<?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>0121-0319</journal-id>
<journal-title><![CDATA[Medicas UIS]]></journal-title>
<abbrev-journal-title><![CDATA[Medicas UIS]]></abbrev-journal-title>
<issn>0121-0319</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-03192016000200011</article-id>
<article-id pub-id-type="doi">10.18273/revmed.v29n2-2016010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Acinetobacter baumannii: patógeno multirresistente emergente]]></article-title>
<article-title xml:lang="en"><![CDATA[Acinetobacter baumannii: emerging multidrug-resistant pathogen]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodriguez Buenahora]]></surname>
<given-names><![CDATA[Ruben Dario]]></given-names>
</name>
<xref ref-type="aff" rid="AFF"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bustillo Zarate]]></surname>
<given-names><![CDATA[Daniel Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="AFF"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caicedo Sanchez]]></surname>
<given-names><![CDATA[Diana Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="AFF"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cadena Sarmiento]]></surname>
<given-names><![CDATA[Diana Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="AFF"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castellanos Gomez]]></surname>
<given-names><![CDATA[Cristhyam]]></given-names>
</name>
<xref ref-type="aff" rid="AFF"/>
</contrib>
</contrib-group>
<aff id="AF1">
<institution><![CDATA[,Clínica la Merced unidad de cuidados intensivos ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="AF2">
<institution><![CDATA[,Centro de atención de Urgencias y especialistas avenida 68 Urgencias ]]></institution>
<addr-line><![CDATA[Bogotá Cundinamarca]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="AF3">
<institution><![CDATA[,Clínica la Merced unidad de cuidados intensivos ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="AF4">
<institution><![CDATA[,Clínica la Merced unidad de cuidados intensivos ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="AF5">
<institution><![CDATA[,Clínica la Merced unidad de cuidados intensivos ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>113</fpage>
<lpage>135</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-03192016000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-03192016000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-03192016000200011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introduccion: Acinetobacter baumannii es un bacilo Gram negativo oportunista, clasificado por la Sociedad Americana de Enfermedades Infecciosas como uno de los seis más importantes microorganismos multirresistentes alrededor del mundo. En Colombia, según informes del Ministerio de Salud y Protección Social, dentro de los microorganismos multirresistente aislados en unidades de cuidados intensivos del país en el año 2014, A. baumannii representó el 3,1&#37;. Objetivo: revisar los aspectos relevantes en la epidemiología, hábitat natural, factores de riesgo y virulencia para la infección por A. baumannii, sus manifestaciones clínicas y diferentes mecanismos de resistencia frente a múltiples fármacos, las estrategias de manejo actual y en desarrollo para enfrentar este microorganismo y mecanismos encaminados a prevenir y controlar la aparicion del mismo. Metodologia de búsqueda: se realizó una búsqueda en las bases de datos LILACS, PubMed, SciELO, Imbiomed, Cochrane, Clinicalkey, Biblioteca Virtual en Salud, de 890 articulos se seleccionaron 254. Resultados: las especies de Acinetobacter pueden ser aisladas de objetos animados e inanimados. Crecen en casi todas las muestras de suelos y agua fresca. En el medio hospitalario, estos microorganismos han sido aislados de humidificadores, equipos de ventilación, hojas de laringoscopio, cortinas, piel del personal de salud, colchones, cojines y otros equipos. Sus factores de virulencia no han sido dilucidados en totalidad, entre ellos se encuentran proteína de membrana externa OmpaA, lipopolisacáridos y polisacáridos capsulares, vesículas de membrana externa, fosfolipasa C y D y alteración de las proteínas de unión de penicilina. Las manifestaciones clínicas son variadas, principalmente en entorno asociado a cuidado de la salud. Sus mecanismo de resistencia son múltiples, los cuales se agrupan en tres categorías: enzimas inactivadoras de antimicrobianos, limitación del acceso a las dianas bacterianas y mutaciones que alteran las dianas o funciones celulares. Los carbapenémicos aún son considerados como agentes de elección para las infecciones graves por A. Baumannii, con opciones terapeuticas adicionales como sulbactam, tobramicina, amikacina, tigeciclina, minociclina, doxiciclina y colistina. Investigadores han reportado interrupción de la transmisión de A. baumannii posterior al reforzamiento de medidas para prevención y control de infecciones, tales como higiene de manos, uso de métodos de barrera (tapabocas, guantes, entre otros) y exhaustiva limpieza y desinfección del ambiente hospitalario. En otros casos la transmisión es más difícil de interrumpir, requiriendo aislamiento de pacientes, asignación de personal asistencial para vigilancia, cultivos de vigilancia activa y cierre de las unidades. Conclusiones: consideramos primordial el manejo de los pacientes de acuerdo a la localización de la infección y el patrón de resistencia presente en las cepas de la unidad en particular. Es importante la creación de protocolos institucionales con escalones terapéuticos, considerando el sitio de la infección, gravedad del paciente, sensibilidad de la cepa propia de cada institución y el uso previo de antibióticos. MÉD.UIS. 2016;29(2):113-35.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: Acinetobacter baumannii is an opportunistic gram-negative bacillus, classified by the American Society of Infectious Diseases as one of the six major multiresistant microorganisms worldwide. In Colombia, according to reports from the Ministry of Health and Social Protection, within the MDR microorganisms isolated in intensive care units in the country in 2014, A. baumannii accounted for 3.1&#37;. Objective: to review the relevant aspects of the epidemiology, natural habitat and virulence risk factors for infection by A. baumannii, its clinical manifestations and different mechanisms of multidrug resistance, current management strategies and developing to address this microorganism and mechanisms to prevent and control the appearance of it. Methodology: search in the LILACS, PubMed, SciELO, Imbiomed, Cochrane, ClinicalKey, Virtual Health Library of 890 data items were selected 254. Results: Acinetobacter species can be isolated from animate and inanimate objects. They grow in almost any soil samples and fresh water. In the hospital environment, these microorganisms have been isolated from humidifiers, ventilation equipment, laryngoscope blades, curtains, skin health personnel, mattresses, cushions and other equipment. Virulence factors have not been elucidated at all, including OmpaA outer membrane protein, lipopolysaccharides and capsular polysaccharides, outer membrane vesicles, phospholipase C and D and alteration of penicillin binding proteins are. The clinical manifestations are varied, mainly in environment associated with health care. Its mechanism of resistance are many, which are grouped into three categories: antimicrobial-inactivating enzymes, limiting access to bacterial and mutations that alter cell functions targets or targets. Carbapenems are still regarded as agents of choice for serious infections by A. baumannii, with additional therapeutic options such as sulbactam, tobramycin, amikacin, tigecycline, minocycline, doxycycline and colistin. Researchers have reported outage of A. Baumannii after the strengthening of measures for prevention and control of infections, such as hand hygiene, use of barrier methods (masks, gloves, etc.) and thorough cleaning and disinfection of the hospital environment. In other cases the transfer is more difficult to terminate, requiring isolation of patients, caregivers allocation for surveillance, active surveillance cultures and closing units. Conclusions: in the primary treatment of patients according to the location of the infection and the resistance pattern present in the strains of the particular unit. It is important to create institutional protocols for therapeutic steps, considering the site of infection, severity of the patient&#39;s own strain sensitivity of each institution and previous use of antibiotics. MÉD.UIS. 2016;29(2):113-35.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Acinetobacter Baumannii]]></kwd>
<kwd lng="es"><![CDATA[Bacterias Gramnegativas]]></kwd>
<kwd lng="es"><![CDATA[Epidemiologia]]></kwd>
<kwd lng="es"><![CDATA[Factores de riesgo]]></kwd>
<kwd lng="es"><![CDATA[Farmacorresistencia bacteriana]]></kwd>
<kwd lng="es"><![CDATA[Virulencia]]></kwd>
<kwd lng="en"><![CDATA[Acinetobacter baumannii]]></kwd>
<kwd lng="en"><![CDATA[Gram-negative Bacteria]]></kwd>
<kwd lng="en"><![CDATA[Epidemiology]]></kwd>
<kwd lng="en"><![CDATA[Risk factors]]></kwd>
<kwd lng="en"><![CDATA[Drug Resistance Bacterial]]></kwd>
<kwd lng="en"><![CDATA[Virulence]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="Verdana">      <p align="left"><b>DOI:</b> <a href="http://dx.doi.org/10.18273/revmed.v29n2-2016010" target="_blank">http://dx.doi.org/10.18273/revmed.v29n2-2016010</a></p>      <p align="center"><font size="4"><b><i>Acinetobacter baumannii</i>: pat&oacute;geno    <br> multirresistente emergente</b></font></p>      <p align="right"><i>Ruben Dario Rodriguez Buenahora<sup>*</sup>    <br> Daniel Enrique Bustillo Zarate<sup>**</sup>    <br> Diana Carolina Caicedo Sanchez<sup>***</sup>    <br> Diana Cristina Cadena Sarmiento<sup>****</sup>    <br> Cristhyam Castellanos Gomez <sup>*****</sup></i></p>      <br>     ]]></body>
<body><![CDATA[<p align="justify"><sup>*</sup> M&eacute;dico General. Universidad Libre. M&eacute;dico unidad de cuidados intensivos. Cl&iacute;nica la Merced. Bucaramanga. Santander. Colombia.    <br> <sup>**</sup> M&eacute;dico General. Universidad Libre. M&eacute;dico Urgencias. Centro de atenci&oacute;n de Urgencias y especialistas avenida 68. Bogot&aacute;. Cundinamarca. Colombia.    <br> <sup>***</sup> M&eacute;dico y Cirujano. Universidad Pedagogica y Tecnologica de Colombia. M&eacute;dico unidad de cuidados intensivos. Cl&iacute;nica la Merced. Bucaramanga. Santander. Colombia.    <br> <sup>****</sup> M&eacute;dico y Cirujano. Universidad Industrial de Santander. M&eacute;dico unidad de cuidados intensivos. Cl&iacute;nica la Merced. Bucaramanga. Santander. Colombia.    <br> <sup>*****</sup> M&eacute;dico General. Universidad de Santander. M&eacute;dico unidad de cuidados intensivos. Cl&iacute;nica la Merced. Bucaramanga. Santander. Colombia.</p>      <p align="justify"><b>Correspondencia:</b> Dr. Ruben Dario Rodriguez Buenahora. Direcci&oacute;n: Calle 45 No. 22-107, el poblado. Giron. Santander. Colombia. Correo electr&oacute;nico: <a href="mailto:rudar31@hotmail.com">rudar31@hotmail.com</a>    <br> Art&iacute;culo recibido el 28 de Noviembre de 2015 y aceptado para publicaci&oacute;n el 30 de Marzo de 2016.</p>  <hr>      <p align="left"><font size="3"><b>RESUMEN</b></font></p>      <p align="justify"><b>Introduccion:</b> <i>Acinetobacter baumannii</i> es un bacilo Gram negativo oportunista, clasificado por la Sociedad Americana de Enfermedades Infecciosas como uno de los seis m&aacute;s importantes microorganismos multirresistentes alrededor del mundo. En Colombia, seg&uacute;n informes del Ministerio de Salud y Protecci&oacute;n Social, dentro de los microorganismos multirresistente aislados en unidades de cuidados intensivos del pa&iacute;s en el a&ntilde;o 2014, <i>A. baumannii</i> represent&oacute; el 3,1&#37;. <b>Objetivo:</b> revisar los aspectos relevantes en la epidemiolog&iacute;a, h&aacute;bitat natural, factores de riesgo y virulencia para la infecci&oacute;n por <i>A. baumannii</i>, sus manifestaciones cl&iacute;nicas y diferentes mecanismos de resistencia frente a m&uacute;ltiples f&aacute;rmacos, las estrategias de manejo actual y en desarrollo para enfrentar este microorganismo y mecanismos encaminados a prevenir y controlar la aparicion del mismo. <b>Metodologia de b&uacute;squeda:</b> se realiz&oacute; una b&uacute;squeda en las bases de datos LILACS, PubMed, SciELO, Imbiomed, Cochrane, Clinicalkey, Biblioteca Virtual en Salud, de 890 articulos se seleccionaron 254. <b>Resultados:</b> las especies de <i>Acinetobacter</i> pueden ser aisladas de objetos animados e inanimados. Crecen en casi todas las muestras de suelos y agua fresca. En el medio hospitalario, estos microorganismos han sido aislados de humidificadores, equipos de ventilaci&oacute;n, hojas de laringoscopio, cortinas, piel del personal de salud, colchones, cojines y otros equipos. Sus factores de virulencia no han sido dilucidados en totalidad, entre ellos se encuentran prote&iacute;na de membrana externa OmpaA, lipopolisac&aacute;ridos y polisac&aacute;ridos capsulares, ves&iacute;culas de membrana externa, fosfolipasa C y D y alteraci&oacute;n de las prote&iacute;nas de uni&oacute;n de penicilina. Las manifestaciones cl&iacute;nicas son variadas, principalmente en entorno asociado a cuidado de la salud. Sus mecanismo de resistencia son m&uacute;ltiples, los cuales se agrupan en tres categor&iacute;as: enzimas inactivadoras de antimicrobianos, limitaci&oacute;n del acceso a las dianas bacterianas y mutaciones que alteran las dianas o funciones celulares. Los carbapen&eacute;micos a&uacute;n son considerados como agentes de elecci&oacute;n para las infecciones graves por <i>A. Baumannii</i>, con opciones terapeuticas adicionales como sulbactam, tobramicina, amikacina, tigeciclina, minociclina, doxiciclina y colistina. Investigadores han reportado interrupci&oacute;n de la transmisi&oacute;n de <i>A. baumannii</i> posterior al reforzamiento de medidas para prevenci&oacute;n y control de infecciones, tales como higiene de manos, uso de m&eacute;todos de barrera (tapabocas, guantes, entre otros) y exhaustiva limpieza y desinfecci&oacute;n del ambiente hospitalario. En otros casos la transmisi&oacute;n es m&aacute;s dif&iacute;cil de interrumpir, requiriendo aislamiento de pacientes, asignaci&oacute;n de personal asistencial para vigilancia, cultivos de vigilancia activa y cierre de las unidades. <b>Conclusiones:</b> consideramos primordial el manejo de los pacientes de acuerdo a la localizaci&oacute;n de la infecci&oacute;n y el patr&oacute;n de resistencia presente en las cepas de la unidad en particular. Es importante la creaci&oacute;n de protocolos institucionales con escalones terap&eacute;uticos, considerando el sitio de la infecci&oacute;n, gravedad del paciente, sensibilidad de la cepa propia de cada instituci&oacute;n y el uso previo de antibi&oacute;ticos. <b>M&Eacute;D.UIS. 2016;29(2):113-35.</b></p> 	     <p align="left"><b>Palabras clave:</b> <i>Acinetobacter Baumannii</i>. Bacterias Gramnegativas. Epidemiologia. Factores de riesgo. Farmacorresistencia bacteriana. Virulencia.</p>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b><i>Acinetobacter baumannii:</i> emerging multidrug-resistant pathogen</b></font></p>      <p align="left"><font size="3"><b>ABSTRACT</b></font></p>	      <p align="justify"><b>Introduction:</b> <i>Acinetobacter baumannii</i> is an opportunistic gram-negative bacillus, classified by the American Society of Infectious Diseases as one of the six major multiresistant microorganisms worldwide. In Colombia, according to reports from the Ministry of Health and Social Protection, within the MDR microorganisms isolated in intensive care units in the country in 2014, <i>A. baumannii</i> accounted for 3.1&#37;. <b>Objective:</b> to review the relevant aspects of the epidemiology, natural habitat and virulence risk factors for infection by <i>A. baumannii</i>, its clinical manifestations and different mechanisms of multidrug resistance, current management strategies and developing to address this microorganism and mechanisms to prevent and control the appearance of it. <b>Methodology:</b> search in the LILACS, PubMed, SciELO, Imbiomed, Cochrane, ClinicalKey, Virtual Health Library of 890 data items were selected 254. <b>Results:</b> <i>Acinetobacter species</i> can be isolated from animate and inanimate objects. They grow in almost any soil samples and fresh water. In the hospital environment, these microorganisms have been isolated from humidifiers, ventilation equipment, laryngoscope blades, curtains, skin health personnel, mattresses, cushions and other equipment. Virulence factors have not been elucidated at all, including OmpaA outer membrane protein, lipopolysaccharides and capsular polysaccharides, outer membrane vesicles, phospholipase C and D and alteration of penicillin binding proteins are. The clinical manifestations are varied, mainly in environment associated with health care. Its mechanism of resistance are many, which are grouped into three categories: antimicrobial-inactivating enzymes, limiting access to bacterial and mutations that alter cell functions targets or targets. Carbapenems are still regarded as agents of choice for serious infections by <i>A. baumannii</i>, with additional therapeutic options such as sulbactam, tobramycin, amikacin, tigecycline, minocycline, doxycycline and colistin. Researchers have reported outage of <i>A. Baumannii</i> after the strengthening of measures for prevention and control of infections, such as hand hygiene, use of barrier methods (masks, gloves, etc.) and thorough cleaning and disinfection of the hospital environment. In other cases the transfer is more difficult to terminate, requiring isolation of patients, caregivers allocation for surveillance, active surveillance cultures and closing units. <b>Conclusions:</b> in the primary treatment of patients according to the location of the infection and the resistance pattern present in the strains of the particular unit. It is important to create institutional protocols for therapeutic steps, considering the site of infection, severity of the patient&#39;s own strain sensitivity of each institution and previous use of antibiotics. <b>M&Eacute;D.UIS. 2016;29(2):113-35.</b></p> 	     <p align="left"><b>KEYWORDS:</b> <i>Acinetobacter baumannii</i>. Gram-negative Bacteria. Epidemiology. Risk factors. Drug Resistance Bacterial. Virulence.</p>  <hr>      <p align="right"><b>&iquest;C&oacute;mo citar este art&iacute;culo?:</b> Rodr&iacute;guez RD, Bustillo DE, Caicedo DC, Cadena DC, Castellanos C. <i>Acinetobacter baumannii:</i> pat&oacute;geno multirresistente emergente. M&Eacute;D.UIS. 2016;29(2):113-35.</p>  <hr>      <p align="center"><font size="3"><b><u>INTRODUCCI&Oacute;N</u></b></font></p>      <p align="justify">La resistencia a los antimicrobianos en bacilos gram negativos es un reto diario en el entorno hospitalario. De hecho, son responsables del 45&#37; al 70&#37; de la neumon&iacute;a asociada a ventilaci&oacute;n mec&aacute;nica<sup>1</sup>, el 20&#37; al 30&#37; de las infecciones del torrente sangu&iacute;neo relacionadas con el cat&eacute;ter, y com&uacute;nmente causa de sepsis adquirida en sitio de herida quir&uacute;rgica o infecci&oacute;n de v&iacute;as urinarias<sup>2</sup>. En estas situaciones, la temprana administraci&oacute;n de un adecuado cubrimiento antibi&oacute;tico es crucial para la evoluci&oacute;n del paciente, principalmente cuando los criterios de sepsis severa est&aacute;n presentes<sup>3</sup>.</p>      <p align="justify">Tasas de resistencia alarmantes han sido reportadas alrededor del mundo, restringida casi exclusivamente al entorno hospitalario hasta comienzo del presente siglo, este problema se ha registrado en forma creciente en pacientes en ambientes asociados al cuidado de la salud<sup>4,5</sup>, e incluso infecciones adquiridas en la comunidad<sup>6</sup>. Las bacterias de la familia Enterobactereaceas y los bacilos Gram negativos no fermentadores, <i>Pseudomona spp., Acinetobacter baumannii y Stenotrophomonas malthopilia</i>, representan la mayor parte del problema<sup>7</sup>. Esta resistencia puede ser el resultado de la s&iacute;ntesis de enzimas inactivadoras del antibi&oacute;tico o debido a mecanismos no enzim&aacute;ticos<sup>8</sup>. Ambos pueden ser expresados intr&iacute;nsecamente por una determinada especie (cromos&oacute;mico) o adquirido de un subconjunto de cepas especiales (selecci&oacute;n clonal) que los desarrolla como consecuencia de mutaciones de genes cromos&oacute;micos que conllevan a un aumento de la expresi&oacute;n de mecanismos de resistencia intr&iacute;nsecos, por ejemplo enzimas inactivadoras del antibi&oacute;tico, bombas de flujo, entre otros; o por transferencia horizontal de elementos gen&eacute;ticos m&oacute;viles que transportan los genes de resistencia, principalmente pl&aacute;smidos, que puede conferir un fenotipo de resistencia a m&uacute;ltiples f&aacute;rmacos<sup>8</sup>.</p>      <p align="justify"><i>A. baumannii</i> es un bacilo Gram negativo oportunista, responsable del 2&#37; al 10&#37; de las infecciones hospitalarias causadas por bacterias Gram negativas<sup>9</sup>. Es clasificado por la Sociedad Americana de Enfermedades Infecciosas como uno de los seis m&aacute;s importantes microorganismos multirresistentes alrededor del mundo<sup>10</sup>. El g&eacute;nero Acinetobacter ha sufrido muchos cambios taxon&oacute;micos en los &uacute;ltimos a&ntilde;os, y la especie <i>A. baumannii</i> no fue designada formalmente hasta el a&ntilde;o 1986<sup>11</sup>. La infecci&oacute;n por esta bacteria tiene una alta incidencia entre individuos inmunocomprometidos, particularmente con estancia hospitalaria prolongada, igual o mayor a 90 d&iacute;as<sup>12</sup>. Sobreviven en ambientes acu&aacute;ticos<sup>13</sup>, colonizan la piel y han sido aisladas de secreciones bronquiales y orofar&iacute;ngeas en individuos infectados<sup>14</sup>.</p>      <p align="justify">La Organizaci&oacute;n Mundial de la Salud ha designado recientemente la resistencia a los antimicrobianos como una de los tres problemas m&aacute;s importantes que enfrenta la salud humana<sup>15</sup>. Los m&aacute;s importantes pat&oacute;genos multirresistentes han sido agrupados en el acr&oacute;nimo ESKAPE, encontrando el <i>Enterococcus faecium, Staphylococus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomona aeruginosa</i> y <i>Enterobacter sp</i>.<sup>16</sup>. En este art&iacute;culo se tiene como objetivo revisar los aspectos relevantes en la epidemiologia, h&aacute;bitat natural, factores de riesgo y virulencia para la infecci&oacute;n por <i>A. baumannii</i>, sus manifestaciones cl&iacute;nicas y diferentes mecanismos de resistencia frente a m&uacute;ltiples f&aacute;rmacos, las estrategias de manejo actual y el desarrollo para enfrentar este microorganismo y mecanismos encaminados a prevenir y controlar la aparicion del mismo.</p>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b><u>METODOLOG&Iacute;A DE B&Uacute;SQUEDA</u></b></font></p>      <p align="justify">Se realiz&oacute; una b&uacute;squeda en las bases de datos de LILACS, PubMed, SciELO, Imbiomed, Cochrane, Clinicalkey, Biblioteca Virtual en Salud (BVS). Se utiliz&oacute; como palabras clave <i>Acinetobacter baumannii</i>, epidemiolog&iacute;a, factores de riesgo, h&aacute;bitat, farmacorresistencia bacteriana, virulencia, quinolonas, polimixina, colistina, carbapen&eacute;micos, &#946;-l&aacute;ctamicos, tetraciclina, aminoglic&oacute;sidos. Se decidi&oacute; usar estas palabras teniendo en cuenta los objetivos del art&iacute;culo; se eligieron art&iacute;culos publicados entre los a&ntilde;os 2000-2015, se seleccionaron art&iacute;culos publicados en ingl&eacute;s y espa&ntilde;ol o traducidos a estos idiomas publicados en revistas indexadas a estas bases de datos. Se seleccionaron art&iacute;culos de trabajos originales, revisiones de tema, metan&aacute;lisis, estudios observacionales de magnitud suficiente, preferentemente multic&eacute;ntricos y estudios controlados aleatorizados. Se evaluaron manualmente los art&iacute;culos, se excluyeron estudios realizados fuera del intervalo de tiempo mencionado, a excepci&oacute;n de art&iacute;culos de referencia para definiciones, clasificaciones y soporte hist&oacute;rico. Se cont&oacute; con 890 referencias en total, seleccionando s&oacute;lo los art&iacute;culos que se encuentran referenciados en este trabajo teniendo en cuenta el objetivo de la publicaci&oacute;n, el tipo de art&iacute;culo, el impacto que estos generaron y el aporte para enriquecer este trabajo (Ver <a href="#f01">Figura 1</a>).</p>      <p align="center"><a name="f01"></a><img src="img/revistas/muis/v29n2/v29n2a11f1.jpg"></p>      <p align="center"><font size="3"><b><u>RESULTADOS</u></b></font></p>      <p align="justify"><b>CLASIFICACI&Oacute;N TAXON&Oacute;MICA DE <i>A. BAUMANNII</i></b>    <br>    <br> El microbi&oacute;logo holand&eacute;s Beijerinck fue el primero en describir este microorganismo que denomin&oacute; <i>Micrococcus calcoaceticus</i>, el cual aisl&oacute; del suelo<sup>17</sup>. La designaci&oacute;n del g&eacute;nero actual, Acinetobacter (del griego &quot;akinetos&quot;, es decir, no m&oacute;viles), fue propuesto inicialmente por Brisou y Prevot<sup>18</sup> en 1954 para diferenciar los microorganismos m&oacute;viles de los inm&oacute;viles dentro del g&eacute;nero Achromobacter, el reconocimiento oficial del g&eacute;nero Acinetobacter fue dado en 1971 por el Subcomit&eacute; de Taxonom&iacute;a de Moraxella y bacterias afines en 1971<sup>19</sup>.</p>      <p align="justify">El g&eacute;nero <i>Acinetobacter</i> actualmente comprende cocobacilos Gram negativos, estrictamente aer&oacute;bicos, no fermentadores, inm&oacute;viles, no esporulados, catalasa positivos, oxidasa negativos, con un contenido de ADN G + C de 39&#37; a 47&#37;20. Con los estudios de hibridaci&oacute;n ADN-ADN realizados por Bouvet y Grimnot<sup>11</sup> en 1986 se referenciaron 12 especies, el g&eacute;nero ahora consta de 26 especies nombradas y nueve especies gen&oacute;micas<sup>21</sup>. Cuatro especies de <i>Acinetobacter, A. calcoaceticus, A. baumannii, Acinetobacter especie gen&oacute;mica 3 o A. pitii y Acinetobacter especie gen&oacute;mica 13TU o A. nosocomialis</i>, tienen fenotipo similar que los hace dif&iacute;cil de diferenciar, denomin&aacute;ndose frecuentemente como complejo <i>A. baumannii-calcoaceticus</i><sup>22</sup>. Esta designaci&oacute;n puede ser enga&ntilde;osa ya que la especie <i>A. calcoaceticus</i> no ha sido implicada en enfermedad cl&iacute;nica, mientras las otras tres especies del complejo son quiz&aacute;s las especies cl&iacute;nicamente m&aacute;s significativas en infecci&oacute;n adquirida en la comunidad y nosocomial; la especie <i>A. calcoaceticus</i> es la que ha dado nombre al complejo, siendo a su vez benigna, por lo cual no es apropiado el uso de esta denominaci&oacute;n en el contexto clinico<sup>21</sup>.</p>      <p align="justify">Los organismos pertenecientes a este g&eacute;nero son a menudo dif&iacute;cil de decolorar, identific&aacute;ndose a menudo como gram positivos. Crecen bien en medios s&oacute;lidos que son usados en forma rutinaria en laboratorios de microbiolog&iacute;a cl&iacute;nica, tales como agar sangre de carnero o agar de soja tr&iacute;ptico. Forman suaves, a veces mucoides, colonias de color blanco gris&aacute;ceo; las colonias del complejo <i>A. baumannii-calcoaceticus</i> se asemejan a las de las Enterobacterias, con un di&aacute;metro de colonia de 1.5 a 3 mm, mientras la mayor&iacute;a de las otras especies de <i>Acinetobacter</i> producen colonias m&aacute;s peque&ntilde;as y transl&uacute;cidas<sup>21</sup>.</p>      <p align="justify">No existe una prueba metab&oacute;lica definitiva que permita distinguir Acinetobacter de otras bacterias Gram-negativas no fermentadores. Un m&eacute;todo que se utiliza a menudo para identificarla a nivel de g&eacute;nero se basa en la capacidad de la cepa mutante <i>A. baylyi BD413 trpE27</i> de ser transformado por cualquier especie de <i>Acinetobacter</i> de un fenotipo tipo ADN crudo a ADN salvaje, es decir, el ensayo de transformaci&oacute;n de Juni17. Mientras que para la identificaci&oacute;n a nivel de especie, las 28 pruebas fenot&iacute;picas disponibles han demostrado ser 95,6&#37; efectivas en la identificaci&oacute;n de Acinetobacter derivados de la piel humana. Sin embargo, las pruebas fenot&iacute;picas solo han demostrado ser ineficaces en la identificaci&oacute;n de las cepas gen&oacute;micas de <i>Acinetobacter</i> descubiertas m&aacute;s recientemente<sup>23</sup>. M&eacute;todos de diagn&oacute;stico moleculares m&aacute;s avanzadas han sido desarrollados para la identificaci&oacute;n de <i>Acinetobacter</i> a nivel de especies, &eacute;stas incluyen: an&aacute;lisis amplificado del gen de restriccion 16S ARNr<sup>24</sup>, an&aacute;lisis de alta resoluci&oacute;n de huellas digitales por polimorfismo de la longitud de los fragmentos amplificados <sup>25</sup>, ribotipificaci&oacute;n<sup>26</sup>, espaciador huellas digitales ARNt27, an&aacute;lisis de restricci&oacute;n de la secuencia del espaciador intergenico 16S-23S ARNr<sup>28</sup>, an&aacute;lisis de secuencia de la regi&oacute;n espaciadora del gen 16S-23S ARNr<sup>29</sup> y secuenciaci&oacute;n del gen rpoB (ARN polimerasa subunidad &#946;)<sup>30</sup>.</p>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b><u>EPIDEMIOLOG&Iacute;A</u></b></font></p>      <p align="justify">En los Estados Unidos, se reporta que entre las infecciones asociadas al cuidado de la salud causadas por <i>A. baumannii</i>, las del torrente sangu&iacute;neo y la neumon&iacute;a asociada a ventilador mec&aacute;nico son la m&aacute;s prevalentes con el 2&#37; y 6&#37;, respectivamente<sup>31</sup>, en Europa, se reporta como el noveno pat&oacute;geno m&aacute;s com&uacute;n en infecciones hospitalarias del torrente sangu&iacute;neo<sup>32</sup> y en Latinoam&eacute;rica alcanza el 5,3&#37; de todos los aislados de bacteriemias nosocomiales<sup>33</sup>. De acuerdo a lo establecido por el reporte global<sup>34</sup> y para Latinoamerica<sup>35</sup> de SENTRY, programa de vigilancia internacional que inici&oacute; en 1997 para monitorizar la incidencia y la susceptibilidad antimicrobiana de los pat&oacute;genos causantes de infecciones adquiridas en la comunidad y nosocomial, las tasas de resistencia a carbapen&eacute;micos son m&aacute;s elevadas en Latinoam&eacute;rica a comparaci&oacute;n de Estados Unidos y Europa, se estableci&oacute; que <i>Acinetobacter sp.</i> fue el microorganismo m&aacute;s prevalente y present&oacute; las mayores tasas de resistencia bacteriana en Latinoam&eacute;rica (10&#37;) a comparaci&oacute;n de otras regiones evaluadas, en las cuales se observ&oacute; resistencia alrededor del 5&#37;. De acuerdo al programa de vigilancia MYSTIC, programa de recolecci&oacute;n de informaci&oacute;n de test de susceptibilidad anual a meropenem, las tasas de resistencia al meropenem, imipenem, ceftazidima, piperacilina-tazobactam, ciprofloxacina y gentamicina en Am&eacute;rica Latina parecen estar entre las m&aacute;s altas en el mundo<sup>36</sup>. Por ejemplo, solo el 71&#37; de las cepas aisladas fueron sensibles a meropenem o imipenem en una evaluaci&oacute;n de un programa de vigilancia en el per&iacute;odo 2002-2004<sup>36</sup> y en un estudio de vigilancia realizado en Argentina, Brasil, Chile y Colombia en el periodo 1997-2001, las tasas de resistencia fueron m&aacute;s altas en Argentina, pero ning&uacute;n pa&iacute;s estuvo exento de cepas resistentes a m&uacute;ltiples f&aacute;rmacos<sup>37</sup>. Una variedad de carbapenemasas se han identificado en <i>A. baumannii</i> aislados en Am&eacute;rica Latina, incluyendo IMP-1 e IMP-6 en Brasil<sup>38,39</sup>, OXA-23 en Brasil y Colombia<sup>40,41</sup> y OXA- 58 en Argentina<sup>42</sup>.</p>      <p align="justify">En Colombia, seg&uacute;n informes del Ministerio de Salud y Protecci&oacute;n Social, dentro de los microorganismos multirresistentes aislados en Unidades de Cuidados Intensivos (UCI) del pa&iacute;s en el a&ntilde;o 2014, <i>A. baumannii</i> represent&oacute; el 3,1&#37;, con altos porcentajes de resistencia frente a los Carbapen&eacute;micos; sin embargo, comparando los datos con los reportados en el a&ntilde;o 2013, se observ&oacute; una ligera disminuci&oacute;n en el porcentaje de resistencia a esta familia de antibi&oacute;ticos oscilando entre 46,4&#37; y 54,7&#37;. Tambi&eacute;n se observ&oacute; incremento en la resistencia frente a colistina en relaci&oacute;n a lo reportado el a&ntilde;o 2013<sup>43</sup>. De acuerdo con el centro internacional de entrenamiento e investigaci&oacute;n medica, a traves de su grupo para el estudio de la resistencia nosocomial en Colombia, en un estudio de vigilancia fenot&iacute;pica y molecular de la resistencia antimicrobiana de bacilos gram negativos aislados durante el periodo de enero de 2009 a diciembre de 2012 en UCI de 23 cl&iacute;nicas y hospitales en Colombia, se estableci&oacute; que los bacilos gram negativos continuan siendo los microorganismos m&aacute;s frecuentemente aislados, representando <i>A. baumannii</i> el 19.3&#37;. En este periodo de tiempo <i>A. baumannii</i> conserv&oacute; un perfil fenot&iacute;pico de multirresistencia, presentando un incremento en la resistencia a carbapen&eacute;micos a lo largo de los a&ntilde;os, la OXA-23 fue la carbapenemasa m&aacute;s frecuentemente detectada en el pa&iacute;s<sup>44</sup>.</p>      <p align="justify">Debido a la predilecci&oacute;n de <i>A. baumannii</i> por colonizar e infectar pacientes en estado cr&iacute;tico, que a menudo tienen un mal pron&oacute;stico independientemente de complicaciones infecciosas secundarias, ha sido dif&iacute;cil determinar el verdadero impacto cl&iacute;nico de este pat&oacute;geno, existiendo controversia en la literatura<sup>45,46</sup>. La mortalidad asociada por A. baumannii se determina entre el 26&#37; al 68&#37;<sup>46,47</sup>; sin embargo, es muy dif&iacute;cil determinar en estos pacientes la mortalidad atribuible a la infecci&oacute;n independientemente de la gravedad de sus enfermedades subyacentes. Estudios recientes concluyeron que la infecci&oacute;n o la colonizaci&oacute;n por <i>Acinetobacter</i> se asocia a un incremento de la mortalidad<sup>47,48</sup>, pero muchos de estos estudios estaban limitados por el peque&ntilde;o tama&ntilde;o de la muestra, las diferencias metodol&oacute;gicas, y la dificultad para controlar de forma adecuada la gravedad de la enfermedad de base del paciente. Otros estudios que controlaron de forma rigurosa la gravedad de la enfermedad no encontraron que la infecci&oacute;n por <i>Acinetobacter</i> fuera un factor independiente de mortalidad<sup>46</sup>. Por lo cual se puede considerar que la infecci&oacute;n por <i>Acinetobacter</i> es un marcador de aumento de la mortalidad en pacientes con enfermedad subyacente grave m&aacute;s que un predictor independiente de mortalidad<sup>47</sup>.</p>      <p align="justify">El control y el manejo de las infecciones hospitalarias se han convertido en un problema fundamental para la atenci&oacute;n en salud. Las infecciones adquiridas en los hospitales incrementan la morbilidad, la mortalidad y la estancia hospitalaria, adem&aacute;s causan un enorme impacto en los costos. Por ejemplo, se considera que el aumento promedio en los Estados Unidos por cada una de estas infecciones supera los US&#36; 15.000<sup>49</sup>. La infecci&oacute;n por <i>Acinetobacter</i> se asocia con un incremento en la morbilidad y una prolongaci&oacute;n de la estancia hospitalaria. Un estudio retrospectivo mostr&oacute; que los pacientes con bacteriemia por <i>Acinetobacter</i> presentaban una prolongaci&oacute;n del tiempo de requerimiento de ventilaci&oacute;n mec&aacute;nica y de estancia en UCI en 5 d&iacute;as, en comparaci&oacute;n con pacientes cr&iacute;ticamente enfermos pero sin bacteremia por este microorganismo<sup>50</sup>. La infecci&oacute;n por <i>Acinetobacter</i> multirresistente ha demostrado prolongar en forma significativa la duraci&oacute;n de la estancia en UCI, en promedio 6 d&iacute;as, y la media de estancia hospitalaria global en promedio en 18 d&iacute;as<sup>46</sup>.</p>      <p align="justify">Las especies de <i>Acinetobacter</i> se consideran microorganismos poco virulentos, salvo en pacientes cr&iacute;ticamente enfermos o inmunocomprometidos, por lo que se asocian m&aacute;s a menudo con infecciones nosocomiales que comunitarias<sup>51</sup>. Sin embargo, en regiones tropicales existen reportes, de neumon&iacute;a adquirida en la comunidad ocasionada por <i>A. baumannii</i>, que com&uacute;nmente se presentan en meses h&uacute;medos y c&aacute;lidos<sup>52,53</sup>. Entre los factores de riesgo que predisponen a los pacientes a la colonizaci&oacute;n o infecci&oacute;n por cepas de <i>A. baumannii</i> multirresistente se encuentran los factores dependientes del hospedero como enfermedad grave, infecci&oacute;n o sepsis previa, cirug&iacute;a mayor reciente, traumatismo, quemaduras, y factores externos como la estancia hospitalaria prolongada, ingreso prolongado en UCI, ingreso en un servicio donde <i>A. baumannii</i> sea end&eacute;mico, exposici&oacute;n a equipo m&eacute;dico contaminado, ventilaci&oacute;n mec&aacute;nica, uso de dispositivos intravasculares, sonda vesical, tubos de drenaje<sup>54-56</sup>; as&iacute; mismo se ha asociado el uso previo de antimicrobianos con la colonizaci&oacute;n e infecci&oacute;n por <i>Acinetobacter</i>, situaci&oacute;n que refuerza la necesidad de un uso prudente de los antimicrobianos<sup>54,57,58</sup>.</p>      <p align="center"><font size="3"><b><u>H&Aacute;BITAT NATURAL</u></b></font></p>      <p align="justify">Las especies de <i>Acinetobacter</i> pueden ser aisladas de objetos animados e inanimados, crecen en casi todas las muestras de suelos y agua fresca<sup>51</sup>. En el medio hospitalario, estos microorganismos han sido aislados de humidificadores, equipos de ventilaci&oacute;n, hojas de laringoscopio, cortinas, piel del personal de salud, colchones, cojines y otros equipos<sup>52,59,60</sup>. Se ha reportado una supervivencia en superficies secas mayor a siete d&iacute;as para <i>A. lwoffi</i> y mayor a 25 d&iacute;as para <i>A. baumannii. A. calcoaceticus</i> sobrevive hasta 13 d&iacute;as en superficies de formica<sup>61</sup>. La persistencia de las especies de <i>Acinetobacter</i> en las superficies medioambientales es su caracter&iacute;stica m&aacute;s distintiva entre los pat&oacute;genos nosocomiales, explicando su mayor patogenicidad entre pacientes hospitalizados<sup>61</sup>. No todas las especies del g&eacute;nero <i>Acinetobacter</i> tienen su h&aacute;bitat natural en el medio ambiente; aunque un estudio sistem&aacute;tico para investigar la presencia natural de los distintas especies de <i>Acinetobacter</i> en el medio ambiente no ha sido realizado<sup>62</sup>.</p>      <p align="justify">Un estudio epidemiol&oacute;gico realizado por Seifert <i>et al</i>.<sup>23</sup> encontr&oacute; que el 43&#37; de los individuos no hospitalizados estaban colonizados por especies del g&eacute;nero <i>Acinetobacter</i>. Las especies aisladas con mayor frecuencia fueron <i>A. lwoffii</i> (58&#37;), <i>A. johnsonii</i> (20&#37;), <i>A. Junii</i> (10&#37;), y <i>Acinetobacter especie gen&oacute;mica 3</i> (6&#37;). En un estudio similar realizado por Berlau <i>et al</i>.<sup>63</sup> se aisl&oacute; especies de Acinetobacter en el 44&#37; de portadores asintomaticos, siendo las especies mas prevalentes <i>A. lwoffii</i> (61&#37;), <i>Acinetobacter especies gen&oacute;mica 15BJ (12&#37;), A. radioresistens (8&#37;) y Acinetobacter especie gen&oacute;mica 3 (5&#37;)</i>. De cauerdo a los resultados obtenidos en el estudio de Buxton <i>et al</i>.<sup>64</sup> un tercio de los trabajadores sanitarios presentaron colonizaci&oacute;n transitoria por <i>A. calcoaceticus</i> en sus manos; la faringe, vagina y recto fueron sitios excepcionales de colonizaci&oacute;n. Existen informes de aislamientos ocasionales de <i>A. baumannii</i> apartir de mam&iacute;feros, piojos y verduras, aunque hay controversia si estas cepas, que son poco frecuentes en los animales, sean el resultado de contaminaci&oacute;n del medio ambiente por reservorios primarios del ambiente hospitalario o son reservorios naturales alternativos de esta especie<sup>65</sup>.</p>      <p align="center"><font size="3"><b><u>FACTORES DE VIRULENCIA</u></b></font></p>      ]]></body>
<body><![CDATA[<p align="justify">Hasta la fecha, poco se ha dilucidado en relaci&oacute;n a los factores de virulencia de <i>A. baumannii</i> (Ver <a href="#f02">Figura 2</a>). Si bien se cree son varios los factores que pueden contribuir a la potencial virulencia de <i>A. baumannii</i>, un factor en particular, la proteina OmpA, un miembro de las prote&iacute;nas de membrana externas, se considera es uno de los principales determinantes en su capacidad de virulencia<sup>66</sup>. OmpA se une a la c&eacute;lula epitelial y a las mitocondrias del hospedero, desencadenando edema y disfunci&oacute;n mitocondrial y finalmente apoptosis, lo que sugiere que esta puede ser una v&iacute;a por la cual <i>A. baumannii</i> induce da&ntilde;o a humanos durante la infecci&oacute;n<sup>66</sup>. La OmpA es la prote&iacute;na de superficie m&aacute;s abundante de este pat&oacute;geno y est&aacute; implicado en la resistencia al sistema de complemento y la formaci&oacute;n de biopel&iacute;culas, dos importantes mecanismos que ayudan a promover su supervivencia tanto dentro como fuera del hospedero. La capacidad de <i>A. baumannii</i> para formar biopel&iacute;culas permite su crecimiento constante en condiciones ambientales desfavorables, como vidrio y material inerte de los equipos m&eacute;dicos<sup>67,68</sup>.</p>      <p align="center"><a name="f02"></a><img src="img/revistas/muis/v29n2/v29n2a11f2.jpg"></p>      <p align="justify">Otro factor de virulencia en estudio es el Lipopolisac&aacute;rido (LPS) que contiene la fracci&oacute;n de l&iacute;pido A, el n&uacute;cleo de hidratos de carbono y el ant&iacute;geno O. En un estudio realizado por Luke et al.<sup>69</sup> se investig&oacute; el papel del LPS en la patog&eacute;nesis de la bacteria, mediante el empleo de una cepa mutante que carec&iacute;a de la glucotransferasa del LPS tipo B que produjo un LPS con solamente dos residuos de carbohidratos unidos al l&iacute;pido A. Este mutante mostr&oacute; menor resistencia al suero humano y menor supervivencia en modelos de ratas con infecci&oacute;n de tejidos blandos, a comparaci&oacute;n con la cepa no manipulada, lo que indica el papel de los residuos de hidratos de carbono de los LPS en la patog&eacute;nesis. La proteina CD14 presente en la membrana plasm&aacute;tica de las c&eacute;lulas del hospedero, desempe&ntilde;a un papel importante en la erradicaci&oacute;n de <i>A. baumannii</i> desde el pulm&oacute;n, mediante la interacci&oacute;n con el LPS, lo que sugiere un rol de estos en la activaci&oacute;n la respuesta inmune<sup>70</sup>.</p>      <p align="justify">Fregolino <i>et al</i>.<sup>71</sup> reportaron las estructuras de los polisac&aacute;ridos capsulares de dos cepas aisladas de <i>A. baumannii</i>, revelando un aminopolisac&aacute;rido lineal conformado por tres residuos de carbohidratos en una cepa y una pentasac&aacute;rido ramificado en la otra. Adem&aacute;s del LPS, los polisac&aacute;ridos capsulares tambi&eacute;n han sido identificados como factor de patogenicidad en <i>A. baumannii</i>. En un estudio realizado por Russo et al.<sup>72</sup> donde se usaron mutantes en el gen <i>ptk</i> o <i>epsA</i>, condujo a la producci&oacute;n de c&aacute;psulas bacterianas alteradas, observ&aacute;ndose menor crecimiento en suero humano y liqu&iacute;do asc&iacute;tico, al compararlas con cepas silvestres. Ademas, se desmostr&oacute; en un modelo de infecci&oacute;n de tejidos blandos en ratas, que las cepas con la capsula alterada fueron completamente eliminadas a las 24 horas posinfecci&oacute;n, mientras que cepas silvestres persistieron en una cantidad mayor a 10<sup>7</sup> bacterias/ml en el mismo tiempo. Por lo que se plantea que los polisac&aacute;ridos capsulares desempe&ntilde;an un papel importante en la protecci&oacute;n de las bacterias de la respuesta inmune innata del hu&eacute;sped.</p>      <p align="justify">Las ves&iacute;culas de membrana externa est&aacute;n constituida por componentes de la membrana externa, prote&iacute;nas peripl&aacute;smicas, fosfol&iacute;pidos y LPS, estas han sido implicadas tambien en la virulencia del <i>A. baumannii</i>, favoreciendo la entrada de factores de virulencia en las c&eacute;lulas del hospedero, la transferencia horizontal de los genes y la protecci&oacute;n de las bacterias a la respuesta inmune<sup>73,74</sup>. Un an&aacute;lisis prote&oacute;mico de estas ves&iacute;culas identific&oacute; la presencia de las prote&iacute;nas OmpA, proteasas y hemolisinas, de tal forma que las ves&iacute;culas facilitar&iacute;an la entrada al interior de las c&eacute;lulas eucariotas de la OmpA y de esta forma se inducir&iacute;a la muerte celular, como fue desmostrado por los estudios de Jin <i>et al</i>.<sup>75</sup> quienes estableceieron que la exposici&oacute;n de c&eacute;lulas eucariotas a las ves&iacute;culas de membrana externa de una cepa deficiente de OmpA no produc&iacute;a muerte celular.</p>      <p align="justify">Las fosfolipasas bacterianas son enzimas lipol&iacute;ticas que catalizan la escisi&oacute;n de fosfolipidos, la alteraci&oacute;n de genes de la fosfolipasa D presentes en <i>A. baumannii</i> reduce su capacidad de supervivencia en el suero humano y la capacidad para invadir las c&eacute;lulas epiteliales. Se considera que estas enzimas contribuyen en la patog&eacute;nesis, favoreciendo la lisis de la c&eacute;lulas del hu&eacute;sped, mediante la escisi&oacute;n de los fosfolipidos presentes en la membrana celular y degradaci&oacute;n de los fosfolipidos presentes en las barreras mucosas, favoreciendo la entrada del pat&oacute;geno<sup>76</sup>. En un estudio realizado por Camarena <i>et al</i>.<sup>77</sup> se observ&oacute; que la inactivaci&oacute;n de uno los genes responsaables de la Fosfolipasa C conllev&oacute; a la disminuci&oacute;n de la habilidad del pat&oacute;geno para inducir muerte celular en las c&eacute;lulas epiteliales del hu&eacute;sped a comparaci&oacute;n con cepas no manipuladas.</p>      <p align="justify">Las Prote&iacute;nas de Uni&oacute;n a Penicilina (PBP) generalmente se asocian con la uni&oacute;n y la inactivaci&oacute;n de los antibi&oacute;ticos &#946;-lact&aacute;micos. Sin embargo, las proteinas PBP tambi&eacute;n participan en las etapas finales de la bios&iacute;ntesis de la capa de peptidoglicano y por tanto contribuyen a la estabilidad de la c&eacute;lula bacteriana<sup>78</sup>. En un estudio realizado por Russo <i>et al</i>.<sup>72</sup> donde se us&oacute; una cepa mutante en el gen <i>pbpG</i>, que codifica PBP7/8, mostr&oacute; un crecimiento reducido en liquido asc&iacute;tico y suero humano. Un an&aacute;lisis por microscop&iacute;a electr&oacute;nica de estas cepas mutantes y silvestres mostr&oacute; una diferencia en la morfolog&iacute;a bacteriana, apoyando la idea de que la falta de PBP7/8 puede afectar a la estabilidad celular, posiblemente a trav&eacute;s de efectos sobre la capa de peptidoglicano.</p>      <p align="center"><font size="3"><b><u>MANIFESTACIONES CL&Iacute;NICAS</u></b></font></p>      <p align="justify">La neumon&iacute;a asociada a ventilador es com&uacute;nmente vinculada a infecci&oacute;n por <i>A. baumannii</i><sup>79</sup>. Largos periodos de hospitalizaci&oacute;n, tiempo prolongado de ventilaci&oacute;n mec&aacute;nica y uso previo de antibi&oacute;ticos son los factores de riesgo reconocidos. Se han descrito brotes nosocomiales por manos de profesionales de la salud colonizadas y pobre higiene personal<sup>21</sup>. Ventiladores contaminados y equipo de cuidado respiratorio son tambi&eacute;n otras fuentes de transmisi&oacute;n y factores de riesgo para esta patolog&iacute;a<sup>80</sup>. En grandes estudios de vigilancia realizados en Estados Unidos, entre 5&#37; y 10&#37; de los casos de neumon&iacute;a adquiridas en UCI se debieron a <i>A. baumannii</i><sup>81</sup>.</p>      <p align="justify">Han sido reportados casos de neumon&iacute;a adquirida en la comunidad en regiones tropicales de Australia y Asia<sup>82,83</sup>. Se caracteriza por un curso cl&iacute;nico fulminante, secundario a bacteriemia, con tasas de mortalidad del 40&#37; al 60&#37;<sup>83</sup>. Aunque es muy poco frecuente la aparici&oacute;n de enfermedad por este microorganismo en personas inmunocompetentes, se observ&oacute; en estos casos un historial de excesivo consumo de alcohol, y se asoci&oacute; como probable fuente de infecci&oacute;n la presencia de este microorganismo como parte de la flora de la faringe<sup>82</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">En un estudio realizado en Estados unidos por Wisplinghoff <i>et al</i>.<sup>84</sup> sobre infecciones nosocomiales del torrente sangu&iacute;neo, <i>Acinetobacter</i> represent&oacute; el 1,3&#37; del total de infecciones. Fue la causa m&aacute;s com&uacute;n de infecci&oacute;n adquirida en UCI a comparaci&oacute;n de las infecciones no adquiridas en UCI, 1,6&#37; frente a 0,9&#37; respectivamente. La tasa de mortalidad oscilo entre 34,0&#37; a 43,4&#37; en UCI y 16.3&#37; fuera de UCI. La infecci&oacute;n por <i>A. baumannii</i> tuvo el tercer lugar en las tasa de mayor mortalidad en UCI, s&oacute;lo superado por <i>P. aeruginosa</i> y <i>C&aacute;ndida sp</i>.</p>      <p align="justify">Se ha observado que <i>A. baumannii</i> puede en forma ocasional causar infecciones de piel y tejido blando fuera de la poblaci&oacute;n militar, en un estudio realizado por Gaynes et al.<sup>81</sup> este microorganismo fue responsable del 2,1&#37; de las infecciones en piel y tejidos blandos adquiridas en UCI. Es un pat&oacute;geno bien conocido en unidades de quemados y puede ser dif&iacute;cil de erradicar en este tipo de pacientes<sup>85</sup>, en un estudio retrospectivo realizado por Sebeny et al.<sup>14</sup> donde observaron 57 pacientes con lesiones de guerra, mostro que ocho casos fueron infectados con <i>Acinetobacter</i>, todos eran varones, de edades entre 13 y 55 a&ntilde;os, de nacionalidad estadounidense e iraqu&iacute;. Todos los pacientes tuvieron una presentaci&oacute;n cl&iacute;nica similar, celulitis con una caracter&iacute;stica apariencia de &quot;piel de naranja&quot;, con posterior evoluci&oacute;n a formaci&oacute;n de ampollas en la superficie de la piel. La tasa de mortalidad que se encontr&oacute; fue de 12,5&#37;. <i>A. baumannii</i> es una causa ocasional de infecci&oacute;n de v&iacute;as urinarias, en el estudio realizado por Gaynes et al.<sup>81</sup> fue responsable del 1,6&#37; de las mismas adquiridas en UCI, asociada a infecci&oacute;n o colonizaci&oacute;n por cat&eacute;ter vesical. La meningitis por <i>A. baumannii</i> es una entidad cada vez m&aacute;s importante, predomina a nivel nosocomial posterior a procedimientos neuroquir&uacute;rgicos<sup>86-88</sup>, la presencia de un drenaje ventricular externo se convierte en el principal factor de riesgo para esta patolog&iacute;a. La tasa de mortalidad puede llegar hasta el 70&#37;, aunque es motivo de controversia<sup>86</sup>.</p>      <p align="justify">En la literatura se han encontrado un peque&ntilde;o n&uacute;mero de casos reportados de endocarditis por <i>A. baumannii</i>, la mayor&iacute;a de ellos con el antecedente de reemplazo valvular<sup>89-92</sup>. <i>Acinetobacter sp</i>. tambi&eacute;n puede producir endoftalmitis o queratitis, algunos casos relacionados con uso de lentes de contacto o posterior a cirug&iacute;as oculares<sup>93-95</sup>.</p>      <p align="center"><font size="3"><b><u>RESISTENCIA ANTIBIOTICA</u></b></font></p>      <p align="justify">M&uacute;ltiples estudios han reportado altas tasas de resistencia antimicrobiana en <i>Acinetobacter sp</i>., sus patrones de resistencias var&iacute;an seg&uacute;n la especie aislada y la zona geogr&aacute;fica<sup>96</sup>. En un estudio realizado por Seifert <i>et al</i>.<sup>97</sup> informaron que <i>A. baumannii</i> es generalmente m&aacute;s resistente que <i>A. lwoffi</i> y otras especies de <i>Acinetobacter</i>. Las especies de <i>Acinetobacter</i> pueden adquirir genes de resistencia procedentes de otros microorganismos, desarrollar a lo largo del tiempo mutaciones que ocasionan resistencia o, bajo presi&oacute;n antimicrobiana selectiva, determinadas subpoblaciones con resistencia preexistente emergen y se hacen dominantes. Estos tres procesos no son excluyentes y probablemente coexistan en las cepas de <i>Acinetobacter</i> resistentes.<sup>98</sup></p>      <p align="justify">Los mecanismos de resistencia se agrupan en tres categor&iacute;as: Enzimas inactivadoras de antimicrobianos, limitaci&oacute;n del acceso a las dianas bacterianas, y mutaciones que alteran las dianas o funciones celulares.<sup>99</sup> A continuaci&oacute;n se detallaran los principales mecanismos de resistencia por grupo de antimicrobianos (Ver <a href="#t01">Tabla 1</a>).</p>      <p align="center"><a name="t01"></a><img src="img/revistas/muis/v29n2/v29n2a11t1.jpg"></p>      <p align="justify"><b>BETALACT&Aacute;MICOS</b>    <br>    <br> En <i>A. baumannii</i> el mecanismo de resistencia m&aacute;s importante a los antibi&oacute;ticos &#946;-lact&aacute;micos es la degradaci&oacute;n enzim&aacute;tica por &#946;-lactamasas cromosomales o plasmidiales, aunque m&uacute;ltiples mecanismos act&uacute;an en concierto<sup>100-101</sup>. Las &#946;-lactamasas se dividen en cuatro grupos: clase A de Ambler (Penicilinasas), clase B de Ambler (Metaloenzimas), clase C de Ambler (Cefalosporinasas) y clase D de Ambler (Oxacilinasas)<sup>102</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">Las &#946;-lactamasas de clase A se han reportado raramente en <i>Acinetobacter sp.</i> y <i>Pseudomonas sp</i>.<sup>103,104</sup> Entre estas encontramos &#946;-lactamasas de espectro reducido:TEM-1 y TEM-2<sup>105,106</sup>, pero su importancia cl&iacute;nica actual es limitada dada la potencia de otros determinantes de resistencia. A este grupo tambi&eacute;n hace parte las &#946;-lactamasas de espectro extendido, los microorganismos poseedores este tipo de &#946;-lactamasas son distintivamente inhibidos por el acido clavul&aacute;nico y son resistentes a los oximino-&#946;-lact&aacute;micos por ejemplo cefotaxima, ceftriaxona, cefpodoxima o ceftazidima.</p>      <p align="justify">Las &#946;-lactamasas clase B, m&eacute;talo-&#946;-lactamasas, son enzimas dependientes de zinc cuya actividad es inhibida por el &aacute;cido <b>etildiaminotetraac&eacute;tico</b>, pero no por carbapen&eacute;micos o inhibidores de &#946;-lactamasas como el acido clavul&aacute;nico, tazobactam y sulbactam. Estas enzimas tienen la capacidad de hidrolizar todos los &#946;-lact&aacute;micos, incluyendo los carbapen&eacute;micos, excepto el monobact&aacute;mico aztreonam<sup>107</sup>. Se ha identificado tres grupos, IMP<sup>38,108-110</sup>, VIM<sup>110-113</sup> y SIM<sup>114</sup>. Las &#946;-lactamasas clase C, tambi&eacute;n denominada Cefalosporinasas derivadas de <i>Acinetobacter</i><sup>115</sup>, son codificadas cromos&oacute;micamente por todas las cepas de <i>A. baumannii</i><sup>115,116</sup>. Su presencia se correlaciona con resistencia a cefalosporinas de espectro extendido<sup>117</sup>. Cefepima y carbapen&eacute;micos parecen ser estables frente a estas enzimas<sup>115</sup>.</p>      <p align="justify">Las oxacilinasas (OXA), &#946;-lactamasas de clase D, tambi&eacute;n se encuentran en especies de <i>Acinetobacter</i>; existen m&uacute;ltiples subtipos que tienen diversos patrones de hidr&oacute;lisis pero, en general, las oxacilinasas hidrolizan d&eacute;bilmente a carbapen&eacute;micos, imipenem y meropenem y no hidrolizan cefalosporinas de espectro extendido ni aztreonam. Su acci&oacute;n hidrol&iacute;tica es inhibida por &aacute;cido clavul&aacute;nico<sup>98</sup>. La primera enzima de tipo OXA fue identificada en 1985 en Edimburgo, Escocia<sup>118</sup>, este determinante de resistencia, inicialmente nombrada <i>ARI-1</i>, se encontr&oacute; que era transferible, y el gen fue posteriormente secuenciado y nombrado <i>bla</i>OXA-23<sup>119,120</sup>. OXA-27 y OXA-49 son enzimas estrechamente relacionadas y conforman el grupo del gen <i>bla</i>OXA-23 en <i>A. Baumannii</i><sup>121,122</sup>. El <i>bla</i>OXA-24 que codifica OXA-24, 25, 26 y 40<sup>119,123,124</sup> y el <i>bla</i>OXA-58<sup>42,125,126</sup> son otros 2 genes OXA descritos con actividad carbapenemasa. El gen <i>bla</i>OXA-58 y <i>bla</i>OXA-23 son codificados por pl&aacute;smidos, lo que puede explicar su distribuci&oacute;n generalizada<sup>126-128</sup>. El gen <i>bla</i>OXA-51 que codifica OXA- 51, 64, 65, 66, 68, 69, 70, 71, 78, 79, 80 y 82 es el &uacute;nico que se manifiesta en forma natural en <i>A. baumannii</i>, de ah&iacute; su localizaci&oacute;n cromos&oacute;mica<sup>129-131</sup>.</p>      <p align="justify">En resistencia a &#946;-lact&aacute;micos se han encontrado mecanismos no enzim&aacute;ticos, entre los cuales se encuentran cambios en las prote&iacute;nas de membrana externa OMPs<sup>100,101,132,133</sup>, bombas de eflujo multif&aacute;rmaco<sup>134</sup> y alteraciones en la afinidad o expresi&oacute;n de las prote&iacute;nas de uni&oacute;n a penicilina PBP<sup>132,135</sup>. Poco se sabe acerca de las porinas de la membrana externa de <i>A. baumannii</i>, recientemente se estableci&oacute; que la prote&iacute;na 29 kDa, tambi&eacute;n conocida como CarO, se asocia con resistencia a imipenem y meropenem<sup>133,136,137</sup>. Brotes cl&iacute;nicos de <i>A. baumannii</i> resistente a carbapen&eacute;micos debido a p&eacute;rdida de porinas, incluyen reducci&oacute;n de expresi&oacute;n de 47-, 44- y 37-kDa OMPs en cepas end&eacute;micas de <i>A. baumannii</i> en Nueva York<sup>138</sup> y reducci&oacute;n de la expresi&oacute;n de 22- y 33-kDa OMPs en asociaci&oacute;n con OXA-24 en Espa&ntilde;a<sup>139</sup>. Otros OMPs identificados relacionados con resistencia a &#946;-lact&aacute;micos incluyen la prote&iacute;na t&eacute;rmicamente modificable HMP-AB<sup>140</sup>, que es hom&oacute;loga a OmpA de Enterobacterias y OmpF de P. <i>aeruginosa</i>; prote&iacute;nas 33 a 36 kDa<sup>141</sup> que es homologa con OprD de <i>P. aeruginosa</i>; y OmpW<sup>142</sup>, que es hom&oacute;loga a prote&iacute;na OmpW que se encuentran en <i>E. coli</i> y <i>P. aeruginosa</i>.</p>      <p align="justify">En el estudio realizado por Fournier <i>et al</i>.<sup>143</sup> se observ&oacute; que el genoma de cepas <i>A. baumannii</i> multirresistentes codifica una amplia gama de sistemas de bomba eflujo multif&aacute;rmaco. La bomba de tipo familiar AdeABC es la mejor estudiada hasta el momento y favorece resistencia a &#946;-lact&aacute;micos, carbapen&eacute;micos, aminogluc&oacute;sidos, eritromicina, cloramfenicol, tetraciclinas, fluoroquinolonas y trimetoprim.<sup>134,144-147</sup> AdeABC es cromos&oacute;micamente codificada y, normalmente, est&aacute; regulado por un sistema de dos componentes, un sensor quinasa (AdeS) y su regulador de respuesta asociado<sup>146</sup>.</p>      <p align="justify"><b>AMINOGLUCOSIDOS</b>    <br>    <br> La resistencia a aminoglic&oacute;sidos est&aacute; mediada por tres mecanismos: alteraci&oacute;n del sitio de acci&oacute;n ribosomal, reducci&oacute;n de la captura y modificaci&oacute;n enzim&aacute;tica del antimicrobiano<sup>148</sup>. De estos, el tercer mecanismo es el que da cuenta de la mayor&iacute;a de cepas resistentes aisladas. Las enzimas modificadoras, tales como O-fosfotransferasas, O-nucleotidiltransferasas y N-acetiltransferasas, son codificadas primariamente por pl&aacute;smidos y transposones que pueden jugar un importante rol en la diseminaci&oacute;n de resistencia, aunque pueden tambi&eacute;n tener localizaci&oacute;n cromosomal<sup>148</sup>. M&aacute;s recientemente, la metilaci&oacute;n del sitio 16S ARNr se ha descrito para <i>A. baumannii</i> en cepas procedentes de Jap&oacute;n, Corea y Estados Unidos<sup>149-151</sup>. Este mecanismo de resistencia altera el sitio de uni&oacute;n del aminoglic&oacute;sido y confiere alto nivel de resistencia a todos los aminoglic&oacute;sidos cl&iacute;nicamente &uacute;tiles, incluyendo gentamicina, tobramicina y amikacina<sup>152</sup>. Aparte de la bomba de eflujo AdeABC, que es menos efectiva para transportar amikacina y kanamicina debido a su naturaleza mas hidr&oacute;fila a comparaci&oacute;n de los &#946;-lact&aacute;micos,<sup>145</sup> recientemente se ha descrito la bomba AdeM, que ofrece resistencia a aminogluc&oacute;sidos como gentamicina y kanamicina<sup>153</sup>.</p>      <p align="justify"><b>QUINOLONAS</b>    <br>    ]]></body>
<body><![CDATA[<br> Los mecanismos de resistencia relacionados con este grupo de antibi&oacute;ticos son mutaciones de la ADN girasa y la topo-isomerasa IV, blancos espec&iacute;ficos de estos medicamentos<sup>154</sup>. La ADN-girasa est&aacute; compuesta de dos subunidades, codificadas por los genes <i>gyr A</i> y <i>gyr B</i>. La topo-isomerasa IV es estructuralmente similar a la ADN-girasa, sus dos subunidades est&aacute;n codificadas por los genes <i>parC</i> y <i>parE</i>. La resistencia en <i>Acinetobacter sp.</i> est&aacute; mediada por mutaciones en los genes <i>gyr A</i> y <i>par C</i><sup>154</sup>. Similar a los aminogluc&oacute;sidos, muchas quinolonas tambi&eacute;n son sustratos de bombas de eflujo multif&aacute;rmaco<sup>155</sup>, incluyendo la bomba AdeABC<sup>145</sup> y la bomba AdeM<sup>145</sup>.</p>      <p align="justify"><b>TETRACICLINAS Y GLICILCICLINAS</b>    <br>    <br> La resistencia a las tetraciclinas y sus derivados puede ser mediada por bombas de eflujo o protecci&oacute;n ribosomal<sup>156</sup>. Bombas de eflujo especificas para Tetraciclinas incluyen las codificadas por los determinantes <i>tet(A)</i> a <i>tet(E)</i>, encontradas con mayor frecuencia en organismos gramnegativos, y el <i>tet(K)</i> determinante encontrado en <i>S. aureus</i>. Se han encontrado <i>tet(A)</i> y <i>tet(B)</i> en <i>A. Baumannii</i>. <i>Tet(A)</i> confiere resistencia a la tetraciclina pero no minociclina<sup>157-159</sup>. La protecci&oacute;n ribosomal est&aacute; mediada por los determinante <i>tet (M)</i> y <i>tet (O)</i><sup>159</sup>. Adem&aacute;s de las bombas de eflujo espec&iacute;ficos para tetraciclina, estos antibacterianos tambi&eacute;n son susceptibles de bombas de eflujo multif&aacute;rmacos, como la bomba AdeABC<sup>145</sup>. Tigeciclina, una clase de antimicrobianos conocidos como glicilciclinas, es tambi&eacute;n un sustrato para este sistema bombas de eflujo<sup>160,161</sup>.</p>      <p align="justify"><b>POLIMIXINAS</b>    <br>    <br> A pesar de los recientes informes que demuestran el aumento de la resistencia in vitro de <i>A. baumannii</i> a las polimixinas, el mecanismo de resistencia se desconoce<sup>162,163</sup>. Se ha demostrado en otros microorganismos que la reducci&oacute;n de la uni&oacute;n a los sitios diana en los lipopolisac&aacute;ridos confiere resistencia en <i>E. Coli, Salmonella sp.</i> y <i>P. aeruginosa</i><sup>164,165</sup>. Tambi&eacute;n se ha observado que cambios en las prote&iacute;nas de membrana externa confieren resistencia en <i>P. aeruginosa</i><sup>166,167</sup>.</p>      <p align="center"><font size="3"><b><u>TRATAMIENTO ACTUAL</u></b></font></p>      <p align="justify">Hasta el momento, los carbapen&eacute;micos se han considerado como agentes de elecci&oacute;n para las infecciones graves por <i>A. Baumannii</i>, sin embargo, aunque estos f&aacute;rmacos son todav&iacute;a activos contra la gran mayor&iacute;a de cepas de <i>A. Baumannii</i> alrededor del mundo, la utilidad cl&iacute;nica de esta clase de antimicrobianos es cada vez m&aacute;s amenazada por el surgimiento de mecanismos de resistencias, como se describi&oacute; anteriormente.<sup>159,145</sup></p>      <p align="justify">Esta revisi&oacute;n considera <i>A. baumannii</i> Multirresistente (AB-MR) las cepas con resistencia a m&aacute;s de dos de los siguientes grupos de antibi&oacute;ticos: Cefalosporinas antipseudom&oacute;nicas, cefepima y ceftazidima; carbapen&eacute;micos antipseudom&oacute;nicos, meropenem e imipenem; fluoroquinolonas, ciprofloxacinay levofloxacino; aminogluc&oacute;sidos, gentamicina, tobramicina y amikacina, o sulbactam<sup>20,168</sup>. <i>A. baumannii</i> panrresistentes (AB-PR) son cepas resistentes a los antibi&oacute;ticos de primera l&iacute;nea nombrados anteriormente, incluidos carbapen&eacute;micos, y que regularmente son s&oacute;lo susceptibles a polimixinas como colistina<sup>169,170</sup>, aunque ya existen reportes de cepas resistentes a colistina<sup>162,163</sup> (Ver <a href="#f03">Figura 3</a>).</p>      ]]></body>
<body><![CDATA[<p align="center"><a name="f03"></a><img src="img/revistas/muis/v29n2/v29n2a11f3.jpg"></p>      <p align="justify">Sulbactam es un inhibidor de &#946; -lactamasas, opci&oacute;n en el manejo de infecciones por AB-MR, se ha documentado que adem&aacute;s de tener actividad como inhibidor de &#946;-lactamasas, posee cierta actividad antimicrobiana intr&iacute;nseca contra <i>A. baumannii</i>. Los inhibidores de &#946;-lactamasas son utilizados para proteger antimicrobianos &#946;-lact&aacute;micos de la hidr&oacute;lisis de enzimas bacterianas. Actualmente existen tres tipos de inhibidores: &aacute;cido clavul&aacute;nico, sulbactam y tazobactam. Sulbactam tiene actividad contra <i>Neisseria gonorrhoeae, Neisseria meningitidis, Burkholderia cepacia y Acinetobacter sp</i>, los otros inhibidores de &#946;-lactamasas tienen menor actividad que sulbactam frente a <i>Acinetobacter sp</i>. La actividad antibacteriana de sulbactam es consecuencia de su uni&oacute;n irreversible con PBP 2<sup>171</sup>. La presencia de un betalact&aacute;mico, como la ampicilina, en combinaci&oacute;n con el inhibidor de las &szlig;-lactamasas, no parece producir sinergia<sup>172,173</sup>.</p>      <p align="justify">Diferentes estudios cl&iacute;nicos han demostrado la eficacia de Sulbactam en infecciones leves a severas de <i>A. baumannii</i>. Urban et al.<sup>174</sup> observaron en su estudio que 9 de 10 pacientes con infecci&oacute;n severa por <i>A. baumannii</i> y ventilaci&oacute;n mec&aacute;nica presentaron mejor&iacute;a cl&iacute;nica con el uso de ampicilina-sulbactam a dosis 3g de ampicilina y 1.5g de sulbactam cada 6 u 8 horas intravenoso. En 2003, un estudio realizado en Israel report&oacute; el uso de ampicilina/sulbactam en el manejo de AB-MR compar&aacute;ndolo con el est&aacute;ndar de cuidados en 94 pacientes con bacteriemia, comparados con el grupo est&aacute;ndar, el grupo de ampicilina/sulbactam no mostr&oacute; diferencias significativas en la mortalidad global con un 40,5&#37; versus 42,4&#37;, respectivamente. En los pacientes m&aacute;s gravemente enfermos, ampicilina/sulbactam se asoci&oacute; con mortalidad significativamente menor<sup>175</sup>. Algunas series de casos han mostrado resultados alentadores en el tratamiento de meningitis nosocomial por AB-MR con ampicilina sulbactam, aunque existe aun controversia en su uso para esta patolog&iacute;a<sup>176,177</sup>. La dosis &oacute;ptima de sulbactam para tratar infecciones graves por <i>A. baumannii</i> es desconocida, pero la mayor&iacute;a de los autores recomiendan por lo menos 6 g/d&iacute;a divididos en dosis para pacientes con funci&oacute;n renal normal. Se ha documentado dosificaci&oacute;n de hasta 12 g/d&iacute;a para el tratamiento de neumon&iacute;a adquirida en el hospital causada por AB-MR, sin mayores efectos adversos; sin embargo, los resultados fueron similares en los que recibieron 9 g/d&iacute;a<sup>178</sup>. Aun est&aacute; pendiente por aclarar si dosis m&aacute;s altas son m&aacute;s eficaces o reducen el riesgo de resistencia, o incluso si la ampicilina-sulbactam debe ser usada en combinaci&oacute;n con otros agentes<sup>179</sup>.</p>      <p align="justify">A pesar de la ausencia de ensayos cl&iacute;nicos controlados, los carbapen&eacute;micos imipenem, meropenem, o doripenem, siguen siendo una de las opciones terap&eacute;uticas m&aacute;s importantes para las infecciones graves causadas por AB-MR, puesto que tienen una excelente actividad y estabilidad bactericida frente a varias &#946;-lactamasas. Desafortunadamente, el aumento de la resistencia a los carbapen&eacute;micos est&aacute; creando desaf&iacute;os terap&eacute;uticos, especialmente teniendo en cuenta que la mayor&iacute;a de las cepas de <i>A. baumannii</i> que son resistente a los carbapen&eacute;micos tambi&eacute;n son resistentes a la mayor&iacute;a de otros antibi&oacute;ticos, excepto las polimixinas o tigeciclina, los datos disponibles son de estudios in vitro, en animales y estudios observacionales<sup>180,181</sup>. El programa de vigilancia MYSTIC ha documentado datos que sugieren que imipenem es m&aacute;s potente que meropenem para el tratamiento de infecciones por AB-MR<sup>182</sup>, las pruebas de sensibilidad de imipenem no predice la susceptibilidad a meropenem o viceversa<sup>182</sup>. Lesho et al.<sup>183</sup> describieron un caso mortal de neumon&iacute;a por <i>A. baumannii</i> que fue tratado con meropenem, basados en susceptibilidad de la cepa a imipenem, sin embargo, posteriormente se demostr&oacute; que la cepa era resistente a meropenem. El doripenem es un nuevo carbapen&eacute;mico con actividad in vitro frente a <i>A. baumannii</i>; aunque no parece tener ventajas en comparaci&oacute;n con imipenem y meropenem<sup>184</sup>.</p>      <p align="justify">Dentro de los aminoglicosidos, amikacina y tobramicina son dos agentes que parecen conservar actividad contra <i>A. baumannii</i>, dadas sus caracter&iacute;sticas farmacocin&eacute;ticas y farmacodinamicas generalmente se usan en combinaci&oacute;n con otro antimicrobianos, excepto en infecciones de v&iacute;as urinarias<sup>47,185</sup>. Debido a sus perfiles de toxicidad a menudo se limita su uso, especialmente para tratamientos de largo tiempo. En un estudio realizado por Gounden <i>et al</i>.<sup>186</sup> se compar&oacute; la eficacia y toxicidad de la tobramicina frente a la colistina en el tratamiento de infecci&oacute;n por <i>A. baumannii</i>, all&iacute; no encontraron diferencias estad&iacute;sticamente significativas en mortalidad en unidades de cuidados intensivos, diferencias en aumento de creatinina s&eacute;rica o tiempo de aclaramiento s&eacute;rico.</p>      <p align="justify">Minociclina y doxiciclina, que hacen parte del grupo de tetraciclinas, est&aacute;n disponibles por infusi&oacute;n intravenosa y la minociclina est&aacute; aprobada por la FDA para uso en infecciones por <i>Acinetobacter</i>. La tetraciclina no puede ser utilizada como un marcador sustituto, debido a que muchos aislamientos resistentes a la tetraciclina pueden ser susceptibles a la minociclina<sup>187</sup>. Son limitados los datos cl&iacute;nicos acerca del uso de minociclina y doxiciclina. Wood et al.<sup>188</sup> reportaron una peque&ntilde;a serie de casos de neumon&iacute;a asociada a ventilaci&oacute;n mec&aacute;nica por <i>A. baumannii</i> tratados con doxiciclina y minociclina, cinco pacientes ten&iacute;an cepas resistentes a todos los antimicrobianos salvo minociclina y doxiciclina, seis pacientes se consideraron con mejor&iacute;a cl&iacute;nica despu&eacute;s del tratamiento. Los investigadores concluyeron que estas tetraciclinas podr&iacute;an ser eficaces para tratar neumon&iacute;a asociada a ventilaci&oacute;n mec&aacute;nica por AB-MR.</p>      <p align="justify">La tigeciclina es un antimicrobiano que hace parte de las glicilciclinas, tiene actividad bacteriost&aacute;tica frente a <i>A. baumannii</i>, es un derivado semisint&eacute;tico de la minociclina e inhibe la subunidad ribos&oacute;mica 30S; su ventaja sobre antibi&oacute;ticos del grupo tetraciclinas es su capacidad de evadir los tradicionales mecanismos de resistencia espec&iacute;ficos para tetraciclinas, bombas de eflujo tet (B) y determinantes tet (M) y tet (O) que proporcionan protecci&oacute;n ribosomal, lo que le confiere un espectro de actividad m&aacute;s amplio<sup>189</sup>. A pesar de la gran actividad in vitro mostrada por tigeciclina, los datos cl&iacute;nicos siguen siendo limitados, en 155 cepas de distintas colecciones internacionales de seguimiento de resistencia, tigeciclina fue activa en 98,7&#37;<sup>190</sup>. Respuestas cl&iacute;nicas favorables han sido reportadas en el tratamiento de infecciones graves<sup>191</sup>; sin embargo, debido a la movimiento r&aacute;pido de la tigeciclina hacia los tejidos despu&eacute;s de administraci&oacute;n intravenosa, se recomienda evitar el uso de esta en infecciones del torrente sangu&iacute;neo por <i>A. baumannii</i><sup>192</sup>. Ya se han detectado resistencias de alto a nivel para este antibi&oacute;tico en algunas cepas, determinadas por la suprarregulaci&oacute;n de bombas de eflujo mediadas cromos&oacute;micamente<sup>193,194</sup>.</p>      <p align="justify">Las polimixinas fueron descubiertas en 1947, reconoci&eacute;ndose cinco componentes, polimixinas A - E<sup>195</sup>. S&oacute;lo polimixina B y E han sido utilizadas en cl&iacute;nica. Colist&iacute;n o polimixina E fue descrito por Koyama en 1949, sintetizado por el <i>Bacillus polymyxa subespecie colistinus</i><sup>196</sup>. Este agente se utiliz&oacute; originalmente durante las d&eacute;cadas del sesenta y setenta, pero dada su nefro y neurotoxicidad su prescripci&oacute;n era infrecuente. Su uso ha ido aumentando &uacute;ltimamente gracias a su potente actividad frente a bacterias gram-negativas. La mayor&iacute;a de los estudios cl&iacute;nicos que investigan el uso de polimixinas frente a microorganismos multiresistentes utilizan m&aacute;s bien colist&iacute;n que polimixina B<sup>197</sup>. Son bactericidas, con efecto concentraci&oacute;n dependiente, act&uacute;an sobre la pared celular bacteriana alterando su permeabilidad, llevando a la muerte celular por lisis<sup>196</sup>.</p>      <p align="justify">Los efectos adversos m&aacute;s frecuentes de colist&iacute;n son nefrotoxicidad, neurotoxicidad reversible y bloqueo neuromuscular. A nivel renal puede causar un efecto t&oacute;xico directo que resulta en necrosis tubular aguda. Los efectos neurot&oacute;xicos incluyen ataxia, confusi&oacute;n, disturbios visuales, v&eacute;rtigo e inestabilidad vasomotora. Puede causar bloqueo neuromuscular generador de falla respiratoria<sup>196</sup>.</p>      <p align="justify">Estudios observacionales han reportado tasas de curaci&oacute;n o mejor&iacute;a tras el tratamiento con colistina del 57-77&#37; en pacientes gravemente enfermos con diversas infecciones por AB-MR, incluyendo neumon&iacute;a, bacteriemia, sepsis, infecci&oacute;n intraabdominal e infecci&oacute;n del SNC<sup>79,198,199</sup>. Aunque faltan datos farmacocin&eacute;ticos de alta calidad, se ha demostrado que la colistina tiene una pobre penetraci&oacute;n en liquido cefalorraquideo y tejido pulmonar. En este sentido cobra especial inter&eacute;s la posibilidad de administraci&oacute;n de este antibi&oacute;tico v&iacute;a intratecal o intraventricular, as&iacute; como su uso en nebulizaci&oacute;n<sup>47,200</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">En un estudio realizado por Levin et al.<sup>198</sup> encontraron una tasa baja de respuesta, 25&#37;, en pacientes con neumon&iacute;a por AB-MR que fueron tratados con colistina parenteral. Otros estudios han reportado tasas de respuesta cl&iacute;nica m&aacute;s favorables entre un 56&#37; a un 61&#37; para el tratamiento con colistina parenteral de neumon&iacute;a asociada a ventilador por AB-MR<sup>201-203</sup>. Reportes de casos han mostrado adecuada respuesta de pacientes con meningitis por AB-MR con colistina parenteral, pero su eficacia para esta enfermedad sigue siendo poco clara<sup>204,205</sup>. M&uacute;ltiples series de casos informan el uso de polimixina intraventricular e intratecal, con o sin terapia parenteral, para el tratamiento de meningitis bacteriana por gram-negativos<sup>206-208</sup>. Una revisi&oacute;n realizada por Falagas et al.<sup>209</sup> de 31 informes que involucran 64 episodios de meningitis bacteriana por gram-negativos observaron un tasa de curaci&oacute;n de 80&#37;, incluyendo recuperaci&oacute;n para 10 de 11 pacientes con meningitis por <i>Acinetobacter</i>; la mayor&iacute;a de los pacientes recibieron terapia antimicrobiana sist&eacute;mica y administraci&oacute;n local de la polimixina, se observo toxicidad neurol&oacute;gica principalmente en los informes publicados antes de 1970, y la irritaci&oacute;n men&iacute;ngea fue la manifestaci&oacute;n m&aacute;s com&uacute;n<sup>209</sup>.</p>      <p align="justify">En el bolet&iacute;n entregado en el a&ntilde;o 2015 por el grupo para el control de la resistencia antimicrobiana en Bogot&aacute;, GREBO, en el cual se incluyeron instituciones de salud de ciudades colombianas como Bogot&aacute;, Manizales, Villavicencio, Ibagu&eacute;, Tunja, Neiva y Valledupar, se estableci&oacute; que la resistencia de A. <i>baumannii</i> a los carbapen&eacute;micos sigue siendo muy alta, (para meropenem 65,7&#37; en 2013 y 69,2&#37; en 2014), ampicilina sulbactam present&oacute; una ligera disminuci&oacute;n (46,1&#37; en 2013 y 37&#37; en 2014), y antibioticos de &uacute;ltima linea como colisitina fue de 0&#37; y tigeciclina 4,2&#37;. Por lo cual consideraron que en muchas instituciones de salud es probable que el tratamiento empirico para una infeccion por este microorganismo requiera de entrada el uso de polimixina asociada a tigeciclina y un carbapenemico o amikacina segun el escenario clinico, cada instituci&oacute;n deber&aacute; tomar las medidas necesarias seg&uacute;n su perfil de susceptibilidad frente a este microorganismo para evitar el uso masivo de polimixinas, &uacute;ltima opci&oacute;n terapeutica disponible para infecciones graves por este y otros microorganismos multirresistentes<sup>210</sup>.</p>      <p align="center"><font size="3"><b><u>SINERGIA Y TERAPIA COMBINADA</u></b></font></p>      <p align="justify">El uso de la terapia de combinaci&oacute;n para tratar microorganismos Gram negativos multiresistentes y panresistentes es un &aacute;rea de amplio inter&eacute;s actual<sup>211</sup>. Esta estrategia tiene como objetivo crear una combinaci&oacute;n de dos agentes a los cuales el organismo no sea susceptible por pruebas de laboratorio. Adem&aacute;s de tratar de mejorar la eficacia, la terapia de combinaci&oacute;n tambi&eacute;n puede ayudar a prevenir la aparici&oacute;n de resistencia cuando al menos un agente es activo in vitro<sup>212</sup>.</p>      <p align="justify">La falta de ensayos cl&iacute;nicos controlados hace dif&iacute;cil evaluar el papel de la sinergia o la terapia combinada en el tratamiento de la infecci&oacute;n por AB-MR y AB-PR. La mayor&iacute;a de los datos disponibles proceden de series de casos, modelos animales o estudios in vitro; diferentes estudios han mostrado resultados contradictorios para las mismas combinaciones de antibi&oacute;ticos. Montero et al.<sup>213</sup> estudiaron un modelo de neumon&iacute;a por <i>A. baumannii</i> multirresistente en ratones y encontraron que las combinaciones de rifampicina con imipenem, tobramicina o colistina, ten&iacute;an las mayores tasas de curaci&oacute;n. Un estudio cl&iacute;nico piloto posterior, sin embargo, alert&oacute; sobre el uso de rifampicina e imipenem para el tratamiento de infecciones por <i>Acinetobacter</i> resistente a carbapen&eacute;micos, debido a que los investigadores observaron una alta tasa de fallos terap&eacute;uticos y documentaron la aparici&oacute;n de resistencia a la rifampicina en un 70&#37; de los pacientes tratados con este r&eacute;gimen<sup>214</sup>. En un estudio realizado por Bernabeu et al.<sup>215</sup> la combinaci&oacute;n de imipenem y amikacina result&oacute; peor que el imipenem en monoterapia para el tratamiento de las neumon&iacute;as causadas por <i>Acinetobacter</i> resistente a imipenem, a pesar de la sinergia demostrada in vitro para estos dos agentes. Los resultados de terapias de combinaci&oacute;n de quinolonas son variados, en un estudio realizado por Ermertcan et al.<sup>216</sup> se observ&oacute; una baja eficacia con el uso de ciprofloxacina en <i>A. baumannii</i> resistente a ciprofloxacina; en el estudio realizado por Joly-Guillou et al.<sup>217</sup> se observ&oacute; falta de actividad reforzada de levofloxacino al ser combinada con imipenem o amikacina en un modelo de rat&oacute;n con neumon&iacute;a. Curiosamente, en el estudio realizado por Sander et al.<sup>218</sup> se observ&oacute; actividad reforzada cuando aztreonam fue probado en combinaci&oacute;n con otros &#946;-lact&aacute;micos con un grupo de cepas de AB-MR.</p>      <p align="justify">Debido a esta disparidad en resultados, la utilidad cl&iacute;nica de la sinergia in vitro sigue siendo dudosa, la mayor&iacute;a de los resultados para la terapia combinada son comparables a las tasas de curaci&oacute;n correspondientes a las terapias con colistina parenteral en monoterapia, y la gran variabilidad de los dem&aacute;s agentes que podemos usar limita la capacidad de extraer conclusiones respecto a la terapia combinada<sup>47</sup>.</p>      <p align="center"><font size="3"><b><u>ESTRATEGIAS FUTURAS DE MANEJO</u></b></font></p>      <p align="justify">Debido a la amplia resistencia a los antibi&oacute;ticos presentada por <i>A. baumannii</i>, como se mencion&oacute; anteriormente, se est&aacute;n desarrollando alternativas de manejo<sup>219,220</sup>, entre las cuales se encuentran:</p>      <p align="justify"><b>BACTERI&Oacute;FAGOS</b>    <br>    ]]></body>
<body><![CDATA[<br> Se est&aacute;n realizando estudios sobre terapia con bacteri&oacute;fagos como alternativa de tratamiento para tratar de contrarrestar el fen&oacute;meno de resistencia a los antibi&oacute;ticos, debido a la alta especificidad de los fagos y su capacidad para trabajar con rapidez<sup>221-223</sup>. En un estudio reciente realizado por Yang et al.<sup>224</sup> se ha aislado y caracterizado el bacteri&oacute;fago AB1 que ha demostrado ser eficaz contra <i>A. baumannii</i> y representa un nuevo potencial terap&eacute;utico.</p>      <p align="justify"><b>TERAPIA DE TRANSFERENCIA DE GENES BACTERICIDAS</b>    <br>    <br> Se basa en el uso de c&eacute;lulas donantes atenuadas que introducen por conjugaci&oacute;n genes bactericidas al microorganismo pat&oacute;geno; dentro de los microorganismos atenuados, se han hecho estudios con <i>E. coli</i> atenuada, que transportan el pl&aacute;smido con genes bactericidas que inhiben la s&iacute;ntesis de prote&iacute;nas, estos genes se encuentran reprimidos en la bacteria donadora, pero se activan al ser entregados a la bacteria receptora. Un estudio realizado por Shankar et al.<sup>225</sup> donde se us&oacute; este enfoque en quemadura de murinos, se demostr&oacute; que los ratones tratados con dosis &uacute;nica de 1.010 Unidades formadoras de colonias de c&eacute;lulas donantes que conten&iacute;an genes bactericidas ten&iacute;an niveles m&aacute;s bajos de <i>A. baumannii</i> en las heridas por quemadura en comparaci&oacute;n con los ratones no tratados.</p>      <p align="justify"><b>RADIOINMUNOTERAPIA</b>    <br>    <br> Aun no ha sido usada como opci&oacute;n terap&eacute;utica antimicrobiana en cl&iacute;nica, aunque en teor&iacute;a tiene la capacidad de seleccionar los microorganismo en forma r&aacute;pida y eficiente como lo observado con las c&eacute;lulas cancer&iacute;genas<sup>220</sup>. Este m&eacute;todo aprovecha la especificidad de las interacciones ant&iacute;geno-anticuerpo para entregar radionucleotidos que emanan dosis de radiaci&oacute;n citot&oacute;xica letales directamente a la c&eacute;lula diana, produciendo solo toxicidad hematol&oacute;gica transitoria en experimentaci&oacute;n con animales. La radioinmunoterapia ha sido adaptada con &eacute;xito para el tratamiento de infecciones bacterianas<sup>226</sup>, f&uacute;ngicas<sup>227</sup> y virales<sup>228</sup>, debido a que varios estudios han demostrado el desarrollo de anticuerpos contra <i>A. baumannii</i>, este m&eacute;todo apunta como una clara estrategia de manejo a futuro<sup>229,230</sup>.</p>      <p align="justify"><b>TERAPIA FOTODIN&Aacute;MICA</b>    <br>    <br> Este m&eacute;todo usa la combinaci&oacute;n de fotosensibilizantes no t&oacute;xicos con oxigeno para producir especies reactivas de oxigeno que oxidan biomol&eacute;culas y conllevan a la destrucci&oacute;n celular<sup>231</sup>. El uso de la terapia fotodin&aacute;mica para tratar infecciones bacterianas localizadas generalmente implica la aplicaci&oacute;n t&oacute;pica de un fotosensibilizante en el tejido infectado, seguido por iluminaci&oacute;n con luz infrarroja que es capaz de penetrar en el tejido<sup>232</sup>. Usando esta t&eacute;cnica en modelos de heridas por quemaduras en murinos, se ha demostrado que es eficaz contra <i>A. Baumannii</i><sup>233</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify"><b>TECNOLOG&Iacute;A DE NANOPART&Iacute;CULAS</b>    <br>    <br> El &oacute;xido n&iacute;trico ha demostrado tener una potente actividad antimicrobiana y jugar un papel importante en la modulaci&oacute;n de la inmunidad y la regulaci&oacute;n de la cicatrizaci&oacute;n de heridas. Usando la nanotecnolog&iacute;a basada en un hidrogel de silano, Friedman <i>et al</i>.<sup>234</sup> han dise&ntilde;ado un &oacute;xido n&iacute;trico estable liberado por una plataforma de nanopart&iacute;culas. Este enfoque tiene el potencial de servir como un antimicrobiano t&oacute;pico novedoso, econ&oacute;mico y de f&aacute;cil aplicaci&oacute;n. Ha demostrado ser eficaz para el tratamiento de infecciones cut&aacute;neas complejas, tales como las causadas por <i>A. Baumannii</i>. En un estudio realizado por Mihu <i>et al</i>.<sup>235</sup> se observ&oacute; el efecto del oxido n&iacute;trico por nanopart&iacute;culas en infecci&oacute;n de piel y tejidos blandos por <i>A. Baumannii</i> en murinos, comparados con los animales control, los ratones tratados con esta t&eacute;cnica mostraron reducciones significativas en carga bacteriana, mayores tasas de curaci&oacute;n de las heridas y reducci&oacute;n de la degradaci&oacute;n del col&aacute;geno por colagenasas bacterianas.</p>      <p align="center"><font size="3"><b><u>PREVENCI&Oacute;N</u></b></font></p>      <p align="justify">M&uacute;ltiples factores trabajan en conjunto para mantener la presencia de especies de AB-MR y AB-PR en el &aacute;mbito de la atenci&oacute;n de salud, entre los cuales se encontr&oacute; la presencia de pacientes susceptibles, la presencia de los pacientes ya colonizados o infectados con el pat&oacute;geno, presi&oacute;n selectiva por el uso de antimicrobianos, y el cumplimiento incompleto de los procedimientos para control de infecciones, esto &uacute;ltimo favorecido por la capacidad de este pat&oacute;geno para sobrevivir en el ambiente, como se expuso anteriormente, y una probable resistencia a agentes desinfectantes que se encuentra en estudio<sup>236</sup>. Este pat&oacute;geno se puede diseminar a trav&eacute;s del aire a distancias cortas mediante gotitas de agua y a trav&eacute;s de la descamaci&oacute;n de la piel de pacientes que est&aacute;n colonizados, pero el modo de transmisi&oacute;n m&aacute;s com&uacute;n es a trav&eacute;s de las manos del personal sanitario. Los pacientes que est&aacute;n colonizados o infectados por una cepa concreta de A. Baumannii pueden portar esta cepa en diferentes partes del cuerpo durante d&iacute;as e incluso semanas, y la colonizaci&oacute;n puede pasar inadvertida si la cepa epid&eacute;mica no se a&iacute;sla en muestras cl&iacute;nicas<sup>237</sup>.</p>      <p align="justify">Investigadores han reportado interrupci&oacute;n de la transmisi&oacute;n de <i>A. baumannii</i> posterior al reforzamiento de medidas para prevenci&oacute;n y control de infecciones, tales como higiene de manos, uso de m&eacute;todos de barrera y exhaustiva limpieza y desinfecci&oacute;n del ambiente hospitalario<sup>238-40</sup>. En otros casos la transmisi&oacute;n es m&aacute;s dif&iacute;cil de interrumpir, requiriendo aislamiento de pacientes, asignaci&oacute;n de personal asistencial para vigilancia, cultivos de vigilancia activa y cierre de las unidades<sup>241,242</sup>.</p>      <p align="justify">Adem&aacute;s de la transmisi&oacute;n, se reporta aparici&oacute;n de resistencia por presi&oacute;n selectiva debido a terapia antimicrobiana de amplio espectro, entre los cuales se encuentran carbapen&eacute;micos<sup>243</sup>, cefalosporinas de tercera generaci&oacute;n<sup>244</sup> y fluoroquinolonas<sup>245</sup>. En muchas instituciones de salud end&eacute;micas, infecciones por AB-MR han demostrado perfiles epidemiol&oacute;gicos complejos y coexistencia de m&uacute;ltiples cepas. En un estudio realizado por Abbo <i>et al</i>.<sup>246</sup> observaron 118 pacientes con infecci&oacute;n por AB-MR en Israel, se encontr&oacute; diez diferentes clones, as&iacute; como peque&ntilde;os grupos de pacientes con fuente com&uacute;n no identificada, a pesar de investigaci&oacute;n con pruebas moleculares. Tipificaci&oacute;n de cepas basados en m&eacute;todos moleculares se puede utilizar para identificar brotes de infecci&oacute;n y supervisar transmisi&oacute;n interinstitucional, regional e internacional de especies de Acinetobacter multirresistentes<sup>247,248</sup>. Por ejemplo, durante un per&iacute;odo de brote en los Pa&iacute;ses Bajos que afect&oacute; a ocho hospitales, se encontr&oacute; una de las cepas en tres de esos centros y otra cepa en otros dos<sup>249</sup>. Hay datos similares que apoyan la diseminaci&oacute;n interhospitalaria de cepas multirresistentes en determinadas zonas geogr&aacute;ficas de Rep&uacute;blica Checa, Reino Unido, Portugal y Estados Unidos<sup>237</sup>.</p>      <p align="justify">En los &uacute;ltimos a&ntilde;os ha crecido la preocupaci&oacute;n acerca del papel de la resistencia a los desinfectantes. Susceptibilidad reducida de <i>S. aureus</i> resistente a meticilina, frente <i>S. aureus</i> sensible a meticilina, a la clorhexidina y compuestos de amonio cuaternario han sido reportados<sup>250</sup>. Observaciones similares fueron hechas en bacterias gramnegativas como <i>P. aeruginosa</i><sup>251</sup>. Se ha especulado que la resistencia a desinfectantes puede contribuir a la aparici&oacute;n de brotes epid&eacute;micos por <i>A. baumannii</i>, aunque existe controversia. En un estudio realizado por Wisplinghoff <i>et al</i>.<sup>252</sup> se compar&oacute; la actividad <i>in vitro</i> de diversos desinfectantes, tales como propanol, mecetronium etilsulfato, yodo-polivinilpirrolidona, triclos&aacute;n, y clorhexidina, contra cepas end&eacute;micas y espor&aacute;dicas de <i>A. baumannii</i>. Llegaron a la conclusi&oacute;n que la resistencia a los desinfectantes probablemente no es un factor importante que favorezca la propagaci&oacute;n de epidemias por <i>A. baumannii</i>, ya que todos los desinfectantes inhibieron el crecimiento de todas las cepas de <i>A. baumannii</i> cuando se usaron las concentraciones y tiempos de contacto recomendados por el fabricante. Sin embargo, con la mayor&iacute;a de los desinfectantes probados, un importante n&uacute;mero de bacterias permanec&iacute;an viables cuando los tiempos de contacto fueron inferior a 30 segundos o cuando estos fueron diluidos, como ocurre frecuentemente en la pr&aacute;ctica cl&iacute;nica. Algunas intervenciones de control de infecciones son apropiadas para prevenir y cotrolar brotes de <i>A. baumannii</i>, en forma ideal, deben realizarse estudios de casos y controles en la unidad para determinar que antibi&oacute;ticos aumentan el riesgo de aparici&oacute;n de cepas <i>A. baumannii</i> multiresistentes<sup>20</sup>, <sup>253</sup>. (Ver <a href="#f04">Figura 4</a>)</p>      <p align="center"><a name="f04"></a><img src="img/revistas/muis/v29n2/v29n2a11f4.jpg"></p>      <p align="center"><font size="3"><b><u>CONCLUSIONES</u></b></font></p>      ]]></body>
<body><![CDATA[<p align="justify"><i>Acinetobacter Baumannii</i> es un pat&oacute;geno oportunista emergente que causa gran preocupaci&oacute;n debido a su alta capacidad de resistencia a los antibi&oacute;ticos y al medio ambiente, y su amplia distribuci&oacute;n mundial. En Latinoam&eacute;rica alcanza el 5,3&#37; de todos los aislados de bacteriemias nosocomiales, en Colombia, seg&uacute;n informes del Ministerio de Salud y protecci&oacute;n social, dentro de los microorganismos multirresistentes aislados en unidades de cuidados intensivos del pa&iacute;s en el a&ntilde;o 2014, <i>A. baumannii</i> represent&oacute; el 3,1&#37;, con altos porcentajes de resistencia frente a los Carbapen&eacute;micos, siendo OXA 23 la carbapenemasa mas frecuente encontrada. Las especies de <i>Acinetobacter</i> pueden ser aisladas de objetos animados e inanimados, crecen en casi todas las muestras de suelos y agua fresca, con una alta capacidad para sobrevivir en ambientes secos, que proporciona mayor patogenicidad frente a otros agentes nosocomiales. En el medio hospitalario, estos microorganismos han sido aislados de humidificadores, equipos de ventilaci&oacute;n, hojas de laringoscopio, cortinas, piel del personal de salud, colchones, cojines y otros equipos. La proteina OmpA se considera como uno de los principales determinantes en su capacidad de virulencia conllevando a apoptosis en las celulas del hospededero. Son responsables principalmente de infeccion en ambientes asociados al cuidado de la salud, aunque se han reportado casos de infecci&oacute;n adquiridas en comunidad en regiones tropicales. Las enzimas inactivadoras de antimicrobianos son el principal mecanismo de resistencia, entre ellas encontramos &#946;-lactamasas, N-acetiltransferasas, O-nucleotidiltransferasas y O-fosfotransferasas. Los carbapen&eacute;micos a&uacute;n son considerados como agentes de elecci&oacute;n para las infecciones graves por <i>A. Baumannii</i>, con opciones terapeuticas adicionales como sulbactam, tobramicina, amikacina, tigeciclina, minociclina y doxiciclina, como &uacute;ltima linea de manejo se usa colistina, por su gran potencial de aparici&oacute;n de efectos adversos. El uso de terapia con combinaci&oacute;n de antimicrobianos para sinergia a&uacute;n es controvertida y faltan estudios adicionales para su uso genrealizado. De acuerdo al reporte del grupo GREBO sobre el perfil de resistencia antimicrobiana de <i>A. baumannii</i> en Colombia, en muchas instituciones de salud se hace necesario el uso en primera linea de polimixina asociada a tigeciclina y un carbapen&eacute;mico o amikacina segun el escenario clinico, por lo cual recomienda que cada instituci&oacute;n tome las medidas necesarias seg&uacute;n su perfil de susceptibilidad frente a este microorganismo para evitar el uso masivo de polimixinas, debido que son la &uacute;ltima opci&oacute;n terapeutica disponible para infecciones graves por &eacute;ste y otros microorganismos multirresistentes. Se encuentran en desarrollo manejos alternativos como la terapia con bacteriofagos, terapia de transferencia de genes bactericidas, radioinmunoterapia, terapia fotodinamica y terapia con tecnologia de nanoparticulas, con un futuro esperanzador. Se considera primordial el manejo de los pacientes de acuerdo a la localizaci&oacute;n de la infecci&oacute;n y el patr&oacute;n de resistencia presente en las cepas de la unidad en particular. Es importante la creaci&oacute;n de protocolos institucionales con escalones terap&eacute;uticos, considerando el sitio de la infecci&oacute;n, gravedad del paciente, sensibilidad de la cepa propia de cada instituci&oacute;n y el uso previo de antibi&oacute;ticos; se debe hacer &eacute;nfasis en los mecanismos de prevenci&oacute;n como el estricto cumplimiento en el uso de las medidas de barrera, higiene de manos, exhaustiva desinfeccion y limpieza del ambiente hospitalario, adecuado proceso de aislamiento de pacientes y uso del recurso humano, investigaciones biol&oacute;gicas moleculares y cultivos de la unidad, encaminadas a prevenir y controlar la aparici&oacute;n de este microorganismo. Se hace necesario el desarrollo de nuevos antibiticos, desafortunadamente, de acuerdo a lo expuesto por la FDA de Estados Unidos<sup>10</sup>, son pocos los avances en la creaci&oacute;n de nuevos antibi&oacute;ticos en las ultimas tres d&eacute;cadas, enfatizando en el poco inter&eacute;s mostrado por las compa&ntilde;&iacute;as farmac&eacute;uticas en el desarrollo de nuevas mol&eacute;culas debido a la poca rentabilidad que representa para ellas la inversi&oacute;n en investigaciones en esta materia, esperamos el apoyo gubernamental y de la empresa privada para continuar avanzando en el manejo eficaz para este pat&oacute;geno.</p>      <p align="center"><font size="3"><b><u>REFERENCIAS BIBLIOGR&Aacute;FICAS</u></b></font></p>      <!-- ref --><p align="justify">1. Barbier F, Andremont A, Wolff M, Bouadma L. Hospital-acquired pneumonia and ventilator-associated pneumonia: recent advances in epidemiology and managment. 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