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We treated 52 mentally retarded patients with intractable seizures by adding valproic acid (VPA) to other drug regimens. Sixty-one percent improved clinically. VPA significantly reduced the frequency of generalized tonic-clonic seizures, generalized myoclonus, absence and atonic seizures. There was a significant correlation between clinical improvement and reduction of EEG paroxysmal activity.
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Chayasirisobhon et al. (1983) studied this question.
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