<?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>S0210-56912007000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Descontaminación digestiva selectiva: ¿Por qué no aplicamos la evidencia en la práctica clínica?]]></article-title>
<article-title xml:lang="en"><![CDATA[Selective digestive decontamination: Why don’t we apply the evidence in the clinical practice?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Taylor]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[van Saene]]></surname>
<given-names><![CDATA[H.K.F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abella]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silvestri]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vucic]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peric]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of Liverpool Department of Medical Microbiology ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Reino Unido</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Universitario de Getafe Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Presidio Ospedaliero di Gorizia Unitá Operativa di Anestesia e Reanimazione ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Italia</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Sisters of Mercy University Hospital Department of Intensive Care ]]></institution>
<addr-line><![CDATA[Zagreb ]]></addr-line>
<country>Croacia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<volume>31</volume>
<numero>3</numero>
<fpage>126</fpage>
<lpage>132</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0210-56912007000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0210-56912007000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0210-56912007000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La descontaminación digestiva selectiva (DDS) es una estrategia profiláctica cuyo objetivo es reducir la incidencia de infecciones, principalmente la neumonía asociada a la ventilación mecánica, en los pacientes que requieren cuidados intensivos, previniendo o erradicando el estado de portador orofaríngeo y gastrointestinal de microorganismos potencialmente patógenos. Cincuenta y cuatro ensayos clínicos randomizados (ECR) y nueve metaanálisis han evaluado la DDS. Treinta y ocho ECR muestran una reducción significativa de las infecciones y cuatro de la mortalidad. Todos los metaanálisis muestran una reducción significativa de las infecciones y 5 de los 9 metaanálisis de la mortalidad. Se necesita tratar 5 pacientes de Unidad de Cuidados Intensivos (UCI) con DDS para prevenir una neumonía y 12 pacientes de UCI deben ser tratados para prevenir una muerte. Los datos que muestran un beneficio de la DDS sobre la mortalidad tienen un grado de evidencia 1 o un grado de recomendación A (soportada por al menos dos investigaciones de nivel 1). El objetivo de esta revisión es exponer la patogenia de las infecciones en los enfermos críticos, describir la DDS, analizar la evidencia disponible sobre su eficacia y los potenciales efectos adversos, y discutir las razones publicadas por los expertos que desaconsejan el uso de la DDS, a pesar de ser reconocida como la intervención mejor evaluada en cuidados intensivos para reducir la morbilidad y mortalidad de las infecciones.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Selective digestive decontamination (SDD) is a prophylactic strategy whose objective is to reduce the incidence of infections, mainly mechanical ventilation associated pneumonia in patients who require intensive cares, preventing or eradicating the oropharyngeal and gastrointestinal carrier state of potentially pathogenic microorganisms. Fifty-four randomized clinical trials (RCTs) and 9 meta-analysis have evaluated SDD. Thirty eight RCTs show a significant reduction of the infections and 4 of mortality. All the meta-analyses show a significant reduction of the infections and 5 out of the 9 meta-analyses report a significant reduction in mortality. Thus, 5 patients from the ICU with SDD must be treated to prevent pneumonia and 12 patients from the ICU should be treated to prevent one death. The data that show benefit of the SDD on mortality have an evidence grade 1 or recommendation grade A (supported by at least two level 1 investigations). The aim of this review is to explain the pathogeny of infections in critical patients, describe selective digestive decontamination, analyze the evidence available on it efficacy and the potential adverse effects and discuss the reasons published by the experts who advise against the use of SDD, even though it is recognized as the best intervention evaluated in intensive cares to reduce morbidity and mortality of the infections.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[descontaminación digestiva selectiva]]></kwd>
<kwd lng="es"><![CDATA[infección, motalidad]]></kwd>
<kwd lng="en"><![CDATA[selective digestive decontamination]]></kwd>
<kwd lng="en"><![CDATA[infection]]></kwd>
<kwd lng="en"><![CDATA[mortality]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <B><FONT FACE="Verdana" SIZE=2>    <P ALIGN="RIGHT">PUNTO DE VISTA</P> </B></FONT>    <P>&nbsp;</P> <B><FONT FACE="Verdana" SIZE=4>    <P><a name="top"></a>Descontaminaci&oacute;n digestiva selectiva. ¿Por qu&eacute; no aplicamos la evidencia en la pr&aacute;ctica cl&iacute;nica?</P>     <P>Selective digestive decontamination. Why don’t we apply the evidence in the clinical practice?</P> </B></FONT>    <P>&nbsp;</P>     <P>&nbsp;</P> <B><FONT FACE="Verdana" SIZE=2>    <P>N. Taylor<SUP>1</SUP>; H.K.F. van Saene<SUP>1</SUP>; A. Abella<SUP>2</SUP>; L. Silvestri<SUP>3</SUP>; M. Vucic<SUP>4</SUP>; M. Peric <SUP>4</P> </B>    <P>1</SUP>Department of Medical Microbiology. University of Liverpool. Reino Unido.    <BR> <SUP>2</SUP>Servicio de Medicina Intensiva. Hospital Universitario de Getafe. Madrid. Espa&ntilde;a.    ]]></body>
<body><![CDATA[<BR> <SUP>3</SUP>Unit&aacute; Operativa di Anestesia e Reanimazione Presidio Ospedaliero di Gorizia. Italia.    <BR> <SUP>4</SUP>Department of Intensive Care. Sisters of Mercy University Hospital. Zagreb. Croacia.</P> </FONT>    <P><a href="#back"><FONT FACE="Verdana" SIZE=2>Direcci&oacute;n para correspondencia</FONT></a></P>     <P>&nbsp;</P>     <P>&nbsp;</P>     <P><HR SIZE=0> <B><FONT FACE="Verdana" SIZE=2>    <P>RESUMEN</P> </B>    <P>La descontaminaci&oacute;n digestiva selectiva (DDS) es una estrategia profil&aacute;ctica cuyo objetivo es reducir la incidencia de infecciones, principalmente la neumon&iacute;a asociada a la ventilaci&oacute;n mec&aacute;nica, en los pacientes que requieren cuidados intensivos, previniendo o erradicando el estado de portador orofar&iacute;ngeo y gastrointestinal de microorganismos potencialmente pat&oacute;genos.    <BR> Cincuenta y cuatro ensayos cl&iacute;nicos randomizados (ECR) y nueve metaan&aacute;lisis han evaluado la DDS. Treinta y ocho ECR muestran una reducci&oacute;n significativa de las infecciones y cuatro de la mortalidad. Todos los metaan&aacute;lisis muestran una reducci&oacute;n significativa de las infecciones y 5 de los 9 metaan&aacute;lisis de la mortalidad. Se necesita tratar 5 pacientes de Unidad de Cuidados Intensivos (UCI) con DDS para prevenir una neumon&iacute;a y 12 pacientes de UCI deben ser tratados para prevenir una muerte.    <BR> Los datos que muestran un beneficio de la DDS sobre la mortalidad tienen un grado de evidencia 1 o un grado de recomendaci&oacute;n A (soportada por al menos dos investigaciones de nivel 1).    ]]></body>
<body><![CDATA[<BR> El objetivo de esta revisi&oacute;n es exponer la patogenia de las infecciones en los enfermos cr&iacute;ticos, describir la DDS, analizar la evidencia disponible sobre su eficacia y los potenciales efectos adversos, y discutir las razones publicadas por los expertos que desaconsejan el uso de la DDS, a pesar de ser reconocida como la intervenci&oacute;n mejor evaluada en cuidados intensivos para reducir la morbilidad y mortalidad de las infecciones.</P> <B>    <P>Palabras clave</B>: descontaminaci&oacute;n digestiva selectiva, infecci&oacute;n, motalidad.</P> </FONT>    <P><HR SIZE=0> <B><FONT FACE="Verdana" SIZE=2>    <P>ABSTRACT</P> </B>    <P>Selective digestive decontamination (SDD) is a prophylactic strategy whose objective is to reduce the incidence of infections, mainly mechanical ventilation associated pneumonia in patients who require intensive cares, preventing or eradicating the oropharyngeal and gastrointestinal carrier state of potentially pathogenic microorganisms.     <BR> Fifty-four randomized clinical trials (RCTs) and 9 meta-analysis have evaluated SDD. Thirty eight RCTs show a significant reduction of the infections and 4 of mortality. All the meta-analyses show a significant reduction of the infections and 5 out of the 9 meta-analyses report a significant reduction in mortality. Thus, 5 patients from the ICU with SDD must be treated to prevent pneumonia and 12 patients from the ICU should be treated to prevent one death.     <BR> The data that show benefit of the SDD on mortality have an evidence grade 1 or recommendation grade A (supported by at least two level 1 investigations).     <BR> The aim of this review is to explain the pathogeny of infections in critical patients, describe selective digestive decontamination, analyze the evidence available on it efficacy and the potential adverse effects and discuss the reasons published by the experts who advise against the use of SDD, even though it is recognized as the best intervention evaluated in intensive cares to reduce morbidity and mortality of the infections.</P> <B>    <P>Key words</B>: selective digestive decontamination, infection, mortality.</P> </FONT>    <P><HR SIZE=0>     ]]></body>
<body><![CDATA[<P>&nbsp;</P> <B><FONT FACE="Verdana">    <P>Introducci&oacute;n</P> </B></FONT><FONT FACE="Verdana" SIZE=2>    <P>La descontaminaci&oacute;n digestiva selectiva (DDS) es una estrategia profil&aacute;ctica dise&ntilde;ada para prevenir las infecciones end&oacute;genas producidas por microorganismos potencialmente pat&oacute;genos (MPP) en los pacientes que requieren cuidados intensivos, incluyendo la ventilaci&oacute;n mec&aacute;nica. El prop&oacute;sito de la DDS es prevenir o erradicar, si inicialmente estuviera presente, el estado de portador orofar&iacute;ngeo y gastrointestinal de MPP, especialmente de bacilos gramnegativos aerobios (BGNA), <I>Staphylococcus aureus</I> y hongos, dejando intacta la flora end&oacute;gena, cuya presencia parece desempe&ntilde;ar un papel importante en la resistencia a la colonizaci&oacute;n. Su objetivo principal es la reducci&oacute;n de la morbilidad y mortalidad sin que aparezca resistencia a los antimicrobianos.</P> </FONT>    <P>&nbsp;</P> <B><FONT FACE="Verdana">    <P>Infecci&oacute;n en la unidad de cuidados intensivos</P> </B></FONT><FONT FACE="Verdana" SIZE=2>    <P>La morbilidad y mortalidad asociada a la infecci&oacute;n adquirida, tanto antes como despu&eacute;s del ingreso en la Unidad de Cuidados Intensivos (UCI), es un problema mayor en medicina intensiva<SUP>1</SUP>. La clave para el control de las infecciones en UCI consiste en reconocer que s&oacute;lo un rango limitado de MPP est&aacute; involucrado en las infecciones y que &eacute;stas habitualmente siguen un patr&oacute;n end&oacute;geno predecible<SUP>2</SUP>. Los MPP se encuentran inicialmente en la orofaringe y el tracto gastrointestinal antes de que se produzca la infecci&oacute;n de &oacute;rganos internos tales como las v&iacute;as a&eacute;reas bajas o la sangre. Existen quince MPP que causan pr&aacute;cticamente todas las infecciones (</FONT><a HREF="/img/revistas/medinte/v31n3/64v31n03-13101490tab01.gif" target="_blank"><FONT FACE="Verdana" SIZE=2>tabla 1</FONT></a><FONT FACE="Verdana" SIZE=2>). Pueden clasificarse en dos grupos: «normal», habitualmente presente en pacientes previamente sanos, y «anormal», habitualmente en pacientes con patolog&iacute;a de base cr&oacute;nica o aguda. Los MPP «normales» incluyen <I>Streptococcus pneumoniae</I>, <I>Haemophilus influenzae</I>, <I>Moraxella catarrhalis</I>, <I>Escherichia coli</I>, <I>Staphylococcus aureus</I> y <I>Candida albicans</I>. En el grupo de MPP «anormales» que causan infecciones en la UCI estar&iacute;an ocho BGNA (<I>Klebsiella</I>, <I>Enterobacter</I>, <I>Citrobacter</I>, <I>Proteus</I>, <I>Morganella</I>, <I>Acinetobacter</I>, <I>Serratia</I> y <I>Pseudomonas</I> spp.) y el <I>Staphylococcus aureus</I> meticil&iacute;n resistente (SAMR). Es poco habitual que un paciente sea portador de BGNA y SAMR en la orofaringe y tracto gastrointestinal si previamente estaba sano. La gravedad de la enfermedad es el factor m&aacute;s importante en el paso de estado de portador de flora «normal» a «anormal». En general, el estado de portador de flora anormal ocurre precozmente, en la primera semana del ingreso en UCI, cuando la patolog&iacute;a del paciente es m&aacute;s grave y el grado de inmunosupresi&oacute;n es mayor.</P>     <P>La infecci&oacute;n ex&oacute;gena deber&iacute;a diferenciarse de las primarias end&oacute;genas y secundarias end&oacute;genas (</FONT><a HREF="/img/revistas/medinte/v31n3/64v31n03-13101490tab02.gif" target="_blank"><FONT FACE="Verdana" SIZE=2>tabla 2</FONT></a><FONT FACE="Verdana" SIZE=2>). La clasificaci&oacute;n de las infecciones en end&oacute;genas y ex&oacute;genas est&aacute; basada en el estado de portador del paciente en la UCI que s&oacute;lo puede conocerse mediante la toma de muestras de vigilancia de la orofaringe y recto. Las infecciones primarias end&oacute;genas est&aacute;n causadas por MPP que el enfermo porta en su aparato digestivo cuando ingresa en la UCI. Las infecciones secundarias end&oacute;genas son las causadas por MPP que el enfermo no portaba en su aparato digestivo cuando ingres&oacute; en la UCI, sino que los adquiri&oacute; en su aparato digestivo durante la estancia en la UCI. Las infecciones ex&oacute;genas son menos comunes (alrededor de 15%), pero pueden ocurrir durante el ingreso en UCI, y est&aacute;n causadas por MPP «anormales» que no estaban previamente presentes en las muestras de vigilancia de la orofaringe y recto. Por ejemplo, los pacientes con estancias prolongadas en la UCI, sobre todo aqu&eacute;llos que tienen una traqueostom&iacute;a, tienen un alto riesgo de infecci&oacute;n ex&oacute;gena de las v&iacute;as a&eacute;reas bajas. Las secreciones purulentas de las v&iacute;as a&eacute;reas bajas llevan MPP que nunca han estado presentes previamente en la flora orofar&iacute;ngea ni en la del tracto gastrointestinal, pero que han llegado hasta all&iacute; a trav&eacute;s de la traqueostom&iacute;a. Los microorganismos implicados son la mayor&iacute;a de las veces BGNA anormales como <I>Acinetobacter</I> y <I>Pseudomonas</I> spp., y SAMR.</P>     <P>Cuando se produce una infecci&oacute;n end&oacute;gena se a&iacute;slan los mismos MPP en las muestras de vigilancia y en las muestras diagn&oacute;sticas. La infecci&oacute;n m&aacute;s frecuente en la UCI (alrededor del 55%) es la infecci&oacute;n primaria end&oacute;gena causada tanto por MPP «normales» como «anormales» que est&aacute;n presentes en la flora del paciente en el momento del ingreso. La infecci&oacute;n primaria end&oacute;gena, en general, ocurre en la primera semana del ingreso en UCI. Si el paciente estaba previamente sano, por ejemplo, en el caso del paciente traumatizado o quemado, pacientes con pancreatitis e insuficiencia hep&aacute;tica aguda, generalmente el causante de la infecci&oacute;n primaria end&oacute;gena es un MPP «normal». El SAMR y los BGNA «anormales» pueden causar infecciones primarias end&oacute;genas si las defensas del paciente estaban alteradas por la presencia de una enfermedad cr&oacute;nica. Por ejemplo, un paciente con diabetes, alcoholismo o enfermedad pulmonar obstructiva cr&oacute;nica puede ser portador de MPP «anormales» en el momento del ingreso. Los pacientes con condiciones debilitantes, trasladados de otro hospital o residencias tambi&eacute;n son portadores de flora anormal frecuentemente.</P>     <P>Las infecciones secundarias end&oacute;genas son siempre causadas por BGNA «anormales» y SAMR que no est&aacute;n en la flora del paciente en el momento del ingreso. Estos microorganismos primero se adquieren en la orofaringe y luego en el est&oacute;mago e intestino, debido a la transmisi&oacute;n a trav&eacute;s de las manos del personal sanitario. En los pacientes de cuidados intensivos la adquisici&oacute;n orofar&iacute;ngea e intestinal lleva invariablemente a un estado de portador de flora anormal denominado secundario o superportador. El consiguiente sobrecrecimiento, definido como 10<SUP>5</SUP> MPP/ml de saliva y/o gramos de heces, puede ocurrir en pocos d&iacute;as y resultar en colonizaci&oacute;n y posteriormente en infecci&oacute;n secundaria end&oacute;gena. Un tercio de las infecciones en UCI son secundarias end&oacute;genas y, en general, aparecen tras la primera semana de ingreso en &eacute;sta.</P> </FONT>    <P>&nbsp;</P> <B><FONT FACE="Verdana">    ]]></body>
<body><![CDATA[<P>¿Qu&eacute; es la descontaminaci&oacute;n digestiva selectiva?</P> </B></FONT><FONT FACE="Verdana" SIZE=2>    <P>La DDS es una t&eacute;cnica profil&aacute;ctica para el control de los tres tipos de infecciones adquiridas en la UCI causadas por 15 MPP<SUP>3</SUP>. En la pr&aacute;ctica, la DDS tiene cuatro fundamentos (</FONT><a HREF="/img/revistas/medinte/v31n3/64v31n03-13101490tab03.gif" target="_blank"><FONT FACE="Verdana" SIZE=2>tabla 3</FONT></a><FONT FACE="Verdana" SIZE=2>):</P>     <BLOCKQUOTE>1. Antimicrobianos enterales.</BLOCKQUOTE>     <BLOCKQUOTE>2. Antimicrobianos intravenosos administrados los primeros d&iacute;as tras el ingreso en UCI.</BLOCKQUOTE>     <BLOCKQUOTE>3. Medidas higi&eacute;nicas para prevenir la colonizaci&oacute;n cruzada entre enfermos o del medio ambiente al enfermo, por ejemplo, lavado de manos, uso de guantes, limpieza de las UCI, etc.</BLOCKQUOTE>     <BLOCKQUOTE>4. Toma de muestras de vigilancia en orofaringe y recto.</BLOCKQUOTE>     <P>Esta estrategia tiene como objetivo erradicar de forma selectiva los 15 MPP que contribuyen a la morbilidad y mortalidad. Por dise&ntilde;o la DDS no afecta a los microorganismos con poca patogenicidad como los anaerobios, estreptococos viridans, enterococos y estafilococos coagulasa negativos que, en general, s&oacute;lo producen morbilidad. La DDS consiste en la administraci&oacute;n enteral de polimixina E y tobramicina no absorbibles para erradicar los BGNA «anormales» consiguiendo la descontaminaci&oacute;n del tracto digestivo. Se administra tambi&eacute;n anfotericina B para la erradicaci&oacute;n de hongos y, en unidades con endemia de SAMR, se a&ntilde;ade vancomicina<SUP>4,5</SUP>. La DDS es una maniobra dise&ntilde;ada para convertir a los portadores de flora «anormal» en portadores de flora «normal» utilizando antimicrobianos enterales no absorbibles. El paciente de cuidados intensivos es incapaz de eliminar los BGNA debido a su patolog&iacute;a de base. El sobrecrecimiento intestinal de los BGNA causa inmunopar&aacute;lisis. La raz&oacute;n para la administraci&oacute;n enteral de polimixina E y tobramicina se debe a que proporciona una recuperaci&oacute;n de la inmunidad sist&eacute;mica, y la prevenci&oacute;n o erradicaci&oacute;n de los BGNA «anormales» en la orofaringe y el tracto gastrointestinal controla de forma efectiva la aspiraci&oacute;n y translocaci&oacute;n de estos microorganismos a las v&iacute;as a&eacute;reas bajas y la sangre. Los antimicrobianos enterales han demostrado ser efectivos en el control de las infecciones secundarias end&oacute;genas. Sin embargo, el uso &uacute;nicamente de antibi&oacute;ticos enterales no tiene efecto sobre las infecciones primarias end&oacute;genas ni sobre las ex&oacute;genas. El segundo componente es la administraci&oacute;n, en el momento del ingreso, de un antibi&oacute;tico por v&iacute;a parenteral adecuado para el control de las neumon&iacute;as y bacteriemias primarias end&oacute;genas. La cefotaxima ha sido utilizada en varios ensayos cl&iacute;nicos con asignaci&oacute;n aleatoria (randomizados) (ECR) para erradicar tanto los MPP «normales» como «anormales». En tercer lugar, las medidas habituales de higiene son indispensables para reducir la contaminaci&oacute;n de las manos y la subsiguiente transmisi&oacute;n desde fuentes externas. Finalmente, el protocolo de DDS incluye la toma de muestras de vigilancia de orofaringe y recto, impopulares entre los microbi&oacute;logos tradicionales, en el momento del ingreso y dos veces por semana. El conocimiento del estado de portador permite monitorizar la eficacia de este protocolo profil&aacute;ctico.</P>     <P>La DDS est&aacute; dise&ntilde;ada para reducir las infecciones end&oacute;genas mediante la prevenci&oacute;n del estado de portador de MPP. Sin embargo, al reducirse la frecuencia de estado de portador se disminuye la presi&oacute;n de colonizaci&oacute;n y, por tanto, tambi&eacute;n se minimiza la probabilidad de infecci&oacute;n ex&oacute;gena por transmisi&oacute;n cruzada de paciente a paciente a trav&eacute;s de las manos del personal sanitario.</P> </FONT>    <P>&nbsp;</P> <B><FONT FACE="Verdana">    <P>¿Cu&aacute;l es la evidencia?</P> </B></FONT><FONT FACE="Verdana" SIZE=2>    ]]></body>
<body><![CDATA[<P>Cincuenta y cuatro ECR<SUP>6-59</SUP> fueron dise&ntilde;ados para evaluar la DDS en un total de 8.715 pacientes entre el a&ntilde;o 1987 y 2005, y existen nueve metaan&aacute;lisis de los ECR que eval&uacute;an la DDS<SUP>60-68</SUP>. Treinta y ocho ECR muestran una reducci&oacute;n significativa de las infecciones y cuatro de la mortalidad. Todos los metaan&aacute;lisis muestran una reducci&oacute;n significativa de las infecciones y 5 de los 9 metaan&aacute;lisis refieren una reducci&oacute;n significativa de la mortalidad. El metaan&aacute;lisis m&aacute;s completo incluye 36 ECR con 6.922 pacientes, y demuestra que la DDS reduce las neumon&iacute;as (odds ratio [OR] 0,35; intervalo de confianza del 95% [IC 95%] 0,29 a 0,41) y la mortalidad (OR 0,78; IC 95% 0,68 a 0,89)<SUP>66</SUP>. Se necesita tratar 5 pacientes de UCI con DDS para prevenir una neumon&iacute;a y 21 pacientes de UCI para prevenir una muerte. Dos ECR recientes reportan una reducci&oacute;n absoluta de la mortalidad de un 8%, lo que supone que es necesario tratar a 12 pacientes para salvar una vida<SUP>28,31</SUP>.</P>     <P>La DDS es un m&eacute;todo seguro en cuanto a que los datos existentes no muestran una asociaci&oacute;n entre DDS y resistencia a antibi&oacute;ticos. El &uacute;ltimo ECR tuvo como objetivo primario la evaluaci&oacute;n del desarrollo de resistencia a los antimicrobianos y report&oacute; que la DDS no conlleva resistencia de los BGNA a antibi&oacute;ticos y que, adem&aacute;s, el a&ntilde;adir polimixina E y tobramicina enterales a los antibi&oacute;ticos por v&iacute;a parenteral reduce la aparici&oacute;n de resistencia cuando se compara con el uso de antibi&oacute;ticos por v&iacute;a parenteral solamente<SUP>28</SUP>. Es m&aacute;s, en este &uacute;ltimo ECR holand&eacute;s que eval&uacute;a la DDS en aproximadamente 1.000 pacientes se observa una reducci&oacute;n significativa del n&uacute;mero de portadores de BGNA multirresistentes en el grupo de pacientes que recibieron DDS (16%) frente al grupo control (26%)<SUP>28</SUP>. Estos datos son congruentes con un ECR previo que mostr&oacute; que los antimicrobianos enterales controlaron un brote de <I>Klebsiella</I> sp. productora de beta-lactamasa<SUP>15</SUP>.</P>     <P>La DDS ha sido utilizada en dos UCI americanas con endemia de enterococo vancomicina resistente (EVR)<SUP>8,26</SUP>. El estado de portador y el n&uacute;mero de infecciones fueron bajos y similares en el grupo con DDS y el grupo control. El r&eacute;gimen cl&aacute;sico de DDS, sin vancomicina enteral, no est&aacute; dise&ntilde;ado para el control de SAMR. Existen siete ECR en UCI con endemia para SAMR en el momento del ensayo cl&iacute;nico, que refieren una tendencia a un mayor n&uacute;mero de infecciones por SAMR en los pacientes que recibieron la DDS<SUP>16,19,22,25,33,55,56</SUP>. Para el control del SAMR en UCI con endemia es preciso a&ntilde;adir vancomicina enteral a la DDS<SUP>4,5</SUP>. No ha habido emergencia de EVR en ninguno de los ECR que han usado vancomicina enteral<SUP>4,5,10,23,30,31,39,48</SUP>. La literatura reciente demuestra que es el uso de antibi&oacute;ticos que no respetan la ecolog&iacute;a intestinal del paciente, m&aacute;s que el uso de altas dosis de vancomicina enteral, lo que promueve la aparici&oacute;n de EVR en el tracto gastrointestinal<SUP>71,72</SUP>. La resistencia a antimicrobianos, una cuesti&oacute;n clave, ha sido evaluada en ocho estudios que monitorizaron la resistencia a antibi&oacute;ticos entre dos y siete a&ntilde;os<SUP>73-80</SUP>, y la asociaci&oacute;n entre resistencia bacteriana y empleo de DDS no ha sido un problema cl&iacute;nico.</P>     <P>Los datos m&aacute;s recientes que muestran un beneficio de la DDS sobre la mortalidad, sin aparici&oacute;n de resistencia a antimicrobianos en pacientes de UCI no seleccionados, tienen un nivel de evidencia I (ECR con resultados certeros y baja posibilidad de falsos positivos o falsos negativos) y un grado de recomendaci&oacute;n A (al menos dos ensayos cl&iacute;nicos con nivel de evidencia I). La </FONT><a HREF="/img/revistas/medinte/v31n3/64v31n03-13101490tab04.gif" target="_blank"><FONT FACE="Verdana" SIZE=2>tabla 4</FONT></a><FONT FACE="Verdana" SIZE=2> muestra las cinco maniobras m&eacute;dicas basadas en la evidencia que ofrecen un beneficio en la supervivencia en los pacientes de cuidados intensivos. S&oacute;lo la DDS es soportada por al menos dos investigaciones de nivel I<SUP>28,31</SUP>, mientras que las otras cuatro maniobras<SUP>81-84</SUP> son soportadas por s&oacute;lo un ensayo cl&iacute;nico, por tanto, una recomendaci&oacute;n grado B (un solo ensayo cl&iacute;nico con nivel de evidencia I). Adem&aacute;s, hay que a&ntilde;adir que la DDS puede administrarse a cualquier paciente con riesgo de infecci&oacute;n, mientras que las otras cuatro maniobras s&oacute;lo pueden utilizarse en grupos espec&iacute;ficos de pacientes de cuidados intensivos. Finalmente, la DDS reduce la resistencia a antimicrobianos de los BGNA, mientras que la ventilaci&oacute;n mec&aacute;nica con volumen tidal bajo, la prote&iacute;na C activada, el tratamiento intensivo con insulina y los corticoides no pueden tener ning&uacute;n efecto sobre este importante problema.</P> </FONT>    <P>&nbsp;</P> <B><FONT FACE="Verdana">    <P>¿Por qu&eacute; la descontaminaci&oacute;n digestiva selectiva no es ampliamente empleada?</P> </B></FONT><FONT FACE="Verdana" SIZE=2>    <P>La raz&oacute;n m&aacute;s importante por la cual la DDS no es usada de forma generalizada radica en opiniones que no se basan en la evidencia. Dos recientes encuestas sobre el uso de la DDS revelan que es utilizada de forma rutinaria s&oacute;lo en un 4% de las UCI del Reino Unido<SUP>85</SUP>, en contraposici&oacute;n a un 24% de las UCI holandesas<SUP>86</SUP>. La raz&oacute;n m&aacute;s habitualmente citada para no utilizarla (83%) es la creencia, entre los intensivistas del Reino Unido, de que existe poca o ninguna evidencia sobre su eficacia y el «no funciona»<SUP>85</SUP>. El motivo para explicar esta idea equivocada es multifactorial. Sin embargo, el amplio desacuerdo entre los expertos ha sido un factor importante en esta confusi&oacute;n<SUP>87,88</SUP>. Lo mismo ocurri&oacute; con el trabajo de Semmelweis, en el que se enfatizaba el papel del lavado de las manos en la prevenci&oacute;n de la sepsis puerperal y que fue ampliamente rechazado por Virchow, pat&oacute;logo experto en ese momento<SUP>89</SUP>. Experiencias previas con los agentes trombol&iacute;ticos muestran patrones similares con un tiempo indeseable entre la aparici&oacute;n de la evidencia y la recomendaci&oacute;n de los expertos. La estreptoquinasa hab&iacute;a mostrado una reducci&oacute;n en la mortalidad del infarto de miocardio de un 20% en el a&ntilde;o 1975. En las siguientes dos d&eacute;cadas, 14 revisiones obviaron mencionar la estreptoquinasa o la consideraron todav&iacute;a en fase experimental<SUP>90</SUP>, hasta que finalmente los agentes trombol&iacute;ticos se emplearon de manera rutinaria en el tratamiento del infarto agudo de miocardio.</P>     <P>La preocupaci&oacute;n de los expertos sobre la aparici&oacute;n de resistencia a los antimicrobianos est&aacute; basada en un bajo nivel de evidencia, pero ha impedido la implantaci&oacute;n de la DDS. Los expertos europeos y americanos exponen que la objeci&oacute;n m&aacute;s importante para el uso generalizado de la DDS es su efecto desconocido so bre la resistencia a antibi&oacute;ticos a largo plazo<SUP>91,92</SUP>. Se refieren de forma invariable a sus propios art&iacute;culos de revisi&oacute;n, el menor nivel de evidencia de todos los disponibles<SUP>88,93</SUP>. Todas las revisiones incluyen los siete ECR que fueron realizados en UCI con endemia de SAMR en el momento del ensayo, aunque s&oacute;lo existe una tendencia a un aumento de infecciones por SAMR en los pacientes que recibieron DDS<SUP>16,19,22,25,33,55,56</SUP>. Un aumento de resistencia de las bacterias grampositivas s&oacute;lo se ha visto cuando se incluyeron el estado de portador y las infecciones causadas por microorganismos de baja patogenicidad, como los enterococos y los estafilococos coagulasa negativos. Claramente, la neumon&iacute;a causada por estos microorganismos de baja patogenicidad es extremadamente rara. Igualmente, las autoridades influyentes como el <I>Center for Disease Control and Prevention</I> (CDC) no recomiendan la DDS por la preocupaci&oacute;n ante el desarrollo de resistencias a antibi&oacute;ticos<SUP>94</SUP>. Adem&aacute;s, el CDC considera a la DDS como una estrategia de alto coste (m&aacute;s de 50 euros)<SUP>95</SUP>. Estas gu&iacute;as no est&aacute;n basadas en ECR sino en la opini&oacute;n de un grupo de expertos, de nuevo el menor nivel de evidencia. Recientemente, la medicina basada en la evidencia (MBE) est&aacute; siendo utilizada por grupos americanos y canadienses para desarrollar gu&iacute;as de pr&aacute;ctica cl&iacute;nica para la prevenci&oacute;n de la neumon&iacute;a asociada a ventilaci&oacute;n mec&aacute;nica<SUP>96,97</SUP>. El grupo americano concluye que la DDS no est&aacute; recomendada porque existe amplia evidencia que sugiere que su uso puede incrementar la resistencia a antibi&oacute;ticos<SUP>98</SUP>. Para apoyar esa conclusi&oacute;n los autores citan dos revisiones de autores que han escrito de forma repetida en contra de la DDS<SUP>93,99</SUP>. Sacar conclusiones basadas en opini&oacute;n de expertos es err&oacute;neo y va en contra del prop&oacute;sito de la MBE; el mejor estimador est&aacute; basado en una revisi&oacute;n imparcial de toda la informaci&oacute;n disponible<SUP>100</SUP>. Hay dos ECR que reportan un incremento significativo de la resistencia en los microorganismos BGNA<SUP>42,55</SUP>, pero el denominador fueron muestras o infecciones y no pacientes. Las infecciones ex&oacute;genas no se controlan con la DDS. Un incremento transitorio en las infecciones ex&oacute;genas de v&iacute;as a&eacute;reas bajas por <I>Acinetobacter baumannii</I> fue referida en una unidad respiratoria con un alto porcentaje de pacientes con traqueostom&iacute;a mientras participaban en un ECR sobre DDS<SUP>24,73</SUP>. Esta observaci&oacute;n de que la proporci&oacute;n de infecciones ex&oacute;genas en los ensayos con DDS se incrementa con respecto a la reducci&oacute;n de infecciones end&oacute;genas es bien conocida. Este hallazgo transitorio es usado de forma repetida para mostrar que la DDS incrementa la resistencia antibi&oacute;tica de los BGNA<SUP>93</SUP>.</P>     <P>La DDS no est&aacute; recomendada por una comisi&oacute;n de expertos seleccionados para el <I>Canadian Critical Care Trials Group</I> y la C<I>anadian Critical Care Society</I> debido a su falta de seguridad en cuanto a aparici&oacute;n de resistencia a antimicrobianos y a su coste<SUP>97</SUP>. La comisi&oacute;n decidi&oacute; evaluar s&oacute;lo los metaan&aacute;lisis y no los ECR sobre la DDS, ninguno de los cuales proporciona una relaci&oacute;n entre DDS y resistencia a antimicrobianos. Es cierto que la relaci&oacute;n coste-efectividad de la DDS no est&aacute; adecuadamente evaluada, pero los costes no deber&iacute;an preocupar si tenemos en cuenta que una maniobra de 6 euros reduce las tasas de neumon&iacute;as un 65% y la mortalidad en un 22%, sin aparici&oacute;n de resistencia a antimicrobianos en pacientes no seleccionados de la UCI. La conclusi&oacute;n de la comisi&oacute;n canadiense no est&aacute;, una vez m&aacute;s, basada en la evidencia cient&iacute;fica mediante ECR sino en la opini&oacute;n de expertos, es decir, el menor nivel de evidencia. De esta manera, la afirmaci&oacute;n de que la resistencia a antibi&oacute;ticos es un problema con la DDS es inapropiada porque no se apoya en un an&aacute;lisis basado en la evidencia<SUP>100,101</SUP>.</P>     <P>Desde el principio, la DDS ha recibido una prensa frecuentemente desfavorable. Efectivamente, la primera <I>European Consensus Conference</I> en Par&iacute;s, Francia, en 1992<SUP>102</SUP>, fue el escenario para el inicio de la vertiente en contra del uso de la DDS. De la misma forma, aunque la DDS ha figurado de forma regular en el programa del A<I>nnual Intensive Care Meeting</I> en Bruselas, B&eacute;lgica, desde 1987, s&oacute;lo en tres ocasiones (1988, 1990, 2003) fueron invitados conferenciantes con una visi&oacute;n favorable de la DDS. Por otra parte, la pobre reputaci&oacute;n de la DDS tambi&eacute;n se debe a una mayor aceptaci&oacute;n para la publicaci&oacute;n de manuscritos que muestran resultados negativos; de los 54 ECR sobre la DDS, los seis que no muestran beneficio fueron publicados en revistas de alto impacto<SUP>19,22,25,33,55,56</SUP>. Un ejemplo extremo es la publicaci&oacute;n en el <I>New England Journal of Medicine</I> de un estudio no controlado donde el 10% de la poblaci&oacute;n estudiada desarroll&oacute; neumon&iacute;a por enterococo<SUP>103</SUP>. Debe cuestionarse si hay que tomar en consideraci&oacute;n una incidencia tan alta de neumon&iacute;a causada por un microorganismo de baja patogenicidad que raramente causa neumon&iacute;a.</P>     ]]></body>
<body><![CDATA[<P>La DDS no ha sido tampoco promocionada por la empresa farmac&eacute;utica, posiblemente porque no se obtienen excesivos beneficios con el uso de agentes como la cefotaxima, polimixina E, tobramicina y anfotericina B, que son baratos y sin patentes. Adem&aacute;s, la DDS no tiene una presentaci&oacute;n oficial y no est&aacute; comercializada de la manera cl&aacute;sica para el cl&iacute;nico. Por tanto, la aplicaci&oacute;n de la DDS supone un mayor esfuerzo en t&eacute;rminos de compromiso y monitorizaci&oacute;n por el equipo de la UCI que la simple administraci&oacute;n del &uacute;ltimo antibi&oacute;tico que ha salido en el mercado. El ejemplo m&aacute;s reciente es la <I>Surviving Sepsis Campaign</I> patrocinada por la industria, que recomienda todas las intervenciones basadas en la evidencia que reducen la mortalidad, excepto la DDS. &Eacute;sta, con un coste de 6 euros, es a d&iacute;a de hoy considerada por el CDC<SUP>95</SUP> y los expertos de la comisi&oacute;n canadiense<SUP>97</SUP> como una estrategia cara, mientras que los expertos de la <I>Surviving Sepsis Campaign</I> no tienen problemas en recomendar la prote&iacute;na C activada con un coste de 7.000 euros por paciente<SUP>104</SUP>.</P> </FONT>    <P>&nbsp;</P> <B><FONT FACE="Verdana">    <P>El futuro</P> </B></FONT><FONT FACE="Verdana" SIZE=2>    <P>A pesar de la poderosa corriente anti-DDS, &eacute;sta es actualmente un protocolo de MBE. Las sociedades e instituciones europeas<SUP>105</SUP>, Gran Breta&ntilde;a<SUP>106</SUP> y Estados Unidos<SUP>107</SUP> reconocen que la DDS es la intervenci&oacute;n mejor evaluada en cuidados intensivos para reducir la morbilidad y mortalidad. La <I>Agency for Healthcare Research and Quality of the US Department for Health and Human Services</I> considera a la DDS como una maniobra barata<SUP>107</SUP>.</P>     <P>A lo mejor el aspecto m&aacute;s fascinante de los 18 a&ntilde;os de investigaci&oacute;n cl&iacute;nica con la DDS es la experiencia acerca de que la adici&oacute;n de antibi&oacute;ticos enterales a los parenterales puede prolongar la era antibi&oacute;tica. Los antibi&oacute;ticos de antes de los ochenta siguen siendo activos siempre y cuando se les combine con la erradicaci&oacute;n de los bacilos gramnegativos y SAMR del tracto intestinal. Es poco probable que el uso de la DDS exacerbe el problema de microorganismos resistentes y puede ser en parte la soluci&oacute;n por dos motivos. Primero, la DDS se basa en el concepto de que al portador de flora «anormal» se le deben tomar muestras de vigilancia de la flora del tracto gastrointestinal. Las UCI que utilizan la DDS tienen un mejor conocimiento de las resistencias a antimicrobianos que aquellas unidades que dependen de las muestras diagn&oacute;sticas (aspirado traqueal y sangre). En segundo lugar, las resistencias surgen del gran n&uacute;mero de bacterias del tracto gastrointestinal. Peque&ntilde;as cantidades de antibi&oacute;ticos por v&iacute;a parenteral, que se eliminan por intestino, seleccionan las bacterias resistentes. La eliminaci&oacute;n del sobrecrecimiento bacteriano del tracto intestinal reduce la probabilidad de resistencia. Creemos que la respuesta no est&aacute; en el desarrollo de antibi&oacute;ticos sist&eacute;micos nuevos, potentes y caros, sino en un cambio radical en la forma de plantearse el porqu&eacute; y para qu&eacute; se utilizan los antibi&oacute;ticos. En particular, necesitamos ser m&aacute;s cr&iacute;ticos sobre nuestra actividad asistencial si queremos encontrar soluciones sostenibles a la actual proliferaci&oacute;n de pat&oacute;genos nosocomiales resistentes a antibi&oacute;ticos en este nuevo milenio.</P> <B>    <P>Declaraci&oacute;n de conflicto de intereses</P> </B>    <P>Los autores han declarado no tener ning&uacute;n conflicto de intereses.</P> </FONT>    <P>&nbsp;</P> <B><FONT FACE="Verdana">    <P>Bibliograf&iacute;a</P> </B></FONT><FONT FACE="Verdana" SIZE=2>    <!-- ref --><P>1. Angus DC, Linde-Zwirble WT, Lidicker J, et al. Epidemiology of severe sepsis in the United States: analysis of incidence, outcome and associated costs of care. 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<body><![CDATA[<BR> Servicio de Medicina Intensiva.    <BR> Hospital Universitario de Getafe.    <BR> Ctra. de Toledo, km 12,5.    <BR> 28905 Getafe. Madrid. Espa&ntilde;a.    <BR> Correo electr&oacute;nico: </FONT><A HREF="mailto:a.pucela@tiscali.es"><FONT FACE="Verdana" SIZE=2>a.pucela@tiscali.es</FONT></A></P> <FONT FACE="Verdana" SIZE=2>    <P>Manuscrito aceptado el 19-VI-2006.</P></FONT>     ]]></body><back>
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