epileptiform activity


epileptiform activity
interictal activity on an electroencephalogram, characterized by paroxysmal spike, polyspike, or sharp wave discharges; it may occur in patients who have never had a seizure, and it does not occur in all epileptics. Called also epileptiform discharges.

Epileptiform activity during an absence seizure, characterized by high-amplitude, 3-Hertz spike and wave discharge emerging from a normal electroencephalographic (EEG) background, rarely lasting longer than 2 to 10 seconds, and abruptly stopping with resumption of normal activity. The discharge is strictly regular, bilateral, and most prominent in frontal leads (Fp1–F7, Fp1–F3, FZ–CZ, Fp2–F4, Fp2–F8).


Medical dictionary. 2011.

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