electroencephalogram
Pronunciation: ih-lek-troh-en-SEF-uh-loh-gram
A diagnostic test that records electrical activity in the brain using electrodes placed on the scalp.
Full Definition
An electroencephalogram (EEG) is a non-invasive diagnostic procedure that measures and records the electrical activity of the brain through electrodes positioned on the scalp. The test captures brain wave patterns that help diagnose conditions such as epilepsy, sleep disorders, brain tumors, and other neurological conditions. EEG recordings are interpreted by neurophysiologists who analyze the frequency, amplitude, and morphology of brain waves. The procedure typically lasts 20-40 minutes and may be performed during sleep or wakefulness depending on the clinical indication.
Usage
Usage note: Always spell out in full on first use in patient documentation, followed by (EEG).
In Context
- "The electroencephalogram revealed abnormal spike-wave complexes consistent with generalized epilepsy." — Clinical neurophysiology report
- "Patient consent was obtained for the 24-hour ambulatory electroencephalogram monitoring." — Medical procedure documentation