50 year old male presents to clinic as an ER follow-up from an episode of lone atrial fibrillation with no history of hypertension, diabetes mellitus, heart failure, transient ischemic attack, or stroke.
What agent should be used to prevent stroke in this patient?
Gage BF, Waterman AD, Shannon W, et al: Validation of clinical classification schemes for predicting stroke. JAMA 2001;285(22):2864-2870.
Gage BF, van Walraven C, Pearce L, et al: Selecting patients with atrial fibrillation for anticoagulation: Stroke risk stratification in patients taking aspirin. Circulation 2004;110(16):2287-2292