A 68-year-old man with hypertension and diabetes mellitus presents with palpitations and dyspnea for 2 days. On examination, pulse is irregularly irregular at 110 bpm, BP 145/92 mmHg. ECG shows absent P waves, irregular RR intervals, and a ventricular rate of 115 bpm. Troponin I is normal. Echocardiography shows normal LV function and no structural heart disease. Which of the following is the most appropriate initial management?

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