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Patients with atrial fibrillation are at higher risk of suffering stroke and other complications related to the development of blood clots in their heart. Until 2010, the only oral anticoagulant (blood thinner) to prevent strokes in Afib was warfarin (Coumadin®). Now there are two new oral anticoagulants available in the United States--dabigatran (Pradaxa®) and rivaroxaban …