<?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>0120-5633</journal-id>
<journal-title><![CDATA[Revista Colombiana de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Colomb. Cardiol.]]></abbrev-journal-title>
<issn>0120-5633</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Cardiologia. Oficina de Publicaciones]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56332013000500006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análogos de incretina e inhibidores de la DDP-4: ¿qué papel desempeñan en la prevención primaria de las enfermedades cardiovasculares?]]></article-title>
<article-title xml:lang="en"><![CDATA[Incretin analogs and inhibitors of DPP-4: which is their role in the primary prevention of cardiovascular diseases?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Jaramillo]]></surname>
<given-names><![CDATA[Patricio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velandia]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[Tatiana]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez]]></surname>
<given-names><![CDATA[Julie]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Fundación Oftalmológica de Santander  ]]></institution>
<addr-line><![CDATA[Floridablanca ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Santander Facultad de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Pontificia Universidad Católica del Ecuador  ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<volume>20</volume>
<numero>5</numero>
<fpage>287</fpage>
<lpage>299</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56332013000500006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56332013000500006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56332013000500006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La diabetes mellitus tipo 2 (DM2) es una enfermedad altamente prevalente, la cual ha mostrado un incremento acelerado en las últimas décadas, pues se ha duplicado el número de personas con esta enfermedad. Diversos estudios epidemiológicos revelan que el 70% de las muertes por diabetes son causadas por eventos cardiovasculares (enfermedad coronaria y accidente cerebrovascular). Recientemente se ha observado una expansión en el descubrimiento de medicamentos para el manejo de la DM2, los mismos que, para su introducción en el mercado, deben mostrar beneficios adicionales para el sistema cardiovascular. Este artículo tiene como propósito determinar el papel de los nuevos medicamentos hipoglicemiantes que actúan en el sistema de las incretinas y sus efectos en la prevención primaria de eventos cardiovasculares.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Type 2 diabetes mellitus (T2DM) is a highly prevalent disease, which has shown a rapid increase in recent decades, doubling the number of people with this disease. Several epidemiological studies show that 70% of diabetes deaths are caused by cardiovascular events (coronary heart disease and stroke). Recently there has been an expansion in the discovery of drugs for the management of type 2 diabetes. These drugs must demonstrate additional cardiovascular system benefits before its introduction in the market. This paper aims to determine the role of new antidiabetic drugs that act on the incretin system and its effects on the primary prevention of cardiovascular events.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[diabetes]]></kwd>
<kwd lng="es"><![CDATA[enfermedades cardiovasculares]]></kwd>
<kwd lng="es"><![CDATA[farmacología]]></kwd>
<kwd lng="es"><![CDATA[inhibidores]]></kwd>
<kwd lng="en"><![CDATA[diabetes]]></kwd>
<kwd lng="en"><![CDATA[cardiovascular disease]]></kwd>
<kwd lng="en"><![CDATA[pharmacology]]></kwd>
<kwd lng="en"><![CDATA[inhibitors]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">     <p><font size="4" face="Verdana">    <center><b>An&aacute;logos de incretina e inhibidores de la DDP-4: &iquest;qu&eacute; papel desempe&ntilde;an en la prevenci&oacute;n primaria de las enfermedades cardiovasculares?</b></center></font></p>     <p><font size="3" face="Verdana">    <center><b>Incretin analogs and inhibitors of DPP-4: which is their role in the primary prevention of cardiovascular diseases?</b></center></font></p>       <p>    <center>Patricio L&oacute;pez-Jaramillo, MD., PhD., FACP.<sup>(1, 2)</sup>; Carlos Velandia, MD.<sup>(1)</sup>; Gabriela Castillo, MD.<sup>(3)</sup>; Tatiana S&aacute;nchez, MD.<sup>(1)</sup>; Julie &Aacute;lvarez, MD.<sup>(1) </sup>   </center></p>     <p><sup>(1)</sup>	Direcci&oacute;n de Investigaciones, Desarrollo e Innovaci&oacute;n Tecnol&oacute;gica y Cl&iacute;nica de S&iacute;ndrome Metab&oacute;lico, Prediabetes y Diabetes. Fundaci&oacute;n Oftalmol&oacute;gica de Santander - Cl&iacute;nica Carlos Ardila Lulle (FOSCAL). Floridablanca - Santander, Colombia.    <br> <sup>(2)</sup>	Direcci&oacute;n de Investigaciones, Facultad de Medicina, Universidad de Santander (UDES). Floridablanca - Santander, Colombia.    <br> <sup>(3)</sup>	Pontificia Universidad Cat&oacute;lica del Ecuador (PUCE). Quito, Ecuador.</p>     ]]></body>
<body><![CDATA[<p><b>Correspondencia</b>: Dr. Patricio L&oacute;pez-Jaramillo, Calle 155 A No. 23-09, El Bosque, Floridablanca, Santander, Colombia. Tel&eacute;fonos: (57-7) 6386000 Ext. 4165-4166. Fax: (57-7) 6388108. </p>       <p>Correo electr&oacute;nico: <a href="mailto:jplopezj@gmail.com">jplopezj@gmail.com</a> / <a href="mailto:investigaciones@foscal.com.co">investigaciones@foscal.com.co</a></p>     <p>Recibido: 19/11/2012. Aceptado: 23/07/2013.</p> <hr size="1">       <p>La diabetes mellitus tipo 2 (DM2) es una enfermedad altamente prevalente, la cual ha mostrado un incremento acelerado en las &uacute;ltimas d&eacute;cadas, pues se ha duplicado el n&uacute;mero de personas con esta enfermedad. Diversos estudios epidemiol&oacute;gicos revelan que el 70% de las muertes por diabetes son causadas por eventos cardiovasculares (enfermedad coronaria y accidente cerebrovascular). Recientemente se ha observado una expansi&oacute;n en el descubrimiento de medicamentos para el manejo de la DM2, los mismos que, para su introducci&oacute;n en el mercado, deben mostrar beneficios adicionales para el sistema cardiovascular. Este art&iacute;culo tiene como prop&oacute;sito determinar el papel de los nuevos medicamentos hipoglicemiantes que act&uacute;an en el sistema de las incretinas y sus efectos en la prevenci&oacute;n primaria de eventos cardiovasculares.</p>       <p><b><i>Palabras clave</i></b>: diabetes, enfermedades cardiovasculares, farmacolog&iacute;a, inhibidores.</p> <hr size="1">     <p>Type 2 diabetes mellitus (T2DM) is a highly prevalent disease, which has shown a rapid increase in recent decades, doubling the number of people with this disease. Several epidemiological studies show that 70% of diabetes deaths are caused by cardiovascular events (coronary heart disease and stroke). Recently there has been an expansion in the discovery of drugs for the management of type 2 diabetes. These drugs must demonstrate additional cardiovascular system benefits before its introduction in the market. This paper aims to determine the role of new antidiabetic drugs that act on the incretin system and its effects on the primary prevention of cardiovascular events.</p>       <p><b><i>Keywords</i></b>: diabetes, cardiovascular disease, pharmacology, inhibitors.</p> <hr size="1">     <p><font size="3" face="Verdana"><b>Introducci&oacute;n</b></font></p>       <p>La diabetes mellitus tipo 2 (DM2) es una patolog&iacute;a cada vez m&aacute;s frecuente, con una prevalencia mundial que contin&uacute;a increment&aacute;ndose de manera alarmante. Las complicaciones microvasculares de la DM2, como retinopat&iacute;a, neuropat&iacute;a y nefropat&iacute;a, son de alto costo y de gran impacto en la calidad de vida del paciente. Sin embargo, son las enfermedades cardiovasculares: infarto agudo del miocardio y accidente cerebrovascular, las causas m&aacute;s comunes de morbilidad y mortalidad en los pacientes diab&eacute;ticos (1). La DM2 es, por s&iacute; misma, un factor de riesgo para el desarrollo de enfermedades cardiovasculares; de hecho, el riesgo de que una persona con DM2 desarrolle enfermedades cardiovasculares es 2 a 4 veces mayor al que se ha visto en la poblaci&oacute;n general de edad y sexo similares. Las complicaciones macrovasculares por aterosclerosis son responsables del 70% al 80% de todas las causas de muerte en los pacientes con diabetes, constituyendo m&aacute;s del 75% de todas las hospitalizaciones ocasionadas por las complicaciones de la DM2 (2). En la actualidad existen diversas intervenciones farmacol&oacute;gicas para el control de los niveles de glucosa en los pacientes con DM2, algunos recientemente introducidos en el mercado de medicamentos. Estos nuevos f&aacute;rmacos, adem&aacute;s de la eficacia en la disminuci&oacute;n de los niveles de glucosa, que son m&aacute;s o menos comparables, deben tambi&eacute;n demostrar que son ben&eacute;ficos en el desarrollo de las enfermedades cardiovasculares que acompa&ntilde;an la DM2 o que al menos son neutros, ya que algunos de los f&aacute;rmacos antidiab&eacute;ticos (roziglitazona, sulfonilureas) han mostrado efectos desfavorables sobre la morbimortalidad ocasionada por alteraciones del sistema cardiovascular y tambi&eacute;n sobre la mortalidad total (3, 4). Por tanto, los nuevos tratamientos disponibles para el manejo de la DM2 deben ser evaluados no s&oacute;lo por su efecto hipoglicemiante, sino, adem&aacute;s, por sus efectos generales sobre el perfil de riesgo cardiovascular y mortalidad total en los pacientes con DM2 (5). En este art&iacute;culo se revisan las caracter&iacute;sticas de los f&aacute;rmacos que act&uacute;an sobre el sistema de las incretinas y el impacto potencial que pudieran brindar sobre el sistema cardiovascular.</p>     <p><font size="3" face="Verdana"><b>Epidemiolog&iacute;a de la diabetes mellitus tipo 2</b></font></p>       ]]></body>
<body><![CDATA[<p>La prevalencia de la DM2 ha presentado un crecimiento acelerado en todo el mundo durante las &uacute;ltimas d&eacute;cadas, especialmente en los pa&iacute;ses en v&iacute;a de desarrollo. En el a&ntilde;o 2010, alrededor de 256 millones de personas en el mundo padec&iacute;an esta enfermedad (1), con un estimado aproximado de 439 millones de personas afectadas para el a&ntilde;o 2030, lo cual representar&iacute;a el 7,7% del total de la poblaci&oacute;n adulta mundial (6).</p>       <p>Por otro lado, la DM2, tradicionalmente considerada un trastorno metab&oacute;lico exclusivo de los adultos, se ha vuelto cada vez m&aacute;s com&uacute;n en los j&oacute;venes, en los adolescentes y en los ni&ntilde;os. Por ejemplo, la prevalencia cruda de DM2 entre los ni&ntilde;os y j&oacute;venes norteamericanos entre los 10-19 a&ntilde;os en el a&ntilde;o 2001 fue estimada en 42 casos por cada 100.000 j&oacute;venes (7, 8).</p>       <p>En comparaci&oacute;n con los pa&iacute;ses desarrollados, la proporci&oacute;n de j&oacute;venes de mediana edad con DM2 es mayor en los pa&iacute;ses en desarrollo (6). Hoy se observa un comportamiento inusual de la enfermedad, que podr&iacute;a describirse como una epidemia que afecta especialmente a los pa&iacute;ses en v&iacute;a de desarrollo (9). Este comportamiento se explica por el desarrollo econ&oacute;mico desordenado que ha tra&iacute;do como consecuencia la urbanizaci&oacute;n acelerada, la transici&oacute;n de la nutrici&oacute;n y el sedentarismo en un per&iacute;odo relativamente corto. La urbanizaci&oacute;n r&aacute;pidamente creciente y desordenada, determina que los individuos compartan m&uacute;ltiples carencias sanitarias, con un acceso relativamente f&aacute;cil a estilos de vida y comportamientos impuestos por la &quot;vida moderna&quot;: tabaquismo, sedentarismo, alcoholismo, estr&eacute;s psicosocial, dieta rica en harinas, grasas saturadas y bebidas azucaradas (10). A este fen&oacute;meno emergente se le ha denominado previamente &quot;patolog&iacute;a socio &ndash; econ&oacute;mica&quot; en la cual se propone que el s&iacute;ndrome metab&oacute;lico (SM), la DM2 y las enfermedades cardiovasculares no son m&aacute;s que una respuesta biol&oacute;gica normal de los individuos a un desarrollo anormal de la sociedad (11).</p>     <p><font size="3" face="Verdana"><b>Factores de riesgo comunes para diabetes mellitus 2 y enfermedades cardiovasculares</b></font></p>       <p>Factores de riesgo convencionales que incluyen dislipidemia, obesidad, falta de actividad f&iacute;sica e historia familiar contribuyen de manera similar al desarrollo de enfermedades cardiovasculares en diab&eacute;ticos y no diab&eacute;ticos, pero tambi&eacute;n predisponen al desarrollo de DM2. Las tasas de asociaci&oacute;n de dichos factores en los sujetos diab&eacute;ticos son realmente altas, aunque no del todo suficientes para explicar el riesgo exagerado de enfermedades cardiovasculares en la poblaci&oacute;n diab&eacute;tica (12). Diversos estudios prospectivos han demostrado que la hiperglicemia por s&iacute; sola est&aacute; claramente involucrada en la predicci&oacute;n de eventos cardiovasculares (13). El riesgo de muerte de origen cardiovascular y de presentaci&oacute;n de eventos cardiovasculares se incrementa de manera significativa en los sujetos cuya HbA1c se encuentra en niveles superiores al 7%, a diferencia de los sujetos diab&eacute;ticos con niveles bajos de HbA1c (14). De hecho, la diabetes tambi&eacute;n considera un &quot;equivalente de riesgo coronario&quot; ya que se ha observado que el riesgo de mortalidad cardiovascular por DM2 es igual al de los pacientes que tienen el antecedente de haber presentado infarto agudo del miocardio (aproximadamente el 20%) y este riesgo se triplica en aquellos diab&eacute;ticos que han tenido previamente un infarto agudo del miocardio (15). Por otro lado, la isquemia silente y la enfermedad coronaria asintom&aacute;tica son m&aacute;s frecuentes en personas con DM2. En un meta-an&aacute;lisis colaborativo reciente, que incluy&oacute; 102 estudios prospectivos, se demostr&oacute; que existe un incremento del riesgo de enfermedad coronaria pero no de accidente cerebrovascular isqu&eacute;mico, en sujetos no diab&eacute;ticos cuyos niveles de glucosa se encuentran en cifras de 100 mg/dL. Selvin y colaboradores (17) en un elegante estudio, demostraron que en adultos no diab&eacute;ticos el riesgo de desarrollar DM2 y enfermedades cardiovasculares se incrementa a partir de cifras de HbA1c iguales o superiores a 6%.</p>     <p><font size="3" face="Verdana"><b>Otras complicaciones cardiovasculares relacionadas con la diabetes</b></font></p>       <p>Despu&eacute;s del diagn&oacute;stico de DM2, la mayor&iacute;a de pacientes mal controlados desarrolla complicaciones cardiovasculares. La disfunci&oacute;n microvascular puede conducir a morbilidad significativa y mortalidad prematura, y los eventos macrovasculares son la causa principal de muerte en los pacientes diab&eacute;ticos con falla cardiaca. Las causas de la insuficiencia cardiaca han cambiado en las &uacute;ltimas dos d&eacute;cadas; a finales de 1970, la enfermedad valvular reum&aacute;tica era la principal causa de esta enfermedad, hoy en d&iacute;a lo es la enfermedad isqu&eacute;mica. En la actualidad se conoce bien la enfermedad y se cuenta con t&eacute;cnicas que permiten evaluar la disfunci&oacute;n cardiaca; sin embargo, en la mayor&iacute;a de casos s&oacute;lo se diagnostica la disfunci&oacute;n sist&oacute;lica y muchas veces se pasa por alto la disfunci&oacute;n diast&oacute;lica (18). Este &uacute;ltimo diagn&oacute;stico es importante dado que la disfunci&oacute;n sist&oacute;lica y diast&oacute;lica generalmente coexisten (19). Algunos estudios indican que la disfunci&oacute;n sist&oacute;lica aislada puede ser responsable hasta del 50% de las admisiones, usualmente denominadas &quot;falla cardiaca&quot;, que cursa con fracci&oacute;n de eyecci&oacute;n normal y con mayor impacto en la evoluci&oacute;n del paciente (20). En los pacientes con intolerancia a la glucosa el grado de disfunci&oacute;n diast&oacute;lica es m&aacute;s grave. La falla cardiaca con fracci&oacute;n de eyecci&oacute;n normal es m&aacute;s com&uacute;n en pacientes con historia de diabetes, al parecer debido a la existencia de varios factores de riesgo o de comorbilidades, entre las que se incluyen aterosclerosis, hipertensi&oacute;n, obesidad, hiperglicemia prolongada, enfermedad microvascular y glicosilaci&oacute;n de prote&iacute;nas mioc&aacute;rdicas (21). Cuanto m&aacute;s larga es la duraci&oacute;n de la diabetes mal controlada, mayor es la dificultad de tratar y controlar la hiperglicemia y la disfunci&oacute;n cardiaca y mayor la probabilidad de que el paciente con diabetes desarrolle falla cardiaca. Adem&aacute;s, el riesgo de muerte se incrementa en los pacientes diab&eacute;ticos que desarrollan falla cardiaca (22).</p>       <p><b>Miocardiopat&iacute;a diab&eacute;tica</b></p>       <p>Se define como una disfunci&oacute;n ventricular que ocurre en las personas diab&eacute;ticas y cuya causa no ha podido ser identificada; pasa inadvertida la mayor&iacute;a de veces por lo que es poco diagnosticada (23). Aunque se desconoce su causa, se ha observado que los pacientes con enfermedad isqu&eacute;mica y diabetes tienen un riesgo incrementado de desarrollar falla cardiaca o miocardiopat&iacute;a diab&eacute;tica (24), asociados a micro-angiopat&iacute;a, fibrosis mioc&aacute;rdica y metabolismo mioc&aacute;rdico anormal. Adicionalmente, la miocardiopat&iacute;a est&aacute; m&aacute;s fuertemente relacionada con complicaciones microvasculares que con complicaciones macrovasculares de la DM2 (25).</p>       <p><b>Accidente cerebrovascular</b></p>       ]]></body>
<body><![CDATA[<p>La muerte por accidente cerebrovascular en pacientes diab&eacute;ticos es tres veces m&aacute;s com&uacute;n que en aquellos sin esta enfermedad. Cerca del 13% de los diab&eacute;ticos mayores de 65 a&ntilde;os han presentado alg&uacute;n tipo de accidente cerebrovascular (26). Recientemente, el estudio INTER-STROKE (27) demostr&oacute; que la obesidad abdominal, la cual se asocia con resistencia a la insulina y DM2, es el factor con mayor riesgo poblacional atribuible para accidente cerebrovascular isqu&eacute;mico y hemorr&aacute;gico.</p>     <p><font size="3" face="Verdana"><b>Aspectos epidemiol&oacute;gicos relevantes del inicio temprano en el tratamiento de la DM2</b></font></p>       <p>El riesgo de enfermedades cardiovasculares comienza a incrementarse incluso antes de la aparici&oacute;n de la diabetes. Varios estudios (28-31) han confirmado el incremento del riesgo de enfermedades cardiovasculares en los pacientes con glucosa alterada en ayunas (IFG) y test de tolerancia a la glucosa alterado (IGTT); adem&aacute;s, la resistencia a la insulina en ausencia de evidencia de diabetes tambi&eacute;n se ha relacionado con disfunci&oacute;n endotelial, un marcador indirecto de aterosclerosis. Por lo tanto, es posible que el proceso ateroscler&oacute;tico se presente antes en el espectro de resistencia a la insulina.</p>       <p>La resistencia a la insulina asociada a la hiperglicemia postprandial puede desempe&ntilde;ar un papel en el desarrollo y la progresi&oacute;n de las enfermedades cardiovasculares en pacientes con diagn&oacute;stico reciente de diabetes. En efecto, en el estudio &quot;Funagata&quot;, el an&aacute;lisis de supervivencia concluy&oacute; que las tasas de IGTT, fue un factor de riesgo para el desarrollo de enfermedades cardiovasculares (32).</p>       <p>Entretanto, el estudio DECODE (33) demostr&oacute; que la hiperglicemia a las dos horas post-carga se asoci&oacute; con mayor riesgo de mortalidad por enfermedades cardiovasculares, independiente del valor de la glicemia en ayunas. Este estudio tambi&eacute;n demostr&oacute; que las anomal&iacute;as de la glucosa en plasma a las dos horas post-carga, fueron mejores predictores de mortalidad por enfermedad cardiovascular y no cardiovascular que la glicemia en ayuno aislada. Adem&aacute;s, el Diabetes Intervention Study (DIS) (34), identific&oacute; la hiperglicemia postprandial como un factor de riesgo independiente de infarto agudo del miocardio y de todas las causas de mortalidad. Por otra parte, la hiperglicemia postprandial se ha asociado con disfunci&oacute;n endotelial y aumento del grosor &iacute;ntima-media, as&iacute; como con mayor prevalencia de placas ateroscler&oacute;ticas en las arterias car&oacute;tidas comunes, lo que sugiere que la hiperglicemia postprandial leve a moderada est&aacute; implicada en el desarrollo de aterosclerosis temprana.</p>       <p>En el estudio UKPDS se observ&oacute; que un control intensivo de la glicemia redujo de manera efectiva las complicaciones microvasculares en los pacientes diab&eacute;ticos tipo 2 (35). Sin embargo, el riesgo de infarto agudo del miocardio se redujo sutilmente (cerca del 15%). Dado que la reducci&oacute;n en la hiperglicemia fue m&iacute;nima y el periodo de intervenci&oacute;n fue relativamente corto, los efectos en el control de la glicemia sobre las enfermedades cardiovasculares pudieron haber sido subestimados. En el seguimiento realizado a los diez a&ntilde;os del estudio UKPDS, el UKPDS80 (36), se continu&oacute; observando una reducci&oacute;n en el riesgo microvascular pero adem&aacute;s de esto, una disminuci&oacute;n significativa del riesgo de infarto agudo del miocardio y muerte por cualquier causa. Estos resultados confirman que la llamada &quot;memoria metab&oacute;lica&quot; puede causar anormalidades cr&oacute;nicas y ejercer efectos a nivel de los vasos de los diab&eacute;ticos, que no se revierten f&aacute;cilmente, incluso con un control posterior adecuado de la glicemia. Adem&aacute;s sugieren una influencia positiva a largo plazo del control metab&oacute;lico temprano, es decir, sobre el riesgo de complicaciones vasculares y muerte en diab&eacute;ticos. Se ha propuesto (37) que la prevenci&oacute;n de las complicaciones vasculares en el paciente con DM2 depende fundamentalmente del momento de inicio del tratamiento intensivo para mantener permanentemente los niveles de HbA1C por debajo de 6% y la glicemia en ayunas por debajo de 100 mg/dL. Cuanto m&aacute;s temprano el inicio agresivo del tratamiento, probablemente durante los estados de IFG y IGTT, conocidos tambi&eacute;n como prediabetes, mejor perfil de prevenci&oacute;n de complicaciones micro y macrovasculares (37). Esta propuesta se sustenta en el hecho de que la hiperglicemia cr&oacute;nica se relaciona con la generaci&oacute;n de los productos finales de glicaci&oacute;n avanzada (AGES), los cuales est&aacute;n involucrados en el desarrollo de las complicaciones de la DM2 (38). La acumulaci&oacute;n de AGES se asocia con aumento en la generaci&oacute;n de especies reactivas de ox&iacute;geno (ROS) y con menor producci&oacute;n de &oacute;xido n&iacute;trico endotelial y neuronal (NO) (39). En un modelo experimental de diabetes inducido por estreptozotocina, se demostr&oacute; que el retardo en la administraci&oacute;n de insulina ocasiona una falla para normalizar los niveles s&eacute;ricos elevados de AGES, asociada con degeneraci&oacute;n nitr&eacute;rgica irreversible y p&eacute;rdida de la funci&oacute;n nitr&eacute;rgica a pesar de que la administraci&oacute;n de insulina despu&eacute;s de doce semanas de que las ratas se hicieran diab&eacute;ticas, normaliz&oacute; los niveles de glucosa. Estos resultados sugieren que los AGES antes que la hiperglicemia &quot;per se&quot; son los responsables de la formaci&oacute;n de ROS y de la injuria tisular en fases tard&iacute;as de la diabetes. En los humanos como en los animales, la acumulaci&oacute;n de AGES puede participar en el desarrollo de disfunci&oacute;n vascular y consecuentemente de enfermedades cardiovasculares. Por esto se plantea que el riesgo cardiovascular del paciente con DM2 est&aacute; directamente relacionado con la duraci&oacute;n de la diabetes.</p>     <p><font size="3" face="Verdana"><b>&iquest;Existen medicamentos antidiab&eacute;ticos con capacidad de reducir el riesgo cardiovascular?</b></font></p>       <p>El &uacute;nico agente antidiab&eacute;tico que ha demostrado claramente una reducci&oacute;n en la morbilidad y mortalidad cardiovascular es la metformina. El estudio UKPDS 34 mostr&oacute; que la terapia con metformina redujo de manera significativa (42%) el riesgo de muerte relacionado con diabetes (95% CI, 9% a 63%) en comparaci&oacute;n con la insulina o las sulfonilureas (clorpropamida o glibenclamida). Adem&aacute;s, en el seguimiento realizado a los diez a&ntilde;os post-ensayo, se evidenci&oacute; un beneficio persistente en la supervivencia de los sujetos, los cuales presentaron una reducci&oacute;n del 33% en el riesgo de muerte relacionado con diabetes (40). Sin embargo, un reciente meta-an&aacute;lisis ha cuestionado el beneficio cardiovascular de la metformina al compararla con otros medicamentos antidiab&eacute;ticos (41).</p>     <p><font size="3" face="Verdana"><b>Nuevos medicamentos hipoglicemiantes</b></font></p>       <p>Durante los &uacute;ltimos a&ntilde;os se han aprobado, para uso cl&iacute;nico, una variedad de nuevos f&aacute;rmacos antidiab&eacute;ticos, y existen agentes que se est&aacute;n desarrollando en la actualidad. Todos ellos se enfrentan a nuevas regulaciones creadas por la demanda no s&oacute;lo de disminuir la HbA1c, sino de proporcionar beneficios a largo plazo y seguridad cl&iacute;nica cardiovascular (42, 43).</p>       ]]></body>
<body><![CDATA[<p>En consecuencia, y a pesar de la disponibilidad de casi una docena de distintas clases de medicamentos hipoglicemiantes para el manejo de la DM2, sigue existiendo un inter&eacute;s considerable en el desarrollo de f&aacute;rmacos que puedan ofrecer ventajas cardiovasculares adem&aacute;s de los efectos sobre la glucosa. De hecho, la seguridad cardiovascular de varios agentes antidiab&eacute;ticos disponibles en la actualidad se ha cuestionado recientemente (42). Por consiguiente, la Food and Drug Administration (FDA) exige ahora una rigurosa estratificaci&oacute;n del riesgo cardiovascular para los nuevos f&aacute;rmacos antidiab&eacute;ticos. Esta estratificaci&oacute;n considera los meta-an&aacute;lisis de los eventos cardiovasculares que se producen durante las fases II y III de los ensayos cl&iacute;nicos, concediendo aprobaci&oacute;n directa, s&oacute;lo si el l&iacute;mite superior del 95% del intervalo de confianza (IC) de la raz&oacute;n de disparidad correspondiente, es inferior a 1,3. Por otro lado, las sustancias con un l&iacute;mite m&aacute;ximo del 95% de intervalo de confianza por encima de 1,8 est&aacute;n directamente prohibidas, mientras que todas las dem&aacute;s estar&aacute;n en la obligaci&oacute;n de realizar estudios cl&iacute;nicos cuyos resultados cardiovasculares demuestren seguridad, elemento indispensable antes de obtener la aprobaci&oacute;n final (43, 44).</p>       <p>A continuaci&oacute;n se revisan las caracter&iacute;sticas de los f&aacute;rmacos que act&uacute;an sobre el eje entero-insular, sus mecanismos de acci&oacute;n, los resultados obtenidos en el control de la glicemia y el impacto potencial sobre el sistema cardiovascular.</p>     <p><font size="3" face="Verdana"><b>Eje entero-insular</b></font></p>       <p><b>Incretinas</b></p>       <p>El efecto incretina fue descrito bajo la observaci&oacute;n de que la secreci&oacute;n de insulina es mayor tras la administraci&oacute;n oral de glucosa que luego de una dosis plasm&aacute;tica equivalente (45). Dicho efecto en sujetos sanos es el responsable del 50% al 70% de la secreci&oacute;n de insulina (46); sin embargo, esta respuesta a la carga oral de glucosa es menor en pacientes con DM2 (47). El eje entero-insular fue descrito por Creutzfeldt (48) y se bas&oacute; en el aislamiento de la primera incretina, el p&eacute;ptido inhibidor g&aacute;strico (GIP), el cual estimula la secreci&oacute;n de insulina (49). Posteriormente se describi&oacute; (50) una segunda incretina, denominada p&eacute;ptido semejante al glucag&oacute;n tipo 1 (GLP-1), que es la sustancia que tiene un mayor rol en el efecto incretina (51). En la <a href="img/revistas/rcca/v20n5/v20n5a6f1.jpg" target="_blank">figura 1</a> se describe la acci&oacute;n de las incretinas en varios de los tejidos donde act&uacute;a.</p>     <p><font size="3" face="Verdana"><b>An&aacute;logos de GLP-1</b></font></p>       <p>El GLP-1 es un polip&eacute;ptido de 30 amino&aacute;cidos transcrito en el gen del pre-glucag&oacute;n, el cual se localiza en el brazo largo del cromosoma 2 y est&aacute; expresado en las c&eacute;lulas &alpha; pancre&aacute;ticas y en las c&eacute;lulas L intestinales en el &iacute;leo distal y el colon (52) siendo esta &uacute;ltima la mayor fuente de GLP-1 end&oacute;gena (53). Pese a que su expresi&oacute;n en estas c&eacute;lulas es dependiente de la enzima convertasa de la pro-hormona (54), la mayor actividad del GLP-1 ocurre en el 80% con uno de sus dos isotipos, conocido como GLP-1 amida (7-36) (55).</p>       <p>Las c&eacute;lulas L se hallan yuxtapuestas con el lumen intestinal, en donde dan respuesta a las se&ntilde;ales locales de nutrientes (56), y tambi&eacute;n se encuentran en contacto con el sistema nervioso mesent&eacute;rico y vascular en donde los neurotransmisores y las hormonas endocrinas desempe&ntilde;an un rol importante en la regulaci&oacute;n de la secreci&oacute;n de GLP1.</p>       <p>El GLP-1, adem&aacute;s de estimular la secreci&oacute;n de insulina, disminuye la sobrecarga de trabajo a nivel de la c&eacute;lula &beta; por sus m&uacute;ltiples efectos pancre&aacute;ticos y extra-pancre&aacute;ticos: disminuye el vaciamiento g&aacute;strico y reduce el pico de absorci&oacute;n de nutrientes y la demanda de insulina (57). Adem&aacute;s, el GLP-1 reduce la secreci&oacute;n postprandial de glucag&oacute;n de las c&eacute;lulas &alpha; del p&aacute;ncreas, las cuales ayudan a mantener un balance entre insulina y glucag&oacute;n teniendo un beneficio indirecto para la c&eacute;lula &beta; al disminuir la carga de glucosa hep&aacute;tica postprandial (58). Por &uacute;ltimo, el GLP-1 tiene un efecto directo sobre el sistema nervioso central al incrementar la sensaci&oacute;n de saciedad y por consiguiente reducir la ingesta de alimentos, contribuyendo de esta manera a disminuir la sobrecarga de la c&eacute;lula &beta; (59).</p>     <p><font size="3" face="Verdana"><b>Eliminaci&oacute;n y metabolismo del GLP-1</b></font></p>       ]]></body>
<body><![CDATA[<p>El GLP-1 tiene tres mecanismos de eliminaci&oacute;n: renal, hep&aacute;tica y degradaci&oacute;n plasm&aacute;tica. Despu&eacute;s de su ingreso a la circulaci&oacute;n el GLP-1 es sometido a la r&aacute;pida acci&oacute;n de la enzima dipeptidil-peptidasa 4 DPP4 (60), la cual degrada r&aacute;pidamente y de manera fisiol&oacute;gica el GLP-1 amida (7-36) a GLP-1 amida (9-36) al eliminar el di-p&eacute;ptido N-terminal, lo que resulta en un GLP-1 con una afinidad cien veces menor por el receptor GLP1 (GLP-1 R), dando una completa falta de actividad insulinotr&oacute;pica (60). Como resultado de lo anterior, la actividad del GLP-1 es corta, con una vida media de aproximadamente dos minutos. Esta r&aacute;pida inactivaci&oacute;n de GLP-1 fue demostrada claramente por estudios en humanos donde se report&oacute; que despu&eacute;s de treinta minutos de la aplicaci&oacute;n subcut&aacute;nea, la forma inactiva de GLP-1 (9-36) amida representa un 78% del total del GLP-1 inmmunorreactivo (61); sin embargo, la forma GLP-1 amida (9-36) puede disminuir la glucosa plasm&aacute;tica por mecanismos independientes de la secreci&oacute;n de insulina (62). Teniendo en cuenta que este efecto es menor y con relevancia fisiol&oacute;gica a&uacute;n no definida (63), este p&eacute;ptido puede tener efectos hipoglicemiantes y cardioprotectores relevantes (64).</p>     <p><font size="3" face="Verdana"><b>Receptor de GLP-1</b></font></p>       <p><b>Receptor de GLP-1</b></p>       <p>El GIP y el GLP-1 se unen a diferentes receptores, los cuales act&uacute;an a trav&eacute;s de complejos prote&iacute;na-G receptor espec&iacute;fico. El GLP-1 R es una prote&iacute;na de 463 amino-&aacute;cidos (65) que ha sido reportada en islotes de p&aacute;ncreas (55), coraz&oacute;n (66), aorta (67), pulm&oacute;n (68), gl&aacute;ndulas g&aacute;stricas (69) y en ciertos lugares del sistema nervioso central y perif&eacute;rico (70-72). El gen que lo codifica se encuentra alojado en el cromosoma 6p21 (66).</p>       <p>Es bien conocido que la estimulaci&oacute;n del GLP-1 R, resulta en la activaci&oacute;n de una serie de sistemas de segundos mensajeros, conocidos por ser importantes en el proceso fisiopatol&oacute;gico de la DM2, tales como: cAMP, ERK1, caveolina-1 y sobrerregulaci&oacute;n del control de los genes homeobox PDX-1 en la c&eacute;lula beta (70, 73, 74).</p>       <p>A pesar de que se conocen, en parte, los efectos de la estimulaci&oacute;n del GLP-1 R, no todos los efectos del GLP-1 pueden explicarse por la uni&oacute;n y activaci&oacute;n pancre&aacute;tica cl&aacute;sica GLP-1R, espec&iacute;ficamente de las acciones de la GLP-1 amida (9-36), lo que ha llevado a postular la existencia de un posible segundo receptor para GLP-1, aunque la evidencia molecular todav&iacute;a es insuficiente (75, 76).</p>     <p><font size="3" face="Verdana"><b>Efectos de los agonistas del GLP-1 en la funci&oacute;n endotelial y cardiovascular y en el peso corporal</b></font></p>       <p>Como se anot&oacute; anteriormente, el GLP-1 act&uacute;a no solo en las c&eacute;lulas &beta; y en el tracto gastrointestinal, sino a nivel del sistema nervioso central, coraz&oacute;n, c&eacute;lulas musculares lisas vasculares, c&eacute;lulas endoteliales y macr&oacute;fagos (<a href="img/revistas/rcca/v20n5/v20n5a6f2.jpg" target="_blank">Figura 2</a>). Adem&aacute;s de regular el control de glucosa y el control metab&oacute;lico, el GLP-1 tiene un efecto en m&uacute;ltiples v&iacute;as involucradas en la aterog&eacute;nesis. Aunque los mecanismos de la acci&oacute;n vascular a&uacute;n son poco claros, parece ser que la acci&oacute;n protectora del GLP-1 puede relacionarse con una mejor&iacute;a de la disfunci&oacute;n endotelial (77). De acuerdo con los hallazgos en pacientes tratados con GLP-1 se observa una respuesta positiva en la funci&oacute;n ventricular izquierda (78, 79) y adem&aacute;s se reduce la circulaci&oacute;n de los niveles del p&eacute;ptido natriur&eacute;tico cerebral BNP (80, 81).</p>       <p>Otro beneficio potencial con el uso de GLP-1, como liraglutide y exenatide, es la reducci&oacute;n en el inhibidor del activador del plasmin&oacute;geno-1 (PAI-1)  en los pacientes con DM2, el cual est&aacute; implicado en la disfunci&oacute;n endotelial (82).</p>       <p>En un reciente meta-an&aacute;lisis se demostr&oacute; que el tratamiento con el agonista del receptor GLP-1 liraglutide, disminuye los niveles de prote&iacute;na C reactiva ultrasensible (PCR-us) en un 23% del nivel de base a los seis meses (83). Las terapias basadas en incretinas han demostrado reducir el peso corporal en la mayor&iacute;a de los pacientes con DM2 (84) y adicionalmente se ha observado una reducci&oacute;n en la grasa visceral durante el tratamiento con liraglutide (85). Con el uso de exenatide se observ&oacute; una reducci&oacute;n del 6%, 5%, 11% y 15% en el peso corporal, en la circunferencia de la cintura, en el peso total y en la grasa corporal en el tronco, respectivamente. Adicionalmente, el exenatide mostr&oacute; una reducci&oacute;n del 61% en los niveles de PCR-us y un incremento del 12% en la adiponectina (86). El tratamiento con agonistas de GLP-1 ha demostrado, de manera consistente, una reducci&oacute;n de la presi&oacute;n arterial (87), siendo esto &uacute;ltimo de gran inter&eacute;s, dado que esta reducci&oacute;n ocurre antes de la p&eacute;rdida de peso, lo que pudiera indicar un efecto directo sobre la presi&oacute;n arterial, con un mecanismo a&uacute;n no dilucidado.</p>     ]]></body>
<body><![CDATA[<p><font size="3" face="Verdana"><b>Efectos de los agonistas GLP-1 en HbA1C y marcadores de funci&oacute;n de c&eacute;lula beta</b></font></p>       <p>El exenatide ha mostrado una importante reducci&oacute;n de la HbA1c a las 16 semanas de tratamiento, similar al observado con insulina glargina, obteni&eacute;ndose un beneficio adicional de p&eacute;rdida de peso que oscil&oacute; entre 1,6 a 2,8 kg (88). Estudios pre-cl&iacute;nicos han mostrado que el exenatide mejora la funci&oacute;n y la masa de las c&eacute;lulas beta (89) y en pacientes optimiza el &iacute;ndice HOMA-R despu&eacute;s de 28 d&iacute;as de tratamiento (90). </p>       <p>El liraglutide es un an&aacute;logo sint&eacute;tico que tiene una homolog&iacute;a con GLP-1 del 97%, siendo resistente a la acci&oacute;n de la DPP-4 y que fue aprobada por la FDA y la EMEA para el tratamiento de la DM2.</p>       <p>En el estudio fase III denominado LEAD (Liraglutide Effect and Action in Diabetes) se mostr&oacute; una reducci&oacute;n cl&iacute;nica en HbA1c de alrededor del 1%, cuando fue administrada de manera simult&aacute;nea con metformina o sulfonilureas. En el LEAD 6 se observ&oacute; una reducci&oacute;n mayor en la HbA1c con liraglutide en comparaci&oacute;n con exenatide, pero la p&eacute;rdida de peso o el incremento de la masa de c&eacute;lulas beta, fueron similares (91).</p>     <p><font size="3" face="Verdana"><b>Efectos secundarios de los an&aacute;logos de GLP-1</b></font></p>       <p>Los principales efectos adversos de estos f&aacute;rmacos son n&aacute;useas y v&oacute;mito. En un estudio de post-mercadeo, se reportaron 30 casos de pancreatitis en 2007 y 2008, de los cuales seis fueron de pancreatitis hemorr&aacute;gica y necrotizante (92). Algunos efectos no-glic&eacute;micos de especial inter&eacute;s han sido reportados en ratones y primates no humanos como tumores tiroideos de c&eacute;lulas C (93), fibrosarcomas e hiperplasia de c&eacute;lulas C, efectos de seguridad que se encuentran actualmente en estudio.</p>     <p><font size="3" face="Verdana"><b>Inhibidores de la dipeptidil peptidasa 4 (DDP-4)</b></font></p>       <p>La DPP-4 es una glicoprote&iacute;na de 766 amino&aacute;cidos transmembrana, tambi&eacute;n conocida como adenosina desaminasa o CD26. Los inhibidores de la DPP-4 son cianopirrolidinas con interacciones clave con el complejo de la DPP-4 que permiten la inhibici&oacute;n competitiva. La DPP-4 se expresa en la superficie de varios tipos de c&eacute;lulas incluyendo monocitos y linfocitos (94,95). Es una enzima aminopeptidasa s&eacute;rica que inactiva la GLP-1, el GIP y otras prote&iacute;nas in vivo a trav&eacute;s de la escisi&oacute;n del dip&eacute;ptido amino&aacute;cido N-terminal. La dimerizaci&oacute;n de la prote&iacute;na es necesaria para la actividad catal&iacute;tica, y la funci&oacute;n de la enzima depende de su glicosilaci&oacute;n. Es importante destacar que son varios los sustratos de la DPP-4 e incluyen p&eacute;ptidos que contienen prolina o alanina, tales como factores de crecimiento, quimioquinas, neurop&eacute;ptidos y p&eacute;ptidos vasoactivos (96, 97). La inhibici&oacute;n de la enzima DPP-4 tambi&eacute;n modula la actividad de varios factores cardioactivos, neurop&eacute;ptidos y c&eacute;lulas estromales derivadas del factor-1 (SDF-1) (94). Por su afinidad para una amplia gama de sustratos, la DPP-4 no es espec&iacute;fica para GLP-1 y por lo tanto tiene el potencial para mediar una amplia gama de efectos pleiotr&oacute;picos (tanto positivos como negativos), independientes de GLP-1. Otros ejemplos de enzimas con actividad similar a DPP-4 incluyen la prote&iacute;na de activaci&oacute;n de fibroblastos, DPP-2, DPP-8 y DPP-9; por lo tanto, se cree que los inhibidores de la DPP-4 son selectivos para &eacute;sta pero que adem&aacute;s podr&iacute;an ser inhibidores de otras enzimas similares a la DPP-4 (98).</p>       <p>Los inhibidores de la DPP-4 disponibles en la actualidad incluyen sitagliptina, saxagliptina, linagliptina, vildagliptina y alogliptina. Los tres primeros se aprobaron en los Estados Unidos y en gran parte del mundo para el tratamiento de la DM2. La vildagliptina ha sido aprobada para uso en Europa y Am&eacute;rica Latina y la alogliptina para uso en Jap&oacute;n. La linagliptina tambi&eacute;n ha sido aprobada por la FDA y por las agencias regulatorias de otros pa&iacute;ses. Se encuentra disponible en Colombia para uso en pacientes adultos con DM2 para mejorar el control glic&eacute;mico, ya sea como monoterapia o en asociaci&oacute;n con metformina, sulfonilureas o tiazolidinedionas o en asociaci&oacute;n con metformina + sulfonilureas (99). Otros miembros de esta clase de medicamentos se encuentran en fase III de ensayos cl&iacute;nicos, e incluyen dutogliptina y gemigliptina. Los diversos inhibidores de la DPP-4 son &uacute;nicos en su metabolismo, excreci&oacute;n y potencia, y como resultado de lo anterior, en las dosis diarias recomendadas. La saxagliptina, la sitagliptina y la vildagliptina se metabolizan por v&iacute;a hep&aacute;tica y se eliminan por v&iacute;a renal. De manera interesante, la linagliptina se excreta principalmente por v&iacute;as no renales con un m&iacute;nimo de metabolismo hep&aacute;tico, por lo que los ajustes de la dosis no son necesarios en el contexto de enfermedad renal o enfermedad hep&aacute;tica, lo que la convierte en el inhibidor recomendable para este tipo de pacientes con DM2 y enfermedad renal y/o hep&aacute;tica (100). En la <a href="img/revistas/rcca/v20n5/v20n5a6t1.gif" target="_blank">tabla 1</a> se detallan las caracter&iacute;sticas farmacocin&eacute;ticas de los diferentes inhibidores de la DPP-4.</p>     <p><font size="3" face="Verdana"><b>An&aacute;logos de incretinas e inhibidores de la dpp-4 y riesgo cardiovascular</b></font></p>       ]]></body>
<body><![CDATA[<p>Como se anot&oacute;, el Departamento Americano de Salud y Servicios Humanos, a trav&eacute;s de la Administraci&oacute;n de Drogas y Alimentos (FDA) y el Centro para Evaluaci&oacute;n de Drogas e Investigaci&oacute;n (CDER), public&oacute; en diciembre de 2008 las gu&iacute;as para la industria farmac&eacute;utica en el campo espec&iacute;fico de la DM2 y la evaluaci&oacute;n del riesgo cardiovascular de nuevos hipoglicemiantes para el tratamiento de la DM2, cuya principal indicaci&oacute;n es que todos los nuevos medicamentos a registrarse deben demostrar que &quot;no est&aacute;n asociados con un aumento inaceptable en el riesgo cardiovascular&quot;, para lo cual se deben realizar las siguientes acciones (44):</p>       <p>a)	Adjudicaci&oacute;n central ciega de los eventos cardiovasculares durante los ensayos cl&iacute;nicos de fase 2 y 3.    <br>   b)	Los eventos de desenlace deben incluir mortalidad cardiovascular, infarto agudo del miocardio y accidente cerebrovascular.    <br>   c)	Otros posibles desenlaces finales pueden incluir hospitalizaci&oacute;n por s&iacute;ndrome coronario agudo (SCA) y revascularizaci&oacute;n urgente.    <br>   d)	Los ensayos cl&iacute;nicos pueden reclutar individuos de alto riesgo tales como sujetos con falla renal, enfermedad avanzada y pacientes a&ntilde;osos.     <br>   e)	Se recomienda la realizaci&oacute;n de meta-an&aacute;lisis sobre el tema, uniendo estudios cl&iacute;nicos fase 2 y 3.     <br>   f)	Se solicita que los estudios tengan al menos dos a&ntilde;os de duraci&oacute;n en el seguimiento de los pacientes.</p>     <p>De acuerdo con estos criterios, al momento est&aacute;n en marcha varios estudios cl&iacute;nicos en pacientes con DM2 los cuales evaluar&aacute;n los desenlaces cardiovasculares, los mismos que se detallan en la <a href="img/revistas/rcca/v20n5/v20n5a6t2.gif" target="_blank">tabla 2</a>.</p>       <p>En algunos de estos estudios, CAROLINA, ELIXA y REWIND, participan varios centros en Colombia, tanto en la fase de reclutamiento (ELIXA, REWIND) como de seguimiento (CAROLINA). Se espera que los primeros resultados est&eacute;n disponibles dentro de 3 a 4 a&ntilde;os. Mientras se concluyen estos estudios dise&ntilde;ados con el objetivo espec&iacute;fico de evaluar el impacto de los an&aacute;logos de incretinas y los DPP-4 en el riesgo cardiovascular, y de acuerdo con las recomendaciones de la FDA, se han realizado varios meta-an&aacute;lisis que incluyeron los resultados de estudios fases 2 y 3, especialmente de los que utilizaron inhibidores de la DPP-4. Al analizar en forma aislada cada uno de los miembros de la familia de los inhibidores de la DPP-4 se ha mostrado que algunos como linagliptina y saxagliptina disminuyen (101, 102), mientras otros como sitagliptina y vildagliptina no tienen efecto en la incidencia de eventos cardiovasculares (103-5). Un meta-an&aacute;lisis (106) que estudi&oacute; en forma conjunta los resultados de todos los ensayos con inhibidores de la DPP-4, demostr&oacute; una reducci&oacute;n significativa en la incidencia de eventos cardiovasculares mayores en pacientes con DM2. Recientemente (107), los mismos autores del anterior meta-an&aacute;lisis actualizaron la informaci&oacute;n incluyendo los resultados de los nuevos ensayos cl&iacute;nicos fase 2-3 con inhibidores de la DPP-4 que reportaron desenlaces cardiovasculares como infarto agudo del miocardio, accidente cerebrovascular y mortalidad cardiovascular. Este meta-an&aacute;lisis incluy&oacute; los resultados de setenta estudios cl&iacute;nicos aleatorizados con una duraci&oacute;n de al menos 24 semanas, publicados hasta marzo de 2012, que aparecen en Medline y Embase bajo los t&eacute;rminos linagliptina, sitagliptina, saxagliptina, alogliptina y detagliptina, reclutaron pacientes con DM2 y compararon un inhibidor de la DPP-4 contra placebo u otras drogas hipoglucemiantes orales o insulina. En total, estos estudios recogieron 41.959 pacientes, de los cuales 45 fueron contra placebo y 18 contra una droga activa y 7 tuvieron los dos brazos: contra placebo y contra droga activa. Siete ensayos no reportaron desenlaces por lo que fueron excluidos del an&aacute;lisis. Al final, el reporte incluy&oacute; 23.451 pacientes tratados con inhibidores de la DPP-4 y 16.962 sujetos con brazo placebo o comparador activo. Se reportaron 263 eventos (1,12%) en el grupo de inhibidores de la DPP-4 y 232 (1,36%) en el grupo de comparaci&oacute;n, cifras que demuestran que el uso de los inhibidores de la DPP-4 estuvo asociado con una disminuci&oacute;n significativa en el riesgo de eventos cardiovasculares mayores (ECVM) a pesar del peque&ntilde;o n&uacute;mero de desenlaces cardiovasculares. El an&aacute;lisis de sensibilidad con correcci&oacute;n continua (tasa de confianza Mantel-Haenzel), demostr&oacute; resultados similares (MH-OR para ECVM 0,71; 0,59-0,86 con cualquier inhibidor de la DPP-4 vs. cualquier comparador). Vale destacar que los estudios cl&iacute;nicos del meta-an&aacute;lisis fueron dise&ntilde;ados para evaluar efectividad metab&oacute;lica (HbA1C) y seguridad, por lo que si bien el meta-an&aacute;lisis es sugestivo de un efecto beneficioso de los inhibidores de la DPP-4 sobre los ECVM, ser&aacute; preciso esperar los resultados de los ensayos cl&iacute;nicos enumerados en la tabla 2, que fueron espec&iacute;ficamente dise&ntilde;ados para evaluar el efecto de los inhibidores de la DPP-4 en los desenlaces cardiovasculares.</p>       <p>A pesar de los efectos pleiotr&oacute;picos beneficiosos de los an&aacute;logos de GLP-1 sobre el sistema cardiovascular, no existen al momento estudios finalizados que demuestren, en forma definitiva, el efecto sobre los ECVM. </p>       ]]></body>
<body><![CDATA[<p>En un an&aacute;lisis retrospectivo (108) de la base de datos de pacientes que recib&iacute;an  exenatide, se demostr&oacute; que estos sujetos tuvieron menores posibilidades de tener un ECVM (HR 0,81, p&lt;0,01) y menores tasas de hospitalizaciones relacionadas con enfermedades cardiovasculares (HR 0,88, p&lt;0,02). As&iacute; mismo, en un meta-an&aacute;lisis que evalu&oacute; los desenlaces de ECVM de los agonistas de GLP-1 (109), se demostr&oacute; una disminuci&oacute;n significativa de ECVM en relaci&oacute;n con el grupo que recibi&oacute; placebo. Sin embargo, por lo que se infiere de estos resultados, las limitaciones metodol&oacute;gicas del an&aacute;lisis retrospectivo y del meta-an&aacute;lisis no permiten tener evidencias definitivas sobre el efecto beneficioso de los an&aacute;logos de GLP-1 en los ECVM en el paciente con DM2, y de ah&iacute; las enormes expectativas que se tienen frente a los resultados que arrojen los ensayos cl&iacute;nicos actualmente en curso.</p>     <p><font size="3" face="Verdana"><b>Conclusiones</b></font></p>       <p>La introducci&oacute;n en el mercado de los agonistas de GLP-1 y los inhibidores de la DPP-4 para el manejo de los pacientes con DM2, ha permitido reconocer la importancia que tiene el eje incretino-insular en la fisiopatolog&iacute;a de la DM2, pero adem&aacute;s ha abierto una nueva opci&oacute;n terap&eacute;utica para el manejo en monoterapia o terapia combinada que permite un control metab&oacute;lico apropiado de los pacientes con DM2.</p>       <p>La reciente disponibilidad en el mercado colombiano de un nuevo inhibidor de la DPP-4, la linagliptina, la cual no tiene una ruta de excreci&oacute;n renal y es eliminada de forma no modificada por las heces fecales, la hace un medicamento seguro para su utilizaci&oacute;n en diab&eacute;ticos con alteraci&oacute;n de la funci&oacute;n renal. Adem&aacute;s, su eficacia y seguridad ha sido probada en diferentes poblaciones, caracter&iacute;sticas que la convierten en una opci&oacute;n atractiva para uso en poblaciones con caracter&iacute;sticas &eacute;tnicas y socioecon&oacute;micas diversas, hecho importante de frente a la propuesta de la existencia de diferencias regionales en la epidemiolog&iacute;a, el diagn&oacute;stico, las complicaciones y el tratamiento de la DM2 (9-11). La respuesta confirmatoria de si este inhibidor de la DPP-4 es tan efectivo para la reducci&oacute;n de los ECVM en pacientes con DM2, como lo han demostrado los meta-an&aacute;lisis previamente revisados, s&oacute;lo estar&aacute; disponible en los pr&oacute;ximos a&ntilde;os cuando termine el seguimiento de los pacientes incluidos en el estudio CAROLINA, en el cual se reclut&oacute; un importante n&uacute;mero de pacientes colombianos.</p>       <p><b><i>CONFLISTOS DE INTER&Eacute;S</i></b>: Patricio L&oacute;pez-Jaramillo ha recibido grants para la investigaci&oacute;n de Astra-Zeneca y Pfizer. Ha sido consultor de Boehringer Ingelheim, Sanofi y Aventis y ha recibido honorarios por conferencista de Merck, Boehringer Ingelheim, Sanofi Aventis, Synthesis, MSD y Pfizer. Los dem&aacute;s autores no declaran conflicto de inter&eacute;s.</p>     <p><font size="3" face="Verdana"><b>Bibliograf&iacute;a</b></font></p>       <!-- ref --><p>1.	Danaei, G, et al. National, regional, and global trends in fasting plasma glucose and diabetes prevalence since 1980: systematic analysis of health examination surveys and epidemiological studies with 370 country-years and 2.7 million participants. Lancet 2011; 378: 31-40.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000089&pid=S0120-5633201300050000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>       <!-- ref --><p>2.	Group of Diabetes Mellitus and Cardiovascular Disease of the Spanish Diabetes Society. Diabetes mellitus and cardiovascular risk. Recommendations of the working group of Diabetes Mellitus and Cardiovascular Disease of the Spanish Diabetes Society 2009. Clin Invest Arterioscl. 2010; 22: 115-121.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000091&pid=S0120-5633201300050000600002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>       ]]></body>
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