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- W2014169756 abstract "Summary: We previously demonstrated that the dihydropyridine calcium channel blocker, nimodipine, is an effective anticonvulsant in experimental seizures when administered parentally. Reported now are the results for the oral administration of nimodipine in pentylenetetrazole (PTZ)-induced seizures in the rabbit. Twenty rabbits were randomly assigned into 10 controls and 10 treated with nimodipine 5 mg/kg/day orally for 5 days. All animals received increasing doses of the convulsant PTZ intravenously (i.v). The epileptogenecity of this agent was assessed in all animals (mg/kg) by four electrocorti-cographic criteria: first seizure >5 s, two seizures within 5 min, epileptiform activity for 1 h, and status epilepticus. In all four categories, nimodipine increased the seizure threshold by 50–60%. The dose of PTZ required to produce the first seizure was 27.0 ± 5.4 mg/kg in controls and 49.6 ± 9.9 mg/kg in treated animals (p < 0.001). Similar values were obtained for the other three electrocorti-cographic categories. There were no observable adverse side effects. The results confirm our previous findings that calcium influx is critical for seizure induction, and that selective central nervous system (CNS) calcium channel blockers may emerge as a new class of anticonvulsants. RÉSUMÉ Nous avons antérieurement démontré que la nimodipine, blo-queur du canal calcique dihydropyridinique, est un anticonvulsi-vant efficace après administration parentéral. Nous rapportons ici les résultats de l'administration orale de nimopidine dans les crises induites par le pentylénetétrazole chez le lapin. 20 lapin ont été répartis au hasard en 2 groupes de 10 témoins et 10 ani-maux traités par nimopidine per os, 5 mg/kg/j pendant 5 jours. Chaque animal a recu des doses croissantes de pentylénetétrazole IV. L'éfficacité epileptogenique de ce produit a été testée pour chaque animal (mg/kg) par 4 critères électrocorticogra-phiques première crise supérieure à 5 secondes, survenue de 2 crises en 5 minutes, activité paroxystique pendant une heure, survenue d'un état de mal épileptique. Dans les quatre catégories, la nimopidine a élevé le seuil convulsivant de 50 à 60%. La dose de pentylenetetrazole nécessaire à l'obtention de la p̂remière crise a été de 27,0 ± 5,4 mg/kg chez les témoins contre 49,6 ± 9,9 mg/kg chez les animaux traités (p < 0.001). Des va-leurs similaires ont été observées pour les autres catégories électrocorticographiques. II n'y a pas eu d'effet collatéral indésirable observable. Ces résultats confirment nos constatations antérieures, selon lesquelles l'influx de calcium est primordial dans l'induction des crises, et les bloqueurs sélectifs des canaux calciques dans le systeme nerveux central se profilent comme une nouvelle classe d'anticonvulsivants." @default.
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- W2014169756 date "1987-08-01" @default.
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- W2014169756 title "Suppression of Pentylenetetrazole Seizures by Oral Administration of a Dihydropyridine Ca<sup>2+</sup>Antagonist" @default.
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- W2014169756 doi "https://doi.org/10.1111/j.1528-1157.1987.tb03666.x" @default.
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