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Baptiste, Shirn L; Tang, Hai M; Kuzniecky, Ruben I; Devinsky, Orrin; French, Jacqueline A; Ludvig, Nandor
"Comparison of the antiepileptic properties of transmeningeally delivered muscimol, lidocaine, midazolam, pentobarbital and GABA, in rats"
Neuroscience letters 2010 Jan 29; 469(3):421-424
This study compared the potencies of epidurally delivered muscimol, lidocaine, midazolam, pentobarbital and gamma-aminobutyric acid (GABA) to prevent focal neocortical seizures induced by locally applied acetylcholine (Ach), in rats (n=5). An epidural cup was chronically implanted over the right somatosensory cortex in each animal, with epidural EEG electrodes placed posterior to the edge of the cup. After recovery, either artificial cerebrospinal fluid (ACSF; control solution) or one of the five drugs was delivered into epidural cup, followed by Ach administration into the cup to induce seizures. EEG seizure duration ratio was calculated for each drug delivery/seizure induction session to determine the potency of ACSF and the drugs to prevent the focal Ach-seizures. The concentration of all examined drug solutions was 1.0mM. ACSF, lidocaine, midazolam, pentobarbital and GABA all failed to prevent the Ach-induced neocortical EEG seizures, yielding EEG seizure duration ratios ranging from 0.41 to 0.80. In contrast, muscimol pretreatment fully prevented the development of ictal EEG in all animals. These results suggest that when used at low concentration muscimol was the best of the five drugs for transmeningeal pharmacotherapy trials for focal neocortical epilepsy

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