<?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>0016-3503</journal-id>
<journal-title><![CDATA[Gen]]></journal-title>
<abbrev-journal-title><![CDATA[Gen]]></abbrev-journal-title>
<issn>0016-3503</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Venezolana de Gastroentereología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-35032009000400002</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Inhibidores de bomba y Clopidogrel]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Machado]]></surname>
<given-names><![CDATA[Leopoldo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Policlínica Santiago de León Gastroenterólogo Vías Digestivas ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<volume>63</volume>
<numero>4</numero>
<fpage>254</fpage>
<lpage>254</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0016-35032009000400002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0016-35032009000400002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0016-35032009000400002&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p align="center"> <span style="font-family: Verdana; color: #231F20; font-weight: 700"> Inhibidores de bomba y Clopidogrel</span></p>     <p align="center"><font face="Verdana" size="2">Dr. Pérez  Machado Leopoldo Gastroenterólogo Vías Digestivas. Policlínica Santiago de León.  Caracas - Venezuela.</font></p>     <p><font face="Verdana" size="2">Los inhibidores de la bomba  de protones (IBP) constituyen hoy en día una parte fundamental en el control de  la secreción ácida gástrica. El tratamiento de la enfermedad ulceropéptica y de  la patología relacionada con la presencia de ácido en el tubo digestivo superior  sufrió un cambio radical desde que en 1972 la Cimetidina con su acción  controlando el efecto H-2 fue comprobada como efectiva en el tratamiento de la  úlcera duodenal.</font></p>     <p><font face="Verdana" size="2">Otros inhibidores del efecto  de la histamina sobre la secreción ácida pronto aparecieron y demostraron su  utilidad en éste sentido. El desarrollo de moléculas que bloqueaban la bomba de  protones<sup>(1)</sup> y producían un control sobre la secreción ácida y así  efecto terapéutico mayor está sustentado en numerosas publicaciones.</font></p>     <p><font face="Verdana" size="2">La disminución en el Ph  intraluminal gástrico además de permitir tratamiento de las patologías donde el  factor ácido es fundamental, conduce a otras condiciones que pueden resultar en:</font></p>     <p><font face="Verdana" size="2">•Disminución de la capacidad  para impedir el paso de bacterias ingeridas hacia el intestino delgado<sup>(2)</sup>.</font></p>     <p><font face="Verdana" size="2">•Aumento en infecciones por  la razón anterior, a nivel pulmonar<sup>(3)</sup>, colon-colitis seudomembranosa<sup>(4)</sup>  y otros.</font></p>     <p><font face="Verdana" size="2">•Enteropatia Eosinofílica<sup>(5)</sup>.</font></p>     <p><font face="Verdana" size="2">•Fractura de cadera por  osteoporosis<sup>(6)</sup>.</font></p>     <p><font face="Verdana" size="2">•Pólipos hiperplásicos de  cuerpo y fundus<sup>(7)</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Algunas de las moléculas de  IBP se metabolizan por el paso del citocromo P4502C19. Este es un mecanismo de  mucha variabilidad genética y la competencia para éste paso metabólico no es  igual en los distintos seres humanos; por ésta razón es poco lo que se puede  preveer desde el punto de vista terapéutico cuando dos moléculas administradas  conjuntamente se metabolizan por la misma vía y cuando dos moléculas compiten  porel mismo paso metabólico su efecto será variable y sus resultados poco  predecibles<sup>(8)</sup>.</font></p>     <p><font face="Verdana" size="2">El clopidogrel usado como  antiagregante plaquetario es una prodroga<sup>(9)</sup>, es decir, ejerce su  efecto al metabolizarse por el citocromo P4502C19. Hoy día es aceptado como un  importante elemento terapéutico en pacientes a los cuales se le ha realizado una  angioplastia coronaria o luego de un infarto del miocardio. Con frecuencia se  asocia con aspirina en dosis bajas y otros medicamentos por patología  concomitante.</font></p>     <p><font face="Verdana" size="2">La anterior asociación, de un  antiagregante plaquetario y aspirina hace razonable el empleo de IBP con el fin  de controlar complicaciones en el tracto digestivo superior<sup>(10)</sup>.</font></p>     <p><font face="Verdana" size="2">Justificándose de ésta forma  la asociación de un IBP con clopidogrel y aspirina, es necesario intentar  contestar una pregunta que surge, cuando se analizan publicaciones donde se  encuentra que un IBP como el Pantoprazol</font></p>     <p><font face="Verdana" size="2">INHIBIDORES DE BOMBA Y  CLOPIDOGREL que no se metaboliza por el citocromo que necesita el clopidogrel  para hacerse droga activa, permite mantener el efecto terapéutico  antiplaquetario y no así otros IBP que disminuyen esa acción.</font></p>     <p><font face="Verdana" size="2">Gillard y col<sup>(11) </sup> analizan el índice de reactividad plaquetaria en 140 pacientes randozimados a  omeprazol o placebo y en tratamiento con clopidogrel. Hubo diferencia  significativa para el grupo placebo. El grupo con omeprazol presentó resistencia  al tratamiento con clodiprogel. Cuisset y col<sup>(12)</sup> encontraron en dos  grupos de pacientes tratados con Omeprazol o Pantoprazol y que recibían  Clopidogrel una diferencia entre los dos grupos con resistencia en el grupo  omeprazol; en ésta investigación se emplearon dosis bajas de IBP( 20 mg) y altas  de Clopidogrel (150 mg). Resultados similares encuentran Norgard et al<sup>(13)</sup>.</font></p>     <p><font face="Verdana" size="2">Otros estudios, Siller et al<sup>(14)</sup>  no encuentran diferencia entre pacientes tratados con dos tipos de IBP. En  conclusión: se necesitan estudios randomizados, doble ciego con mayor número de  pacientes para establecer definitivamente si existe una acción significativa de  algunos IBP sobre el efecto antiagregante plaquetario del Clopidogrel; parece  razonable aceptar por ahora que en pacientes que necesiten terapéutica con  Clodiprogel, si es necesario emplear IBP, debe preferirse el uso de Pantoprazol.</font></p>     <p><b><font face="Verdana" size="2">REFERENCIAS BIBLIOGRÁFICAS</font></b></p>     <!-- ref --><p><font face="Verdana" size="2">1. Fennerty MB. Review  article: alternative approaches to the long term management of GERD. Aliment  Pharmacol Ther 2005;22 (suppl 3):39-44.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965881&pid=S0016-3503200900040000200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">2. Mallow S.Rabuck JA,Osler  T, et al. Do proton pump inhibitors Increase the incidence of nosocomial  pneumonia and related infectious complications when compared with histamine-2  receptor antagonists in critically ill trauma patients? Curr Surg 2004;61:452-8.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965882&pid=S0016-3503200900040000200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">3. Laheji RJ, Sturkenboom MC,  Manoukian C, et al. Risk of community-acquired pneumonia and use of gastric acid  suppressive drugs. JAMA 2004;292:1955-60.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965883&pid=S0016-3503200900040000200003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">4-Dial S, Delaney JC,  Schneider V, Suissa S. Proton pump inhibitor use and risk of community acquired  Clostridium difficile-associated diarrea defined by prescription for oral  vancomycen therapy. CMAJ 2006;171:33-8.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965884&pid=S0016-3503200900040000200004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">5. Merwat SM, Spechler SJ.  Might the use of acid suppresive medications predispose to the development of  eosinophilic esophagistis ?. J. Am. Coll. Gastroent. 2009,104:1897-1902.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965885&pid=S0016-3503200900040000200005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">6. Yang YX, Lewis JD, Epstein  S, Metz DC. Long term proton pump inhibitor therapy and risk of hip fracture.  JAMA 2006;296:2947-53.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965886&pid=S0016-3503200900040000200006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">7. Jalving M, et al.  Increased risk of fundic gland polyps during long-term proton pump inhibitor  therapy. Aliment Pharmacol Ther 2006;24:1341-8.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965887&pid=S0016-3503200900040000200007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">8. Lau WC, Gurbel PA, Watkins  PB, et al. Contribution of hepatic cytochrome P450 3A4 metabolic activity to the  phenomenon of Clopidogrel resistance. Circulation 2004;109:166-71.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965888&pid=S0016-3503200900040000200008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">9. Collet JP,Hulot JS,Pena A,  et al. Cytochrome P450 2C19 polymorphism in young patients treated with  clopidogrel after myocardial infarction: a cohort study. Lancet 2009;373:309-17.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965889&pid=S0016-3503200900040000200009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">10. Bhatt DL, Scheiman J,  Abraham NS, et al. ACCF/ACG/AHA 2008 expert consensus document on reducing the  gastrointestinal risks of antiplatelet therapy and NSAD use: a report of the  American College of Caradiology Foundation Task Force on Clinical Expert  Consensus Documents. J Am CollCardiol 2008;52:1502-17.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965890&pid=S0016-3503200900040000200010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">11. Gilard M, Arnaud B,  Conelly JC, et al. Influence of omeprazole on the antiplatlet action of  clopidogral associated with aspirin. J. Am. Coll. Cardiol. 2008,51:256-80.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965891&pid=S0016-3503200900040000200011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">12. Cuisset T, Frere C,  Quilicy J, et al. Comparison of omeprazole and pantoprazole influence on a high  150-mg clopidogrel maintenance dose. J. Am. Coll. Cardiol. 2009,54: 1149-1153.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965892&pid=S0016-3503200900040000200012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">13. Norgard NB, Mathews KD,  Wall GC. Drug-drug interaction between clopidogrel and the proton pump  inhibitors. Ann Pharmacother. 2009;43:1266-1274.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2965893&pid=S0016-3503200900040000200013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">14. 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