<?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>1887-8571</journal-id>
<journal-title><![CDATA[Sanidad Militar]]></journal-title>
<abbrev-journal-title><![CDATA[Sanid. Mil.]]></abbrev-journal-title>
<issn>1887-8571</issn>
<publisher>
<publisher-name><![CDATA[Ministerio de Defensa]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1887-85712011000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Topiramato: efectos secundarios a nivel ocular. Revisión a propósito de un caso]]></article-title>
<article-title xml:lang="en"><![CDATA[Ocular side effects with topiramate: A case discussion and review of the literature]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medin Catoira]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medin Medin]]></surname>
<given-names><![CDATA[J.H.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Berruezo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Militar O'Donnell Servicio Oftalmología ]]></institution>
<addr-line><![CDATA[Ceuta ]]></addr-line>
<country>España</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Santiago de Compostela Facultad Medicina ]]></institution>
<addr-line><![CDATA[Santiago de Compostela ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>67</volume>
<numero>2</numero>
<fpage>100</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1887-85712011000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1887-85712011000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1887-85712011000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos un caso de miopización bilateral aguda asociada a hipertensión ocular por cierre angular, secundario al inicio del tratamiento con topiramato vía oral. Revisión: Revisamos los principales efectos oculares secundarios al tratamiento con topiramato, tales como cierre angular agudo asociado a glaucoma o hipertensión ocular, miopización secundaria, o toxicidad retiniana. Los síntomas aparecen típicamente en las primeras semanas tras iniciar el tratamiento, o al duplicar la dosis. El cuadro se resuelve normalmente al suspender el fármaco. Conclusión: El topiramato es un fármaco utilizado principalmente como antiepiléptico si bien es ampliamente utilizado en otros tratamientos neurológicos y cuadros variados como cefaleas, alcoholismo, espasmos infantiles, neuralgias e incluso tratamiento de la obesidad y bulimia, entre otros. Dados los efectos secundarios descritos a nivel ocular, éstos deben ser conocidos por el oftalmólogo, y considerados por el médico prescriptor, informando al paciente y a su familia al inicio del tratamiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Clinical case: We describe a case of acute bilateral ocular myopia associate to ocular hypertension by angle-closure secondary oral treatment with topiramate. Review: We review the main ocular effects related to the treatment with topiramate, such as angle-closure glaucoma, hypertension, secondary myopia, or retinal toxicity. Symptoms typically occur in the first weeks of the topiramate therapy, or when the dose is duplicate. The disease and symtoms dissapear when the medication is discontinued. Conclusion: The topiramato is a drug used mainly as anti-epileptic, and also in other variable neurological disorders as migraines, alcoholism, spasms, neuralgias and obesity and bulimia, among others. The secondary ocular effects must be known by the ophtalmologist and communicated to the patient and his family at the beginning of the treatment.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Topiramato]]></kwd>
<kwd lng="es"><![CDATA[glaucoma secundario de ángulo cerrado]]></kwd>
<kwd lng="es"><![CDATA[miopía sencundaria]]></kwd>
<kwd lng="es"><![CDATA[toxicidad retiniana]]></kwd>
<kwd lng="en"><![CDATA[Topiramate]]></kwd>
<kwd lng="en"><![CDATA[angle closure glaucoma]]></kwd>
<kwd lng="en"><![CDATA[secondary myopia]]></kwd>
<kwd lng="en"><![CDATA[retinal toxicity]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><font face="Verdana" size="2"><a name="top"></a><b>COMUNICACI&Oacute;N BREVE</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><b>Topiramato: efectos secundarios a nivel ocular. Revisión a propósito de un caso</b></font></p>     <p><font face="Verdana" size="4"><b>Ocular side effects with topiramate: A case discussion and review of the literature</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Medin Catoira J.<sup>1</sup>, Medin Medin J.H.<sup>2</sup>, López Berruezo J.<sup>3</sup></b></font></p>     <p><font face="Verdana" size="2"><sup>1</sup>Tcol. M&eacute;dico. Hospital Militar O'Donnell. Servicio Oftalmolog&iacute;a. Ceuta. Espa&ntilde;a.    <br><sup>2</sup>Lic. Medicina. Facultad Medicina. Santiago de Compostela. Espa&ntilde;a.    <br><sup>3</sup>DUE. Hospital Militar O'Donnell. Servicio Oftalmolog&iacute;a. Ceuta. Espa&ntilde;a.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><a href="#bajo">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2">Presentamos un caso de miopizaci&oacute;n bilateral aguda asociada a hipertensi&oacute;n ocular por cierre angular, secundario al inicio del tratamiento con topiramato v&iacute;a oral.    <br><b>Revisi&oacute;n:</b> Revisamos los principales efectos oculares secundarios al tratamiento con topiramato, tales como cierre angular agudo asociado a glaucoma o hipertensi&oacute;n ocular, miopizaci&oacute;n secundaria, o toxicidad retiniana. Los s&iacute;ntomas aparecen t&iacute;picamente en las primeras semanas tras iniciar el tratamiento, o al duplicar la dosis. El cuadro se resuelve normalmente al suspender el f&aacute;rmaco.    <br><b>Conclusi&oacute;n:</b> El topiramato es un f&aacute;rmaco utilizado principalmente como antiepil&eacute;ptico si bien es ampliamente utilizado en otros tratamientos neurol&oacute;gicos y cuadros variados como cefaleas, alcoholismo, espasmos infantiles, neuralgias e incluso tratamiento de la obesidad y bulimia, entre otros. Dados los efectos secundarios descritos a nivel ocular, &eacute;stos deben ser conocidos por el oftalm&oacute;logo, y considerados por el m&eacute;dico prescriptor, informando al paciente y a su familia al inicio del tratamiento.</font></p>     <p><font face="Verdana" size="2"><b>Palabras clave:</b> Topiramato, glaucoma secundario de &aacute;ngulo cerrado, miop&iacute;a sencundaria, toxicidad retiniana.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><b>SUMMARY</b></font></p>     <p><font face="Verdana" size="2"><b>Clinical case:</b> We describe a case of acute bilateral ocular myopia associate to ocular hypertension by angle-closure secondary oral treatment with topiramate.    ]]></body>
<body><![CDATA[<br><b>Review: </b> We review the main ocular effects related to the treatment with topiramate, such as angle-closure glaucoma, hypertension, secondary myopia, or retinal toxicity. Symptoms typically occur in the first weeks of the topiramate therapy, or when the dose is duplicate. The disease and symtoms dissapear when the medication is discontinued.    <br><b>Conclusion:</b> The topiramato is a drug used mainly as anti-epileptic, and also in other variable neurological disorders as migraines, alcoholism, spasms, neuralgias and obesity and bulimia, among others. The secondary ocular effects must be known by the ophtalmologist and communicated to the patient and his family at the beginning of the treatment.</font></p>     <p><font face="Verdana" size="2"><b>Palabras clave:</b> Topiramate, angle closure glaucoma, secondary miop&iacute;a, retinal toxicity.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Introducción</b></font></p>     <p><font face="Verdana" size="2">El Topiramato &#091;sulfamato de 2,3:4,5-Bis-O-(1-metiletilideno)-beta-D-fructopiranosa&#093; es un monosac&aacute;rido sulfamato sustituido sintetizado en 1980 y aprobado en 1995 como medicamento anticonvulsivo utilizado para tratamiento de epilepsia tanto en ni&ntilde;os como adultos. Entre otras indicaciones se encuentran principalmente el tratamiento del S&iacute;ndrome de Lenox-Gastaut, prevenci&oacute;n de la migra&ntilde;a, trastorno bipolar<sup>1</sup>, tratamiento de la obesidad (al reducir la ingesta incontrolada) y bulimia nerviosa<sup>2</sup>, alcoholismo<sup>3</sup>, trastornos por estr&eacute;s postraum&aacute;tico<sup>4</sup>, espasmo infantil<sup>5</sup>, cefalea en racimos<sup>6</sup>, tabaquismo<sup>7</sup>, tratamiento del dolor neurop&aacute;tico, especialmente neuralgia del trig&eacute;mino<sup>8</sup> y s&iacute;ndrome piernas inquietas<sup>9</sup>.</font></p>     <p><font face="Verdana" size="2">Tras su administraci&oacute;n oral es r&aacute;pidamente absorbido, y la mayor parte del f&aacute;rmaco (70%) se excreta en la orina sin modificaciones. El resto es metabolizado en h&iacute;gado por hidroxilaci&oacute;n, hidr&oacute;lisis y glucoronidaci&oacute;n. El topiramato estimula los canales de cloro activados por GABA, inhibe los neurotransmisones excitadores a trav&eacute;s de acciones sobre el kainato y los receptores AMPA, tiene un efecto espec&iacute;fico sobre los receptores GluR5 del kainato, y act&uacute;a como inhibidor de la anhidrasa carb&oacute;nica.</font></p>     <p><font face="Verdana" size="2">Los efectos secundarios m&aacute;s frecuentes, presentes en al menos un 10% de los sujetos, por orden de prevalencia incluyen: dolor de cabeza (23,8%), parestesias, aturdimiento y hormigueo (23,1%), infecciones del tracto respiratorio superior (17,5%), diarrea (16,8%), na&uacute;seas (15,4%), somnonoliencia (15,4%), anorexia, p&eacute;rdida de apetito (13,3%), insomnio (11,9%), problemas de memoria (11,2%), y v&eacute;rtigo (10,5%).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Caso cl&iacute;nico</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Mujer, de 18 a&ntilde;os de edad, remitida de urgencias por el servicio de Medicina Interna por referir visi&oacute;n borrosa en ambos ojos de 5 d&iacute;as de evoluci&oacute;n. Como &uacute;nicos antecedentes refiere hipotiroidismo a tratamiento con levotiroxina 100 microgramos/d&iacute;a, y cefaleas para las que se ha prescrito recientemente tratamiento con nadolol 40 mgrs/noches, y topiramato 25 mgrs en las ma&ntilde;anas. Aporta un estudio anal&iacute;tico reciente, previo al tratamiento, dentro de la normalidad.</font></p>     <p><font face="Verdana" size="2">Su historial cl&iacute;nico oftalmol&oacute;gico recog&iacute;a una agudeza visual previa, 6 meses antes, de unidad (10/10) ambos ojos con una correcci&oacute;n de +0,50 esfera -0,75 cilindro a 100<sup>o</sup> en ojo derecho y +0,75 esfera -0,75 cilindro a 75<sup>o</sup> en ojo izquierdo.</font></p>     <p><font face="Verdana" size="2">Se realiz&oacute; nuevo estudio refractivo que determina un cambio mi&oacute;pico en ambos ojos con -4,25 esfera -0,50 cilindro a 110<sup>o</sup> en ojo derecho y -3,75 esfera -1,00 cilindro a 60<sup>o</sup> en ojo izquierdo, correcci&oacute;n con la que alcanzaba agudeza visual igual a 0,6 (6/10) en ojo derecho y 0,7 (7/10) en ojo izquierdo.</font></p>     <p align=center><font face="Verdana" size="2"><img src="/img/revistas/sm/v67n2/comunicacion_breve2_figura1.jpg" alt="Figura 1. Estructura del Topiramato." width="454" height="356">    <br><b>Figura 1.</b> <i>Estructura del Topiramato.</i></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2">El estudio biomicrosc&oacute;pico mostraba leve hiperemia y congesti&oacute;n conjuntival en ambos ojos, c&aacute;maras anteriores estrechas con signo de eclipse positivo (<a href="#f2">Fig. 2</a>) y c&oacute;rneas y cristalinos transparentes, sin signos inflamatorios ni seclusi&oacute;n. Pupilas isoc&oacute;ricas y normorreactivas. Motilidad ocular normal. La presi&oacute;n intraocular medida con ton&oacute;metro de aplanaci&oacute;n era de 32 mmHg en el ojo derecho y 29 mmHg en el ojo izquierdo. Exploraci&oacute;n de papilas y polo posterior dentro de la normalidad.</font></p>     <p>&nbsp;</p>     <p align="center"><font face="Verdana" size="2"><a name="f2"><img src="/img/revistas/sm/v67n2/comunicacion_breve2_figura2.jpg" width="600" height="329"></a>    <br><b>Figura 2.</b> <i>Estrechamiento c&aacute;mara anterior OD/OI (Med&iacute;n H.).</i></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana" size="2">Bajo la sospecha de cierre angular agudo se inici&oacute; tratamiento oral con inhibidores de la anhidrasa carb&oacute;nica (acetazolamida 250 mgrs), &frac12; cp cada 8 horas, y t&oacute;pico con bimatoprost y maleato de timolol en colirio, con suspensi&oacute;n de las medicaciones de reciente introducci&oacute;n (nadolol y topiramato).</font></p>     <p><font face="Verdana" size="2">A las 24 horas mostraba tensiones de 23 mmHg en ambos ojos, y 13 mmHg en ojo derecho y 12 mmHg en ojo izquierdo a las 48 horas, con normalizaci&oacute;n de profundidad de la c&aacute;mara anterior (<a href="#f3">Fig. 3</a>), por lo que se redujo el tratamiento con acetazolamida progresivamente a las 48 horas, tercer y cuarto d&iacute;a hasta supresi&oacute;n total y el tratamiento t&oacute;pico se retir&oacute; a los 7 d&iacute;as, manteniendo en controles posteriores tensiones normales de 17-18 mmHg en ambos ojos a las 3, 6 y 12 semanas, sin tratamiento.</font></p>     <p align=center><font face="Verdana" size="2"><a name="f3"><img src="/img/revistas/sm/v67n2/comunicacion_breve2_figura3.jpg" alt="Figura 3. C&aacute;mara anterior normal imagen Pentacam (Med&iacute;n H.)." width="454" height="467"></a>    <br><b>Figura 3.</b> <i>Cámara anterior normal imagen Pentacam (Med&iacute;n H.).</i></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2">La visi&oacute;n se normaliz&oacute; totalmente a las 72 horas, con agudeza visual igual a la unidad en ambos ojos y refracci&oacute;n similar a la previa al episodio.</font></p>     <p><font face="Verdana" size="2">Se realiz&oacute; diagn&oacute;stico final de miopizaci&oacute;n e hipertensi&oacute;n ocular por cierre angular agudo secundarios al tratamiento con topiramato, lo cual fue comunicado a la paciente, familia y servicio de Medicina Interna como prescriptor del f&aacute;rmaco.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Discusi&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Los efectos secundarios oculares que han sido relacionados con el tratamiento con topiramato, han sido considerados entre las reacciones adversas "raras" incluyen principalmente (<a href="#f4">fig. 4</a>):</font></p>     <blockquote>     <p><font face="Verdana" size="2">&bull; Cierre Angular.    <br>&bull; Glaucoma Secundario A Cierre Angular.    <br>&bull; Miop&iacute;a secundaria.    <br>&bull; Alteraciones del Campo Visual.    <br>&bull; Maculopat&iacute;a.</font></p> </blockquote>     <p>&nbsp;</p>     <p align=center><font face="Verdana" size="2"><a name="f4"><img src="/img/revistas/sm/v67n2/comunicacion_breve2_figura4.jpg" alt="Figura 4. Principales efectos secundarios del topiramato a nivel ocular (Med&iacute;n H.)" width="454" height="819"></a>    <br><b>Figura 4.</b> <i>Principales efectos secundarios del topiramato a nivel ocular (Med&iacute;n H.)</i></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana" size="2">Si bien las reacciones adversas de visi&oacute;n doble y visi&oacute;n an&oacute;mala, se consideran como muy frecuentes &ge;1/10&#093; en la ficha t&eacute;cnica del producto, las restantes alteraciones oculares son referenciadas como de "rara" presentaci&oacute;n &ge;1/10.000 &lt; 1/1.000&#093;.</font></p>     <p><font face="Verdana" size="2"><b>A. Cierre angular</b></font></p>     <p><font face="Verdana" size="2">Banta y col publicaron en 2001 el primer caso de glaucoma por cierre angular agudo inducido por topiramato en un hombre de 51 a&ntilde;os, durante las etapas iniciales de tratamiento<sup>10</sup>. Casos similares fueron posteriormente publicados, entre otros, por Cabrera<sup>11</sup> y Kakarla<sup>12</sup>. La mayor&iacute;a de los cuadros ha tenido lugar dentro de las 2 primeras semanas del inicio del tratamiento o a las pocas horas de duplicar la dosis<sup>10,13</sup>. Las edades de los casos descritos oscilan entre los 3 y 70 a&ntilde;os, preferentemente en mujeres (80% de los casos), y errores refractivos previos entre +4 a -5,25 D. El efecto no parece ser dosis dependiente, pues se han encontrado cambios en tratamiento con dosis bajas de 25 mgrs/d&iacute;a<sup>14</sup>, como en el caso que nos ocupa.</font></p>     <p><font face="Verdana" size="2">El cierre angular inducido por topiramato se ha descrito como una reacci&oacute;n idiosincr&aacute;sica que puede ocurrir incluso en pacientes con c&aacute;mara anterior de profundidad normal. El f&aacute;rmaco da lugar a un aumento de los niveles de prostaglandinas que act&uacute;an desencadenando un edema de cuerpo ciliar a nivel local pero sin actuar a nivel sist&eacute;mico<sup>15</sup> aunque se ha comprobado que atraviesa la barrera hematoencef&aacute;lica y se ha detectado en v&iacute;treo<sup>16</sup>. La biomicroscopia ultras&oacute;nica muestra la presencia de un s&iacute;ndrome de efusi&oacute;n ciliocoroidea, edema y rotaci&oacute;n anterolateral del cuerpo ciliar, con relajaci&oacute;n zonular, cambios que conducen a un desplazamiento anterior del diafragma iris-cristalino y, como consecuencia se produce un estrechamiento de la c&aacute;mara anterior responsable de la miopizaci&oacute;n y de la crisis de glaucoma agudo<sup>17-19</sup>. Si bien se ha descrito un incremento del grosor del cristalino, este incremento del grosor de la lente contribuye s&oacute;lo m&iacute;nimamente (9-16%) al estrechamiento de la c&aacute;mara anterior<sup>20</sup>. El efecto no parece ser dosis dependiente pues, como se ha referido, puede darse con dosis de 25 mgrs/d&iacute;a<sup>14,21</sup>.</font></p>     <p><font face="Verdana" size="2">Otros sulfaderivados que pueden precipitar cierre angular agudo por el mecanismo descrito son acetazolamida, clotrimoxazol, hidroclorotiazida, clortalidona, triamtirene y sulfametoxazol, lo que refuerza la idea de que puede tratarse de una hipersensibilidad al componente sulfam&iacute;dico<sup>22</sup>.</font></p>     <p><font face="Verdana" size="2"><b>A. Miopia secundaria</b></font></p>     <p><font face="Verdana" size="2">Se han publicado igualmente diferentes casos de miop&iacute;a secundaria, tanto en adultos como en ni&ntilde;os, en un rango de -2 a -9 dioptr&iacute;as, tambi&eacute;n con m&aacute;s frecuencia en mujeres<sup>23</sup>, y dentro de los primeros d&iacute;as de tratamiento<sup>11,24</sup>. La presi&oacute;n intraocular puede ser normal, o acompa&ntilde;arse de hipertensi&oacute;n por cierre angular, y el cuadro es reversible dentro de los 3 a 4 d&iacute;as tras retirar el tratamiento<sup>25</sup>.</font></p>     <p><font face="Verdana" size="2">El mecanismo de la miop&iacute;a aguda es similar al reportado para las sulfonamidas, fue descrito por vez primera por Berns en 1938<sup>26</sup> y ha sido comunicado en diferentes casos de tratamiento con topiramato, sulfonamidas y acetazolamida<sup>27-31</sup>. El edema y rotaci&oacute;n anterolateral del cuerpo ciliar conducen a la relajaci&oacute;n zonular, desplazamiento anterior de iris y cristalino e incremento de la distancia entre lente y retina responsables de la miopizaci&oacute;n. Si bien se ha descrito tambien la presencia de edema cristaliniano por cambios osm&oacute;ticos o metab&oacute;licos producidos por las sulfonamidas<sup>32-34</sup>, este edema no est&aacute; presente en todos los casos de miopizaci&oacute;n por sulfonamidas o an&aacute;logos. (<a target="_blank" href="/img/revistas/sm/v67n2/comunicacion_breve2_tabla1.jpg">Tabla 1</a>)</font></p>     <p><font face="Verdana" size="2"><b>C. Alteraciones del campo visual</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Se han descrito casos de hemianopsia hom&oacute;nima tras administraci&oacute;n de 125 mg topiramato durante 12 semanas, con mejor&iacute;a progresiva y recuperaci&oacute;n parcial del campo visual al suspender el tratamiento<sup>35,36</sup>. Igualmente se han notificado otros defectos del Campo Visual tales como contracci&oacute;n perif&eacute;rica o defectos arcuatos superiores<sup>37</sup>.</font></p>     <p><font face="Verdana" size="2">El mecanismo exacto de las alteraciones del campo visual es desconocido. Un estudio en animales evaluando los efectos de la administraci&oacute;n cr&oacute;nica de topiramato ha revelado una reducci&oacute;n significativa de la funci&oacute;n retiniana con reducci&oacute;n de la amplitud de las ondas b en el ERG asociada a cambios inmunohistqu&iacute;micos caracterizados por una severa acumulaci&oacute;n de GABA en las c&eacute;lulas amacrinas de la retina interna, plexiforme interna, nuclear interna y entre las c&eacute;lulas ganglionares. Estos cambios sugieren que el topiramato puede da&ntilde;ar la retina por acumulaci&oacute;n de GABA, al igual que ocurre con la vigabatrina<sup>38</sup>.</font></p>     <p><font face="Verdana" size="2">En 2008, Tsui y colaboradores publican un caso con ERGs anormales electronegativos en ambos ojos, y disminuci&oacute;n de las respuestas de los bastones tras tratamiento con topiramato. La presencia de onda b anormal con onda a normal se ha relacionado cl&aacute;sicamente con la disfunci&oacute;n de los segmentos internos de los fotorreceptores, lo cual parece confirmar los hallazgos de Kjellstrom<sup>39</sup>. ERGs negativos tambi&eacute;n han sido asociados en otras toxicidades retinianas adquiridas tales como exposici&oacute;n a metanol, hierro, vincristina y quinina<sup>40</sup>.</font></p>     <p><font face="Verdana" size="2"><b>D. Otras alteraciones</b></font></p>     <p><font face="Verdana" size="2">Se han descrito otras alteraciones retinianas tales como maculopat&iacute;a bilateral de car&aacute;cter irreversible<sup>41-43</sup>, estr&iacute;as retinianas y desprendimiento de retina<sup>44</sup>. Si bien el mecanismo de la maculopat&iacute;a es desconocido, se supone sea posiblemente an&aacute;logo al de la vigabatrina, de probada toxicidad retiniana, al incrementar la presencia y persistencia de altos niveles de GABA en la retina, cuerpo geniculado lateral y c&oacute;rtex visual. Las estr&iacute;as retinianas pueden ser causadas por tracci&oacute;n vitreorretiniana media y reversibles tras el cese del tratamiento<sup>45</sup>, y el desprendimiendo de retina podr&aacute; ser debido a la presencia de fluido subretiniano por un mecanismo similar a la efusi&oacute;n ciliocoroidea idiop&aacute;tica, que podr&iacute;a precipitar la producci&oacute;n de desgarros sobre zonas degenerativas predisponentes (lattice).</font></p>     <p><font face="Verdana" size="2">Otras alteraciones que se han asociado al uso del topiramato se encuentran las efusiones supracoroideas y escleritis<sup>13</sup>, edema periorbitario, blefaroespasmo, crisis oculogiras, dolor ocular, diplop&iacute;a y nistagmus<sup>46</sup>. Estos &uacute;ltimos generalmente en relaci&oacute;n con el uso de altas dosis de medicamento.</font></p>     <p><font face="Verdana" size="2"><b>Manejo</b></font></p>     <p><font face="Verdana" size="2">Dado que en la mayor&iacute;a de los casos los efectos secundarios oculares se presentan dentro de las pocas semanas de iniciar la dosis, y el 85% de los casos dentro de las 2 primeras semanas con una media de 7 d&iacute;as, es importante instruir a los pacientes para que informen a su especialista y al m&eacute;dico prescriptor, de cualquier cambio visual o sensaci&oacute;n de visi&oacute;n borrosa.</font></p>     <p><font face="Verdana" size="2">Si bien la miopizaci&oacute;n ser&aacute; reversible al reducir o suspender el tratamiento, la presencia de cierre angular agudo e hipertensi&oacute;n ocular puede precisar de la asociaci&oacute;n de hipotensores t&oacute;picos y orales, ciclopl&eacute;jicos y esteroides. La sospecha de existencia de toxicidad retiniana obligar&aacute; igualmente a la retirada del tratamiento.</font></p>     <p><font face="Verdana" size="2">No obstante, la reducci&oacute;n y/o suspensi&oacute;n de la medicaci&oacute;n debe realizarse siempre bajo supervisi&oacute;n del m&eacute;dico que prescribi&oacute; el tratamiento con topiramato, ya que pautas descendentes superiores a 50 mgs podr&iacute;an exacerbar la patolog&iacute;a de base del paciente.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Si bien est&aacute;n indicados los supresores acuosos t&oacute;picos y orales, debe tomarse precauci&oacute;n con el uso de la acetazolamida por el riesgo de inducci&oacute;n de c&aacute;lculos renales y edema ciliar por lo que se ha propuesto el uso de metilprednisolona y manitol para la r&aacute;pida resoluci&oacute;n del ataque de cierre angular provocado por la efusi&oacute;n cilio-coroidea, al igual que lo descrito en otros glaucomas producidos por efusi&oacute;n uveal<sup>47</sup>.</font></p>     <p><font face="Verdana" size="2">Se pueden utilizar agentes ciclopl&eacute;jicos que pueden reducir la presi&oacute;n intraocular mediante la retracci&oacute;n de los procesos ciliares. Se desaconseja totalmente el uso de la pilocarpina, que puede incrementar el cierre angular y empeorar los s&iacute;ntomas y signos. La iridotom&iacute;a, habitualmente &uacute;til en el glaucoma por cierre angular puede no ser &uacute;til si no existe bloqueo pupilar.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Conclusiones</b></font></p>     <p><font face="Verdana" size="2">Es necesario Informar a los pacientes de los posibles efectos secundarios, antes del inicio del tratamiento con topiramato.</font></p>     <p><font face="Verdana" size="2">El paciente debe prestar atenci&oacute;n a la presencia de potenciales alteraciones visuales al inicio del tratamiento o al incrementar la dosis.</font></p>     <p><font face="Verdana" size="2">En el estudio de las alteraciones visuales de corta evoluci&oacute;n, cierre angular agudo, miopizaci&oacute;n, maculopat&iacute;a y alteraciones campim&eacute;tricas de reciente aparici&oacute;n, el especialista debe recabar informaci&oacute;n sobre los tratamientos realizados por los pacientes, as&iacute; como sus posibles reacciones adversas.</font></p>     <p><font face="Verdana" size="2">En caso de cierre angular agudo, se debe considerar igualmente la presencia de tratamientos asociados con otros sulfaderivados ya citados<sup>22</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>     ]]></body>
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<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">46. Watss P. A review of the ocular side effects of topiramate. 2006. Paediatric Ophthalmology Suncommittee. Royal College of Ophthalmologists. <a target="_blank" href="http://www.rcophth.%20ac.uk/core/core_picker/download.asp?id=364">www.rcophth. ac.uk/core/core_picker/download.asp?id=364</a>.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5847810&pid=S1887-8571201100020000700046&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">47. Rhee DJ, Ramos-Esteban JC, Nipper KS. Rapid resolution of topiramate induced angle-closure with methylprednisolone and mannitol. Am J Opthalmol 2006; 141(6):1133-4.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5847812&pid=S1887-8571201100020000700047&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><a href="#top"><img border="0" src="/img/revistas/sm/v67n2/seta.gif" width="15" height="17"></a><a name="bajo"></a><b>Dirección para correspondencia:</b>    <br>Dr. Juan Med&iacute;n Catoira.    <br>Hospital Militar O'Donnell.    <br>Avda. Dr. Mara&ntilde;&oacute;n s/n. Ceuta. Espa&ntilde;a.    ]]></body>
<body><![CDATA[<br>Tfno: 956526663.    <br>email: <a href="mailto:jumedcat@telefonica.net">jumedcat@telefonica.net</a></font></p>     <p><font face="Verdana" size="2">Recibido: 9 de agosto de 2010    <br>Aceptado: 2 de diciembre de 2010</font></p>      ]]></body><back>
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<person-group person-group-type="author">
<name>
<surname><![CDATA[Watss]]></surname>
<given-names><![CDATA[P]]></given-names>
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<year>2006</year>
<publisher-name><![CDATA[Paediatric Ophthalmology Suncommittee. Royal College of Ophthalmologists]]></publisher-name>
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<person-group person-group-type="author">
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<article-title xml:lang="en"><![CDATA[Rapid resolution of topiramate induced angle-closure with methylprednisolone and mannitol]]></article-title>
<source><![CDATA[Am J Opthalmol]]></source>
<year>2006</year>
<volume>141</volume>
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</article>
