OSA severity and cardiovascular risk
In >10,000 sleep-study patients, higher apnea–hypopnea burden predicted cardiovascular events and death over years of follow-up.
Source
Obstructive sleep apnea and risk of cardiovascular events and all-cause mortality: a decade-long historical cohort study
What they did
Adults undergoing diagnostic polysomnography were linked to administrative outcomes; investigators modelled AHI and oxygen-desaturation metrics against a composite of CV events and mortality.
What they found
Of 10,149 included patients, 11.5% had a composite event over median 68 months. Higher AHI related to higher hazard (e.g., HR 1.49 comparing high vs low AHI in univariate modelling).
The limits
What it doesn't show
Observational sleep-lab cohorts have referral bias; CPAP claims were not clearly protective in adjusted models.
Key terms
- OSA
- Obstructive sleep apnea.
- AHI
- Apnea–hypopnea index (events/hour).
- TST90
- Sleep time with SpO2 <90%.
- Composite CV outcome
- Combined CV hospitalisation/events and death.
- Polysomnography
- Overnight sleep study.
- Hazard ratio
- Relative instantaneous event risk.
Flashcards
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Analysed N:
Common questions
Analysed N?
10,149.
Events?
1,172 (11.5%).
Follow-up?
68 months median.
AHI contrast HR?
1.49 univariate.
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