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Polysomnography and Sleep Stages 

Polysomnography and Sleep Stages

Harriet S. Meyer

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Polysomnography and Sleep Stages


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

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