Review Question - QID 216999

A 65-year-old man presents to the emergency department with palpitations. He has experienced these before but notes that they have not gone away this time. The patient has a past medical history of diabetes and a myocardial infarction 3 years ago. He is not currently taking any medications and has been trying to manage his conditions with lifestyle measures. His temperature is 98°F (36.7°C), blood pressure is 167/98 mmHg, pulse is 133/min, and respirations are 16/min. Physical exam reveals an obese man in no acute distress. He is well perfused and walks with a steady gait. An ECG is performed as seen in Figure A. Laboratory studies are ordered and are currently pending. Which of the following is the most appropriate next step in management?