Lone atrial flutter carries a stroke risk at least as high as lone atrial fibrillation and a high risk of subsequent atrial fibrillation, suggesting anticoagulation should be considered for patients older than 65 years.
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Atrial flutter was associated with higher thromboembolic risk than AF; leaves open whether anticoagulation thresholds should extend to flutter.
Halligan et al. (2004) studied this question.
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