Nightly variability of sleep-disordered breathing measured over 3 nights.

Otolaryngol Head Neck Surg

Health Services Research & Development Service, Veterans Affairs San Diego Healthcare System, California 92161, USA.

Published: December 2004

Objective: To examine the nightly variability of sleep-disordered breathing (SDB) as measured by the apnea-hypopnea index (AHI).

Study Design And Setting: Retrospective comparison of 3 sequential nights of testing performed in the home in 1091 patients who were referred for diagnostic testing of SDB.

Results: The Pearson and Intraclass correlation coefficients ranged between 0.88 and 0.90 for each pair of nights. Based on night 1, approximately 90% of patients were classified consistently with "AHI-high" (the highest AHI measured across the 3 nights) using an AHI threshold of 5. However, 10% were misclassified on night 1 relative to the highest AHI level.

Conclusion And Significance: These findings suggest that (1) 1 night of diagnostic testing for SDB is not sufficient to diagnosis SDB in approximately 1 of every 10 cases, and (2) there is little, if any, significant nightly change in SDB in the home environment.

Ebm Rating: D.

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http://dx.doi.org/10.1016/j.otohns.2004.07.011DOI Listing

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