<?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>S0121-52562010000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[OSTEOPOROSIS ASOCIADA A GLUCOCORTICOIDES: UNA APROXIMACIÓN PRÁCTICA. REVISIÓN]]></article-title>
<article-title xml:lang="en"><![CDATA[OSTEOPOROSIS ASSOCIATED WITH GLUCOCORTICOIDS: A PRACTICAL APPROACH. A REVIEW]]></article-title>
<article-title xml:lang="pt"><![CDATA[OSTEOPOROSE ASSOCIADA COM GLICOCORTICÓIDES: UMA ABORDAGEM PRÁTICA. REVISÃO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[YURGAKY S]]></surname>
<given-names><![CDATA[JAMES MILTHON]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ARREDONDO G]]></surname>
<given-names><![CDATA[ANA MARÍA]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Programa de Endocrinología Universidad Militar Nueva Granada ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Programa de Medicina Interna Universidad Militar Nueva Granada ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<volume>18</volume>
<numero>2</numero>
<fpage>210</fpage>
<lpage>220</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-52562010000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-52562010000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-52562010000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La osteoporosis es una enfermedad de alta prevalencia en el mundo y una de las causas más importantes de su forma secundaria es el uso crónico de glucocorticoides; aproximadamente el 0,5% de la población mundial es consumidora crónica de estos medicamentos, dadas sus múltiples indicaciones en el tratamiento de enfermedades reumáticas, dermatológicas, pulmonares o renales entre otras. Los pacientes con osteoporosis inducida por glucocorticoides presentan complicaciones como la fractura de cadera, situación que genera altos costos a los sistemas de salud. Por lo tanto, es muy importante hacer un diagnóstico rápido para iniciar un tratamiento oportuno, debido a que la prevención y el tratamiento de la enfermedad son menos costosos que el manejo de sus complicaciones. Se consideran en riesgo de osteoporosis todos aquellos pacientes que toman 5 mg diarios de prednisolona o más, por un tiempo mínimo de tres meses; a estos pacientes se les debe realizar una densitometría ósea (DXA), que es el método diagnóstico de elección para todos los tipos de osteoporosis. Un T Score diagnóstico para osteoporosis u osteopenia indican el inicio de tratamiento específico principalmente con bifosfonatos, entre los cuales el risedronato y alendronato han demostrado mejor efectividad. Otra de las indicaciones para el tratamiento específico estaría basada en el riesgo de fractura definido por la OMS con el Score FRAX. Finalmente, la prevención se debe hacer en todo paciente usuario crónico de glucocorticoides con medidas generales que implican cambios en el estilo de vida y la ingesta diaria de 1000 a 1500 mg de calcio elemental y 600 u de vitamina D.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Osteoporosis is a highly prevalent disease in the world and one of the most important causes of its secondary form is the chronic use of glucocorticoids; approximately 0.5% of the world&rsquo;s population is chronic consumer of this medicine because of its many indications in the treatment of rheumatic, dermatologic, pulmonary or renal diseases among others. Patients with glucocorticoid induced osteoporosis generates high costs for health systems derived from its complications, such as hip fractures, being more cost-effective the prevention and treatment of the disease than the management of its complications, that constitutes an important reason for its early diagnose and treatment. Every patient who takes prednisolone 5 mg daily or more for a minimum of three months is considered at risk of glucocorticoid induced osteoporosis; these patients should be screened with DXA, which is the election diagnostic method for all types of osteoporosis. Diagnosis of osteoporosis or osteopenia by T score is indicative for specific treatment with biphosphonates, among which risedronate and alendronate have demonstrated to be more effective. Other indication for the treatment of these patients is based on the WHO&rsquo;s score FRAX. Finally, prevention must be done in every glucocorticoid chronic consumer, basically with changes in lifestyle and the daily intake of 1000-1500 mg of elemental calcium and 600 units of vitamin D.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A osteoporose é uma doença de alta prevalência no mundo e uma das causas mais importantes da forma secundária é o uso crônico de glicocorticóides; aproximadamente 0,5% da população mundial é usuária crônica destas drogas dadas as suas múltiplas indicações no tratamento de doenças reumáticas, pele, rim, pulmão e outros. Os doentes com osteoporose induzida por glucocorticóide apresentam complicações tais como fraturas de quadril que geram altos custos para os sistemas de saúde. Por isso é muito importante o diagnóstico precoce para dar tratamento imediato, devido a que são mais custo-efetiva que as suas complicações. São considerados de risco para osteoporose todos aqueles doentes que tomam 5 mg de prednisolona por dia ou mais, por um período mínimo de três meses, esses pacientes devem ser submetidos a densitometria óssea (DEXA), que é considerado o método diagnóstico de escolha para todos os tipos de osteoporose. Um escore T para diagnosticar a osteoporose ou osteopenia indicam o início de um tratamento específico, principalmente, com bifosfonatos, incluindo o risedronato e alendronato mostraram maior eficácia. Outra indicação para o tratamento específico seria baseado no risco de fratura definida pelo Índice OMS com FRAX. Finalmente, a prevenção deve ser feita em todos os pacientes usuários crônicos de glucocorticoides com medidas gerais que envolvem mudanças no estilo de vida e ingestão diária de 1000-1500 mg de cálcio elementar e 600 U de vitamina D.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[osteoporosis]]></kwd>
<kwd lng="es"><![CDATA[glucocorticoides]]></kwd>
<kwd lng="es"><![CDATA[toxicidad de medicamentos]]></kwd>
<kwd lng="en"><![CDATA[osteoporosis]]></kwd>
<kwd lng="en"><![CDATA[glucocorticoids]]></kwd>
<kwd lng="en"><![CDATA[drug toxicity]]></kwd>
<kwd lng="pt"><![CDATA[osteoporose]]></kwd>
<kwd lng="pt"><![CDATA[glucocorticoides]]></kwd>
<kwd lng="pt"><![CDATA[toxicidade de drogas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2"> </font>     <p align="right"><font size="2" face="verdana"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p align="center"><font face="verdana" size="4"><b>OSTEOPOROSIS ASOCIADA A GLUCOCORTICOIDES, UNA APROXIMACI&Oacute;N PR&Aacute;CTICA. REVISI&Oacute;N</b></font></p>     <p align="center"><font face="verdana" size="3"><b>OSTEOPOROSIS ASSOCIATED WITH GLUCOCORTICOIDS, A PRACTICAL APPROACH. A REVIEW</b></font></p>     <p align="center"><font face="verdana" size="3"><b>OSTEOPOROSE ASSOCIADA COM GLICOCORTIC&Oacute;IDES, UMA ABORDAGEM PR&Aacute;TICA. REVIS&Atilde;O</b></font></p>     <p align="center"><font face="verdana" size="2">JAMES MILTHON YURGAKY S. MD.<sup><b>a</b></sup>* Y ANA MAR&Iacute;A ARREDONDO G. MD.<sup><b>b</b></sup></font></p>      <p><font face="verdana" size="2"><sup><b>a</b></sup> Internista, residente Programa de Endocrinolog&iacute;a, Universidad Militar Nueva Granada, Bogot&aacute;, Colombia.    <br><sup><b>b</b></sup> Residente Programa de Medicina Interna, Universidad Militar Nueva Granada, Bogot&aacute;, Colombia.</font></p>  <font face="verdana" size="2">    <p>* Correspondencia: James Yurgaky <a href="mailto:jamesy7656@yahoo.es"/a>ojamesy7656@yahoo.es</a>. Direcci&oacute;n postal: correspondencia: Tr. 3 No 49-00, Servicio de Endocrinolog&iacute;a, Hospital Militar,Bogot&aacute;, Colombia. Tel&eacute;fono: 4 34 48 42</p>  <hr>      <br> Recibido: Octubre 22 de 2010. Aceptado: Diciembre 15 de 2010      ]]></body>
<body><![CDATA[<p><b>Resumen</b></p>     <p>La osteoporosis es una enfermedad de alta prevalencia en el mundo y una de las causas m&aacute;s importantes de su forma secundaria es el uso cr&oacute;nico de glucocorticoides; aproximadamente el 0,5% de la poblaci&oacute;n mundial es consumidora cr&oacute;nica de estos medicamentos, dadas sus m&uacute;ltiples indicaciones en el tratamiento de enfermedades reum&aacute;ticas, dermatol&oacute;gicas, pulmonares o renales entre otras. Los pacientes con osteoporosis inducida por glucocorticoides presentan complicaciones como la fractura de cadera, situaci&oacute;n que genera altos costos a los sistemas de salud. Por lo tanto, es muy importante hacer un diagn&oacute;stico r&aacute;pido para iniciar un tratamiento oportuno, debido a que la prevenci&oacute;n y el tratamiento de la enfermedad son menos costosos que el manejo de sus complicaciones. Se consideran en riesgo de osteoporosis todos aquellos pacientes que toman 5 mg diarios de prednisolona o m&aacute;s, por un tiempo m&iacute;nimo de tres meses; a estos pacientes se les debe realizar una densitometr&iacute;a &oacute;sea (DXA), que es el m&eacute;todo diagn&oacute;stico de elecci&oacute;n para todos los tipos de osteoporosis. Un T Score diagn&oacute;stico para osteoporosis u osteopenia indican el inicio de tratamiento espec&iacute;fico principalmente con bifosfonatos, entre los cuales el risedronato y alendronato han demostrado mejor efectividad. Otra de las indicaciones para el tratamiento espec&iacute;fico estar&iacute;a basada en el riesgo de fractura definido por la OMS con el Score FRAX. Finalmente, la prevenci&oacute;n se debe hacer en todo paciente usuario cr&oacute;nico de glucocorticoides con medidas generales que implican cambios en el estilo de vida y la ingesta diaria de 1000 a 1500 mg de calcio elemental y 600 u de vitamina D.</p>     <p><b>Palabras clave</b>: osteoporosis, glucocorticoides, toxicidad de medicamentos</p>  <hr>      <p><b>Abstract</b></p>     <p>Osteoporosis is a highly prevalent disease in the world and one of the most important causes of its secondary form is the chronic use of glucocorticoids; approximately 0.5% of the world's population is chronic consumer of this medicine because of its many indications in the treatment of rheumatic, dermatologic, pulmonary or renal diseases among others. Patients with glucocorticoid induced osteoporosis generates high costs for health systems derived from its complications, such as hip fractures, being more cost-effective the prevention and treatment of the disease than the management of its complications, that constitutes an important reason for its early diagnose and treatment. Every patient who takes prednisolone 5 mg daily or more for a minimum of three months is considered at risk of glucocorticoid induced osteoporosis; these patients should be screened with DXA, which is the election diagnostic method for all types of osteoporosis. Diagnosis of osteoporosis or osteopenia by T score is indicative for specific treatment with biphosphonates, among which risedronate and alendronate have demonstrated to be more effective. Other indication for the treatment of these patients is based on the WHO's score FRAX. Finally, prevention must be done in every glucocorticoid chronic consumer, basically with changes in lifestyle and the daily intake of 1000-1500 mg of elemental calcium and 600 units of vitamin D.</p>     <p><b>Key words</b>: osteoporosis, glucocorticoids, drug toxicity</p>  <hr>      <p><b>Resumo</b></p>     <p>A osteoporose &eacute; uma doen&ccedil;a de alta preval&ecirc;ncia no mundo e uma das causas mais importantes da forma secund&aacute;ria &eacute; o uso cr&ocirc;nico de glicocortic&oacute;ides; aproximadamente 0,5% da popula&ccedil;&atilde;o mundial &eacute; usu&aacute;ria cr&ocirc;nica destas drogas dadas as suas m&uacute;ltiplas indica&ccedil;&otilde;es no tratamento de doen&ccedil;as reum&aacute;ticas, pele, rim, pulm&atilde;o e outros. Os doentes com osteoporose induzida por glucocortic&oacute;ide apresentam complica&ccedil;&otilde;es tais como fraturas de quadril que geram altos custos para os sistemas de sa&uacute;de. Por isso &eacute; muito importante o diagn&oacute;stico precoce para dar tratamento imediato, devido a que s&atilde;o mais custo-efetiva que as suas complica&ccedil;&otilde;es. S&atilde;o considerados de risco para osteoporose todos aqueles doentes que tomam 5 mg de prednisolona por dia ou mais, por um per&iacute;odo m&iacute;nimo de tr&ecirc;s meses, esses pacientes devem ser submetidos a densitometria &oacute;ssea (DEXA), que &eacute; considerado o m&eacute;todo diagn&oacute;stico de escolha para todos os tipos de osteoporose. Um escore T para diagnosticar a osteoporose ou osteopenia indicam o in&iacute;cio de um tratamento espec&iacute;fico, principalmente, com bifosfonatos, incluindo o risedronato e alendronato mostraram maior efic&aacute;cia. Outra indica&ccedil;&atilde;o para o tratamento espec&iacute;fico seria baseado no risco de fratura definida pelo &Iacute;ndice OMS com FRAX. Finalmente, a preven&ccedil;&atilde;o deve ser feita em todos os pacientes usu&aacute;rios cr&ocirc;nicos de glucocorticoides com medidas gerais que envolvem mudan&ccedil;as no estilo de vida e ingest&atilde;o di&aacute;ria de 1000-1500 mg de c&aacute;lcio elementar e 600 U de vitamina D.</p>     <p><b>Palavras-chave</b>: osteoporose, glucocorticoides, toxicidade de drogas</p>  <hr>     <p><b>Introducci&oacute;n</b></p>     ]]></body>
<body><![CDATA[<p>La osteoporosis es una enfermedad frecuente que afecta en Norteam&eacute;rica, alrededor de ocho millones de mujeres y dos millones de hombres (1,2). Se produce como resultado final de diferentes procesos fisiopatol&oacute;gicos que generan una disminuci&oacute;n de la mineralizaci&oacute;n de la matriz &oacute;sea, incrementando el riesgo de fracturas axiales y perif&eacute;ricas, contribuyendo de esta manera a un aumento de la mortalidad general, as&iacute; como a un incremento en los costos derivados de las intervenciones quir&uacute;rgicas y de los cuidados institucionalizados de los pacientes con fractura de cadera, para el tratamiento integral de su enfermedad (3,4,5).</p>     <p>Los glucocorticoides son un grupo de medicamentos de alta potencia antiinflamatoria y bajo costo, que son ampliamente utilizados para el tratamiento de m&uacute;ltiples enfermedades dermatol&oacute;gicas, intestinales, pulmonares, renales, reumatol&oacute;gicas y para evitar el rechazo en pacientes trasplantados; esto hace que una gran cantidad de personas alrededor del mundo, sean usuarios cr&oacute;nicos de glucocorticoides y sufran de los efectos adversos tales como la osteoporosis secundaria (6,7).</p>     <p>Los efectos delet&eacute;reos de los corticoides sobre el hueso fueron descritos en conjunto con la enfermedad de Cushing alrededor de 1932; a pesar de ser los glucocorticoides ampliamente prescritos (en 0,5% de la poblaci&oacute;n general), la b&uacute;squeda activa de la osteoporosis inducida por estos medicamentos no se realiza en todos los pacientes que son consumidores cr&oacute;nicos (8). En un estudio realizado en Nothinghan, Reino Unido, se encontr&oacute; que de las 303 personas participantes que tomaban esta medicaci&oacute;n, solo el 14% ten&iacute;a implementada una estrategia para el diagn&oacute;stico temprano y reconocimiento de los trastornos de la densidad mineral &oacute;sea inducida por esteroides y menos del 6 % recibi&oacute; terapia preventiva espec&iacute;fica (9,10).</p>     <p>La dosis relacionada con efecto &oacute;seo delet&eacute;reo es usualmente 5 mg de prednisolona diaria o su equivalente por m&aacute;s de tres meses (9-12). Se ha demostrado que el uso intermitente de ciclos cortos de glucocorticoides a dosis de hasta 15 mg d&iacute;a de prednisolona en enfermedades cr&oacute;nicas como la artritis reumatoidea, no se ha relacionado con p&eacute;rdida de masa mineral &oacute;sea (14). Durante los &uacute;ltimos a&ntilde;os el inter&eacute;s por esta enfermedad ha venido creciendo; en la literatura hay varios estudios que indican claramente que para evitar en los pacientes el desarrollo de enfermedad mineral &oacute;sea derivada del empleo cr&oacute;nico de los glucocorticoides, se deben implementar medidas de prevenci&oacute;n, diagn&oacute;stico y terap&eacute;utica (13). Hasta este momento los resultados de los estudios que ha evaluado el uso de esteroides por v&iacute;a inhalada, no han dado una idea clara sobre el impacto que tiene sobre el hueso (15,16).</p>     <p><b>Fisiopatolog&iacute;a</b></p>     <p>La interacci&oacute;n entre esteroides y hueso es compleja; m&uacute;ltiples mecanismos se han relacionado con la pobre calidad mineral &oacute;sea que dan como resultado la disminuci&oacute;n en la formaci&oacute;n &oacute;sea e incremento de la resorci&oacute;n, entre otros su efecto directo sobre las c&eacute;lulas &oacute;seas, disminuyendo la producci&oacute;n de osteoblastos y osteoclastos, aumentando la apoptosis de osteoblastos y disminuyendo el tiempo de vida de los osteoclastos (<a href="img/revistas/med/v18n2/v18n2a07f01.jpg" target="_blank">figura 1</a>) (17). Los glucocorticoides ejercen su efecto en el hueso mediante mecanismos directos e indirectos; entre los indirectos, los cuales pueden generar un aumento en la p&eacute;rdida de la masa &oacute;sea y por lo consiguiente, un riesgo mayor en las ca&iacute;das est&aacute;n: la disminuci&oacute;n de la absorci&oacute;n de calcio en el intestino, el aumento de la excreci&oacute;n renal de calcio, la disminuci&oacute;n de la acci&oacute;n de los esteroides sexuales y de la hormona de crecimiento, la disminuci&oacute;n de la fuerza muscular y las alteraciones en la interacci&oacute;n musculoesquel&eacute;tica (18).</p>     <p>En los estudios realizados por Abu y col. y por Beavan y col., en los que se utilizaron anticuerpos policlonales de alta afinidad, se identific&oacute; la presencia de receptores espec&iacute;ficos citoplasm&aacute;ticos en los osteoblastos denominados receptores funcionales alfa de glucocorticoides, los cuales al unirse a su ligando, activan la v&iacute;as de se&ntilde;alizaci&oacute;n que generan una disminuci&oacute;n en la producci&oacute;n local de hueso nuevo (19,20)</p>     <p>Gracias a los estudios histomorfom&eacute;tricos se ha establecido con claridad, en pacientes expuestos cr&oacute;nicamente al uso de glucocorticoides, una disminuci&oacute;n en la formaci&oacute;n de nuevo hueso (21,22); de igual manera, al evaluar la viabilidad de los osteocitos se observ&oacute; una disminuci&oacute;n de la cantidad de c&eacute;lulas viables y un aumento de la apoptosis en estos pacientes, cuando se comparaban con individuos sanos (23,24). Los osteoclastos maduros no expresan receptores citoplasm&aacute;ticos de corticoides; sin embargo, a trav&eacute;s de la supresi&oacute;n de osteoprotegerina y del incremento del factor de transcripci&oacute;n nuclear NF-<sub>K</sub>B, altas dosis de glucocorticoides son capaces de inducir la diferenciaci&oacute;n de nuevos osteoclastos a partir de la l&iacute;nea monocito macr&oacute;fago (25,26).</p>     <p>Por otro lado, los esteroides son capaces de disminuir las concentraciones corporales de calcio, al disminuir hasta en un 30 % del valor basal la absorci&oacute;n intestinal al d&iacute;a catorce de administraci&oacute;n de prednisolona, e incrementar el valor de excreci&oacute;n renal de calcio hasta dos veces despu&eacute;s de cinco d&iacute;as de medicaci&oacute;n, esto independiente de la vitamina D y sus metabolitos activos (23,24). Al final, todos estos procesos generan una fragilidad notable del sistema esquel&eacute;tico que da como resultado un riesgo estimado mayor de fractura vertebral (RR= 2,86; IC 95%, 2,56-3,16) y de fractura de cadera (RR= 2,01; IC 95%, 1,74-2,29) comparado con la poblaci&oacute;n que no usa este tipo de medicaci&oacute;n (27,28). No solo el uso cr&oacute;nico de esteroides es el que facilitan la p&eacute;rdida de la masa mineral &oacute;sea; tambi&eacute;n la inducen algunos polimorfismos gen&eacute;ticos, como en el caso de los pacientes con insuficiencia adrenal (Enfermedad de Addison), en quienes se demostr&oacute; que el polimorfismo C3435T de la glicoprote&iacute;na P transportador se asocia con aumento en la sensibilidad a los glucocorticoides y a la p&eacute;rdida mineral &oacute;sea secundaria, sobre todo cuando se usan dosis de hidrocortisona mayores a 25 mg d&iacute;a. (29)</p>     <p><b>Riesgo de fractura</b></p>     ]]></body>
<body><![CDATA[<p>La presentaci&oacute;n de fracturas vertebrales y no vertebrales en pacientes sometidos a uso cr&oacute;nico de esteroides est&aacute; en relaci&oacute;n con varios factores; el primero de ellos es el tiempo de uso del medicamento, as&iacute; como la dosis recibida del mismo; ingerir glucocorticoides por un a&ntilde;o consecutivo, incrementa el riesgo de fractura vertebral hasta 5,9 veces y de cadera hasta 5,0 veces, con aumento acumulado del porcentaje durante el primer a&ntilde;o de fractura vertebral sintom&aacute;tica o no en un 54% (31). De acuerdo a la dosis recibida se puede discriminar el riesgo de cualquier fractura de la siguiente manera (32,33):</p> <ul>     <li>Prednisolona 2,5-7,5 mg v.o. d&iacute;a: raz&oacute;n de riesgo 1,77</li>     <li>Prednisolona &gt; 7,5 mg v.o. d&iacute;a: raz&oacute;n de riesgo 2,27</li>     </ul>     <p>Por otro lado, es importante recalcar que la presencia de un determinado valor de densidad mineral &oacute;sea, no se relaciona directamente con un menor riesgo de fractura; el Dr. Hiroshi KAJI pudo demostrar en mujeres quienes hab&iacute;an usado en forma cr&oacute;nica glucocorticoides, que el umbral para la presentaci&oacute;n de fracturas relacionado con la densidad mineral &oacute;sea medida por densitometr&iacute;a &oacute;sea, es m&aacute;s alto en aquellos pacientes que sufren fracturas comparado con los que no, 0,807 g/cm<sup>3</sup> vs 0,716 g/cm<sup>3</sup> en columna; 0,61 g/cm<sup>3</sup> vs 0,581 g/cm<sup>3</sup> en femur y 0,592 g/cm<sup>3</sup> vs 0,477 g/cm<sup>3</sup> en radio respectivamente(32,33).</p>     <p>    <center><img src="img/revistas/med/v18n2/v18n2a07t01.jpg"></a></center></p>      <p><b>Diagn&oacute;stico espec&iacute;fico</b></p>     <p>En el examen f&iacute;sico se pueden observar ciertas  caracter&iacute;sticas que pueden indicar con alta especificidad que el paciente ha estado  expuesto en forma cr&oacute;nica a los glucocorticoides; dentro de estos se destacan  la cara de luna llena, sangrado f&aacute;cil, adelgazamiento cut&aacute;neo y la miopat&iacute;a  proximal (30,31). En este contexto, la sospecha de efectos delet&eacute;reos en la  densidad mineral &oacute;sea es mucho m&aacute;s alta si se compara con la mayor&iacute;a de los  pacientes que usan glucocorticoides y que no tienen este tipo de  caracter&iacute;sticas; por esta raz&oacute;n, se han dise&ntilde;ado protocolos para la detecci&oacute;n  temprana de osteopenia y osteoporosis.</p>     <p>La histomorfometr&iacute;a sigue siendo la prueba de oro para el diagn&oacute;stico de la  osteoporosis (32,33), pero como es un procedimiento invasivo con una alta  morbilidad, la organizaci&oacute;n mundial de la salud (OMS) ha abalado a la  densitometr&iacute;a &oacute;sea (DXA) como m&eacute;todo para la b&uacute;squeda de osteoporosis  independiente de la etiolog&iacute;a que la origine (34,35,36); se ha definido que el  punto de corte para el <i>T score</i> menor de -1,0 y -2,5, establece el  diagn&oacute;stico de osteopenia y osteoporosis respectivamente. En general, a los  pacientes que tengan historia de uso cr&oacute;nico de esteroides o que vayan a  recibirlos por m&aacute;s de tres meses se les debe realizar una densitometr&iacute;a y si el  resultado es normal o se diagnostica una osteoporosis o una osteopenia se debe  hacer un seguimiento cada tres a&ntilde;os o anual o bianual respectivamente (35,36). </p>     ]]></body>
<body><![CDATA[<p>Aunque estas medidas deben estar  bien establecidas en los programas de usuarios cr&oacute;nicos de corticoides, es  interesante anotar que los estudios realizados en pacientes en riesgo y con  alteraciones de la densidad mineral &oacute;sea han mostrado que la indicaci&oacute;n de la  densitometr&iacute;a solo se hace en el 5 al 12% de los pacientes (37). Los resultados  de los estudios sobre programas de educaci&oacute;n para pacientes y m&eacute;dicos tratantes  de usuarios cr&oacute;nicos de corticoides han sido divergentes, ya que algunos han  mostrado un aumento en la solicitud de ex&aacute;menes para el diagn&oacute;stico temprano y  la prescripci&oacute;n de medicamentos para la prevenci&oacute;n temprana de la osteoporosis,  mientras que otros, no han mostrado ning&uacute;n cambio en el comportamiento de los  pacientes ni en el de los m&eacute;dicos tratantes (38,39).</p>     <p>Estudios transversales y longitudinales en los que se  compararon pacientes en terapia con glucocorticoides vs controles sanos, se  document&oacute; un incremento del riesgo de fractura en el primer grupo, a pesar de  tener densidad mineral &oacute;sea m&aacute;s alta, (32,33,40,41). Otros m&eacute;todos tales como  la ecograf&iacute;a de calc&aacute;neo, tomograf&iacute;a computarizada cuantitativa y los  marcadores de resorci&oacute;n &oacute;sea, tienen una utilidad limitada debido a una  ausencia notable de criterios uniformes que no permiten estandarizar el  diagn&oacute;stico (42,43).</p>     <p><b>Prevenci&oacute;n</b></p>     <p>Los dos objetivos primordiales deben orientarse hacia la  prevenci&oacute;n de fracturas vertebrales y no vertebrales, as&iacute; como a la disminuci&oacute;n  de la tasa de p&eacute;rdida de hueso que se genera una vez se instaura el tratamiento  con glucocorticoides (44). Las medidas generales incluyen una dieta rica en  calcio elemental que garantice un consumo diario entre 1000 a 1500 mg, con un  suplemento de vitamina D de 600 UI para todos los pacientes consumidores de  esteroides por m&aacute;s de tres meses (45,46); adicionalmente se recomienda realizar  ejercicio regular por lo menos 150 minutos semanales, lo cual ha demostrado que  reduce la absorci&oacute;n de los glucocorticoides orales y por lo tanto se cree, puede  disminuir sus efectos adversos (47).</p>     <p>Tambi&eacute;n se recomienda la abstinencia de tabaco,  disminuci&oacute;n del consumo de alcohol y caf&eacute; y aumento de esfuerzos encaminados  para disminuir las ca&iacute;das en personas con factores de riesgo (45,46). El uso de  la dosis m&iacute;nima de corticoide necesaria para el tratamiento disminuir&iacute;a la  presentaci&oacute;n de la osteoporosis en algunos pacientes, ya que la p&eacute;rdida de masa  mineral &oacute;sea se asocia con dosis mayores a 5 mg diarios de prednisona por m&aacute;s  de tres meses, dosis que se podr&iacute;a reducir en algunos pacientes que as&iacute; lo  toleren (48).</p>     <p><b>Indicaciones de tratamiento</b></p>     <p>Inicialmente hubo controversia  respecto del momento de inicio del tratamiento en este tipo de pacientes;  actualmente se ha llegado a un consenso gracias a los resultados que se  reportan en la literatura, de los diferentes m&eacute;todos que se han usado para  determinar el momento propicio para el inicio de intervenciones terap&eacute;uticas  (31); por ejemplo, en mujeres postmenop&aacute;usicas y hombres mayores de 50 a&ntilde;os se  usa el FRAX (herramienta de evaluaci&oacute;n de riesgo de fractura) que ha sido  recientemente desarrollada por la OMS y es &uacute;til para decidir el inicio de  tratamiento espec&iacute;fico (Tabla 1); por otro lado, usando las escalas de  puntuaci&oacute;n obtenidas por an&aacute;lisis multivariado se puede determinar el riesgo de  fractura a cinco a&ntilde;os; as&iacute; los valores de 30, 40 y 50 puntos indican un riesgo  de 6,2%, 15,2% y 35,2% respectivamente, para los pacientes que son usuarios de  glucocorticoides (<a href="img/revistas/med/v18n2/v18n2a04t01.jpg" target="_blank">Tabla 2</a>) (31).</p> <ol>     <li>Pacientes con  diagn&oacute;stico de osteopenia con un <i>T score</i> menor de -1,0 y que hayan  recibido por m&aacute;s de tres meses prednisolona a dosis de 5 mg d&iacute;a o su  equivalente (31).</li>     <li>Todos aquellos  pacientes en quienes se documente osteoporosis (<i>T score</i> menor a -2,5)  (49,50).</li>     <li>C&aacute;lculo de riesgo  de fractura por score de FRAX superior a 3% para cadera y m&aacute;s de 20% para  cualquier tipo de fractura.</li>     ]]></body>
<body><![CDATA[</ol>     <p><b>Costoefectividad  del tratamiento</b></p>     <p>El costo de  esta enfermedad para los sistemas de salud locales, as&iacute; como el impacto que  tienen las medidas terap&eacute;uticas en la prevenci&oacute;n de fracturas y la calidad de  vida de los pacientes, analizados en el contexto de la farmacoeconom&iacute;a, son una  herramienta &uacute;til para el m&eacute;dico al justificar aun m&aacute;s los esfuerzos encaminados  a la detecci&oacute;n y tratamiento tempranos de las alteraciones metab&oacute;licas &oacute;seas en  pacientes con uso cr&oacute;nico de glucocorticoides (4,5,51,52).</p>     <p>En mujeres  tratadas con esteroides, el uso de vitamina D y calcio reduce la presentaci&oacute;n  de fracturas en un 40% a 10 a&ntilde;os, con un costo aproximado de 800 d&oacute;lares por  fractura evitada; los costos generados por el etidronato y el alendronato son  m&aacute;s altos, son alrededor de los 2000 y 3000 d&oacute;lares respectivamente (51,52).  Por cada a&ntilde;o de calidad de vida ganado en pacientes tratados con 5mg de  prednisolona diaria, se invierten alrededor de 68 d&oacute;lares anuales; a dosis m&aacute;s  altas de 15 mg diarios, el costo de cada a&ntilde;o de vida ganado se incrementa.</p>     <p>El uso de  un bifosfonato cuesta en promedio 471 d&oacute;lares anuales; sin embargo, esto  resulta poco si se compara con el costo del tratamiento para pacientes que  sufren fracturas osteopor&oacute;ticas de cadera, el cual puede ser equivalente a unos  51000 d&oacute;lares durante el primer a&ntilde;o y 39000 d&oacute;lares anuales en todas aquellas  personas que requieren a una tercera persona para su cuidado despu&eacute;s del evento  inicial (4,5). En general, los costos generados por el tratamiento de los  diferentes tipos de fracturas, as&iacute; como lo requerido para la prevenci&oacute;n de las  mismas, est&aacute; determinado por cuatro factores importantes que son: la edad del  paciente, la capacidad de auto cuidado del mismo, la dosis de esteroide  recibida y la localizaci&oacute;n de la fractura (4,5).</p>     <p><b>&iquest;Con qu&eacute; tratar?</b></p>     <p>Existe un  n&uacute;mero representativo de estudios que han evaluado los diferentes grupos  farmacol&oacute;gicos, para la prevenci&oacute;n de riesgo de fractura vertebral y no  vertebral en pacientes sometidos a uso cr&oacute;nico de esteroides; en general, los  medicamentos que cuentan con mejor evidencia cl&iacute;nica son los antirresortivos,  siendo el risedronato en primer lugar y el alendronato como segunda opci&oacute;n los  que m&aacute;s fortaleza y mejores desenlaces han mostrado; por otro lado,  medicamentos como el raloxifeno y el ranelato de estroncio, no cuentan con  estudios aleatorizados prospectivos que permitan valorar su utilidad en la  prevenci&oacute;n y tratamiento de la osteoporosis inducida por esteroides.</p>     <p>Recientemente  se aprob&oacute; el &aacute;cido zoledr&oacute;nico para el tratamiento de osteoporosis inducida por  esteroides basados en la informaci&oacute;n obtenida de un estudio multic&eacute;ntrico,  randomizado, doble ciego de no inferioridad que compar&oacute; esta mol&eacute;cula con el  risedronato y se observ&oacute; que el incremento de la DMO fue de 2,06 % vs 0,64 %  obtenido con el risedronato; tambi&eacute;n se evidenci&oacute; una menor presentaci&oacute;n de  fracturas vertebrales en el grupo de pacientes tratados con &aacute;cido zoledr&oacute;nico  vs risedronato (71).</p>     <p>Existen  varios estudios en modelos animales con an&aacute;logos de la hormona paratifoidea,  que en teor&iacute;a tiene ventajas para el tratamiento de la osteoporosis inducida  por corticosteroides, ya que su mecanismo de acci&oacute;n en la fisiolog&iacute;a &oacute;sea es  contrarrestar el efecto que ejercen los corticoides; sin embargo en el campo  cl&iacute;nico, existen solo estudios peque&ntilde;os y con un seguimiento no mayor a 18  meses, en los que se demuestra que teriparatide tiene una ventaja sobre el  alendronato en cuanto al aumento de la densidad mineral &oacute;sea, en donde hay una  diferencia significativa en fracturas de cadera y con disminuci&oacute;n en la tasa de  fracturas vertebrales a dos a&ntilde;os, pero no hay diferencias significativas en  otro tipo de fracturas (69). Algo similar ocurre con la terapia de suplencia  hormonal, el fluoruro s&oacute;dico, la calcitonina y los metabolitos de la vitamina D  con los que no se ha observado una disminuci&oacute;n en la tasa de fracturas en los  estudios de valoraci&oacute;n (51-59). En la <a href="#tab3">tabla 3</a> se registran algunos de los  estudios que han evaluado diferentes f&aacute;rmacos utilizados para el tratamiento de  osteoporosis en estos pacientes. </p>     <p>    ]]></body>
<body><![CDATA[<center><a name= "tab3"><img src="img/revistas/med/v18n2/v18n2a07t03.jpg"></a></center></p>     <p>El  denosumab es un anticuerpo monoclonal contra el RANKL (ligando del receptor  activador del factor nuclear <sub>K</sub>B), aprobado por la FDA para el  tratamiento de osteoporosis posmenop&aacute;usica; sin embargo, en osteoporosis  inducida por esteroides no hay suficiente informaci&oacute;n que permita recomendar su uso.</p>     <p><b>Conclusiones</b></p>     <p>1. La osteoporosis asociada a  glucocorticoides es una enfermedad frecuente y subdiagnosticada.</p>     <p>2. Todo paciente con uso de  prednisolona 5 mg/ d&iacute;a vo o su equivalente por m&aacute;s de tres meses debe recibir  en promedio calcio elemental 1200 mg diarios y vitamina D 600 u al d&iacute;a.</p>     <p>3. Los pacientes a quienes por su  enfermedad de base se deba suministrar tratamiento por m&aacute;s de tres meses con  glucocorticoides sist&eacute;micos a dosis de prednisolona 5 mg/d&iacute;a vo, deben tener  una densitometr&iacute;a inicial, una anual como control si se diagnostica  osteoporosis, bianual si se diagnostica osteopenia y cada tres a&ntilde;os si esta  dentro de l&iacute;mites normales.</p>     <p>4. Es aconsejable realizar una  densitometr&iacute;a basal en todo paciente que tenga historia de uso de  glucocorticoide de manera cr&oacute;nica y hacer seguimiento de acuerdo al diagn&oacute;stico  densitom&eacute;trico.</p>     <p>5. Pacientes con uso cr&oacute;nico de  esteroides y diagn&oacute;stico densitom&eacute;trico de osteopenia, con T score inferior a  -1, ameritan tratamiento con bifosfonato.</p>     <p>6. Pacientes con diagn&oacute;stico de  osteoporosis dado por T score inferior a -2,5, deben recibir tratamiento con  bifosfonato.</p>     <p>7. Dentro de los medicamentos  estudiados para el tratamiento y la prevenci&oacute;n de la osteoporosis asociada a  glucocorticoides, los que cuentan con un estudio m&aacute;s extenso que valor&oacute; riesgo  de fractura as&iacute; como impacto sobre la densidad mineral &oacute;sea, son de primera  elecci&oacute;n el risedronato y en segunda instancia el alendronato.</p>     ]]></body>
<body><![CDATA[<p>8. Medicamentos como la  calcitonina, ranelato de estroncio, fluoruro de calcio y la terapia de  suplencia hormonal, no tienen estudios que respalden el uso de los mismos para  la prevenci&oacute;n y tratamiento de la enfermedad &oacute;sea inducida por glucorticoides.</p>     <p>El flujograma de la <a href="#fig2">figura 2</a> resume las acciones que se  deben tomar para el diagn&oacute;stico y el tratamiento de la osteoporosis inducida  por glucocorticoides.</p>     <p>    <center><a name= "fig2"><img src="img/revistas/med/v18n2/v18n2a07f02.jpg"></a></center></p> <hr>      <p><b>Referencias</b>     <!-- ref --><p>1. Chapurlat R, Gamero P, Sornay-Rendu E,  Arlot M, Claustrat B, Delmas P. Longitudinal study of bone loss in pre and  perimenopausal women: evidence for bone loss in perimenopausal women. Osteoporos  Int. 2000; 11(6):493-8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000078&pid=S0121-5256201000020000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Lindsay R, Nieves J, Golden A, Kelsey J.  Bone mass among premenopausal women. Int J Fertil Menopausal Stud. 1993;38  Suppl 2:83-7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000079&pid=S0121-5256201000020000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>3. National Osteoporosis Foundation.  Physician's guide to prevention and treatment of osteoporosis. 2008 [Citado oct 2010].  Disponible en <a href="http://www.nof.org/professionals/Clinicians_Guide.htm"target="_blank">http://www.nof.org/professionals/Clinicians_Guide.htm</a>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000080&pid=S0121-5256201000020000700003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>4. Van Staa TP, Geusens P, Zhang B,  Leufkens HGM, Boonen A, Cooper C. Individual fracture risk and the  cost-effectiveness of bisphosphonates in patients using oral glucocorticoids. Rheumatology.  2007; 46(3):460-466.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000081&pid=S0121-5256201000020000700004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>5. Van Staa TP, Kanis JA, Geusens P, Boonen  A, Leufkens HG, Cooper C. The cost-effectiveness of bisphosphonates in  postmenopausal women based on individual long-term fracture risks. Value  Health. 2007;10(5):348-57.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000082&pid=S0121-5256201000020000700005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>6. Summey BT, Yosipovitch G.  Glucocorticoid-induced bone loss in dermatologic patients: an update. Arch  Dermatol. 2006;142(1):82-90.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000083&pid=S0121-5256201000020000700006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>7. Dore RK. How to prevent  glucocorticoid-induced osteoporosis. Cleve Clin J Med. 2010;77(8):529-36.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000084&pid=S0121-5256201000020000700007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>8. Guzman-Clark JR, Fang MA, Sehl ME,  Traylor L, Hahn TJ. Barriers in the management of glucocorticoid-induced  osteoporosis. Arthritis Rheum. 2007;57(1):140-6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000085&pid=S0121-5256201000020000700008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>9. Walsh L, Wong C, Pringle M, Tattersfield  A. Use of oral corticosteroids in the community and the prevention of secondary  osteoporosis: a cross sectional study. BMJ. 1996; 313 (7053): 344-6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000086&pid=S0121-5256201000020000700009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>10. Smith MD, Cheah SP, Taylor K, Ahern MJ.  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