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Polysomnography and Sleep Stages 

Polysomnography and Sleep Stages

Harriet S. Meyer

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date: 20 January 2020

,Polysomnography is the monitoring of various physiologic parameters simultaneously during sleep, including the following: ▪ EEG: standard electrodes are used (see , 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 , Pulmonary, Respiratory, and Blood Gas Terminology) ▪ Electrocardiogram (ECG): see , Cardiology, Electrocardiographic Terms Sleep stages are as follows: rapid-eye movement sleep (REM sleep) non-rapid eye movement (non-REM) sleep (NREM sleep) sleep

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