SREDA

SREDA: subclinical rhythmic electrographic discharges of adults

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Montage: unspecified

abrupt onset and termination, unlike seizures which evolve

rhythmic, sharply contoured theta

may evolve slow to fast (from 1-2 Hz to 5-6 Hz) like a "seizure in reverse"

duration: 20 sec to minutes

usually bisynchronous and symmetric

temporal-parietal distribution

widespread or bilateral, maximal posteriorly

at rest or in drowsiness

usually in normal adults (50 and older)

uncommon

may be mistaken for epileptiform activity