We reviewed all documented cases of spontaneous seizures that followed convulsive therapy. Nineteen studies provided information in 81 cases. The average annual incidence of spontaneous seizures was 114 per 100,000, 5 times more frequent than an age-adjusted nonpsychiatric cohort. Host susceptibility rather than treatment features influenced seizure development. A longer latency to first seizure was associated with greater likelihood of seizure recurrence, a relationship also observed in posttraumatic epilepsy.
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Devinsky et al. (1983) studied this question.
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