Journal
SLEEP MEDICINE REVIEWS
Volume 16, Issue 1, Pages 27-45Publisher
W B SAUNDERS CO LTD
DOI: 10.1016/j.smrv.2011.02.003
Keywords
Sleep; Polysomnography; Arousals; Cyclic alternating pattern; Sleep disorders
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Cyclic alternating pattern CAP is the EEG marker of unstable sleep, a concept which is poorly appreciated among the metrics of sleep physiology. Besides, duration, depth and continuity, sleep restorative properties depend on the capacity of the brain to create periods of sustained stable sleep. This issue is not confined only to the EEG activities but reverberates upon the ongoing autonomic activity and behavioral functions, which are mutually entrained in a synchronized oscillation. CAP can be identified both in adult and children sleep and therefore represents a sensitive tool for the investigation of sleep disorders across the lifespan. The present review illustrates the story of CAP in the last 25 years, the standardized scoring criteria, the basic physiological properties and how the dimension of sleep instability has provided new insight into pathophysiolology and management of sleep disorders. (C) 2011 Elsevier Ltd. All rights reserved.
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