Polysomnography and Sleep Stages.3,18
15.11.4 Polysomnography and Sleep Stages.3,18
Polysomnography is the monitoring of various physiologic parameters simultaneously during sleep, including the following:
▪ EEG: standard electrodes are used (see 15.11.2, Electroencephalographic Terms)
▪ Electro-oculogram (EOG): tracings are obtained from the left eye and right eye
▪ Electromyogram (EMG): submental (chin) EMG, leg muscle EMG, eg, left anterior tibialis, right anterior tibialis
▪ Respiratory function, eg, oxygen saturation (SaO2), expired CO2, and tidal volume (Vt) (see 15.16, Pulmonary, Respiratory, and Blood Gas Terminology)
▪ Electrocardiogram (ECG): see 15.3.1, Cardiology, Electrocardiographic Terms
Sleep stages are as follows19:
rapid-eye movement sleep (REM sleep)
non-rapid eye movement (non-REM) sleep (NREM sleep)
sleep stage 1
sleep stage 2
sleep stage 3
sleep stage 4