<?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>0034-7531</journal-id>
<journal-title><![CDATA[Revista Cubana de Pediatría]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Pediatr]]></abbrev-journal-title>
<issn>0034-7531</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75312010000100010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Antiepilépticos de tercera generación]]></article-title>
<article-title xml:lang="en"><![CDATA[Third generation antiepilectics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pozo Lauzán]]></surname>
<given-names><![CDATA[Desiderio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pozo Alonso]]></surname>
<given-names><![CDATA[Albia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Pediátrico Universitario William Soler Departamento de Neuropediatría ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2010</year>
</pub-date>
<volume>82</volume>
<numero>1</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75312010000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75312010000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75312010000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Existen numerosos fármacos antiepilépticos de primera y segunda generación, disponibles hoy en el mercado internacional y en Cuba. Sin embargo, no todos resultan satisfactorios para el control de las crisis, debido a dificultades de tolerancia y toxicidad, y a sus propiedades farmacocinéticas. Se ofrece una revisión sobre los principales medicamentos antiepilépticos de tercera generación que en años recientes han sido investigados, para aumentar su eficacia y minimizar sus efectos colaterales, e introducidos en el arsenal terapéutico. Algunos fármacos continúan sometidos a ensayos experimentales y clínicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[There are many first and second generation antiepilectic drugs available in the international marked and also in Cuba. However, not all are satisfactory for the crisis control due to difficulties of tolerance and toxicity, and to its pharmacokinetic properties. Authors offer a review on the main three generation antiepilectic drugs that in past years have been researched to increase its effectiveness and to minimize its side effects, and entered in the therapeutical array. Some drugs underwent clinical and experimental trials.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Antiepilépticos de tercera generación]]></kwd>
<kwd lng="es"><![CDATA[epilepsia refractaria]]></kwd>
<kwd lng="es"><![CDATA[eficacia antiepiléptica]]></kwd>
<kwd lng="en"><![CDATA[Third generation antiepilectics]]></kwd>
<kwd lng="en"><![CDATA[refractory epilepsy]]></kwd>
<kwd lng="en"><![CDATA[antiepilectic effectiveness]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="right"><font size="2" face="verdana"><B>TRABAJOS DE REVISI&Oacute;N    </B></font> </div>     <P ALIGN="left"><font face="verdana">    <br>       <br>       <br>       <br>   <font size="2"><b><font size="4">Antiepil&eacute;pticos de tercera generaci&oacute;n    </font> </b></font></font>      <P ALIGN="left"><font face="verdana">    <br>       <br>   <font size="2"><b><font size="3">Third generation antiepilectics </font> </b></font></font>      <P ALIGN="left"><font face="verdana">    ]]></body>
<body><![CDATA[<br>       <br>       <br>       <br>   <font size="2"><b>Desiderio Pozo Lauz&aacute;n,<SUP>I </SUP>Albia Pozo Alonso    <SUP>II</SUP></b></font></font>      <P ALIGN="left"><font size="2" face="verdana"><SUP>I</SUP>Doctor en Ciencias M&eacute;dicas.    Especialista de II Grado en Neurolog&iacute;a y Pediatr&iacute;a. Profesor Titular    y Consultante. Departamento de Neuropediatr&iacute;a, Hospital Pedi&aacute;trico    Universitario &#171;William Soler&#187;. La Habana, Cuba. </font> <font face="verdana">    <br>   <font size="2"><SUP>II</SUP>Doctora en Ciencias M&eacute;dicas. Especialista    de II Grado en Pediatr&iacute;a y Neurolog&iacute;a. Profesora Auxiliar. Investigadora    Auxiliar. Departamento de Neuropediatr&iacute;a, Hospital Pedi&aacute;trico    Universitario &#171;William Soler&#187;. La Habana, Cuba. </font></font>      <P ALIGN="left"><font face="verdana">    <br>       <br>       <br>       ]]></body>
<body><![CDATA[<br>   </font> <hr size="1" noshade>     <P ALIGN="left"><font size="2" face="verdana"><B>RESUMEN</B> </font>      <P ALIGN="left"><font size="2" face="verdana">Existen numerosos f&aacute;rmacos    antiepil&eacute;pticos de primera y segunda generaci&oacute;n, disponibles hoy    en el mercado internacional y en Cuba. Sin embargo, no todos resultan satisfactorios    para el control de las crisis, debido a dificultades de tolerancia y toxicidad,    y a sus propiedades farmacocin&eacute;ticas. Se ofrece una revisi&oacute;n sobre    los principales medicamentos antiepil&eacute;pticos de tercera generaci&oacute;n    que en a&ntilde;os recientes han sido investigados, para aumentar su eficacia    y minimizar sus efectos colaterales, e introducidos en el arsenal terap&eacute;utico.    Algunos f&aacute;rmacos contin&uacute;an sometidos a ensayos experimentales    y cl&iacute;nicos. </font>      <P ALIGN="left"><font size="2" face="verdana"><B>Palabras clave:</B> Antiepil&eacute;pticos    de tercera generaci&oacute;n, epilepsia refractaria, eficacia antiepil&eacute;ptica.    </font>  <hr size="1" noshade>     <P ALIGN="left"><font size="2" face="verdana"><B>ABSTRACT</B> </font>      <P ALIGN="left"><font size="2" face="verdana">There are many first and second    generation antiepilectic drugs available in the international marked and also    in Cuba. However, not all are satisfactory for the crisis control due to difficulties    of tolerance and toxicity, and to its pharmacokinetic properties. Authors offer    a review on the main three generation antiepilectic drugs that in past years    have been researched to increase its effectiveness and to minimize its side    effects, and entered in the therapeutical array. Some drugs underwent clinical    and experimental trials. </font>      <P ALIGN="left"><font size="2" face="verdana"><B>Key words</B>: Third generation    antiepilectics, refractory epilepsy, antiepilectic effectiveness. </font>  <hr size="1" noshade>     <P ALIGN="left"><font face="verdana">    <br>       <br>       ]]></body>
<body><![CDATA[<br>       <br>   <font size="3"><B>INTRODUCCI&Oacute;N</B></font></font>      <P ALIGN="left"><font size="2" face="verdana">Un extenso n&uacute;mero de f&aacute;rmacos    antiepil&eacute;pticos se encuentran disponibles en la actualidad en el mercado    mundial. Sin embargo, no todos son satisfactorios en relaci&oacute;n con su    eficacia cl&iacute;nica, tolerancia, toxicidad y a sus propiedades farmacocin&eacute;ticas.    </font>      <P ALIGN="left"><font size="2" face="verdana">La incidencia de la epilepsia refractaria    ha continuado entre el 30 y el 40 %, a pesar de la introducci&oacute;n de varios    antiepil&eacute;pticos de segunda generaci&oacute;n a partir del decenio de    1990.<SUP>1</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Recientemente han sido estudiados    y contin&uacute;an en investigaci&oacute;n nuevos f&aacute;rmacos, con el objetivo    de aumentar la eficacia y la tolerancia de los medicamentos antiepil&eacute;pticos.    A lo anterior debe acompa&ntilde;ar una mejor&iacute;a en sus propiedades farmacocin&eacute;ticas.    </font>      <P ALIGN="left"><font size="2" face="verdana">Algunos de estos medicamentos se    recomiendan solamente en los adultos, pero se espera que en el futuro se incluyan    tambi&eacute;n en la terap&eacute;utica de los ni&ntilde;os, como ocurri&oacute;    con los medicamentos antiepil&eacute;pticos de segunda generaci&oacute;n. </font>      <P ALIGN="left"><font size="2" face="verdana">Existen 3 t&eacute;cnicas diferentes    utilizadas para investigar los nuevos antiepil&eacute;pticos.<SUP>1</SUP> El    primer m&eacute;todo se basa en modificaciones qu&iacute;micas o estructurales    de los actuales medicamentos. El segundo m&eacute;todo est&aacute; basado en    el chequeo inicial de numerosas sustancias qu&iacute;micas con el objetivo de    la b&uacute;squeda de compuestos con propiedades antiepil&eacute;pticas, en    estudios con modelos experimentales y en el ser humano. El tercer m&eacute;todo    utilizado est&aacute; relacionado con procesos fisiopatol&oacute;gicos que constituyen    la base de la actividad epil&eacute;ptica en el cerebro. </font>      <P ALIGN="left"><font size="2" face="verdana">Algunos compuestos inhiben de forma    selectiva la transmisi&oacute;n en el cerebro y pueden ser potencialmente &uacute;tiles.    </font>      <P ALIGN="left"><font size="2" face="verdana">En algunos de los medicamentos se    utilizan de forma simult&aacute;nea 2 o 3 t&eacute;cnicas, en la b&uacute;squeda    de nuevos f&aacute;rmacos con propiedades antiepil&eacute;pticas.<SUP>1</SUP>    El objetivo de este trabajo es la revisi&oacute;n de los f&aacute;rmacos antiepil&eacute;pticos    de tercera generaci&oacute;n que se encuentran en etapas de investigaci&oacute;n    cl&iacute;nica o cuya investigaci&oacute;n cl&iacute;nica ya est&aacute; finalizada.    </font>      <P ALIGN="left"><font face="verdana">    ]]></body>
<body><![CDATA[<br>       <br>   <font size="3"><B>ALGUNOS DE LOS MEDICAMENTOS DE TERCERA GENERACI&Oacute;N</B></font></font>      <P ALIGN="left"><font size="2" face="verdana">A continuaci&oacute;n se mencionan    algunos de los medicamentos de tercera generaci&oacute;n con su nombre original:    brivaracetam y seletracetam (an&aacute;logos del levetiracetam), pregabalin,    ganaxolone (pertenece a los neuroesteroides), carisbamate y fluorofelbamate    (an&aacute;logo del felbamate), rufinamide, safinamide (inhibe la liberaci&oacute;n    del glutamato), lacosamide, acetato de eslicarbazepine (an&aacute;logo al antiepil&eacute;ptico    oxcarbazepine), (antagonistas del glutamato) como el talampanel. </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Brivaracetam</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Es una prote&iacute;na sint&eacute;tica    estructuralmente relacionada con el levetiracetam.<SUP>2</SUP> Posee efectos    inhibitorios de las corrientes de sodio dependientes de voltaje. Se absorbe    r&aacute;pidamente y casi totalmente a las 2 h, despu&eacute;s de la administraci&oacute;n    oral.<SUP>3</SUP> La vida media es de 7-8 h.<SUP>3</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Menos del 20 % del medicamento se    une a las prote&iacute;nas del plasma.<SUP>4 </SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">El brivaracetam disminuye las concentraciones    plasm&aacute;ticas de la carbamazepina y la fenito&iacute;na.<SUP>2 </SUP>Es    uno de los primeros antiepil&eacute;pticos de tercera generaci&oacute;n cl&iacute;nicamente    efectivo en las crisis parciales refractarias en adultos, como terap&eacute;utica    a&ntilde;adida. Se ha recomendado en una dosis de 50 mg diarios.<SUP>5,6</SUP>    </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Seletracetam</B> </font></font>      ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="verdana">Es un derivado de la pirrolidona,    relacionado estructuralmente al levetiracetam.<SUP>7</SUP> No tiene efectos    en las corrientes de sodio y potasio dependientes de voltaje.<SUP>7</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Se absorbe casi completamente en    el intestino y la biodisponibilidad es alrededor del 92 %. La uni&oacute;n a    las prote&iacute;nas del plasma es del 10 %.<SUP>8</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">La concentraci&oacute;n m&aacute;xima    plasm&aacute;tica se obtiene en la primera hora despu&eacute;s de su administraci&oacute;n    oral. La vida media es de 8 h.<SUP>7</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">En la actualidad se est&aacute;    investigando cl&iacute;nicamente en adultos epil&eacute;pticos con edades entre    18 y 65 a&ntilde;os.<SUP>1</SUP> </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Pregabalin</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Es un derivado del antiepil&eacute;ptico    gabapentin. Aunque est&aacute; relacionado estructuralmente con el &aacute;cido    gammaaminobut&iacute;rico (GABA); no interact&uacute;a ni con los receptores    GABAa o GABAb y no inhibe la degradaci&oacute;n del GABA.<SUP>1</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Se absorbe r&aacute;pidamente en    el intestino con una biodisponibilidad del 90 %. La concentraci&oacute;n plasm&aacute;tica    ocurre una hora despu&eacute;s de la administraci&oacute;n oral. No se une a    las prote&iacute;nas plasm&aacute;ticas y no tiene interacciones con otros f&aacute;rmacos    antiepil&eacute;pticos.<SUP>9</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Aproximadamente el 98 % se elimina    por excreci&oacute;n renal.<SUP>10</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Este medicamento est&aacute; comercializado    internacionalmente. </font>      ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="verdana">Se encontr&oacute; que el 51 % de    pacientes adultos con crisis parciales refractarias mostr&oacute; una respuesta    favorable a una dosis de 800 mg/d&iacute;a (puede dividirse dos veces al dia)    como tratamiento a&ntilde;adido o comedicaci&oacute;n. La dosis m&iacute;nima    efectiva fue de 150 mg/d&iacute;a.<SUP>11</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Actualmente se investiga como monoterapia    y en comedicaci&oacute;n en ni&ntilde;os con epilepsia parcial refractaria.<SUP>1</SUP>    </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Ganaxolone</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Pertenece a la clase de compuestos    denominados neuroesteroides.<SUP>12</SUP> Se ha demostrado buena tolerancia    en ni&ntilde;os y en adultos. Es eficaz en ni&ntilde;os con espasmos infantiles.    La dosis inicial es de<font color="#000000"> 1&#160;mg/(kg&#8729;d&iacute;a)    hasta </font>12&nbsp;mg/(kg&#8729;d&iacute;a).<SUP>13,14</SUP> </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Carisbamate</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Es un derivado del felbamate. Tiene    acciones moleculares que contribuyen a su actividad antiepil&eacute;ptica que    no han sido esclarecidas hasta la actualidad.<SUP>15</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Es r&aacute;pida y casi completamente    absorbido en el intestino con una biodisponibilidad del 95 %. Tiene un pico    de concentraci&oacute;n en 1-3 h.<SUP>16</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">La uni&oacute;n con las prote&iacute;nas    plasm&aacute;ticas es aproximadamente del 44 %.<SUP>17</SUP> Su vida media es    de alrededor de 12 h.<SUP>10</SUP> </font>      ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="verdana">Reduce las concentraciones de &aacute;cido    valproico y de la lamotrigina en el 20 %.<SUP>18 </SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Actualmente se est&aacute;n realizando    evaluaciones cl&iacute;nicas que demuestran buena efectividad y tolerancia en    crisis parciales en el adulto.<SUP>1</SUP> </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Fluorofelbamate</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Este medicamento pertenece a los    carbamatos y se relaciona con el felbamate. En su elaboraci&oacute;n se ha mantenido    la actividad de amplio espectro de aqu&eacute;l.<SUP>1</SUP> Se modific&oacute;    su metabolismo con el objetivo de evitar la producci&oacute;n de un metabolito    del felbamate que se presume produce toxicidad.<SUP>1</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">En la actualidad contin&uacute;a    en desarrollo.<SUP>1</SUP> </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Acetato de eslicarbazepine</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Es un an&aacute;logo del antiepil&eacute;ptico    oxcarbazepine.<SUP>1</SUP> Bloquea los canales de sodio dependientes de voltaje.<SUP>19    </SUP>El pico de la concentraci&oacute;n se obtiene entre 0,5-3 h despu&eacute;s    de la administraci&oacute;n oral del medicamento.<SUP>19</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Se ha planteado que puede ser administrado    en pacientes con ligera o moderada afectaci&oacute;n hep&aacute;tica.<SUP>20</SUP>    </font>      ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="verdana">Su eficacia y seguridad ha sido    probada en adultos, ni&ntilde;os y adolescentes con epilepsia focal refractaria,    en estudios efectuados en Portugal.<SUP>19-21</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">En los ni&ntilde;os, la dosis de    inicio fue de 5 <FONT  COLOR="#000000">mg/(kg&#8729;d&iacute;a) </FONT> durante el primer mes; al segundo    mes de 15 mg/(kg&#8729;d&iacute;a); y al tercer mes se increment&oacute; a 30    mg/(kg&#8729;d&iacute;a).<SUP>19</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">En otro estudio realizado en Portugal,    en adultos, se administraron 800 mg una vez al d&iacute;a.<SUP>20</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana"><B>    <br>   Rufinamide</B> </font>      <P ALIGN="left"><font size="2" face="verdana">Es un derivado triazol. Tiene una    nueva estructura. No tiene relaci&oacute;n con otros antiepil&eacute;pticos.<SUP>22    </SUP>Prolonga el estado inactivo de los canales de sodio dependientes de voltaje.<SUP>1</SUP>    </font>      <P ALIGN="left"><font size="2" face="verdana">En los ni&ntilde;os la administraci&oacute;n    de &aacute;cido valproico eleva las concentraciones de rufinamide; en contraste,    la carbamazepina, el clonazepan, la vigabatrina y el oxcarbazepine no afectan    las concentraciones de este medicamento. </font>      <P ALIGN="left"><font size="2" face="verdana">La biodisponibilidad es del 85 %    despu&eacute;s de su ingesti&oacute;n oral.<SUP>1</SUP> El pico de la concentraci&oacute;n    se obtiene dentro de las 5-6 h y la vida media oscila entre 8-12 h.<SUP>1</SUP>    </font>      <P ALIGN="left"><font size="2" face="verdana">Se recomienda en crisis refractarias    parciales en adultos y ni&ntilde;os y en el s&iacute;ndrome de Lennox-Gastaut.    Es m&aacute;s efectiva en el &uacute;ltimo.<SUP>23,24</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Fue aprobado en la Uni&oacute;n    Europea en el a&ntilde;o 2007, para el tratamiento del s&iacute;ndrome de Lennox-Gastaut.<SUP>22,25</SUP>    </font>      ]]></body>
<body><![CDATA[<P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Safinamide</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Es una monoamida alfa derivada de    la milacemide, inhibidor de la liberaci&oacute;n de glutamato (neurotransmisor    excitatorio).<SUP>26 </SUP>Fue inicialmente sintetizado en Italia.<SUP>27</SUP>    </font>      <P ALIGN="left"><font size="2" face="verdana">Es un medicamento de amplio espectro    y tiene un margen de buena seguridad.<SUP>27</SUP> Act&uacute;a como bloqueador    de los canales de sodio sensitivos a voltaje y de los canales de calcio. Adem&aacute;s    inhibe la liberaci&oacute;n de glutamato.<SUP>27</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Se contin&uacute;an ensayos cl&iacute;nicos    en diferentes tipos de crisis epil&eacute;pticas.<SUP>27,28</SUP> </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Lacosamide</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">El lacosamide, cuyo nombre inicial    fue <I>harkoseride</I>, fue recientemente aprobado en los Estados Unidos de    Norteam&eacute;rica y en la Uni&oacute;n Europea.<SUP>29</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">El mecanismo m&aacute;s relevante    es el aumento de la inactivaci&oacute;n de los canales de sodio dependientes    de voltaje.<SUP>29-31</SUP> Se absorbe de forma r&aacute;pida y total. Tiene    una vida media de 13 h. El 95 % se elimina por la orina.<SUP>29</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">No tiene interacciones cl&iacute;nicas    significativas con otros medicamentos antiepil&eacute;pticos.<SUP>29</SUP> Se    recomienda como comedicaci&oacute;n en la epilepsia parcial refractaria en adultos    en una dosis total diaria que var&iacute;a entre 200 mg y 800 mg, dividida dos    veces al d&iacute;a.<SUP>29,30,32</SUP> </font>      ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="verdana">Existe disponibilidad de una soluci&oacute;n    para la administraci&oacute;n en infusi&oacute;n endovenosa.<SUP>31,33 </SUP>No    se han reportado serios efectos colaterales.<SUP>33</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana"><B>    <br>   Losigamone</B> </font>      <P ALIGN="left"><font size="2" face="verdana">Pertenece al grupo beta-methoxy-butenolides.    Se elimina por oxidaci&oacute;n.<SUP>34</SUP> Act&uacute;a sobre los canales    de sodio, calcio y potasio.<SUP>35</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">En ensayos cl&iacute;nicos se ha    demostrado efectividad satisfactoria y buena tolerancia en el tratamiento de    las crisis refractarias parciales y secundariamente generalizadas en el adulto.<SUP>34</SUP>    </font>      <P ALIGN="left"><font face="verdana">    <br>   <font size="2"><B>Talampanel</B> </font></font>      <P ALIGN="left"><font size="2" face="verdana">Inhibe d&eacute;bilmente los receptores    de tipo kainato.<SUP>36</SUP> La absorci&oacute;n es adecuada.<SUP>1</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">Se une a las prote&iacute;nas plasm&aacute;ticas    entre un 67-88 %.<SUP>37</SUP> Su vida media es de 8 h.<SUP>38</SUP> </font>      <P ALIGN="left"><font size="2" face="verdana">La fenito&iacute;na y la carbamazepina,    que son inductores enzim&aacute;ticos, reducen la concentraci&oacute;n plasm&aacute;tica    del talampanel. Se est&aacute; investigando en adultos con crisis parciales.<SUP>1</SUP>    </font>      ]]></body>
<body><![CDATA[<P ALIGN="left"><font face="verdana">    <br>       <br>   <font size="3"><B>VALORACIONES GENERALES</B></font></font>      <P ALIGN="left"><font size="2" face="verdana">En resumen, el desarrollo de nuevos    f&aacute;rmacos antiepil&eacute;pticos de tercera generaci&oacute;n ha sido    posible gracias a un mayor conocimiento de los mecanismos fisiopatol&oacute;gicos    de la epilepsia. Son necesarios estudios adicionales para confirmar la utilidad    de &eacute;stos. </font>      <P ALIGN="left"><font face="verdana">    <br>       <br>   <font size="3"><B>REFERENCIAS BIBLIOGR&Aacute;FICAS</B></font></font>      <!-- ref --><P ALIGN="left"><font size="2" face="verdana">1. Akk G, Sav HJ, Wang C, Steinbach    JH, Zorumski CF, Covey DF Mennerick S. Neurosteroid access to the GABAa receptor.    J Neurosci 2005;25:11605-13. </font>    <!-- ref --><P ALIGN="left"><font size="2" face="verdana">2. Von Rosenstiel P. Brivaracetam    (UCB34714). 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Pol J Pharmacol 2003;55:675-82. </font>    <!-- ref --><P ALIGN="left"><font size="2" face="verdana">35. Errington AC, Stohr T, Lees    G. Voltage gated ion channel: targets for anticonvulsant drugs. Current Top    Med Chem 2005;5:15-30. </font>    <!-- ref --><P ALIGN="left"><font size="2" face="verdana">36. Solyom S, Tarna I. Non competitive    AMPA antagonist of 2-3 benzodiazepine type. Current Pharma Des 2002;8:913-19.    </font>    <!-- ref --><P ALIGN="left"><font size="2" face="verdana">37. Langan YM, Lucas R, Jewell H,    Toublanc N, Schaefer H, Sander JW. Talampanel, a new antiepileptic drug: single    and multiple doses. Pharmacokinetics and initial 1-week experience in patients    with chronic intractable epilepsy. Epilepsia 2003;44:46-53. </font>    <!-- ref --><P ALIGN="left"><font size="2" face="verdana">38. Bialer M, Johannessen SI, Kupferberg    HJ, Levy RH, Loiseau P, Perucca E. Progress report of new antiepileptic drugs:    a summary of the Sixth Eilat Conference (EILAT VI). Epilepsy Res 2002;51:31-71.    </font>    <P align="left"><font face="verdana">    <br>       <br>       <br>       <br>   <font size="2">Recibido: 9 de diciembre de 2009.</font></font> <font face="verdana">    ]]></body>
<body><![CDATA[<br>   <font size="2">Aprobado: 26 de enero de 2010.</font></font> <font face="verdana">    <br>       <br>       <br>       <br>   <font size="2"><I>Desiderio Pozo Lauz&aacute;n</I>. Hospital Pedi&aacute;trico    Universitario &#171;William Soler&#187;. Departamento de Neuropediatr&iacute;a.    Calle 100 y Perla. CP 10800. Altahabana, Boyeros. La Habana, Cuba. </font></font>    <font face="verdana">    <br>   <font size="2">Correo electr&oacute;nico: <a href="mailto:pozo@infomed.sld.cu">pozo@infomed.sld.cu</a></font></font>       ]]></body><back>
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