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Childhood absence epilepsy (CAE) is a common epilepsy syndrome primarily characterized by a sudden disturbance of consciousness and attention deficits. The onset age of CAE is usually between 4-10 years old and parents often observe brief staring spells in afflicted children, sometimes with rhythmic eye blinking or motor automatisms. During ictal period, typical generalized (bilateral, symmetric, and synchronous) 2.5-3.5 Hz spike and wave discharges (SWDs) can be captured by electroencephalogram (EEG) [1–3].