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Polysomnography (PSG), a type of 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. ==Medical uses== Polysomnography is used to diagnose, or rule out, many types of sleep disorders including narcolepsy, idiopathic hypersomnia, periodic limb movement disorder (PLMD), REM behavior disorder, parasomnias, and sleep apnea. Although it is not directly useful in diagnosing circadian rhythm sleep disorders, it may be used to rule out other sleep disorders. Polysomnography should not be routinely used to screen for sleep disorders in workers who complain of insomnia or fatigue.〔, which cites *〕 Polysomnography should be avoided unless a person presents indications for polysomnography. (These indications include sleep apnea, obesity, a risky neck diameter, or risky fullness of the flesh in the oropharynx.〔) Alternatives to try first are changing the job schedule to make time for sufficient sleep and improving sleep hygiene.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「polysomnography」の詳細全文を読む スポンサード リンク
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