Reference no: EM133758995

Question

A 22-year-old man comes to the clinic to evaluate intermittent palpitations and lightheadedness since last night. He has not had any syncopal episodes, chest pain, nausea, or vomiting. His past medical history includes cluster headaches and GERD. His current medications include triptans PRN and ranitidine PRN. He drinks 4-5 beers and 4 cups of coffee daily. He does not smoke or use recreational drugs. His paternal uncle died at age 35 due to a cardiac condition. His temperature is 37.0°C (98.6°F), pulse is 175/min, respirations are 23/min, blood pressure is 120/85 mmHg, and SpO2 of 96%. Heart sounds are regular. He appears alert and oriented. Lead II telemetry is shown below. He is administered a medication that blocks calcium influx and promotes potassium expulsion from pacemaker cells resulting in hyperpolarization and prolongation of the AV node refractory period. Which of the following is the most likely therapeutic agent administered to this patient? Reproduced from Wikipedia Elimination tool Adenosine Verapamil Amiodarone Propranolol Ivabradine.