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News
Not all irregular heartbeats are created equal. A major Finnish study found that patients with atrial flutter (AFL) alone had a 40% lower rate of ischaemic stroke compared to those with atrial fibrillation (AF) alone. But patients with both conditions faced an 11% higher stroke rate — raising fresh questions about how we tailor anticoagulation strategies.
Not all irregular heartbeats carry the same risk. A large nationwide study out of Finland found that patients with atrial flutter (AFL) alone had a 40% lower rate of ischaemic stroke compared to those with atrial fibrillation (AF) alone. Meanwhile, patients who had both AFL and AF faced an 11% higher stroke rate than AF-only patients — suggesting the combination may be particularly dangerous.
The study analyzed over 532,000 digitally interpreted ECGs from nearly 41,000 patients collected between 2007 and 2018, making it one of the most comprehensive real-world analyses of stroke risk across these two arrhythmias. Crucially, the lower stroke risk in AFL-only patients held up even in analyses restricted to the period before anticoagulation or catheter ablation was initiated.
By the Numbers:
Why it matters: These findings challenge the assumption that AFL and AF carry equivalent thromboembolic risk, and could prompt clinicians to reconsider whether current one-size-fits-all anticoagulation guidelines need to be refined for AFL patients.
