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№ 231Neurology11 min read

Polysomnography

1. Big picture

Polysomnography (PSG) is the most complete sleep-laboratory investigation. In the exam, you should describe it as overnight multiparametric monitoring of sleep, breathing, heart rhythm, oxygenation, movements, and sleep stages.

The examiner usually wants three things:

  1. What is recorded? EEG, electrooculogram, chin EMG, ECG, airflow, respiratory effort, oxygen saturation, body position, snoring, limb EMG.

  2. What is it used for? Mainly obstructive sleep apnea, central sleep apnea, sleep-related hypoventilation, periodic limb movement disorder, parasomnias, REM sleep behavior disorder, and as preparation before Multiple Sleep Latency Test for n

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