Clnical answer: Yes. Untreated OSA is an independent risk factor for AF, and the evidence base is now stronger and more mechanistic than a simple association. The American Heart Association states OSA is an independent AF risk factor even without other cardiac disease, though a fully proven causal pathway is still being established.

Source of Recommendation: B

Evidence used: A meta-analysis of 54,271 patients found AF incidence was 88% higher in people with OSA. A separate cohort meta-analysis found a pooled relative risk of 1.70 for AF in sleep apnea/hypopnea syndrome. In MESA, OSA phenotypes marked by high hypoxic burden or a strong heart rate response carried an adjusted hazard ratio of 1.68 for incident AF, while lower risk OSA phenotypes did not reach significance. This points to hypoxemia and autonomic stress as the real drivers, not OSA as a single uniform category. Mechanistically, repeated apnea events cause atrial structural and electrical remodeling over time, including fibrosis and chamber dilation, which builds the substrate for AF. Acutely, one case crossover study found the odds of AF onset within 90 seconds of a respiratory event were about 18 times higher than during normal breathing, and nights with more severe apnea carried a 2.3 times higher risk of an hour or more of AF that same day. Left untreated, OSA also worsens AF outcomes, including higher recurrence after cardioversion and about 31% higher recurrence after pulmonary vein isolation. Observational data suggest CPAP lowers recurrence by around 42%, though randomized trials have not yet confirmed a causal treatment benefit.

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