<?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>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762004000200010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Anormalidades metabólicas en pacientes con infección por VIH]]></article-title>
<article-title xml:lang="en"><![CDATA[Metabolic abnormalities in patients with HIV infection]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Carranza]]></surname>
<given-names><![CDATA[Sandra I.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar Salinas]]></surname>
<given-names><![CDATA[Carlos A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Departamento de Endocrinología y Metabolismo ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2004</year>
</pub-date>
<volume>56</volume>
<numero>2</numero>
<fpage>193</fpage>
<lpage>208</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762004000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762004000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762004000200010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La terapia antirretroviral altamente activa (TARAA) en pacientes con infección por virus de inmunodeficiencia humana (VIH) disminuyó la morbimortalidad del padecimiento, sin embargo, sus efectos sobre el metabolismo de lipoproteínas, carbohidratos y tejido adiposo son causa frecuente de consulta y en el futuro de morbimortalidad. Nuestro objetivo es describir el estado actual del conocimiento sobre la epidemiología, fisiopatología, diagnóstico y tratamiento de estas complicaciones. Se incluye un análisis crítico de las evidencias existentes. La dislipidemia es multifactorial. Antes del inicio del tratamiento es común encontrar hipertrigliceridemia con concentraciones bajas de colesterol y colesterol HDL. Los medicamentos antirretrovirales, en especial algunos inhibidores de proteasas, tienen efectos adversos sobre el metabolismo de lipoproteínas. A ello se suma la recuperación nutricional y se agrava en presencia de lipodistrofia. El efecto final es hipertrigliceridemia (moderada a severa, en especial con ritonavir) con hipercolesterolemia moderada (< 300 mg/dL). La grasa subcutánea en cara y extremidades inferiores disminuye y se deposita en sitios anormales (cuello, grasa intraabdominal). La evaluación y el tratamiento de estas complicaciones es controversial debido a la falta de evidencias. Las alteraciones metabólicas asociadas a TARAA serán una de las principales causas de morbimortalidad en los próximos años. Por ello, se requieren estudios longitudinales en distintos grupos étnicos que evalúen los determinantes de estas complicaciones y mejores estrategias de prevención y tratamiento. La interacción entre endocrinólogos, infectólogos y otros especialistas será cada vez más frecuente e indispensable en este campo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Highly active antiretroviral therapy (HAART) decreased the mortality of patients with HIV infection, but its effects on the metabolism of lipoproteins, carbohydrates and adipose tissue are a common cause for seeking treatment. Our purpose is to present the current knowledge available regarding the epidemiology, pathophysiology, diagnosis and treatment of these conditions. A discussion about the limitations of the current evidence is included. HIV-related dyslipidemia is multifactorial. Prior to the treatment, hypertriglyceridemia is found frequently,usually with low cholesterol and HDL cholesterol levels. Antiretroviral agents, especially some protease inhibitors, have adverse effects on plasma lipids. Nutritional recovery and lipodistrophy exacerbate the lipid abnormalities. Hypertriglyceridemia (usually moderate to severe) and moderate hypercholesterolemia (< 300 mg/dL) are the most common end-results. Subcutaneous fat of the face and limbs decreases and it is deposited in the neck and in the abdomen. The diagnosis and treatment of these conditions are controversial due to the lack of appropiate evidence. The metabolic complications of HAART could be a leading cause of mortality in the near future. Thus, longitudinal studies, including subjects from several ethnic groups are needed to identify the main factors involved in the pathophysiology and to assess several therapeutical and preventive strategies. Collaboration between HIV specialists and other health professionals (i.e. endocrinologysts) will be required to accomplish these goals.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Virus de inmunodeficiencia humana]]></kwd>
<kwd lng="es"><![CDATA[Dislipidemias]]></kwd>
<kwd lng="es"><![CDATA[Antirretrovirales]]></kwd>
<kwd lng="es"><![CDATA[Inhibidores de proteasas]]></kwd>
<kwd lng="es"><![CDATA[Lipodistrofia]]></kwd>
<kwd lng="en"><![CDATA[Human immunodeficiency virus]]></kwd>
<kwd lng="en"><![CDATA[Dyslipidemias]]></kwd>
<kwd lng="en"><![CDATA[Antiretrovirals]]></kwd>
<kwd lng="en"><![CDATA[Protease inhibitors]]></kwd>
<kwd lng="en"><![CDATA[Lipodistrophy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><font size="2" face="Verdana">Rev Invest Cl&iacute;n 2004; Vol. 56(2):193-208    <br>     <b>ART&Iacute;CULO ESPECIAL</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana"><b>Anormalidades metab&oacute;licas en pacientes con infecci&oacute;n por VIH</b></font></p>     <p><b><i>Metabolic abnormalities in patients with HIV infection</i></b></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Sandra I. Rodr&iacute;guez Carranza<font size="2" face="Verdana"><b><sup>*</sup></b></font>    <br> Carlos A. Aguilar Salinas<font size="2" face="Verdana"><b><sup>*</sup></b></font></b></font></p>     <p><font size="2" face="Verdana">*Departamento de Endocrinolog&iacute;a y Metabolismo. Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Reimpresos:    <br>         <br>     Dra. Sandra I. Rodr&iacute;guez Carranza    <br>   Departamento de Endocrinolog&iacute;a y Metabolismo. Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n.    <br> Vasco de Quiroga 15, Tlalpan. 14000, M&eacute;xico, D.F.     <br> Tel.: 5513-3891 Fax: 5513-0002</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Recibido: 25 de marzo de 2003.    <br> Aceptado: 3 de noviembre de 2003. </font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana">La terapia antirretroviral altamente activa (TARAA) en pacientes con infecci&oacute;n por virus de inmunodeficiencia humana (VIH) disminuy&oacute; la morbimortalidad del padecimiento, sin embargo, sus efectos sobre el metabolismo de lipoprote&iacute;nas, carbohidratos y tejido adiposo son causa frecuente de consulta y en el futuro de morbimortalidad. Nuestro objetivo es describir el estado actual del conocimiento sobre la epidemiolog&iacute;a, fisiopatolog&iacute;a, diagn&oacute;stico y tratamiento de estas complicaciones. Se incluye un an&aacute;lisis cr&iacute;tico de las evidencias existentes. La dislipidemia es multifactorial. Antes del inicio del tratamiento es com&uacute;n encontrar hipertrigliceridemia con concentraciones bajas de colesterol y colesterol HDL. Los medicamentos antirretrovirales, en especial algunos inhibidores de proteasas, tienen efectos adversos sobre el metabolismo de lipoprote&iacute;nas. A ello se suma la recuperaci&oacute;n nutricional y se agrava en presencia de lipodistrofia. El efecto final es hipertrigliceridemia (moderada a severa, en especial con ritonavir) con hipercolesterolemia moderada (&lt; 300 mg/dL). La grasa subcut&aacute;nea en cara y extremidades inferiores disminuye y se deposita en sitios anormales (cuello, grasa intraabdominal). La evaluaci&oacute;n y el tratamiento de estas complicaciones es controversial debido a la falta de evidencias. Las alteraciones metab&oacute;licas asociadas a TARAA ser&aacute;n una de las principales causas de morbimortalidad en los pr&oacute;ximos a&ntilde;os. Por ello, se requieren estudios longitudinales en distintos grupos &eacute;tnicos que eval&uacute;en los determinantes de estas complicaciones y mejores estrategias de prevenci&oacute;n y tratamiento. La interacci&oacute;n entre endocrin&oacute;logos, infect&oacute;logos y otros especialistas ser&aacute; cada vez m&aacute;s frecuente e indispensable en este campo. </font></p>     <p><font size="2" face="Verdana"><b>PALABRAS CLAVE.</b> Virus de inmunodeficiencia humana. Dislipidemias. Antirretrovirales. Inhibidores de proteasas. Lipodistrofia.</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b><i>ABSTRACT</i></b><i></b></i></font></p>     <p><i><font size="2" face="Verdana">Highly active antiretroviral therapy (HAART) decreased the mortality of patients with HIV infection, but its effects on the metabolism of lipoproteins, carbohydrates and adipose tissue are a common cause for seeking treatment. Our purpose is to present the current knowledge available regarding the epidemiology, pathophysiology, diagnosis and treatment of these conditions. A discussion about the limitations of the current evidence is included. HIV-related dyslipidemia is multifactorial. Prior to the treatment, hypertriglyceridemia is found frequently,usually with low cholesterol and HDL cholesterol levels. Antiretroviral agents, especially some protease inhibitors, have adverse effects on plasma lipids. Nutritional recovery and lipodistrophy exacerbate the lipid abnormalities. Hypertriglyceridemia (usually moderate to severe) and moderate hypercholesterolemia (&lt; 300 mg/dL) are the most common end-results. Subcutaneous fat of the face and limbs decreases and it is deposited in the neck and in the abdomen. The diagnosis and treatment of these conditions are controversial due to the lack of appropiate evidence. The metabolic complications of HAART could be a leading cause of mortality in the near future. Thus, longitudinal studies, including subjects from several ethnic groups are needed to identify the main factors involved in the pathophysiology and to assess several therapeutical and preventive strategies. Collaboration between HIV specialists and other health professionals (i.e. endocrinologysts) will be required to accomplish these goals.</font></i></p>     <p><i><font size="2" face="Verdana"><b>KEY WORDS.</b>  Human immunodeficiency virus. Dyslipidemias. Antiretrovirals. Protease inhibitors. Lipodistrophy.</font></i></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>INTRODUCCI&Oacute;N </b></font></p>     <p><font size="2" face="Verdana">La terapia antirretroviral altamente activa (TARAA) en pacientes con infecci&oacute;n por virus de inmunodeficiencia humana (VIH) disminuy&oacute; la morbimortalidad del padecimiento. Durante el periodo de 1995 a 1997, la mortalidad relacionada a VIH en los Estados Unidos disminuy&oacute; de 29.4 a 8.8 por 100 personas por a&ntilde;o. <SUP>1</SUP> Las reducciones mayores coincidieron con la introducci&oacute;n de los inhibidores de proteasas (IP). Los diferentes reg&iacute;menes de TARAA incluyen la combinaci&oacute;n de medicamentos de tres diferentes categor&iacute;as: inhibidores de transcriptasa reversa de tipo nucle&oacute;sido (ITRN), inhibidores de transcriptasa reversa de tipo no nucle&oacute;sido (ITRNN) e inhibidores de proteasas (IP). Los ITRNN y los ITRN inhiben a la transcriptasa reversa y suprimen la replicaci&oacute;n del genoma viral. Los IP inhiben la maduraci&oacute;n del virus, limitando la infectividad de las part&iacute;culas virales. Los reg&iacute;menes m&aacute;s frecuentes incluyen dos ITRN (abacavir, didanosida, lamivudina, estavudina, zalcitabina, zidovudina) en combinaci&oacute;n con uno o dos IP (amprenavir, indinavir, lopinavir, nelfinavir, ritonavir, saquinavir) y/o un ITRNN (efavirenz, nevirapina). Sin embargo, los antirretrovirales producen efectos adversos metab&oacute;licos similares a lo observado en el s&iacute;ndrome metab&oacute;lico. Las anormalidades incluyen dislipidemia, lipodistrofia o lipoatrofia, intolerancia a la glucosa o diabetes, acidosis l&aacute;ctica, hiperfibrinogenemia, concentraciones altas de prote&iacute;na C-reactiva, apolipoprote&iacute;na B, inhibidor del activador de plasmin&oacute;geno tipo 1, disminuci&oacute;n en la vasodilataci&oacute;n arterial mediada por flujo y aumento en el grosor de la &iacute;ntima de la arteria car&oacute;tida. La consecuencia esperable es aceleraci&oacute;n de la ateroesclerosis. <SUP>2-5</SUP> El objetivo de esta revisi&oacute;n es describir la fisiopatolog&iacute;a, diagn&oacute;stico y tratamiento de las alteraciones metab&oacute;licas de los pacientes con VIH.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>COMPLICACIONES CARDIOVASCULARES </b></font></p>     <p><font size="2" face="Verdana">Antes de la introducci&oacute;n de TARAA, la enfermedad coronaria se asociaba al propio VIH, o bien a citomegalovirus. En a&ntilde;os recientes, existen m&uacute;ltiples reportes de eventos coronarios agudos en pacientes que reciben tratamiento con IP. Pese a ello, a&uacute;n no es posible cuantificar con certeza el riesgo cardiovascular del paciente con VIH, ya que no existen estudios prospectivos con el poder suficiente para ello. La evidencia actual proviene de estudios retrospectivos o de cohortes peque&ntilde;as. Por ejemplo, el estudio retrospectivo de Frankfurt encontr&oacute; un aumento de cuatro veces en la incidencia de infarto agudo al miocardio despu&eacute;s de la introducci&oacute;n de reg&iacute;menes de TARAA comparado con la etapa previa a ese tipo de tratamiento. <SUP>6</SUP> El uso de IPs asoci&oacute; en forma independiente a la incidencia del infarto agudo al miocardio. Dos estudios transversales aportan conclusiones similares. <SUP>5,7</SUP> En uno de ellos hubo aumento del n&uacute;mero de eventos vasculares en relaci&oacute;n con la duraci&oacute;n con el tratamiento con IPs. <SUP>7</SUP> Klein inform&oacute; al estudiar 4,541 pacientes de 1996 al 2000, que la tasa de eventos cardiovasculares fue mayor en los pacientes con VIH comparada contra la de los controles (2.8 eventos por 1,000 personas por a&ntilde;o), <SUP>4</SUP> pero la diferencia no fue explicada por el empleo de los IP (5.8 <i>   vs </I> . 5.2 eventos por 1,000 personas por a&ntilde;o entre los que usaron o no IP). Otro estudio retrospectivo <SUP>8</SUP> mostr&oacute; que en 36,766 casos tratados de 1995 a 2001, la mortalidad global disminuy&oacute; 75%, mientras que la tasa de admisi&oacute;n hospitalaria o muerte por enfermedad cardiovascular o cerebrovascular permaneci&oacute; constante. En este informe no se encontr&oacute; asociaci&oacute;n entre el tipo de antirretroviral y la incidencia de eventos vasculares. Finalmente, estudios que eval&uacute;an ateroesclerosis subcl&iacute;nica no han sido concluyentes, pese a que diversos m&eacute;todos han sido empleados (espesor de la &iacute;ntima media de arterias car&oacute;tidas, funci&oacute;n endotelial (reactividad braquial), tomograf&iacute;a computarizada con electrones, etc.). <SUP>9</SUP> Evidencias prospectivas son escasas. El estudio HOPS (HIV Outpatient Study), reporte prospectivo observacional de 5,672 pacientes seguidos desde 1992, <SUP>10</SUP> mostr&oacute; que la incidencia de infarto del miocardio aument&oacute; con el uso de IP (raz&oacute;n de momios 7.1, IC 95%1.6-44.3). De los casos tratados con IP (n = 3,247), 19 tuvieron un evento vascular; en contraste s&oacute;lo dos de los 2,425 sujetos que no emplearon IP tuvieron esta complicaci&oacute;n. La independencia de la asociaci&oacute;n persisti&oacute; al ajustar por la presencia de confusores, sin embargo, el n&uacute;mero de eventos vasculares es peque&ntilde;o para establecer conclusiones. En resumen, los IP probablemente aumentan el riesgo de sufrir eventos vasculares. Las complicaciones vasculares aumentar&aacute;n su frecuencia en el futuro, ya que la poblaci&oacute;n envejecer&aacute; aumentando la posibilidad de interactuar con otros factores asociados con la ateroesclerosis. <SUP>11-15</SUP> Una complicaci&oacute;n adicional resultante del da&ntilde;o vascular ser&aacute; un aumento en la incidencia de insuficiencia cardiaca. <SUP>6</SUP></font></p>     <p><font size="2" face="Verdana">Datos en modelos experimentales apoyan la aterogenicidad de los IP. Dressman    <SUP>16</SUP> demostr&oacute; que 3 IPs aceleran la formaci&oacute;n de c&eacute;lulas espumosas; este efecto se observ&oacute; aun en ausencia de hiperlipidemia. Demostr&oacute; que el ac&uacute;mulo de l&iacute;pidos en los macr&oacute;fagos se explica por aumento en la actividad del receptor CD36; su ausencia (en un modelo transg&eacute;nico) evit&oacute; la aparici&oacute;n de las lesiones causadas por los IPs. Estos datos pueden ser &uacute;tiles para identificar posibles marcadores de riesgo cardiovascular en pacientes tratados con IP (ej. actividad CD36 en polimorfonucleares).</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>HIPERLIPIDEMIA</b> </font></p>     <p><font size="2" face="Verdana">Puede ser explicada por varios mecanismos: efectos de la infecci&oacute;n viral, recuperaci&oacute;n nutricional, acciones adversas de los antirretrovirales y cambios inducidos por la aparici&oacute;n de la lipodistrofia. Cada componente se describir&aacute; a continuaci&oacute;n: </font></p>     <p><font size="2" face="Verdana"><B><i>1. Infecci&oacute;n por VIH. </I> </B> La infecci&oacute;n por VIH asintom&aacute;tica se asocia con una disminuci&oacute;n temprana en las concentraciones plasm&aacute;ticas de colesterol de alta densidad (HDL). <SUP>17</SUP> La progresi&oacute;n hacia enfermedad sintom&aacute;tica y a s&iacute;ndrome de inmunodeficiencia adquirida (SIDA) causa mayor disminuci&oacute;n del colesterol HDL, disminuci&oacute;n del colesterol total, elevaci&oacute;n de triglic&eacute;ridos y acumulaci&oacute;n de las subclases peque&ntilde;as y densas de las LDL. Los niveles de colesterol HDL son menores en pacientes con cuentas bajas de linfocitos CD4. <SUP>18</SUP> Las anormalidades son una respuesta inespec&iacute;fica a una infecci&oacute;n con repercusi&oacute;n sist&eacute;mica; existe relaci&oacute;n entre las concentraciones plasm&aacute;ticas de triglic&eacute;ridos con las concentraciones de &beta;2-microglobulina y de factor de necrosis tumoral-&alpha;, o de interfer&oacute;n-&gamma;. <SUP>17,19</SUP> La hipertrigliceridemia se debe a disminuci&oacute;n de la actividad de la lipasa liproteica, debido al ac&uacute;mulo sangu&iacute;neo de sus inhibidores (ej. &aacute;cidos grasos). La producci&oacute;n hep&aacute;tica de lipoprote&iacute;nas es anormalmente baja, hecho que limita la severidad de la hipertrigliceridemia. </font></p>     <p><font size="2" face="Verdana"><B><i>2. Recuperaci&oacute;n nutricional </I>    </B> El inicio del TARAA causa recuperaci&oacute;n del peso y del estado de nutrici&oacute;n. Como resultado, la producci&oacute;n hep&aacute;tica de lipoprote&iacute;nas aumenta. Por ello, las concentraciones de los l&iacute;pidos sangu&iacute;neos regresan a las concentraciones previas a la infecci&oacute;n. En muchos estudios que analizaron el efecto del TARAA no han disecado este confusor; por ello, se sobreestima la magnitud de los efectos adversos del tratamiento. Los datos de Riddler, et al. son un claro ejemplo de ello. <SUP>20</SUP> Los autores contaban con valores antes de la infecci&oacute;n, antes y despu&eacute;s del tratamiento en 50 pacientes. La diferencia final por tratamiento fue de 18 mg/dL en el colesterol, de 5 mg/dL en el colesterol LDL y un d&eacute;ficit de 10 mg/dL en el colesterol HDL. Si no se hubiese tenido la informaci&oacute;n pre-infecci&oacute;n, se hubiera concluido err&oacute;neamente que el tratamiento increment&oacute; 50 mg/d la concentraci&oacute;n de colesterol. </font></p>     <p><font size="2" face="Verdana"><B><i>3. Efectos de los antirretrovirales. </I> </B> Estudios en voluntarios sanos demuestran que los antirretrovirales son causa de dislipidemia: este efecto se observa pocos d&iacute;as despu&eacute;s del inicio del tratamiento. En el <a href="/img/revistas/ric/v56n2/n2a10c1.jpg" target="_blank">cuadro 1</a> se resumen las alteraciones m&aacute;s frecuentes. Su prevalencia var&iacute;a de acuerdo con la fuente consultada; son m&uacute;ltiples los factores que determinan su frecuencia. Entre ellos est&aacute;n el tiempo de administraci&oacute;n, la presencia de lipodistrofia, los valores de corte usados y alteraciones preexistentes en el perfil de l&iacute;pidos. Uno de los reportes m&aacute;s representativos es el estudio DAD (Data collection of adverse events of antiHIV drugs) que incluye m&aacute;s de 20,000 casos de Europa, Estados Unidos y Australia.21 En el <a href="/img/revistas/ric/v56n2/n2a10c2.jpg" target="_blank">cuadro 2</a> se muestra la prevalencia de las diversas dislipidemias de acuerdo con el tipo de tratamiento recibido. La prevalencia de hipercolesterolemia es tres veces mayor en los casos tratados, en especial cuando se incluye un IP. Sin embargo, las concentraciones de los casos que suspendieron el tratamiento eran similares al de los que no lo hab&iacute;an recibido; este dato sugiere que el efecto es reversible. Niveles bajos de colesterol HDL se presentan en casi 25% de los casos; la prevalencia es menor en los tratados con inhibidores no nucle&oacute;sidos (19%). La prevalencia de hipertrigliceridemia es similar en tratados y no tratados, excepto si un IP es utilizado. Niveles muy altos de triglic&eacute;ridos (&gt;1,000 mg/dL) est&aacute;n asociados al uso de IP, especialmente con el ritonavir <SUP>.2,22-33</SUP> Hipertrigliceridemias extremas pueden ser causa de pancreatitis aguda, dolor abdominal con enzimas pancre&aacute;ticas normales, disnea, p&eacute;rdida de memoria, lipemia retinalis y xantomas eruptivos. <SUP>17</SUP> El uso de IP aumenta los niveles de triglic&eacute;ridos en promedio 113%. El colesterol es mayor en pacientes tratados con efavirenz.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Los efectos de los IP var&iacute;an entre ellos. El ritonavir es el que tiene un efecto mayor; en el extremo opuesto est&aacute; el indinavir. Un inhibidor de proteasas en desarrollo, el atazanavir, tiene un efecto neutro en el perfil de l&iacute;pidos. A&uacute;n m&aacute;s, al combinarse con el ritonavir disminuye la incidencia de dislipidemia causada por el ritonavir. Este efecto ben&eacute;fico no ha sido observado con otros antirretrovirales. <SUP>34-37</SUP></font></p>     <p align="left"><font size="2" face="Verdana">La asociaci&oacute;n entre los ITRN y la dislipidemia es menos clara. En estudios con dise&ntilde;o cruzado se ha asociado la estavudina a valores mayores de colesterol y triglic&eacute;ridos. <SUP>37,38</SUP>   Sin embargo, en otros estudios longitudinales y controlados, en ausencia de lipodistrofia, los ITRN no son causa frecuente de hipertrigliceridemia.  <SUP>30,34,38-40</SUP></font></p>     <p align="left"><font size="2" face="Verdana">En ausencia de lipodistrofia, ninguno de los ITRNN parecen implicados en el desarrollo de dislipidemia. Por ello, es frecuente que se sustituyan IPs por ITRNNs para el manejo de la dislipidemia.      <SUP>28</SUP> En muchos casos, esta estrategia disminuye el nivel de triglic&eacute;ridos; su efecto sobre el nivel de colesterol es variable <SUP>41-43</SUP> y en ocasiones se observa un colesterol HDL mayor.  <SUP>43</SUP> Tambi&eacute;n puede disminuir la lipodistrofia despu&eacute;s de cambiar un IP por nevirapina. <SUP>44</SUP></font></p>     <p align="left"><font size="2" face="Verdana">Los factores identificados como predictores de dislipidemia var&iacute;an notablemente entre los estudios. Los m&aacute;s comunes son carga viral baja, CD4 altos, sujetos con recuperaci&oacute;n nutricional, preexistencia de dislipidemia, diabetes y la lipodistrofia. <SUP>30,34,44-48</SUP> Se ha encontrado hipertrigliceridemia en pacientes tratados con IP en ausencia de resistencia a insulina. La dislipidemia no es espec&iacute;fica de pacientes con VIH, ya que tambi&eacute;n se observa en voluntarios sanos que reciben IPs. <SUP>49</SUP></font></p>     <p align="left"><font size="2" face="Verdana">La fisiopatolog&iacute;a de la dislipidemia se muestra en la <a href="/img/revistas/ric/v56n2/n2a10f1.jpg" target="_blank">figura 1</a>; los mecanismos son:</font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B><i>&bull; Sobreproducci&oacute;n de part&iacute;culas VLDL por el h&iacute;gado. </I>   </B>        Los IP estimulan <i>   in vitro </I> la producci&oacute;n hep&aacute;tica de lipoprote&iacute;nas. Estudios de cin&eacute;tica de lipoprote&iacute;nas en humanos demuestran que los IPs aumentan 76% la tasa de producci&oacute;n hep&aacute;tica de lipoprote&iacute;nas. <SUP>50</SUP> Este defecto puede ser debido a una menor degradaci&oacute;n de apolipoprote&iacute;na B-100, prote&iacute;na principal de las lipoprote&iacute;nas ricas en triglic&eacute;ridos (ej. VLDL). Los IPs inhiben la degradaci&oacute;n proteasomal de la apolipoprote&iacute;na B naciente. <SUP>51</SUP> Adem&aacute;s los IPs activan diversos genes lipog&eacute;nicos en el h&iacute;gado regulados por la prote&iacute;na de uni&oacute;n a los elementos regula-dores del esterol (SREBP). Por otro lado, la mejor&iacute;a en el estado nutricional y la hiperinsulinemia contribuyen a la activaci&oacute;n de esta v&iacute;a metab&oacute;lica. Es, el mecanismo m&aacute;s importante en estudio <i>   in vivo </I> . Por el contrario, la producci&oacute;n hep&aacute;tica est&aacute; disminuida en pacientes con s&iacute;ndrome de desgaste o antes del tratamiento con antirretrovirales. </font></p>     <p align="left"><font size="2" face="Verdana"><B><i>&bull; Retraso en la eliminaci&oacute;n de lipoprote&iacute;nas ricas en triglic&eacute;ridos </I>    </B> Los IP inhiben la actividad de la lipasa lipoproteica y de la lipasa hep&aacute;tica; ambas son responsables de la eliminaci&oacute;n de las lipoprote&iacute;nas ricas en triglic&eacute;ridos. El mecanismo molecular de esta acci&oacute;n se desconoce. La resistencia a la insulina, el aumento de la concentraci&oacute;n de &aacute;cidos grasos circulantes (propio de la lipodistrofia) son posibles mecanismos. Es probable que este defecto tenga un papel secundario en la fisiopatolog&iacute;a de la dislipidemia. Algunos autores han propuesto que los IPs inhiben de manera inespec&iacute;fica a la prote&iacute;na relacionada con el receptor de LDL (LRP), encargada de la eliminaci&oacute;n de las lipoprote&iacute;nas ricas en triglic&eacute;ridos parcialmente catabolizadas (llamadas remanentes). Sin embargo, la disrupci&oacute;n espec&iacute;fica de LRP no es causa de dislipidemia; este defecto s&oacute;lo se observa si coexiste con menor funci&oacute;n del receptor de LDL. Por el contrario, estas anormalidades son la causa principal de la hipertrigliceridemia en la infecci&oacute;n aguda y en el s&iacute;ndrome de desgaste, condici&oacute;n en que la producci&oacute;n hep&aacute;tica de lipoprote&iacute;nas est&aacute; disminuida. </font></p>     <p align="left"><font size="2" face="Verdana"><B><i>&bull; Factores gen&eacute;ticos. </I>   </B> Existen diferencias en el perfil de l&iacute;pidos por la presencia de distintos polimorfismos de las apolipoprote&iacute;nas E y C-III. El alelo e2 se asocia a niveles m&aacute;s altos de triglic&eacute;ridos. <SUP>52,53</SUP></font></p>     <p align="left"><font size="2" face="Verdana"><B><i>&bull; Metabolismo de las HDL </I>   </B> . Los niveles bajos de colesterol HDL se explican por la menor actividad de la lipasa lipoproteica, enzima responsable de un porcentaje importante de la s&iacute;ntesis de las HDL. Adem&aacute;s, si existen niveles altos de triglic&eacute;ridos, la hipertrigliceridemia por s&iacute; misma es causa de colesterol HDL bajo (por aumento de depuraci&oacute;n de la HDL enriquecidas en triglic&eacute;ridos). Se requieren de estudios de cin&eacute;tica de HDLs en humanos tratados con diversos antirretrovirales. </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font size="2" face="Verdana">Los datos presentados demuestran que existen huecos significativos en el estudio de la dislipidemia asociada al VIH. Muchos de los estudios son retrospectivos o no han controlado la presencia de variables confusoras. Se requieren estudios que analicen la interacci&oacute;n de factores gen&eacute;ticos con los eventos asociados a la infecci&oacute;n por VIH. Se necesitan estudios en poblaciones que tienen prevalencia alta de algunas formas de dislipidemias (ej. colesterol HDL bajo/hipertrigliceridemia) o en individuos con s&iacute;ndrome metab&oacute;lico.</font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>RESISTENCIA A LA INSULINA </b></font></p>     <p align="left"><font size="2" face="Verdana">Estudios longitudinales revelan que la resistencia a la insulina precede, generalmente, a la lipodistrofia. <SUP>54</SUP> Existe resistencia a la insulina en voluntarios sanos bajo tratamiento con indinavir, cuatro semanas despu&eacute;s del inicio del tratamiento, aun en ausencia de cambios en la composici&oacute;n corporal o en la distribuci&oacute;n de grasa corporal; esto sugiere que se trata de un efecto directo del tratamiento con IP. <SUP>55,56</SUP> La consecuencia cl&iacute;nica de la resistencia a la insulina es el s&iacute;ndrome metab&oacute;lico. En pacientes italianos con VIH, la prevalencia del s&iacute;ndrome metab&oacute;lico es 45.4%; esta tasa es m&aacute;s del doble de la observada en poblaci&oacute;n general y mayor que en individuos sanos &gt; 60 a&ntilde;os. <SUP>17</SUP> Los componentes del s&iacute;ndrome fueron: hiperglucemia o diabetes (24%), obesidad central (37.8%), hipertensi&oacute;n (42.3%), hipertrigliceridemia (59.3%) y niveles bajos de colesterol HDL (52.4%). <SUP>17</SUP> No existen estudios sobre la prevalencia del s&iacute;ndrome en otras poblaciones. </font></p>     <p align="left"><font size="2" face="Verdana">Los mecanismos por los que puede existir resistencia a la insulina en pacientes con VIH son: </font></p>     <p align="left"><font size="2" face="Verdana"><B><i>1. Efecto del virus VIH y de la redistribuci&oacute;n de la grasa corporal. </I> </B> Cualquier infecci&oacute;n (aguda o cr&oacute;nica) es causa de resistencia a la insulina; la infecci&oacute;n por VIH no es excepci&oacute;n. </font></p>     <p align="left"><font size="2" face="Verdana"><B><i>2. Efecto de TARAA </I> </B> . Los IPs inhiben la actividad del transportador de glucosa GLUT-4. <SUP>54,57-60</SUP> No se conoce con certeza su patog&eacute;nesis (<a href="/img/revistas/ric/v56n2/n2a10f2.jpg" target="_blank">Figura 2</a>). Los IPs pueden unirse a las prote&iacute;nas de uni&oacute;n del &aacute;cido retinoico en el citoplasma y a las prote&iacute;nas relacionadas con receptores de lipoprote&iacute;nas, disminuyen la activaci&oacute;n de los receptores del &aacute;cido retinoico y de los receptores PPAR&gamma;. A&uacute;n en pacientes sin VIH, el indinavir disminuye la utilizaci&oacute;n de glucosa, sin modificar la composici&oacute;n corporal, lo que sugiere un efecto directo de los antirretrovirales. Los pacientes que toman TARAA tienen una reducci&oacute;n de aproximadamente 50% en la utilizaci&oacute;n total de la glucosa estimulada por insulina y de su consumo por v&iacute;as oxidativa y no oxidativa. El consumo muscular de glucosa es 66%. <SUP>61-65</SUP> Los ITRN pueden afectar la funci&oacute;n mitocondrial y el metabolismo de adipocitos al inhibir la DNA polimerasa &gamma;, lo que puede conducir a depleci&oacute;n progresiva del DNA mitocondrial, alteraci&oacute;n en la transcripci&oacute;n, la s&iacute;ntesis y p&eacute;rdida de la funci&oacute;n de fosforilaci&oacute;n oxidativa.</font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B><i>3. Efectos de la redistribuci&oacute;n de grasa. </I> </B> La resistencia a la insulina es m&aacute;s frecuente si existe lipodistrofia. Treinta y cinco por ciento de los pacientes con VIH con lipodistrofia tiene intolerancia a la glucosa comparado con 5% de los controles; los porcentajes correspondientes de diabetes son 7 y 0.5%, respectivamente. <SUP>57,58</SUP> Existe asociaci&oacute;n positiva entre la circunferencia de cintura y la insulina de ayuno y negativa con la circunferencia del muslo; por lo tanto, el aumento en la grasa visceral como la disminuci&oacute;n en la grasa subcut&aacute;nea contribuyen a la resistencia a la insulina. <SUP>57</SUP> Ambos mecanismos aumentan los &aacute;cidos grasos libres circulantes, probable mecanismo de la resistencia a la insulina. Adem&aacute;s estos casos tienen concentraciones bajas de adiponectina <SUP>60-64</SUP> , hormona producida por la c&eacute;lula adiposa que tiene acciones positivas sobre la acci&oacute;n de la insulina y protege contra el desarrollo de la aterosclerosis. Tambi&eacute;n se han descrito cambios en la acci&oacute;n de la leptina, hormona que al sustituirse tiene efectos favorables en la distribuci&oacute;n de la grasa corporal. <SUP>60,63,64</SUP> Otras hormonas producidas en la c&eacute;lula adiposa como la resistina, el factor de crecimiento parecido a la insulina (IGF), la visfatina (hormonas recientemente descritas), la interleucina-6 y el factor de necrosis tumoral alfa participan en este proceso, sin embargo, la evidencia no es concluyente en pacientes con VIH. <SUP>64</SUP></font></p>     <p align="left"><font size="2" face="Verdana">La resistencia a la insulina causa alteraciones que favorecen la progresi&oacute;n de la ateroesclerosis. La funci&oacute;n endotelial cambia favoreciendo la adhesi&oacute;n de c&eacute;lulas a la superficie celular y su capacidad para inducir vasodilataci&oacute;n disminuye. <SUP>66,67</SUP> La hiperinsulinemia promueve el crecimiento y migraci&oacute;n de las c&eacute;lulas vasculares de m&uacute;sculo liso. La resistencia a la insulina es causa de dislipidemia y niveles altos de PAI-1 y tPA. El tratamiento con metformin disminuye significativamente los niveles de estas dos prote&iacute;nas y de insulina, lo que sugiere que los medicamentos que sensibilizan a la insulina pueden mejorar el perfil de riesgo cardiovascular en estos pacientes. <SUP>14,15</SUP></font></p>     ]]></body>
<body><![CDATA[<p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>HIPERTENSI&Oacute;N ARTERIAL SIST&Eacute;MICA</b> </font></p>     <p align="left"><font size="2" face="Verdana">La hipertensi&oacute;n arterial sist&eacute;mica es una parte importante del s&iacute;ndrome metab&oacute;lico. Pese a ello, la hipertensi&oacute;n arterial no es frecuente en pacientes que reciben TARAA. En el estudio DAD, la prevalencia de hipertensi&oacute;n fue de 8.5%. La historia familiar de hipertensi&oacute;n, la lipodistrofia y el s&iacute;ndrome metab&oacute;lico son m&aacute;s frecuentes en sujetos con hipertensi&oacute;n. <SUP>68</SUP> Probablemente la edad de los sujetos afectados (adultos j&oacute;venes) es una explicaci&oacute;n para la prevalencia. De ser cierta, en el futuro se observar&aacute; un aumento notable de su incidencia.</font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>S&Iacute;NDROME DE LIPODISTROFIA</b> </font></p>     <p align="left"><font size="2" face="Verdana">La lipodistrofia inicia con la p&eacute;rdida del tejido adiposo subcut&aacute;neo en la cara, en la pared abdominal y en las extremidades. M&aacute;s adelante, la grasa se deposita en sitios anormales como las v&iacute;sceras intraabdominales, el cuello, sobre la columna dorsocervical (giba de b&uacute;falo) y en el t&oacute;rax superior (<a href="#c3">Cuadro 3</a>). Estos cambios se asocian a disminuci&oacute;n de la acci&oacute;n de la insulina y dislipidemia. <SUP>68-71</SUP> La prevalencia de lipodistrofia es muy variable (8-84%) debido a las diferencias en los criterios diagn&oacute;sticos, en la selecci&oacute;n de la poblaci&oacute;n estudiada y la duraci&oacute;n del seguimiento. En promedio, la prevalencia es de 42% en pacientes tratados con IPs. La prevalencia es proporcional a la duraci&oacute;n del tratamiento (17% en aquellos tratados con IP por menos de un a&ntilde;o vs. 43% en aquellos con m&aacute;s de un a&ntilde;o de tratamiento). Por cada seis meses de tratamiento con TARAA, el riesgo de lipodistrofia aumenta 45%. La incidencia es mayor con indinavir que con amprenavir, en pacientes que reciben inhibidores de proteasas, en mujeres, y con la adici&oacute;n de IP al tratamiento dual con ITR (riesgo 13 veces mayor). <SUP>60,69,70</SUP></font></p>     <p align="center"><a name="c3"></a></p>     <p align="center"><font size="2" face="Verdana"><img src="/img/revistas/ric/v56n2/n2a10c3.jpg"></font></p>     <p align="center">&nbsp;</p>     <p align="left"><font size="2" face="Verdana">Hasta hace poco tiempo no exist&iacute;an criterios objetivos de diagn&oacute;stico. Recientemente se desarroll&oacute; una escala objetiva que incorpora 10 variables cl&iacute;nicas, metab&oacute;licas y de composici&oacute;n corporal, y que puede diagnosticar lipodistrofia con una eficacia de 80%, adem&aacute;s de ser &uacute;til tanto en mujeres como en hombres. <SUP>71,72</SUP> Cada variable tiene una puntuaci&oacute;n. El total de los puntos se resta de una constante; si el resultado es igual o mayor a cero se considera como positivo el diagn&oacute;stico. Utilizando esta escala, la proporci&oacute;n de pacientes con VIH y lipodistrofia v&iacute;rgenes a TARAA, con TARAA, pero sin IP y con IP fue de 5, 39 y 59%, respectivamente. <SUP>72</SUP> Esta escala permitir&aacute; una comparaci&oacute;n adecuada entre diferentes estudios; tiene como limitante que el patr&oacute;n de oro sobre la que fue construida fue la apreciaci&oacute;n subjetiva del m&eacute;dico o del paciente <SUP>72</SUP>   (<a href="/img/revistas/ric/v56n2/n2a10c4.jpg" target="_blank">Cuadro 4</a>).</font></p>     ]]></body>
<body><![CDATA[<p align="left"><font size="2" face="Verdana">Los IPs es uno de los factores m&aacute;s importantes para el desarrollo de la lipodistrofia. <SUP>60,70</SUP> El tiempo promedio de inicio puede variar, siendo m&aacute;s corto con ritonavir y saquinavir, que con indinavir o nelfinavir. <SUP>2</SUP> Tambi&eacute;n se ha observado con el uso de ITRN, <SUP>72</SUP> aunque se requiere tratamiento de larga duraci&oacute;n para desarrollar este efecto. <SUP>70</SUP>   La lipodistrofia asociada a ITRN puede estar relacionada con toxicidad mitocondrial.  <SUP>4</SUP> Sin embargo, estos pacientes tambi&eacute;n presentan p&eacute;rdida reciente de peso, fatiga, n&aacute;usea, hepatomegalia, disfunci&oacute;n hep&aacute;tica y concentraciones elevadas de &aacute;cido l&aacute;ctico. Por lo anterior, es posible que la p&eacute;rdida de grasa y la acumulaci&oacute;n de la misma en pacientes tratados s&oacute;lo con ITRN, represente un trastorno distinto al s&iacute;ndrome de lipodistrofia que se observa en los pacientes tratados con IPs. <SUP>70</SUP></font></p>     <p align="left"><font size="2" face="Verdana">La lipodistrofia est&aacute; asociada positivamente con la duraci&oacute;n de la infecci&oacute;n por VIH. Existe controversia sobre la relevancia de la carga viral previa, la cuenta de linfocitos CD4 y el &iacute;ndice de masa corporal basal. <SUP>70-74</SUP>   Pacientes con IMC mayor a 28 kg/m    <SUP>2</SUP> antes del inicio del tratamiento tienen mayor prevalencia de giba dorsal, aumento de regi&oacute;n mamaria y menor prevalencia de p&eacute;rdida de grasa facial y gl&uacute;tea, en comparaci&oacute;n con los que tienen un IMC menor a 20. <SUP>75</SUP></font></p>     <p align="left"><font size="2" face="Verdana">Otros factores asociados a la lipodistrofia son mayor edad, raza blanca, la duraci&oacute;n y severidad de la enfermedad por VIH, tiempo desde la reversi&oacute;n de la progresi&oacute;n cl&iacute;nica de la infecci&oacute;n por VIH y cambios extremos de peso. <SUP>60</SUP> La estavudina se asocia a p&eacute;rdida de grasa subcut&aacute;nea. Los hombres con lipodistrofia tienen mayor riesgo de desarrollar anormalidades metab&oacute;licas y depleci&oacute;n de grasa subcut&aacute;nea. <SUP>76,77</SUP> Finalmente, las pacientes con lipodistrofia tienen niveles m&aacute;s altos de testosterona total y libre comparadas con las no lipodistr&oacute;ficas, sin embargo, mujeres afectadas por el VIH, pero sin lipodistrofia tienen niveles m&aacute;s bajos de andr&oacute;genos en comparaci&oacute;n con las controles. <SUP>78</SUP> La patog&eacute;nesis e implicaciones cl&iacute;nicas de estos hallazgos se desconocen. </font></p>     <p align="left"><font size="2" face="Verdana">No se conocen los mecanismos por los que los IP y los ITRN ocasionan lipodistrofia. El tejido adiposo de estos pacientes se caracteriza por apoptosis de adipocitos, formaci&oacute;n local de lipogranulomas y proliferaci&oacute;n vascular; el DNA mitocondrial del tejido adiposo subcut&aacute;neo est&aacute; disminuido. <SUP>60,70</SUP> Se han propuesto las siguientes explicaciones: </font></p>     <p align="left"><font size="2" face="Verdana">a) Los IP inhiben la diferenciaci&oacute;n de los preadipocitos: en estudios <i>   in vitro </I> , los IP inhiben la acumulaci&oacute;n de triglic&eacute;ridos y la expresi&oacute;n de prote&iacute;nas que intervienen la diferenciaci&oacute;n de los preadipocitos (FABP: la prote&iacute;na de uni&oacute;n a &aacute;cidos grasos y la glicerol-3-fosfato deshidrogenasa). Los IPs inhiben la prote&iacute;na de uni&oacute;n al &aacute;cido cis-9 retinoico (a trav&eacute;s del receptor X de retinoides), el cual tiene similitud con el sitio activo de la proteasa del VIH. Adem&aacute;s, la regi&oacute;n catal&iacute;tica de esta proteasa tiene una homolog&iacute;a de 60% con la secuencia del dominio de uni&oacute;n a l&iacute;pidos del receptor de LDL y de la regi&oacute;n C-terminal de la prote&iacute;na de uni&oacute;n tipo I del &aacute;cido retinoico (CRABP-I). El receptor X de retinoides forma un complejo con el receptor activado de proliferador de peroxisomas &gamma; (PPAR &gamma;), el cual aumenta la transcripci&oacute;n de genes que rescatan a los adipocitos de la apoptosis y aumentan su diferenciaci&oacute;n. Debido a que los receptores PPAR &gamma; se expresan principalmente en el tejido adiposo perif&eacute;rico, es posible que la inhibici&oacute;n de la CRABP-I por los IP pueda resultar en apoptosis y alteraci&oacute;n en la diferenciaci&oacute;n de los adipocitos perif&eacute;ricos, con menor afecci&oacute;n de los adipocitos intraabdominales y viscerales. </font></p>     <p align="left"><font size="2" face="Verdana">b) La lipodistrofia asociada a VIH/TARAA como resultado de las interacciones entre factores virales y los medicamentos antirretrovirales: antes del inicio del tratamiento, los linfocitos CD4 son predominantemente del tipo Th 2 y secretan citocinas inflamatorias como IL-4 e IL-10. Con el tratamiento, el perfil de los linfocitos CD4 cambia al subtipo Th1, los cuales secretan principalmente IL-2, interfer&oacute;n gamma, y factor de necrosis tumoral-alfa (FNT-&alpha;). Adem&aacute;s, las prote&iacute;nas del VIH como el Tat pueden activar el factor nuclear-kappa &beta; con la subsecuente inducci&oacute;n del FNT-&alpha;. El aumento del FNT-&alpha; (y la consecuente producci&oacute;n de interleucina 6) puede mediar los cambios metab&oacute;licos observados en la lipodistrofia, ya que inhibe la captaci&oacute;n de &aacute;cidos grasos libres por los adipocitos, estimula la lip&oacute;lisis y estimula la producci&oacute;n hep&aacute;tica de lipoprote&iacute;nas. Adem&aacute;s, el FNT-&alpha; produce resistencia a la insulina. <SUP>60</SUP></font></p>     <p align="left"><font size="2" face="Verdana">c) La disminuci&oacute;n del DNA mitocondrial del tejido adiposo subcut&aacute;neo puede ser secundaria a inhibici&oacute;n de la DNA polimerasa gamma inducida por los ITRN: en casos con lipodistrofia existe menor expresi&oacute;n de los genes de PPAR-&gamma; y PGC-1 (coactivador 1 del receptor gamma activado del proliferador de peroxisomas). Este coactivador es indispensable para la biog&eacute;nesis mitocondrial. En el grupo con lipodistrofia se encontr&oacute;, adem&aacute;s, disminuci&oacute;n en la expresi&oacute;n de la acetil coenzima A sintetasa y lipoprote&iacute;n lipasa, as&iacute; como de la concentraci&oacute;n del RNAm del GLUT-4, mientras que las concentraciones del RNAm de CD45 e IL-6 fueron significativamente m&aacute;s altas en este grupo. <SUP>79</SUP></font></p>     <p align="left"><font size="2" face="Verdana">d) Hipercortisolismo. El ritmo circadiano del cortisol es normal. Sin embargo, el cortisol puede sintetizarse localmente en el tejido adiposo visceral por la enzima 11&beta;-hidroxiesteroide deshidrogenasa tipo 1 (conversi&oacute;n de cortisona a cortisol). Una concentraci&oacute;n elevada de glucocorticoides a nivel local, aun sin hipercortisolismo sist&eacute;mico, pueda inducir adiposidad regional; sin embargo, no se ha demostrado que este mecanismo sea la causa de esta anormalidad. <SUP>70</SUP></font></p>     <p align="left"><font size="2" face="Verdana">Se debe hacer diagn&oacute;stico diferencial con otras causas de lipodistrofia. Es com&uacute;n observar una p&eacute;rdida generalizada de grasa en aquellos con s&iacute;ndrome por desgaste; generalmente se ven cl&iacute;nicamente enfermos por una carga viral alta, con una p&eacute;rdida significativa de peso que involucra tanto masa corporal magra como grasa. Los pacientes con s&iacute;ndrome de desgaste no tienen alteraciones en la tolerancia a la glucosa o hiperinsulinemia, aunque pueden tener hipertrigliceridemia. Otras causas son alcoholismo, tratamiento con esteroides o testosterona.</font></p>     <p align="left">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="left"><font size="2" face="Verdana"><b>HIPERLACTATEMIA</b> </font></p>     <p align="left"><font size="2" face="Verdana">Existen m&uacute;ltiples reportes de acidosis l&aacute;ctica y esteatosis hep&aacute;tica en pacientes con VIH en tratamiento con ITRN. Sin embargo, los estudios prospectivos demuestran que la acidosis l&aacute;ctica o la esteatosis hep&aacute;tica severas son muy poco frecuentes. El cuadro cl&iacute;nico por la hiperlactatemia var&iacute;a desde severo, compensado cr&oacute;nico o asintom&aacute;tico. La hiperlactatemia puede ocurrir tambi&eacute;n por otras causas como hipoxia, sepsis, deficiencia de tiamina, intoxicaci&oacute;n por alcohol, trastornos mitocondriales o neoplasias. </font></p>     <p align="left"><font size="2" face="Verdana">En la hiperlactacidemia compensada asintom&aacute;tica se encuentran niveles de lactato menores 2.5 mmol/l de manera cr&oacute;nica o intermitente; en general, no se acompa&ntilde;a de alteraciones en las pruebas de funci&oacute;n hep&aacute;tica. En este caso existe un mayor recambio de lactato, probablemente por toxicidad mitocondrial. Al realizar ejercicio, la tasa de eliminaci&oacute;n del lactato es similar a la de los pacientes control. Se presenta en los primeros seis meses de tratamiento y es m&aacute;s frecuente con la estavudina, en especial en combinaci&oacute;n con didanosina. <SUP>80</SUP></font></p>     <p align="left"><font size="2" face="Verdana">La incidencia de lactacidemia sintom&aacute;tica oscila entre 12 y 14.5 por 1,000 personas por a&ntilde;o; la incidencia de acidosis l&aacute;ctica var&iacute;a entre 1.3 y 8.3 casos por 1,000 personas por a&ntilde;o. <SUP>80</SUP> La etapa inicial se manifiesta por n&aacute;usea, v&oacute;mito, anorexia, dolor abdominal o distensi&oacute;n, hepatomegalia dolorosa, fatiga y postraci&oacute;n, inicialmente con pH normal. Este cuadro puede evolucionar r&aacute;pidamente a acidosis metab&oacute;lica con hiperventilaci&oacute;n, arritmias y falla org&aacute;nica; tambi&eacute;n se puede presentar pancreatitis y elevaci&oacute;n de creatinfosfoquinasa. La infecci&oacute;n con hepatitis B y C es m&aacute;s frecuente en este grupo. Existe esteatosis hep&aacute;tica microvesicular. Concentraciones mayores de 5 mmol/l se observan generalmente en acidosis l&aacute;ctica y se asocian con una alta mortalidad. Las muestras deber&aacute;n obtenerse en tubos con fl&uacute;or y ser colocadas inmediatamente en hielo, as&iacute; como evitar el uso de torniquete, ya que puede aumentar artificialmente su concentraci&oacute;n. Lo m&aacute;s importante es el reconocimiento temprano de esta entidad, la suspensi&oacute;n del medicamento causante, as&iacute; como apoyo ventilatorio y hemodin&aacute;mico en una Unidad de Cuidados Intensivos. En casos de extrema gravedad se requiere el uso de hemodi&aacute;lisis y se han utilizado los siguientes medicamentos, algunos de manera emp&iacute;rica: tiamina endovenosa, riboflavina, L-carnitina, coenzima Q y vitamina C. <SUP>80</SUP></font></p>     <p align="left"><font size="2" face="Verdana">Es conveniente que se tenga siempre en mente esta complicaci&oacute;n y, en su caso, cambiar la clase del medicamento utilizado. Por otro lado, el hallazgo incidental de niveles moderadamente elevados de lactato puede ser un artefacto o reflejar &uacute;nicamente una hiperlactatemia compensada en donde no se requiere ninguna intervenci&oacute;n. <SUP>80</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>VIGILANCIA DE LOS CAMBIOS METAB&Oacute;LICOS ASOCIADOS CON LA TARAA </b></font></p>     <p align="left"><font size="2" face="Verdana">No existe un consenso sobre el diagn&oacute;stico y tratamiento de los efectos adversos producidos por el tratamiento antirretroviral. En relaci&oacute;n con la lipodistrofia, &eacute;sta puede diagnosticarse a la inspecci&oacute;n visual por la combinaci&oacute;n de obesidad abdominal con p&eacute;rdida de la grasa subcut&aacute;nea. Es necesario desarrollar gu&iacute;as sensibles y espec&iacute;ficas para el diagn&oacute;stico y seguimiento en estos pacientes que, al mismo tiempo, sean costo-eficientes. Para la medici&oacute;n de la distribuci&oacute;n de grasa corporal se han utilizado numerosos m&eacute;todos, como son la tomograf&iacute;a computada, resonancia magn&eacute;tica, absorciometr&iacute;a rayos X dual (DEXA), y an&aacute;lisis de impedancia bioel&eacute;ctrica. Esto puede utilizarse en conjunto con la medici&oacute;n del grosor de pliegues d&eacute;rmicos, relaci&oacute;n cintura/cadera, fotograf&iacute;as, o cuestionarios para evaluar cambios detectados por el mismo paciente. El uso de DEXA no es muy preciso, ya que es bidimensional y aunque cuantifica la grasa total, no distingue entre grasa visceral y subcut&aacute;nea en el tronco. Por otro lado, la resonancia magn&eacute;tica (RM) y la tomograf&iacute;a axial computada (TAC) producen im&aacute;genes tridimensionales; sin embargo, su desventaja es el costo; una alternativa menos costosa es utilizar cortes &uacute;nicos de TAC (entre L4 y muslo). Es evidente que se requiere la estandarizaci&oacute;n y m&eacute;todos m&aacute;s sensibles para evaluar este tipo de cambios y poder definir y diagnosticar las complicaciones metab&oacute;licas asociadas con la TARAA. De momento, se recomienda la medici&oacute;n en cada visita de la estatura y peso. Tambi&eacute;n son &uacute;tiles fotograf&iacute;as, talla del sost&eacute;n en mujeres, la evaluaci&oacute;n subjetiva por el paciente, la circunferencia de cintura, el examen f&iacute;sico de piernas, brazos y cara en busca de signos de lipoatrofia, y del per&iacute;metro del cuello, abdomen y regi&oacute;n mamaria femenina en busca de hipertrofia. <SUP>81</SUP></font></p>     <p align="left"><font size="2" face="Verdana">Para la evaluaci&oacute;n de la dislipidemia, se han adoptado las recomendaciones usadas en poblaci&oacute;n sin VIH, debido a que no existen datos suficientes para estimar el riesgo cardiovascular de estos casos.82,83 Se sugiere medir un perfil de l&iacute;pidos en ayuno antes de iniciar la TARAA y repetirlo en un lapso de tres a seis meses. Ya que no se han establecido metas espec&iacute;ficas de niveles de colesterol LDL en pacientes con infecci&oacute;n por VIH, la AACTG (Adult AIDS Clinical Trial Group Cardiovascular Disease Focus Group) recomienda aplicar las gu&iacute;as de la NCEP (National Cholesterol Education Program), que sugieren establecer la meta de niveles de colesterol LDL de acuerdo al riesgo cardiovascular. En el tercer reporte de la NCEP se identific&oacute; al s&iacute;ndrome metab&oacute;lico como meta secundaria, debido a la evidencia en su participaci&oacute;n en el riesgo de enfermedad coronaria. El uso de las tablas de Framingham, propuesto por el NCEP no ha sido validado en poblaciones latinoamericanas (y menos a&uacute;n en pacientes con VIH). Por ello, es opini&oacute;n de los autores que su empleo para estimar el riesgo cardiovascular en pacientes mexicanos con infecci&oacute;n por VIH no puede ser recomendado. Se sugiere identificar cuantas causas secundarias existan (consumo de alcohol, diabetes, f&aacute;rmacos, etc.) y en casos con valores de colesterol y/o triglic&eacute;ridos mayores de 300 mg/dL o con historia familiar de dislipidemia, diabetes o cardiopat&iacute;a isqu&eacute;mica hacer la b&uacute;squeda intencionada de hiperlipidemias primarias. <SUP>82</SUP></font></p>     <p align="left"><font size="2" face="Verdana">La evaluaci&oacute;n de pacientes con resistencia a la insulina tambi&eacute;n es motivo de controversia. No se ha definido el m&eacute;todo id&oacute;neo ni la frecuencia de tamizaje para diabetes mellitus en pacientes con VIH. A&uacute;n es controversial si todos los pacientes con VIH deben ser evaluados de manera rutinaria con este fin. <SUP>84</SUP></font></p>     ]]></body>
<body><![CDATA[<p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>TRATAMIENTO </b></font></p>     <p align="left"><font size="2" face="Verdana">El tratamiento de las alteraciones metab&oacute;licas incluye terapia nutricional, ejercicio y la eliminaci&oacute;n de otros factores de riesgo como tabaquismo y alcoholismo. El objetivo es mantener niveles normales de l&iacute;pidos s&eacute;ricos, glucosa, peso y presi&oacute;n arterial a largo plazo. La dieta y el ejercicio pueden ayudar a las metas deseadas, sin embargo, no suele revertir la p&eacute;rdida de grasa subcut&aacute;nea. Pocos estudios han evaluado el efecto de la dieta; sus resultados son poco alentadores. <SUP>85,86</SUP> Se deber&aacute; tener cuidado en evitar restricci&oacute;n cal&oacute;rica inadecuada en pacientes que ya han perdido peso a consecuencia de lipoatrofia severa. </font></p>     <p align="left"><font size="2" face="Verdana">Una pr&aacute;ctica com&uacute;n es cambiar el tipo de f&aacute;rmaco sin sacrificar eficacia antirretroviral con el fin de reducir las complicaciones metab&oacute;licas asociadas a la TARAA. Los resultados han sido variables. La sustituci&oacute;n de un IP por nevirapina disminuye la p&eacute;rdida de grasa en cara y brazos y disminuye los niveles de l&iacute;pidos en 57%. <SUP>87,88</SUP> El cambio de un IP por abacavir aumenta la sensibilidad a la insulina y disminuye los niveles de colesterol y triglic&eacute;ridos en la mayor&iacute;a de los pacientes. <SUP>89</SUP> En resumen, la mayor&iacute;a de los estudios muestran una disminuci&oacute;n de los niveles de triglic&eacute;ridos al cambiar un IP por un ITRNN (nevirapina o efavirenz), un ITRN (abacavir) u otro IP (nelfinavir). <SUP>90</SUP> En contraste, la hipercolesterolemia y la redistribuci&oacute;n de grasa tienden a persistir a pesar de descontinuar el tratamiento con IP. <SUP>17</SUP> El atazanavir parece tener un efecto m&aacute;s favorable en el perfil de l&iacute;pidos. <SUP>37</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Dislipidemia </B></font></p>     <p align="left"><font size="2" face="Verdana">Si no se logra la normalizaci&oacute;n del perfil de l&iacute;pidos con dieta y ejercicio, se pueden utilizar tratamiento con f&aacute;rmacos (<a href="/img/revistas/ric/v56n2/n2a10c5.jpg" target="_blank">Cuadro 5</a>). La mayor&iacute;a de los IP son metabolizados por el citocromo p4503A4, lo que aumenta la concentraci&oacute;n sangu&iacute;nea de los f&aacute;rmacos hipolipemiantes y el riesgo de miopat&iacute;a. Todos los IP inhiben esta enzima, siendo ritonavir el m&aacute;s potente. En un estudio de farmacocin&eacute;tica que combin&oacute; diferentes estatinas con ritonavir, los niveles de simvastatina aumentaron 32 veces, los de atorvastatina 4.5 y los de pravastatina disminuyeron 0.5 veces. <SUP>17</SUP> El riesgo es bajo con el uso de estatinas como &uacute;nico medicamento (&lt; 0.5%), <SUP>91</SUP>   pero aumenta al combinarlas con fibratos (5%).    <SUP>92</SUP> En la experiencia publicada no hubo casos de miopat&iacute;a en 49 pacientes que tomaron un IP y pravastatina o atorvastatina y en 19 pacientes con IP m&aacute;s atorvastatina y gemfibrozil. <SUP>17</SUP> El gem-fibrozil tambi&eacute;n es un inhibidor potente de este citocromo. Por ello no se recomienda el uso de este fibrato en pacientes que reciben antirretrovirales. <SUP>93,94</SUP> Varios estudios han evaluado la eficacia de los fibratos y las estatinas en pacientes con VIH. Su eficacia es similar a la observada en poblaci&oacute;n general.</font></p>     <p align="left"><font size="2" face="Verdana">La hipertrigliceridemia severa tiene como complicaci&oacute;n a la pancreatitis aguda. Casos con episodios previos de pancreatitis o con hepatomegalia dolorosa se consideran en alto riesgo. Se recomienda el ayuno bajo vigilancia intrahospitalaria para estos casos; lo mismo es aplicable para pacientes con diabetes. El uso de una dieta baja en grasa (&lt; 10%) y az&uacute;cares simples con alto contenido de fibra es la alternativa a usar en pacientes externos. El ritonavir es el IP asociado con m&aacute;s frecuencia a este efecto adverso; debe ser sustituido por otro antirretroviral. Al tratamiento se agrega un fibrato una vez que los triglic&eacute;ridos est&eacute;n por debajo de 500 mg/dL. En pacientes sin riesgo de pancreatitis, la terapia hipolipemiante debe dirigirse hacia la meta de reducir el riesgo cardiovascular. Las estatinas son los medicamentos m&aacute;s eficaces para disminuir las concentraciones de colesterol LDL, y disminuyen parcialmente los triglic&eacute;ridos. Los fibratos son &uacute;tiles en pacientes con hipertrigliceridemia. En casos con elevaciones de colesterol y triglic&eacute;ridos, el uso combinado de fibratos y estatinas es necesario en un alto porcentaje. Sin embargo, esta combinaci&oacute;n aumenta el riesgo de miopat&iacute;a. Los casos con colesterol HDL bajo e hipertrigliceridemia deber&aacute;n ser tratados con un fibrato; la sola correcci&oacute;n de la cifra de triglic&eacute;ridos normalizar&aacute; el nivel de colesterol HDL cuatro a ocho semanas despu&eacute;s. Los pacientes con colesterol HDL bajo sin hipertrigliceridemia se tratan con ejercicio aer&oacute;bico, suspensi&oacute;n de tabaco y correcci&oacute;n de todas las causas secundarias posibles. El uso de f&aacute;rmacos en esta condici&oacute;n se limita a sujetos de alto riesgo. Dado que la prevenci&oacute;n de eventos vasculares puede observarse s&oacute;lo a largo plazo, los especialistas deber&aacute;n reservar esta intervenci&oacute;n para pacientes con riesgo cardiovascular y un pron&oacute;stico favorable de la enfermedad de base. <SUP>17</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Diabetes mellitus y resistencia a la insulina </B></font></p>     ]]></body>
<body><![CDATA[<p align="left"><font size="2" face="Verdana">El metformin disminuye los niveles de PAI-1 y tPA, as&iacute; como la insulinemia en estos pacientes. <SUP>95</SUP> Las dosis de metformin que se han utilizado en este tipo de pacientes son: 850 mg tres veces al d&iacute;a durante ocho semanas, con una disminuci&oacute;n significativa de la resistencia a la insulina y adiposidad troncal; tambi&eacute;n disminuye el peso corporal y la circunferencia de cintura <SUP>14,15</SUP> (<a href="/img/revistas/ric/v56n2/n2a10c5.jpg" target="_blank">Cuadro 5</a>). Los agonistas PPAR gamma, como pioglitazona o rosiglitazona, pueden disminuir los niveles de glucosa y las complicaciones metab&oacute;licas, adem&aacute;s de que parecen revertir los defectos mitocondriales asociados con la TARAA y aumentar la adipog&eacute;nesis subcut&aacute;nea. En un estudio reciente con rosiglitazona (8 mg/d durante seis a 12 semanas) hubo mejor&iacute;a en la resistencia a la insulina y en la distribuci&oacute;n de grasa corporal en algunos pacientes; <SUP>96</SUP> lo mismo hab&iacute;a sido descrito con la troglitazona. <SUP>97</SUP> El uso del metformin y las tiazolidinedionas a&uacute;n se considera en estudio y no se recomienda para todos los casos con lipodistrofia. El tratamiento de la hiperglucemia y la diabetes tipo 2 es el mismo que en la poblaci&oacute;n general; en pacientes con lipodistrofia la respuesta es menor. </font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Lipodistrofia </B></font></p>     <p align="left"><font size="2" face="Verdana">No existe ning&uacute;n tratamiento eficaz. En 1996 se aprob&oacute; el uso de hormona de crecimiento recombinante (GHrh) para el tratamiento del desgaste asociado a VIH. Adem&aacute;s, la hormona de crecimiento se ha usado en forma experimental en casos con lipodistrofia. No existe deficiencia de hormona de crecimiento en pacientes con VIH y lipodistrofia, sin embargo, se han encontrado concentraciones menores de GH durante la noche y disminuci&oacute;n en la respuesta de GH a GHrh, a pesar de que los pulsos de GH y las concentraciones de IGF-1 permanezcan en l&iacute;mites normales. <SUP>98</SUP> La grasa visceral disminuye despu&eacute;s del uso de GHrh en hombres sin VIH con obesidad abdominal. <SUP>99</SUP> En pacientes con VIH, utilizando dosis farmacol&oacute;gicas de GHrh se observ&oacute; mejor&iacute;a en la distribuci&oacute;n de grasa; sin embargo, hubo deterioro en la tolerancia a la glucosa. Otros grupos emplearon dosis menores (3 mg/d&iacute;a); pese a ello, se observ&oacute; disminuci&oacute;n en la disposici&oacute;n de glucosa mediada por insulina al mes de tratamiento. Este defecto es reversible a los seis meses de tratamiento. <SUP>100</SUP> Las dosis bajas mejoran los niveles de l&iacute;pidos despu&eacute;s de seis meses de empleo. El uso de 4 mg/d por 12 semanas disminuye la grasa central. <SUP>35</SUP> La dosis de 6 mg/d&iacute;a disminuye la grasa visceral en mayor porcentaje que los esquemas con dosis bajas, sin embargo, se asocian con mayor riesgo de tener hiperglucemia. Por lo anterior, el uso de GHrh no puede recomendarse para el tratamiento de la lipodistrofia asociada a VIH/TARAA. Finalmente, en estudios recientes se observ&oacute; eliminaci&oacute;n de la resistencia a la insulina despu&eacute;s de la coadministraci&oacute;n de leptina y adiponectina en un modelo murino de diabetes lipoatr&oacute;fica. Por lo anterior, se requieren estudios que exploren el uso de adiponectina sola o con leptina, o bien an&aacute;logos de los mismos como otra opci&oacute;n de tratamiento. <SUP>59,63</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>CONCLUSIONES </b></font></p>     <p align="left"><font size="2" face="Verdana">Ante los retos que representa el n&uacute;mero creciente de casos de infecci&oacute;n por VIH y los altos costos de tratamiento se requiere de pol&iacute;ticas de investigaci&oacute;n en salud que aporten datos &uacute;tiles para dise&ntilde;ar estrategias preventivas de las futuras causas de muerte de los pacientes afectados. Las alteraciones metab&oacute;licas asociadas a TARAA ser&aacute;n una de las principales causas de morbimortalidad en los pr&oacute;ximos a&ntilde;os. Pese a ello, existen grandes vac&iacute;os en su estudio. Muchos de los reportes tienen problemas metodol&oacute;gicos o son cohortes peque&ntilde;as no representativas. En poblaci&oacute;n latinoamericana existe a&uacute;n menos informaci&oacute;n. En pa&iacute;ses, como M&eacute;xico, con prevalencia alta de s&iacute;ndrome metab&oacute;lico, dislipidemias, hipertensi&oacute;n arterial y diabetes tipo 2, es esperable que las alteraciones metab&oacute;licas sean m&aacute;s frecuentes, ya que un factor ambiental (como TARAA) puede hacer evidente la predisposici&oacute;n gen&eacute;tica para sufrir las anormalidades metab&oacute;licas antes descritas. Para poder evaluar con certeza el impacto de las alteraciones metab&oacute;licas en nuestra poblaci&oacute;n, se requiere de registros regionales o nacionales de pacientes con VIH. Entre otras cosas, este instrumento asegurar&iacute;a el poder tener datos epidemiol&oacute;gicos confiables. La interacci&oacute;n entre endocrin&oacute;logos, infect&oacute;logos y otros especialistas ser&aacute; cada vez m&aacute;s frecuente e indispensable en este campo.</font></p>     <p align="left"><font size="2" face="Verdana"><b>REFERENCIAS</b></font></p>     <!-- ref --><p align="left"><font size="2" face="Verdana">1. Palella FJ, Delaney KM, Moorman AC, Loveless MO, Fuhrer J, Satten GA. Declining morbidity and mortality among patients with advanced human immunodeficiency virus infection: HIV Outpatient study investigators. <i>   N Engl J Med </I> 1998; 338: 853-60. </font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6795784&pid=S0034-8376200400020001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="left"><font size="2" face="Verdana">2. 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