The field of sleep medicine has grown up around the main test used to measure disorders of sleep: the polysomnogram (PSG). The PSG is a comprehensive, technologyheavy test that requires special facilities, specially trained technologists, and careful scoring of the record to yield a meaningful result. Almost since PSG came into widespread clinical use, the field of sleep medicine has sought alternatives to PSG that would give an accurate measure of sleep apnea. As obstructive sleep apnea (OSA) is the most common reason that a PSG is performed, it is reasonable to focus on OSA in developing non-PSG techniques for accurately diagnosing this particular disorder.
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