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TYPICAL ABSENCE SEIZURE

Background/Interictal/Activation

Please refer to specific syndromes and etiologies in which this seizure type occurs.

Ictal

Generalized spike-and-wave is mandatory. Regular 3 Hz generalized spike-and-wave occurs with typical absence seizures in childhood absence epilepsy. In absence seizures beginning in adolescence, faster irregular 3.5-6 Hz generalized spike-and-wave and polyspike-and-wave occurs.

CAUTION Slow spike-and-wave (<2.5Hz) right arrow consider atypical absence seizures

eeg
Example of 3Hz generalized spike-and-wave seen on the ictal EEG

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