<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-8123</journal-id>
<journal-title><![CDATA[Revista Colombiana de Reumatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Reumatol.]]></abbrev-journal-title>
<issn>0121-8123</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Reumatología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-81232008000100002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Gota en el anciano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Restrepo]]></surname>
<given-names><![CDATA[Juan Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pascual]]></surname>
<given-names><![CDATA[Eliseo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Internista y Reumatólogo Universidad de Caldas Universidad de Antioquia]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Miguel Hernández Hospital General Universitario de Alicante sección de reumatología]]></institution>
<addr-line><![CDATA[Alicante ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<volume>15</volume>
<numero>1</numero>
<fpage>55</fpage>
<lpage>58</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-81232008000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-81232008000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-81232008000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La gota es la artritis crónica más común en el anciano. Puede ser fácilmente diagnosticada por la presencia de cristales de urato monosódico al examen microscópico del líquido articular. Existen algunas diferencias clínicas entre la gota del adulto y la del anciano. El tratamiento es altamente efectivo pero puede ocasionar serias reacciones adversas si no se tiene en cuenta la comorbilidad de este grupo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Gout is the most common chronic arthritis in older people that can lead to significant and severe disability. It can be easy diagnosed with the presence of crystals of urate monosodic in the articular fluid. The clinical stages of gout include asymptomatic hyperuricemia, intermittent gouty arthritis, intercritical period and chronic tophaceous gout. There are some differences necessary to recognize to avoid errors in the management. Treatment of acute gout involves the use of NSAIDs, colchicine, corticosteroids or corticotropin (adrenocorticotropic hormone). Profilactic treatment includes the use of allopurinol and uricosuric agents; but all of these drugs could cause serious reactions in the elderly.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[gota]]></kwd>
<kwd lng="es"><![CDATA[anciano]]></kwd>
<kwd lng="es"><![CDATA[cristales de urato monosódico]]></kwd>
<kwd lng="es"><![CDATA[tratamiento]]></kwd>
<kwd lng="es"><![CDATA[febuxostat]]></kwd>
<kwd lng="es"><![CDATA[uricasa]]></kwd>
<kwd lng="en"><![CDATA[gout]]></kwd>
<kwd lng="en"><![CDATA[elderly]]></kwd>
<kwd lng="en"><![CDATA[urate monosodic crystals]]></kwd>
<kwd lng="en"><![CDATA[treatment]]></kwd>
<kwd lng="en"><![CDATA[febuxostat]]></kwd>
<kwd lng="en"><![CDATA[uricase]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <title> </title> <head> <body>  <font face="verdana" size=2>ACTUALIZACI&Oacute;N</font>      <p>    <center><font face="verdana" size=4><b>Gota en el anciano</b></font></center></p>       <p><font face="verdana" size=2>Juan Pablo Restrepo<sup>1</sup>, Eliseo Pascual<sup>2</sup></font></p>  <sup>1</sup> Internista y Reumat&oacute;logo, Universidad de Caldas, Universidad de Antioquia, Colombia.    <br> <sup>2</sup>Profesor y jefe de la secci&oacute;n de reumatolog&iacute;a, Hospital General Universitario de Alicante y Universidad Miguel Hern&aacute;ndez, Alicante, Espa&ntilde;a.    <br>      <p>Recibido para publicaci&oacute;n: enero 4/2008, Aceptado en forma revisada: marzo 7/2008</p>  <hr>  <font face="verdana">      <p><b>Resumen</b></p>      <p>La gota es la artritis cr&oacute;nica m&aacute;s com&uacute;n en el anciano. Puede ser f&aacute;cilmente diagnosticada por la presencia de cristales de urato monos&oacute;dico al examen microsc&oacute;pico del l&iacute;quido articular. Existen algunas diferencias cl&iacute;nicas entre la gota del adulto y la del anciano. El tratamiento es altamente efectivo pero puede ocasionar serias reacciones adversas si no se tiene en cuenta la comorbilidad de este grupo.</p>      <p><b>Palabras clave</b>: gota, anciano, cristales de urato monos&oacute;dico, tratamiento, febuxostat, uricasa.</p>  <hr>      ]]></body>
<body><![CDATA[<p><b>Summary</b></p>      <p>Gout is the most common chronic arthritis in older people that can lead to significant and severe disability. It can be easy diagnosed with the presence of crystals of urate monosodic in the articular fluid. The clinical stages of gout include asymptomatic hyperuricemia, intermittent gouty arthritis, intercritical period and chronic tophaceous gout. There are some differences necessary to recognize to avoid errors in the management. Treatment of acute gout involves the use of NSAIDs, colchicine, corticosteroids or corticotropin (adrenocorticotropic hormone). Profilactic treatment includes the use of allopurinol and uricosuric agents; but all of these drugs could cause serious reactions in the elderly.</p>      <p><b>Key words</b>: gout, elderly, urate monosodic crystals, treatment, febuxostat, uricase.</p>  <hr>        <p><b>Epidemiolog&iacute;a</p></b>       <p>Es la artropat&iacute;a inflamatoria m&aacute;s com&uacute;n en el adulto mayor<sup>1</sup> y su prevalencia en esta poblaci&oacute;n esta en aumento<sup>2,3</sup>, debido a la mayor duraci&oacute;n de la hiperuricemia, enfermedades asociadas como la hipertensi&oacute;n, obesidad, dislipidemia, el uso de medicamentos para tratarlas como diur&eacute;ticos y ASA. La gota es la artritis m&aacute;s frecuente en hombres entre los 40 y 60 a&ntilde;os en una relaci&oacute;n 4: 1 pero la incidencia disminuye 3: 1 en mayores de 65 a&ntilde;os<sup>4</sup>. En el NHIS de 1996 la gota entre personas de 65-74 a&ntilde;os fue reportada de 3,17%<sup>5</sup> y 3,6% en mayores de 75 a&ntilde;os<sup>6</sup>.</p>      <p>En el estudio de Milkus y colaboradores la m&aacute;xima prevalencia ocurri&oacute; entre los 75 y 84 a&ntilde;os, y contin&uacute;a aumentando en las mujeres para presentarse casi exclusivamente por encima de 85 a&ntilde;os<sup>7</sup>.</p>      <p><b>Manifestaciones cl&iacute;nicas</b></p>      <p>La gota presenta cuatro fases<sup>8,9</sup>. Inicialmente ocurre una hiperuricemia asintom&aacute;tica que puede tardar hasta 20 a&ntilde;os y termina cuando aparece la monoartritis aguda la cual es seguida de un periodo intercr&iacute;tico. La gota tof&aacute;cea es la fase final de la enfermedad y determina la cronicidad de la enfermedad. La crisis inflamatoria articular en los inicios es monoarticular de predominio en los miembros inferiores en el 90% de los casos, de los cuales 60% en la primera metatarsofal&aacute;ngica (podagra) seguida por tobillos, talones, rodillas, mu&ntilde;ecas, dedos y codos<sup>10</sup>.</p>      <p>Caracter&iacute;sticamente tiene un comienzo agudo de dolor, edema y eritema que en ocasiones se confunde f&aacute;cilmente con celulitis. El dolor se inicia en la noche; es intenso y aumenta en severidad en las horas siguientes, cuando le impide caminar o no soportar el roce con la s&aacute;bana<sup>10,11</sup> alcanzando su m&aacute;ximo entre las 6 y 12 horas<sup>12</sup>. Esta crisis puede durar de d&iacute;as a semanas y puede resolverse con medicaci&oacute;n o espont&aacute;neamente. Puede ser desencadenada por ejercicio inusual, trauma, cirug&iacute;a, excesos dietarios y de alcohol, enfermedad sist&eacute;mica severa<sup>13</sup>. Si el paciente no recibe tratamiento, las crisis cada vez son m&aacute;s frecuentes y el periodo intercr&iacute;tico es menor. Solo el 50% de los adultos mayores experimentan un ataque agudo monoarticular. El resto presenta un cuadro oligo o poliarticular, frecuentemente afectando las articulaciones de las manos<sup>14-17</sup>. En el anciano es frecuente la afecci&oacute;n poliarticular, la presencia r&aacute;pida de tofos en los sitios de formaci&oacute;n previa de n&oacute;dulos de Heberden y Bouchard<sup>18-22</sup>, la presencia de enfermedades principalmente falla renal cr&oacute;nica y el uso concomitante de diur&eacute;ticos o AINES<sup>23,24</sup> (<a href="#tab2">Tabla 1</a>). En cambio los c&aacute;lculos de &aacute;cido &uacute;rico son raros en esta poblaci&oacute;n<sup>22</sup>. Las causas m&aacute;s comunes de hiperuricemia en el adulto mayor se muestran en la <a href="#tab2">Tabla 2</a><sup>13,25</sup>.</p>       <p><a name="tab1"></a><img src="img/revistas/rcre/v15n1/v15n1a02t1.gif"></p>      ]]></body>
<body><![CDATA[<p><a name="tab2"></a><img src="img/revistas/rcre/v15n1/v15n1a02t2.gif"></p>       <p>Los hallazgos radiol&oacute;gicos incluyen los de la gota cl&aacute;sica y los de osteoartritis. Hay disminuci&oacute;n del espacio articular (solo presente en etapas muy avanzadas de la gota cl&aacute;sica), formaci&oacute;n de osteofitos marginales acompa&ntilde;ados de esclerosis subcondral. En el 80% de los casos se encuentra la presencia de tofos, erosiones marginales con bordes escler&oacute;ticos y sobrecrecimiento en sus l&iacute;mites (Signo de Martel) y la ausencia de osteopenia yuxtaarticular<sup>26</sup>.</p>      <p>Un diagn&oacute;stico definitivo de gota se realiza con la demostraci&oacute;n de cristales de urato monos&oacute;dico en el l&iacute;quido articular, en los derrames de las bursas o luego de la aspiraci&oacute;n de un tofo mediante un microscopio de luz polarizada donde se observan en forma de aguja birrefringentes negativos<sup>27-29</sup>. No es necesario pedir cultivos bacterianos de rutina a menos que exista una fuerte sospecha de infecci&oacute;n sobreagregada. En ocasiones la punci&oacute;n articular resulta dif&iacute;cil por poco l&iacute;quido o la falta de experiencia del examinador; en tales casos un cuadro cl&iacute;nico caracter&iacute;stico sumado a la presencia de hiperuricemia (&aacute;cido &uacute;rico &gt; 7 mgr/dl en el hombre y &gt; 6 en la mujer) confirma el diagn&oacute;stico de gota del adulto mayor<sup>30</sup>.</p>      <p>Sin embargo es importante aclarar que no toda hiperuricemia es sin&oacute;nimo de gota y que muchos individuos pueden nunca desarrollar una gota y que no en todas las crisis agudas hay elevaci&oacute;n del &aacute;cido &uacute;rico<sup>31</sup>. Dentro de las causas de no incrementarse en la uricemia se encuentra el consumo excesivo de alcohol, supresi&oacute;n de diur&eacute;tico o terapia con ASA, uso de nutrici&oacute;n parenteral, durante la terapia inicial con alopurinol o uricos&uacute;ricos, empleo de medios de contraste yodados para angiograf&iacute;as o tomograf&iacute;as<sup>32,33</sup>.</p>      <p>El diagn&oacute;stico diferencial m&aacute;s importante es con la artritis reumatoide del anciano. El cuadro poliarticular asim&eacute;trico con crisis en algunas articulaciones, los hallazgos radiol&oacute;gicos caracter&iacute;sticos, la presencia de hiperuricemia con t&iacute;tulos de factor reumatoide negativo o positivo a t&iacute;tulos bajos orientan el diagn&oacute;stico hacia gota del anciano. En vista que la gota puede aparecer en n&oacute;dulos de Heberden la aspiraci&oacute;n con aguja 29 de peque&ntilde;as articulaciones<sup>34</sup> sugiere la concomitancia de ambas enfermedades.</p>       <p><b>Tratamiento</b></p>      <p><b>Principios de tratamiento</b></p>       <p>El anciano es especialmente susceptible a presentar un incremento en los efectos colaterales y en la toxicidad renal y hep&aacute;tica debido al consumo de m&uacute;ltiples medicamentos y a la gran comorbilidad. Por lo tanto se debe sopesar la relaci&oacute;n riesgo-beneficio con el fin de seleccionar el medicamento con menores efectos delet&eacute;reos. Se han establecido tres pilares b&aacute;sicos del tratamiento del paciente con gota<sup>35</sup>. El primero es que el dep&oacute;sito de cristales de urato monos&oacute;dico es reversible as&iacute; que el prop&oacute;sito principal del tratamiento es eliminar los cristales de urato disminuyendo la hiperuricemia. La segunda medida es el control de la inflamaci&oacute;n articular y la tercera es evitar crisis inflamatorias articulares con medicamentos profil&aacute;cticos. El manejo &oacute;ptimo de la gota en el paciente adulto mayor debe incluir medidas no farmacol&oacute;gicas y farmacol&oacute;gicas. Dentro del primer grupo est&aacute;n recomendadas todas aquellas dirigidas a disminuir los factores de riesgo; control de la obesidad si la hubiere, disminuci&oacute;n del consumo de alcohol especialmente cerveza<sup>36</sup>.</p>      <p>El tratamiento farmacol&oacute;gico est&aacute; encaminado a abortar la crisis aguda como tambi&eacute;n a evitar las reca&iacute;das y las complicaciones (<a href="#tab3">Tabla 3</a>).</p>      <p><a name="tab3"></a><img src="img/revistas/rcre/v15n1/v15n1a02t3.gif"></p>       ]]></body>
<body><![CDATA[<p><b>Crisis aguda</b></p>      <p>Aunque la aplicaci&oacute;n de hielo se ha utilizado para terminar las crisis<sup>37,38</sup>, se prefiere la terapia farmacol&oacute;gica. Lo primero a considerar es el tiempo de iniciaci&oacute;n de la terapia y luego la elecci&oacute;n del medicamento<sup>39</sup>. Entre m&aacute;s r&aacute;pido se inicie el tratamiento mejor ser&aacute; la respuesta a la medicaci&oacute;n<sup>40</sup>. Esto es de vital importancia en el anciano que est&aacute; expuesto a m&uacute;ltiples medicaciones con potenciales interacciones ya que acortar&iacute;a el tratamiento de crisis. Dentro de los medicamentos empleados para suprimir la inflamaci&oacute;n en la etapa aguda se encuentra la colchicina, los antiinflamatorios no esteroides, los corticosteroides y la ACTH. Generalmente se prefiere iniciar con colchicina si existe duda diagn&oacute;stica ya que otras entidades comunes en este grupo etario como la enfermedad por dep&oacute;sito de pirofosfato tambi&eacute;n responden a colchicina y se reservan los AINES cuando el diagn&oacute;stico es seguro. Durante este tiempo no deben iniciarse o suspenderse medicamentos que alteren los niveles s&eacute;ricos de &aacute;cido &uacute;rico como alopurinol, asa o diur&eacute;ticos, los cuales podr&iacute;an precipitar el &aacute;cido &uacute;rico en la articulaci&oacute;n y ocasionar una nueva crisis. El tratamiento de la fase aguda debe sostenerse por dos a tres semanas de la resoluci&oacute;n de la inflamaci&oacute;n, momento en el cual se iniciar&aacute; el tratamiento profil&aacute;ctico.</p>       <p>La colchicina fue el primer medicamento en emplearse. Inicialmente se utiliz&oacute; en dosis orales de 0,5 mg cada hora hasta la aparici&oacute;n de s&iacute;ntomas gastrointestinales como v&oacute;mito, dolor abdominal o diarrea, alcanzar la dosis m&aacute;xima de 5 mg en las primeras 24 horas o la resoluci&oacute;n de la crisis; sin embargo, en ancianos la tasa de eventos adversos fue del 50-80%<sup>41</sup>. EULAR recomienda usar en la crisis aguda dosis promedio de 0,5 mg tres veces al d&iacute;a, alcanzando buena respuesta pero es pobremente tolerada en este grupo poblacional. El uso intravenoso no se recomienda porque en algunos casos ha conducido a muerte<sup>42,43</sup>. Es importante recordar que su efecto principal es antiinflamatorio, impidiendo la migraci&oacute;n y activaci&oacute;n del neutr&oacute;filo, pero no tiene efecto en la uricemia y por lo tanto se requerir&aacute; adicionalmente un medicamento profil&aacute;ctico una vez el paciente salga de la crisis. Otro efecto colateral es la neuromiopat&iacute;a axonal dolorosa potencialmente reversible, principalmente cuando se combina colchicina con ciclosporina, diur&eacute;ticos y estatinas<sup>44-48</sup>. Debe usarse con precauci&oacute;n en los pacientes con enfermedad hep&aacute;tica, falla cardiaca y deterioro de la funci&oacute;n renal previa.</p>      <p>Los antiinflamatorios no esteroideos (AINES) son preferibles a la colchicina<sup>49-53</sup>, debido a que son mejor tolerados y su perfil terap&eacute;utico es m&aacute;s predecible, son igualmente efectivos en el tratamiento agudo incluso comparables con los inhibidores COX-2<sup>54-56</sup>; prefiri&eacute;ndose los de vida media corta en ancianos como ibuprof&eacute;n y diclofenac. En el adulto se recomienda usar la dosis m&aacute;xima para el r&aacute;pida resoluci&oacute;n de la crisis; sin embargo, en el anciano podr&iacute;a incrementar el riesgo de sangrado gastrointestinal, falla renal aguda, por lo tanto se recomiendan dosis menores acompa&ntilde;adas siempre con inhibidores de la bomba de protones. No se deben utilizar en casos de falla renal, falla cardiaca, trastorno hep&aacute;tico importante, discrasias sangu&iacute;neas o &uacute;lcera gastrointestinal. La ventaja de usar inhibidores COX-2 ser&iacute;a que no alteran la funci&oacute;n plaquetaria en ancianos que est&aacute;n recibiendo asa en dosis bajas como protector card&iacute;aco pero algunos estudios han sugerido aumento en la mortalidad coronaria; la evidencia actual es d&eacute;bil<sup>57-59</sup>.</p>      <p>Los corticosteroides son medicamentos altamente efectivos en controlar la inflamaci&oacute;n en enfermedad articular, no siendo la excepci&oacute;n la gota<sup>60,61</sup>, la dosis no est&aacute; claramente establecida pero se ha utilizado prednisona en dosis variables desde 20 hasta 60 mg al d&iacute;a con desmonte en 10 d&iacute;as. Los efectos colaterales cuando son usados por periodos de tiempo cortos son raros. Son una buena alternativa en la crisis aguda de gota poliarticular en el anciano, falta de respuesta o intolerancia a colchicina o AINES, cuando existe deterioro de la funci&oacute;n renal, &uacute;lcera p&eacute;ptica activa<sup>62,63</sup>. Las formas parenterales tambi&eacute;n se han empleado principalmente en aquellos enfermos que no toleran medicaci&oacute;n alguna por la boca. Se reserva la infiltraci&oacute;n con triamcinolona acetonide en caso de monoartritis<sup>52,64,65</sup>. Las contraindicaciones de la infiltraci&oacute;n son la no aceptaci&oacute;n del procedimiento, infecci&oacute;n articular y el consumo de anticoagulantes.</p>      <p><b>Tratamiento profil&aacute;ctico</b></p>      <p>La meta es disminuir los niveles de &aacute;cido &uacute;rico a 6 mg/dl o menos que basado en el nivel de saturaci&oacute;n de los l&iacute;quidos extracelulares con urato monos&oacute;dico, es de 6,8 mg/dl<sup>66,67</sup>. Hoskison y Wortmann recomiendan mantener niveles de &aacute;cido &uacute;rico menores de 5 mg/dl por lo cual pudiera ser riesgoso ya que se requerir&iacute;an mayores dosis para llegar a este nivel y aumentar las reacciones adversas<sup>68</sup>. En general a niveles de &aacute;cido &uacute;rico m&aacute;s bajos m&aacute;s r&aacute;pida ser&aacute; la resoluci&oacute;n de los tofos<sup>69</sup>. Como regla, una vez se inicia medicaci&oacute;n para disminuir el &aacute;cido &uacute;rico, esta es de por vida. La hiperuricemia es un factor independiente de riesgo cardiovascular en sujetos de alto riesgo, no as&iacute; en los sanos<sup>70</sup>; por lo tanto la hipeuricemia asintom&aacute;tica no requiere tratamiento<sup>71,72</sup>. La uricemia puede disminuirse con medicamentos inhibidores de la xantina oxidasa como el alopurinol, oxypurinol o febuxostat o con medicamentos que aumentan la excreci&oacute;n del mismo como probenecid, benzbromarona y sulfinpirazona.</p>      <p>El alopurinol es el medicamento m&aacute;s usado y efectivo en disminuir las concentraciones de &aacute;cido &uacute;rico independiente de su causa. Es r&aacute;pidamente metabolizado a oxypurinol, el cual es responsable de la mayor inhibici&oacute;n de la xantina oxidasa, bloqueando as&iacute; la conversi&oacute;n de hipoxantina en xantina y de xantina en &aacute;cido &uacute;rico. La vida media del oxypurinol es de 18-30 horas y se puede incrementar hasta una semana en falla renal terminal<sup>73</sup>. Se recomienda utilizarlo en dosis entre 100 y 800 mg al d&iacute;a, siendo la m&aacute;s frecuente de 300 mg al d&iacute;a; sin embargo, en ancianos con deterioro de la funci&oacute;n renal se inicia con 50 a 100 mg al d&iacute;a o basado en la tabla de titulaci&oacute;n propuesta por Hande<sup>74</sup>. Algunos cr&iacute;ticos no recomiendan su uso ya que no alcanzan las metas de reducci&oacute;n del &aacute;cido &uacute;rico<sup>75</sup>. Se ha utilizado en pacientes sobreproductores (&gt; 800 mg al d&iacute;a de &aacute;cido &uacute;rico en orina) pero tambi&eacute;n en aquellos subproductores, los cuales representan el 90% de todos los enfermos, con buenos resultados cl&iacute;nicos. El 20% de los pacientes presentan reacciones adversas y 5% son mandatarios de suspensi&oacute;n del medicamento<sup>39</sup>. El efecto colateral m&aacute;s temido aunque raro es el s&iacute;ndrome de hipersensibilidad manifestado por fiebre, rash, eosinofilia, leucocitosis, hepatitis, falla renal y hasta muerte. Se ha notado principalmente en ancianos y pacientes con falla renal que no tuvieron ajuste de la dosis<sup>76</sup>. En la <a href="#tab4">Tabla 4</a> se muestran las indicaciones de alopurinol.</p>      <p><a name="tab4"></a><img src="img/revistas/rcre/v15n1/v15n1a02t4.gif"></p>      <p>El febuxostat es un inhibidor selectivo no pur&iacute;nico de las dos formas: oxidada y reducida de la xantina oxidasa<sup>77</sup>. Tambi&eacute;n tiene metabolismo hep&aacute;tico pero no requiere ajuste de la dosis en falla renal<sup>78</sup>. Se ha usado en dosis de 80-120 mg al d&iacute;a con eficacia superior a alopurinol 300 mg al d&iacute;a<sup>79</sup>. Los efectos colaterales m&aacute;s frecuentes son diarrea, angioedema localizado, incremento en las cifras de creatinina y transaminasas. Faltan estudios a largo plazo que demuestren la seguridad del medicamento, pero surge como una opci&oacute;n promisoria en aquellos pacientes intolerantes al alopurinol o con falla renal bastante frecuente en la poblaci&oacute;n anciana.</p>       ]]></body>
<body><![CDATA[<p>El probenecid y la sulfinpyrazona son los uricos&uacute;ricos m&aacute;s utilizados en Estados Unidos, mientras que la benzbromarona es empleada en algunos pa&iacute;ses de Europa. La dosis de probenecid oscila entre 500 mg y 3 g repartida en dos o tres dosis y la sulfinpyrazona entre 300 y 400 mg al d&iacute;a dividida en tres o cuatro veces al d&iacute;a, lo que dificultar&iacute;a la adherencia del anciano a estos medicamentos. La benzbromarona es el m&aacute;s potente uricos&uacute;rico y puede utilizarse en falla renal moderada pero ha sido asociado a toxicidad hep&aacute;tica severa<sup>80</sup>. Las dosis recomendadas son de 50-125 mg al d&iacute;a. Los uricos&uacute;ricos se utilizan en pacientes subexcretores pero pueden precipitar la formaci&oacute;n de c&aacute;lculos; por lo tanto se recomienda su uso con consumo de l&iacute;quidos entre 1 y 1,5 litros al d&iacute;a, lo cual pudiera ser una desventaja potencial en pacientes con ICC o IRC; adicionalmente se recomienda mantener la orina alcalina (Ph: 6,4-6,8). En la <a href="#tab5">Tabla 5</a> se muestran los candidatos a terapia con uricos&uacute;ricos. Otra desventaja es que no deben ser usados simult&aacute;neamente con ASA en dosis mayores de 81 mg al d&iacute;a<sup>81</sup>, f&aacute;rmaco com&uacute;nmente formulado en prevenci&oacute;n primaria y secundaria de enfermedad cardiovascular. Rash, quejas gastrointestinales son poco frecuentes.</p>      <p><a name="tab5"></a><img src="img/revistas/rcre/v15n1/v15n1a02t5.gif"></p>      <p>Otros medicamentos tienen acci&oacute;n hipouricos&eacute;mica como el losart&aacute;n y el fenofibrato a trav&eacute;s de incrementar la depuraci&oacute;n renal de urato<sup>82-84</sup> y pueden ser usados como terapia coadyuvante.</p>       <p>La uricasa u oxidasa de urato es una enzima ausente en los humanos que cataliza la conversi&oacute;n de &aacute;cido &uacute;rico a alantoina, la cual es m&aacute;s soluble y de f&aacute;cil eliminaci&oacute;n renal<sup>75</sup>. La rasburicasa es la forma recombinante de la uricasa obtenida del Aspergillus flavus85, aprobada por la FDA para el manejo del s&iacute;ndrome de lisis tumoral. Disminuye r&aacute;pidamente el &aacute;cido &uacute;rico s&eacute;rico y reabsorbe los tofos en tres meses<sup>86</sup>. Debido a la corta vida media (18 horas ) se requiere infusiones frecuentes lo que lleva a la producci&oacute;n de anticuerpos y anafilaxia <sup>87,88</sup>. La forma pegilada tiene una vida media mayor con menos antigenicidad<sup>89</sup>. No requiere ajustes en la dosis en falla renal o hep&aacute;tica pero no se puede usar con alopurinol porque limita su eficacia<sup>90</sup>. Est&aacute; contraindicada en sujetos con deficiencia de glucosa 6 fosfato deshidrogenasa ya que son deficitarios en sistemas antioxidantes y no depurar&iacute;an el per&oacute;xido de hidr&oacute;geno generado91. Se ha utilizado diariamente por menos de dos semanas para luego continuar con inhibidores de la xantina oxidasa. Se requieren m&aacute;s estudios para determinar su papel en el tratamiento de la gota del adulto mayor.</p>      <p><b>Conclusiones</b></p>       <p>La gota del anciano es la artritis m&aacute;s frecuente en este grupo etario. El reconocimiento es importante porque difiere de las manifestaciones cl&iacute;nicas del adulto y el correcto diagn&oacute;stico es primordial porque es un tipo de artritis potencialmente reversible. Las caracter&iacute;sticas especiales del adulto mayor como la fragilidad, comorbilidad, polifarmacia, hacen que el manejo difiera del tratamiento de la gota convencional.</p>      <p><b>Referencias</b></p>      <!-- ref --><p>1. Saag KG, Choi H. Epidemiology, risk factors, and lifestyle modifications for gout &#91;abstract&#93;. Arthritis Res Ther 2006; 8 Suppl. 1: S2.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000050&pid=S0121-8123200800010000200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><br> 20080700  2. Arromdee E, Michet C, Crowson C, O’Fallon M, Gabriel S. 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