Intermediate
Technical
IVT
sharp wave
A clearly distinguishable EEG waveform with pointed peak and duration of 70-200 milliseconds.
Full Definition
Sharp waves are transient EEG waveforms that stand out from background activity with a characteristic pointed morphology. They have a duration between 70 and 200 milliseconds and are distinguished from spikes by their longer duration. Sharp waves may occur in normal individuals during drowsiness or sleep, but when occurring in awake patients or in focal patterns, they may indicate underlying cortical irritability or epileptogenic potential. The distinction between sharp waves and spikes is clinically important for seizure risk assessment.
Usage
Usage note: Hyphenate when used as compound modifier; distinguish clearly from 'spike' in clinical contexts.
In Context
- "Intermittent sharp waves were noted in the left temporal region during wakefulness." — EEG interpretation
- "The patient showed frequent sharp wave discharges that increased during hyperventilation." — Clinical neurophysiology report
Also known as
sharp transient
Don't confuse with
spike
sharp-slow wave complex