electroencephalogram
A diagnostic test recording electrical activity of the brain, universally abbreviated as EEG in clinical practice.
Full Definition
An electroencephalogram (EEG) is a non-invasive neurophysiological test that records electrical activity generated by neurons in the cerebral cortex through electrodes placed on the scalp. EEGs are essential for diagnosing epilepsy, assessing altered consciousness, monitoring brain function during surgery, and evaluating various neurological conditions. The test can be performed as a routine recording, sleep study, or continuous monitoring, with specific protocols for activation procedures and electrode placement. Clinical reports must specify the type of EEG performed, background rhythm characteristics, any abnormal findings, and clinical correlation with symptoms.
Usage
Usage note: Spell out fully in formal headings, abbreviate as EEG in clinical notes; distinguish from ECG (electrocardiogram) and EMG (electromyogram).
In Context
- "The electroencephalogram showed bilateral temporal sharp waves consistent with complex partial seizures." — Neurophysiology report
- "Continuous electroencephalogram monitoring was initiated to detect subclinical seizure activity in the ICU." — Critical care documentation