Polysomnography
Polysomnography (pronounced: /ˌpɒliːsɒmˈnɒɡrəfi/), often abbreviated as PSG, is a type of sleep study used to diagnose sleep disorders. Polysomnography records your brain waves, the oxygen level in your blood, heart rate and breathing, as well as eye and leg movements during the study.
Etymology
The term "polysomnography" is derived from the Greek words "poly" meaning many, "somno" meaning sleep, and "graphy" meaning to write. Thus, it literally means "writing many things during sleep".
Procedure
Polysomnography is usually performed at a sleep disorders unit within a hospital or at a sleep center. The test records several bodily functions during sleep, including brain activity, eye movement, oxygen and carbon dioxide blood levels, heart rate and rhythm, breathing rate and rhythm, the flow of air through your mouth and nose, snoring, body position, and chest and belly movement.
Related Terms
- Electroencephalogram (EEG): A test that measures and records the electrical activity of your brain.
- Electrooculography (EOG): A technique for measuring the resting potential of the retina.
- Electromyogram (EMG): A test that records the electrical activity of muscles.
- Electrocardiogram (ECG): A test that records the electrical activity of the heart.
See Also
External links
- Medical encyclopedia article on Polysomnography
- Wikipedia's article - Polysomnography
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