<?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>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422011000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Hígado graso y esteatohepatitis no alcohólica: Conceptos Actuales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo Esper]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muciño Bermejo]]></surname>
<given-names><![CDATA[Jimena]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Fundación Clínica Médica Sur  ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Fundación Clínica Médica Sur  ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</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>54</volume>
<numero>3</numero>
<fpage>29</fpage>
<lpage>45</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422011000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422011000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422011000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El hígado graso no alcohólico (HGNA) incluye dentro de su presentación evolutiva a la esteatosis hepática, esteatohepatitis no alcohólica (EHNA), cirrosis y hepatocarcinoma. Se relaciona a obesidad, preferentemente abdominal, diabetes mellitus tipo II y síndrome metabólico (SM). En su fisiopatología están involucrados la sobrenutrición, vida sedentaria, factores genéticos y resistencia a la insulina. Su prevalencia es del 17 al 33%. La EHNA se presenta en el 30% de estos casos, de los cuales un 20 a 25% evoluciona a hepatocarcinoma. El HGNA es una de las causas más frecuentes de alteraciones en las pruebas de función hepática en pacientes asintomáticos. En su fase inicial, se caracteriza por malestar abdominal, fatiga, elevación de alanin aminotransferasa (AAT), gamaglutamil transpeptidasa (GGT), hepatomegalia, e hiperecogenicidad hepática en el ultrasonido. No es una enfermedad benigna, ya que el 32% de los enfermos progresan a fibrosis, el 20% a cirrosis y el riesgo de muerte relacionada a disfunción hepática es del 12% a 10 años. Las alternativas terapéuticas están dirigidas a modificar el estilo de vida, la dieta y el empleo de medicamentos, que en conjunto impactan en la fisiopatología de la enfermedad, en especial en la resistencia a la insulina y SM.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Non-Alcoholic Fatty Liver Disease (NAFLD) includes hepatic steatosis, non-alcoholic steatohepatitis (NASH), cirrhosis, and hepatocellular carcinoma in its clinical presentation and evolution. It is related to obesity, especially abdominal, type 2 diabetes mellitus, and Metabolic Syndrome (SM). Overnutrition, sedentarism, genetic factors, and insulin resistance have been involved in its physiopathology. The prevalence of NAFLD ranges from 17 to 33%. NASH is present in 30% of these cases, 20 to 25% of which become hepatocellular carcinoma. NAFLD is one of the most frequent causes of alterations in hepatic function tests in asymptomatic patients. In its early stage, its main features are abdominal discomfort, fatigue, alanine-aminotransferase (ALAT) increase, gamma-glutamyl transpeptidase (GGT), hepatomegaly, and hepatic hyperechogenicity on ultrasound scan. It is not a benign disease, since 32% of patients develop fibrosis, 20% fibrosis, and death risk related to hepatic dysfunction is 12% at 10 years. Therapeutic alternatives aim at modifying the life style and diet, and also include the prescription of drugs, all this affects the disease physiopathology, especially insulin resistance and metabolic syndrome.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hígado graso no alcohólico]]></kwd>
<kwd lng="es"><![CDATA[esteatohepatitis no alcohólica]]></kwd>
<kwd lng="es"><![CDATA[obesidad]]></kwd>
<kwd lng="es"><![CDATA[resistencia a la insulina]]></kwd>
<kwd lng="es"><![CDATA[síndrome metabólico]]></kwd>
<kwd lng="en"><![CDATA[Non-alcoholic fatty liver disease]]></kwd>
<kwd lng="en"><![CDATA[non-alcoholic steatohepatitis]]></kwd>
<kwd lng="en"><![CDATA[obesity]]></kwd>
<kwd lng="en"><![CDATA[insulin resistance]]></kwd>
<kwd lng="en"><![CDATA[metabolic syndrome]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>  	    <p align="justify">&nbsp;</p>     <p align="center"><font face="verdana" size="4"><b>H&iacute;gado graso y esteatohepatitis no alcoh&oacute;lica. Conceptos Actuales</b></font></p>     <p align="center">&nbsp;</p> 	    <p align="center"><font face="verdana" size="2"><b>Ra&uacute;l Carrillo Esper<sup>a</sup>, Jimena Muci&ntilde;o Bermejo<sup>b</sup></b></font></p> 	    <p align="center">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><sup><i>a </i></sup><i>Jefe del Servicio de Terapia Intensiva. Fundaci&oacute;n Cl&iacute;nica M&eacute;dica Sur. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> M&eacute;dico Residente de Medicina Interna. Fundaci&oacute;n Cl&iacute;nica M&eacute;dica Sur.</i></font></p>     <p align="center">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>      <p align="justify"><font face="verdana" size="2">El h&iacute;gado graso no alcoh&oacute;lico (HGNA) incluye dentro de su presentaci&oacute;n evolutiva a la esteatosis hep&aacute;tica, esteatohepatitis no alcoh&oacute;lica (EHNA), cirrosis y hepatocarcinoma. Se relaciona a obesidad, preferentemente abdominal, diabetes mellitus tipo II y s&iacute;ndrome metab&oacute;lico (SM). En su fisiopatolog&iacute;a est&aacute;n involucrados la sobrenutrici&oacute;n, vida sedentaria, factores gen&eacute;ticos y resistencia a la insulina. Su prevalencia es del 17 al 33%. La EHNA se presenta en el 30% de estos casos, de los cuales un 20 a 25% evoluciona a hepatocarcinoma. El HGNA es una de las causas m&aacute;s frecuentes de alteraciones en las pruebas de funci&oacute;n hep&aacute;tica en pacientes asintom&aacute;ticos. En su fase inicial, se caracteriza por malestar abdominal, fatiga, elevaci&oacute;n de alanin aminotransferasa (AAT), gamaglutamil transpeptidasa (GGT), hepatomegalia, e hiperecogenicidad hep&aacute;tica en el ultrasonido. No es una enfermedad benigna, ya que el 32% de los enfermos progresan a fibrosis, el 20% a cirrosis y el riesgo de muerte relacionada a disfunci&oacute;n hep&aacute;tica es del 12% a 10 a&ntilde;os. Las alternativas terap&eacute;uticas est&aacute;n dirigidas a modificar el estilo de vida, la dieta y el empleo de medicamentos, que en conjunto impactan en la fisiopatolog&iacute;a de la enfermedad, en especial en la resistencia a la insulina y SM.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> H&iacute;gado graso no alcoh&oacute;lico, esteatohepatitis no alcoh&oacute;lica, obesidad, resistencia a la insulina, s&iacute;ndrome metab&oacute;lico.</font></p>  	    <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>      <p align="justify"><font face="verdana" size="2">Non&#45;Alcoholic Fatty Liver Disease (NAFLD) includes hepatic steatosis, non&#45;alcoholic steatohepatitis (NASH), cirrhosis, and hepatocellular carcinoma in its clinical presentation and evolution. It is related to obesity, especially abdominal, type 2 diabetes mellitus, and Metabolic Syndrome (SM). Overnutrition, sedentarism, genetic factors, and insulin resistance have been involved in its physiopathology. The prevalence of NAFLD ranges from 17 to 33%. NASH is present in 30% of these cases, 20 to 25% of which become hepatocellular carcinoma. NAFLD is one of the most frequent causes of alterations in hepatic function tests in asymptomatic patients. In its early stage, its main features are abdominal discomfort, fatigue, alanine&#45;aminotransferase (ALAT) increase, gamma&#45;glutamyl transpeptidase (GGT), hepatomegaly, and hepatic hyperechogenicity on ultrasound scan. It is not a benign disease, since 32% of patients develop fibrosis, 20% fibrosis, and death risk related to hepatic dysfunction is 12% at 10 years. Therapeutic alternatives aim at modifying the life style and diet, and also include the prescription of drugs, all this affects the disease physiopathology, especially insulin resistance and metabolic syndrome.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key Words:</b> Non&#45;alcoholic fatty liver disease, non&#45;alcoholic steatohepatitis, obesity, insulin resistance, metabolic syndrome.</font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="center"><img src="/img/revistas/facmed/v54n3/a5i1.jpg"></p> 	    <p align="justify"><font face="verdana" size="2">En 1980, Ludwig, acu&ntilde;&oacute; el t&eacute;rmino esteatohepatitis no alcoh&oacute;lica (EHNA) al describir una serie de 20 pacientes sin antecedente de ingesta de alcohol, con datos bioqu&iacute;micos e histol&oacute;gicos compatibles con hepatitis alcoh&oacute;lica.<sup>1</sup></font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Actualmente se reconoce a la esteatohepatitis como parte del espectro del h&iacute;gado graso no alcoh&oacute;lico (HGNA) la hepatopat&iacute;a cr&oacute;nica m&aacute;s prevalente en Estados Unidos y muchas partes del mundo.<sup>1</sup> El objetivo del presente trabajo es dar a conocer a la comunidad m&eacute;dica los conceptos m&aacute;s relevantes relacionados al HGNA.</font></p>     <p align="center"><img src="/img/revistas/facmed/v54n3/a5i2.jpg"></p>     <p align="center"><img src="/img/revistas/facmed/v54n3/a5t0.jpg"></p>     <p align="justify">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><b>EPIDEMIOLOG&Iacute;A</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Seg&uacute;n el m&eacute;todo diagn&oacute;stico, la frecuencia del HGNA es del 3 al 36.9% en poblaci&oacute;n general. Es m&aacute;s prevalente en pacientes en la cuarta a sexta d&eacute;cadas de la vida, de g&eacute;nero masculino, raza hispana o con s&iacute;ndrome metab&oacute;lico (SM).<sup>1</sup> Un estudio multic&eacute;ntrico que utiliz&oacute; resonancia magn&eacute;tica para el diagn&oacute;stico de esteatosis, encontr&oacute; una prevalencia de 45% de poblaci&oacute;n hispana, 33% de poblaci&oacute;n aria, 24% de afroamericanos, 42% de hombres y 24% de mujeres<sup>2</sup> La incidencia de h&iacute;gado graso en poblaci&oacute;n adulta en la Ciudad de M&eacute;xico es de 14%.<sup>2</sup></font></p>     <p align="justify"><font face="verdana" size="2">En Estados Unidos, la tercera Encuesta Nacional de Salud y Nutrici&oacute;n<sup>3</sup> report&oacute; que 23% de la poblaci&oacute;n general presentaba elevaciones de aminotransferasas sin causa aparente, y, probablemente, presenten HGNA. Los determinantes asociados a la elevaci&oacute;n de aspartato aminotransferasa (ALT) fueron el sobrepeso y la obesidad central. En Jap&oacute;n,3 un estudio de cohorte, que utiliz&oacute; la elevaci&oacute;n de aminotransferasas como marcador de HGNA estim&oacute; una incidencia en 3/1000 personas a&ntilde;o, identificando al aumento de peso como evento precedente. Un estudio transversal que evaluaba por cl&iacute;nica, ultrasonido y laboratorio la presencia de HGNA y/o SM, encontr&oacute; una prevalencia de 11.7% de la poblaci&oacute;n adulta (18% hombres, 16.7 mujeres, p = 0.05), 1.7% de las personas entre 7 y 18 a&ntilde;os, y una prevalencia significativamente mayor en &aacute;reas urbanas (23%) que en rurales (12.9%). La glicemia en ayuno alterada, y/o dislipidemia combinada, fueron los factores m&aacute;s relacionados al desarrollo de HGNA.<sup>3</sup> Otro estudio transversal, realizado en poblaci&oacute;n adulta<sup>3</sup> evalu&oacute; la presencia HGNA y/o SM mediante cl&iacute;nica, pruebas de funci&oacute;n hep&aacute;tica y ultrasonograf&iacute;a; 35.2% presentaban HGNA, y 25.9% SM. Los niveles elevados de glucosa en ayuno,(102 &plusmn; 38.8 mg/dl) colesterol total (231.9 &plusmn; 37.2 mg/dl) y lipoprote&iacute;nas de muy baja densidad (LMBD) (35 &plusmn; 12 mg/dl) en conjunto, se correlacionaban con la presencia de esteatosis hep&aacute;tica grado II&#45;III.</font></p>     <p align="justify"><font face="verdana" size="2">De Lusong<sup>3</sup> report&oacute; una prevalencia de HGNA de 12.2% en una poblaci&oacute;n adulta en Filipinas. La poblaci&oacute;n afectada ten&iacute;a una edad promedio de 42.2 a&ntilde;os; 71% eran mujeres, 60% proven&iacute;an de &aacute;reas urbanas, 60% presentaban &iacute;ndice de masa corporal (IMC) mayor a 30, y 9% ten&iacute;an sobrepeso.</font></p>  	    <p align="justify"><font face="verdana" size="2">Radu<sup>4</sup> investig&oacute; la prevalencia de HGNA/ EHNA mediante ultrasonograf&iacute;a (US) en pacientes hospitalizados por problemas gastrointestinales, sin historia de ingesta de alcohol, enfermedad de Wilson, cirug&iacute;a gastrointestinal, enteropat&iacute;a hep&aacute;tica, o ingesta de f&aacute;rmacos hepatot&oacute;xicos; encontr&oacute; una prevalencia de EHNA de 20%, con una prevalencia de 32.7% entre aquellos pacientes con sobrepeso u obesidad (p &gt; 0.001).</font></p>     <p align="justify"><font face="verdana" size="2">De los pacientes con HGNA: 88.4% reportaron al menos un criterio de SM, 88.4% presentaban obesidad central, 68.87% ten&iacute;an intolerancia a la glucosa/diabetes, 62,58% eran hipertensos, 56.16%, con hipertrigliceridemia, 38.78% ten&iacute;an concentraci&oacute;n de lipoprote&iacute;nas de alta densidad (HDL) baja, 61.09% cumpl&iacute;an al menos 3 criterios de SM y 14.07% cumpl&iacute;an los 5 criterios.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En pacientes pedi&aacute;tricos, la esteatohepatitis se est&aacute; convirtiendo en la principal causa de referencia a un especialista; 42% de los escolares mexicanos con sobrepeso/obesidad, tienen elevaci&oacute;n de ALT. Durante la pubertad, se presenta resistencia fisiol&oacute;gica a la insulina que, en p&uacute;beres obesos, puede desencadenar el desarrollo de diabetes mellitus (DM)2/ HGNA; 1/3 de los p&uacute;beres obesos jam&aacute;s recuperan la sensibilidad normal a la insulina.<sup>4</sup></font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>ETIOLOG&Iacute;A</b></font></p>      <p align="justify"><font face="verdana" size="2">Las entidades asociadas a HGNA se enumeran en la <b><a href="/img/revistas/facmed/v54n3/a5t1.jpg" target="_blank">tabla 1</a>.</b> Los componentes del SM (entre ellos, la obesidad) son factores de riesgo asociados a HGNA:</font></p>  	    <blockquote> 	      <p align="justify"><font face="verdana" size="2">&bull; 80% de los pacientes obesos presentan HGNA. En pacientes sometidos a cirug&iacute;a bari&aacute;trica, la prevalencia por biopsia, es de 86% de esteatosis, 74% de fibrosis, 24% de EHNA y 2% de cirrosis. Existe una correlaci&oacute;n entre el IMC y el grado de esteatosis, y la cantidad de grasa visceral e intrabdominal (marcadores de resistencia a la insulina) son mejores predictores de esteatosis hep&aacute;tica que la grasa corporal total.<sup>4</sup></font></p> 	      <p align="justify"><font face="verdana" size="2">&bull; En adultos con hiperlipidemia, 64% presentan elevaci&oacute;n de enzimas hep&aacute;ticas (47% ALT, 45% GGT), y 50% presentan cambios ultra&#45;sonog&aacute;ficos de EHNA. Existe una asociaci&oacute;n entre la hipertrigliceridemia severa y/o la hiperlipidemia mixta con la aparici&oacute;n de HGNA por US. La hiperglicemia es un predictor de cambios ultrasonogr&aacute;ficos de HGNA.<sup>4</sup></font></p> 	      <p align="justify"><font face="verdana" size="2">&bull; 75% de los pacientes con HGNA presentan intolerancia a la glucosa y/o DM; &eacute;sta ultima podr&iacute;a ser un factor pron&oacute;stico de progresi&oacute;n a cirrosis y/o carcinoma hepatocelular (CHC).</font></p> </blockquote>     <p align="justify"><font face="verdana" size="2">Tambi&eacute;n se ha documentado mayor incidencia de HGNA en otros escenarios que condicionan incremento del aporte hep&aacute;tico de &aacute;cidos grasos, como derivaci&oacute;n biliopancre&aacute;tica, resecci&oacute;n extensa del intestino delgado, cortocircuito g&aacute;strico, cortocircuito yeyunoileal, enfermedad inflamatoria intestinal, diverticulosis yeyunal con sobrecrecimiento bacteriano, anemia grave y nutrici&oacute;n parenteral total.</font></p>  	    <p align="justify">&nbsp;</p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>FISIOPATOLOG&Igrave;A</b></font></p>      <p align="justify"><font face="verdana" size="2">Actualmente se emplea el modelo de "doble golpe" propuesto por Day y James. El primer golpe al hepatocito es la disregulaci&oacute;n del metabolismo de los &aacute;cidos grasos, y el segundo est&aacute; dado por alteraciones gen&eacute;ticas o ambientales que provocan inflamaci&oacute;n, necrosis y activaci&oacute;n de la cascada fibrog&eacute;nica <b>(<a href="/img/revistas/facmed/v54n3/a5f1.jpg" target="_blank">figura 1</a>).</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En el hepatocito, los &aacute;cidos grasos libres (AGL) son oxidados en la mitocondria, esterificados a triglic&eacute;ridos y convertidos en fosfol&iacute;pidos y &eacute;steres de colesterol, para ser secretados como lipoprote&iacute;nas de muy baja densidad (LMBD). Cuando los triglic&eacute;ridos se acumulan en el h&iacute;gado, aparece la esteatosis hep&aacute;tica, caracter&iacute;stica histol&oacute;gica distintiva del HGNA.</font></p>     <p align="justify"><font face="verdana" size="2">Al incrementar el aporte de AGL al h&iacute;gado, estos act&uacute;an como ligandos para el factor de transcripci&oacute;n PPAR&#45;&#945;, y aumenta la oxidaci&oacute;n de &aacute;cidos grasos en la mitocondria, microsomas peroxisomas; los productos de la oxidaci&oacute;n de AGL, (per&oacute;xido de hidr&oacute;geno, super&oacute;xido y per&oacute;xidos lip&iacute;dicos) generan peroxidaci&oacute;n lip&iacute;dica y estr&eacute;s oxidativo.</font></p>  	    <p align="justify"><font face="verdana" size="2">El estr&eacute;s oxidativo genera disminuci&oacute;n de 50% en la actividad enzim&aacute;tica de la cadena respiratoria incrementando la relaci&oacute;n ADP/ATP, lo que la peroxidaci&oacute;n lip&iacute;dica. Algunos productos intermedios de la peroxidaci&oacute;n lip&iacute;dica (malonildealdehido y 4&#45;hidroxinoneal) son quimiot&aacute;cticos de neutr&oacute;filos, estimulan las c&eacute;lulas estelares hep&aacute;ticas y aumentan la secreci&oacute;n del factor transformador de crecimiento beta (TGF<b>&#45;</b>&#946;), provocando inflamaci&oacute;n y fibrosis <b>(<a href="/img/revistas/facmed/v54n3/a5f2.jpg" target="_blank">figura 2</a>).</b></font></p>     <p align="justify"><font face="verdana" size="2">Los pacientes con HGNA presentan menor capacidad para generar antioxidantes y sistemas de depuraci&oacute;n de especies reactivas de ox&iacute;geno (ERO). Adem&aacute;s, tienen menor secreci&oacute;n de apo&szlig; postprandial y defectos en la lipidaci&oacute;n de esta lipoprote&iacute;na, lo que aumenta su susceptibilidad a la hepatotoxicidad inducida por amiodarona o tetraciclina.</font></p>  	    <p align="justify"><font face="verdana" size="2">En situaciones de estr&eacute;s biol&oacute;gico (exceso de l&iacute;pidos, hipoxia, hiperinsulinemia), existe una respuesta del ret&iacute;culo endopl&aacute;smico que incluye activaci&oacute;n de prote&iacute;nas que causan resistencia a la insulina, apoptosis mediada por caspasa 4, inflamaci&oacute;n mediada por el factor nuclear kB (NF&#45;kB) y disfunci&oacute;n mitocondrial.</font></p>  	    <p align="justify"><font face="verdana" size="2">La deficiencia de &aacute;cido pantot&eacute;nico, el consumo excesivo de alcohol y la deficiencia de coenzima A (que puede ocasionarse por &aacute;cido valproico o aspirina) dan lugar a una beta oxidaci&oacute;n defectuosa de los AGL. La malnutrici&oacute;n proteica, la deficiencia de colina o abetalipoproteinemia generan defectos en la secreci&oacute;n o s&iacute;ntesis de LMBD.</font></p>  	    <p align="justify"><font face="verdana" size="2">La resistencia a la insulina incrementa la lip&oacute;lisis perif&eacute;rica, s&iacute;ntesis de triglic&eacute;ridos, y captaci&oacute;n hep&aacute;tica de &aacute;cidos grasos<sup>4</sup> En pacientes con EHNA, se ha documentado menor supresi&oacute;n de la producci&oacute;n de glucosa y &aacute;cidos grasos en respuesta a la insulina, independientemente del IMC o la grasa corporal total.<sup>5</sup> Al comparar el HGNA con los criterios ATP&#45;III para SM, indicadores de SM, el HGNA tiene una sensibilidad de 73%, valor predictivo positivo de 81% y negativo de 87%.<sup>6</sup> La insulina puede tener efectos nocivos al h&iacute;gado al generar estr&eacute;s oxidativo, aumentar la expresi&oacute;n de una prote&iacute;na lipog&eacute;nica llamada SREBP <i>(sterol regulatory element&#45;binding protein)</i> y estimular el desarrollo de tejido conectivo, en presencia de hiperglicemia.<sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2">El tejido adiposo secreta hormonas y citocinas que modulan la resistencia a la insulina y cascada inflamatoria, en el HGNA.</font></p>  	    ]]></body>
<body><![CDATA[<blockquote> 	      <p align="justify"><font face="verdana" size="2">1. La leptina condiciona resistencia a la insulina en los hepatocitos. Los modelos animales deficientes de leptina, presentan obesidad masiva, y no desarrollan fibrosis hep&aacute;tica ante un est&iacute;mulo necroinflamatorio.<sup>8</sup></font></p> 	      <p align="justify"><font face="verdana" size="2">En pacientes con HGNA y fibrosis existen niveles elevados de leptina, pero no hay una relaci&oacute;n estad&iacute;sticamente significativa entre el grado de fibrosis y los niveles de leptina al descartar confusores como edad, g&eacute;nero, &iacute;ndice de masa corporal, diabetes y resistencia a la insulina.<sup>9</sup> Los pacientes con HGNA, tienen altos niveles de leptina y bajos del receptor soluble a leptina, sugiriendo resistencia a la leptina.<sup>10</sup> </font></p> 	      <p align="justify"><font face="verdana" size="2">2. La adiponectina,<sup>11</sup> disminuye la producci&oacute;n hep&aacute;tica de factor de necrosis tumoral alfa (TNFa) y ejerce efectos antag&oacute;nicos en los receptores tisulares del mismo. La administraci&oacute;n de adiponectina inhibe la producci&oacute;n hep&aacute;tica de glucosa y favorece la disminuci&oacute;n de los niveles plasm&aacute;ticos de &aacute;cidos grasos y su betaoxidaci&oacute;n en m&uacute;sculo. Los niveles de adiponectina son significativamente menores en pacientes con HGNA, y existe una correlaci&oacute;n inversa entre niveles de adiponectina y resistencia a la insulina.<sup>12</sup></font></p> 	      <p align="justify"><font face="verdana" size="2">3. El TNF&#945; es una citocina proinflamatoria relacionada a la resistencia a la insulina; se encuentra elevada en pacientes con EHNA,<sup>13</sup> pero tiene menor correlaci&oacute;n con el desarrollo de EHNA que la hipoadiponectinemia.<sup>14</sup></font></p> 	      <p align="justify"><font face="verdana" size="2">4. La resistina,15 prote&iacute;na sintetizada en el tejido adiposo y macr&oacute;fagos,<sup>16</sup> se ha relacionado a la resistencia a la insulina y exacerbaci&oacute;n de la respuesta inflamatoria. Se encuentra elevada en pacientes con HGNA, y sus niveles se correlacionan con el grado histol&oacute;gico de esteatohepatitis.<sup>17</sup></font></p> </blockquote>      <p align="justify"><font face="verdana" size="2">El angiotensin&oacute;geno II probablemente juega un papel importante en la fisiopatolog&iacute;a de HGNA, ya que sus antagonistas mejoran las pruebas de funci&oacute;n hep&aacute;tica y aten&uacute;an la fibrosis en modelos experimentales.<sup>14</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Hasta 30% de los pacientes con HGNA tienen altos niveles s&eacute;ricos de ferritina, y se ha encontrado asociaci&oacute;n entre la hiperferritinemia y resistencia a la insulina, as&iacute; como los niveles de hierro hep&aacute;tico con el grado de fibrosis,<sup>18</sup> pero no se ha demostrado correlaci&oacute;n entre los niveles de hierro y la mortalidad, o progresi&oacute;n a cirrosis en pacientes con EHNA. En pacientes con EHNA, hay una mayor prevalencia de heterocigocidad para la mutaci&oacute;n responsable de la hemocromatosis, pero la homocigocidad no incrementa el riesgo de HGNA.<sup>19</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los pacientes con EHNA tienen sobrecrecimiento bacteriano en intestino delgado en comparaci&oacute;n con individuos controles, lo que contribuye al desarrollo de esteatohepatitis debido a la capacidad de las bacterias y levaduras para generar etanol y acetaldeh&iacute;do, desconjugaci&oacute;n de sales biliares, inactivaci&oacute;n de lipotropos hep&aacute;ticos, incluyendo colina, y liberaci&oacute;n de citocinas (TNF&#945;, IL&#45;6, IL&#45;8) mediada por endotoxinas y lipopolisac&aacute;rido.</font></p>      <p align="justify"><font face="verdana" size="2">En pacientes con EHNA, el desarrollo de fibrosis perisinusoidal es consecuencia de un proceso inflamatorio cr&oacute;nico que activa a las c&eacute;lulas estelares hep&aacute;ticas. Los mecanismos de activaci&oacute;n de esas c&eacute;lulas incluyen aumento en la producci&oacute;n hep&aacute;tica de factor transformador de crecimiento beta (TGF&#45;&#945;) en respuesta a los productos de peroxidaci&oacute;n lip&iacute;dica, liberaci&oacute;n de factor de crecimiento derivado de plaquetas (PDGF) y TGF&#45;&#945;. Tambi&eacute;n liberaci&oacute;n de factor de crecimiento de tejido conectivo (CTGF), una mol&eacute;cula profibrog&eacute;nica, mediada por hiperinsulinemia, y aumento en la producci&oacute;n de TGF&#45;&#945; en las c&eacute;lulas de Kupffer y endotelio sinusoidal inducido por leptina.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En pacientes con enfermedad pulmonar obstructiva cr&oacute;nica (EPOC) la hipoxia cr&oacute;nica intermitente se relaciona con un aumento en los niveles hep&aacute;ticos de peroxidaci&oacute;n lip&iacute;dica y citocinas proinflamatorias, inflamaci&oacute;n lobular y fibrosis hep&aacute;tica <b>(<a href="/img/revistas/facmed/v54n3/a5f3.jpg" target="_blank">figura 3</a>).</b></font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>HISTORIA NATURAL</b></font></p>      <p align="justify"><font face="verdana" size="2">La mayor&iacute;a de los pacientes con esteatosis hep&aacute;tica permanecen estables. De los pacientes con esteatohepatitis 25 a 35% progresan a fibrosis, 65&#45;75% permanecen estables o presentan regresi&oacute;n de la fibrosis y 9 a 20% progresan a cirrosis<sup>1</sup> <b>(<a href="/img/revistas/facmed/v54n3/a5f4.jpg" target="_blank">figura 4</a>).</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se ha encontrado que hay una mayor incidencia de SM, obesidad, y DM2 en pacientes con cirrosis hep&aacute;tica criptog&eacute;nica que en pacientes con cirrosis secundaria a virus de hepatitis C, alcohol o hepatitis autoinmune, probablemente estos casos de "cirrosis criptog&eacute;nica" correspondan en realidad a estadios avanzados de HGNA.<sup>20</sup></font></p>     <p align="justify"><font face="verdana" size="2">En los primeros 5 a&ntilde;os tras el diagn&oacute;stico de cirrosis asociada a EHNA, 40% de los pacientes presentan complicaciones de cirrosis, y 62% lo har&aacute;n en los primeros 7 a&ntilde;os. Este curso cl&iacute;nico es similar al de los pacientes con cirrosis por VHC, pero con mayor mortalidad; 33% a 7 a&ntilde;os, con una sobrevida de 9.3 meses tras el diagn&oacute;stico de cirrosis.<sup>21</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">No se ha establecido si el carcinoma hepatocelular (CHH) forma parte de los desenlaces posibles de la HGNA; se ha descrito una asociaci&oacute;n entre EHNA y desarrollo de CHC. En pacientes con cirrosis no atribuible a alcohol o virus C, se ha reportado con mayor frecuencia componentes del SM sugerentes de EHNA (hipertrigliceridemia, diabetes), y valores normales de aminotransferasas.<sup>22</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Se ha descrito que 10% de los pacientes con cirrosis relacionada a EHNA desarrollan CHC tras 7 a&ntilde;os de seguimiento.<sup>30</sup> A mayor edad, menores concentraciones s&eacute;ricas de AST y menor &iacute;ndice de actividad histol&oacute;gica son factores de riesgo para el desarrollo de CHC en pacientes con EHNA con fibrosis avanzada.<sup>23</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">La poblaci&oacute;n con HGNA tiene una sobrevida menor a la poblaci&oacute;n sana; los factores de riesgo para progresi&oacute;n de la enfermedad/mortalidad incluyen alteraciones en la glucosa en ayuno, diabetes mellitus, mayor &iacute;ndice de masa corporal, y mayor edad.<sup>24,25</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Independientemente de la progresi&oacute;n de la enfermedad hep&aacute;tica, los pacientes con HGNA tienen un mayor riesgo de otras complicaciones relacionadas con diferentes componentes del SM. Los pacientes con HGNA diagnosticado mediante ultrasonido a&uacute;n con pruebas de funci&oacute;n hep&aacute;tica con alteraciones m&iacute;nimas tienen una mayor prevalencia de placas de aterosclerosis carot&iacute;dea;<sup>26</sup> La presencia de HGNA es un factor predictor de riesgo de infarto agudo al miocardio, s&iacute;ndromes coronarios agudos, eventos cerebrovasculares isqu&eacute;micos o hemorr&aacute;gicos independientemente de otros factores de riesgo cardiovascular.<sup>27</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los factores que dificultan la caracterizaci&oacute;n de la evoluci&oacute;n del HGNA son:</font></p>  	    <blockquote> 	      <p align="justify"><font face="verdana" size="2">1. La biopsia hep&aacute;tica, estudio de elecci&oacute;n para estadificaci&oacute;n del HGNA que puede tener una diferencia de hasta un grado de fibrosis entre 2 muestras simult&aacute;neas de un mismo paciente en 41% de los casos.<sup>28</sup> En los estudios de biopsias pareadas, existe un sesgo de selecci&oacute;n, un intervalo variable entre biopsias, falta de correlaci&oacute;n con la progresi&oacute;n de los otros factores de riesgo metab&oacute;lico, y cuentan con un periodo de seguimiento m&aacute;ximo de 5.6 a&ntilde;os.<sup>28</sup></font></p> 	      <p align="justify"><font face="verdana" size="2">2. Estudios no invasivos, como el ultrasonido, pueden aparecer normales en pacientes con grados m&iacute;nimos de esteatosis.</font></p> 	      <p align="justify"><font face="verdana" size="2">3. Marcadores bioqu&iacute;micos, como las pruebas de funci&oacute;n hep&aacute;tica, pueden fluctuar con el tiempo, alterarse por motivos diferentes a HGNA o estar en par&aacute;metros normales en pacientes con esteatosis.<sup>29</sup></font></p> </blockquote>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>DIAGN&Oacute;STICO</b></font></p>      <p align="justify"><font face="verdana" size="2">Entre 48&#45;100% de los pacientes con HGNA permanecen asintom&aacute;ticos, pero algunos pueden referir dolor leve en el cuadrante superior derecho, astenia y adinamia. La exploraci&oacute;n f&iacute;sica puede ser normal o encontrarse datos de hepatopat&iacute;a cr&oacute;nica o hipertensi&oacute;n portal, dependiendo del estadio al momento del diagn&oacute;stico <b>(<a href="/img/revistas/facmed/v54n3/a5f5.jpg" target="_blank">figura 5</a>).</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Frecuentemente, el paciente con HGNA es diagnosticado a partir del hallazgo incidental de anomal&iacute;as en estudios de laboratorio. Generalmente una elevaci&oacute;n de 2 a 4 veces el l&iacute;mite superior normal de los niveles de ALT y AST, con o sin una relaci&oacute;n AST/ALT menor a 1. La fosfatasa alcalina se encuentra ligeramente elevada en 30% de los pacientes, mientras que 25% presentan anticuerpos antinucleares positivos a t&iacute;tulos bajos (menores a 1:320), y entre 20 y 50% de los pacientes presentan niveles de ferritina elevados.<sup>10</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El primer paso en la evaluaci&oacute;n de un paciente en el que se sospecha HGNA es integrar una historia cl&iacute;nica completa, dirigida a encontrar ingesta de alcohol, factores de riesgo para VHC, factores asociados con en desarrollo de HGNA y exposici&oacute;n a agentes hepatot&oacute;xicos.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El ultrasonido, tiene una sensibilidad y especificidad para la detecci&oacute;n de esteatosis moderada a severa de 89 y 93%.<sup>30</sup> La sensibilidad de este m&eacute;todo disminuye conforme el IMC del paciente aumenta, y es &oacute;ptima cuando el porcentaje de esteatosis hep&aacute;tica es de por lo menos 30%.<sup>31</sup> La esteatosis aparece hiperec&oacute;ica en relaci&oacute;n al ri&ntilde;&oacute;n derecho o el bazo. El grado de esteatosis se basa en la evaluaci&oacute;n de la ecogenicidad: grado 0, ecogenicidad normal; grado 1, aumento ligero y difuso de la ecogenicidad del par&eacute;nquima hep&aacute;tico, con visualizaci&oacute;n del diafragma y los bordes de la vasculatura hep&aacute;tica; grado 3, aumento marcado de la ecogenicidad con pobre visualizaci&oacute;n de los bordes de los vasos intrahep&aacute;ticos. El ultrasonido no es &uacute;til para identificar la esteatohepatitis o el grado de fibrosis<sup>3</sup> <b>(<a href="/img/revistas/facmed/v54n3/a5f6.jpg" target="_blank">figura 6</a>).</b></font></p>     <p align="justify"><font face="verdana" size="2">La tomograf&iacute;a no contrastada puede detectar y cuantificar el grado de esteatosis; en ella, la escala de grises refleja el grado de radiaci&oacute;n absorbida, y se expresa en unidades Hounsfield (HU). La diferencia en HU medida entre el h&iacute;gado y el bazo correlaciona con el n&uacute;mero de hepatocitos con infiltraci&oacute;n grasa. Para una esteatosis de 33%, la sensibilidad es de 82&#45;93%, con una especificidad del 100%.</font></p>  	    <p align="justify"><font face="verdana" size="2">El mejor m&eacute;todo de imagen para detectar y cuantificar el grado de esteatosis es la resonancia magn&eacute;tica (RM) <b>(<a href="#f7">figura 7</a>).</b> Su sensibilidad y especificidad para el diagn&oacute;stico de esteatosis hep&aacute;tica es de 100 y 92.3%. Normalmente, en la fase T1 el h&iacute;gado se observa hiperintenso en relaci&oacute;n al bazo, pero un aumento en el contenido de grasa hace que la imagen del h&iacute;gado se vea menos intensa. Cuando el h&iacute;gado y el bazo presentan intensidades iguales, se habla de esteatosis leve, y cuando el h&iacute;gado es menos intenso que el bazo, de esteatosis moderada/severa. Es posible, adem&aacute;s, dar un valor cuantitativo al grado de esteatosis, promediando la esteatosis medida en cada una de las zonas hep&aacute;ticas afectadas, y detectar zonas de esteatosis seg&uacute;n la concentraci&oacute;n de triglic&eacute;ridos calculada por espectroscop&iacute;a.</font></p> 	    <p align="center"><a name="f7"></a></p> 	    <p align="center"><img src="/img/revistas/facmed/v54n3/a5f7.jpg"></p>     <p align="justify"><font face="verdana" size="2">La elastograf&iacute;a (FibroScan), m&eacute;todo no invasivo de detecci&oacute;n de fibrosis, se desarrolla en 3 fases:</font></p>  	    <blockquote> 	      <p align="justify"><font face="verdana" size="2">1. Se aplica un impulso mec&aacute;nico a la superficie cut&aacute;nea mediante un transductor.</font></p> 	      <p align="justify"><font face="verdana" size="2">2. Se propaga de una onda el&aacute;stica cuya velocidad de propagaci&oacute;n es inversamente proporcional al grado de fibrosis.</font></p> 	      <p align="justify"><font face="verdana" size="2">3. Se calcula el grado de fibrosis con base en la velocidad de propagaci&oacute;n de ondas registrada. La variaci&oacute;n interobservador es m&iacute;nima, y se ha reportado un coeficiente de correlaci&oacute;n intraclase de 0.984.<sup>32</sup></font></p> </blockquote>      ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El FibroScan tiene una correlaci&oacute;n estrecha con los hallazgos histol&oacute;gicos en pacientes con hepatopat&iacute;a cr&oacute;nica por HVC, HBV, coinfecci&oacute;n HIV&#45;HCV, hepatitis autoinmune, y HGNA,<sup>33,39</sup> y diferentes puntos de corte correlacionan con la existencia de v&aacute;rices esof&aacute;gicas grado 2/3, cirrosis Child&#45;Pugh B y ascitis,<sup>34</sup> pero su sensibilidad disminuye en con pacientes con IMC mayor a 28.<sup>35</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Existen 2 tipos de biomarcadores de fibrosis hep&aacute;tica:</font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>Tipo 1:</i></b> Reflejan la actividad fibrog&eacute;nica o fibrol&iacute;tica; se subclasifican en marcadores de:</font></p>  	    <p align="justify"><font face="verdana" size="2">&#45;Da&ntilde;o hepatocelular (ALT, AST, GGT,). </font></p>     <blockquote>           <p align="justify"><font face="verdana" size="2">&bull; Inflamaci&oacute;n (alfa2 microglobulina, haptoglobina, citocinas).</font></p>           <p align="justify"><font face="verdana" size="2">&bull; Fibrog&eacute;nesis (citocinas fibrog&eacute;nicas, factores estimuladores de colonias).</font></p>           <p align="justify"><font face="verdana" size="2">&bull; Recambio de matriz extracelular (hialuronano, fragmentos de col&aacute;gena, metaloproteasas, laminina).<sup>43</sup></font></p> </blockquote>      <p align="justify"><font face="verdana" size="2"><b><i>Tipo 2:</i></b> Algoritmos multiparam&eacute;tricos que eval&uacute;an el grado de dep&oacute;sito de tejido conectivo; La mayor&iacute;a fueron evaluados inicialmente en cirrosis por HCV/hepatopat&iacute;a alcoh&oacute;lica. En el caso espec&iacute;fico de HGNA/EHNA, al menos 2 biomarcadores tipo 2 han demostrado ser de utilidad:</font></p>  	    <blockquote> 	      ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&bull; El Fibrotest toma en cuenta edad, g&eacute;nero, bilirrubinas totales, GGT, apolipoprote&iacute;na A1 y haptoglobina, tiene una sensibilidad de 98%, valor predictivo negativo de 73% y valor predictivo positivo de 73%.36</font></p> 	      <p align="justify"><font face="verdana" size="2">&bull; El EHNA&#45;Test, toma en cuenta edad, g&eacute;nero, estatura, peso, triglic&eacute;ridos, colesterol, alfa 2 macroglobulina, apolipoprote&iacute;na A1, haptoglobina, GGT, ALT, AST y bilirrubina total; para el diagn&oacute;stico de EHNA llega a tener una sensibilidad de 88%, especificidad de 50%, VPP 74% y VPN 72%.<sup>37</sup></font></p> </blockquote>      <p align="justify"><font face="verdana" size="2">La <b><a href="/img/revistas/facmed/v54n3/a5t2.jpg" target="_blank">tabla 2</a></b> resume los principales biomarcadores.<sup>38,39</sup> La biopsia hep&aacute;tica, como procedimiento diagn&oacute;stico, tiene m&uacute;ltiples limitaciones, pero para cada una de ellas ha sido posible implementar estrategias de optimizaci&oacute;n, y es el &uacute;nico estudio que permite el diagn&oacute;stico de certeza y estadificaci&oacute;n de HGNA/EHNA, por lo que continua siendo el est&aacute;ndar de oro diagn&oacute;stico de esta patolog&iacute;a.<sup>40</sup></font></p>  	    <blockquote> 	      <p align="justify"><font face="verdana" size="2">1. Cada biopsia obtiene una porci&oacute;n equivalente a 1/50,000 del total del h&iacute;gado, as&iacute; que puede haber falla en el muestreo, con un 10&#45;30% de falsos negativos a cirrosis con una sola biopsia percut&aacute;nea a ciegas, pero si se toman 3 muestras, el porcentaje de diagn&oacute;sticos correctos es del 100%.<sup>41</sup></font></p> 	      <p align="justify"><font face="verdana" size="2">2. La valoraci&oacute;n histol&oacute;gica es operador dependiente, y se ha reportado un coeficiente de variaci&oacute;n interobservador de 45&#45;35% para el diagn&oacute;stico de EHNA, pero el muestreo adecuado y el uso de escalas estandarizadas bien definidas disminuyen la probabilidad de discordancia interobservador.</font></p> 	      <p align="justify"><font face="verdana" size="2">3. Conlleva una morbimortalidad potencial (complicaciones severas en 0.3% y mortalidad en 0.01% de los procedimientos) y, por tanto, es rechazada por algunos pacientes.<sup>46</sup></font></p> </blockquote>     <p align="justify"><font face="verdana" size="2">Los hallazgos histol&oacute;gicos de la EHNA incluyen: esteatosis macrovesicular, balonizaci&oacute;n hepatocitaria y necrosis, cuerpos hialinos de Mallory, megamitocondrias, n&uacute;cleos glucogenados, infiltrado inflamatorio, y fibrosis perivenular, pericelular portal y/o en puentes. Una vez establecido el diagn&oacute;stico histol&oacute;gico, se usa la clasificaci&oacute;n de Brunt, una escala semicuantitativa para la clasificaci&oacute;n de EHNA. Dicha clasificaci&oacute;n valora:<sup>42</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>1) El grado de esteatosis</i></b></font></p>  	    <blockquote> 	      ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&#151;&nbsp;0: No esteatosis.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;I: &lt; 33%.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;II: 33&#45;66%.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;III: &gt; 66%.</font></p> </blockquote>      <p align="justify"><font face="verdana" size="2"><b><i>2) Inflamaci&oacute;n hep&aacute;tica</i></b></font></p>  	    <blockquote> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;0 = Ausencia de inflamaci&oacute;n.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;1 = Inflamaci&oacute;n portal leve.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;2 = Inflamaci&oacute;n portal o intraacinar leve a moderada.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;3 = Inflamaci&oacute;n lobular y portal mayor al grado 2.</font></p> </blockquote>      ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>3) Fibrosis hep&aacute;tica</i></b></font></p>  	    <blockquote> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;0 = Ausencia de fibrosis.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;1 = Fibrosis perisinusoidal/pericelular leve.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;2 = Fibrosis perisinusoidal/pericelular con fibrosis periportal.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;3 = Fibrosis perisinusoidal/pericelular, fibrosis portal y puentes fibrosos.</font></p> 	      <p align="justify"><font face="verdana" size="2">&#151;&nbsp;4 = Cirrosis.</font></p> </blockquote>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>TRATAMIENTO</b></font></p>      <p align="justify"><font face="verdana" size="2">El abordaje terap&eacute;utico del HGNA debe de ser integral y multidisciplinario e incluye modificaciones en el estilo de vida, dieta, ejercicio, medicamentos y en algunos casos manejo quir&uacute;rgico de la obesidad (<a href="/img/revistas/facmed/v54n3/a5f8.jpg" target="_blank">figura 8</a>).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Tras descontinuar factores ex&oacute;genos contribuyentes al HGNA (medicamentos, exposici&oacute;n ambiental a metales pesados), la terap&eacute;utica debe encaminarse a la correcci&oacute;n del sobrepeso, resistencia a la insulina y dislipidemia, responsables del primer golpe en el desarrollo de HGNA.</font></p>     <p align="justify"><font face="verdana" size="2">Una disminuci&oacute;n del 5% del peso corporal, mantenida a largo plazo, mejora significativamente los niveles de ALT, y una reducci&oacute;n del 10% aminora, adem&aacute;s, los datos ultrasonogr&aacute;ficos de esteatosis y los estigmas cl&iacute;nicos de hepatopat&iacute;a en pacientes con HGNA.<sup>43</sup> Las modificaciones en el estilo de vida son el tratamiento de elecci&oacute;n para el sobrepeso, pero pueden ser necesarios f&aacute;rmacos adyuvantes e incluso manejo quir&uacute;rgico. Los planes diet&eacute;ticos pueden dividirse en aquellos basados en la modificaci&oacute;n en la composici&oacute;n de macronutrientes y los basados en disminuci&oacute;n del aporte energ&eacute;tico total.<sup>44</sup> Las dietas bajas en grasa (30%) son el r&eacute;gimen alimenticio recomendado por el National Cholesterol Education Program y la American Heart Association, la p&eacute;rdida de peso a una disminuci&oacute;n en la densidad cal&oacute;rica de los alimentos.</font></p>     <p align="justify"><font face="verdana" size="2">Las dietas bajas en carbohidratos (&lt; 100 g/d&iacute;a), conllevan un aumento en la ingesta de prote&iacute;nas y grasas que mantiene un grado alto de saciedad, pero inducen un estado de cetog&eacute;nesis y, se desconoce su seguridad a largo plazo. A una misma restricci&oacute;n cal&oacute;rica, una dieta baja en carbohidratos logra una mayor disminuci&oacute;n de peso,<sup>45,46</sup> y en pacientes con riesgo elevado de HGNA, una dieta baja en carbohidratos tiene mayor impacto en la disminuci&oacute;n de ALT, a una misma p&eacute;rdida de peso.<sup>47</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">La actividad f&iacute;sica disminuye el &iacute;ndice cintura/ cadera, la resistencia a la insulina, la esteatosis hep&aacute;tica, las concentraciones de IL&#45;6, IL&#45;5, TNF&#45;&#945;.<sup>48</sup> En conjunto, un plan diet&eacute;tico y ejercicio aer&oacute;bico logran mejor&iacute;as mucho mayores que las logradas con cada uno de ellos por separado.<sup>49</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El orlistat, reduce la infiltraci&oacute;n grasa del h&iacute;gado, el grado de fibrosis, el nivel de transaminasa, colesterol total, triglic&eacute;ridos, LDL, &iacute;ndice HOMA, y hemoglobina glucosilada en pacientes con HGNA/ EHNA, sometidos a dieta hipocal&oacute;rica.<sup>50</sup>,<sup>51</sup> La sibutramina disminuye los niveles de transaminasas y los datos ultrasonogr&aacute;ficos de EHNA en pacientes obesos con EHNA.<sup>52</sup></font></p>     <p align="center"><font face="verdana" size="2"></font><img src="/img/revistas/facmed/v54n3/a5l1.jpg"></p>     <p align="justify"><font face="verdana" size="2">Tanto la sibutramina como el orlistat disminuyen las manifestaciones ultrasonogr&aacute;ficas de esteatohepatitis y los niveles de transaminasas cuando se administran en conjunto con una dieta hipocal&oacute;rica en sujetos obesos con EHNA, pero tambi&eacute;n se observ&oacute; elevaci&oacute;n de la fosfatasa alcalina con ambos f&aacute;rmacos.<sup>53</sup></font></p>     <p align="justify"><font face="verdana" size="2">Para pacientes con obesidad severa (IMC mayor a 35) la cirug&iacute;a bari&aacute;trica representa una opci&oacute;n terap&eacute;utica; adem&aacute;s de ser efectiva en la reducci&oacute;n del peso corporal, disminuye diversos marcadores relacionados con HGNA/EHNA, la hipertensi&oacute;n arterial, los niveles de aminotransferasas y diversos biomarcadores tipo 2 de EHNA, a los 12&#45;30 meses tras la cirug&iacute;a, siguiendo la p&eacute;rdida de peso;<sup>54</sup> Se ha reportado incluso la normalizaci&oacute;n de la glicemia capilar en el 100% de pacientes con obesidad m&oacute;rbida y EHNA tras 2 a&ntilde;os de haber sido sometidos a cirug&iacute;a bari&aacute;trica.<sup>55</sup> Los posibles efectos colaterales, incluyen problemas de malabsorci&oacute;n, malnutrici&oacute;n, deficiencia de micronutrientes.<sup>56</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Otros medicamentos que han demostrado un efecto ben&eacute;fico en pacientes con HGNA/EHNA incluyen:<sup>57</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>Metformina.</i></b> En modelos animales ha demostrado disminuir la esteatosis y las anomal&iacute;as en las aminotransferasas. En estudios en humanos, ha demostrado que disminuye los niveles de ALT, insulina, p&eacute;ptido C y actividad necroinflamatoria, el nivel de esteatosis y la hepatomegalia. <b><i>Tiazolidinedionas, y agonistas PPAR&#45;&#947;.</i></b> Aumentan la expresi&oacute;n de adiponectina y disminuyen tanto la expresi&oacute;n de TNF&#945; como la s&iacute;ntesis de col&aacute;gena. La pioglitazona, en conjunto con vitamina E, disminuye la esteatosis y necroinflamaci&oacute;n, y como monoterapia, ha comprobado mejorar tanto los marcadores s&eacute;ricos como histol&oacute;gicos de EHNA tras 48 semanas de tratamiento. El tratamiento con rosiglitazona durante 48 semanas mejora significativamente los niveles de ALT, AST, GGT y la sensibilidad a la insulina.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>Estatinas.</i></b> Las estatinas son inhibidores competitivos de la hidroximetil coenzima A (HMGCoA) reductasa, han demostrado ser hepatoprotectoras y &uacute;tiles en la reducci&oacute;n del contenido de grasa hep&aacute;tica en pacientes con EHNA e hiperlipidemia. La atorvastatina, pravastatina y rosuvastatina han demostrado ser seguras y efectivas en la disminuci&oacute;n de aminotransferasas en pacientes con EHNA despu&eacute;s de 6&#45;8 meses de tratamiento. Sin embargo, los estudios reportados incluyen s&oacute;lo un n&uacute;mero peque&ntilde;o de pacientes, y no todos inclu&iacute;an valoraci&oacute;n histol&oacute;gica de los resultados. <b><i>Fibratos.</i></b> Podr&iacute;an ser de utilidad en el tratamiento de EHNA. El fenofibrato, por ser un agonista PPAR&#45;&#945;, podr&iacute;a ser ben&eacute;fico para los pacientes con EHNA mediante mecanismos similares a los de las estatinas. El gemfibrozil, a dosis de 600 mg/d&iacute;a durante un mes, normaliza los niveles de ALT en pacientes con EHNA, pero se desconoce su impacto en los marcadores histol&oacute;gicos de EHNA. El Clofibrato ha demostrado ser &uacute;til en la disminuci&oacute;n de la fosfatasa alcalina, pero su efecto en la disminuci&oacute;n en la ALT, GGT y grado histol&oacute;gico de fibrosis es menor al observado con &aacute;cido ursodesoxic&oacute;lico. </font></p>     <p align="justify"><font face="verdana" size="2"><b><i>&Aacute;cido ursodesoxic&oacute;lico (ursodiol).</i></b> Es un agente antiapopt&oacute;tico, citoprotector, inmunomodulador empleado en m&uacute;ltiples hepatopat&iacute;as. En EHNA, se ha demostrado su utilidad en la disminuci&oacute;n de los niveles de ALT y GGT, pero no en los niveles de esteatosis, necroinflamaci&oacute;n o fibrosis.<sup>58</sup> </font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Vitamina E.</i></b> Es un antioxidante. A pesar de que el estr&eacute;s oxidativo es parte fundamental de la fisiopatolog&iacute;a de la lesi&oacute;n hep&aacute;tica en la EHNA, no se ha demostrado la utilidad de la vitamina E como monoterapia, ni en combinaci&oacute;n vitamina C, para mejorar los par&aacute;metros histol&oacute;gicos en pacientes con EHNA, e incluso se ha documentado un aumento de la mortalidad cuando se administra en dosis altas.<sup>59</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Probi&oacute;ticos.</i></b> En modelos animales, el uso de probi&oacute;ticos disminuye el da&ntilde;o hep&aacute;tico por EHNA, pero en humanos no se ha comprobado su eficacia en la disminuci&oacute;n de transaminasas, si bien no se ha evaluado su eficacia para la disminuci&oacute;n de marcadores histol&oacute;gicos de HGNA.<sup>69,70</sup> </font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Pentoxifilina.</i></b> Metilxantina que inhibe el TNF&#945;; ha demostrado que, en pacientes con EHNA, disminuye la concentraci&oacute;n de transaminasas, los niveles de TNF&#945;, IL&#45;6, IL&#45;8 y &aacute;cido hialur&oacute;nico. La beta&iacute;na, componente del ciclo metab&oacute;lico de la tionina , aumenta los niveles de S&#45;adenosilmetionina, evitando la infiltraci&oacute;n grasa en modelos animales<sup>67</sup>. </font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Losart&aacute;n.</i></b> un antagonista de los receptores de angiotensina, disminuye los niveles s&eacute;ricos de aminotransferasas, marcadores de fibrosis y TGF&#45;1, la necroinflamaci&oacute;n, fibrosis y hierro hep&aacute;ticos<sup>71</sup>.</font></p>      <p align="justify"><font face="verdana" size="2">El trasplante hep&aacute;tico puede ser necesario en pacientes con cirrosis complicada con falla hep&aacute;tica o hepatocarcinoma; 3% de los trasplantes hep&aacute;ticos en Estados Unidos corresponden a pacientes con HGNA en etapa terminal. La sobrevida postrasplante a 1 y 3 a&ntilde;os es de 93.7 y 81.2%, respectivamente. En 60&#45;100% de los receptores de trasplante, hay recurrencia de la esteatosis, con progresi&oacute;n a esteatohepatitis en un tercio de los casos.<sup>72</sup></font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>      <p align="justify"><font face="verdana" size="2">El sedentarismo, los cambios en los h&aacute;bitos alimentarios y el sobrepeso inducen una grave alteraci&oacute;n metab&oacute;lica caracterizada por hiperglicemia, hiperinsulinemia, resistencia a la insulina e hipertrigliceridemia que condicionan la aparici&oacute;n de esteatosis hep&aacute;tica. El ambiente proinflamatorio secundario al aumento en la peroxidaci&oacute;n lip&iacute;dica, la disfunci&oacute;n mitocondrial y las citocina liberadas por adipocitos y c&eacute;lulas de Kupffer, son los factores que condicionan el desarrollo de esteatohepatitis y cirrosis en pacientes con h&iacute;gado graso. Existen medidas eficaces para prevenir la aparici&oacute;n y progresi&oacute;n del HGNA, la m&aacute;s importante es el cambio en el estilo de vida. Los sensibilizadores de insulina, hipolipemiantes y algunos antifibr&oacute;ticos han probado tambi&eacute;n ser de utilidad en el tratamiento del HGNA.</font></p>  	    ]]></body>
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