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[Reflex myoclonic epilepsy in infancy: a new reflex epilepsy syndrome or a variant of benign myoclonic epilepsy in infancy].

CASE REPORTS
We report a clinical and EEG study of 8 children with reflex myoclonic epilepsy of infancy to further confirm the existence of this syndrome first described by Ricci et al in 1995.


RESULTS
Between February 1990 to July 2002, we identified 64 epileptic patients with myoclonic seizures with an onset in the first six years of life. Eight (12.5%) of these patients had myoclonic seizure stimuli sensible. The seizures were characterized by generalized, myoclonic jerks triggered by tactile stimuli in six patients and acoustic stimuli in two, in one of them myoclonic jerks were triggered by both types of stimuli. The seizures appeared between 5 and 20 months of age. Two of the 8 patients had spontaneous myoclonic attacks during sleep. Interictal EEG was normal during wakefulness and occasional discharges were evident during sleep. In contrast, the ictal EEG during both wakefulness and sleep showed generalized spike wave and polyspike slow wave paroxysms. Neurologic examination, neuroimaging and neurometabolic studies were normal. Myoclonic jerks disappeared in 6 patients after valproic acid administration and in two after clobazan administration. Antiepileptic treatment was discontinued in 6 patients and no seizure recurrence was observed during a median follow up of 6 years.


CONCLUSION
Our patients presented electro clinical criteria compatible with the syndrome of reflex myoclonic epilepsy of infancy. This syndrome could be considered to be a new reflex epileptic syndrome or a variant of benign myoclonic epilepsy in infancy.