Polysomnography

Polysomnography (PSG), also known as a sleep study, is a multi-parametric test used in the study of sleep and as a diagnostic tool in sleep medicine. The test result is called a polysomnogram, also abbreviated PSG. The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").

Polysomnography is a comprehensive recording of the biophysiological changes that occur during sleep. It is usually performed at night, when most people sleep, though some labs can accommodate shift workers and people with circadian rhythm sleep disorders and do the test at other times of day. The PSG monitors many body functions including brain (EEG), eye movements (EOG), muscle activity or skeletal muscle activation (EMG) and heart rhythm (ECG) during sleep. After the identification of the sleep disorder sleep apnea in the 1970s, the breathing functions respiratory airflow and respiratory effort indicators were added along with peripheral pulse oximetry.

Read more about PolysomnographyIndications, Mechanism, Procedure, Interpretation, "Split Night" Study

Other articles related to "polysomnography":

Sleep Medicine - Diagnostic Methods
... It is cost-efficient when full polysomnography is not required ... Polysomnography is performed in a sleep laboratory while the patient sleeps, preferably at his or her usual sleeping time ... Polysomnography is not routinely used in the evaluation of patients with insomnia or circadian rhythm disorders, except as needed to rule out other disorders ...
Polysomnography - "Split Night" Study - Example of Summary Report From A "split Night" Study
... During the first 71 minutes of sleep Mr ... B____ manifested 83 obstructive apneas, 3 central apneas, 1 mixed apnea and 28 hypopneas, for an elevated apnea+hypopnea index (AHI) of 97 events/hr (*"severe" OSA) ...
Non-rapid Eye Movement Sleep - Polysomnography
... Polysomnography (PSG) is a test used in the study of sleep the test result is called a polysomnogram ...
Charcot-Wilbrand Syndrome - Detection Methods - Polysomnography
... A Polysomnography test (PSG) records the biological changes during sleep through monitoring the brain (Electroencephalography, EEG), eye movement (Electrooculography, EOG), heart ...
Actigraphy - Purpose - Sleep
... Contrary to polysomnography, the patient remains movable and does not necessarily need to be located in a laboratory while the required data is being recorded ... Sleep actigraphs are also more affordable than performing a polysomnography and can therefore be advantageous as well, particularly when conducting large field tests ... but is increasingly being employed in sleep clinics to replace full polysomnography ...