SREDA (subclinical rhythmic electrographic discharges in adults)

SREDA (Subclinical rhythmic electrographic discharge in adults)

• Abrupt onset and termination of sharp rhythmic theta rhythm of 5-7Hz
• Constant frequency
• Duration of 40-80 sec
• Located Parietal and Posterior temporal
• Bilateral and synchronous, symmetrical (however sometimes unilateral)
• No change in localization of frequency
• Present in wakefulness, drowsiness, stage II sleep
• Trigger: Hyperventilation
• Usually in people >50 years
• Uncommon (incidence <0.05%)

• Not associated with epilepsy

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SREDA: bilateral synchronous parietotemporal sharp theta rhythm (double banana)

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