<?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>S1665-11462011000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Uso de flunarizina en un caso con síndrome de Landau-Kleffner]]></article-title>
<article-title xml:lang="en"><![CDATA[Use of flunarizine in a case of Landau-Kleffner syndrome]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos Guevara]]></surname>
<given-names><![CDATA[Verónica]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales Villegas]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López García]]></surname>
<given-names><![CDATA[Minerva]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres López]]></surname>
<given-names><![CDATA[Karina Denise]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bravo Oro]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Central Dr. Ignacio Morones Prieto Departamento de Neuropediatría ]]></institution>
<addr-line><![CDATA[San Luis Potosí San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<volume>68</volume>
<numero>1</numero>
<fpage>48</fpage>
<lpage>53</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462011000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462011000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462011000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción. El síndrome de Landau-Kleffner se caracteriza por afasia adquirida y anormalidades electroencefalográficas durante la vigilia y el sueño. El tratamiento con anticonvulsivos controla las crisis convulsivas pero en los problemas de lenguaje y comportamiento su eficacia es menor. Algunos reportes señalan mejoría de lenguaje con el uso de corticoesteroides en etapas tempranas y a dosis altas. Otra opción terapéutica es el uso de calcioantagonistas. Caso clínico. Paciente de 5 años de edad con evolución normal hasta los 2 años hasta que los padres observaron la pérdida espontánea del lenguaje previamente adquirido. En la evaluación neurológica se encontraron abundantes ecolalias e indiferencia a estímulos externos. El electroencefalograma mostró brotes intermitentes de ondas agudas y complejos punta-onda lenta de 3-4 Hz generalizados durante el sueño. Se inició tratamiento con prednisona por un mes y ácido valproico. Se continuó con el ácido valproico y después de 4 meses se añadió flunarizina, con lo que se observó mejoría en el lenguaje. Conclusiones. Este caso presenta los hallazgos clínicos y electroencefalográficos del síndrome; se observó que la mejor respuesta al tratamiento se obtuvo al agregar flunarizina. Esta evidencia contribuye a apoyar su uso y fundamenta la realización posterior de estudios controlados para concluir certeramente sobre su utilidad en el padecimiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Background. Landau-Kleffner syndrome is characterized by acquired aphasia and electroencephalographic abnormalities during wake-fulness and sleep. These abnormalities can be solved with anticonvulsive medications, but speech and behavioral problems cannot be treated using this therapy. Instead, there are reports that indicate that treatment with high-dose corticosteroids during early stages of the disease improves the speech difficulties. Use of calcium antagonists has also been proposed as possible treatment. Case report. We report the case of a 5-year-old patient with normal development until the age of 2 years. At that time, the parents observed loss of spontaneous acquired speech. During neurological evaluation, the child showed abundant echolalia and indifference to external stimuli. Electroencephalogram showed sharp waves and generalized slow spike-wave complexes of 3-4 Hz during sleep. We began treatment with prednisone and valproic acid for 1 month; flunarizine was added. After 4 months of treatment, the patient showed speech improvement. Conclusions. Our case has the characteristic clinical and electroencephalographic findings of Landau-Kleffner syndrome. We observed significant symptom improvement when flunarizine was added to the treatment. This evidence offers support for the use of a calcium antagonist as possible therapy, which may help setting the way for future controlled studies in order to finally establish its utility with this illness.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[síndrome de Landau-Kleffner]]></kwd>
<kwd lng="es"><![CDATA[afasia adquirida]]></kwd>
<kwd lng="es"><![CDATA[calcioantagonistas]]></kwd>
<kwd lng="es"><![CDATA[flunarizina]]></kwd>
<kwd lng="es"><![CDATA[electroencefalograma]]></kwd>
<kwd lng="es"><![CDATA[complejos punta-onda lenta]]></kwd>
<kwd lng="en"><![CDATA[Landau-Kleffner syndrome]]></kwd>
<kwd lng="en"><![CDATA[acquired aphasia]]></kwd>
<kwd lng="en"><![CDATA[calcium-antagonist]]></kwd>
<kwd lng="en"><![CDATA[flunarizine]]></kwd>
<kwd lng="en"><![CDATA[electroencephalogram]]></kwd>
<kwd lng="en"><![CDATA[spike wave complexes]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Caso cl&iacute;nico</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Uso de flunarizina en un caso con s&iacute;ndrome de Landau&#45;Kleffner</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 flunarizine in a case of Landau&#45;Kleffner syndrome</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Ver&oacute;nica Campos Guevara, Ra&uacute;l Morales Villegas, Minerva L&oacute;pez Garc&iacute;a, Karina Denise Torres L&oacute;pez, Antonio Bravo Oro</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Departamento de Neuropediatr&iacute;a Hospital Central Dr. Ignacio Morones Prieto San Luis Potos&iacute;, San Luis Potos&iacute;, 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>Autor de correspondencia:</b>    <br>      <i>Dr. Antonio Bravo Oro</i>    <br>     Correo electr&oacute;nico: <a href="mailto:antoniobravooro@hotmail.com">antoniobravooro@hotmail.com</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Fecha de recepci&oacute;n: 14&#45;05&#45;09    <br> 	Fecha de aceptaci&oacute;n: 12&#45;02&#45;10</font></p>  	    <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"><b>Introducci&oacute;n.</b> El s&iacute;ndrome de Landau&#45;Kleffner se caracteriza por afasia adquirida y anormalidades electroencefalogr&aacute;ficas durante la vigilia y el sue&ntilde;o. El tratamiento con anticonvulsivos controla las crisis convulsivas pero en los problemas de lenguaje y comportamiento su eficacia es menor. Algunos reportes se&ntilde;alan mejor&iacute;a de lenguaje con el uso de corticoesteroides en etapas tempranas y a dosis altas. Otra opci&oacute;n terap&eacute;utica es el uso de calcioantagonistas.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Caso cl&iacute;nico.</b> Paciente de 5 a&ntilde;os de edad con evoluci&oacute;n normal hasta los 2 a&ntilde;os hasta que los padres observaron la p&eacute;rdida espont&aacute;nea del lenguaje previamente adquirido. En la evaluaci&oacute;n neurol&oacute;gica se encontraron abundantes ecolalias e indiferencia a est&iacute;mulos externos. El electroencefalograma mostr&oacute; brotes intermitentes de ondas agudas y complejos punta&#45;onda lenta de 3&#45;4 Hz generalizados durante el sue&ntilde;o. Se inici&oacute; tratamiento con prednisona por un mes y &aacute;cido valproico. Se continu&oacute; con el &aacute;cido valproico y despu&eacute;s de 4 meses se a&ntilde;adi&oacute; flunarizina, con lo que se observ&oacute; mejor&iacute;a en el lenguaje.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Conclusiones.</b> Este caso presenta los hallazgos cl&iacute;nicos y electroencefalogr&aacute;ficos del s&iacute;ndrome; se observ&oacute; que la mejor respuesta al tratamiento se obtuvo al agregar flunarizina. Esta evidencia contribuye a apoyar su uso y fundamenta la realizaci&oacute;n posterior de estudios controlados para concluir certeramente sobre su utilidad en el padecimiento.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> s&iacute;ndrome de Landau&#45;Kleffner, afasia adquirida, calcioantagonistas, flunarizina, electroencefalograma, complejos punta&#45;onda lenta.</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"><b>Background.</b> Landau&#45;Kleffner syndrome is characterized by acquired aphasia and electroencephalographic abnormalities during wake&#45;fulness and sleep. These abnormalities can be solved with anticonvulsive medications, but speech and behavioral problems cannot be treated using this therapy. Instead, there are reports that indicate that treatment with high&#45;dose corticosteroids during early stages of the disease improves the speech difficulties. Use of calcium antagonists has also been proposed as possible treatment.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Case report.</b> We report the case of a 5&#45;year&#45;old patient with normal development until the age of 2 years. At that time, the parents observed loss of spontaneous acquired speech. During neurological evaluation, the child showed abundant echolalia and indifference to external stimuli. Electroencephalogram showed sharp waves and generalized slow spike&#45;wave complexes of 3&#45;4 Hz during sleep. We began treatment with prednisone and valproic acid for 1 month; flunarizine was added. After 4 months of treatment, the patient showed speech improvement.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Conclusions.</b> Our case has the characteristic clinical and electroencephalographic findings of Landau&#45;Kleffner syndrome. We observed significant symptom improvement when flunarizine was added to the treatment. This evidence offers support for the use of a calcium antagonist as possible therapy, which may help setting the way for future controlled studies in order to finally establish its utility with this illness.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Landau&#45;Kleffner syndrome, acquired aphasia, calcium&#45;antagonist, flunarizine, electroencephalogram, spike wave complexes.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El s&iacute;ndrome de Landau&#45;Kleffner (SLK), tambi&eacute;n conocido como afasia epil&eacute;ptica adquirida, fue descrito por primera vez en 1957 por Landau y Kleffner en 6 ni&ntilde;os con antecedente de adquisici&oacute;n normal del lenguaje que posteriormente desarrollaron afasia adquirida con desorden convulsivo.<sup>1</sup> El padecimiento se observa con mayor frecuencia en varones que en mujeres, entre los 3 y 5 a&ntilde;os de edad, con desarrollo psicomotor y desarrollo del lenguaje, normales.<sup>2,3</sup> El trastorno de lenguaje es la primera manifestaci&oacute;n cl&iacute;nica y, en la mayor&iacute;a de los casos, el lenguaje receptivo es el primero en mostrar anormalidad.<sup>4</sup> En esta fase del padecimiento es cuando se sospecha que los pacientes presentan sordera por lo que frecuentemente se les realizan estudios para valorar la audici&oacute;n, mismos que resultan normales en la mayor&iacute;a de los casos. Posteriormente, se presentan alteraciones tambi&eacute;n en el lenguaje expresivo, como omisiones y parafasias que progresan hasta terminar en una falta de lenguaje. Es com&uacute;n que se acompa&ntilde;e de trastornos de conducta, como la hiperactividad (que es de los m&aacute;s frecuentes), indiferencia con el entorno y, en muchos casos, conductas autistas.<sup>5,6</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Las anormalidades electroencefalogr&aacute;ficas forman parte del s&iacute;ndrome, aunque s&oacute;lo en 70&#45;80% de los casos se presentan crisis convulsivas cl&iacute;nicas.<sup>7</sup>,<sup>8</sup> En el electroencefalograma (EEG) puede encontrarse una actividad normal, aunque es frecuente observar brotes de puntas, ondas agudas o complejos punta onda lenta en regiones temporales o parieto occipitales uni o bilateralmente. Algunos autores consideran que observar actividad continua de complejo punta&#45;onda lenta de 1.5&#45;5 Hz en al menos 85% del registro en sue&ntilde;o no&#45;REM puede ser caracter&iacute;stico del SLK.<sup>3,9&#45;</sup><sup>11</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En los &uacute;ltimos a&ntilde;os se han descrito los hallazgos de la magnetoencefalograf&iacute;a (MEG) en pacientes con SLK. La MEG sugiere que la actividad epil&eacute;ptica bilateral se genera en la corteza auditiva y en la corteza perisilviana asociada con el lenguaje en m&aacute;s de 80% de los pacientes.<sup>12,13</sup> Pateau R. reporta que 20% de los casos tienen actividad unilateral perisilviana que posteriormente se proyecta a regiones contralaterales.<sup>14</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El curso cl&iacute;nico del padecimiento es variable. Habitualmente, las crisis convulsivas se controlan y las anormalidades en el EEG tienden a desaparecer con el tiempo; pero la duraci&oacute;n de la afasia es impredecible y no depende de la presencia de crisis convulsivas o de la edad de inicio.<sup>15,16</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En la mayor&iacute;a de los casos no es posible establecer una causa. Sin embargo, existen teor&iacute;as causales sobre el padecimiento, entre ellas una de origen autoinmune. Nevsimalova S. y cols. demostraron la producci&oacute;n de anticuerpos contra la mielina perif&eacute;rica y central.<sup>17</sup> Otros casos se han relacionado con cuadros infecciosos, arteritis, tumores temporales, cisticercosis, enfermedades desmielinizantes, trastornos de la migraci&oacute;n neuronal y un caso asociado a deficiencia del complejo I respiratorio mitocondrial.<sup>18&#45;23</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El tratamiento con anticonvulsivos ha mostrado eficacia en el control de las crisis convulsivas, pero en los problemas de lenguaje y comportamiento su &eacute;xito es menor; incluso, f&aacute;rmacos como fenobarbital, carbamazepina y fenito&iacute;na pueden empeorar las crisis convulsivas, mientras que &aacute;cido valproico (VPA), levetiracetam, lamotrigina, etosuccimiday clobazam han mostrado resultados parciales o transitorios.<sup>24&#45;27</sup> El tratamiento con mejores resultados ha sido el uso de esteroides, incluyendo la prednisona, la metilprednisolona y la hormona adrenocorticotropa (ACTH). Su uso ha sido fundamentado por diversos autores que han demostrado su eficacia. Cuando se utiliza en etapas tempranas y con dosis altas, es posible observar mejor&iacute;a en el lenguaje, normalizaci&oacute;n en las alteraciones electroencefalogr&aacute;ficas y, adem&aacute;s, control de las crisis convulsivas.<sup>28&#45;34</sup> El uso de inmunoglobulina intravenosa en SLK tambi&eacute;n se incluye dentro de las opciones terap&eacute;uticas; sin embargo, la evidencia es insuficiente para considerar esta modalidad terap&eacute;utica superior al uso de corticoesteroides y/o anticonvulsivos.<sup>35,36</sup> Otras modalidades de tratamiento son la dieta cetog&eacute;nica y el estimulador vagal, pero no se cuenta con suficientes estudios para determinar su eficacia.<sup>37,38</sup> En general, no hay consenso sobre el tratamiento farmacol&oacute;gico ya que no se han realizado estudios controlados donde se establezcan la dosis y el tiempo de tratamiento de los f&aacute;rmacos o si han de utilizarse en monoterapia o combinados.</font></p>  	    <p align="justify"><font face="verdana" size="2">El tratamiento quir&uacute;rgico mediante m&uacute;ltiples transacciones subpiales en la corteza epileptog&eacute;nica se ha utilizado en pacientes donde la terapia con corticoesteroides y anticonvulsivos ha fracasado y la actividad epil&eacute;ptica es unilateral. Los trabajos reportan mejor&iacute;a considerable en las crisis convulsivas, en los trastornos de conducta y en el lenguaje.<sup>37,39&#45;41</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">A continuaci&oacute;n se describen los hallazgos cl&iacute;nicos y la respuesta al tratamiento medicamentoso en una paciente con s&iacute;ndrome de Landau&#45;Kleffner.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Caso cl&iacute;nico</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se trata de un paciente femenino de 5 a&ntilde;os producto de segunda gestaci&oacute;n con curso normal y periodo neonatal sin complicaciones. Padres j&oacute;venes no consangu&iacute;neos, sin antecedentes familiares de epilepsia. Su desarrollo tanto psicomotor como del lenguaje fueron normales hasta los 2 a&ntilde;os de edad, cuando sus padres observaron falta de respuesta a &oacute;rdenes sencillas e indiferencia a est&iacute;mulos externos. Posteriormente mostr&oacute; p&eacute;rdida del lenguaje espont&aacute;neo (s&oacute;lo emit&iacute;a ecolalias) por lo que a los 3 a&ntilde;os de edad inici&oacute; con terapia del lenguaje durante un a&ntilde;o, sin mejor&iacute;a. Se descart&oacute; p&eacute;rdida auditiva mediante la realizaci&oacute;n de potenciales evocados de tallo cerebral, por lo que fue remitida a evaluaci&oacute;n neurol&oacute;gica, en la que se descartaron movimientos anormales, conductas ritualistas, estereotipias o p&eacute;rdida del contacto visual en el interrogatorio. Se encontraron abundantes ecolalias, obediencia de &oacute;rdenes sencillas de forma ocasional y lenta, contacto visual adecuado pero indiferente al medio y no se apreciaron movimientos estereotipados. Neurol&oacute;gicamente no cumpli&oacute; con los criterios del DSM&#45;IV para el diagn&oacute;stico de autismo. Se le realizaron EEG en reposo, en vigilia y en sue&ntilde;o no&#45;REM; durante este &uacute;ltimo se observaron brotes intermitentes de ondas agudas y complejos punta&#45;onda lenta de 3&#45;4 Hz generalizadas durante el sue&ntilde;o (<a href="#f1">Figura 1A</a>). Durante la vigilia no se observ&oacute; actividad parox&iacute;stica (<a href="#f1">Figura 1B</a>). La tomograf&iacute;a axial computarizada simple y la contrastada, de cr&aacute;neo, fueron normales.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v68n1/a7f1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Se inici&oacute; tratamiento con &aacute;cido valproico (VPA) a 20 mg/kg/d&iacute;a, prednisona a 1 mg/kg/d&iacute;a y se continu&oacute; con la terapia de lenguaje. Un mes despu&eacute;s la paciente adquiri&oacute; nuevamente lenguaje espont&aacute;neo emitiendo de 5 a 10 palabras, aunque persist&iacute;an las ecolalias. Tambi&eacute;n mejor&oacute; la capacidad de respuesta a est&iacute;mulos externos y respondi&oacute; a preguntas sencillas. La prednisona se administr&oacute; durante un mes y se suspendi&oacute; gradualmente. Se continu&oacute; con VPA y terapia de lenguaje.</font></p>  	    <p align="justify"><font face="verdana" size="2">A los cuatro meses de iniciado el tratamiento a la paciente se le realiz&oacute; un EEG en sue&ntilde;o fisiol&oacute;gico y se observaron ondas agudas frontocentrales bilaterales aisladas con ritmos de sue&ntilde;o normales para la edad (<a href="#f2">Figura 2</a>). A pesar de que persist&iacute;an las ecolalias, el aumento de lenguaje espont&aacute;neo fue importante, lograba formar frases de 3 a 4 palabras y presentaba una mejor&iacute;a parcial en el lenguaje receptivo. Se continu&oacute; con VPA a 25 mg/kg/d&iacute;a y se decidi&oacute; iniciar con flunarizina (FNR) en dosis de 2.5 mg/d&iacute;a. Despu&eacute;s del inicio de la FNR se observ&oacute; mejor&iacute;a en el lenguaje (en la cantidad de vocabulario, la pronunciaci&oacute;n de m&aacute;s de 100 palabras y la capacidad de iniciar una conversaci&oacute;n espont&aacute;nea); las ecolalias persistieron pero en menor cantidad. Los padres mencionaron que inici&oacute; con conducta agresiva por lo que se suspendi&oacute; la FNR. En la siguiente consulta se mencion&oacute; una disminuci&oacute;n considerable en el lenguaje espont&aacute;neo en opini&oacute;n de los padres y del terapeuta, por lo que se reinstal&oacute; el medicamento con una dosis de 1.5 mg/d&iacute;a.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v68n1/a7f2.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">A los 20 meses de tratamiento se realiz&oacute; EEG de control en sue&ntilde;o inducido con hidrato de cloral en el que no se observ&oacute; actividad parox&iacute;stica (<a href="#f3">Figura 3</a>). En 24 meses de tratamiento con VPA, FNR y terapia de lenguaje, no se refirieron cambios conductuales ni otros eventos adversos; se increment&oacute; considerablemente la cantidad de lenguaje espont&aacute;neo y, hasta su m&aacute;s reciente evaluaci&oacute;n, no ha presentado crisis convulsivas.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v68n1/a7f3.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Se le realiz&oacute; una evaluaci&oacute;n neuropsicol&oacute;gica a los 24 meses con tratamiento farmacol&oacute;gico. Se report&oacute; un coeficiente intelectual verbal de 70, no verbal de 88, d&eacute;ficit leve en memoria visual, memoria verbal, habilidades espaciales, visomotoras y construccionales. D&eacute;ficit leve en lenguaje expresivo y severo en el receptivo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>DISCUSI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La p&eacute;rdida de lenguaje previamente adquirido resulta un reto diagn&oacute;stico en el que se deben descartar diferentes entidades, como los trastornos del espectro autista, los trastornos de ansiedad y las enfermedades neurodegenerativas. La evaluaci&oacute;n debe ser muy cuidadosa; debe realizarse una historia cl&iacute;nica completa con &eacute;nfasis en el neurodesarrollo y, posteriormente, evaluar el tipo de elementos diagn&oacute;stico a los cuales se someter&aacute; a cada caso en forma individualizada. El interrogatorio y el examen f&iacute;sico intencionados deben enfocarse en seleccionar los casos que se beneficiar&aacute;n con la realizaci&oacute;n de estudios como la resonancia magn&eacute;tica de cr&aacute;neo,el EEG y/o el tamizaje metab&oacute;lico ampliado, dado que hasta este momento no hay un algoritmo diagn&oacute;stico descrito para el padecimiento. La realizaci&oacute;n del EEG aporta informaci&oacute;n valiosa a&uacute;n en los casos sin sintomatolog&iacute;a neurol&oacute;gica y resulta particularmente &uacute;til para distinguir entre las enfermedades af&aacute;sicas que afectan el desarrollo ling&uuml;&iacute;stico.</font></p>  	    <p align="justify"><font face="verdana" size="2">El SLK es una enfermedad rara cuyo diagn&oacute;stico se realiza principalmente con los datos cl&iacute;nicos. Se caracteriza por afasia adquirida y anormalidades electroencefalogr&aacute;ficas en vigilia y durante el sue&ntilde;o, con o sin crisis convulsivas cl&iacute;nicas.</font></p>  	    <p align="justify"><font face="verdana" size="2">En este caso, las anormalidades electroencefalogr&aacute;ficas en el sue&ntilde;o, consistentes en complejos punta onda&#45;lenta de 3&#45;4 Hz, fueron clave para establecer el diagn&oacute;stico. Esta anormalidad es considerada por diversos autores como una caracter&iacute;stica mayor del s&iacute;ndrome, que debe observarse en 85% del registro en el sue&ntilde;o no&#45;REM.<sup>3,9&#45;11</sup> Aunque no fue posible realizar un estudio polisomnogr&aacute;</font><font face="verdana" size="2">fico y la paciente permaneci&oacute; en vigilia la mayor parte durante el EEG inicial, las manifestaciones cl&iacute;nicas y las anormalidades electroencefalogr&aacute;ficas fueron suficientes para fundamentar el diagn&oacute;stico.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Es importante diferenciar el SLK del cuadro de epilepsia con punta&#45;onda lenta continua durante el sue&ntilde;o (EPOCS), que es un s&iacute;ndrome epil&eacute;ptico que se caracteriza por la asociaci&oacute;n de varios tipos de crisis parciales y/o generalizadas durante el sue&ntilde;o y ausencias at&iacute;picas en vigilia.<sup>42,43</sup> En esta entidad se observan, adem&aacute;s, alteraciones neuropsicol&oacute;gicas como trastornos de conducta, descenso del coeficiente intelectual y trastornos del lenguaje,<sup>44</sup> trastornos motores transitorios como ataxia, dispraxia o diston&iacute;a<sup>45,46</sup>y anormalidades electroencefalogr&aacute;ficas caracter&iacute;sticas con actividad continua punta&#45;onda lenta durante el sue&ntilde;o no&#45;REM en m&aacute;s de 85% del registro. Para algunos autores ambos padecimientos pudieran considerarse diferentes espectros cl&iacute;nicos de una misma entidad determinados por la localizaci&oacute;n de la regi&oacute;n epil&eacute;ptica;<sup>10</sup> sin embargo, otros autores sustentan que las manifestaciones neuropsicol&oacute;gicas y los hallazgos electroencefalogr&aacute;ficos son diferentes en cada entidad.<sup>47</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En esta paciente la respuesta al tratamiento convencional con esteroides y anticonvulsivos fue parcial para el trastorno de lenguaje, por lo que se decidi&oacute; agregar FNR. Este medicamento se utiliza con frecuencia como profil&aacute;ctico de los brotes de migra&ntilde;a en ni&ntilde;os; tambi&eacute;n se ha probado su utilidad en la epilepsia refractaria como tratamiento concomitante al uso de antiepil&eacute;pticos. Sin embargo, hasta donde sabemos, no hay un precedente sobre su utilidad en pacientes con SLK.<sup>48&#45;51</sup> En estudios previos Pascual&#45;Castroviejo y cols. informaron la mejor&iacute;a en el lenguaje, en la conducta y en las alteraciones del EEG en 7 pacientes con SLK tratados con otro calcioantagonista, la nicardipina, a dosis de 1 a 2 mg/kg/d&iacute;a durante periodos que variaron de 2 meses hasta 9 a&ntilde;os. En estos casos el uso del medicamento se fundament&oacute; en el hallazgo de arteritis cerebral por medio de angiograf&iacute;a.<sup>52,53</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El pron&oacute;stico del s&iacute;ndrome es benigno desde el punto de vista del cuadro epil&eacute;ptico, aunque no puede afirmarse lo mismo sobre la recuperaci&oacute;n de lenguaje y la mejor&iacute;a en la conducta, que en la mayor&iacute;a de los casos son incompletas. En nuestro caso, la mejor&iacute;a en el lenguaje expresivo y receptivo fue considerable seg&uacute;n la evaluaci&oacute;n de los diferentes especialistas involucrados y de los padres. Eslava&#45;Cobos report&oacute; que, adem&aacute;s de las alteraciones en el lenguaje, en el SLK existen alteraciones en la conducta y en otras funciones cognitivas superiores.<sup>54</sup> Es evidente que nuestra paciente present&oacute; problemas de lenguaje y en otras &aacute;reas cognitivas.</font></p>  	    <p align="justify"><font face="verdana" size="2">Para concluir definitivamente sobre la utilidad cl&iacute;nica de la FNR en el s&iacute;ndrome se deber&aacute;n realizar estudios con un dise&ntilde;o metodol&oacute;gico que permita establecer su eficiencia, eficacia, dosificaci&oacute;n, duraci&oacute;n del tratamiento y medidas de &eacute;xito basadas en valoraciones neuropsicol&oacute;gicas antes y durante el tratamiento.</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. Landau WM, Kleffner FR. Syndrome of acquired aphasia with convulsive disorder in childhood. Neurology 1957;7:523&#45;530.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1523921&pid=S1665-1146201100010000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. Beaumanoir A. The Landau&#45;Kleffner syndrome. En: Roger J, Dravet C, Bureau M, Dreifuss FE, Wolf P, eds. Epileptic Syndromes in Infancy, Childhood and Adolescence. London: John Libbey; 1985. pp. 181&#45;191.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1523923&pid=S1665-1146201100010000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">3. Beaumanoir A. The Landau&#45;Kleffner syndrome. En: Roger J, Dravet C, Bureau M, Dreifuss FE, Wolf P, eds. Epileptic Syndromes in Infancy, Childhood and Adolescence. London: John Libbey; 1992. pp. 231&#45;244.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1523925&pid=S1665-1146201100010000700003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">4. Rapin I. Acquired aphasia in children. J Child Neurol 1995;10:267&#45;270.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1523927&pid=S1665-1146201100010000700004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">5. Deonna T. Acquired epileptiform aphasia in children (Landau&#45;Kleffner syndrome). J Clin Neurophysiol 1991 ;8:288&#45;298.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1523929&pid=S1665-1146201100010000700005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">6. Klein SK, Tuchman RF, Rapin I. The influence of premorbid language skills and behavior on language recovery in children with verbal auditory agnosia. J Child Neurol 2000;15:36&#45;43.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1523931&pid=S1665-1146201100010000700006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">7. Hirsch E, Marescaux C, Maquet P, Metz&#45;Lutz MN, Kiesmann M, Salmon E, et al. Landau&#45;Kleffner syndrome: a clinical and EEG study of five cases. Epilepsia 1990;31:756&#45;767.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1523933&pid=S1665-1146201100010000700007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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