Electroencephalography
Pronunciation: ih-lek-tro-en-sef-uh-LOG-rah-fee
Also written as: EEG — Electroencephalography
A diagnostic test that records electrical activity in the brain using electrodes placed on the scalp.
Full Definition
Electroencephalography (EEG) is a non-invasive neurophysiological monitoring method that records electrical activity generated by the brain. In epilepsy care, EEG is essential for detecting interictal epileptiform discharges, characterizing seizure patterns, and guiding treatment decisions. Standard EEG typically lasts 20-60 minutes, while prolonged monitoring may extend for days. The test can identify focal versus generalized abnormalities, help classify epilepsy syndromes, and monitor treatment response. Activation procedures like hyperventilation, photic stimulation, and sleep deprivation may be used to increase the yield of abnormal findings.
Usage
Usage note: Commonly abbreviated as EEG in clinical practice.
In Context
- "The electroencephalography showed focal sharp waves over the left temporal region." — Diagnostic test report
- "Serial electroencephalography monitoring was performed to assess treatment response." — Clinical documentation