Review Question - QID 213388

A 33-year-old man presents to the emergency department with anxiety and palpitations. This is the first time that he has presented to the emergency for this, but he has had similar episodes before which he says went away by performing calming exercises such as blowing air through pursed lips. This time they are not working. The patient’s past medical history is non-contributory, and he is generally healthy. His temperature is 98.3°F (36.8°C), blood pressure is 127/85 mmHg, pulse is 190/min, respirations are 14/min, and oxygen saturation is 99% on room air. An ECG is performed as seen in Figure A. The patient is given adenosine and a repeat ECG is seen in Figure B. Which of the following is the best definitive management for this patient at this point in his workup?