A 77 year-old female comes to her gastroenterologist office for an elective colonoscopy procedure. Her medical history is significant for congestive heart failure and hypertension. After the procedure, she reports shortness of breath and palpitations. An ECG is taken, which reveals atrial fibrillation. Emergent cardioversion failed to relieve her symptoms. An extra dose of metoprolol 25 mg improved her shortness of breath and palpitations. She is breathing comfortably on room air with oxygen saturation by pulse oximetry 97%. Blood pressure is 145/94 mm Hg. Heart rate is 112 beats/min at rest. At the time of discharge, she informs you that she is averse to frequent blood tests and prefers to ‘stay at home’. Which of the following medications is indicated for long-term anticoagulation in this patient?
