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polysomnography
Pronunciation: pol-ee-som-NOG-rah-fee
A comprehensive sleep study that records multiple physiological parameters during sleep.
Full Definition
Polysomnography (PSG) is a multi-parameter neurodiagnostic test conducted during sleep to evaluate sleep disorders. The study simultaneously records brain waves (EEG), eye movements (EOG), muscle activity (EMG), heart rhythm, breathing patterns, oxygen saturation, and limb movements. Polysomnography is the gold standard for diagnosing sleep apnea, periodic limb movement disorder, REM sleep behavior disorder, and other sleep-related conditions. The test typically requires an overnight stay in a specialized sleep laboratory.
Usage
Usage note: Commonly abbreviated as PSG in medical records.
In Context
- "Polysomnography revealed severe obstructive sleep apnea with an apnea-hypopnea index of 45 events per hour." — Sleep medicine report
- "The patient was scheduled for in-laboratory polysomnography to evaluate suspected REM sleep behavior disorder." — Sleep clinic referral
Also known as
PSG
sleep study
Don't confuse with
polyelectrogram
polygraph