Epileptiform discharge
Abnormal EEG pattern resembling epileptic activity but not necessarily associated with clinical seizures.
Full Definition
Epileptiform discharges are distinctive EEG patterns characterized by sharp, high-amplitude waveforms that resemble those seen during actual seizures but occur in the interictal period without associated clinical symptoms. These discharges include spikes, sharp waves, spike-and-wave complexes, and other paroxysmal patterns that stand out clearly from background activity. While strongly suggestive of epilepsy, epileptiform discharges can occasionally be found in individuals without seizures and must be interpreted in clinical context. Their frequency and characteristics can provide important diagnostic and prognostic information.
Usage
Usage note: Distinguish from normal variants and artifacts; clinical correlation essential for interpretation.
In Context
- "Routine EEG captured frequent epileptiform discharges over the left temporal region." — EEG interpretation report
- "The absence of epileptiform discharges does not rule out epilepsy in this clinical context." — Clinical correlation note