Recurrent Syncope Is Being Evaluated in a 66-Year-Old Man

Recurrent syncope is being evaluated in a 66-year-old man. Over the last 6 months, he has experienced three episodes of dizziness and palpitations, followed by a brief loss of consciousness. He is not experiencing any chest pain or dyspnea. The patient has a history of high blood pressure and hyperlipidemia. There is no history of sudden death in the family. The initial evaluation reveals that the ECG and echocardiogram are normal. An electrophysiologic study of the heart is performed. During the study, an intravenous infusion of a medication is given, resulting in the responses shown below. Which of the following medications was most likely administered to this patient?

A) Acetylcholine
B) Adenosine
C) Clonidine
D) Esmolol
E) Isoproterenol
F) Norepinephrine
G) Phenylephrine

Correct Answer:

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