Abstract
Background
Severe obstructive sleep apnea (OSA) is a risk factor for mortality. The ability of continuous positive airway pressure (CPAP) therapy to mitigate this increased risk of death has not been studied in Chinese adults. The objective of our study was to compare mortality in Chinese patients with simple snoring, untreated OSA, and OSA treated with CPAP.
Methods
We recruited adults with OSA or simple snoring from our sleep medicine clinic. OSA was diagnosed using standard polysomnography. Subjects were followed at least annually for a mean of 8.9 years (SD 1.9). CPAP compliance was checked with the built-in meter. We then assessed all-cause mortality.
Results
Five hundred fifty simple snorers, 257 with untreated mild OSA, 316 with untreated moderate OSA, 457 with untreated severe OSA, and 235 with mild to severe OSA treated with CPAP were included. Simple snorers had a much lower mortality rate (2.98 per 1000 person-years [95 % CI, 2.93 to 3.02]) than the untreated severe OSA group (11.07 per 1000 person-years [95 %CI, 10.86 to 11.29]; P < 0.0001). Compared with simple snorers, fully adjusted mortality was highest in the untreated, severe OSA group (hazard ratio [HR], 3.51 [95 %CI, 1.93 to 6.39]). Treatment of severe OSA patients with CPAP eliminated this increase in mortality (HR, 0.81[95 %CI, 0.36–1.86]).
Conclusions
Severe OSA significantly markedly increases the risk of death in Chinese patients and CPAP treatment with adequate compliance reduces this risk.
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Acknowledgments
The authors thank the numerous participants, the collaborating clinicians, and the research staff involved throughout the study.
Conflict of interest
We declare that we have no financial or personal relationships that can inappropriately influence this work. There are no professional or other personal interests of any nature in any product, service and/or company that could be construed as influencing the content of this manuscript. The paper has not been presented at any conference.
Funding
This study was supported by the Capital Health Research and Development of Special Grants (2011-2003-05), National Natural Science Foundation of China (81271062), and the Beijing Municipal Natural Science Foundation (3500–11320005).
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Yuan, X., Fang, J., Wang, L. et al. Adequate continuous positive airway pressure therapy reduces mortality in Chinese patients with obstructive sleep apnea. Sleep Breath 19, 911–920 (2015). https://doi.org/10.1007/s11325-014-1091-9
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DOI: https://doi.org/10.1007/s11325-014-1091-9