<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932011000100004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Epilepsia y desarrollo sexual en adolescentes]]></article-title>
<article-title xml:lang="en"><![CDATA[Epilepsy and sexual development in adolescents]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrizosa Moog]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Departamento de Pediatría y Puericultura ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2011</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<fpage>34</fpage>
<lpage>40</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932011000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932011000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932011000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los efectos de las epilepsias y de los fármacos antiepilépticos en el desarrollo sexual de los adolescentes han sido poco estudiados. Las epilepsias per se pueden alterar los ritmos de secreción de las hormonas del eje hipotálamo-hipofisiario y contribuir a que se altere la evolución puberal. Los fármacos antiepilépticos pueden afectar la talla en ambos sexos y producir cambios en el tamaño testicular y en la longitud del pene. En las mujeres adolescentes existen los riesgos del síndrome de ovario poliquístico y de la epilepsia catamenial. En los hombres se pueden afectar la fertilidad y el desempeño sexual. Es necesario hacer más estudios sobre este asunto, que incluyan los efectos de los nuevos medicamentos anticonvulsivantes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The effects of epilepsies and of antiepileptic drugs on the sexual development of adolescents have been poorly studied. Epilepsy may by itself alter the rhythms of secretion of the hypothalamichypophyseal axis, thus contributing to alter pubertal evolution. Antiepileptic drugs may affect height in both women and men, and produce changes in testicular size and penile length. Adolescent epileptic women are at risk to develop polycystic ovary syndrome and catamenial epilepsy. Fertility and sexual performance may be affected in men. Further studies on this subject are required including those focused on the new antiepileptic drugs.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Adolescente]]></kwd>
<kwd lng="es"><![CDATA[Desarrollo Sexual]]></kwd>
<kwd lng="es"><![CDATA[Epilepsia]]></kwd>
<kwd lng="es"><![CDATA[Hormonas]]></kwd>
<kwd lng="en"><![CDATA[Adolescent]]></kwd>
<kwd lng="en"><![CDATA[Epilepsy]]></kwd>
<kwd lng="en"><![CDATA[Hormones]]></kwd>
<kwd lng="en"><![CDATA[Sexual Development]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p align="center"><font  size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>Epilepsia y desarrollo sexual en adolescentes</b></font></p>     <p>&nbsp;</p>     <p align="center"><font  size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Epilepsy and sexual development in adolescents </b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> Jaime Carrizosa Moog&#42;</b></font></p>     <p>&nbsp;</p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> &#42; Profesor Asistente, Departamento de Pediatr&iacute;a y Puericultura, Universidad de Antioquia, Facultad de Medicina, Medell&iacute;n, Colombia. M&eacute;dico general, Universidad Pontificia Bolivariana, Medell&iacute;n,   Colombia. Neur&oacute;logo Infantil, Universidad de Chile. <a href="mailto:posgrado@medicina.udea.edu.co">posgrado@medicina.udea.edu.co</a>  </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los efectos de las epilepsias y de los f&aacute;rmacos antiepil&eacute;pticos en el desarrollo sexual de los   adolescentes han sido poco estudiados. Las epilepsias per se pueden alterar los ritmos de secreci&oacute;n   de las hormonas del eje hipot&aacute;lamo-hipofisiario y contribuir a que se altere la evoluci&oacute;n puberal. Los   f&aacute;rmacos antiepil&eacute;pticos pueden afectar la talla en ambos sexos y producir cambios en el tama&ntilde;o   testicular y en la longitud del pene. En las mujeres adolescentes existen los riesgos del s&iacute;ndrome de   ovario poliqu&iacute;stico y de la epilepsia catamenial. En los hombres se pueden afectar la fertilidad y el   desempe&ntilde;o sexual. Es necesario hacer m&aacute;s estudios sobre este asunto, que incluyan los efectos de   los nuevos medicamentos anticonvulsivantes.   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>PALABRAS CLAVE</b></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> <i>Adolescente, Desarrollo Sexual, Epilepsia, Hormonas</i>   </font></p> <hr size="1">     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> The effects of epilepsies and of antiepileptic drugs on the sexual development of adolescents have   been poorly studied. Epilepsy may by itself alter the rhythms of secretion of the hypothalamichypophyseal   axis, thus contributing to alter pubertal evolution. Antiepileptic drugs may affect height   in both women and men, and produce changes in testicular size and penile length. Adolescent   epileptic women are at risk to develop polycystic ovary syndrome and catamenial epilepsy. Fertility   and sexual performance may be affected in men. Further studies on this subject are required including   those focused on the new antiepileptic drugs.</font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> KEY WORDS</b>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>Adolescent, Epilepsy, Hormones, Sexual Development</i></font></p> <hr size="1">     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p>     <p><font  size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> INTRODUCCI&Oacute;N</b></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Existen muchos estudios sobre los efectos de la epilepsia   y de los f&aacute;rmacos antiepil&eacute;pticos en los ciclos menstruales   y el embarazo; son menos frecuentes los art&iacute;culos que   hacen referencia a los efectos en los hombres y,   finalmente, son escasos los estudios en adolescentes.   Dado que la adolescencia es un per&iacute;odo cr&iacute;tico en el   desarrollo f&iacute;sico y sexual, es posible que tanto la epilepsia   por s&iacute; misma, como el efecto de algunos de los   medicamentos puedan interferir con el desenlace normal   de este proceso. Se pretende en este art&iacute;culo revisar la   evidencia disponible sobre este asunto, que afecta a una   gran parte de la poblaci&oacute;n con epilepsia.   </font></p>     <p>&nbsp;</p>     <p><font  size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>HORMONAS Y EPILEPSIA</b>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">Tanto la observaci&oacute;n directa en estudios de laboratorio   con animales, como los resultados obtenidos en   seguimientos cl&iacute;nicos en humanos, han demostrado que   las hormonas tienen alg&uacute;n tipo de influencia en la   aparici&oacute;n y el ritmo de las crisis de algunas epilepsias. En   t&eacute;rminos generales se concluye que los estr&oacute;genos son   proconvulsivantes y que los progest&aacute;genos evitan los   episodios comiciales. El efecto inductor de las crisis por   los estr&oacute;genos se explica por los siguientes mecanismos:</font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> 1. Incremento del glutamato por la v&iacute;a del receptor Nmetil   D-aspartato &#40;NMDA&#41;   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">2. Disminuci&oacute;n de la concentraci&oacute;n de dopamina<sup>1</sup>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">3. Incremento anat&oacute;mico de las espinas dendr&iacute;ticas</font></p>     ]]></body>
<body><![CDATA[<p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> 4. Aumento del contacto intercelular   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">5. Promoci&oacute;n de la hipersincronizaci&oacute;n</font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> 6. Facilitaci&oacute;n del efecto <i>kindling</i><a name="1a" id="1a"></a><a href="#1">&#42;</a> del hipocampo de la   am&iacute;gdala</font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> 7. Incremento de los potenciales postsin&aacute;pticos en las   c&eacute;lulas piramidales CA1<sup>2</sup>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">Para la protecci&oacute;n de ataques epil&eacute;pticos que se ha   observado con la progesterona se han propuesto los   siguientes mecanismos:</font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> 1. Efecto ansiol&iacute;tico   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">2. Efecto sedante   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">3. Su metabolito allopregnanolona tiene un efecto   modulador del GABA<sup>3,4</sup>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">Por otra parte el efecto de la testosterona es de car&aacute;cter   dual: es un proconvulsivante debido a su aromatizaci&oacute;n   a 17-&beta;-estradiol y por otra parte su reducci&oacute;n a 3-&alpha;-   androstanediol tiene un efecto sobre el GABA. Es posible   que un solo mecanismo no explique todo el potencial   inductor o disparador de las crisis en la epilepsia, sino   que se trate de un balance de fuerzas donde se miden los   diferentes efectos descritos. No obstante, vale la pena   resaltar que la allopregnanolona tiene un efecto   modulador agonista del receptor GABA-A mil veces   mayor que el del pentobarbital y mayor que la   benzodiacepina m&aacute;s potente, el nitroflurazepam.<sup>5</sup></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Tanto la epilepsia como los f&aacute;rmacos antiepil&eacute;pticos &#40;FAE&#41;   pueden interferir en el equilibrio natural de estas   hormonas provocando alteraciones en el desarrollo   sexual de los adolescentes.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font  size="3" face="Verdana, Arial, Helvetica, sans-serif"> <b>EPILEPSIA Y DESARROLLO SEXUAL</b></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Es posible que el desarrollo sexual de los adolescentes   con epilepsia se vea afectado tanto por las caracter&iacute;sticas   de la enfermedad como por los efectos de los f&aacute;rmacos   prescritos para prevenir las crisis. Es muy dif&iacute;cil   determinar cu&aacute;l es la importancia relativa de cada una   de estas variables, debido a que no ser&iacute;a &eacute;tico dejar a los   pacientes sin medicaci&oacute;n, solo para examinar el potencial   de la epilepsia para interferir en el desarrollo f&iacute;sico y   sexual. No obstante, existen estudios que tratan de aclarar   este asunto. Quigg y colaboradores<sup>6</sup> estudiaron la   secreci&oacute;n de hormona luteinizante &#40;LH&#41; en hombres con   epilepsia del l&oacute;bulo temporal compar&aacute;ndola con la de   controles sin epilepsia. Se estudiaron los patrones de   secreci&oacute;n de LH teniendo en cuenta sus ciclos circadiano   y ultradiano y su relaci&oacute;n con los estados interictal y   posictal de los pacientes. El per&iacute;odo normal de secreci&oacute;n   de esta hormona ocurre entre las 0:00 y 4:00 horas de la   madrugada; en las fases interictales de los pacientes dicho   per&iacute;odo se prolong&oacute; hasta las 5:00 a. m. y en los estados   posictales los pulsos de esta hormona se distribuyeron a   lo largo de las 24 horas. La amplitud de los niveles de LH   fue m&aacute;xima entre las 01:00 y 07:00 y m&iacute;nima entre las   13:00 y 19:00 horas del ciclo circadiano de los individuos   controles. En los pacientes no se hallaron las diferencias   descritas en las personas sanas en la amplitud de la secreci&oacute;n, ni en los horarios diurnos o nocturnos de los   pulsos.   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> 	En ancianos sanos, hombres en ayuno prolongado y   hombres obesos se ha informado la p&eacute;rdida de las   oscilaciones y de la amplitud de la secreci&oacute;n de LH. Todas   estas circunstancias tienen en com&uacute;n el presentar   hipogonadotropismo e hipoandrogenemia, como se   observa en algunas personas con epilepsia. Tambi&eacute;n se   han documentado niveles altos de LH en mujeres   adolescentes con epilepsia temporal derecha, que   presentan ciclos anovulatorios, as&iacute; como hipogonadismo   hipogonadotr&oacute;pico y bajo desempe&ntilde;o sexual. Por otra   parte, la epilepsia temporal izquierda se ha relacionado   con el s&iacute;ndrome de ovario poliqu&iacute;stico &#40;SOP&#41;.<sup>7,8</sup> Se infiere   entonces que las descargas el&eacute;ctricas anormales pueden   llevar a una disfunci&oacute;n en el patr&oacute;n de secreci&oacute;n de   hormonas sexuales con las consecuencias cl&iacute;nicas   descritas.</font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Existe la referencia de que las descargas ictales e   interictales, especialmente las del sistema temporol&iacute;mbico,   alteran el sistema de glutamato y &oacute;xido n&iacute;trico,   que es pieza clave en la pulsaci&oacute;n de la hormona   liberadora de gonadotropina &#40;GnRH&#41;. Esta variaci&oacute;n en   los ritmos de secreci&oacute;n de GnRH alterar&iacute;a el eje   hipot&aacute;lamo-pituitaria, llevando a trastornos endocrinos   que afectan la capacidad reproductiva.<sup>9,10</sup> </font></p>     <p>&nbsp;</p>     <p><font  size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>EPILEPSIA EN MUJERES ADOLESCENTES</b></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Se han publicado muchos art&iacute;culos sobre las alteraciones   reproductivas que pueden padecer las mujeres adultas   con epilepsia. El inter&eacute;s en esta poblaci&oacute;n particular   no radica solo en la posible afectaci&oacute;n reproductiva, sino   tambi&eacute;n en las consecuencias graves que pueden sufrir   los embriones y fetos expuestos a los FAE. En las mujeres   con esta enfermedad se han descrito hiperandrogenemia,   epilepsia catamenial, aparici&oacute;n de ovarios   poliqu&iacute;sticos y del s&iacute;ndrome de ovario poliqu&iacute;stico &#40;SOP&#41;,   especialmente con la exposici&oacute;n al &aacute;cido valproico.<sup> 	11-14</sup> Vale la pena conocer desde qu&eacute; edad se presentan estas   alteraciones, si est&aacute;n presentes en las adolescentes, si   tienen caracter&iacute;sticas similares a las de las mujeres adultas   o si difieren en otras variables.</font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Varios grupos de investigaci&oacute;n han estudiado la   hiperandrogenemia en ni&ntilde;as y adolescentes con   epilepsia: Vainionp&#228;&#228;<sup>15</sup> observ&oacute; incremento de los niveles   de andr&oacute;genos en el 38&#37; de las mujeres prep&uacute;beres, 36&#37;   de las p&uacute;beres y 57&#37; de las posp&uacute;beres; los datos hallados   por el grupo de El-Khayat<sup>16</sup> fueron: 25&#37;, 63&#37; y 67&#37;, para   las respectivas edades de desarrollo sexual, y De Vries<sup>17</sup> inform&oacute; un hallazgo similar. Este &uacute;ltimo autor no encontr&oacute;   asociaci&oacute;n entre el incremento de las hormonas   andr&oacute;genas y la presencia de SOP. Estos resultados se   observan predominantemente con la toma de &aacute;cido   valproico. En contraposici&oacute;n al trabajo de De Vries, varios   estudios han logrado demostrar una correlaci&oacute;n de la   hiperandrogenemia asociada al &aacute;cido valproico con las   manifestaciones cl&iacute;nicas del ovario poliqu&iacute;stico.<sup>16,18</sup> Las   hip&oacute;tesis acerca del mecanismo por el cual dicho   antiepil&eacute;ptico produce un aumento de los andr&oacute;genos   son: 1. El &aacute;cido valproico estimula la neurotransmisi&oacute;n   GABA-&eacute;rgica central con posibilidad de influir en los   pulsos de las gonadotrofinas. 2. El mismo medicamento   puede alterar algunos mecanismos mediados por la   insulina, como la reducci&oacute;n de la s&iacute;ntesis de prote&iacute;na   ligadora de hormonas sexuales &#40;SHBG, por la sigla en   ingl&eacute;s de <i>sex hormone binding globulin</i>&#41; y de otras   prote&iacute;nas transportadoras. El d&eacute;ficit de estas prote&iacute;nas   incrementa los niveles de andr&oacute;genos libres y del factor   de crecimiento similar a la insulina <i>&#40;insulin-like factor 1&#41;</i>,   que es a su vez un cofactor para la producci&oacute;n de LH.<sup>19-21</sup>   Los dem&aacute;s medicamentos anticonvulsivantes parecen   no tener mayor influencia sobre los niveles de   andr&oacute;genos, pero con los m&aacute;s nuevos han de esperarse   reportes actualizados. Al comparar el &aacute;cido valproico con   el levetiracetam no se encontraron alteraciones cl&iacute;nicas   ni de laboratorio con el segundo de ellos. Sin embargo,   existe un estudio <i>in vitro</i> que demuestra c&oacute;mo el   levetiracetam puede afectar la funci&oacute;n endocrina en las   c&eacute;lulas del ovario prep&uacute;ber de cerdos.<sup>22,23</sup>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">El SOP es una de las posibles causas de infertilidad en las   mujeres con epilepsia y puede comenzar durante la   adolescencia. El estudio de Mikkonen<sup>18</sup> describe que 63&#37;   de las adolescentes en tratamiento con &aacute;cido valproico   presentaron SOP, frente a 25&#37; de las tratadas con otro   medicamento y 11&#37; de las que no recib&iacute;an medicaci&oacute;n.   Datos similares se encuentran en los estudios de Betts,   Isojarvy y Morell.<sup>24-26</sup> Este &uacute;ltimo autor demostr&oacute; una   alta incidencia de ovarios poliqu&iacute;sticos previa al inicio   del tratamiento con &aacute;cido valproico, lo que hace pensar   que la epilepsia misma podr&iacute;a influir en el desarrollo de   los quistes y que estos se incrementan con el uso de tal   medicamento. Tambi&eacute;n parece que la adolescencia y   una edad menor de 26 a&ntilde;os son per&iacute;odos cr&iacute;ticos para el desarrollo del SOP, en comparaci&oacute;n con mujeres   prep&uacute;beres o mayores de esa edad. Los an&aacute;lisis de El-   Khayat,<sup>16</sup> Luef,<sup>27</sup> Bilo<sup>28</sup> y Polson<sup>29</sup> no lograron demostrar   una asociaci&oacute;n entre la toma del &aacute;cido valproico y la   presencia del SOP.   </font></p>     ]]></body>
<body><![CDATA[<p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">La epilepsia catamenial se present&oacute; en 31&#37; de las 42   adolescentes estudiadas por El-Khayat,<sup>30</sup> porcentaje   similar al informado en mujeres adultas en las   investigaciones de Herzog<sup>31</sup> y Penovich.<sup>32</sup> Las crisis   epil&eacute;pticas se presentaron durante la menstruaci&oacute;n en   el 53,8&#37; y durante la fase l&uacute;tea en el 46,2&#37; de las pacientes;   la disminuci&oacute;n de la progesterona y no el incremento del   estradiol fue la posible causa de la aparici&oacute;n de las crisis.   En cuanto a las medidas antropom&eacute;tricas, se encuentran   en adolescentes epil&eacute;pticas una reducci&oacute;n de la talla con   respecto a los controles de la misma edad y una tendencia   importante a la obesidad, especialmente relacionada con   el &aacute;cido valproico.<sup>16,33,34</sup></font></p>     <p>&nbsp;</p>     <p><font  size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> EPILEPSIA EN HOMBRES ADOLESCENTES</b></font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Es limitada la informaci&oacute;n sobre el efecto de la epilepsia y   de los FAE en el desarrollo sexual de los hombres   adolescentes. En un interesante estudio llevado a cabo en   Egipto,<sup>35</sup> se analizaron los cambios antropom&eacute;tricos y   sexuales y los resultados de los ex&aacute;menes de laboratorio.   En dicha investigaci&oacute;n se hall&oacute; que existe en general   aumento s&eacute;rico de testosterona total, estradiol, FSH, LH y   SHBG &#40;por la sigla en ingl&eacute;s de <i>sex hormone binding globulin</i>&#41;   y que est&aacute;n reducidas la testosterona libre y las relaciones   testosterona/LH y testosterona libre/estradiol. Al comparar   el grupo de pacientes con el de control se encontr&oacute; que el   primero ten&iacute;a, con frecuencias estad&iacute;sticamente   significativas, menores el tama&ntilde;o testicular, la longitud   peneana y la talla, adem&aacute;s de pubarquia retardada. Estos   cambios eran m&aacute;s notorios, pero no exclusivos, en los   adolescentes con politerapia. Hallazgos similares fueron los   del grupo de Mikkonen y colaboradores,<sup>36</sup> quienes   informaron disminuci&oacute;n del volumen testicular en el 40&#37;,   7&#37;, 17&#37; y 36&#37; de los adolescentes tratados,   respectivamente, con carbamacepina, lamotrigina,   oxcarbacepina y &aacute;cido valproico.   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">Estas variaciones en los resultados de los ex&aacute;menes de   laboratorio y en las medidas antropom&eacute;tricas podr&iacute;an   relacionarse con el desempe&ntilde;o sexual de los   adolescentes y adultos j&oacute;venes con epilepsia. Cuando en   el tratamiento de las epilepsias se elije un f&aacute;rmaco   inductor hep&aacute;tico, se corre el riesgo de incrementar la   s&iacute;ntesis y liberaci&oacute;n de la SHBG. Al aumentar esta   globulina queda disponible menor concentraci&oacute;n de   testosterona libre para ejercer su funci&oacute;n en la   maduraci&oacute;n y el desempe&ntilde;o sexuales.<sup>37-41</sup>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">Los efectos de la epilepsia y de los medicamentos   antiepil&eacute;pticos sobre el eje hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nadas   tienen consecuencias adversas importantes en la   capacidad masculina de fertilizaci&oacute;n. Isojarvi y   colaboradores<sup>42</sup> demostraron que el semen de los   hombres con epilepsia tiene porcentajes importantes de   alteraciones morfol&oacute;gicas y de la motilidad de los   espermatozoides, as&iacute; como una reducida concentraci&oacute;n   por mililitro. Los espermatozoides de los pacientes en   tratamiento con &aacute;cido valproico, al igual que el de los   tratados con carbamacepina y oxcarbacepina, ten&iacute;an   graves alteraciones morfol&oacute;gicas. Las alteraciones de la   motilidad esperm&aacute;tica se presentaron m&aacute;s en los   pacientes expuestos a &aacute;cido valproico y carbamacepina   y en proporci&oacute;n no significativa con la oxcarbacepina. El   recuento de espermatozoides fue significativamente   menor en el grupo tratado con carbamacepina.   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">Existen al menos dos estudios integrales<sup>43,44</sup> del   desempe&ntilde;o sexual en hombres que consideran, adem&aacute;s   de las variables hormonales, las escalas de depresi&oacute;n y   ansiedad. Estas observaciones logran demostrar que el   componente emocional y la comorbilidad psicopatol&oacute;gica   pueden afectar dicho desempe&ntilde;o, de manera   independiente de los niveles hormonales. Otros   estudios<sup>45-50</sup> se centran en las variables hormonales sin   hacer menci&oacute;n de los estados emocionales.   </font></p>     <p>&nbsp;</p>     <p><font  size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUSIONES</b>   </font></p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">De la revisi&oacute;n de la literatura sobre los efectos de la   epilepsia y de los f&aacute;rmacos antiepil&eacute;pticos &#40;FAE&#41; en el   desarrollo sexual de los adolescentes se puede concluir   lo siguiente:</font></p> <ul>       ]]></body>
<body><![CDATA[<li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> La epilepsia misma, los f&aacute;rmacos antiepil&eacute;pticos y los     factores psicosociales pueden influir de manera     variable en el desarrollo y desempe&ntilde;o sexuales de     los adolescentes.   </font></li>       <li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Seg&uacute;n la informaci&oacute;n disponible, las personas en     edades puberal y pospuberal son m&aacute;s susceptibles a     los efectos de los FAE en el desarrollo sexual.   </font></li>       <li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> El &aacute;cido valproico se relaciona con mayor frecuencia     con hiperandrogenismo y s&iacute;ndrome de ovarios     poliqu&iacute;sticos. </font></li>       <li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> La carbamacepina, por ser inductora enzim&aacute;tica en     el h&iacute;gado, incrementa el nivel de SHBG, disminuye la     testosterona libre e incrementa el metabolismo de     otras hormonas, con lo que interfiere en el desarrollo     y desempe&ntilde;o sexuales. Los f&aacute;rmacos antiepil&eacute;pticos     no solo pueden alterar el desarrollo sexual de los     adolescentes, sino que interfieren de manera variable     en su talla y peso y en las medidas testiculares y     penianas.   </font></li>       <li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Al parecer f&aacute;rmacos antiepil&eacute;pticos como     oxcarbacepina y lamotrigina tienen menor influencia     en el desarrollo y el desempe&ntilde;o sexuales.</font></li>       <li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">  Es posible que tanto la epilepsia como los f&aacute;rmacos     para tratarla tengan alguna relevancia en la capacidad     de fertilizar de las personas con epilepsia.</font></li>       <li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">  Son escasos los estudios que analicen los efectos de     los f&aacute;rmacos antiepil&eacute;pticos en adolescentes, y m&aacute;s     escasos a&uacute;n con los nuevos f&aacute;rmacos antiepil&eacute;pticos     que podr&iacute;an ser fuente de nuevos proyectos de     investigaci&oacute;n.</font></li>       <li><font  size="2" face="Verdana, Arial, Helvetica, sans-serif">  Limitar el estudio de la disfunci&oacute;n sexual en hombres     con epilepsia a la medici&oacute;n de hormonas es un enfoque     muy simplista. Los estudios futuros deben incluir     medidas de la calidad de vida y de ansiedad y     depresi&oacute;n.   </font></li>     </ul>     <p>&nbsp;</p>     ]]></body>
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Arch Sex Behav 1998; 27:   197-207. </font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000123&pid=S0121-0793201100010000400050&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>&nbsp;</p>     <p>&nbsp;</p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"> Recibido: agosto 10 de 2010    <br> Aceptado: septiembre 21 de 2010</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font  size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="1" id="1"></a><a href="#1a">&#42;</a> Estimulaci&oacute;n el&eacute;ctrica en la que un &aacute;rea cerebral recluta su contraparte sim&eacute;trica, y esta &uacute;ltima inicia despu&eacute;s de un tiempo la actividad el&eacute;ctrica independiente de la zona original.</font></p>      ]]></body><back>
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