Review Question - QID 214595

A 33-year-old man presents to the emergency department with anxiety, palpitations, and weakness. His symptoms started while he was at a dental appointment for a procedure. He has never had these symptoms before and is generally healthy. His temperature is 97.7°F (36.5°C), blood pressure is 144/88 mmHg, pulse is 85/min, respirations are 19/min, and oxygen saturation is 98% on room air. Physical exam reveals a fatigued appearing man with perioral cyanosis and a rapid and regular heart rate. Initial laboratory studies are pending. Which of the following is the most appropriate treatment for this patient?