<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462006000400010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Uso de tacrolimus en pediatría]]></article-title>
<article-title xml:lang="en"><![CDATA[Use of tacrolimus in pediatrics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Pérez]]></surname>
<given-names><![CDATA[Herlinda]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medeiros-Domingo]]></surname>
<given-names><![CDATA[Mara]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Laboratorio de Farmacología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Departamento de Nefrología ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<volume>63</volume>
<numero>4</numero>
<fpage>276</fpage>
<lpage>285</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462006000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462006000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462006000400010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El tacrolimus es un fármaco inmunosupresor inhibidor de calcineurina utilizado principalmente para prevenir el rechazo de órganos sólidos. También se emplea como inmunosupresor de segunda línea en otras enfermedades de origen inmunológico entre las que destacan: síndrome nefrótico, lupus eritematoso sistémico, dermatitis atópica, vitíligo y psoriasis entre otras. En este artículo se revisa la farmacocinética, monitoreo terapéutico, efectos adversos y toxicidad del tacrolimus en pacientes pediátricos, haciendo énfasis en los padecimientos en los que ha demostrado utilidad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Tacrolimus is a calcineurin inhibitor immunosuppressive agent used to prevent rejection in solid organ transplantation. It has also been used in several immunological diseases including nephrotic syndrome, systemic lupus eritematosus, atopic dermatitis, vitiligo and psoriasis. This article is a review of tacrolimus pharmacokinetics, therapeutic monitoring, adverse effects, toxicity and clinical use in children.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tacrolimus]]></kwd>
<kwd lng="es"><![CDATA[farmacocinética]]></kwd>
<kwd lng="es"><![CDATA[monitoreo terapéutico]]></kwd>
<kwd lng="es"><![CDATA[trasplante]]></kwd>
<kwd lng="en"><![CDATA[Tacrolimus]]></kwd>
<kwd lng="en"><![CDATA[pharmacokinetics]]></kwd>
<kwd lng="en"><![CDATA[drug monitoring]]></kwd>
<kwd lng="en"><![CDATA[transplant]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Tema pedi&aacute;trico</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Uso de tacrolimus en pediatr&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Use of tacrolimus in pediatrics</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>M. en C. Herlinda Reyes&#150;P&eacute;rez<sup>1</sup>, Dra. Mara Medeiros&#150;Domingo<sup>2</sup></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>1 Laboratorio de Farmacolog&iacute;a</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>2 Departamento de Nefrolog&iacute;a, Hospital lnfantil de M&eacute;xico Federico G&oacute;mez, M&eacute;xico, </i>D.F., <i>M&eacute;xico,</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">El tacrolimus es un f&aacute;rmaco inmunosupresor inhibidor de calcineurina utilizado principalmente para prevenir el rechazo de &oacute;rganos s&oacute;lidos. Tambi&eacute;n se emplea como inmunosupresor de segunda l&iacute;nea en otras enfermedades de origen inmunol&oacute;gico entre las que destacan: s&iacute;ndrome nefr&oacute;tico, lupus eritematoso sist&eacute;mico, dermatitis at&oacute;pica, vit&iacute;ligo y psoriasis entre otras.</font></p>     <p align="justify"><font face="verdana" size="2">En este art&iacute;culo se revisa la farmacocin&eacute;tica, monitoreo terap&eacute;utico, efectos adversos y toxicidad del tacrolimus en pacientes pedi&aacute;tricos, haciendo &eacute;nfasis en los padecimientos en los que ha demostrado utilidad.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave. </b>Tacrolimus; farmacocin&eacute;tica; monitoreo terap&eacute;utico; trasplante.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Tacrolimus is a calcineurin inhibitor immunosuppressive agent used to prevent rejection in solid organ transplantation. It has also been used in several immunological diseases including nephrotic syndrome, systemic lupus eritematosus, atopic dermatitis, vitiligo and psoriasis.</font></p>     <p align="justify"><font face="verdana" size="2">This article is a review of tacrolimus pharmacokinetics, therapeutic monitoring, adverse effects, toxicity and clinical use in children.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words. </b>Tacrolimus; pharmacokinetics; drug monitoring; transplant.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Apoyado por Fondo Sectorial Salud&#150;2004&#150;c01&#150;193</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Solicitud de sobretiros: </b>    <br>     <i>Dra. Mara Medeiros Domingo,     <br>   Departamento de Nefrolog&iacute;a, Hospital Infantil de M&eacute;xico Federico G&oacute;mez,     <br>   Calle Dr. M&aacute;rquez # I 62, Col. Doctores,     <br>   C.P. 06720, M&eacute;xico, D.F.,     <br> M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Fecha de recepci&oacute;n: 29&#150;03&#150;2006.     <br>   Fecha de aprobaci&oacute;n: 12&#150;10&#150;2006.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Informaci&oacute;n General sobre el tacrolimus</b></font></p>     <p align="justify"><font face="verdana" size="2">El tacrolimus (FK506) es un compuesto macr&oacute;lido, altamente lipof&iacute;lico y con peso molecular de 804. Es insoluble en agua pero altamente soluble en solventes org&aacute;nicos, tiene una intensa actividad inmunosupresora. Se emplea principalmente para prevenir y tratar el rechazo de &oacute;rganos s&oacute;lidos, pero tambi&eacute;n en otras enfermedades de origen auto inmune.<sup>1,</sup><sup>2</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Presentaciones farmac&eacute;uticas</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>Formulaci&oacute;n intravenosa: </i>contiene tacrolimus 5 mg/ mL, alcohol y un surfactante. Debe diluirse en dextrosa o soluci&oacute;n salina y se recomienda administrar en infusi&oacute;n continua para reducir su nefrotoxicidad.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Formulaci&oacute;n oral: </i>c&aacute;psulas de 1 y 5 mg de tacrolimus en hidroxipropilmetilcelulosa.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Ung&uuml;ento: </i>1 g de pomada al 0.1% y 0.03% contienen 1 mg y 0.3 mg de tacrolimus monohidratado respectivamente, en aceite mineral, parafina, propilencarbonato, petrolato y cera blanca.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Mecanismo de acci&oacute;n</i></font></p>     <p align="justify"><font face="verdana" size="2">El tacrolimus inhibe la activaci&oacute;n de los linfocitos&#150;T al unirse a la prote&iacute;na intracelular FKBP12 (prote&iacute;na fijadora de FK 12). Se forma un complejo tacrolimus&#150;FKBP12, calcio, calmodulina y calcineurina que subsecuentemente inhibe la actividad fosfatasa de la calcineurina y previene la fosforilaci&oacute;n y translocaci&oacute;n del factor nuclear de c&eacute;lulas T activadas (NFAT), un componente nuclear que inicia la transcripci&oacute;n de genes de linfocinas tales como interleucina 2 (IL&#150;2) e interfer&oacute;n gama</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>M&eacute;todos de determinaci&oacute;n</i></font></p>     <p align="justify"><font face="verdana" size="2">Los par&aacute;metros farmacocin&eacute;ticos del tacrolimus dependen de la matriz que se emplee para su determinaci&oacute;n, ya que existe diferencia en la concentraci&oacute;n sangre/plasma. Por esto se prefiere la determinaci&oacute;n en sangre total tomada en tubo con EDTA. El tacrolimus es estable en sangre total aproximadamente un a&ntilde;o a &#150;70&deg; C, por al menos dos semanas a 4&deg; C y 22&deg; C y al menos dos a tres d&iacute;as a 37&deg; C.<sup>5</sup></font></p>     <p align="justify"><font face="verdana" size="2">El m&eacute;todo que con mayor frecuencia se utiliza en la pr&aacute;ctica cl&iacute;nica cotidiana es el MEIA (inmunoensayo de micropart&iacute;culas ligado a enzima). La especificidad anal&iacute;tica depende del anticuerpo y de las condiciones preanal&iacute;ticas (modo de extracci&oacute;n, volumen y tipo de precipitante, pH). Ninguno de los anticuerpos empleados en MEIA es espec&iacute;fico para el compuesto original y todos tienen reacci&oacute;n cruzada con diversos metabolitos. Tambi&eacute;n se ha empleado el inmunoensayo enzim&aacute;tico multiplicado cuantitativo (EMIT), ambos m&eacute;todos tienen un valor diagn&oacute;stico similar.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2">Recientemente se dio a conocer otro m&eacute;todo, el de cromatograf&iacute;a l&iacute;quida de alta presi&oacute;n (HPLC) acoplado a masas que podr&iacute;a ser intercambiable con el MEIA, es exacto y muy pr&aacute;ctico, ya que puede leer muestras de sangre tomada de la punta del dedo de la mano; sin embargo su costo es a&uacute;n demasiado alto.<sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Farmacocin&eacute;tica</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>Absorci&oacute;n. </i>El tacrolimus se absorbe r&aacute;pidamente, alcanzando el pico m&aacute;ximo en 0.5&#150;1 hora, sin embargo algunos pacientes con trasplante hep&aacute;tico pueden tener el pico a las dos horas.<sup>8</sup> En la absorci&oacute;n influye la baja solubilidad del medicamento y la motilidad gastrointestinal. La biodisponibilidad es pobre y muy variable, de 4&#150;89% (=25%) y se ve reducida en presencia de alimentos, por esto se recomienda administrar en forma consistente ya sea en ayunas o con el mismo tipo de alimentos. Esta variabilidad se ha visto en diversas poblaciones de pacientes sin importar el tipo de &oacute;rgano trasplantado.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>Distribuci&oacute;n. </i>Se distribuye en la mayor&iacute;a de los tejidos. Atraviesa la placenta con concentraciones en plasma del cord&oacute;n umbilical de un tercio de las encontradas en el plasma materno y se encuentra presente en la leche materna en niveles similares a los reportados en plasma.<sup>9</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se sabe que la distribuci&oacute;n de tacrolimus depende parcialmente de la uni&oacute;n reversible a prote&iacute;nas del plasma (alb&uacute;mina, &alpha;<sub>1</sub>&#150; glicoprote&iacute;na) y al hemat&oacute;crito. Las concentraciones plasm&aacute;ticas de alb&uacute;mina y &alpha;<sub>1</sub>glicoprote&iacute;na as&iacute; como el conteo de eritrocitos se incrementan levemente durante los primeros meses post&#150;trasplante y pueden contribuir a alteraciones en la fracci&oacute;n libre de tacrolimus en plasma y por lo tanto a la distribuci&oacute;n y eliminaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Metabolismo. </i>Se lleva a cabo v&iacute;a el citocromo CYP 3 A4 intestinal y hep&aacute;tico siendo la hidroxilaci&oacute;n y la desmetilaci&oacute;n las principales rutas metab&oacute;licas. Se han detectado por lo menos 15 metabolitos, siendo los principales el 13&#150;O&#150;desmetil y 15&#150;O&#150;desmetil tacrolimus.<sup>4</sup> Ninguno de ellos presenta efecto inmunosupresor apreciable en humanos.</font></p>     <p align="justify"><font face="verdana" size="2">El tacrolimus tambi&eacute;n es sustrato de la glicoprote&iacute;na P (P&#150;gp), producto del gen de resistencia a f&aacute;rmacos (MDR1). La P&#150;gp es una bomba de salida dependiente de adenosintrifosfato (ATP) que contribuye a la protecci&oacute;n del cuerpo de toxinas ambientales, limitando su absorci&oacute;n a partir del lumen gastrointestinal o incrementando su excreci&oacute;n biliar y urinaria. Varios estudios han reportado que la farmacocin&eacute;tica de tacrolimus est&aacute; inversamente relacionada con la cantidad de MDR1 en el intestino.<sup>10,</sup><sup>12</sup> Existe una biodisponibilidad reducida en pacientes con actividad anormalmente alta de P&#150;gp intestinal<sup>10</sup> y se ha reportado una biodisponibilidad incrementada en pacientes pedi&aacute;tricos con trasplante hep&aacute;tico, que cursaron con episodios diarreicos relacionados con supresi&oacute;n de CYP3A y P&#150;gp debida a citocinas liberadas por virus o bacterias lo que increment&oacute; la absorci&oacute;n.<sup>13 </sup>Estudios recientes sugieren que gran parte de la variabilidad asociada con tacrolimus es debida a diferencias gen&eacute;ticas en la expresi&oacute;n de CYP3A4 y P&#150;gp,<sup>14</sup> esto incluye las diferencias &eacute;tnicas, ya que existe evidencia de que afroamericanos y latinos tienen menor biodisponibilidad de tacrolimus que los cauc&aacute;sicos.<sup>15</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>Excreci&oacute;n. </i>La vida media de eliminaci&oacute;n var&iacute;a de 12&#150;19 horas.<sup>16</sup> La principal v&iacute;a de eliminaci&oacute;n es la biliar (m&aacute;s de 90% de la dosis de tacrolimus se elimina en la bilis) y menos de 1% de la dosis es excretada inalterada en la orina.<sup>4,</sup><sup>17</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Farmacocin&eacute;tica en pacientes pedi&aacute;tricos </i></font></p>     <p align="justify"><font face="verdana" size="2">Dado que la poblaci&oacute;n pedi&aacute;trica se distingue por numerosas diferencias fisiol&oacute;gicas relacionadas con la composici&oacute;n corporal (relaci&oacute;n agua/grasa), prote&iacute;nas plasm&aacute;ticas y actividad metab&oacute;lica, el comportamiento farmacocin&eacute;tico del tacrolimus es diferente en esta poblaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">Las rutas oxidativas catalizadas por el sistema enzim&aacute;tico del citocromo P 450 est&aacute;n inmaduras durante los primeros meses de vida y necesitan de 6 a 12 meses para alcanzar una actividad metab&oacute;lica importante, la cual a esa edad podr&iacute;a ser m&aacute;s alta que el promedio de actividad en los adultos. Esta maduraci&oacute;n gradual de la actividad de numerosos sistemas enzim&aacute;ticos durante los primeros meses de vida contribuye significativamente a la gran variabilidad interindividual en la velocidad de eliminaci&oacute;n en pacientes pedi&aacute;tricos de diferentes edades.<sup>18</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Algunos estudios han reportado que los ni&ntilde;os requieren de dosis hasta cinco veces m&aacute;s altas para alcanzar concentraciones similares a las de los adultos.<sup>19</sup> Las diferencias en las dosis administradas en pacientes pedi&aacute;tricos y adultos para alcanzar concentraciones m&iacute;nimas comparables en sangre, se explica por las diferencias en depuraci&oacute;n y distribuci&oacute;n,<sup>20</sup> ya que la depuraci&oacute;n del tacrolimus en ni&ntilde;os es m&aacute;s r&aacute;pida y tienen un mayor volumen de distribuci&oacute;n (<a href="#c1">Cuadro 1</a>).</font></p>     <p align="center"><font face="verdana" size="2"><a name="c1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v63n4/a10c1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Efectos adversos y toxicidad</i></font></p>     <p align="justify"><font face="verdana" size="2">Las reacciones adversas m&aacute;s frecuentes del tacrolimus v&iacute;a oral e intravenoso son temblor, cefalea, diarrea, n&aacute;usea, parestesias, dispepsia e hipertensi&oacute;n. Cuando se administra en forma t&oacute;pica puede presentarse sensaci&oacute;n de quemaz&oacute;n y picor, enrojecimiento, dolor, sensaci&oacute;n de calor, aumento de la sensibilidad de la piel (calor y fr&iacute;o), hormigueo, exantema, foliculitis e infecciones virales, acn&eacute;, dolor de cabeza y dermatitis tipo ros&aacute;cea.</font></p>     <p align="justify"><font face="verdana" size="2">Los efectos adversos y toxicidad se detallan en el <a href="/img/revistas/bmim/v63n4/a10c2.jpg" target="_blank">cuadro 2</a>, generalmente mejoran al disminuir la dosis, tambi&eacute;n puede ayudar cambiar a un intervalo de dosificaci&oacute;n de cada ocho horas en vez de cada 12 horas, manteniendo la misma dosis en mg/kg/d&iacute;a para evitar los picos elevados de concentraci&oacute;n que son los que se han asociado con toxicidad,<sup>21</sup>&#150;<sup>22</sup> cuando los efectos adversos comprometen la rehabilitaci&oacute;n del paciente como en el caso de diabetes mellitus, se ha recomendado el cambio a otro esquema de inmunosupresi&oacute;n &#150;por ejemplo ciclosporina.</font></p>     <p align="justify"><font face="verdana" size="2">En pacientes con trasplante renal cobra particular inter&eacute;s la nefrotoxicidad, que puede manifestarse como trastornos tubulares incluyendo acidosis tubular renal<sup>23</sup> hasta la falla renal aguda con disminuci&oacute;n de la velocidad de filtraci&oacute;n glomerular y retenci&oacute;n de azoados, generalmente la nefrotoxicidad mejora al disminuir o suspender el medicamento. Se ha propuesto el uso de teofilina en los casos de insuficiencia renal aguda olig&uacute;rica que no responde al uso de diur&eacute;ticos. Tambi&eacute;n se ha propuesto el uso de fenobarbital, como inductor enzim&aacute;tico en casos de intoxicaci&oacute;n por tacrolimus.<sup>24</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Interacciones medicamentosas</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El tacrolimus puede interactuar con otros f&aacute;rmacos inductores e inhibidores del CYP3 A4<sup>24,39</sup> y as&iacute; disminuir o aumentar su biodisponibilidad, algunos medicamentos pueden incrementar el riesgo de nefrotoxicidad (<a href="#c3">Cuadro 3</a>).</font></p>     <p align="center"><font face="verdana" size="2"><a name="c3"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v63n4/a10c3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Influencia del tiempo post'trasplante </i></font></p>     <p align="justify"><font face="verdana" size="2">Varios estudios en adultos han reportado una disminuci&oacute;n en la dosis de tacrolimus requerida para mantener concentraciones m&iacute;nimas similares al incrementarse el tiempo post&#150;trasplante. Entre ellos se encontr&oacute; en 50 adultos trasplantados reducci&oacute;n de las proporciones dosis/concentraci&oacute;n de tacrolimus despu&eacute;s del primero y tercer mes de tratamiento. A los dos a&ntilde;os la disminuci&oacute;n de la dosis de tacrolimus fue reducida hasta 50%, las razones postuladas para esto son biodisponibilidad incrementada, reducci&oacute;n en la dosis de corticosteroides y concentraciones incrementadas de hemat&oacute;crito y alb&uacute;mina.<sup>40&#150;</sup><sup>42</sup> En el caso de ni&ntilde;os esta influencia no est&aacute; del todo clara ya que en un estudio retrospectivo con pacientes con trasplante de h&iacute;gado, la dosis de tacrolimus en el primer mes de trasplante fue mayor que la requerida tres a cinco a&ntilde;os despu&eacute;s; mientras que otros investigadores no han observado cambios significativos en el primer a&ntilde;o.<sup>19</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Monitoreo terap&eacute;utico</i></font></p>     <p align="justify"><font face="verdana" size="2">Actualmente el monitoreo terap&eacute;utico del tacrolimus se lleva a cabo midiendo las concentraciones m&iacute;nimas tambi&eacute;n conocidas como niveles en valle; sin embargo, esto ha sido cuestionado al presentarse algunos casos de toxicidad y rechazo a&uacute;n cuando las concentraciones m&iacute;nimas estaban dentro del l&iacute;mite considerado como aceptable. Diversos estudios<sup>43&#150;</sup><sup>47</sup> han demostrado que existe buena correlaci&oacute;n entre la concentraci&oacute;n en sangre y el &aacute;rea bajo la curva de concentraci&oacute;n plasm&aacute;tica <i>vs </i>tiempo (ABC), y que dicha correlaci&oacute;n se puede mejorar mediante el uso de diferentes tiempos de muestreo. Puede darse el caso de que el r&eacute;gimen de muestreo &oacute;ptimo variara de acuerdo al tipo de trasplante, tiempo post&#150;trasplante u otros factores.</font></p>     <p align="justify"><font face="verdana" size="2">En pacientes con trasplante renal despu&eacute;s de una dosis promedio de tacrolimus de 0.16 mg/kg/ d&iacute;a, el ABC fue de 104 mg*h/L, mientras que en trasplante hep&aacute;tico, con una dosis promedio de 0.3 mg/kg/d&iacute;a, el ABC fue de 252 mg*h/L. Se ha encontrado correlaci&oacute;n entre ABC y la concentraci&oacute;n m&iacute;nima de tacrolimus en sangre total (Cmin) despu&eacute;s de la primera dosis oral (r =0.90) y el estado estacionario (r =0.83), lo que sugiere que la Cmin de tacrolimus es un buen indicador de la exposici&oacute;n sist&eacute;mica. En pacientes con trasplante hep&aacute;tico la depuraci&oacute;n parece incremen' tarse con el tiempo: para un ni&ntilde;o de 5 kg la depuraci&oacute;n se incrementa de 0.163 (en el d&iacute;a 0) a 0.223 L/h/kg (en el d&iacute;a 60), lo cual significa que podr&iacute;a ser necesario en ciertos pacientes pedi&aacute;tricos incrementar gradualmente la dosis de tacrolimus despu&eacute;s del trasplante. En tanto que puede disminuir cuando se presenta infecci&oacute;n por hepatitis C.<sup>17 </sup>En trasplante de pulm&oacute;n se ha propuesto cuantificar al menos dos puntos entre cero y cuatro horas, para una estimaci&oacute;n adecuada de ABC.<sup>48</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los niveles en valle objetivo de tacrolimus var&iacute;an de acuerdo al tipo de trasplante, tiempo post&#150;trasplante y si se emplean otros inmunosupresores (<a href="/img/revistas/bmim/v63n4/a10c4.jpg" target="_blank">Cuadro 4</a>).<sup>49</sup> En pacientes con trasplante renal tambi&eacute;n se emplea como terapia de rescate para el rechazo resistente a esteroides.</font></p>     <p align="justify"><font face="verdana" size="2">En el caso de pacientes con trasplante de coraz&oacute;n se ha reportado que la incidencia de rechazo agudo es menor cuando los niveles en valle de tacrolimus el primer mes post&#150;trasplante son mayores a 8 ng/mL.<sup>50</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>Modelos de muestreo limitado en pacientes pedi&aacute;tricos </i>Actualmente no existen reportes de modelos de muestreo limitado de tacrolimus en pacientes pedi&aacute;tricos tal y como lo existe para ciclosporina.<sup>51 </sup>Varios estudios realizados en adultos han propuesto algoritmos de muestreo limitado para predecir el &aacute;rea bajo la curva a las 12 horas (ABC<sub>12</sub>). Entre ellos un estudio de 12 pacientes con trasplante de h&iacute;gado en donde se calcul&oacute; el ABC con cuatro puntos (1, 2.5, 6 y 9 horas) encontr&aacute;ndose una r<sup>2 </sup>de 0.99 o una con tres puntos (1, 4 y 12 horas) con una r<sup>2</sup> de 0.92 que predijo mejor el ABC<sub>12</sub>.<sup>52 </sup>En tanto que en un estudio con pacientes con trasplante renal el ABC<sub>12</sub> fue mejor predicha usando algoritmos que incluyeron tiempos de muestreo de cinco horas (C<sub>5</sub>) con r<sup>2</sup>de 0.915, una combinaci&oacute;n de 5 (C<sub>5</sub>) y dos horas (C<sub>2</sub>) con r<sup>2</sup> de 0.983 y una combinaci&oacute;n de cinco (C<sub>5</sub>), dos (C<sub>2</sub>) y una horas <i>(</i>C<sub>1</sub> con r<sup>2</sup> de 0.997,<sup>53</sup> tambi&eacute;n se ha propuesto el monitoreo del ABC <sub>0</sub> <sub>h</sub> del tacrolimus durante el per&iacute;odo de inducci&oacute;n despu&eacute;s del trasplante renal.<sup>54</sup> No se ha encontrado correlaci&oacute;n entre la dosis por superficie de &aacute;rea corporal y el ABC (r<sup>2</sup> =0.098) en ni&ntilde;os bajo tratamiento con tacrolimus, pero s&iacute; hay una buena correlaci&oacute;n entre el ABC y la concentraci&oacute;n a las dos horas C2 (r =0.8573), cuatro horas C4 (r =0.9120), y a las seis horas (r =0.9034).<sup>55</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Uso en padecimientos diferentes del trasplante de &oacute;rganos s&oacute;lidos</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Artritis reumatoide. </i>Recientemente se llev&oacute; a cabo un estudio multic&eacute;ntrico, doble ciego fase IV donde se evalu&oacute; el tacrolimus como monoterapia <i>versus </i>placebo durante seis meses, obteniendo mejor respuesta en los pacientes que hab&iacute;an mostrado intolerancia a los f&aacute;rmacos antirreum&aacute;ticos que los que hab&iacute;an mostrado resistencia a &eacute;stos.<sup>56</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>S&iacute;ndrome nefr&oacute;tico corticorresistente. </i>El tacrolimus se ha empleado con &eacute;xito en series peque&ntilde;as de ni&ntilde;os y adultos con s&iacute;ndrome nefr&oacute;tico resistente al tratamiento con esteroides. Loeffler y col.<sup>57</sup> estudiaron 16 ni&ntilde;os que recibieron tacrolimus a dosis de 0.1 mg/kg/d&iacute;a dividido en dos dosis, obteniendo 81% de remisi&oacute;n completa en los primeros dos meses post&#150;tratamiento y 13.4% de remisi&oacute;n parcial. Se requieren m&aacute;s estudios para determinar si en realidad es menos t&oacute;xico que la ciclosporina y cu&aacute;l es la evoluci&oacute;n a largo plazo de los pacientes tratados con esta terapia.<sup>58&#150;</sup><sup>60</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>Lupus eritematoso. </i>Recientemente se public&oacute; un estudio piloto en nueve pacientes con nefropat&iacute;a l&uacute;pica clase IV que recibieron tratamiento con tacrolimus y prednisolona por seis meses, con remisi&oacute;n completa de la proteinuria en 67% y parcial en 13%, sin embargo a&uacute;n queda por definir el tiempo de tratamiento y si los resultados son comparables a la terapia est&aacute;ndar que consiste en ciclofosfamida y esteroides,<sup>61</sup> se considera una buena alternativa terap&eacute;utica cuando los pacientes no pueden recibir el tratamiento convencional.<sup>62</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>Padecimientos dermatol&oacute;gicos. </i>El tacrolimus t&oacute;pico ha resultado &uacute;til en el manejo de una gran variedad de enfermedades de la piel entre las que destaca la dermatitis at&oacute;pica;<sup>63,</sup><sup>64</sup> Koo y col.<sup>65</sup> reportaron recientemente los resultados obtenidos en 8 <i>000 </i>pacientes con esta enfermedad tratados con tacrolimus al 0.3 y 0.1% dos veces al d&iacute;a, encontrando una disminuci&oacute;n de 52% del &aacute;rea afectada al mes de tratamiento y de 91% a los 18 meses, ofreciendo una alternativa terap&eacute;utica en pacientes pedi&aacute;tricos.<sup>66</sup></font></p>     <p align="justify"><font face="verdana" size="2">Tambi&eacute;n se ha empleado para tratamiento de vit&iacute;ligo en ni&ntilde;os con respuesta que var&iacute;a de 63 a 89% dependiendo del sitio afectado, la concentraci&oacute;n de tacrolimus empleada y el tiempo de tratamiento.<sup>67,</sup><sup>68</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Existen reportes de su utilidad en el tratamiento de psoriasis cuando se combina el tacrolimus al 0.1% con gel de &aacute;cido salic&iacute;lico al 6%.<sup>69</sup>En ni&ntilde;os existe un estudio de casos retrospectivo en donde se evalu&oacute; la eficacia de tacrolimus 0.1% en psoriasis inversa, en donde 12 de 13 pacientes tuvieron una limpieza completa de sus lesiones dos semanas despu&eacute;s de iniciar el tratamiento.<sup>70</sup></font></p>     <p align="justify"><font face="verdana" size="2">Tambi&eacute;n se ha empleado en pacientes con dermatitis de contacto,<sup>71</sup> ros&aacute;cea,<sup>72</sup><sup>,73</sup> dermatitis seborreica<sup>74,</sup><sup>75</sup> y liquen plano.<sup>76</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>     <p align="justify"><font face="verdana" size="2">El tacrolimus es un potente inmunosupresor que ha demostrado su utilidad en diversos padecimientos pedi&aacute;tricos entre los que destacan los trasplantes de &oacute;rganos s&oacute;lidos y la dermatitis at&oacute;pica. Por su estrecho margen de seguridad se recomienda el monitoreo terap&eacute;utico con la determinaci&oacute;n de los niveles en valle en sangre total. Los ni&ntilde;os tienen mayor variabilidad farmacocin&eacute;tica que los adultos, probablemente relacionada a las diferencias en depuraci&oacute;n hep&aacute;tica seg&uacute;n el grupo de edad, y en general requieren mayor dosis en mg/ kg para obtener valores sangu&iacute;neos similares a los del adulto. Se requieren m&aacute;s estudios farmacocin&eacute;ticos en este grupo de edad.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Pollock&#150;Barziv SM, Dipchand Al, McCrindle BW, Nalli N, West LJ. 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