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Polysomnography and other investigations for sleep disorders 

Polysomnography and other investigations for sleep disorders
Polysomnography and other investigations for sleep disorders

Zenobia Zaiwalla

and Roo Killick

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date: 17 May 2022

This chapter describes the key investigations used in the diagnosis of sleep disorders. The recording and value of polysomnography (PSG), with and without electroencephalography is discussed, including the specific parameters essential for the various sleep related breathing disorders. The technical aspects of the multiple sleep latency test and maintenance of wakefulness test are followed by interpretation of findings, recognizing their limitations, especially in adults with co-morbid disorders, and the effect of medication and also shift work. Finally, the value of wrist actigraphy as a diagnostic tool in circadian rhythm sleep–wake disorders is discussed. The chapter emphasizes the importance of selecting appropriate tests based on clinical information and the importance of units providing diagnostic studies for sleep disorders, constantly reviewing their study protocols and auditing inter-rater reliability of PSG sleep staging in children and adults of various ages and sleep disorders.

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