<?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>0121-5256</journal-id>
<journal-title><![CDATA[Revista Med]]></journal-title>
<abbrev-journal-title><![CDATA[rev.fac.med]]></abbrev-journal-title>
<issn>0121-5256</issn>
<publisher>
<publisher-name><![CDATA[Universidad Militar Nueva Granada. Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-52562010000100010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[MIOPATÍA POR CUERPOS DE INCLUSIÓN: CASO CLÍNICO Y REVISIÓN DE LA LITERATURA]]></article-title>
<article-title xml:lang="en"><![CDATA[INCLUSION BODY MYOPATHY: CASE REPORT AND LITERATURE REVIEW]]></article-title>
<article-title xml:lang="pt"><![CDATA[MIOPATIA POR CORPOS DE INCLUSÃO: RELATO DE CASO E REVISÃO DA LITERATURA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GUZMÁN V.]]></surname>
<given-names><![CDATA[CLAUDIA M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[CUBIDES]]></surname>
<given-names><![CDATA[MARÍA F.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[REYES S.]]></surname>
<given-names><![CDATA[ELSA]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[LONDOÑO]]></surname>
<given-names><![CDATA[JOHN]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SANTOS]]></surname>
<given-names><![CDATA[PEDRO]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BAUTISTA]]></surname>
<given-names><![CDATA[WILSON]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SALAZAR]]></surname>
<given-names><![CDATA[ROSA]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[VARELA]]></surname>
<given-names><![CDATA[PAOLA]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[VALLE O.]]></surname>
<given-names><![CDATA[RAFAEL]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Militar Nueva Granada, Bogotá Programa de Reumatología ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de la Sabana Residente del Programa de Reumatología ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Militar Central Servicio de Reumatología ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2010</year>
</pub-date>
<volume>18</volume>
<numero>1</numero>
<fpage>93</fpage>
<lpage>99</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-52562010000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-52562010000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-52562010000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La miositis por cuerpos de inclusión (MCI) es una patología poco común que se presenta en individuos mayores de 50 años y con mayor frecuencia en hombres; sin embargo, los síntomas pueden empezar 20 años antes de su diagnóstico. Hasta un 30% de los casos de miopatías inflamatorias pueden ser de MCI y su prevalencia varía en los diferentes países y grupos étnicos. Clínicamente se manifiesta como debilidad lentamente progresiva proximal y distal. En este artículo se presenta un caso de una paciente de 78 años con antecedentes previos de diabetes mellitus tipo 2, hipertensión arterial, e hipotiroidismo, con cuadro de 18 meses de evolución consistente en debilidad de miembros inferiores, incapacidad para subir y bajar escaleras, limitación en la marcha, acompañado de disestesias. Se realizó la medición de la creatin quinasa (CK) y su valor inicial fue 7820, la electromiografía y neuroconducciones mostraron polineuropatia axonal motora en las cuatro extremidades y miopatía inflamatoria. Se trató con glucorticoides a dosis de 1 mg/kg y después de seis meses de tratamiento no se observó mejoría. Se decide tomar biopsia muscular que mostró miopatía por cuerpos de inclusión, lo que explicó la falla terapéutica inicial. Este caso es interesante desde el punto de vista clínico, ya que no es frecuente la elevación de la CK en los niveles que presentó la paciente y por las múltiples comorbilidades asociadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Inclusion body myositis (IBM) is an infrequent disease in people over 50 years of age, affecting more frequently males; however the symptoms may begin 20 years before its diagnosis. Up to 30% of all inflammatory myopathies can be IBM and its prevalence varies among different countries and ethnical groups. IBM manifest clinically by slowly progressive proximal and distal weakness. In this article a report of case is presented: A female patient 78 years old with previous history of type 2 diabetes mellitus, hypertension and hypothyroidism; with 18 months history of weakness in lower limbs, inability to climb stairs, limited to walk, associated with dysesthesias. The initial CK was 7820 mg/dl, the electromyography and nerve conductions reported a motor axonal polyneuropathy of four limbs and inflammatory myopathy. She was treated with steroids at doses of 1mg/kg without improvement, after 6 months of treatment. It was decided to take a muscle biopsy that showed an inclusion body myopathy, explaining the initial treatment failure. This case is interesting from a clinical point of view, since it is not frequent elevated CK levels as it was presented by the patient and for the numerous associated co-morbidities.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A miosite por corpo de inclusão (MCI) é uma doença rara que apresenta-se em indivíduos acima de 50 anos, atingindo 30% das miopatias inflamatória; orém os sintomas podem começar 20 anos antes. Sua prevalência varia entre países e grupos étnicos. Clínicamente manifesta-se como uma fraqueza lentamente progressiva proximal e distal mais frecuentemente nos homens. Nós relatamos um caso de uma paciente de 78 anos com antecedentes de diabetes mellitus tipo 2, hipertensão e hipotireoidismo. Com quadro clínico de 18 meses de evolução consistindo em fraqueza nos membros inferiores, incapacidade de subir escadas, a limitação para a marcha, acompanhados de disestesias. Foi feito a prova de CK dando um valor inicial de 7820 e com eletromiografia e neurocondução que informaram polineuropatia axonal motora de quatro membros e miopatia inflamatória. Foi tratado com corticóides em doses de 1 mg / kg sem melhora após 6 meses de tratamento, razão pela qual foi decidido fazer uma biópsia do músculo que mostrou miopatía do corpo de inclusão, explicando a falha do tratamento inicial. Este caso é interessante do ponto de vista clínico, uma vez que não é frequente a elevação da CK nos niveis apresentados pela paciente e pelas múltiplas comorbidades associadas.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[miositis]]></kwd>
<kwd lng="es"><![CDATA[miopatía]]></kwd>
<kwd lng="es"><![CDATA[cuerpos de inclusión]]></kwd>
<kwd lng="en"><![CDATA[myositis]]></kwd>
<kwd lng="en"><![CDATA[myopathy]]></kwd>
<kwd lng="en"><![CDATA[inclusion bodies]]></kwd>
<kwd lng="pt"><![CDATA[miosite]]></kwd>
<kwd lng="pt"><![CDATA[doenças musculares]]></kwd>
<kwd lng="pt"><![CDATA[corpos de inclusão]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2"> </font>     <p align="right"><font size="2" face="verdana"><b>PR&Aacute;CTICA CL&Iacute;NICA </b></font></p> <font face="verdana" size="2">    <p align="center"><font face="verdana" size="4"><b>MIOPAT&Iacute;A POR CUERPOS DE INCLUSI&Oacute;N. CASO CL&Iacute;NICO Y REVISI&Oacute;N DE LA LITERATURA</b></font></p>     <p align="center"><font face="verdana" size="3"><b>INCLUSION BODY MYOPATHY. CASE REPORT AND LITERATURE REVIEW</b></font></p>     <p align="center"><font face="verdana" size="3"><b>MIOPATIA POR CORPOS DE INCLUS&Atilde;O. RELATO DE CASO E REVIS&Atilde;O DA LITERATURA</b></font></p>     <p align="center">CLAUDIA M. GUZM&Aacute;N V., MD.<sup><b>a</b></sup>*,MAR&Iacute;A F. CUBIDES, MD.<sup><b>b</b></sup>, ELSA REYES S. MD.<sup><b>c</b></sup>, JOHN LONDO&Ntilde;O, MD.<sup><b>c</b></sup>, PEDRO SANTOS, MD.<sup><b>c</b></sup>, WILSON BAUTISTA, MD.<sup><b>a</b></sup>, ROSA SALAZAR, MD.<sup><b>b</b></sup>, PAOLA VARELA, MD.<sup><b>b</b></sup> Y  RAFAEL VALLE O. MD.<sup><b>c</b></sup></p>  </font>    <p><font size="2" face="verdana"><sup><b>a</b></sup> Residente del Programa de Reumatolog&iacute;a, Universidad Militar Nueva Granada, Bogot&aacute;.    <br>   <sup><b>b</b></sup> Residente del Programa de Reumatolog&iacute;a, Universidad de la Sabana, Bogot&aacute;.     <br><sup><b>c</b></sup> Reumat&oacute;logo, Servicio de Reumatolog&iacute;a Hospital Militar Central, Bogot&aacute;, Colombia, Universidad Militar Nueva Granada y Universidad de la Sabana.</font></p>  <font face="verdana" size="2">    <p>* Correspondencia: Claudia Guzm&aacute;n <a href="cm_guzman75@hotmail.com"/a>cm_guzman75@hotmail.com</a>. Direcci&oacute;n postal: Tr. 3 #49-00. Servicio de Reumatolog&iacute;a, Hospital Militar Central, Bogot&aacute; Colombia.</p>  <hr>      ]]></body>
<body><![CDATA[<br> Recibido: Abril 5 de 2010. Aceptado: Mayo 26 de 2010.      <p><b>Resumen</b></p>     <p>La miositis por cuerpos de inclusi&oacute;n (MCI) es una patolog&iacute;a poco com&uacute;n que se presenta en individuos mayores de 50 a&ntilde;os y con mayor frecuencia en hombres; sin embargo, los s&iacute;ntomas pueden empezar 20 a&ntilde;os antes de su diagn&oacute;stico. Hasta un 30% de los casos de miopat&iacute;as inflamatorias pueden ser de MCI y su prevalencia var&iacute;a en los diferentes pa&iacute;ses y grupos &eacute;tnicos. Cl&iacute;nicamente se manifiesta como debilidad lentamente progresiva proximal y distal. En este art&iacute;culo se presenta un caso de una paciente de 78 a&ntilde;os con antecedentes previos de diabetes mellitus tipo 2, hipertensi&oacute;n arterial, e hipotiroidismo, con cuadro de 18 meses de evoluci&oacute;n consistente en debilidad de miembros inferiores, incapacidad para subir y bajar escaleras, limitaci&oacute;n en la marcha, acompa&ntilde;ado de disestesias. Se realiz&oacute; la medici&oacute;n de la creatin quinasa (CK) y su valor inicial fue 7820, la electromiograf&iacute;a y neuroconducciones mostraron polineuropatia axonal motora en las cuatro extremidades y miopat&iacute;a inflamatoria. Se trat&oacute; con glucorticoides a dosis de 1 mg/kg y despu&eacute;s de seis meses de tratamiento no se observ&oacute; mejor&iacute;a. Se decide tomar biopsia muscular que mostr&oacute; miopat&iacute;a por cuerpos de inclusi&oacute;n, lo que explic&oacute; la falla terap&eacute;utica inicial. Este caso es interesante desde el punto de vista cl&iacute;nico, ya que no es frecuente la elevaci&oacute;n de la CK en los niveles que present&oacute; la paciente y por las m&uacute;ltiples comorbilidades asociadas.</p>     <p><b>Palabras clave</b>: miositis, miopat&iacute;a, cuerpos de inclusi&oacute;n</p>  <hr>      <p><b>Abstract</b></p>     <p>Inclusion body myositis (IBM) is an infrequent disease in people over 50 years of age, affecting more frequently males; however the symptoms may begin 20 years before its diagnosis. Up to 30% of all inflammatory myopathies can be IBM and its prevalence varies among different countries and ethnical groups. IBM manifest clinically by slowly progressive proximal and distal weakness. In this article a report of case is presented: A female patient 78 years old with previous history of type 2 diabetes mellitus, hypertension and hypothyroidism; with 18 months history of weakness in lower limbs, inability to climb stairs, limited to walk, associated with dysesthesias. The initial CK was 7820 mg/dl, the electromyography and nerve conductions reported a motor axonal polyneuropathy of four limbs and inflammatory myopathy. She was treated with steroids at doses of 1mg/kg without improvement, after 6 months of treatment. It was decided to take a muscle biopsy that showed an inclusion body myopathy, explaining the initial treatment failure. This case is interesting from a clinical point of view, since it is not frequent elevated CK levels as it was presented by the patient and for the numerous associated co-morbidities.</p>     <p><b>Key words</b>: myositis, myopathy, inclusion bodies</p>  <hr>      <p><b>Resumo</b></p>     <p>A miosite por corpo de inclus&atilde;o (MCI) &eacute; uma doen&ccedil;a rara que apresenta-se em indiv&iacute;duos acima de 50 anos, atingindo 30% das miopatias inflamat&oacute;ria; or&eacute;m os sintomas podem come&ccedil;ar 20 anos antes. Sua preval&ecirc;ncia varia entre pa&iacute;ses e grupos &eacute;tnicos. Cl&iacute;nicamente manifesta-se como uma fraqueza lentamente progressiva proximal e distal mais frecuentemente nos homens. N&oacute;s relatamos um caso de uma paciente de 78 anos com antecedentes de diabetes mellitus tipo 2, hipertens&atilde;o e hipotireoidismo. Com quadro cl&iacute;nico de 18 meses de evolu&ccedil;&atilde;o consistindo em fraqueza nos membros inferiores, incapacidade de subir escadas, a limita&ccedil;&atilde;o para a marcha, acompanhados de disestesias. Foi feito a prova de CK dando um valor inicial de 7820 e com eletromiografia e neurocondu&ccedil;&atilde;o que informaram polineuropatia axonal motora de quatro membros e miopatia inflamat&oacute;ria. Foi tratado com cortic&oacute;ides em doses de 1 mg / kg sem melhora ap&oacute;s 6 meses de tratamento, raz&atilde;o pela qual foi decidido fazer uma bi&oacute;psia do m&uacute;sculo que mostrou miopat&iacute;a do corpo de inclus&atilde;o, explicando a falha do tratamento inicial. Este caso &eacute; interessante do ponto de vista cl&iacute;nico, uma vez que n&atilde;o &eacute; frequente a eleva&ccedil;&atilde;o da CK nos niveis apresentados pela paciente e pelas m&uacute;ltiplas comorbidades associadas.</p>     <p><b>Palavras-chave</b>: miosite, doen&ccedil;as musculares, corpos de inclus&atilde;o</p>  <hr>     ]]></body>
<body><![CDATA[<p><b>Introducci&oacute;n</b></p>     <p>La miopat&iacute;a por cuerpos de inclusi&oacute;n (MCI) es una patolog&iacute;a que se presenta en individuos mayores de 50 a&ntilde;os y con mayor frecuencia en hombres y junto con la polimiositis, la dermatomiositis y la miopat&iacute;a necrotizante conforman las miopat&iacute;as idiop&aacute;ticas inflamatorias mediadas en forma inmune (1-4); sin embargo, son cl&iacute;nica e histol&oacute;gicamente diferentes (3,5). El primer caso de MCI fue descrito por Chou en 1967 en un hombre de 66 a&ntilde;os con un diagn&oacute;stico de polimiositis cr&oacute;nica, pero en la biopsia muscular se pudo observar las inclusiones citoplasm&aacute;ticas y fibras musculares con vacuolas (6); el t&eacute;rmino MCI fue introducido en 1971 por Yunis y Samaha (7) y luego en 1991 Mendell y col. utilizaron la tinci&oacute;n de Rojo Congo e identifican por primera vez la presencia de amiloide en las fibras musculares (8). Debido a que el tratamiento de la MCI es distinto al de las otras miopat&iacute;as, su diagn&oacute;stico diferencial es muy importante (9). En Colombia son pocos los casos reportados, solo encontramos cinco en el Valle del Cauca en pacientes menores de 40 a&ntilde;os (10).</p>     <p><b>Reporte del caso</b></p>     <p>Paciente femenina de 78 a&ntilde;os de edad, enfermera pensionada procedente de Bogot&aacute;, con antecedente de diabetes mellitus tipo 2, hipertensi&oacute;n arterial, hipotiroidismo, asma en tratamiento desde hace cinco a&ntilde;os. Consulta por cuadro de 18 meses de evoluci&oacute;n consistente en debilidad muscular de predominio en miembros inferiores, asociado a dificultad para subir y bajar escaleras, limitaci&oacute;n en la marcha y disestesias. Inicialmente es valorada por el servicio de neurolog&iacute;a que la reporta como paciente con p&eacute;rdida importante de la fuerza, debilidad muscular para cambios de posici&oacute;n sentada y bipedestaci&oacute;n. Marcha ligeramente par&eacute;tica, reflejos osteotendinosos normales, con niveles de CPK de 7819, por lo cual se decide hospitalizarla para estudio de miopat&iacute;a. </p>     <p>Durante la hospitalizaci&oacute;n se realizaron: 1- estudios inmunol&oacute;gicos tales como la medici&oacute;n de anticuerpos antinucleares (ANAS) report&aacute;ndose un valor de 1/320 con patr&oacute;n moteado fino y de anticuerpos extractables del n&uacute;cleo (ENAS) que fueron reportados como negativos; 2- estudios para neoplasias como la tomograf&iacute;a axial computada toracoabdominal que mostr&oacute; colelitiasis y miomatosis uterina calcificada; 3- neuroconducci&oacute;n y electromiograf&iacute;a de las cuatro extremidades en donde se muestra polineuropat&iacute;a axonal motora en las cuatro extremidades y presencia de miopat&iacute;a inflamatoria. Despu&eacute;s de descartar procesos neopl&aacute;sicos, infecciosos y problemas por medicamentos, se diagnostica una miopat&iacute;a inflamatoria y se inicia el tratamiento con prednisona 1 mg /kg/d&iacute;a, observ&aacute;ndose una mejor&iacute;a parcial de la sintomatolog&iacute;a.</p>     <p>Seis meses despu&eacute;s se observa que persiste la debilidad en miembros inferiores hasta el punto de incapacitarla para caminar. Se remite al servicio de reumatolog&iacute;a, donde se decide ampliar los estudios inmunol&oacute;gicos, se miden los niveles de anticuerpos anti- m&uacute;sculo liso, anti-mitocondriales, anti-JO y de crioglobulinas; se hacen estudios para vasculitis (ANCAS), se ordena una electroforesis de prote&iacute;nas y todos los resultados son negativos. Otros ex&aacute;menes realizados y sus resultados fueron: ANAS 1/160 con patr&oacute;n moteado fino, ENAS negativo, anticuerpos anti–DNA negativo. Teniendo en cuenta la edad de la paciente, la falta de respuesta al tratamiento y las coomorbilidades asociadas, se decide solicitar biopsia muscular (tablas <a href="#tab1">1</a> y <a href="#tab2">2</a>).</p>     <p>    <center><a name= "tab1"><img src="img/revistas/med/v18n1/v18n1a10t01.jpg"></a></center></p>     <p>    <center><a name= "tab2"><img src="img/revistas/med/v18n1/v18n1a10t02.jpg"></a></center></p>     ]]></body>
<body><![CDATA[<p>En el informe de la biopsia muscular, con la coloraci&oacute;n de eosina se observan vacuolas dentro de las fibras musculares y proceso inflamatorio intersticial y se concluye que el diagn&oacute;stico es miopat&iacute;a inflamatoria por cuerpos de inclusi&oacute;n (<a href="#fig1">Imagen 1</a>). La biopsia de nervio sural fue informada con vasculitis leve.</p>     <p>    <center><a name= "fig1"><img src="img/revistas/med/v18n1/v18n1a10f01.jpg"></a></center></p>     <p><b>Miopat&iacute;a por cuerpos de inclusi&oacute;n</b></p>     <p>La MCI es uno de los des&oacute;rdenes musculares adquiridos y su patog&eacute;nesis es desconocida; se considera que hay una interacci&oacute;n compleja entre la edad, la gen&eacute;tica y los factores ambientales. Las caracter&iacute;sticas patol&oacute;gicas son una triada &uacute;nica: cambios inflamatorios con invasi&oacute;n de linfocitos CD8+ que se expresan en las fibras musculares, con inclusiones citoplasm&aacute;ticas e intranucleares con contenido amiloide, que interact&uacute;an con des&oacute;rdenes miodegenerativos (11,12), los cuales se han visto asociados a trastornos inmunes e infecciosos y que son disparadores de la MCI (<a href="#tab3">tabla 3</a>). Desde el punto de vista de la epidemiolog&iacute;a se han descrito diferencias en su incidencia en los diferentes grupos &eacute;tnicos, siendo baja en los coreanos, afroamericanos y mestizo mesoamericano (13), media en la poblaci&oacute;n del este y sureste del Mediterr&aacute;neo y alta en el norte de Europa y en la poblaci&oacute;n blanca de Norteam&eacute;rica y Australia.</p>     <p>    <center><a name= "tab3"><img src="img/revistas/med/v18n1/v18n1a10t03.jpg"></a></center></p>     <p>Las manifestaciones cl&iacute;nicas se presentan usualmente despu&eacute;s de los 50 a&ntilde;os, pero el diagn&oacute;stico se realiza cinco a ocho a&ntilde;os despu&eacute;s del inicio de los s&iacute;ntomas que son insidiosos, con debilidad que se desarrolla en forma lenta y progresiva, generalmente inician de la parte proximal a la distal y afecta m&aacute;s a los hombres que a las mujeres (<a href="#tab4">tabla 4</a>) (31-33). En algunos casos se ve m&aacute;s comprometido el sensorio y la disfagia puede llegar a presentarse en el 40% de los casos, requiriendo miotom&iacute;a cricofar&iacute;ngea la cual es beneficiosa (34,35). La afecci&oacute;n del sensorio se examina cl&iacute;nicamente y con estudios electrofisiol&oacute;gicos y de neuroconducci&oacute;n, que evidencian la neuropat&iacute;a axonal sensorial e incremento de la actividad polif&aacute;sica motora (36,37). Los estudios de laboratorios pueden mostrar elevaci&oacute;n de la CK s&eacute;rica la cual puede estar normal o elevada hasta diez veces (38,39); los anticuerpos antinucleares pueden estar presentes en un 20% de los casos, pero usualmente est&aacute;n ausentes y un 20% de los pacientes pueden tener una gamapat&iacute;a monoclonal indeterminada. La resonancia magn&eacute;tica puede mostrar afectaci&oacute;n muscular focal, atrofia y definir los patrones de p&eacute;rdida de unidades motoras despu&eacute;s del traumatismo de nervios perif&eacute;ricos, por cual es importante para el diagn&oacute;stico cl&iacute;nico y seguimiento de respuesta al tratamiento (40-43). </p>     <p>    <center><a name= "tab4"><img src="img/revistas/med/v18n1/v18n1a10t04.jpg"></a></center></p>     ]]></body>
<body><![CDATA[<p>Para realizar el diagn&oacute;stico diferencial es importante tener en cuenta la cl&iacute;nica, los paracl&iacute;nicos y la histopatolog&iacute;a confirmada, para definir si es MIC o si estamos ante otra patolog&iacute;a (<a href="#tab5">tabla 5</a>). La expectativa de vida no se altera en la MCI, pero desafortunadamente es una enfermedad lentamente progresiva (44-46). </p>     <p>    <center><a name= "tab5"><img src="img/revistas/med/v18n1/v18n1a10t05.jpg"></a></center></p>     <p>En general MIC no responde a los inmunosupresores o inmunomoduladores y algunos pacientes terminan dependientes luego de diez a quince a&ntilde;os de iniciada la enfermedad. Se han realizado varios estudios para medir la eficacia de los corticoides, pero la respuesta no ha sido tan positiva como se esperaba; los resultados mostraron una disminuci&oacute;n de los niveles s&eacute;ricos de CK, pero sin cambios en la fuerza muscular ni en la histopatolog&iacute;a (47,48). Los estudios realizados con medicamentos citot&oacute;xicos como el metotrexate mostraron los mismos resultados (49). En los estudios en donde se utiliz&oacute; la inmunoglobulina humana, se observ&oacute; una diferencia significativa en la mejor&iacute;a de los s&iacute;ntomas neuromusculares, pero no en la fuerza muscular, ni una diferencia en los niveles de CK, pero se considera una buena alternativa con buen perfil de seguridad (50-52). Otros trabajos realizados en los que se utilizaron globulina anti-timocito o terapias basadas en citoquinas (interfer&oacute;n a, interfer&oacute;n &beta; 1a, etanercept, alentuzumab), los resultados no tuvieron impacto; adem&aacute;s se concluye que se requiere un nuevo estudio que incluya un mayor n&uacute;mero de pacientes y m&aacute;s tiempo de observaci&oacute;n para definir su eficacia y seguridad (53-56). </p>     <p>Los avances en la biotecnolog&iacute;a han promovido nuevos productos como los anticuerpos monoclonales o fusi&oacute;n de prote&iacute;nas para la inmunoterapia, que manipulan el sistema inmune por inhibici&oacute;n selectiva o depleci&oacute;n de c&eacute;lulas B o c&eacute;lulas T; se pueden citar el daclizumab, antagonista del receptor de IL-2; alentuzumab, anticuerpo monoclonal humanizado contra se&ntilde;alizaci&oacute;n de c&eacute;lulas T; fingomilod, agente anti-migraci&oacute;n de la c&eacute;lula T; eculizumab, anticuerpo monoclonal agonista del factor C5 del complemento y natalizumab, agente antimigraci&oacute;n de c&eacute;lulas T o B (57-62). Todos estos agentes se han utilizado con &eacute;xito en esclerosis m&uacute;ltiple, pero en las miopat&iacute;as inflamatorias s&oacute;lo se han hecho estudios piloto. Se recomienda que las terapias farmacol&oacute;gicas se deben asociar a otras terapias, que dependen de cada caso, como la miotom&iacute;a cricofar&iacute;ngea, la inyecci&oacute;n con toxina botul&iacute;nica en el esf&iacute;nter esof&aacute;gico, la terapia f&iacute;sica y ocupacional que son eficaces y seguras en el reacondicionamiento aer&oacute;bico del paciente, el uso de ortesis es beneficioso y son bien toleradas por los pacientes y la trasferencia de tendones en algunos pacientes que restaura la funci&oacute;n, sobre todo en los extensores de los dedos (63-69). Otras terapias emp&iacute;ricas como la oxalondrona, un andr&oacute;geno sint&eacute;tico, ha dado buen resultado sobre la fuerza muscular; la coenzima Q10, la carnitina, los agentes antioxidantes y el clerbuterol mejoran los s&iacute;ntomas de los pacientes. Se espera que estos nuevos productos sean mejorados para un adecuado aprovechamiento en la terap&eacute;utica de estos des&oacute;rdenes, que de alguna manera siguen siendo un reto para el m&eacute;dico en el manejo de estos pacientes (70).</p>     <p><b>Conclusi&oacute;n</b></p>     <p>La miopat&iacute;a por cuerpos de inclusi&oacute;n es una patolog&iacute;a que se debe reconocer tempranamente, ya que su diagn&oacute;stico y tratamiento difieren de otras miopat&iacute;as m&aacute;s frecuentes. Requiere de una integraci&oacute;n cl&iacute;nica, paracl&iacute;nica e histopatol&oacute;gica espec&iacute;fica, como se describe en el caso informado. 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