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Seah SJS, Chiu ST, Thant AT, Chan SP, Ou YH, Teo YH, Wong S, Koo CY, Barbé F, Lee CH. Hour-to-hour variability of respiratory sleep indices and ambulatory blood pressure. Sleep 2023; 46:6708255. [PMID: 36130168 DOI: 10.1093/sleep/zsac227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 09/14/2022] [Indexed: 11/13/2022] Open
Abstract
STUDY OBJECTIVES Respiratory sleep indices are traditionally reported on the basis of the average total sleep time. The relationship between the hour-to-hour variability of these parameters and blood pressure (BP) has not been reported. METHODS We evaluated the associations of the hour-to-hour variability of the apnea-hypopnea index (AHI), oxygen desaturation index (ODI), and lowest oxygen saturation with the 24-h ambulatory BP in patients with hypertension and newly diagnosed obstructive sleep apnea. A total of 147 patients underwent polysomnography, based on which obstructive sleep apnea was diagnosed in 106 patients; these patients underwent 24-h ambulatory BP monitoring within the next 30 days. Each polysomnogram was divided into hourly reports to calculate the variability of the respiratory sleep indices. Variability independent of the mean was considered the primary measure of variability. RESULTS The median number of hourly polysomnogram reports was 7 (range, 4-8). The hour-to-hour variability of both AHI and ODI, but not of the lowest oxygen saturation, was correlated with the 24-h pulse pressure, 24-h systolic BP, and awake systolic BP (p < 0.05 for all). The fully adjusted linear regression analysis indicated that the hour-to-hour variability of AHI and ODI remained associated with the 24-h pulse pressure (AHI: β coefficient, 0.264 [95% CI = 0.033-0.495], p = 0.026; ODI: β coefficient, 0.450 [95% CI = 0.174-0.726], p = 0.002). CONCLUSIONS The hour-to-hour variability of AHI and ODI is independently associated with the 24-h pulse pressure. Further investigations are warranted to evaluate the clinical relevance of this new-found association.
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Affiliation(s)
- Shawn Jing-Sheng Seah
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Shi Ting Chiu
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - As Tar Thant
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Siew Pang Chan
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Cardiovascular Research Institute, National University Heart Centre Singapore, Singapore, Singapore
| | - Yi-Hui Ou
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Yao Hao Teo
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Serene Wong
- Fast and Chronic Programmes, Alexandra Hospital, National University Health System, Singapore, Singapore
| | - Chieh-Yang Koo
- Department of Cardiology, National University Heart Centre Singapore, Singapore, Singapore
| | - Ferran Barbé
- Translational Research in Respiratory Medicine, Hospital Arnau de Vilanova-Santa Maria, IRBLleida, Lleida, CIBERES, Madrid, Spain
| | - Chi-Hang Lee
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Cardiovascular Research Institute, National University Heart Centre Singapore, Singapore, Singapore.,Department of Cardiology, National University Heart Centre Singapore, Singapore, Singapore
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