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Summary: To study the effect of age on seizure latency, intensity, reproducibility, and mortality in genetically epilepsy‐prone rats of the severe colony (GEPR‐9s), 472 seizure‐naive rats, ranging in age from 14 to 65 days, received a series of three audiogenic stimulations. Both the percentage of rats having one or more seizures and the percentage of seizures that were stage 9 generally increased with advancing age of the animal at the time of the first stimulation. Mean latency to seizure onset decreased while seizure intensity increased with increasing age of the animal. Reproducibility of seizure stage also increased with advancing age of the animal. The effects of senescence on seizure susceptibility were also investigated in an additional 18 prepubescent rats (25–35 days) who received three audiogenic stimulations and were tested again between the ages of 480 and 540 days with identical testing procedures. No significant changes occurred with either latency to seizure onset or seizure intensity in rats tested during prepubescence and again at senescence. Although GEPR‐9s provide an excellent model of inherited seizures, latency to seizure onset, seizure intensity, and seizure reproducibility is dependent on age of the animal. Once established, however, audio‐genic‐induced seizures persist throughout life. RÉSUMÉ Afin d'étudier les effets de l'âge sur la latence, l'intensité, la reproductibilité et la mortalité des crises chez des rats génétiquement prédisposés a une épilepsie sévère (GEPR‐9s), 472 rats non épileptiques, âgés de 14 à 65 jours, ont reçu une série de trois stimulations audiogéniques. Le pourcentage des rats présentant une ou plusieurs crises et le pourcentage de crises de stade 9 ont globalement augmenté avec l'âge de l'animal au moment de la première stimulation. La latence moyenne du début des crises a diminué, l'intensité des crises a augmenté avec l'âge. La reproductibilité des crises et du stade des crises a également augmenté avec l'âge. Les effets de la sénescence sur la susceptibilityé aux crises ont étéétudiés chez 18 rats pré‐pubères supplémentaires (âgés de 25 à 35 jours) qui ont reçu trois stimulations audiogéniques et qui ont été testés à nouveaus aux âges de 480–540 jours par les mêmes épreuves. Les auteurs n'ont pas constaté de modifications significatives de la latence des crises ou de l'intensité des crises chez les rats testés à l'état pré‐pubertaires et re‐testés pendant la sénescence. Les GEPR‐9s fournissent un excellent modèie pour les crises héréditaires, mais la latence des crises, l'intensité des crises et la reproductibilité des crises déjendent de l'âge de 1'animal. Une fois qu'elles sont établies, les crises audiogéniques persistent cependant pendant toute la vie de l'animal. RESUMEN Para estudiar los efectos de la edad sobre la latencia de los ataques, su intensidad, su reproducibilidad y la mortalidad en ratas de una colonia (GEPR‐9s) de ratas genéticamente susceptibles a epilepsyía, se ha realizado una serie de 3 estímulos audiogéaicos en 472 ratas‐naive con una edad que variaba en 14 y 65 déas. Tanto el porcentaje de ratas que mostraron uno o más ataques, como el porcentaje de ataques que alcanzaron el nivel 9, se incrementaron en relación con el aumento de la edad del animal en el momento de la primera estimulación. La latencia media hasta el momento del ataque se redujo mientras que la intensidad de los ataques se incrementó al aumentar la edad del animal. La reproductibilidad de los ataques también se incrementó con la edad avanzada del animal. Los efectos de la senescencia sobre la susceptibilidad de los ataques fueron también investigados en un grupo de 18 ratas prepuberales (25–35 días) que recibieron 3 estímulos audiogénicos y fueron examinadas nuevamente a las edades de 480–540 días utilizando idénticos procedimientos de análisis. No se observaron cambios significa‐tivos en lo que respecta a la latencia del comienzo del ataque o a la intensidad de los mismos en las ratas examinadas durante la pubertad y, posteriormente, la senescencia. Mientras que las GEPR‐9s proporciona un excelente modelo para estudiar los ataques heredados, la lacencia del comienzo de los ataques, la intensidad de los ataques y su reproductibilidad depende de la edad del animal. Sin embargo, una vez establecidos, los ataques inducidos audiog^nicamente persisten durante toda la vida del animal.
Epilepsia – Wiley
Published: Apr 1, 1991
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