos  puede ser necesario instaurar tratamiento empírico. El tratamiento recomendado  en caso de válvula nativa o de prótesis implantada hace más de un año será la  combinación de ampicilina (o vancomicina si hay intolerancia) con gentamicina y  ciprofloxacino durante 4-6 semanas (B-III). En caso de endocarditis sobre  válvula protésica que lleva menos de un año de implantación, el tratamiento  empírico recomendado será la combinación de vancomicina con cefepime,  rifampicina (6 semanas) y gentamicina (2 semanas)  (B-III)<SUP>163</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En la <a href="/img/revistas/medinte/v31n6/64v31n06-13108550tab09.gif" target="_blank">tabla 9</a> se han resumido algunas de  las pautas de tratamiento recomendadas en función del microorganismo aislado, su  sensibilidad antimicrobiana y si la válvula afectada es natural o protésica. Se  expresa además en ella el nivel de evidencia de la recomendación y algunas de  las citas más importantes que la refrendan. Exceptuando las EI causadas por  microorganismos más frecuentes, sobre las que se ha realizado algún ensayo  clínico, y puede hacerse recomendaciones A-I, el resto de recomendaciones, sobre  todo al referirse a patógenos con resistencias elevadas a algún antibiótico, se  basa en estudios de cohortes, en general pequeños, que no han estudiado  directamente el efecto del tratamiento, sino una descripción de la serie, por lo  que no pasan de ser recomendaciones de menor nivel.</FONT></P>     ]]></body>
<body><![CDATA[<P><FONT face=Verdana size=2>La resistencia a antimicrobianos es un  problema creciente a la hora de instaurar el tratamiento. En la actualidad hemos  de esperar que al menos el 50% de los <I>S. viridans</I> sean resistentes a  penicilina por lo que será necesario ajustar el tratamiento antibiótico a dicha  circunstancia (A-II)<SUP>166-168</SUP>. Igualmente, la resistencia a penicilina  de neumococo es un problema creciente<SUP>169</SUP>, lo que condiciona a adoptar  pautas con dosis elevadas de betalactámicos (B-III) o vancomicina con  rifampicina (C-III)<SUP>170-173</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Con respecto a <I>S. aureus</I>, cuando es  sensible a meticilina, es necesario diferenciar el tratamiento antibiótico entre  pacientes con endocarditis y adictos a drogas por vía  parenteral<SUP>174-177</SUP> de la población general con  endocarditis<SUP>178-180</SUP>. Las posibilidades de tratamiento de endocarditis  por SARM son varias<SUP>165,181-185</SUP>, como se refleja en la tabla  9.</FONT></P>     <P><FONT face=Verdana size=2>Los aminoglucósidos (básicamente  gentamicina) deberán administrarse en dosis única diaria para el tratamiento de  EI causada por <I>S. viridans</I>, pero para el tratamiento de EI por  <I>Staphylococcus</I> spp. o <I>Enterococcus</I> spp. es preferible un intervalo  más reducido (3 dosis diarias) administradas lo más próximo posible a  vancomicina o cloxacilina para potenciar el efecto  sinérgico<SUP>163</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En lo que respecta a los enterococos,  cuando sean sensibles a ampicilina y aminoglucósidos, éste será el tratamiento  de elección (A-I)<SUP>186,187</SUP> o ampicilina con ceftriaxona si hay  resistencia o riesgo de nefrotoxicidad por aminoglucósidos  (B-III)<SUP>188</SUP>. Es muy frecuente en nuestro país la resistencia a  ampicilina y la resistencia de alto nivel a aminoglucósidos, con lo que no  existirá sinergia con los betalactámicos, debiendo administrar combinaciones con  glucopéptidos (B-III) o linezolid (B-III)<SUP>189,190</SUP>. Afortunadamente la  resistencia a vancomicina es rara, aunque se han descrito brotes en  UCI<SUP>191</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Es esencial recordar que la EI puede  precisar tratamiento quirúrgico emergente o precoz, por tanto se recomienda  notificar a los cirujanos cardiovasculares el diagnóstico de cada nuevo caso,  incluso aunque no tenga aún indicación quirúrgica. Existen recomendaciones  recientes sobre las indicaciones de cirugía tanto urgente como electiva en la  endocarditis<SUP>192</SUP>. La cirugía no debe retrasarse innecesariamente, ya  que esto afectará negativamente al pronóstico del paciente.</FONT></P>     <P>&nbsp;</P>     <P><B><font face="Verdana" size="3">Infecciones de partes blandas causadas por CGP</font></B></P>     <P><FONT face=Verdana size=2>Se desconocen datos exactos sobre la  epidemiología de las infecciones de piel y partes blandas (IPB) en pacientes  críticos. Las infecciones de herida quirúrgica son frecuentes, y muchas veces no  requieren tratamiento antibiótico, pero suelen ir englobadas y co nfundidas con  infecciones más profundas que afectan a órganos y espacios<SUP>193</SUP>. Por  otro lado, las IPB graves que afectan a fascias profundas y musculatura, son  poco frecuentes y las series descritas nunca llegan a un centenar de  casos.</FONT></P>     <P><FONT face=Verdana size=2>Con respecto a la etiología, muchas de las  IPB son polimicrobianas, sobre todo aquellas postquirúrgicas abdominales, por lo  tanto, no se pueden hacer recomendaciones de tratamiento empírico dirigidas  exclusivamente a CGP<SUP>194</SUP>. Por otro lado, cualquiera de los patógenos  que produce infecciones banales o infrecuentes en pacientes críticos (pie  diabético, ulceras varicosas, etc.) puede ser agente causal de infecciones  profundas y graves (infecciones necrosantes) por lo que el conocimiento de la  etiología no presupone la extensión de la infección, que debe guiarse por  criterios clínicos y quirúrgicos, ya que la parte fundamental del tratamiento es  la revisión quirúrgica de la profundidad de la lesión, y en ningún caso puede  abordarse el tratamiento antibiótico de forma  exclusiva<SUP>194,195</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>Por las razones antedichas en estas guías,  y referido a IPB se proponen recomendaciones útiles para cuando se conoce la  etiología de microorganismos grampositivos, sin excluir que deba añadirse otros  tratamientos antibióticos que cubran otros posibles agentes. De hecho, las guías  referidas a tratamiento de estas infecciones, suelen incluir un gran número de  alternativas terapéuticas<SUP>195</SUP>.</FONT></P>     ]]></body>
<body><![CDATA[<P><B><FONT face=Verdana size=2>Recomendaciones para el tratamiento de  infecciones por partes blandas causadas por CGP</FONT></B></P>     <P><FONT face=Verdana size=2>Hay pocos ensayos clínicos que hayan  estudiado IPB en pacientes críticos, y los que hay, son heterogéneos en cuanto a  definición de población a tratar, la gravedad de la infección y la actitud  quirúrgica<SUP>51,102</SUP>. Por el contrario, existe un número considerable de  estudios aleatorizados en los que no se aporta datos sobre la gravedad de los  pacientes, y en los que se comparan distintas pautas antibióticas. En general,  no se demuestra superioridad de un antibiótico en investigación sobre otro de  utilización habitual (oxacilina, vancomicina, ceftriaxona,  piperacilina-tazobactam, etc). De estos ensayos, algunos son multicéntricos,  incluyen un número elevado de pacientes y estudian la eficacia clínica en el  tratamiento de infecciones quirúrgicas superficiales o de partes blandas, como  ertapenem<SUP>196</SUP>, quinupristina-dalfopristina<SUP>197</SUP>,  teicoplanina<SUP>198</SUP>, linezolid<SUP>199</SUP>, daptomicina<SUP>200</SUP> o  tigeciclina<SUP>33</SUP>. Otros ensayos de menor nivel de evidencia han  estudiado meropenem<SUP>201</SUP>, levofloxacino<SUP>202</SUP>, cefazolina con  probenecid<SUP>203</SUP>, telavancina<SUP>36</SUP> o  dalbavancina<SUP>35</SUP>.</FONT></P>     <P><font size="2"><I><FONT face=Verdana>Infecciones causadas por</FONT></I>  <FONT face=Verdana>  Staphylococcus aureus</FONT></font></P>     <P><FONT face=Verdana size=2>Para el tratamiento de IPB por SASM se  recomienda cloxacilina (A-I)<SUP>199,200</SUP>, siendo alternativas válidas  cefazolina o amoxicilina-clavulánico (A-II)<SUP>197</SUP>, debiendo emplear  glucopéptidos o linezolid en caso de alergia a betalactámicos.</FONT></P>     <P><FONT face=Verdana size=2>En un reciente ensayo clínico<SUP>204</SUP>  que compara el empleo de linezolid con vancomicina en infecciones de piel y  partes blandas, se demuestra la superioridad de linezolid en el tratamiento de  abscesos (pero no en celulitis o infecciones de herida quirúrgica) al tratar  infecciones por SARM. No hubo diferencias en el tratamiento de otros patógenos.  Los mismos autores habían publicado el año anterior<SUP>205</SUP> un subanálisis  de los pacientes con infecciones de herida quirúrgica. Solamente hubo  diferencias significativas en la mejor erradicación microbiológica en los  pacientes que habían recibido linezolid cuando la etiología era SARM.</FONT></P>     <P><FONT face=Verdana size=2>En otro estudio en el que se comparó  linezolid frente a teicoplanina<SUP>103</SUP> en el tratamiento de infecciones  por CGP no se encontraron diferencias en la eficacia clínica al tratar IPB,  aunque el número de pacientes con infecciones por SARM era sorprendentemente  bajo. Por otro lado, se ha constatado la necesidad de administrar dosis de  teicoplanina de 6 mg/kg/día<SUP>198</SUP> en vez de dosis menores para tratar  infecciones IPB. En vista de estos estudios, el panel recomienda el empleo de  linezolid para el tratamiento de IPB causadas por SARM (A-I), dejando como  alternativa cualquiera de los glucopéptidos (B-I).</FONT></P>     <P><font size="2"><I><FONT face=Verdana>Infecciones causadas por</FONT></I>  <FONT face=Verdana>  Enterococcus <I>spp.y</I> Streptococcus <I>spp.</I></FONT></font></P>     <P><FONT face=Verdana size=2>Tampoco hay ensayos específicos sobre el  tratamiento de IPB causadas por enterococos, por lo que las recomendaciones  deben seguir el mismo criterio que el utilizado para infecciones enterocócicas  de otras localizaciones, sean sensibles a ampicilina (A-II) o resistentes,  empleando glucopéptidos o linezolid (B-III)<SUP>98,111,206</SUP>.</FONT></P>     <P><FONT face=Verdana size=2>En el caso de las infecciones causadas  exclusivamente por <I>Streptococcus pyogenes</I> (generalmente no quirúrgicas y  de extremidades) el tratamiento de elección es penicilina y clindamicina  (A-I)<SUP>207,208</SUP>. Otras alternativas como glucopéptidos o linezolid con  clindamicina tienen menor grado de evidencia (C-III), aunque en teoría serían  opciones válidas para pacientes con alergia a betalactámicos. La adición de  clindamicina se basa en una mayor supresión de toxinas y mejor modulación de la  producción de citoquinas que los betalactámicos, habiéndose demostrado en dos  ensayos clínicos<SUP>209,210</SUP> mayor eficacia clínica de clindamicina. Se  debe combinar con penicilina por la posibilidad de resistencia a  clindamicina<SUP>211</SUP>.</FONT></P>     <P>&nbsp;</P>     ]]></body>
<body><![CDATA[<P><B><font face="Verdana" size="3">Agradecimientos</font></B></P>     <P><FONT face=Verdana size=2>El panel de expertos, quiere agradecer a  Pfizer por facilitar y patrocinar el proceso de elaboración de estas  recomendaciones. Igualmente, agradecemos al Dr. Miguel Ángel de la Cal por la  orientación en la categorización de la evidencia científica y al Dr. Jordi Rello  por la revisión crítica del manuscrito.</FONT></P>     <P><B><FONT face=Verdana size=2>Declaración de conflicto de  intereses</FONT></B></P>     <P><FONT face=Verdana size=2>Este trabajo ha sido esponsorizado por  Pfizer. Además, POA ha recibido honorarios por conferencias para Pfizer, MSD,  Wyeth y Sanofi-Aventis. JGM ha recibido una beca de Lilly y honorarios por  conferencias para Lilly, MSD, Gilead y Pfizer. SGC ha recibido honorarios por  conferencias para Pfizer, MSD y Wyeth. ORC ha recibido honorarios por  conferencias para Pfizer. MPM ha recibido honorarios por conferencias para  Pfizer, Wyeth, Sanofi- Aventis y Astra-Zeneca. RZC ha recibido una beca de  Pfizer y honorarios por conferencias para Pfizer, Wyeth, MSD y Elan. PMG ha  recibido honorarios por conferencias para Pfizer, Gilead, Sanofi-Aventis, MSD,  Wyeth y Elan. ECC no ha declarado conflicto de intereses. FAL ha recibido becas  de Astra-Zeneca y Bristol Myers y honorarios por conferencias para Pfizer, MSD,  Wyeth y Sanofi-Aventis.</FONT></P> &nbsp;     <p><b><font face="Verdana" size="3">Bibliografía</font></b></P>     <!-- ref --><P><font face="Verdana" size="2">1. Martin GS, Mannino DM, Eaton S, Moss M. The epidemiology of  sepsis in the United States from 1979 through 2000. 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<body><![CDATA[<BR>Servicio de Medicina  Intensiva. Hospital de Galdakao.    <BR>B.º  de Labeaga, s/n.    <BR>48960 Galdakao.  Vizcaya.    <BR>Correo electrónico: <A  href="mailto:pedromaria.olaecheaastigarrag@osakidetza.net">pedromaria.olaecheaastigarrag@osakidetza.net</A></font></P>       ]]></body><back>
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