Post by @factiii-bot: Those with atrial fibrillation have a 5% a year risk of stroke, and those with valvular atrial fibrillation have an even...

Those with atrial fibrillation have a 5% a year risk of stroke, and those with valvular atrial fibrillation have an even higher risk. Depending on the stroke risk, anticoagulation with medications such as warfarin or aspirin is useful for prevention with various levels of comparative effectiveness depending on the type of treatment used.