<?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>S0121-81232012000300003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Historia del tratamiento de las vasculitis primarias]]></article-title>
<article-title xml:lang="en"><![CDATA[History of treatment of primary vasculitis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iglesias-Gamarra]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peñaranda-Parada]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cajas-Santana]]></surname>
<given-names><![CDATA[Luis Javier]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintana-López]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Restrepo-Suárez]]></surname>
<given-names><![CDATA[José Felix]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arbeláez-Cortés]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rondón-Herrera]]></surname>
<given-names><![CDATA[Federico]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Clínica de Artritis Temprana S.A.S  ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2012</year>
</pub-date>
<volume>19</volume>
<numero>3</numero>
<fpage>131</fpage>
<lpage>157</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-81232012000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-81232012000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-81232012000300003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las vasculitis primarias constituyen un grupo de enfermedades reumáticas con expresión clínica variable y pronóstico reservado cuando no se tratan adecuadamente. En esta revisión haremos un análisis pormenorizado del tratamiento en las diferentes formas de vasculitis primaria, iniciando con el uso de los corticoides, desde casi su descubrimiento en 1949, pasando por otros inmunosupresores como: ciclofosfamida, metotrexate, azatioprina, mofetil, micofenolato, al igual que medicamentos biológicos como rituximab y anti-TNF. Una mención especial se hace sobre las guías de tratamientos para las vasculitis, tanto de grandes como de pequeños vasos, implementadas desde 2009 por el Grupo Europeo de Estudio de las Vasculitis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Primary vasculitis is one of the rheumatic diseases with variable clinical expression and poor prognosis when not treated properly. In this review we analyze detailed treatment of this disease in different forms of primary vasculitis, starting with the use of corticosteroids from almost its discovery in 1949, to other immunosuppressant's such as cyclophosphamide, methotrexate, azathioprine, mycophenolate mofetil, as well as biological drugs such as rituximab and anti-TNF. Special mention is made on the guidelines of treatment for vasculitis of both large and small vessel, implemented since 2009 by the European Group Study of Vasculitis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[vasculitis primarias]]></kwd>
<kwd lng="es"><![CDATA[granulomatosis con poliangeitis]]></kwd>
<kwd lng="es"><![CDATA[arteritis de Takayasu]]></kwd>
<kwd lng="es"><![CDATA[poliarteritis nodosa]]></kwd>
<kwd lng="es"><![CDATA[poliangeítis microscópica]]></kwd>
<kwd lng="es"><![CDATA[arteritis de células gigantes]]></kwd>
<kwd lng="en"><![CDATA[Primary vasculitis]]></kwd>
<kwd lng="en"><![CDATA[Wegener granulomatosis]]></kwd>
<kwd lng="en"><![CDATA[Takayasu arteritis]]></kwd>
<kwd lng="en"><![CDATA[poliarteritis nodosa]]></kwd>
<kwd lng="en"><![CDATA[microscopic poliangeitis]]></kwd>
<kwd lng="en"><![CDATA[giant cell arteritis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p><b>ARTICULO DE REVISI&Oacute;N</b></p>     <p>    <center><font size="4"><b>Historia del tratamiento de las vasculitis primarias</b></font></center></p>     <p>    <center><font size="3"><b>History of treatment of primary vasculitis</b></font></center></p>     <p>    <center><i>Antonio Iglesias-Gamarra</i><sup>1</sup>, <i>Edgar Pe&ntilde;aranda-Parada</i><sup>1</sup>, <i>Luis Javier Cajas-Santana</i><sup>1</sup>, <i>Gerardo Quintana-L&oacute;pez</i><sup>1</sup>, <i>Jos&eacute; Felix Restrepo-Su&aacute;rez</i><sup>1</sup>, <i>&Aacute;lvaro Arbel&aacute;ez-Cort&eacute;s</i><sup>2</sup>, <i>Federico Rond&oacute;n-Herrera</i><sup>1</sup></center></p>      <p><sup>1</sup>Departamento de Medicina Interna. Facultad de Medicina. Universidad Nacional de Colombia. Bogot&aacute;, Colombia.    <br> <sup>2</sup>Cl&iacute;nica de Artritis Temprana S.A.S; Cali, Colombia.</p>     ]]></body>
<body><![CDATA[<p>Correspondencia: Antonio Iglesias Gamarra: <a href="mailto:iglesias.antonio1@gmail.com">iglesias.antonio1@gmail.com</a></p>      <p>Los autores declaran no presentar ning&uacute;n conflicto de inter&eacute;s al momento de la redacci&oacute;n del manuscrito.</p>      <p>Recibido: 23 de julio de 2012 - Aceptado: 1 de septiembre de 2012</p> <hr>     <p><font size="3"><b>Resumen</b></font></p>     <p>Las vasculitis primarias constituyen un grupo de enfermedades reum&aacute;ticas con expresi&oacute;n cl&iacute;nica variable y pron&oacute;stico reservado cuando no se tratan adecuadamente. En esta revisi&oacute;n haremos un an&aacute;lisis pormenorizado del tratamiento en las diferentes formas de vasculitis primaria, iniciando con el uso de los corticoides, desde casi su descubrimiento en 1949, pasando por otros inmunosupresores como: ciclofosfamida, metotrexate, azatioprina, mofetil, micofenolato, al igual que medicamentos biol&oacute;gicos como rituximab y anti-TNF. Una menci&oacute;n especial se hace sobre las gu&iacute;as de tratamientos para las vasculitis, tanto de grandes como de peque&ntilde;os vasos, implementadas desde 2009 por el Grupo Europeo de Estudio de las Vasculitis.</p>     <p><b>Palabras clave</b>: vasculitis primarias, granulomatosis con poliangeitis, arteritis de Takayasu, poliarteritis nodosa, poliange&iacute;tis microsc&oacute;pica, arteritis de c&eacute;lulas gigantes.</p>  <hr>     <p><font size="3"><b>Summary</b></font></p>     <p>Primary vasculitis is one of the rheumatic diseases with variable clinical expression and poor prognosis when not treated properly. In this review we analyze detailed treatment of this disease in different forms of primary vasculitis, starting with the use of corticosteroids from almost its discovery in 1949, to other immunosuppressant's such as cyclophosphamide, methotrexate, azathioprine, mycophenolate mofetil, as well as biological drugs such as rituximab and anti-TNF. Special mention is made on the guidelines of treatment for vasculitis of both large and small vessel, implemented since 2009 by the European Group Study of Vasculitis.</p>     <p><b>Key words</b>: Primary vasculitis, Wegener granulomatosis, Takayasu arteritis, poliarteritis nodosa, microscopic poliangeitis, giant cell arteritis.</p> <hr>     <p><font size="3"><b>Introducci&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p>Antes de 1950, la morbimortalidad asociada a las vasculitis primarias era muy alta, un ejemplo de ello era que la mediana de la sobrevida era de apenas cinco meses en la granulomatosis con poliangeitis (Granulomatosis de Wegener), y la mortalidad era similar en cualquier caso de vasculitis primaria y secundaria.</p>     <p>El uso de los glucocorticoides se inici&oacute;, el 21 de septiembre de 1948, para el tratamiento de una paciente con artritis reumatoide que se encontraba hospitalizada en la Cl&iacute;nica Mayo, por un grupo de investigadores extraordinarios conformado por Hench, Kendal, Slocumb y Polley, quienes hab&iacute;an descubierto la mol&eacute;cula y se iniciaba su utilizaci&oacute;n en la cl&iacute;nica<sup>1,2</sup>. La cortisona fue introducida por los reumat&oacute;logos para el manejo de las vasculitis primarias, consideradas enfermedades "hu&eacute;rfanas" porque no ten&iacute;an tratamiento efectivo; de igual manera se conocieron los eventos adversos presentados por los corticoides, descritos por Polley y Slocumb<sup>3</sup>. Para que la historia del tratamiento de las vasculitis se pueda comprender coherentemente, debe leerse en el orden cronol&oacute;gico de la descripci&oacute;n de los medicamentos y en el inicio de su prescripci&oacute;n en la enfermedad. Empezaremos esta historia con los glucocorticoides, porque fueron los primeros que se formularon para la terapia de las vasculitis.</p>     <p><font size="3"><b>Uso de la cortisona en vasculitis</b></font></p>     <p>La cortisona que se sintetiz&oacute; en la Cl&iacute;nica Mayo, se utiliz&oacute; por primera vez para tratar la artritis reumatoidea en 1948-1949, y la fiebre reum&aacute;tica en 1949. Se postul&oacute; que podr&iacute;a utilizarse para tratar la panarteritis nodosa (PAN), que junto con el lupus eritematoso sist&eacute;mico fueron denominadas enfermedades del col&aacute;geno por Klemperer, Pollack y Baehr<sup>4</sup> en 1942.</p>     <p>Archie H. Baggenstoss, Richard M. Shick y Howard F Polley<sup>5,6</sup>, la utilizaron por primera vez en un m&eacute;dico de 45 a&ntilde;os que consult&oacute; a la Cl&iacute;nica Mayo en Rochester, el 18 de julio de 1949, con un cuadro grave caracterizado por compromiso constitucional y con da&ntilde;o de varios &oacute;rganos como piel, coraz&oacute;n, ri&ntilde;&oacute;n, tracto gastrointestinal y pulm&oacute;n; se le administr&oacute; la cortisona el 28 de julio de 1949, diez d&iacute;as despu&eacute;s de su admisi&oacute;n, con un diagn&oacute;stico de PAN. Este paciente fue tratado durante 75 d&iacute;as y recibi&oacute; 3.62 g de cortisona; a las 48 horas el paciente present&oacute; mejor&iacute;a, pero finalmente falleci&oacute;. En la autopsia se observ&oacute; una mejor&iacute;a de las lesiones vascul&iacute;ticas en las arterias de mediano calibre. El segundo caso, fue una paciente de 48 a&ntilde;os de edad, quien consult&oacute; dos meses despu&eacute;s, estuvo bajo observaci&oacute;n por 146 d&iacute;as y recibi&oacute; 13.72 g de cortisona. Ambos pacientes murieron por fallas cardiaca y renal. El tratamiento de estos dos pacientes con cortisona permiti&oacute; analizar la mayor&iacute;a de los aspectos inflamatorios, as&iacute; como las lesiones histol&oacute;gicas de la enfermedad.</p>     <p>En 1951, Drury, Hickey y Malone<sup>7</sup> del <i>Mater Misericordiae Hospital </i>en Dubl&iacute;n, utilizaron la cortisona para tratar un paciente de 47 a&ntilde;os. Lo importante de este caso es que se us&oacute; el t&eacute;rmino mononeuritis m&uacute;ltiple por primera vez, denominaci&oacute;n que utilizaron Lovshin y Kernohan en 1949, quienes la hab&iacute;an observado en ocho casos<sup>7</sup>.</p>     <p><font size="3"><i>The Medical Research Council by the Collagen Diseases and Hypersensitive Panel</i></font></p>     <p>En las d&eacute;cadas de los a&ntilde;os 1940 y 1950 las vasculitis primarias eran entidades desconocidas, proponi&eacute;ndose el mecanismo de hipersensibilidad para explicar algunos elementos patog&eacute;nicos liderados por Rich<sup>8,9</sup>.</p>     <p>Rackemann y Greene en 1939<sup>10</sup> y Rich y Gregory<sup>9 </sup>en 1943, explicaban la etiolog&iacute;a de la PAN como un proceso mediado por hipersensibilidad; otros como Harkavy<sup>11</sup> la explicaban como una alergia, y Friedberg y Cross<sup>12</sup> como de origen estreptoc&oacute;cico. Para esta &eacute;poca s&oacute;lo se utilizaban la sulfonamida, la penicilina y la difenhidramina para el tratamiento de esta patolog&iacute;a. Dada la carencia de medicamentos y la poca casu&iacute;stica, el profesor Geofrey. A Rose<sup>13</sup> organiza un peque&ntilde;o comit&eacute; para manejar a estos pacientes con cortisona y ACTH, que era con lo &uacute;nico que se contaba como tratamiento para un gran n&uacute;mero de enfermedades "hu&eacute;rfanas" de la &eacute;poca, aduciendo que los glucocorticoides eran beneficiosos en aquellas patolog&iacute;as relacionadas con "hipersensibilidad" y "alergia". El profesor Geofrey A. Rose, quien trabajaba en el <i>St. Mary Hospital </i>y en el <i>Paddington General </i>Hospital, de Londres, realiz&oacute; el primer trabajo serio sobre una de las vasculitis primarias, incluyendo los pacientes de nueve centros de ense&ntilde;anza (hospitales universitarios), desde 1946 hasta 1953, con diagn&oacute;stico de PAN, obteniendo biopsias en diferentes tejidos de 111 pacientes y con la participaci&oacute;n de m&eacute;dicos ingleses y norteamericanos, siendo &eacute;ste uno de los primeros estudios multic&eacute;ntricos realizados en el mundo<sup>13</sup>.</p>     <p>Rose organiza un panel que logra asociar a los mejores cl&iacute;nicos de la &eacute;poca, los profesores: G. W Pickering, EGL. Bywaters, J F. Danielli, PG. Gell, J.H. Kellgren, DA. Long, A. Neuberger, H. Nicholson, FTG. Prunty, AHT. Robb-Smith, G. Payling Wrigh, JR. Duthrie y E.T. Conybear. El panel se organiza en 1950, siendo ese momento contempor&aacute;neo a la s&iacute;ntesis de la cortisona y de la ACTH. Su primer objetivo era recopilar los pacientes con diagn&oacute;stico de panarteritis nodosa, 111 en total, a quienes se les practic&oacute; biopsia y se compararon con un grupo control retrospectivo; por primera vez se realiza un estudio de casos y controles y la cortisona se utiliza en el grupo con tratamiento, concluyendo que la cortisona mejora los s&iacute;ntomas y signos de la enfermedad, pero, adem&aacute;s, plantea que los grupos retrospectivos no son adecuados e informa sobre los eventos adversos secundarios de los esteroides. El estudio con cortisona se logr&oacute; realizar en 17 pacientes<sup>13</sup>.</p>     ]]></body>
<body><![CDATA[<p>Algunos art&iacute;culos mencionan el uso de la cortisona en el trabajo cl&aacute;sico de Jacob Churg y Lotte Strauss sobre la ange&iacute;tis al&eacute;rgica y granulomatosa<sup>14,15</sup>; sin embargo, al revisar el texto original no se menciona, pero es factible que &eacute;sta ya se haya utilizado dado que Louis Sofer, de este mismo hospital, (Monte Sina&iacute; de Nueva York) ya la prescrib&iacute;a para el tratamiento del lupus eritematoso sist&eacute;mico. A pesar de que todos los informes sobre la evoluci&oacute;n de los pacientes con este medicamento reportan beneficio, cinco a&ntilde;os despu&eacute;s, en el trabajo de Kulka<sup>16</sup>, se describen claramente las complicaciones de la vasculitis reumatoide, como el compromiso segmentario de los nervios perif&eacute;ricos, el infarto del miocardio, la perforaci&oacute;n y la hemorragia gastrointestinales, afirmando, adem&aacute;s, en forma temeraria, que despu&eacute;s del tratamiento con corticoides la arteritis se disemina m&aacute;s y es una causa de muerte, aseveraci&oacute;n que logr&oacute; retrasar el uso de la cortisona en el tratamiento de estas patolog&iacute;as. Dos a&ntilde;os despu&eacute;s de esta afirmaci&oacute;n, Ferguson y Slocumb<sup>17</sup> de la Cl&iacute;nica Mayo, en 1961, analizaron 64 pacientes con vasculitis reumatoide y concluyeron que lo que se requiere es un incremento adecuado de la dosis de esteroides, con una reducci&oacute;n gradual y luego un mantenimiento con la dosis m&iacute;nima requerida. Este art&iacute;culo ofrece una ense&ntilde;anza extraordinaria porque informa, por primera vez, del uso de los glucocorticoides en la vasculitis reumatoide, aplic&aacute;ndose esto muchos a&ntilde;os despu&eacute;s para el manejo racional de estos medicamentos en las vasculitis primarias y secundarias, y en un gran n&uacute;mero de enfermedades diferentes a &eacute;stas.</p>     <p>A pesar del uso de los glucocorticoides, en las d&eacute;cadas de los a&ntilde;os 60 y 70 el mecanismo de acci&oacute;n de estos no se conoc&iacute;a, pero su utilizaci&oacute;n en las vasculitis primarias y secundarias se empez&oacute; a difundir con mayor seguridad. Trabajos como los de Frohnert en 1967, que ratificaba la mejor&iacute;a en la sobrevida de 10% a 48% a cinco a&ntilde;os en poliarteritis nodosa<sup>18</sup>, sirvieron para que otros autores como Barbara Ansell, una de las pioneras de la reumatolog&iacute;a pedi&aacute;trica, empezara a utilizar los glucocorticoides en pacientes pedi&aacute;tricos complicados con artritis, compromiso gastro intestinal y renal en 1970 (ni&ntilde;os con el s&iacute;ndrome de Henoch-Sch&ouml;nlein), as&iacute; como en otras vasculitis espec&iacute;ficas como se mencionara por otros autores.</p>     <p>En la arteritis de Takayasu, entidad informada inicialmente por Sabory<sup>19</sup> en 1856 y Kussmaul en 1872, como la arteritis que compromete la aorta de etiolog&iacute;a desconocida, relacionada posteriormente con el informe de Takayasu, en 1908<sup>20</sup>, de una mujer con manifestaciones oculares, se inicia el uso de corticoides de forma similar a la gran mayor&iacute;a de vasculitis, consider&aacute;ndose como el tratamiento de elecci&oacute;n, con el inicio de altas dosis, a raz&oacute;n de 1 mg/kg/d&iacute;a, por tres meses, alcanzando remisi&oacute;n en aproximadamente 60% de los casos, con posterior disminuci&oacute;n gradual cr&oacute;nica seg&uacute;n la evoluci&oacute;n<sup>21</sup>; aunque con presentaci&oacute;n de varios episodios de reca&iacute;das asociados a la disminuci&oacute;n de la dosis del corticoide<sup>22</sup>. Su uso se encuentra de forma inicial en la publicaci&oacute;n de Nakao en 1967 (<a href="#fig1">Figura 1</a>), en el cual se analiza un grupo de pacientes tratando de reconocer alg&uacute;n factor relacionado con la etiolog&iacute;a de la enfermedad, as&iacute; como estudiando el curso de la enfermedad en 29 pacientes tratados con esteroides, evidenciando un beneficio en m&aacute;s del 50%, a&uacute;n con remisi&oacute;n total de la fase aguda, dado que el tratamiento no continu&oacute; de forma cr&oacute;nica respecto a variables cl&iacute;nicas, angiogr&aacute;ficas y de laboratorio. As&iacute; mismo, inform&oacute; ausencia de mejor&iacute;a de las arteritis en relaci&oacute;n con el tratamiento antituberculoso, infecci&oacute;n que se relacionaba con la enfermedad en esa &eacute;poca<sup>23</sup>. M&aacute;s tarde, Fraga A., en su trabajo demuestra el beneficio del manejo prolongado con esteroides de esta patolog&iacute;a en 12 pacientes, dando base al inicio de estudios al respecto<sup>24</sup>.</p>     <p>    <center><a name="fig1"><img src="img/revistas/rcre/v19n3/v19n3a03f1.jpg"></a></center></p>      <p>La granulomatosis con poliangeitis (granulomatosis de Wegener -GW-), condici&oacute;n descrita y reconocida por la formaci&oacute;n de granulomas necrotizantes y glomerulonefritis, fue tratada desde su inicio con esteroides, con reportes iniciales en los a&ntilde;os 50, principalmente en cuadros cl&iacute;nicos de granulomas necrotizantes de la l&iacute;nea media, por Moore en 1951<sup>25 </sup>y Hagens en 1953<sup>26</sup>. M&aacute;s tarde, tras una mejor caracterizaci&oacute;n de la enfermedad, aparecen los primeros trabajos como el de Beidleman B. en 1963<sup>27</sup>, en los que el uso de esteroides mejora par&aacute;metros inflamatorios de la enfermedad con mayores efectos si &eacute;sta es severa, sin demostrar mejor&iacute;a en la sobrevida a pesar del tratamiento, hecho que degener&oacute; a los corticoides en los a&ntilde;os 60 y 70, cuando se administraban de manera constante como lo menciona Fauci AS. en su art&iacute;culo de revisi&oacute;n en 1978<sup>28</sup>, en el cual dice que exist&iacute;an unas consideraciones especiales para la adici&oacute;n de corticoide a la terapia citot&oacute;xica con ciclofosfamida que se ven&iacute;a desarrollando. Las condiciones mencionadas eran enfermedad renal o pulmonar fulminante, serositis, enfermedad cut&aacute;nea severa y cualquier compromiso ocular; seg&uacute;n publicaciones de &eacute;l mismo, al analizar 18 casos en 1973<sup>29</sup> y 21 casos, en asociaci&oacute;n con Wolf, en 1974<sup>30</sup>.</p>     <p>La enfermedad de Churg Strauss (CS), descrita en 1951 tras el an&aacute;lisis de 13 casos con hipereosinoflia y vasculitis sist&eacute;mica, en pacientes con asma y rinitis, siempre lig&oacute; los esteroides a su tratamiento, pero con informes mas tard&iacute;os que para otras patolog&iacute;as, siendo el m&aacute;s preciso el realizado por Chumbley LC. en 1977<sup>31</sup>, el cual, al recoger una muestra de 30 pacientes, la mayor&iacute;a hombres, demuestra la utilidad de este medicamento en la mejor&iacute;a de la supervivencia. Este art&iacute;culo fue referenciado en repetidas ocasiones en relaci&oacute;n con el inicio de esta terapia en este tipo de vasculitis, lo que no permiti&oacute; que estudios aleatorizados corroboraran este beneficio, el cual es reafirmado m&aacute;s tarde en trabajos como el de Guillevin en 1988 que estudi&oacute; 165 pacientes con PAN y CS<sup>32</sup>.</p> </font>     <p><font size="2" face="verdana">A pesar de toda la evidencia a favor del corticoide en varios tipos de vasculitis, su uso no ha sido igual en la vasculitis crioglobulin&eacute;mica, en la cual el corticoide no ha mostrado un beneficio real para estos pacientes, con una respuesta similar y s&oacute;lo con algo de mejor&iacute;a en los signos inflamatorios como artritis, pero sin modificaci&oacute;n del curso de la enfermedad o cuando existe compromiso neurol&oacute;gico o renal, comparado con el uso solo de interfer&oacute;n gamma. Las observaciones iniciales se dieron en 1980 por Gorevic PD., quien present&oacute; la falta de utilidad para la modifcaci&oacute;n del curso de la enfermedad<sup>33</sup>, dato corroborado, en 1992, por Angelo Vacca, quien encontr&oacute; beneficio en control de artralgias, p&uacute;rpura y disminuci&oacute;n de criocrito, tanto con defazacort como con prednisolona<sup>34</sup>. De igual forma se conoce que la tasa de reca&iacute;das no sufre modifcaci&oacute;n, aunque el tiempo en el cual se produce la primera reca&iacute;da es m&aacute;s prolongado, ocurriendo tres meses despu&eacute;s del uso de la terapia combinada, de corticoides con interfer&oacute;n, como &uacute;nico beneficio<sup>35</sup>.</font></p> <font face="verdana" size="2">    <p>Una de las enfermedades que nos ense&ntilde;a c&oacute;mo fue evolucionando el tratamiento de las vasculitis primarias es la arteritis de c&eacute;lulas gigantes, ya que &eacute;sta es la vasculitis m&aacute;s frecuente y una de las pocas patolog&iacute;as sobre las que existe informaci&oacute;n completa acerca de la evoluci&oacute;n de su tratamiento, como lo describe Gene G. Hunder, profesor em&eacute;rito de la <i>Mayo Clinic College of Medicine </i>en su art&iacute;culo "<i>The early history of giant cell arteritis and Polymialgia Rheumatica: frst descriptions to </i>1970"<sup>36</sup>.</p>     <p>La historia de la arteritis de c&eacute;lulas gigantes inicia con BT. Horton, TB. Magath y GE. Brown, en 1932, quienes describen en la Cl&iacute;nica Mayo la arteritis de los vasos temporales, que Hutchinson<sup>37</sup> inform&oacute; por primera vez en Londres en 1889. En el art&iacute;culo de Horton y Magath<sup>38,39</sup> se describe, en forma anecd&oacute;tica, la utilizaci&oacute;n del yoduro de potasio y peque&ntilde;as dosis de arsfenamina. Meade y cols.<sup>40</sup> en 1950, utilizaron la histamina intravenosa en un paciente con arteritis temporal (AT); Rice-Oxley y Cooke<sup>41</sup> utilizaron la clortetraciclina; Roberts y Askey<sup>42</sup> mejoraban la cefalea al utilizar hidrocloruro de proca&iacute;na en 1948. Un a&ntilde;o despu&eacute;s, en 1949, el grupo investigador de la s&iacute;ntesis de la cortisona, la utiliz&oacute; en pacientes con artritis reumatoide y se analiz&oacute; su uso en otras patolog&iacute;as infamatorias<sup>1,2</sup>.</p>     ]]></body>
<body><![CDATA[<p>Basado en esto, Shick, Baggentoss, Fuller y Polley<sup>5,6</sup> iniciaron la administraci&oacute;n de cortisona y de ACTH en la panarteritis nodosa, en tanto que Tate y Wheeler col.<sup>43</sup> y Kersley en 1951<sup>44</sup> la usaron en la arteritis de c&eacute;lulas gigantes. Seis a&ntilde;os despu&eacute;s de estas &uacute;ltimas publicaciones, el grupo que dirig&iacute;a Schick, conformado por Birkhead y Wagener<sup>45</sup>, estudiaron 55 pacientes con diagn&oacute;stico de arteritis temporal, se les practic&oacute; biopsia a todos, y se administr&oacute; un esquema terap&eacute;utico de acetato de cortisona 300 mg intramuscular seguido de 150 a 200 mg v&iacute;a oral hasta que la sedimentaci&oacute;n globular estuviese normal o casi normal. Despu&eacute;s de la sexta semana se disminuy&oacute; gradualmente, pero algunos pacientes con la reducci&oacute;n de los esteroides presentaron reca&iacute;da, por lo que la terapia se prolong&oacute; hasta por 9 a 12 meses. A tres de estos pacientes se les administr&oacute; prednisolona por v&iacute;a oral a una dosis de 75 mg/d&iacute;a, luego se redujo a 50 mg durante seis semanas y se inici&oacute; su reducci&oacute;n cada tres a cuatro d&iacute;as hasta la suspensi&oacute;n. A este grupo de 55 pacientes en estudio, que podemos decir "controlado", lo compar&oacute; con 53 sujetos de la Cl&iacute;nica Mayo de la &eacute;poca preesteroidea y con 250 pacientes de la literatura que consultaron por disminuci&oacute;n de la agudeza visual y ceguera<sup>45</sup>. Observaron que en los pacientes que utilizaron la cortisona se preven&iacute;a en forma dram&aacute;tica la p&eacute;rdida de la visi&oacute;n, sugiriendo la importancia de &eacute;sta para el tratamiento de la arteritis temporal<sup>45</sup>.</p>     <p>En cuanto a la polimialgia reum&aacute;tica (PR), que se asocia a pacientes con AT, Meulengracht y Schwart<sup>46 </sup>utilizaron terapia f&iacute;sica y radioterapia en 1952; Barber en 1957<sup>47</sup>, Gordon en 1960<sup>48</sup> y Boyle y Beatty en 1961<sup>49</sup> utilizaron los salicilatos. Forestier y Certonciny<sup>50</sup> en 1953, y los investigadores mencionados previamente utilizaron adem&aacute;s, code&iacute;na, fenilbutazona y oxifenbutazona que eran los antiinfamatorios que se utilizaban en esa &eacute;poca. G. Kersley<sup>44</sup> fue el primero en utilizar los glucocorticoides y la ACTH para tratar a tres de 13 pacientes, con una buena respuesta. Barber<sup>47</sup> not&oacute; la efectividad de la cortisona al igual que Gordon<sup>48</sup>, quien trat&oacute; 13 de 21 pacientes con prednisona, utilizando una dosis de 30 a 40 mg/d&iacute;a, por 10 a 21 d&iacute;as, que redujo cada dos a cinco semanas. Con estudios posteriores de Boyle y Beatty, en 1961, se sugiere que se deber&iacute;a iniciar el tratamiento con una dosis m&aacute;s peque&ntilde;a de 15 mg/d&iacute;a. Weissenbach y cols.<sup>51</sup> informaron que la aplicaci&oacute;n del medicamento v&iacute;a intramuscular es efectiva en el tratamiento de la polimialgia reum&aacute;tica, aunque estudios posteriores de Hamrin y cols. en 1964<sup>52</sup>, Alestig y Barr en 1963<sup>53</sup> y Paulley y Hughes en 1960<sup>54</sup>, aconsejaban que cuando los pacientes con polimialgia reum&aacute;tica cursen con arteritis de c&eacute;lulas gigantes, la dosis de esteroides deber&iacute;a ser mayor. En 1971, Hamilton, Shelley y Tumulty<sup>55</sup>, en su art&iacute;culo cl&aacute;sico de la revista <i>Medicine</i>, describen y confirman las observaciones anteriores sobre la respuesta dram&aacute;tica a los corticoides de los pacientes con arteritis temporal y polimialgia reum&aacute;tica. Todas las investigaciones anteriores relacionadas con AT y PR nos ense&ntilde;aron c&oacute;mo deber&iacute;a ser el uso de los glucocorticoides para tratar las vasculitis primarias.</p>     <p>Reconocida la importancia del uso de los corticoides en esta patolog&iacute;a, ensayos ulteriores como los de Aiello y Trautmann en 1993, encontraron el beneficio para prevenir la ceguera, reduci&eacute;ndola a menos del 1%<sup>56</sup> y la importancia del uso de altas dosis de esteroide en los casos severos<sup>57</sup>, con requerimientos posteriores de corticoide a largo plazo, dado la alta frecuencia de reca&iacute;das tras su suspensi&oacute;n (entre 40 y 50%) como lo demostr&oacute; Salvarani y Macchioni en su seguimiento de pacientes a cinco a&ntilde;os en 1987<sup>58</sup>, con una alta frecuencia tambi&eacute;n de eventos adversos, sin reconocer, hasta el momento, criterios para definir la duraci&oacute;n de la terapia<sup>59</sup>.</p>     <p>Cuatro art&iacute;culos, en nuestro criterio, fueron de una gran trascendencia para el uso racional de los gluco-corticoides en los pacientes con vasculitis primaria y secundaria y, por ende, su uso en el tratamiento de las enfermedades reumatol&oacute;gicas y de otras especialidades. En su orden de publicaci&oacute;n fueron los informes de Ferguson y Slocumb en 1961<sup>17</sup>, Torn en 1966<sup>60</sup>, Axelrod en 1976<sup>61</sup> y el de Fauci, Dale y Ballow en 1976<sup>62</sup>. Al analizar estas publicaciones, los glucocorticoides deben utilizarse cuando exista una indicaci&oacute;n cl&iacute;nica para su uso: 1) en todos aquellos casos que la vida del paciente est&eacute; en peligro, 2) compromiso de &oacute;rganos vitales como: cerebro, pulm&oacute;n, ri&ntilde;ones, coraz&oacute;n, tracto gastrointestinal, lesiones extensas de piel, 3) cuando se documente mononeuritis m&uacute;ltiple y polineuropat&iacute;a, 4) s&iacute;ndrome de pulm&oacute;n-ri&ntilde;&oacute;n, 5) glomerulonefritis proliferativas y segmentarias, 6) cuando existe evidencia de laboratorio y cl&iacute;nica de compromiso sist&eacute;mico, como la presencia de s&iacute;ntomas constitucionales dados por p&eacute;rdida de peso, fiebre, mialgias, artralgias, elevaci&oacute;n de los reactantes de fase aguda, trombocitosis, 7) ante la sospecha de una vasculitis severa cuando el tratamiento debe iniciarse en forma temprana, con el apoyo del m&eacute;dico reumat&oacute;logo o el experto en vasculitis, y la ayuda de los aspectos cl&iacute;nicos y de laboratorio. Con estos puntos considerados, la inducci&oacute;n del tratamiento se debe realizar con una dosis de 1 mg/kg de peso, siempre utilizarlo en dosis divididas de acuerdo con la gravedad de la enfermedad y del &oacute;rgano blanco comprometido<sup>13,60,62</sup>.</p>     <p>En uno de los primeros libros sobre vasculitis primaria, titulado "<i>In the vasculitis major problems in internal medicine</i>", publicado en 1982, T Cupps y Anthony Fauci<sup>63</sup>, afrmaron que los glucocorticoides se han utilizado en el tratamiento de las vasculitis y constituyen la piedra angular de la terap&eacute;utica en estas patolog&iacute;as.</p>     <p><font size="3"><b>Pulsos de metilprednisolona</b></font></p>     <p>En las d&eacute;cadas de 1950 y 1960 el uso de los glucocorticoides para tratar a los pacientes con PAN y GW era lo &uacute;nico establecido para suprimir la actividad infamatoria, pero el mantenimiento de dosis altas generaba una serie de eventos adversos muy conocidos para esa &eacute;poca. El uso de los glucocorticoides para tratar estas vasculitis era emp&iacute;rico, ya que no se conoc&iacute;a la etiolog&iacute;a y la patog&eacute;nesis de las vasculitis, pero en 1958 los investigadores Frank Dixon, V&aacute;squez, Weigle y Cochrane<sup>64</sup> estudiaron en forma experimental en modelos animales la enfermedad del suero, en la que se demuestra la presencia de arteritis y de complejos inmunitarios en las paredes de los vasos, igual conclusi&oacute;n fue planteada m&aacute;s tarde por Sokolof, en 1953<sup>65</sup>, para artritis reumatoide y lupus. Gocke y cols.<sup>66 </sup>demostraron el ant&iacute;geno australiano y los complejos ant&iacute;geno-anticuerpo en la sangre y los asociaron a la patog&eacute;nesis de la arteritis sin demostrarse &eacute;stos en la lesi&oacute;n arter&iacute;tica, aunque Howell y Epstein<sup>67</sup> s&iacute; lograron demostrar la presencia de complejos inmunitarios en la GW. Adem&aacute;s de los estudios sobre patog&eacute;nesis de las vasculitis, Yu y cols.<sup>68</sup>, en 1974, estudiaron los efectos de los glucocorticoides en los linfocitos T y B. Butler y Rosen, en 1973<sup>69</sup>, observaron c&oacute;mo una dosis alta por v&iacute;a oral de metilprednisolona en cursos breves produce una ca&iacute;da de los niveles de IgG, un incremento de su catabolismo y s&iacute;ntesis; describieron tambi&eacute;n que los granulomas mejoraban r&aacute;pidamente con la metilprednisolona a dosis altas por v&iacute;a endovenosa m&aacute;s que por la v&iacute;a oral. Estos estudios de la utilizaci&oacute;n de dosis altas de metilprednisolona en pacientes para el rechazo del trasplante renal y la nefropat&iacute;a l&uacute;pica, permitieron la posibilidad de su uso en vasculitis primarias severas.</p>     <p>Con estos antecedentes, para explicar la patog&eacute;nesis de las vasculitis y los eventos adversos de los glucocorticoides, Bell y cols.<sup>70</sup> en 1971 y Feduska y cols.<sup>71</sup> en 1972, demostraron el beneficio de las dosis altas de glucocorticoides a 30 mg/kg, denominadas pulsos, en el rechazo de los pacientes con trasplante renal. Cathcart y cols.<sup>72</sup> en 1976, utilizaron los pulsos de metilprednisolona para tratar la glomerulonefritis proliferativa difusa con r&aacute;pido deterioro de la funci&oacute;n renal en pacientes con lupus y notaron la mejor&iacute;a no s&oacute;lo cl&iacute;nica sino de los tejidos renales. Con los estudios mencionados anteriormente, G.H Neild y H.A. Lee<sup>73</sup> del <i>Wessex Regional Renal Unit </i>y del <i>St Mary Portsmouth </i>en el Reino Unido, utilizaron, en 1977, los pulsos de metilprednisolona para tratar dos pacientes con PAN y semilunas en tejido renal con dosis de 30 mg/kg por cuatro, con intervalos de 48 horas, describiendo mejor&iacute;a del compromiso renal, de los s&iacute;ntomas y menos eventos adversos. Con base en esto, la demostraci&oacute;n de la mejor&iacute;a de los pacientes con enfermedad severa y control r&aacute;pido del proceso infamatorio, adem&aacute;s del inicio del uso de pulsos de corticoide desde los trabajos descritos en PAN en 1977, se extendi&oacute; su uso a otras patolog&iacute;as que de forma usual son severas con compromiso de &oacute;rganos que amenazan la vida del paciente, como la granulomatosis con poliangeitis y en general a todas las vasculitis con anticuerpos ANCA positivos as&iacute; como en arteritis de Takayasu.</p>     <p>Lo anterior, sumado a la confusi&oacute;n de criterios diagn&oacute;sticos para diferenciar la variedad de formas de vasculitis primarias de peque&ntilde;o vaso y poliarteritis nodosa, no ha permitido contar con ensayos cl&iacute;nicos que comparen dosis o diferentes esquemas de esteroides, tanto as&iacute; que a pesar de ser los pulsos, la terapia a largo plazo con corticoides, parte primordial en el tratamiento, las gu&iacute;as la encuentran con un nivel de evidencia 3 y grado de recomendaci&oacute;n C en los tiempos actuales<sup>74</sup>.</p>     <p>En la GW se extendi&oacute; su uso luego del inicio del tratamiento de PAN con pulsos de esteroide, principalmente en el compromiso renal, el cual es causa frecuente de mortalidad en estos pacientes. Esto se bas&oacute; en trabajos como los de Bolton y Couser en 1979<sup>75</sup>, en los cuales no hacen distinci&oacute;n de la causa de la glomerulonefritis r&aacute;pidamente progresiva con informes posteriores como los de Harrison HL y col. en 1980, que analizaron la utilidad de pulsos de esteroides junto con citot&oacute;xicos como terapia inicial<sup>76</sup>. Ya en 1986, con la publicaci&oacute;n de Leavitt RY y col.<sup>77</sup> que demostr&oacute; la respuesta a los pulsos en estos pacientes, que tambi&eacute;n presentan formas pulmonares severas, permiti&oacute; la extrapolaci&oacute;n de la terapia de altas dosis de esteroides para el manejo de otro tipo de vasculitis con compromiso pulmonar frecuente como la granulomatosis con poliangeitis eosinof&iacute;lica (Churg Strauss). En 1987 aparece la primera publicaci&oacute;n, MacFadyen R<sup>78</sup>, respecto de su utilidad, con el informe de un caso en un paciente en quien se utiliz&oacute; prednisolona 100 mg oral previamente y que, por no mejor&iacute;a, se le administr&oacute; 1 gramo de metilprednisolona por cuatro d&iacute;as.</p>     ]]></body>
<body><![CDATA[<p>Como se ha visto en esta revisi&oacute;n, los glucocorticoides, a pesar de no ser probados en grandes ensayos cl&iacute;nicos, son, sin duda, el medicamento de elecci&oacute;n para casi todas las variedades de vasculitis y el uso de los pulsos de corticoide en las formas severas. Caso similar se evidencia en la arteritis de c&eacute;lulas gigantes, donde se requieren altas dosis iniciales de 0.5 g para los cuadros de isquemia severa o alteraciones visuales<sup>79,80</sup>. No obstante, estudios observacionales realizados m&aacute;s tarde, como los de Chevalet P en el 2000<sup>81</sup>, Liu en 2001<sup>82</sup>, Foroozam en 2003<sup>83</sup> y Hayreh en el 2003<sup>84</sup>, no encontraron beneficio; dicha evidencia fue refutada despu&eacute;s con el &uacute;nico ensayo cl&iacute;nico al respecto realizado por Mazlumzadeh en 2006<sup>85</sup>, en el cual 27 pacientes fueron aleatorizados a recibir metilprednisolona 15 mg/kg/dosis, por tres d&iacute;as o placebo, encontrando beneficio en el control de la enfermedad, reducci&oacute;n de dosis de corticoide, a pesar que se excluyeron pacientes con complicaciones oculares severas agudas, quienes al parecer obtienen mayor beneficio.</p>     <p><font size="3"><b>Ciclofosfamida</b></font></p>     <p>Los medicamentos inmunosupresores se conocen tambi&eacute;n como medicamentos citot&oacute;xicos y antimetabolitos; fueron introducidos como agentes quimioterap&eacute;uticos para el tratamiento del c&aacute;ncer como un derivado de la mostaza nitrogenada. Es un agente alquilante que act&uacute;a en todas las fases del ciclo celular y su acci&oacute;n es mayor en los linfocitos T que en los B<sup>86</sup>.</p>     <p>La Escuela Espa&ntilde;ola de Medicina Interna, dirigida por uno de los grandes investigadores como Jim&eacute;nez-D&iacute;az<sup>86</sup>, public&oacute;, por primera vez, en 1951, en la revista <i>Jama</i>, la utilizaci&oacute;n de la mostaza nitrogenada para el tratamiento de la artritis reumatoide, junto con la observaci&oacute;n de Chasis, Goldring y Baldwin<sup>87</sup> en 1951, al utilizar metil-bis (B-cloroetil), amino hidrocloruro de mecloetamina o mostaza nitrogenada o Mustargen&reg;, producto elaborado por Merck Sharp &amp; Dohme, para el tratamiento de la glomerulonefritis y del s&iacute;ndrome nefr&oacute;tico. Posteriormente, se realizaron otros estudios para tratar la nefropat&iacute;a l&uacute;pica por Dustan, Corcoran y Haserick<sup>88</sup>, en 1951, y en 1954 Edmund Dubois<sup>89 </sup>utiliz&oacute; la mostaza nitrogenada para la primera serie de 25 pacientes con nefritis l&uacute;pica. La ciclofosfamida, como nuevo compuesto sintetizado, fue utilizada, por primera vez en reumatolog&iacute;a, por Moncrief y cols.<sup>90</sup>, en 1969, al tratar 46 ni&ntilde;os con s&iacute;ndrome nefr&oacute;tico. Despu&eacute;s el tratamiento de la nefritis l&uacute;pica fue uno de los objetivos del Instituto Nacional de Salud de Estados Unidos, NIH (por sus siglas en ingl&eacute;s), desde 1969, siendo en 1971 cuando aparece el primer art&iacute;culo de Steinberg al respecto<sup>91,92,93,94</sup> por lo que fue a partir de esta &eacute;poca que empez&oacute; a utilizarse la ciclofosfamida en nefritis l&uacute;pica en Chicago, Nueva York e Inglaterra, y se iniciaron los primeros protocolos en reumatolog&iacute;a.</p>     <p>La PAN (panarteritis nodosa), primera patolog&iacute;a relacionada con el grupo de vasculitis, como se ha mencionado, ten&iacute;a alta mortalidad, llegando a casi el 100% en casos severos sin tratamiento y con leve mejor&iacute;a tras al inicio del uso de corticoides<sup>18</sup>, lo cual hac&iacute;a prioritaria la inclusi&oacute;n adjunta de otra terap&eacute;utica y es as&iacute; como descripciones de casos entre 1971 y 1976<sup>95,96,97</sup>, sumados a la experiencia adquirida en G W, de la cual se hablar&aacute; m&aacute;s adelante, permitieron el inicio de agentes alquilantes y ciclofosfamida, siendo este &uacute;ltimo el &uacute;nico citot&oacute;xico aprobado y que ha demostrado su beneficio, hasta el d&iacute;a de hoy para esta enfermedad, aunque sin prolongaci&oacute;n de la sobrevida en estos pacientes<sup>98,99</sup>.</p>     <p>Basados en trabajos de Walton<sup>100</sup>, quien analiz&oacute; una cohorte hist&oacute;rica de pacientes con granulomatosis con poliangeitis , en 1958 observ&oacute; que el pron&oacute;stico en estos pacientes con GW para esa &eacute;poca era muy pobre con el uso de los corticoides solamente, y sobre todo cuando los pacientes ten&iacute;an compromiso renal, siendo la enfermedad fatal en los siguientes cinco meses con s&oacute;lo el 4% de sobrevida a los dos a&ntilde;os. Otros informes, como los de Sandler y McGregor<sup>101 </sup>en 1963, indicaban que los glucocorticoides, a pesar de ser formalmente los primeros y por largo tiempo los &uacute;nicos medicamentos en la d&eacute;cada de los 50 para tratar las vasculitis como la PAN y la GW, no eran &uacute;tiles; Beidelman en 1963<sup>27</sup>, Fred y cols. en 1964<sup>102 </sup>y Grahne y Zecher en 1966<sup>103</sup>, sostuvieron que eran parcialmente &uacute;tiles.</p>     <p>En 1954 se produjeron los primeros informes del uso de agentes citot&oacute;xicos con mostaza nitrogenada en el tratamiento de la GW por Fahey J<sup>104</sup>, Greenspan en 1965<sup>105</sup> con ciclofosfamida en granuloma letal de la l&iacute;nea media y Mcilvanie SK en 1966<sup>106</sup> con el uso de clorambucil, siendo en 1967 Hollander y Manning<sup>107 </sup>quienes trataran 26 casos, bien documentados de GW en la literatura americana, con glucocorticoides como agente terap&eacute;utico esencial pero en asociaci&oacute;n de alquilantes. Ellos encontraron una sobrevida de 12.5 meses comparados con los pacientes no tratados informados por Walton<sup>100</sup> en 1958, cuya sobrevida era, en promedio, de cinco meses. Los glucocorticoides mejoraban la reacci&oacute;n infamatoria temprana y los s&iacute;ntomas, pero no ten&iacute;an una respuesta adecuada en ri&ntilde;&oacute;n y en pulm&oacute;n, y en la presentaci&oacute;n de eventos adversos indeseables frecuentes, como lo describ&iacute;a Raitt<sup>108</sup> en 1971, hecho que concluy&oacute; en que la terapia basada con corticoide y no en agentes alquilantes deb&iacute;a reevaluarse.</p>     <p>M&aacute;s tarde, como se menciona en el apartado de esteroides, los autores Fauci y Wolf<sup>29,30</sup>, en 1973 y 1974, informaron, en un n&uacute;mero mayor de pacientes, la ventaja de usar agentes alquilantes como ciclofosfamida en el manejo de pacientes con GW, usando unas dosis de 1 a 2 mg/kg y seg&uacute;n respuesta y monitoreo de c&eacute;lulas blancas, aumento de dosis de 25 mg/d&iacute;a o ciclos cortos de esteroides, con un tiempo de tratamiento no definido hasta de 60 meses en algunos pacientes (<a href="#fig2">Figura 2</a>). Anthony Fauci entra, entonces, al NIH donde se comienza a emplear este esquema terap&eacute;utico descrito, referenciado desde entonces como protocolo de Fauci o el NIH-standard en m&uacute;ltiples publicaciones.</p>     <p>    <center><a name="fig2"><img src="img/revistas/rcre/v19n3/v19n3a03f2.jpg"></a></center></p>      ]]></body>
<body><![CDATA[<p>En 1978 Fauci y cols. informaron la excelente respuesta de dos pacientes con PAN con aneurismas abdominales, quienes fueron tratados con ciclofosfamida oral a raz&oacute;n de 1-2 mg/kg/d&iacute;a m&aacute;s prednisona interdiaria, con remisi&oacute;n a las pocas semanas y desaparici&oacute;n de los aneurismas un a&ntilde;o despu&eacute;s<sup>109</sup> (<a href="#fig3">Figura 3</a>). En un art&iacute;culo en 1983, Fauci<sup>110</sup> inform&oacute; que con base en un estudio de 85 pacientes confrmaba la utilidad del r&eacute;gimen terap&eacute;utico, renov&oacute; la importancia del uso de los corticoides de forma cr&oacute;nica y continua, acompa&ntilde;ados de ciclofosfamida en todos los pacientes, evidenciando la aplicabilidad de este medicamento por encima de otras alternativas como azatioprina y clorambucilo, que no hab&iacute;an demostrado ser mejores, fgurando este protocolo en referencias hasta la actualidad<sup>111</sup>.</p>     <p>    <center><a name="fig3"><img src="img/revistas/rcre/v19n3/v19n3a03f3.jpg"></a></center></p>      <p>En la d&eacute;cada de los 90 ocurren fen&oacute;menos importantes: la clasificaci&oacute;n del consenso de Chapell Hill en 1994<sup>112</sup> y la agrupaci&oacute;n de varias formas de vasculitis en ANCA positivas. Como resultado de esto se empezaron a generar gu&iacute;as y preguntas nuevas.</p>     <p>La toxicidad de la ciclofosfamida y, por tanto, frecuente aparici&oacute;n de eventos adversos permiti&oacute;, en forma m&aacute;s exhaustiva, tratar de buscar su reemplazo. Surgieron varios famosos estudios al respecto; el estudio NORAM<sup>113</sup> en 2005, compar&oacute; metotrexate con ciclofosfamida como inductor de remisi&oacute;n siendo el primero &uacute;til en casos no severos pero no en compromiso renal o pulmonar; el estudio CYCAZAREM<sup>114</sup>, en 2003, compar&oacute; la ciclofosfamida con azatioprina para mantenimiento, los encontr&oacute; iguales en cuanto a la ocurrencia de reca&iacute;das siendo la azatioprina menos t&oacute;xica, y otros estudios menores que compararon micofenolato mofetil con ciclofosfamida, mostr&aacute;ndose mejor la primera en alcanzar la remisi&oacute;n pero con la necesidad de estudios adicionales<sup>115,116</sup>. Con el inicio de la era de medicamentos biol&oacute;gicos el estudio RAVE-INT evidenci&oacute; la no inferioridad del rituximab en comparaci&oacute;n con ciclofosfamida para la inducci&oacute;n y una posible ventaja en los pacientes refractarios.</p>     <p>En la vasculitis eosinof&iacute;lica de CS los informes del uso de agentes alquilantes son m&aacute;s rezagados si tenemos en cuenta que informes de casos como el de Fauci A. en 1979<sup>117</sup> en vasculitis severa y Gintaras E. en 1980<sup>118</sup> s&oacute;lo mencionan esta terapia como alternativa en GW, encontrando s&oacute;lo hasta 1986, por Leavitt RY<sup>77</sup>, las primeras referencias en esta patolog&iacute;a espec&iacute;fcamente. En 1991, conformado el <i>French Vasculitis Study Group</i>, se realizan los primeros ensayos cl&iacute;nicos que comparaban la terapia combinada de esteroide m&aacute;s ciclofosfamida con plasmaf&eacute;resis, con resultados muy importantes que ratifcaban lo provechosa, en t&eacute;rminos de respuesta y disminuci&oacute;n de reca&iacute;das, la dosis de 2 mg/kg/d&iacute;a, dejando sin campo de acci&oacute;n la plasmaf&eacute;resis que no demostr&oacute; ninguna utilidad2<sup>7,98-108,110-114,116-119</sup>. De los mismos autores M. Gayraud, L Guillevin P. , del grupo franc&eacute;s, surgieron en los a&ntilde;os 94<sup>120</sup> y 96<sup>121</sup> otros dos estudios que, por primera vez, comparaban en forma directa, dosis y v&iacute;as de administraci&oacute;n de ciclofosfamida en CS y PAN de buen pron&oacute;stico, con pulsos de 0,6 g/m<sup>2</sup> de superficie corporal mensual, por 12 meses, sin hallar diferencias con la dosis oral usual y la ineficacia de la plasmaf&eacute;resis aun en pacientes con factores de mal pron&oacute;stico.</p>     <p>Contrario a lo anterior, otras formas de vasculitis con compromiso de grandes vasos han tenido escasa evidencia del uso de la ciclofosfamida, encontrando datos s&oacute;lo en arteritis de Takayasu. Debido a que la frecuencia de respuesta a los esteroides as&iacute; como para otras vasculitis era parcial, con informes de 20% por Lupi<sup>21</sup> y 60% por Nakao<sup>23</sup>, se public&oacute; en 1985 un &uacute;nico ensayo en la literatura del uso de citot&oacute;xicos, en siete pacientes sin adecuada respuesta de un grupo de 16, con dosis de 2 mg/kg/d&iacute;a basados en los esquemas propuestos para GW y PAN, con adecuada respuesta<sup>122</sup>.</p>     <p><font size="3">Pulsos de ciclofosfamida</font></p>     <p>Uno de los planteamientos para utilizar los intravenosos (IV) de ciclofosfamida, sustituyendo la v&iacute;a oral en pacientes con enfermedad sist&eacute;mica severa y progresiva como vasculitis, la nefropat&iacute;a proliferativa difusa y otras enfermedades del tejido conjuntivo, era que la respuesta por v&iacute;a oral se present&oacute; al d&eacute;cimo d&iacute;a, lo que para una enfermedad activa severa era catastr&oacute;fico. Este hecho llev&oacute; a que el NIH planteara la idea de utilizar los pulsos de ciclofosfamida para el tratamiento de la nefritis proliferativa difusa inicialmente.</p>     <p>Observaciones en las cl&iacute;nicas de lupus y de vasculitis del hospital <i>St Tomas </i>en Londres, dirigido por Graham Huges, determinaron que la administraci&oacute;n por pulsos IV de ciclofosfamida ten&iacute;an los mismos beneficios, menos eventos adversos y se pod&iacute;an administrar en forma ambulatoria. Este grupo empez&oacute; a utilizar 500 mg por pulsos intravenosos cada tres semanas. Con trabajos ulteriores como el de Houssiau y cols.<sup>123</sup> en 1991, con dosis de 500 mg, en periodos cortos, en pacientes con nefritis l&uacute;pica, se origin&oacute; el concepto del EuroLupus. Un a&ntilde;o despu&eacute;s el mismo grupo comienza a utilizar los pulsos, no s&oacute;lo en la nefropat&iacute;a l&uacute;pica sino en las enfermedades graves del tejido conjuntivo y en 16 casos de vasculitis sist&eacute;mica como GW y PAN, con posibles informes previos que hacen referencia a pulsos pero que no usan dosis altas (100 a 200 mg) del medicamento, como lo conocemos en la actualidad y como se us&oacute; en la nefritis l&uacute;pica.</p>     ]]></body>
<body><![CDATA[<p>Siendo la vasculitis un grupo de patolog&iacute;as con compromiso ocasionalmente fulminante, tard&iacute;o a la implementaci&oacute;n de terapia con ciclofosfamida, se inici&oacute; su uso en pulsos a dosis moderadas, como Fauci A. describe en su revisi&oacute;n de 1978<sup>28</sup>, dividiendo los pacientes en presentaciones cl&iacute;nicas severas que requieren dosis de 4 mg/kg/d&iacute;a, por tres a cuatro d&iacute;as, encontrando que la implementaci&oacute;n de estas dosis de tratamiento se vieron &iacute;ntimamente ligadas a la necesidad de mejorar el curso cl&iacute;nico de los pacientes con compromiso renal severo y, espec&iacute;fcamente, con glomerulonefritis r&aacute;pidamente progresiva<sup>124</sup> u ocasionalmente compromiso pulmonar, igualmente importante.</p>     <p>Luego, en 1979, se publica el uso de ciclofosfamida en vasculitis severa, indistintamente del diagn&oacute;stico espec&iacute;fco<sup>125</sup>, donde aclaran la inclusi&oacute;n de PAN y CS, base para futuras publicaciones de estudios no aleatorizados con r&eacute;gimen terap&eacute;utico en varias dosis altas, con pulsos de 4 a 5 mg/kg/dosis, como las de Fauci y Haynes en el an&aacute;lisis de 85 casos en 1983<sup>110</sup>, de Leavitt RY. en 1986<sup>77</sup> en vasculitis pulmonar, Chung Chow en 1989 espec&iacute;fcamente en un caso de CS con dosis de 750 mg/m2/dosis<sup>126</sup>, Falk en 1990<sup>127</sup> con 70 pacientes con GW y PAN a dosis de 0,5 gr/m2 superficie corporal (sc), Reinhold-Keller en 1994 con 43 diagnosticados con GW y dosis de 0,66 gr/m2sc<sup>128</sup>, Nachman en 1996<sup>129</sup> con 124 casos incluyendo 78 poliange&iacute;tis microsc&oacute;picas, Mart&iacute;n-Su&aacute;rez<sup>130</sup> y Boki<sup>131 </sup>en 1997 con 156 casos incluyendo 30 pacientes con PAN y 10 con CS y dosis de 0,5 g al mes, y por &uacute;ltimo Adu<sup>132</sup>, Guillevin<sup>133</sup> en 1997 y Haubitz en 1998<sup>134</sup>.</p>     <p>La poliange&iacute;tis microsc&oacute;pica (PAM) as&iacute; como las dos anteriores, hace parte de las llamadas vasculitis con anticuerpos anticitoplasma de neutr&oacute;flos (ANCA) frecuentemente positivos. Inicialmente fue descrita como la forma microsc&oacute;pica de la poliarteritis nodosa en 1923 por Wohlwill, caracterizada por el compromiso renal con histolog&iacute;a que mostraba glomerulonefritis necrotizante<sup>135</sup>. Dado que en esta entidad se describ&iacute;an como s&iacute;ndrome de sobre posici&oacute;n de poliange&iacute;tis y que no se incluy&oacute; en el estudio de criterios diagn&oacute;sticos del <i>American College of Rheumatology, </i>ACR, en 1990, la historia del tratamiento de la PAM se limita hasta su descripci&oacute;n separada de PAN en el consenso de Chapel Hill en 1994<sup>112</sup>, luego del reconocimiento previo de la presencia de anticuerpos ANCA asociados<sup>136</sup>. Para esos momentos se agruparon las vasculitis ANCA positivas, de tal forma que se presenta un esquema terap&eacute;utico com&uacute;n en tres fases, siendo &eacute;stas: la inducci&oacute;n, mantenimiento y seguimiento a largo plazo. Conociendo que los bolos de ciclofosfamida hab&iacute;an sido ya usados en GW, CS y en PAN con compromiso renal microsc&oacute;pico que posiblemente correspond&iacute;a a PAM, esto impuls&oacute; la continuaci&oacute;n de los mismos esquemas de tratamiento, sin poner en duda su beneficio<sup>137,138</sup>.</p>     <p>En estos primeros protocolos en los cuales se trataron de unifcar las terapias, la ciclofosfamida era parte primordial del tratamiento en las dos primeras fases, y los pulsos como parte esencial en pacientes con compromiso sist&eacute;mico o renal severos. En la fase de inducci&oacute;n, sin embargo, el uso de pulsos endovenosos de ciclofosfamida en comparaci&oacute;n con terapia oral no hab&iacute;a mostrado diferencia en ausencia de ensayos cl&iacute;nicos hasta el momento, como lo escribe Falk RJ. en 1990<sup>127</sup>, en una serie de 70 casos que inclu&iacute;an GW y PAN, la buena respuesta a esta terapia se logr&oacute; resolver cuando se empezaron a hacer los estudios controlados que se llevaron a cabo en el 2009. El estudio CYCLOPS por el grupo <i>European Vasculitis Study Group</i>, uno de los ensayos cl&iacute;nicos m&aacute;s grandes que inclu&iacute;a pacientes con GW, PAM y vasculitis limitada al ri&ntilde;&oacute;n, reafrm&oacute; la utilidad para remisi&oacute;n en cualquiera de los dos reg&iacute;menes, sea oral o en pulsos endovenosos de ciclofosfamida, pero con menor toxicidad en pacientes que usaban los pulsos<sup>139,140</sup>.</p>     <p><font size="3"><b>Metotrexate</b></font></p>     <p>Esta mol&eacute;cula se empez&oacute; a utilizar en reumatolog&iacute;a para tratar la artritis reumatoide y la psoriasis en 1951 por Gubner y cols.<sup>125</sup> Seis a&ntilde;os despu&eacute;s, en 1957, Allison y Bettley<sup>141</sup> utilizaron el metotrexate para tratar una &uacute;lcera cr&oacute;nica y luego, en 1986, Luis Espinoza y cols.<sup>142</sup> lo utiliz&oacute;, a una dosis de 20 mg/semana, para tratar a ocho pacientes con &uacute;lceras cr&oacute;nicas asociadas a vasculitis reumatoide, durante 12 semanas, con mejor&iacute;a de las lesiones. Los primeros que utilizaron el metotrexate en el tratamiento de vasculitis primaria fueron Capizzi y Bertimo de la universidad de Yale<sup>143 </sup>en 1971, en asociaci&oacute;n a los glucocorticoides en dos pacientes con granulomatosis con poliangeitis , uno de &eacute;stos, adem&aacute;s, con azatioprina.</p>     <p>En M&eacute;xico, Antonio Fraga, Mintz y Orozco<sup>144</sup> en 1974, utilizaron el metotrexate por v&iacute;a intravenosa, durante 18 meses, para tratar dos pacientes con poliarteritis PAN, con mejor&iacute;a de su cuadro cl&iacute;nico. Observaron que despu&eacute;s de los 14 meses de tratamiento no se encontraban aneurismas pero s&iacute; infarto cortical renal y cambios vasculares hipertensivos. Seis a&ntilde;os despu&eacute;s, Hyman Tannenbaum<sup>145</sup> combina la terapia de glucocorticoides con metotrexate 25 mg IV para tratar un paciente de 38 a&ntilde;os con panarteritis PAN, con una dosis total acumulada de 465 mg del medicamento, con mejor&iacute;a de su cuadro cl&iacute;nico. Escasa literatura se encuentra posterior a esta descripci&oacute;n<sup>99,146,</sup> limit&aacute;ndose a formas cut&aacute;neas sin compromiso sist&eacute;mico<sup>147,148</sup>, lo que refeja la utilidad del metotrexate en estas patolog&iacute;as, sin ser tenido en cuenta como recomendaci&oacute;n en las gu&iacute;as actuales<sup>74</sup>.</p>     <p>A partir de la d&eacute;cada de 1980 y al inicio de la d&eacute;cada de 1990 se increment&oacute; el n&uacute;mero de informes de pacientes tratados con metotrexate por v&iacute;a oral, pero en casos no severos; con el tiempo se conoci&oacute; mejor su mecanismo de acci&oacute;n, al disminuir el n&uacute;mero y funci&oacute;n de los linfocitos B, alterando la quimiotaxis y la adhesi&oacute;n de los neutr&oacute;flos a las c&eacute;lulas endoteliales. En 1992, Hofman y cols.<sup>149</sup>, y en 1995 Sneller del grupo de Anthony Fauci<sup>150</sup>, en pacientes con ange&iacute;tis granulomatosa, utilizaron en forma prospectiva metotrexate a una dosis de 0.3 mg/kg de peso, inicialmente 15 mg/semana que se pod&iacute;a incrementar hasta 20 y 25 mg/semana, en combinaci&oacute;n con glucocorticoides. Se observ&oacute; una remisi&oacute;n en el 71%, aunque un 40% de los sujetos present&oacute; reca&iacute;das posiblemente debido a que los corticoides se hab&iacute;an descontinuado, y la aparici&oacute;n en el 5% de los pacientes de neumonitis asociada a metotrexate. Lo importante es que con estos trabajos se logr&oacute; demostrar que el metotrexate puede ser una terapia alterna para tratar a los pacientes con GW como inducci&oacute;n.</p>     <p>En las publicaciones posteriores de Groot en 1998<sup>151</sup> y Stone en 1999<sup>152</sup> se mencionaba que si &eacute;sta podr&iacute;a llegar a ser la terapia de elecci&oacute;n en algunos pacientes por encima de los otros medicamentos, especialmente de la ciclofosfamida. La respuesta a esta pregunta fue resuelta seis a&ntilde;os m&aacute;s tarde con el estudio NORAM<sup>113</sup>, como se mencion&oacute; previamente, en el cual el metotrexate mostr&oacute; su utilidad en relaci&oacute;n con la mejor terapia hasta el momento, la ciclofosfamida, en casos no severos o sist&eacute;micos incluyendo pacientes con GW y escasos con PAM, agrupados como vasculitis ANCA positivas. Teniendo esto en cuenta, la literatura es escasa en PAM, relegada a la agrupaci&oacute;n con otras patolog&iacute;as, con algunos casos en los estudios tanto en terapia de inducci&oacute;n como de mantenimiento ya descritos.</p>     <p>En otro tipo de vasculitis, en el s&iacute;ndrome de CS ocurre lo mismo, encontr&aacute;ndose una sola referencia respecto al tratamiento de inducci&oacute;n con metotrexate, por Metzler en 2004, con 11 pacientes sin enfermedad severa o compromiso de &oacute;rgano vital<sup>153</sup>, en &eacute;ste se concluye que la terapia de inducci&oacute;n con metotrexate es efectiva, con remisi&oacute;n del 72%. Para el mantenimiento tampoco se cuenta con estudios o referencias diferentes a la previa donde el uso de este medicamento parece ser limitado.</p>     ]]></body>
<body><![CDATA[<p>Se iniciaron nuevos trabajos en el NIH, con motivo de evitar los efectos t&oacute;xicos de la ciclofosfamida por v&iacute;a oral como mantenimiento, despu&eacute;s de una inducci&oacute;n con ciclofosfamida y glucocorticoides, pretendiendo reemplazar este medicamento. En el trabajo de Sneller y cols. en 1995<sup>150</sup>, los pacientes recibieron un r&eacute;gimen de tratamiento con corticoides pero asociado a una dosis oral de metotrexate (20-25 mg/semanal en cambio de ciclofosfamida), que se continu&oacute; por 1-2 a&ntilde;os despu&eacute;s de la remisi&oacute;n. De los 42 pacientes, 33 (79%) entraron en remisi&oacute;n y fue inefectivo en tres pacientes. Diecinueve pacientes recidivaron a los 29 meses despu&eacute;s de suspender el metotrexate y cuando se les hab&iacute;a reducido la dosis a 15 mg/semana. Los pacientes con enfermedad pulmonar severa o que tuvieran una creatinina mayor de 2.5 mg/dl se excluyeron del protocolo.</p>     <p>Los estudios de Hofman y cols.<sup>149</sup>, en 1992, Sneller y cols., en 1995<sup>150</sup> y Langford y cols., en 1997<sup>154</sup>, demostraron que el metotrexate es una terapia alternativa en pacientes con granulomatosis de GW para el mantenimiento en vasculitis primarias, y con esto se podr&iacute;an evitar los eventos adversos agresivos derivados de la ciclofosfamida. Subsecuentemente, de Groot y cols.<sup>155</sup>, siguieron 65 pacientes con GW generalizada, quienes hab&iacute;an recibido ciclofosfamida por pulsos o por v&iacute;a oral como inducci&oacute;n asociada a glucocorticoides; 22 de estos se encontraban en remisi&oacute;n parcial o completa y recibieron metotrexate IV con y sin prednisona. La remisi&oacute;n completa o parcial se mantuvo en el 86% de los 22 pacientes que recibieron metotrexate solamente y en el 91% de los pacientes que recibieron metotrexate m&aacute;s prednisona, confirmando la utilidad en el mantenimiento y reducci&oacute;n de las reca&iacute;das.</p>     <p>Posteriormente, aparecen las publicaciones de tres estudios, de Langford y cols.<sup>156-158</sup> del NIH, realizados en los a&ntilde;os 1999, 2000 y 2003, quienes utilizaron metotrexate para mantener la remisi&oacute;n y encontraron que 22 de los 42 pacientes presentaron reca&iacute;das a los 15 meses en promedio. Reinhold-Keller y cols.<sup>159</sup>, con los mismos criterios de uso del metotrexate de los otros protocolos, observaron reca&iacute;das en 26 de 71 pacientes, es decir, 36.6% a los 19.4 meses. La dosis aproximada que recib&iacute;an era 18 mg/semana. Las reca&iacute;das se presentaron especialmente a nivel del ri&ntilde;&oacute;n en 16 de 26 individuos y los eventos adversos fueron la leucopenia y la neumonitis en el 5%, eventos menores a los ocasionados en comparaci&oacute;n con la ciclofosfamida oral.</p>     <p>Es com&uacute;n que las vasculitis requieran largos periodos de terapia con esteroide con eventos adversos frecuentes, como sucede con la arteritis de c&eacute;lulas gigantes; esto sumado a la alta frecuencia de reca&iacute;das y casos resistentes ha impulsado que metotrexate as&iacute; como otros f&aacute;rmacos se desarrollen como adyuvantes. Los primeros informes son de Krall en 1989<sup>160</sup> quien trat&oacute; tres pacientes sin respuesta a esteroides con mejor&iacute;a luego de metotrexate, con dosis que oscilaron entre de 7,5 a 12 mg semanales. Hern&aacute;ndez-Garc&iacute;a en 1994<sup>161</sup> con 11 pacientes, encontraron disminuci&oacute;n en los requerimientos de esteroide y tambi&eacute;n lo encontr&oacute; Van Der Veen en 1996<sup>162</sup>. En el siguiente siglo aparece el primer ensayo cl&iacute;nico controlado<sup>163</sup> con 21 pacientes, que concluye que no existe beneficio en el ahorro de corticoide. Desde ese entonces, en 2001 y 2002, aparecen dos ensayos cl&iacute;nicos m&aacute;s grandes, con resultados contradictorios. Jover JA en el 2001<sup>164 </sup>encuentra beneficio en disminuir reca&iacute;das y ahorrar esteroides, resultados totalmente opuestos al estudio m&aacute;s grande, hasta la fecha, con 98 pacientes en el a&ntilde;o siguiente<sup>165</sup>. Con motivo de resolver esta dificultad se realiza un metaan&aacute;lisis en 2006<sup>166</sup> de los estudios descritos que determina que s&iacute; existe beneficio con el uso del metotrexate en reducir las reca&iacute;das y disminuir la dosis de esteroide acumulada, raz&oacute;n por la que tiempo m&aacute;s tarde las gu&iacute;as del EULAR<sup>167</sup> recomiendan su uso en 2009. En la otra forma frecuente de vasculitis de grandes vasos, la arteritis de Takayasu, se encuentra el uso de metotrexate en informes de casos en el mismo periodo, siendo el inicial en 1989 con Liang GC.<sup>168 </sup>y descripciones sucesivas de Mevorach en 1992 con un caso<sup>169</sup> y Hofman en 1994<sup>170</sup>, &uacute;nicas referencias en las gu&iacute;as actuales donde se recomienda esta terapia para esta variedad de vasculitis<sup>167</sup>.</p>     <p><font size="3"><b>Azatioprina</b></font></p>     <p>Este medicamento inmunosupresor, al igual que la ciclofosfamida, se empez&oacute; a utilizar en las enfermedades reum&aacute;ticas. Es un antagonista de las purinas y es uno de los primeros medicamentos inmunosupresores que se empez&oacute; a utilizar en las vasculitis primarias. Fred y cols., en 1964<sup>102</sup>, utilizaron esteroides y azatioprina para tratar un paciente con G W. Posteriormente se publicaron algunos casos aislados como los de Bouroncle y cols., en 1967<sup>171</sup>, Kaplan y cols.<sup>172</sup>, Norton y cols., en 1968<sup>173</sup>, Elsner y cols.<sup>174</sup>, Choy y cols.<sup>175</sup>, Choy, Gould <i>et al</i>, en 1969, Peermohamed y cols. en 1969<sup>176</sup>, quienes trataron casos de GW en la mayor&iacute;a de las veces utilizando la asociaci&oacute;n de azatioprina con corticoides, con mejor&iacute;a del cuadro cl&iacute;nico. A&ntilde;os m&aacute;s tarde, en 1973, en el art&iacute;culo de Fauci y Wolf<sup>29</sup> se us&oacute; azatioprina para tratar algunos pacientes con GW a quienes se les hab&iacute;a administrado ciclofosfamida y ten&iacute;an una leucopenia severa. De esta manera se empez&oacute; a usar azatioprina como inductora de remisi&oacute;n. Cooper y cols., en 1978<sup>177</sup> utilizaron azatioprina para tratar un paciente con s&iacute;ndrome de CS, as&iacute; como John Lanham y cols.<sup>178</sup>, que tratan a cuatro pacientes con esta patolog&iacute;a.</p>     <p>Debido a las dudas que generaron los trabajos de Fauci y Wolf<sup>29,110</sup> sobre la posibilidad de que azatioprina indujera remisi&oacute;n, Parry y cols., en 1996<sup>179 </sup>y Jayne, Rasmussen Andrassy y cols., en 1997<sup>137 </sup>con la publicaci&oacute;n en <i>Mayo Clinic Proceedings </i>por el grupo EUVAS, analizan los diferentes reg&iacute;menes terap&eacute;uticos en la &eacute;poca encontrando la azatioprina como agente de mantenimiento importante con un papel ausente como inductor. Los mismos autores, tratando de verifcar la utilidad de la azatioprina como mantenimiento con menor grado de toxicidad que la ciclofosfamida, publican, en 2003, un estudio aleatorizado con 155 pacientes con vasculitis asociada a ANCA<sup>114</sup>, que incluy&oacute; pacientes con GW y PAM en una proporci&oacute;n importante (39%), comparando el uso de azatioprina contra dosis diarias de ciclofosfamida en el mantenimiento de la remisi&oacute;n. Los pacientes fueron inducidos con ciclofosfamida oral y prednisolona, lo que indujo una remisi&oacute;n que se logr&oacute; en el 93% de los sujetos. Despu&eacute;s de lograr la remisi&oacute;n, se establecieron dos brazos: un grupo de pacientes recibi&oacute; azatioprina (2 mg/kg/d&iacute;a) y el otro brazo continu&oacute; recibiendo ciclofosfamida oral con 10 mg de prednisolona al d&iacute;a. A los 12 meses ambos grupos fueron tratados con azatioprina (1.5 mg/kg/ d&iacute;a) y prednisona (7.5 mg/d&iacute;a). A los 18 meses no se encontr&oacute; una diferencia signifcativa, con respecto a reca&iacute;das entre los dos grupos: azatioprina (15.5%) y ciclofosfamida oral (13.7%).</p>     <p>Este estudio demostr&oacute; la posibilidad de mantener la remisi&oacute;n en pacientes con vasculitis asociada a ANCA prescindiendo de la ciclofosfamida por v&iacute;a oral. El estudio, cuya hip&oacute;tesis era que azatioprina era equivalente a ciclofosfamida en mantener la remisi&oacute;n en pacientes con GW y poliange&iacute;tis microsc&oacute;pica (PAM), se conoce como CYCAZAREM (<i>Cyclophosphamide versus azathioprine for the remission phase of vasculitis</i>), el cual refut&oacute; el concepto de que el uso prolongado de ciclofosfamida es mejor porque controla la enfermedad. Se demostr&oacute; que 12 meses de ciclofosfamida no fue m&aacute;s efectivo que tres meses de ciclofosfamida como inductor, seguidos por azatioprina para mantener la remisi&oacute;n. Este estudio demuestra que se puede reducir el tiempo de exposici&oacute;n a la ciclofosfamida y, por tanto, reeval&uacute;a el concepto de duraci&oacute;n de la ciclofosfamida por v&iacute;a oral.</p>     <p>M&aacute;s tarde, en 2004. Slot y cols.<sup>180</sup>, encuentran que en 128 pacientes con vasculitis ANCA positivas, que inclu&iacute;an en esta ocasi&oacute;n un n&uacute;mero no conocido de personas con CS, la eficacia de azatioprina para prevenir los eventos de reca&iacute;da depende, de forma importante, del estado de positividad o negatividad de los ANCA al momento del cambio de ciclofosfamida a azatioprina, terminada la fase de inducci&oacute;n. Demostrada la utilidad de azatioprina en el mantenimiento, en 2008 se compar&oacute;, en 123 pacientes con GW y PAM, con metotrexate en cuanto a perfil de seguridad y eficacia en el estudio WEGENT<sup>181</sup>, con ocurrencia de menos eventos adversos en el grupo de azatioprina, sin diferencia en el tiempo a la reca&iacute;da, posicion&aacute;ndola como una de las mejores opciones de tratamiento.</p>     <p>En cuanto a la arteritis de c&eacute;lulas gigantes, la evidencia se remonta a 1986 con M de Silva<sup>182</sup> que hace referencia a casos anecd&oacute;ticos previos de tratamientos con azatioprina no informados en la literatura; este estudio aleatorizado con 31 pacientes encuentra que el desenlace primario de utilidad para reducir la dosis de esteroide es estad&iacute;sticamente signifcativo a las 52 semanas de seguimiento, pero a pesar de esto, debido a que no hay mayor evidencia adicional en la actualidad, no hay una recomendaci&oacute;n para su uso en esta enfermedad<sup>167</sup>.</p>     ]]></body>
<body><![CDATA[<p>Diferentes metas han sido planteadas para pacientes con arteritis de Takayasu, siendo de gran inter&eacute;s el beneficio de estos medicamentos en regresi&oacute;n o no progresi&oacute;n de lesiones esten&oacute;ticas vasculares como primera complicaci&oacute;n de la enfermedad. Los primeros informes del uso de azatioprina son de Kerr<sup>183</sup> y Cybulska<sup>184</sup>, en 1994, posteriormente, en el 2003, Valsakumar<sup>185</sup> publica un estudio con 15 pacientes a dosis de 2 mg/kg/d&iacute;a, en quienes se realiz&oacute; angiograf&iacute;a previa y posterior a un a&ntilde;o de tratamiento, con resultados similares a otros trabajos con metotrexate<sup>170,186 </sup>y esteroides solos en los cuales no hubo reversi&oacute;n de las lesiones, sin aparici&oacute;n de nuevas estenosis.</p>     <p><font size="3"><b>Mofetil micofenolato</b></font></p>     <p>El mofetil micofenolato (MM) es un f&aacute;rmaco inmunosupresor con una relativa baja tasa de toxicidad, dado su mecanismo de acci&oacute;n linfoselectivo<sup>187</sup>. El &aacute;cido micofen&oacute;lico es el metab&oacute;lico activo del MM, inhibe reversiblemente la inosinmonofosfato-deshidrogenasa, enzima clave en la s&iacute;ntesis de novo de las purinas<sup>188,189</sup>. Su uso cl&iacute;nico se inici&oacute; en la d&eacute;cada de los 90, especialmente, en el tratamiento de pacientes trasplantados<sup>190</sup>, extendi&eacute;ndose despu&eacute;s a pacientes con artritis reumatoide<sup>191</sup>. La primera experiencia, publicada, con la administraci&oacute;n de MM en cuatro pacientes con vasculitis sist&eacute;mica asociada a ANCA no especifcada la inform&oacute; Nowack en 1997<sup>192</sup>. Posteriormente aparecen m&aacute;s informes del mismo caso, el mismo autor y cols. publicaron, en 1999, un estudio piloto prospectivo, no cegado, realizado en Alemania en 11 pacientes con vasculitis sist&eacute;mica pauciinmunes, a quienes administraron terapia de mantenimiento con MM e informaron que el f&aacute;rmaco fue bien tolerado, efectivo y con baja toxicidad<sup>193</sup>.</p>     <p>Desde esta &eacute;poca surgen la gran mayor&iacute;a de trabajos y grandes estudios; Haidinger, en 2000, publica un estudio sobre el tratamiento de vasculitis de peque&ntilde;o vaso asociada a ANCA con MM, informando plausibilidad terap&eacute;utica<sup>194</sup>. Nachman presenta, en el mismo a&ntilde;o, un trabajo sobre viabilidad terap&eacute;utica con MM para las reca&iacute;das de las vasculitis de peque&ntilde;o vaso<sup>129</sup>. Le Hello informa, en 2002, la mejor&iacute;a de un pioderma gangrenoso en un paciente con GW con la administraci&oacute;n de MM<sup>195</sup>. Haubitz publica, en 2002, una serie de cinco pacientes con enfermedad renal terminal secundaria a vasculitis asociada a ANCA, en los cuales se utiliz&oacute; como terapia de mantenimiento MM, mostrando mejor&iacute;a en el pron&oacute;stico de la enfermedad<sup>196</sup>. Assaf informa en 2004, un paciente con s&iacute;ndrome de CS exitosamente tratado con MM<sup>197</sup>. Los estudios de terapia de mantenimiento se desarrollaron luego de la propuesta del uso de MM como terapia de inducci&oacute;n en vasculitis. Waiser y cols., publicaron el primer caso de un paciente con vasculitis asociada a ANCA, quien alcanz&oacute; la remisi&oacute;n con el uso de MM como terapia de inducci&oacute;n en una reca&iacute;da<sup>198</sup>. Seguidamente Langford publica, en 2004, una serie de casos de catorce pacientes con GW con MM como terapia de mantenimiento, siendo &eacute;sta bien tolerada pero con alta frecuencia de reca&iacute;das (43%)<sup>199</sup>. Joy, en 2005, public&oacute; un estudio piloto usando MM en las reca&iacute;das o resistencia de las vasculitis de peque&ntilde;o vaso, mostrando ser una opci&oacute;n razonable en el tratamiento de esta patolog&iacute;a<sup>200</sup>. Para el a&ntilde;o 2006, en un art&iacute;culo de revisi&oacute;n de Koukoulaki, se evalu&oacute; la eficacia y tolerabilidad de MM en 51 pacientes con vasculitis sist&eacute;mica asociada a ANCA, observando una eficacia y tasa de reca&iacute;das variables, probablemente asociadas a las dosis utilizadas de MM<sup>201</sup>.</p>     <p>La literatura m&aacute;s reciente al respecto se encuentra muy cercana, en el 2010, Hiemstra y cols., del grupo EUVAS<sup>202</sup>, incluyen 156 pacientes con GW y PAM aleatorizados a MM o azatioprina con un seguimiento de 39 meses, evidenciando mayor n&uacute;mero de reca&iacute;das con MM con igual aparici&oacute;n de eventos adversos, raz&oacute;n para que posiblemente no contin&uacute;e como recomendaci&oacute;n en la terapia de mantenimiento actual<sup>l74</sup>.</p>     <p>Otro aporte completamente diferente se desarroll&oacute; con base en la b&uacute;squeda de una terapia alterna a la usual con ciclofosfamida para inducir la remisi&oacute;n. Basados en la excelente respuesta en el manejo de rechazo agudo de trasplantes<sup>203</sup> y los primeros trabajos en nefritis l&uacute;pica<sup>204</sup>, en 1999 comienzan a aparecer informes de casos de pacientes con vasculitis severas que responden al tratamiento con MM como inductor. Es el caso de Hu W. en glomerulonefritis r&aacute;pidamente progresivas<sup>205</sup>, Waiser J.<sup>198</sup> en un paciente con GW que no toleraba la ciclofosfamida y Joy MS, en 2005<sup>200</sup>, que trat&oacute; 12 pacientes con vasculitis ANCA positivos, en reca&iacute;da con MM, con una remisi&oacute;n de 60% a seis meses. En el a&ntilde;o 2007, en una investigaci&oacute;n de Stassen y cols., administraron dosis de MM de 1 g dos veces al d&iacute;a como inductor de remisi&oacute;n en 32 pacientes con vasculitis activa que no pod&iacute;a ser tratada con ciclofosfamida, induciendo remisi&oacute;n completa de la enfermedad en 78% de los individuos, parcial en 19% y no respondieron el 3%<sup>116</sup>.</p>     <p>En la actualidad ya contamos con ensayos aleatorizados comparativos: el primero realizado en China en el 2008, por Weixin Hu y cols.<sup>115</sup>, con 35 pacientes diagnosticados con vasculitis ANCA positivos que se aleatorizaron a MM o ciclofosfamida, y como resultado se obtuvo mayor cantidad de personas en remisi&oacute;n a los seis meses en el grupo de MM (77.8% <i>vs</i>. 47.1%), as&iacute; como una mayor recuperaci&oacute;n de la funci&oacute;n renal y disminuci&oacute;n a la normalidad de los niveles s&eacute;ricos de ANCA. En el 2009 las gu&iacute;as EULAR dados estos antecedentes<sup>74</sup>, recomiendan el uso de MM en pacientes con reca&iacute;das o persistencia de la enfermedad, junto con otros medicamentos. Posterior a la gu&iacute;a se encuentra &uacute;nicamente, como trabajo principal, el realizado por Francisco Silva en 2010 en la Cl&iacute;nica Mayo, con 17 pacientes diagnosticados con PAM que fueron inducidos y mantenidos con MM, con una adecuada respuesta y 13 pacientes persistiendo en remisi&oacute;n por 18 meses<sup>206</sup>. Tambi&eacute;n se han informado efectos adversos con el uso de MM en pacientes con vasculitis<sup>207</sup> similares a los otros medicamentos, siendo los m&aacute;s frecuentes las infecciones<sup>202</sup>, por ejemplo, Woywodt y cols., en 2000, informaron sobre un caso de colitis por citomegalovirus durante el tratamiento con MM para una GW<sup>208</sup>.</p>     <p>Con respecto a la terap&eacute;utica para otro tipo de vasculitis con MM, Daina y cols., describen tres pacientes, en 1999, con arteritis de Takayasu quienes respondieron bien con 2 g diarios de MM y no presentaron efectos adversos mayores<sup>209</sup>, de la misma forma, en el 2007 Shinjo y cols.<sup>210</sup>, y en 2010 Ruchika Goel y cols.<sup>211</sup>, escribieron conclusiones similares; sin embargo, no hay menci&oacute;n de este medicamento en las gu&iacute;as para el manejo de vasculitis de grandes vasos, quiz&aacute;s por falta de evidencia m&aacute;s fuerte.</p>     <p>En contraste, MM parece ser inefectivo en el tratamiento de la enfermedad de Behcet, seg&uacute;n un trabajo informado por Adler en 2001<sup>212</sup>. Worm public&oacute; en el 2000 un informe de caso sobre un paciente tratado exitosamente con MM para una vasculitis urticariante hipocomplement&eacute;mica<sup>213</sup>. En la vasculitis crioglobulin&eacute;mica asociada a hepatitis C la informaci&oacute;n es muy pobre, a pesar del conocimiento de la asociaci&oacute;n de esta infecci&oacute;n con m&uacute;ltiples manifestaciones autoinmunes<sup>214</sup> y de la hip&oacute;tesis del efecto antiviral similar a la ribavirina del MM<sup>215</sup>. Se encuentran, por tanto, informes de pacientes tratados con MM en m&uacute;ltiples enfermedades autoinmunes<sup>216</sup>, incluyendo vasculitis. Por ejemplo: Lerardi, en 2003<sup>217</sup>, con manifestaciones hematol&oacute;gicas como anemia hemol&iacute;tica; Reed, en 2001<sup>218</sup>, con glom&eacute;rulo nefritis y vasculitis, Capponetto, en 2001, con miastenia gravis<sup>219</sup>.</p>     <p>En cuanto a los pacientes sin infecci&oacute;n por virus de la hepatitis C la recomendaci&oacute;n por las gu&iacute;as, sin evidencia de peso al respecto, es dirigir el tratamiento de forma similar a las vasculitis ANCA positivas, donde el uso de MM es limitado, como se expuso previamente<sup>74</sup>.</p>     ]]></body>
<body><![CDATA[<p><font size="3"><b>Rituximab</b></font></p>     <p>La utilizaci&oacute;n de rituximab, en las vasculitis sist&eacute;micas asociadas a ANCA, surge de la observaci&oacute;n cl&iacute;nica que en aproximadamente 10% de los pacientes la enfermedad es refractaria al tratamiento convencional con ciclofosfamida<sup>220,221</sup>. Rituximab es un anticuerpo monoclonal quim&eacute;rico que induce una depleci&oacute;n selectiva de los linfocitos B, mediante la uni&oacute;n al ant&iacute;geno de superficie CD20, su inter&eacute;s en el uso para enfermedades autoinmunes est&aacute; en crecimiento. Specks y cols., en 2001, publicaron un informe de caso sobre un paciente con granulomatosis con poliangeitis con reca&iacute;da de la enfermedad y toxicidad por ciclofosfamida, a quien administraron rituximab logrando la remisi&oacute;n, constituyendo el primer reporte al respecto<sup>222</sup>. En 2003 fueron publicadas dos peque&ntilde;as series de pacientes con vasculitis asociadas a ANCA, en quienes se obtuvo alg&uacute;n beneficio con la administraci&oacute;n de rituximab<sup>223,224</sup>. Posteriormente, el estudio de Karina Keogh y cols., en 2005<sup>220</sup>, valor&oacute; la eficacia del rituximab en varios pacientes con vasculitis asociada a anti-proteinasa 3, quienes no hab&iacute;an presentado respuesta favorable a ciclofosfamida; evaluaron 11 pacientes y concluyeron que rituximab, en este grupo de pacientes, puede ser una opci&oacute;n terap&eacute;utica efectiva y segura, igual que como se planteaba para casos refractarios luego de la inducci&oacute;n exitosa<sup>225</sup>, sugerencia de las gu&iacute;as actuales.</p>     <p>Posteriormente, hay informes de casos de tratamientos exitosos con este medicamento<sup>226,227</sup>. Keogh publica en 2006 un ensayo piloto, prospectivo, no cegado en 10 pacientes, sobre el uso de rituximab en vasculitis asociada a ANCA, mostrando que el anti-CD20 fue bien tolerado e induc&iacute;a remisi&oacute;n en este grupo de sujetos<sup>228</sup>. Jhon Stone y cols., publicaron en <i>New England Journal of Medicine</i>, en 2010, un ensayo doble ciego, aleatorizado, multic&eacute;ntrico, de no inferioridad, comparando el uso de rituximab <i>versus </i>ciclofosfamida en vasculitis asociada a ANCA, en el que evidenciaron que la terapia anti-CD20 no fue inferior a ciclofosfamida para la inducci&oacute;n y remisi&oacute;n de la vasculitis<sup>229</sup>. Cartin-Ceba inform&oacute; en 2011, en un estudio piloto no cegado, en tres pacientes con s&iacute;ndrome de CS, variedad escasamente incluida en otros estudios, con compromiso renal sin mejor&iacute;a a corticoides, que la administraci&oacute;n de rituximab fue segura y exitosa en estos individuos<sup>230</sup>.</p>     <p>Adem&aacute;s, de las terapias previamente descritas el uso de terapia biol&oacute;gica, especialmente con rituximab, ha sido estudiado como monoterapia o en asociaci&oacute;n a la terapia antiviral en vasculitis crioglobulin&eacute;mica<sup>231</sup>, la primera en general en pacientes con pobre respuesta a tratamiento inicial con terapia, encontr&aacute;ndose una respuesta cl&iacute;nica completa hasta del 70% en ensayos no controlados, as&iacute; como una adecuada respuesta a un segundo ciclo despu&eacute;s de la primera reca&iacute;da<sup>232</sup>, a pesar de la posible relaci&oacute;n del uso de la terapia con un aumento en el conteo de la carga viral<sup>233</sup>.</p>     <p><font size="3"><b>Anti-TNF</b></font></p>     <p>Los medicamentos que bloquean el factor de necrosis tumoral alfa (anti-TNF) han sido tambi&eacute;n empleados para el tratamiento de las vasculitis. Los primeros estudios publicados fueron informes de caso; Hassard en 2001 inform&oacute; sobre un paciente con enfermedad de Behcet gastrointestinal tratado con infiximab<sup>234</sup>, Robertson inform&oacute; el tratamiento de ulceraciones genitales y orales en enfermedad de Behcet con infiximab, obteniendo mejor&iacute;a en el paciente<sup>235</sup> y Goossens public&oacute;, en 2001, remisi&oacute;n de la misma enfermedad con infiximab<sup>236</sup>.</p>     <p>Para el tratamiento de la granulomatosis con poliangeitis , Stone emple&oacute;, en 2001, etanercept sumado a la terapia convencional en un estudio a seis meses no cegado, el cual fue bien tolerado, con pocos eventos adversos<sup>237</sup>. De esta forma, fue abierto un gran campo de investigaci&oacute;n en el tratamiento de las vasculitis sist&eacute;micas con la utilizaci&oacute;n de la terapia biol&oacute;gica<sup>238</sup>. Luego Booth, en 2002, describi&oacute; seis pacientes con vasculitis refractaria asociada a ANCA tratados con infiximab, recomendando una nueva alternativa terap&eacute;utica para esta patolog&iacute;a<sup>239</sup>, lo mismo que Lamprecht en 2002, quien evalu&oacute; la inducci&oacute;n de remisi&oacute;n en seis pacientes con granulomatosis de GW refractaria a la terapia convencional, logrando la remisi&oacute;n de cinco pacientes durante 6 a 24 meses de seguimiento<sup>240</sup>. El mismo a&ntilde;o Arbach public&oacute; tres informes de caso de pacientes con s&iacute;ndrome de CS refractarios a ciclofosfamida, en quienes utiliz&oacute; etanercept en un caso e infiximab en dos pacientes, obteniendo un aceptable perfil de seguridad<sup>241</sup>. Aparecen los primeros estudios de Booth en 2004, quien publica un ensayo cl&iacute;nico, prospectivo, multic&eacute;ntrico, no cegado sobre la utilizaci&oacute;n de infiximab en pacientes con vasculitis sist&eacute;mica asociada a ANCA, observando 88% de remisi&oacute;n, 20% de exacerbaciones en respondedores in&iacute;ciales y 21% de infecciones severas<sup>242</sup>.</p>     <p>Contrario a lo que se hab&iacute;a informado respecto a la inducci&oacute;n de remisi&oacute;n en vasculitis ANCA positivas, Chandesris, en 2004, informa la administraci&oacute;n de infiximab en dos pacientes con vasculitis secundaria a crioglobulinemia mixta asociada a hepatitis C, con resultados desalentadores en la evoluci&oacute;n cl&iacute;nica de los pacientes; por tanto, no recomienda su utilizaci&oacute;n<sup>243</sup>. Tambi&eacute;n se han utilizado los anti-TNF en el tratamiento de la arteritis de Takayasu. Hofman, en 2004, public&oacute; un estudio piloto para el tratamiento de las reca&iacute;das de esta enfermedad con anti-TNF, evidenciando mejor&iacute;a y una aceptable remisi&oacute;n de la arteritis, advirtiendo la necesidad de posteriores estudios controlados y aleatorizados, siendo Hofman, en el mismo a&ntilde;o<sup>244</sup> uno de los autores de los pocos estudios, reclutando 15 pacientes con Takayasu activo o refractario, siete tratados con etanercept y ocho con infiximab, concluyendo que estos medicamentos pueden ser &uacute;tiles para inducir la remisi&oacute;n y mantenimiento libre de reca&iacute;das, lo que justifica la realizaci&oacute;n de un ensayo cl&iacute;nico controlado a&uacute;n m&aacute;s grande.</p>     <p>Paralelamente, se evalu&oacute; la importancia de la terapia biol&oacute;gica como mantenimiento; en 2005, es publicado en <i>New England Journal of Medicine </i>un ensayo cl&iacute;nico aleatorizado, controlado con placebo, para evaluar el mantenimiento de la remisi&oacute;n con etanercept en 180 pacientes con GW, y se demostr&oacute; que el anti-TNF no es efectivo en el mantenimiento de la remisi&oacute;n y adem&aacute;s se present&oacute; una alta tasa de complicaciones asociadas al tratamiento<sup>245</sup>, hallazgo corroborado por Sangle en 2007, cuando public&oacute; un estudio prospectivo con pacientes en reca&iacute;da de vasculitis sist&eacute;mica, quienes recibieron infiximab durante seis meses, presentando mayores efectos adversos y falta de beneficios cl&iacute;nicos<sup>246</sup>. Antes de este &uacute;ltimo, en una revisi&oacute;n cl&iacute;nica de Huugen en 2006 sobre el papel de los anti-TNF en vasculitis sist&eacute;mica, se encontr&oacute; que los ensayos cl&iacute;nicos no han mostrado un claro beneficio en esta patolog&iacute;a; por el contrario, algunos trabajos no han encontrado efectividad y m&aacute;s a&uacute;n otros muestran un aumento de los efectos adversos, principalmente en la terapia de mantenimiento<sup>247,</sup> <sup>248</sup>.</p>     <p>Con respecto a otros medicamentos biol&oacute;gicos, Nishimoto en 2008, en un informe de caso, describe que la mol&eacute;cula tocilizumab (anticuerpo humanizado contra el receptor de IL-6) fue efectivo para tratar un paciente con arteritis de Takayasu refractaria, complicada con colitis ulcerativa<sup>249</sup>. Un estudio prospectivo, publicado por Laurino en 2010, que incluy&oacute; 14 pacientes con exacerbaci&oacute;n de vasculitis asociada a ANCA o reca&iacute;da, utiliz&oacute; adalimumab por tres meses en combinaci&oacute;n con ciclofosfamida, y las tasas de respuesta y eventos adversos fueron similares a la terapia convencional<sup>250</sup>. En cuanto a otras variedades de vasculitis, Cantini inform&oacute; la utilizaci&oacute;n de infiximab en arteritis de c&eacute;lulas gigantes en cuatro pacientes con resultados alentadores<sup>251</sup> y Tan inform&oacute; un desenlace similar con etanercept<sup>252</sup>. Gary S Hofman, en 2007<sup>253</sup>, public&oacute; uno de los estudios m&aacute;s grandes al respecto con 44 pacientes aleatorizados a placebo o infiximab; este estudio se detuvo tempranamente por el resultado de an&aacute;lisis internos en la semana 22, no encontrando diferencias en los desenlaces primarios como ausencia de reca&iacute;das y disminuci&oacute;n de dosis de corticoide, pero con un aumento importante en episodios infecciosos. M&aacute;s tarde, otro ensayo doble ciego, controlado con placebo, no permiti&oacute; sacar conclusiones definitivas sobre la utilidad de etanercept en pacientes con arteritis de c&eacute;lulas gigantes<sup>248</sup>. En la <a href="#tab1">tabla 1</a> encontraremos un resumen de los estudios realizados con diferentes medicamentos, las formas de intervenci&oacute;n y los resultados en vasculitis asociada a ANCA.</p>     ]]></body>
<body><![CDATA[<p>    <center><a name="tab1"><img src="img/revistas/rcre/v19n3/v19n3a03t1.jpg"></a></center></p>      <p><font size="3"><b>Tocilizumab</b></font></p>     <p>La interleucina 6 (IL-6) es una mol&eacute;cula con gran potencial antiinfamatorio y efectos pleiotr&oacute;picos sist&eacute;micos. El bloqueo de la acci&oacute;n de la IL-6 con tocilizumab (TCZ), un anticuerpo monoclonal humanizado contra el receptor de IL-6, ha demostrado ser efcaz en el tratamiento de la artritis reumatoide (AR) y la artritis idiop&aacute;tica juvenil (AIJ) de inicio sist&eacute;mico y est&aacute; aprobado para tales usos<sup>256</sup>.</p>     <p>La IL-6 tiene un papel importante en la fisiopatolog&iacute;a de la arteritis de c&eacute;lulas gigantes (ACG) y la arteritis de Takayasu (AT), que son consideradas vasculitis de grandes vasos<sup>257</sup>. Se han demostrado niveles tisulares elevados de IL-6 en las arterias de pacientes con ACG que mostraron ser m&aacute;s resistentes a la terapia con corticosteroides<sup>258</sup>. Los niveles s&eacute;ricos de IL-6 tambi&eacute;n se han encontrado elevados en ACG y en AT259,260.</p>     <p>Es as&iacute; como un nuevo escenario se abre para el TCZ en el tratamiento de las vasculitis de grandes vasos, como la ACG y la AT; que a&uacute;n no se ha contemplado en las recomendaciones internacionales<sup>167</sup>.</p>     <p>Lo que se conoce de TCZ en vasculitis de grandes vasos proviene de informes de casos y de series de casos donde el uso de la mol&eacute;cula ayud&oacute; al tratamiento.</p>     <p>En el caso reportado de una mujer con AT refractaria activa, complicada por colitis ulcerativa (CU), mejor&oacute; las manifestaciones cl&iacute;nicas y de laboratorio de la AT, as&iacute; como disminuy&oacute; la actividad de la CU<sup>249</sup>. TCZ se utiliz&oacute; con &eacute;xito en un paciente con AT refractaria a m&uacute;ltiples inmunosupresores convencionales y dos bloqueadores del factor de necrosis tumoral (anti-TNF), a dosis de 8 mg/kg mensual, por seis meses. Los &iacute;ndices de actividad infamatoria se normalizaron y la prednisolona pudo ser disminuida<sup>261</sup>.</p>     <p>En ACG, se inform&oacute; un caso refractario con ile&iacute;tis y dependencia de altas dosis de esteroide a pesar de metotrexate. Despu&eacute;s de las infusiones de TCZ no se encontraron reca&iacute;das a los seis meses, incluso con disminuci&oacute;n de los corticosteroides<sup>262</sup>. En una serie de casos con siete pacientes (cinco con ACG y dos con AT); tres con diagn&oacute;stico reciente y cuatro resistentes a corticosteroides; se utiliz&oacute; TCZ y durante el seguimiento todos obtuvieron una r&aacute;pida respuesta, con normalizaci&oacute;n de los reactantes de fase aguda y una disminuci&oacute;n progresiva de la dosis de prednisolona, sin reca&iacute;das o efectos adversos relacionados<sup>263</sup>. TCZ funciona en casos refractarios al tratamiento convencional con esteroides, con o sin asociaci&oacute;n de otro inmunosupresor<sup>264</sup>. No existen, por ahora, resultados de ensayos cl&iacute;nicos controlados y aleatorios que eval&uacute;en la efectividad de TCZ en el tratamiento de la ACG y la AT y que comparen su eficacia contra los esquemas establecidos. Dos ensayos cl&iacute;nicos est&aacute;n en etapa de reclutamiento para evaluar el TCZ en el tratamiento de pacientes con ACG y polimialgia reum&aacute;tica (PMR). (<i>A Phase II, Randomized, Double-blind, Placebo Controlled Study of Tocilizumab in Patients with Giant Cell Arteritis.ClinicalTrials.gov identifer: NCT01450137; Phase IIa of Tocilizumab in the Treatment of Polymyalgia Rheumatica. ClinicalTrials.gov identifer: NCT01396317</i>).</p>     <p>Hoy, ante la dificultad que pueden ofrecer los esquemas actuales de tratamiento en vasculitis de grandes vasos, TCZ cuenta con la sustentaci&oacute;n de que su efecto podr&iacute;a resultar beneficioso en estos escenarios<sup>265</sup>.</p>     ]]></body>
<body><![CDATA[<p><font size="3"><b>Gu&iacute;as de tratamiento</b></font></p>     <p>El Grupo Europeo para el estudio de las EUVAS, public&oacute; en 2009 las recomendaciones EULAR para el tratamiento de las vasculitis primarias de peque&ntilde;o y mediano vaso, marcando un punto importante de partida, unifcando toda la literatura en reg&iacute;menes terap&eacute;uticos &uacute;nicos. Recomiendan la combinaci&oacute;n de ciclofosfamida (IV u oral) y glucocorticoides para la inducci&oacute;n de la remisi&oacute;n<sup>74</sup>. El r&eacute;gimen dise&ntilde;ado es ciclofosfamida 15 mg/kg (m&aacute;ximo 1.2 g) cada dos semanas por los primeros 3 pulsos, seguido por infusiones cada tres semanas por los pr&oacute;ximos tres a seis pulsos<sup>132,266</sup>. Los pulsos IV de ciclofosfamida han sido usados en PAN y s&iacute;ndrome de CS con igual eficacia y menor incidencia de eventos adversos que las bajas dosis orales diarias de ciclofosfamida, por lo que la sugerencia es a preferir el uso IV<sup>120,267</sup>. Tambi&eacute;n est&aacute; recomendada la combinaci&oacute;n de metrotexate (oral o parenteral) y glucocorticoides como alternativa, menos t&oacute;xica, a la ciclofosfamida para la inducci&oacute;n de remisi&oacute;n en vasculitis asociada a ANCA que no amenacen la vida o tengan compromiso de &oacute;rganos, especialmente ri&ntilde;&oacute;n<sup>113</sup>.</p>     <p>Los glucocorticoides a altas dosis son una parte importante de la terapia de inducci&oacute;n de la remisi&oacute;n; es com&uacute;n iniciar con prednisolona 1 mg/kg/d&iacute;a y no reducir a menos de 15 mg/d&iacute;a en los primeros tres meses<sup>137</sup>. Cuando se requiere un r&aacute;pido efecto, los pulsos de metilprednisolona pueden ser usados en adici&oacute;n a la prednisolona oral como parte de la terapia de inducci&oacute;n<sup>133</sup>. La plasmaf&eacute;resis est&aacute; recomendada en pacientes seleccionados con enfermedad renal r&aacute;pidamente progresiva, con el fin de salvar la funci&oacute;n renal<sup>254</sup>. La terapia de mantenimiento est&aacute; recomendada con una combinaci&oacute;n de glucocorticoides a bajas dosis y azatioprina sobre lefunomida o metotrexate<sup>159,180,268</sup>, siendo el primero el m&aacute;s recomendado. En cuanto a la terapia en pacientes con cuadros refractarios, existe evidencia escasa y en ocasiones inconsistente; sin embargo, se ha recomendado el uso del MM, rituximab, infiximab, gamaglobulina endovenosa para especifcar mayores datos de beneficios de cada uno de estos.</p>     <p>Tambi&eacute;n, en 2009, EUVAS, public&oacute; las recomendaciones EULAR para el tratamiento de las vasculitis de grandes vasos<sup>167</sup>. Este grupo de estudio recomienda el inicio temprano de glucocorticoides a altas dosis para la inducci&oacute;n de remisi&oacute;n. Los pulsos de metil-prednisolona pueden ser &uacute;tiles en fases tempranas de la enfermedad con manifestaciones oculares iniciales en arteritis de c&eacute;lulas gigantes, especialmente. La dosis inicial de prednisolona es 1 mg/kg/d&iacute;a, la cual deber&iacute;a ser mantenida por 1 mes y despu&eacute;s gradualmente disminuida hasta 10-15 mg/d&iacute;a a los tres meses<sup>59,85,269</sup>. Otra recomendaci&oacute;n sobre vasculitis de grandes vasos, es el uso de un agente inmunosupresor como terapia coadyuvante. Se puede administrar metotrexate como medicamento ahorrador de esteroides y tiene un efecto modesto en reducir la tasa de reca&iacute;das<sup>163,166</sup>. La combinaci&oacute;n de infiximab y glucocorticoides no reduce el riesgo de reca&iacute;da comparada con la monoterapia con glucocorticoides; por tanto, no se recomienda su uso en arteritis de c&eacute;lulas gigantes<sup>253</sup>. La azatioprina y el metotrexate se pueden utilizar como coadyuvantes en la terapia de la arteritis de Takayasu; pueden ayudar a mejorar el control de la enfermedad y facilitan la disminuci&oacute;n de la dosis de glucocorticoides, sin beneficio sobre regresi&oacute;n de lesiones esten&oacute;ticas<sup>185</sup>.</p> <hr>     <p><font size="3"><b>Referencias</b></font></p>     <!-- ref --><p>1. Hench PS KE, Slocumb CH, Polley HF. 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