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Nocturnal oxygen saturation is associated with all-cause mortality: a community-based study
Bin Yan1, Yang Gao2, Zhanqin Zhang3
1Department of Clinical Research Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
Summary
Nocturnal oxygen saturation (SpO2) monitoring can predict all-cause mortality in the general population. Improving nocturnal hypoxemia is crucial for better health outcomes.
Area of Science:
- Cardiology
- Sleep Medicine
- Public Health
Background:
- Observational studies suggest a link between single-point oxygen saturation (SpO2) measurements and mortality.
- Nocturnal SpO2 levels have not been extensively studied as predictors of mortality in community-based populations.
Purpose of the Study:
- To investigate the association between nocturnal SpO2 levels and all-cause mortality.
- To determine if nocturnal SpO2 can serve as a predictive marker for mortality in a general community sample.
Main Methods:
- Utilized data from the Sleep Heart Health Study, including 5,086 participants (mean age 63.8 years).
- Measured SpO2 during total sleep time (SpO2-TOTAL) using overnight in-home polysomnography.
- Employed multivariable Cox proportional hazards analysis to assess mortality risk.
Main Results:
- Over a 10.7-year follow-up, 1,110 (22.7%) deaths occurred.
- Average SpO2-TOTAL was significantly associated with all-cause mortality (HR 0.93; P < .001) after adjustment.
- Maximum and minimum SpO2-TOTAL also predicted mortality (HRs 0.91 and 0.98, respectively; P = .001).
- Nocturnal hypoxemia showed a significant association with increased all-cause mortality.
Conclusions:
- Nocturnal SpO2 levels are important indicators of all-cause mortality risk in the general population.
- Monitoring nocturnal SpO2 and managing hypoxemia may improve health outcomes.
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