Key result
AFL alone linked to ~40% lower ischaemic stroke risk compared to AF alone.
Why the study?
Previous literature suggested lower ischaemic stroke risk in atrial flutter compared with atrial fibrillation, but large-scale studies with ECG documentation were lacking.
Does atrial flutter alone have a lower risk of ischaemic stroke compared to atrial fibrillation?
Cohort (n=40,986)
Yes
Does atrial flutter alone have a lower risk of ischaemic stroke compared to atrial fibrillation?
Relative Risk: 0.6 (95% CI 0.49–0.74)
Absolute Event Rate: 1.1% vs 1.9%
Patients with isolated atrial flutter have a substantially lower risk of ischaemic stroke compared to those with atrial fibrillation, suggesting clinically meaningful differences in thromboembolic risk.
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Isolated AFL associated with lower stroke risk than AF; hypothesis-generating for differential anticoagulation thresholds, needs prospective confirmation.
Fesseha et al. (2026) conducted a cohort in Atrial fibrillation and atrial flutter (n=40,986). Atrial flutter only vs. Atrial fibrillation only was evaluated on Ischaemic stroke (IRR 0.60, 95% CI 0.49-0.74). Patients with atrial flutter only had a substantially lower risk of ischaemic stroke compared to patients with atrial fibrillation only (adjusted IRR 0.60; 95% CI 0.49-0.74).
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