<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932011000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sepsis: la otra cara de la respuesta inmune]]></article-title>
<article-title xml:lang="en"><![CDATA[Sepsis: the other face of immune response]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata Ospina]]></surname>
<given-names><![CDATA[Juan Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>24</volume>
<numero>2</numero>
<fpage>179</fpage>
<lpage>190</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932011000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932011000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932011000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La sepsis continúa siendo una de las principales causas de muerte alrededor del mundo a pesar de los grandes avances en su investigación. Representa un desequilibrio en los diferentes mecanismos inmunológicos responsables de neutralizar la invasión de un agente infeccioso. En este artículo se presenta una revisión sobre los conceptos fisiopatológicos de la sepsis, así como sobre las diferentes alteraciones genéticas que hacen a un individuo susceptible a desarrollarla.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Worldwide, sepsis continues to be a major cause of death, in spite of the impressive advances in its research. This condition represents an imbalance in the different immunological mechanisms responsible for neutralizing the infectious agent invasion. In this paper, a review of the physiopathological concepts of sepsis is presented, including the different genetic variations which make an individual susceptible to sepsis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Sepsis]]></kwd>
<kwd lng="es"><![CDATA[Sepsis/epidemiología]]></kwd>
<kwd lng="es"><![CDATA[Sepsis/genética]]></kwd>
<kwd lng="es"><![CDATA[Sepsis/fisiopatología]]></kwd>
<kwd lng="en"><![CDATA[Sepsis]]></kwd>
<kwd lng="en"><![CDATA[Sepsis/epidemiology]]></kwd>
<kwd lng="en"><![CDATA[Sepsis/genetics]]></kwd>
<kwd lng="en"><![CDATA[Sepsis/physiopathology]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>Sepsis: la otra cara de la respuesta inmune</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Sepsis: the other face of immune response</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>''Nuestros arsenales para destruir bacterias son tan poderosos... que corremos m&aacute;s peligro a   causa de ellos que de los invasores''</i> </font></p>     <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Thomas Lewis &#40;N Engl J Med, 1972&#41;</i></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Juan Pablo Zapata Ospina&#42;</b></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">&#42; M&eacute;dico interno, Facultad de Medicina, Universidad de Antioquia, Medell&iacute;n Colombia.   Correspondencia: <a href="mailto:juanpabloz87@gmail.com">juanpabloz87@gmail.com</a>.</font></p>     <p>&nbsp;</p>     <p align="center">&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La sepsis contin&uacute;a siendo una de las principales causas de muerte alrededor del mundo a   pesar de los grandes avances en su investigaci&oacute;n. Representa un desequilibrio en los diferentes   mecanismos inmunol&oacute;gicos responsables de neutralizar la invasi&oacute;n de un agente infeccioso.   En este art&iacute;culo se presenta una revisi&oacute;n sobre los conceptos fisiopatol&oacute;gicos de la sepsis,   as&iacute; como sobre las diferentes alteraciones gen&eacute;ticas que hacen a un individuo susceptible a   desarrollarla.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> Palabras clave</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i> Sepsis, Sepsis/epidemiolog&iacute;a, Sepsis/gen&eacute;tica, Sepsis/fisiopatolog&iacute;a</i>   </font></p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Worldwide, sepsis continues to be a major cause of death, in spite of the impressive advances   in its research. This condition represents an imbalance in the different immunological   mechanisms responsible for neutralizing the infectious agent invasion. In this paper, a review   of the physiopathological concepts of sepsis is presented, including the different genetic   variations which make an individual susceptible to sepsis.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Key words</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i> Sepsis, Sepsis/epidemiology, Sepsis/genetics, Sepsis/physiopathology</i></font> </p> <hr noshade size="1">     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"> <b>INTRODUCCI&Oacute;N</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El sistema inmune del ser humano es un arsenal   de mol&eacute;culas, c&eacute;lulas y tejidos especializados en   la defensa del cuerpo frente a elementos extra&ntilde;os,   incluidos los microorganismos. En este sentido,   un agente infeccioso que invade un hospedero   susceptible despierta en &eacute;l una gran variedad de   mecanismos inmunol&oacute;gicos, que buscan neutralizar   la invasi&oacute;n y mantener as&iacute; la homeostasis del cuerpo.   El proceso b&aacute;sico que se lleva a cabo en esta respuesta   es el de la inflamaci&oacute;n, que se inicia por las estrategias   de reconocimiento de la inmunidad innata y es, a su   vez, el evento iniciador de la inmunidad adaptativa   &#40;1&#41;. Sin embargo, si esta respuesta inmune no se   controla y llega a desarrollarse de manera exagerada   y generalizada, produce diversas alteraciones que   pueden representar incluso un riesgo para la vida   del hospedero &#40;2&#41;. Esta respuesta sist&eacute;mica recibe   el nombre de sepsis y representa la otra cara de la   respuesta inmune al dejar de ser un mecanismo   ben&eacute;fico y convertirse en s&iacute; misma en una condici&oacute;n   delet&eacute;rea. En este art&iacute;culo se revisar&aacute;n los aspectos   inmunol&oacute;gicos de la fisiopatolog&iacute;a de la sepsis,   espec&iacute;ficamente los relacionados con la inflamaci&oacute;n   y la predisposici&oacute;n gen&eacute;tica.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>MATERIALES Y M&Eacute;TODOS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Se hizo una b&uacute;squeda en las bases de datos <i>Pubmed,   OVID, Scielo, SpringerLink y Wiley InterScience</i> con   los t&eacute;rminos <i>MeSH</i>: sepsis, <i>Systemic Inflammatory     Response Syndrome, epidemiology, physiopathology,     treatment</i> y se hicieron combinaciones de t&eacute;rminos.   Los resultados se restringieron a la bibliograf&iacute;a con   res&uacute;menes publicada en los &uacute;ltimos 10 a&ntilde;os. Tambi&eacute;n   se revis&oacute; la bibliograf&iacute;a de los art&iacute;culos encontrados. En   el sitio web de la FDA <I>&#40;Food and Drug Administration&#41;</I> se busc&oacute; informaci&oacute;n relacionada con la drotrecogina   alfa activada.   </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>DEFINICIONES</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La conferencia del Colegio Americano de M&eacute;dicos   del T&oacute;rax <i>&#40;American College of Chest Physicians&#41;</i> y   la Sociedad de Medicina de Cuidado Cr&iacute;tico <i>&#40;Society     of Critical Care Medicine&#41;</i>, reunida en Chicago en   1991, permiti&oacute; estandarizar algunas definiciones y   criterios que posibilitan el diagn&oacute;stico de sepsis y la   instauraci&oacute;n de un tratamiento adecuado &#40;3&#41;. Estas   nociones traducen conceptualmente la pl&eacute;tora de   fen&oacute;menos inmunol&oacute;gicos sist&eacute;micos que ocurren en   el organismo. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Infecci&oacute;n:</i> fen&oacute;meno microbiol&oacute;gico caracterizado   por una respuesta inflamatoria a la presencia de   microorganismos en un tejido normalmente est&eacute;ril.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <i>Bacteriemia:</i> presencia de bacterias viables en la   sangre.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <i>S&iacute;ndrome de respuesta inflamatoria sist&eacute;mica</i> &#40;SRIS&#41;: respuesta inflamatoria producida por   diversos est&iacute;mulos infecciosos y no infecciosos &#40;como   quemaduras, traumas y pancreatitis&#41;, que se manifiesta   por la presencia de dos o m&aacute;s de los siguientes criterios: </font></p> <ol>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Temperatura mayor de 38 &#176;C o menor de 36 &#176;C.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Frecuencia card&iacute;aca mayor de 90 latidos por     minuto.   </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Frecuencia respiratoria mayor de 20     respiraciones por minuto o PaCO2 menor de     32 mm Hg.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Leucocitos por encima de 12.000 o por debajo     de 4.000/&#181;L; o bien, m&aacute;s de 10&#37; de formas     inmaduras &#40;bandas&#41;.   </font></li>     ]]></body>
<body><![CDATA[</ol>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Sepsis: SRIS que se desarrolla en respuesta a una   infecci&oacute;n. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Sepsis grave: sepsis asociada con disfunci&oacute;n aguda   de &oacute;rganos, hipoperfusi&oacute;n o hipotensi&oacute;n. Se habla de <i>sepsis grave de alto riesgo</i> cuando se asocia a falla de   dos o m&aacute;s &oacute;rganos.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <i>Choque s&eacute;ptico:</i> hipotensi&oacute;n &#40;definida como presi&oacute;n   arterial sist&oacute;lica &#91;PAS&#93; menor de 90 mm Hg o una ca&iacute;da   de la PAS de 40 o m&aacute;s mm Hg&#41; inducida por la sepsis,   que persiste a pesar de la administraci&oacute;n de l&iacute;quidos   y se acompa&ntilde;a de alteraciones en la perfusi&oacute;n tisular,   tales como acidosis metab&oacute;lica, oliguria o alteraciones   del estado mental. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>S&iacute;ndrome de disfunci&oacute;n org&aacute;nica m&uacute;ltiple</i> &#40;SDOM&#41;:   conjunto de alteraciones en la funci&oacute;n de &oacute;rganos   que se presenta en pacientes cr&iacute;ticamente enfermos   y que requiere intervenci&oacute;n m&eacute;dica para mantener   la homeostasis.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> EPIDEMIOLOG&Iacute;A</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los estudios sobre la epidemiolog&iacute;a de la sepsis   presentan limitaciones y gran variabilidad de datos   y de dise&ntilde;os. No obstante, ha quedado claro que   la incidencia de esta condici&oacute;n ha aumentado   vertiginosamente durante los &uacute;ltimos a&ntilde;os &#40;4,5&#41;. Este   hecho podr&iacute;a explicarse por la mayor proporci&oacute;n   de pacientes de la tercera edad, el mayor n&uacute;mero   de personas inmunosuprimidas, el aumento de la   resistencia microbiana y el uso m&aacute;s frecuente de   procedimientos invasivos &#40;4,6&#41;. La incidencia mundial   de la sepsis se ha calculado en 18 millones de casos por   a&ntilde;o &#40;7&#41;. En Estados Unidos se presentan 750.000 casos   anuales y la tasa de mortalidad var&iacute;a entre 28&#37; y 50&#37; &#40;8&#41;   y es la d&eacute;cima causa de muerte &#40;6&#41;. Las proyecciones   sobre la incidencia han calculado aumentos de 1,5&#37;   al a&ntilde;o. En los adultos la incidencia y la mortalidad   aumentan con la edad &#40;9&#41;; los hombres tienen 30&#37;   m&aacute;s riesgo de desarrollar sepsis que las mujeres y la   incidencia es mayor en personas de raza negra &#40;10&#41;. La   sepsis es una de las principales causas de mortalidad   en pacientes pedi&aacute;tricos &#40;11&#41;; la incidencia de sepsis   neonatal, de acuerdo con los datos de la NNPD &#40;por   la sigla en ingl&eacute;s de <i>National Neonatal Perinatal     Database</i>&#41; es de 30/1.000 nacidos vivos y quienes tienen   mayor riesgo son aquellos con bajo peso al nacer &#40;12&#41;.   La sepsis y sus condiciones asociadas tienen gran   impacto sobre la econom&iacute;a: por cada caso, los costos   m&eacute;dicos son de aproximadamente US&#36;22.100, con   un total de &#36;16.7 billones anuales en Estados Unidos   &#40;7&#41; y 0,42 a 0,49 billones de euros en el Reino Unido   &#40;8&#41;. En Am&eacute;rica Latina, la literatura sobre sepsis refleja   la ausencia de un consenso sobre las definiciones   cl&iacute;nicas, lo que dificulta hacer estudios apropiados   para medir la magnitud del problema&#40;13&#41;. Sin   embargo, la heterogeneidad de los datos de incidencia   y mortalidad sugiere que la situaci&oacute;n de la sepsis en   Am&eacute;rica Latina podr&iacute;a ser peor que la de los pa&iacute;ses   desarrollados &#40;13,14&#41;. Con respecto al microorganismo,   una gran parte de los casos de sepsis la causan   bacterias gramnegativas, principalmente <i>Escherichia     coli, Klebsiella spp y Pseudomonas aeruginosa</i> &#40;15&#41;.   Sin embargo, desde 1980 se ha observado un aumento   en la incidencia de sepsis por bacterias grampositivas,   como <i>Streptococcus pneumoniae y Staphylococcus     aureus</i>, as&iacute; como por hongos, especialmente por   especies de <i>Candida y Aspergillus</i> &#40;16&#41;.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>FISIOPATOLOG&Iacute;A</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El desarrollo de la sepsis est&aacute; determinado por las   caracter&iacute;sticas del hospedero y por los factores   intr&iacute;nsecos del pat&oacute;geno &#40;17&#41;. Hasta ahora, la   teor&iacute;a m&aacute;s aceptada sobre la fisiopatolog&iacute;a de la   sepsis sostiene que esta representa una respuesta   inflamatoria amplificada que sobrepasa los   mecanismos de regulaci&oacute;n negativa &#40;18&#41;. No obstante,   se ha propuesto que en la sepsis realmente subyace un   estado de inmunosupresi&oacute;n &#40;19&#41;. El evento iniciador   de la respuesta inflamatoria es el reconocimiento   de los componentes estructurales o de las toxinas   del agente infeccioso por el sistema inmune del   hospedero, que conduce a la secreci&oacute;n de un gran   n&uacute;mero de mediadores que funcionan de forma   autocrina, paracrina y endocrina, para activar las v&iacute;as   de la inflamaci&oacute;n y la coagulaci&oacute;n &#40;20&#41;. El resultado   de esta activaci&oacute;n son los efectos biol&oacute;gicos, que se   traducen en las manifestaciones cl&iacute;nicas observadas   en los pacientes s&eacute;pticos. A continuaci&oacute;n se describen   los diferentes procesos inmunol&oacute;gicos que ocurren   durante la infecci&oacute;n y que conducen a la sepsis.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Reconocimiento y activaci&oacute;n</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La sepsis generalmente se inicia con la diseminaci&oacute;n   de microorganismos responsables de una infecci&oacute;n   local, generalmente en la piel o en los tractos   digestivo, respiratorio o genitourinario, o bien son   introducidos directamente en la circulaci&oacute;n por   cat&eacute;teres intravasculares &#40;20&#41;. Los componentes   estructurales del microorganismo expresan <i>rearreglos</i> moleculares altamente conservados, conocidos como   PAMP &#40;por la sigla en ingl&eacute;s de <i>pathogen associated     molecular patterns</i>&#41;, que cumplen funciones vitales y   son exclusivos del metabolismo microbiano. Algunos   de los m&aacute;s conocidos son: el lipopolisac&aacute;rido &#40;LPS&#41; de   las bacterias gramnegativas, el peptidoglicano &#40;PGN&#41;   y el &aacute;cido lipoteicoico &#40;LTA&#41; de las grampositivas, el   lipoarabinoman&aacute;n de las micobacterias, el zimos&aacute;n de la   pared de las levaduras, el ADN bacteriano hipometilado   rico en secuencias espec&iacute;ficas que contiene los   dinucle&oacute;tidos citosina y guanina en forma no metilada   &#40;motivos CpG&#41;, el ARN viral de cadena simple o doble y   la flagelina de las bacterias flageladas &#40;21&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por su parte, el hospedero normal reconoce estas   caracter&iacute;sticas moleculares por medio de los receptores de reconocimiento de PAMP &#40;PRR, por la sigla en   ingl&eacute;s de <i>pathogen recognition receptors</i>&#41;, presentes   de manera soluble y en la superficie de c&eacute;lulas de la   inmunidad innata. Los receptores tipo Toll &#40;TLR, por la   sigla en ingl&eacute;s de <i>toll-like receptors</i>&#41; son hasta ahora los   PRR mejor caracterizados. Se trata de glicoprote&iacute;nas   transmembranales con un dominio extracelular,   responsable del reconocimiento de PAMP y que   contiene motivos ricos en leucina, y otro intracelular,   hom&oacute;logo del dominio intracelular del receptor de   la interleucina &#40;IL&#41;-1, denominado dominio TIR &#40;por   la sigla en ingl&eacute;s de <i>toll/interleukin-1 receptor</i>. Hasta   ahora se han descrito 10 TLR en humanos, presentes   en la superficie celular &#40;TLR1, TLR2, TLR4-TLR6, TLR11&#41;   y en algunos compartimientos intracelulares, como   los endosomas y los lisosomas &#40;TLR3, TLR7-TLR9&#41;   &#40;22&#41;. Los macr&oacute;fagos, las c&eacute;lulas dendr&iacute;ticas &#40;CD&#41;, los   neutr&oacute;filos, los linfocitos B, las c&eacute;lulas endoteliales   y algunas epiteliales y las plaquetas expresan TLR   &#40;23&#41;. El amplio rango de ligandos de estos receptores   incluye l&iacute;pidos modificados &#40;LPS&#41;, prote&iacute;nas   &#40;flagelina&#41; y &aacute;cidos nucleicos. Al ponerse en contacto   directo con su ligando, los TLR se activan e inician la   transducci&oacute;n de se&ntilde;ales intracelulares por dos v&iacute;as: la   una dependiente del factor de diferenciaci&oacute;n mieloide   de 88 kd &#40;MyD88&#41;, que utiliza la mayor&iacute;a de los TLR, y   la otra, independiente de MyD88 y dependiente de la   prote&iacute;na adaptadora asociada al dominio TIR inductora   de interfer&oacute;n-&beta; &#40;TRIF, por la sigla en ingl&eacute;s de <i>TIR     domain-containing adapter-inducing interferon- &beta;</i>&#41;,   exclusiva de TLR3 y TLR4. La primera de estas v&iacute;as se   inicia con la modificaci&oacute;n del dominio intracelular del   TLR, que activa a la prote&iacute;na MyD88; esto conduce a la   activaci&oacute;n de otras mol&eacute;culas de se&ntilde;alizaci&oacute;n como   las prote&iacute;nas de la familia de las cinasas asociadas al   receptor de IL-1 &#40;IRAK, por la sigla en ingl&eacute;s de <i>IL-1Rassociated     kinase</i>&#41; y del factor 6 asociado al receptor   del factor de necrosis tumoral -TNF- &#40;TRAF-6, por   la sigla en ingl&eacute;s de <i>tumor necrosis factor receptor     associated factor-6</i>&#41;. El resultado es la activaci&oacute;n de las   prote&iacute;nas cinasas activadas por mit&oacute;genos &#40;MAPK, por   la sigla en ingl&eacute;s de <i>mitogen-activated protein kinases</i>&#41;   y de varios factores de transcripci&oacute;n, como AP-1 y NF-   &kappa;B, que regulan la expresi&oacute;n de genes que codifican   para las citocinas con propiedades proinflamatorias   IL-1&beta;, IL-6 y TNF-&alpha;. TLR2 y TLR4 utilizan una segunda   prote&iacute;na adaptadora en la v&iacute;a dependiente de MyD88   conocida como prote&iacute;na adaptadora con dominio   TIR &#40;TIRAP, por la sigla en ingl&eacute;s de <i>toll-interleukin 1     receptor domain containing adaptor protein</i>&#41;. En la v&iacute;a   independiente de MyD88, las mol&eacute;culas TRIF y TRAM   &#40;mol&eacute;cula adaptadora relacionada con TRIF, por la   sigla en ingl&eacute;s de <i>trif-related adaptor molecule</i>&#41; sirven   de mol&eacute;culas adaptadoras que reclutan y activan la   cinasa TBK-1 &#40;cinasa de uni&oacute;n a TANK, activador de   Nf-&kappa;B por las siglas en ingl&eacute;s de <i>tank-binding kinase   &#91;TBK-1&#93; y TRAF family member-associated Nf-&kappa;B     activator &#91;TANK&#93;</i>&#41; para la posterior activaci&oacute;n de IRF3   &#40;factor regulador de interfer&oacute;n &#8211;IFN- 3, por la sigla   en ingl&eacute;s de <i>interferon regulatory factor 3</i>&#41;, el cual   se desplaza al n&uacute;cleo e induce la transcripci&oacute;n de   genes responsables de la producci&oacute;n de IFN tipo I y de   mol&eacute;culas coestimuladoras. En pacientes con sepsis se   ha comprobado un aumento en los niveles de TLR2   y TLR4 en la membrana de los monocitos, as&iacute; como   varias alteraciones gen&eacute;ticas en estos dos receptores,   lo que sugiere una relaci&oacute;n compleja y hasta ahora   poco clara entre el proceso de reconocimiento y la   sepsis &#40;24&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Existen otros PRR, como las prote&iacute;nas de la familia   NOD &#40;por la sigla en ingl&eacute;s de <i>nucleotide-binding     oligomerization domain</i>&#41; y la prote&iacute;na RIG-1 &#40;por la   sigla en ingl&eacute;s de <i>Ras-related inhibitor of cell growth</i>&#41;,   encargados del reconocimiento intracelular de PAMP,   los receptores de lectina y los de peptidoglicano   &#40;PGRP, por la sigla en ingl&eacute;s de <i>peptidoglycan     receptor protein</i>&#41; y varias mol&eacute;culas de diferenciaci&oacute;n   leucocitaria, como CD13 y CD14 &#40;25&#41;. Otros   mecanismos de reconocimiento de la inmunidad   innata incluyen el sistema del complemento, las   defensinas y las catelicidinas &#40;17&#41;. El complejo   mayor de histocompatibilidad clase II &#40;CMH-II&#41; en las   c&eacute;lulas presentadores de ant&iacute;genos &#40;CPA&#41;, as&iacute; como   las cadenas V&beta; del receptor de linfocitos T &#40;TCR,   por la sigla en ingl&eacute;s de <i>t-cell receptor</i>&#41; pueden ligar   superant&iacute;genos y desencadenar la producci&oacute;n masiva   de citocinas proinflamatorias. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Respuesta inflamatoria</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Con la activaci&oacute;n de los PRR se libera una gran   cantidad de mediadores que conducen a activar   directamente las c&eacute;lulas de la inmunidad innata y a   inducir la respuesta inmune adquirida mediante la   maduraci&oacute;n de las CD y la modulaci&oacute;n de la respuesta   de los linfocitos T &#40;LT&#41; CD4&#43; hacia Th1 &#40;17&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Citocinas:</b> son prote&iacute;nas que median un gran n&uacute;mero   de funciones en diferentes grupos celulares. Los   fagocitos mononucleares son una de las principales   fuentes de citocinas proinflamatorias una que vez han   reconocido los PAMP. A continuaci&oacute;n se describen las   principales citocinas inflamatorias involucradas en la   sepsis.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b><i>Factor de necrosis tumoral alfa &#40;TNF-&alpha;&#41;:</i></b> lo producen   los neutr&oacute;filos, LT, c&eacute;lulas endoteliales, mastocitos   y c&eacute;lulas asesinas naturales &#40;NK&#41;. La administraci&oacute;n   de esta citocina a animales de experimentaci&oacute;n no   infectados puede inducir las alteraciones patol&oacute;gicas   observadas en la sepsis &#40;26&#41;. Los est&iacute;mulos para   la liberaci&oacute;n de este mediador incluyen los PAMP,   la fracci&oacute;n C5a del complemento, la IL-1 y el   mismo TNF-&alpha;. Este produce fiebre, aumenta la   concentraci&oacute;n de catecolaminas, activa neutr&oacute;filos,   c&eacute;lulas endoteliales, monocitos y macr&oacute;fagos, induce   actividad procoagulante y estimula la liberaci&oacute;n de   otras citocinas, mediadores lip&iacute;dicos y factores de   crecimiento &#40;27&#41;. El nivel plasm&aacute;tico de esta citocina   aumenta tempranamente durante la sepsis, pero   disminuye despu&eacute;s de algunas horas &#40;20&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b><i>Interleucina-1 beta &#40;IL-1 &beta;&#41;:</i></b> su amplio rango de   efectos biol&oacute;gicos incluye: activaci&oacute;n de linfocitos B   &#40;LB&#41; y LT, c&eacute;lulas NK, c&eacute;lulas endoteliales, neutr&oacute;filos   y osteoclastos; induce la secreci&oacute;n de otras citocinas,   factores de crecimiento y catecolaminas; estimulaci&oacute;n   del catabolismo, que lleva a hipertrigliceridemia;   aumento de la temperatura corporal y, en dosis altas,   puede causar hipotensi&oacute;n, leucopenia, congesti&oacute;n   pulmonar e incluso la muerte &#40;28&#41;. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b><i>Interleucina-6 &#40;IL-6&#41;:</i></b> si bien no induce por s&iacute; sola las   caracter&iacute;sticas del SRIS, es un marcador importante   de inflamaci&oacute;n pues, a diferencia del TNF-&alpha;, su   concentraci&oacute;n plasm&aacute;tica se mantiene alta en el   tiempo &#40;29&#41;. La liberan monocitos, macr&oacute;fagos,   c&eacute;lulas endoteliales, astrocitos, fibroblastos, LT y LB.   Conduce a la producci&oacute;n hep&aacute;tica de reactantes de   fase aguda e interviene en la diferenciaci&oacute;n de los LB,   la activaci&oacute;n de los LT y la liberaci&oacute;n del factor tisular   &#40;FT&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b><i>Interleucina-12 &#40;IL-12&#41;:</i></b> participa en el establecimiento   de la respuesta Th1 y en la producci&oacute;n de IFN-&gamma; por   los LT y las c&eacute;lulas NK. Tambi&eacute;n se la ha relacionado   con hepatomegalia y esplenomegalia, leucopenia   y anemia &#40;27&#41;. En el choque s&eacute;ptico por <i>Neisseria     meningitidis </i>el nivel plasm&aacute;tico de IL-12 se relaciona   con el pron&oacute;stico y la gravedad de la enfermedad &#40;30&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b><i>Interfer&oacute;n gamma &#40;IFN-&gamma;&#41;:</i></b> en los estadios iniciales   de la inflamaci&oacute;n, las c&eacute;lulas NK producen IFN-&gamma; y, a   medida que se desarrolla la respuesta inmune, los LT   CD4&#43; Th1 se convierten en la principal fuente de este   mediador. La combinaci&oacute;n de TNF-&alpha; e IFN-&gamma; conduce   a una activaci&oacute;n &oacute;ptima de los macr&oacute;fagos, que los   convierte en c&eacute;lulas microbicidas potentes. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b><i>Factor inhibidor de la migraci&oacute;n de macr&oacute;fagos   &#40;MIF&#41;:</i></b> lo secretan las c&eacute;lulas epiteliales pulmonares   y renales, los macr&oacute;fagos y los eosin&oacute;filos tras   la exposici&oacute;n a citocinas proinflamatorias y a   PAMP. Esta sustancia estimula la secreci&oacute;n de   citocinas proinflamatorias, de &oacute;xido n&iacute;trico &#40;NO&#41;   y de mediadores lip&iacute;dicos. Se lo ha considerado un   predictor importante del pron&oacute;stico de los pacientes   s&eacute;pticos, pues el aumento de su concentraci&oacute;n   plasm&aacute;tica se relaciona con manifestaciones cl&iacute;nicas   graves y mortalidad precoz &#40;31&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b><i>Quimiocinas:</i></b> cumplen un papel importante   durante la inflamaci&oacute;n, porque facilitan la migraci&oacute;n   leucocitaria y median otros procesos como la   angiog&eacute;nesis y la degranulaci&oacute;n de leucocitos. La   interleucina-8 &#40;IL-8&#41; es una quimiocina liberada   por monocitos, macr&oacute;fagos, neutr&oacute;filos, c&eacute;lulas   endoteliales y epiteliales estimuladas por PAMP,   TNF-&alpha; o IL-1, cuyos principales efectos son la   quimiotaxis y la activaci&oacute;n de los neutr&oacute;filos. La   prote&iacute;na quimioatrayente de monocitos-1 &#40;MCP-1,   por la sigla en ingl&eacute;s de <i>monocyte chemoattractant-1     protein</i>&#41; es otra quimiocina importante en sepsis por   su potente acci&oacute;n quimioatrayente sobre las c&eacute;lulas   mononucleares. Varios estudios demuestran que las   concentraciones de estas quimiocinas se relacionan   con la gravedad y el pron&oacute;stico de la sepsis, por lo que   podr&iacute;an considerarse &uacute;tiles en el diagn&oacute;stico &#40;32,33&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> Sistema del complemento.</b> La activaci&oacute;n del   complemento por las diferentes v&iacute;as lleva a la   formaci&oacute;n de las anafilotoxinas C3a, C4a y C5a que   incrementan la permeabilidad vascular e inducen   en los mastocitos y los bas&oacute;filos la liberaci&oacute;n de   histamina, TNF-&alpha;, PAF &#40;factor activador de plaquetas,   por la sigla en ingl&eacute;s de <i>platelet-activating factor</i>&#41;,   prostaglandinas y leucotrienos &#40;29&#41;. Adem&aacute;s, C5a es un factor quimiot&aacute;ctico potente para c&eacute;lulas   inflamatorias. Las anafilotoxinas tambi&eacute;n pueden   formarse por la acci&oacute;n de la calicre&iacute;na, la elastasa,   la trombina y la plasmina, que pueden fraccionar a   C3 y C5. Durante la sepsis, el complemento es uno   de los principales mediadores del da&ntilde;o tisular. En los   casos fulminantes por <i>Neisseria meningitidis</i> se ha   evidenciado una activaci&oacute;n excesiva de este sistema   &#40;30&#41;. En modelos animales, la neutralizaci&oacute;n con   anticuerpos del receptor para la fracci&oacute;n C5a protege   de la muerte por sepsis &#40;34&#41;. Tambi&eacute;n se han utilizado   inhibidores de C1q, de la lectina ligadora de manosa   &#40;MBL, por la sigla en ingl&eacute;s de <i>mannose-binding lectin</i>&#41;   y de factor D con resultados promisorios, aunque su   aplicaci&oacute;n en humanos a&uacute;n es incipiente &#40;35&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> Mediadores lip&iacute;dicos</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los diversos est&iacute;mulos inflamatorios conducen a la   activaci&oacute;n de la enzima citoplasm&aacute;tica fosfolipasa   A2 &#40;PLA-2, por la sigla en ingl&eacute;s de <i>phospholipase-     A2</i>&#41;, que cataliza la hidr&oacute;lisis de los fosfol&iacute;pidos de   la cara interna de la membrana celular liberando   &aacute;cido araquid&oacute;nico &#40;ARA, por la sigla en ingl&eacute;s de <i>arachidonic acid</i>&#41;, que puede ser metabolizado por   la cicloxigenasa, produciendo prostaglandinas &#40;PG&#41;,   tromboxanos &#40;TX&#41; y prostaciclina, o por la lipoxigenasa,   generando leucotrienos. Durante la inflamaci&oacute;n,   las principales fuentes de prostaglandinas son las   plaquetas, los macr&oacute;fagos, las c&eacute;lulas endoteliales   y los mastocitos; los leucotrienos son producidos   esencialmente por los mastocitos, los neutr&oacute;filos y   los macr&oacute;fagos &#40;36&#41;. Durante la sepsis se ha visto un   aumento en la actividad de la PLA-2 en los neutr&oacute;filos   &#40;37&#41; y en la concentraci&oacute;n de TX y prostaciclina &#40;38&#41;.   Se han utilizado los inhibidores de la cicloxigenasa,   como el ibuprofeno, en pacientes s&eacute;pticos y, si bien   han disminuido los niveles de TX y prostaciclina, no   han demostrado mejor&iacute;a en el pron&oacute;stico ni en la   mortalidad &#40;39&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Radicales libres</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Son &aacute;tomos o mol&eacute;culas con un electr&oacute;n   desapareado lo que les confiere gran inestabilidad   y alta reactividad, que los convierten en t&oacute;xicos.   Las c&eacute;lulas fagoc&iacute;ticas producen las especies   reactivas del ox&iacute;geno &#40;ROS, por la sigla en ingl&eacute;s   de <i>reactive oxygen species</i>&#41; y del nitr&oacute;geno &#40;RNS,   por la sigla en ingl&eacute;s de <i>reactive nitrogen species</i>&#41;   que juegan un papel importante en la destrucci&oacute;n   de los agentes infecciosos. Durante la sepsis se   encuentran aumentadas las concentraciones de   estos dos tipos de sustancias y representan un riesgo   para el hospedero, pues tienen relaci&oacute;n con el da&ntilde;o   celular y tisular &#40;40&#41;. Se han utilizado inhibidores   de los radicales libres &#40;antioxidantes&#41; que han   mostrado resultados promisorios. Uno de ellos   es la deferoxamina, un quelante del hierro, cuya   administraci&oacute;n ha aumentado significativamente la   tasa de supervivencia de animales con sepsis &#40;41&#41;. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>&Oacute;xido n&iacute;trico &#40;NO&#41;</i>. Es un RNS que se produce a   partir del amino&aacute;cido L-arginina, gracias a la acci&oacute;n   de las enzimas &oacute;xido n&iacute;trico-sintasas &#40;NOS, por la   sigla en ingl&eacute;s de <i>nitric oxide synthases</i>&#41;. Existen tres   tipos de NOS: I o neuronal &#40;n-NOS&#41;, II o inducible   &#40;iNOS&#41; y III o endotelial &#40;eNOS&#41;. La n-NOS y la eNOS   se expresan permanentemente, por lo que se llaman   NOS constitutivas, y se encargan de regular el tono   vascular produciendo peque&ntilde;as cantidades de NO. En   cambio, la iNOS solo se activa durante la inflamaci&oacute;n,   gracias a la estimulaci&oacute;n que producen el LPS, la IL-1,   el TNF-&alpha; y el IFN-&gamma;, y genera NO en gran cantidad y   por un per&iacute;odo prolongado. En la sepsis, las principales   fuentes de NO &#40;inducible&#41; son los neutr&oacute;filos&#40;41&#41; y   las c&eacute;lulas endoteliales &#40;42&#41;. El NO contribuye a la   hipotensi&oacute;n caracter&iacute;stica del choque s&eacute;ptico, porque   altera la contractilidad vascular con lo que favorece   la vasodilataci&oacute;n e induce la disfunci&oacute;n mioc&aacute;rdica.   Cuando se encuentra en concentraci&oacute;n alta, el NO   reacciona con el O<sub>2</sub> - y forma peroxinitrito, un producto   t&oacute;xico que causa da&ntilde;o tisular. La terapia con inhibidores   selectivos y no selectivos de NOS ha mostrado que   mejora los par&aacute;metros hemodin&aacute;micos de los pacientes   s&eacute;pticos pero ha aumentado significativamente la   tasa de mortalidad &#40;43,44&#41;; ello sugiere que, adem&aacute;s   de ser delet&eacute;reo, el NO tiene alg&uacute;n papel protector,   posiblemente como inmunomodulador. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Activaci&oacute;n de la coagulaci&oacute;n</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El desarrollo de coagulaci&oacute;n intravascular   diseminada &#40;CID&#41; es com&uacute;n en los pacientes con   sepsis, con una prevalencia que oscila entre 16&#37;   y 38&#37; &#40;20&#41;. La CID se caracteriza por la activaci&oacute;n   sist&eacute;mica de la coagulaci&oacute;n, que lleva a la formaci&oacute;n   intravascular de fibrina y a la disminuci&oacute;n de las plaquetas y de factores de la coagulaci&oacute;n; como   resultado se producen trombos que pueden ocluir los   vasos sangu&iacute;neos, dificultando en &uacute;ltima instancia   el aporte de ox&iacute;geno a las c&eacute;lulas y promoviendo   el desarrollo de la disfunci&oacute;n org&aacute;nica. Con el   tiempo tambi&eacute;n se producen hemorragias graves   que resultan del consumo masivo y subsecuente   agotamiento de los factores de la coagulaci&oacute;n y de   las plaquetas. Durante la sepsis, los neutr&oacute;filos, las   c&eacute;lulas endoteliales y especialmente los monocitos   activados producen grandes cantidades de factor   tisular &#40;FT&#41;, activando la coagulaci&oacute;n por la v&iacute;a   extr&iacute;nseca &#40;45&#41;. Adem&aacute;s, se encuentran alteradas   la actividad y la concentraci&oacute;n de las prote&iacute;nas   anticoagulantes antitrombina &#40;AT&#41;, inhibidor de la   v&iacute;a del TF &#40;TFPI, <i>tissue factor pathway inhibitor</i>&#41; y   prote&iacute;na C reactiva &#40;PCR&#41;. Con respecto al sistema   fibrinol&iacute;tico, el TNF-&alpha; y la IL-1 estimulan la liberaci&oacute;n   del activador tisular del plasmin&oacute;geno &#40;TPA, por la   sigla en ingl&eacute;s de <i>tissue plasminogen activator</i>&#41; y del   activador del plasmin&oacute;geno similar a urocinasa &#40;UPA,   por la sigla en ingl&eacute;s de <i>urokinase-like plasminogen     activator</i>&#41;, que activan el plasmin&oacute;geno y degradan   la fibrina &#40;45&#41;. Sin embargo, este aumento de la   actividad fibrinol&iacute;tica se contrarresta con las grandes   concentraciones de los inhibidores de la fibrin&oacute;lisis   -como el inhibidor del activador de plasmin&oacute;geno   tipo 1 &#40;PAI-1, por la sigla en ingl&eacute;s de <i>plasminogen     activator inhibitor-1</i>&#41; y el factor inhibidor activable   de trombina &#40;TAFI, por la sigla en ingl&eacute;s de <i>thrombin     activatable fibrinolysis inhibitor</i>&#41; - t&iacute;picas de la sepsis   grave y que tambi&eacute;n son resultado de la acci&oacute;n de   las citocinas proinflamatorias &#40;20&#41;. La PCR humana   recombinante &#40;drotrecogin alfa activada&#41; fue el   primer anticoagulante que demostr&oacute; ser eficaz en el   tratamiento de la sepsis grave. El estudio desarrollado   por el grupo PROWESS &#40;por la sigla en ingl&eacute;s de <i>Recombinant Human Activated Protein C Worldwide     Evaluation in Severe Sepsis</i>&#41; evidenci&oacute; que la   infusi&oacute;n intravenosa de drotrecogin alfa activada   produce una disminuci&oacute;n del 19,4&#37; del riesgo   relativo de muerte &#40;46&#41;. Con base en estos resultados,   la Administraci&oacute;n de Drogas y Alimentos de los   Estados Unidos &#40;FDA, por la sigla en ingl&eacute;s de <i>Food     and Drug Administration</i>&#41; aprob&oacute; en 2001 el uso de   este agente para el tratamiento de los pacientes con   sepsis grave con alto riesgo de muerte &#40;47&#41;. Tambi&eacute;n   se ha investigado ampliamente la antitrombina   &#40;AT&#41; recombinante y purificada. Su administraci&oacute;n   a dosis altas en animales &#40;48,49&#41; y humanos &#40;50,51&#41;   con sepsis grave &#40;sin el uso concomitante de   heparina&#41; ha incrementado significativamente la   tasa de supervivencia; sin embargo, estos estudios   no permiten establecer con claridad un uso est&aacute;ndar   de la AT en la pr&aacute;ctica cl&iacute;nica. Estudios iniciales con   TFPI recombinante &#40;tifacogin&#41; mostraron beneficios   en el tratamiento de la sepsis y de la sepsis grave; no   obstante, resultados posteriores dejaron en claro que   su administraci&oacute;n no reduce la tasa de mortalidad   y que adem&aacute;s favorece la aparici&oacute;n de hemorragias   &#40;52&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Cascada antinflamatoria</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Durante la sepsis, el proceso inflamatorio es   seguido de una respuesta antinflamatoria, conocida   como s&iacute;ndrome de respuesta antinflamatoria   compensadora &#40;CARS, por la sigla en ingl&eacute;s de <i>compensatory antiinflammatory response syndrome</i>&#41;   o inmunopar&aacute;lisis &#40;19&#41;. En esta respuesta se   produce la liberaci&oacute;n de citocinas con propiedades   antinflamatorias, como IL-4, IL-10 e IL-13, el   antagonista del receptor de la IL-1 &#40;IL-1ra&#41; y el factor   transformante de crecimiento beta &#40;TGF-&beta;, por la sigla   en ingl&eacute;s de <i>transforming growth factor beta</i>&#41;. Estos   agentes, en general, buscan suprimir la expresi&oacute;n   de los genes para la IL-1, el TNF-&alpha; y otras citocinas   inflamatorias, inhibir la presentaci&oacute;n antig&eacute;nica y   disminuir la producci&oacute;n de ROS. Durante la CARS,   los monocitos pueden perder su capacidad de montar   la respuesta inflamatoria &#40;desactivaci&oacute;n&#41;, los LT   pueden estar en un estado de anergia y diversos tipos   celulares, incluyendo las c&eacute;lulas endoteliales pueden   sufrir apoptosis &#40;53&#41;. Diversos estudios experimentales   y cl&iacute;nicos han comprobado que la intensidad de esta   fase se correlaciona con el pron&oacute;stico de la sepsis   &#40;54,55&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Susceptibilidad gen&eacute;tica en sepsis</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Actualmente se han asociado diversas alteraciones   gen&eacute;ticas con el desarrollo de sepsis y sus   complicaciones, fundamentalmente mediante la   comparaci&oacute;n de pacientes s&eacute;pticos con individuos   controles, con el fin de detectar diferencias que   lleven a la determinaci&oacute;n de genes candidatos &#40;<a href="img/revistas/iat/v24n2/v24n2a7t1.jpg" target="_blank">tabla   n.&#176; 1</a>&#41;. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUSIONES</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La sepsis es una condici&oacute;n cuya frecuencia ha   aumentado significativamente en las &uacute;ltimas   d&eacute;cadas, y que sigue siendo un problema de altas   morbilidad y mortalidad. Esto ha impulsado m&uacute;ltiples   esfuerzos por tratar de conocer a fondo sus bases   fisiopatol&oacute;gicas; los conocimientos hasta ahora   adquiridos muestran que se trata de una enfermedad   extremadamente compleja, en la que intervienen   muchos sistemas y cuya base gen&eacute;tica se hace cada   vez m&aacute;s evidente. Con esto se abren las posibilidades   de nuevas investigaciones con el fin de lograr una   intervenci&oacute;n eficaz mediante la implementaci&oacute;n de   pruebas diagn&oacute;sticas precoces y de un esquema de   tratamiento efectivo que permitan mirar con mayor   tranquilidad la otra cara del sistema inmune.   </font></p>     ]]></body>
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<article-title xml:lang="en"><![CDATA[A CXCL2 polymorphism is associated with better outcomes in patients with severe sepsis]]></article-title>
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<month> O</month>
<day>ct</day>
<volume>35</volume>
<numero>10</numero>
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</article>
