A 66-Year-Old Man Is Evaluated for Recurrent Syncope

A 66-year-old man is evaluated for recurrent syncope.  He has had 3 episodes of dizziness and palpitations followed by brief loss of consciousness over the last 6 months.  He has no chest pain or dyspnea.  The patient has a history of hypertension and hyperlipidemia.  There is no family history of sudden death.  Initial evaluation shows normal ECG and echocardiogram.  A cardiac electrophysiologic study is performed.  During the study, intravenous infusion of a medication is administered and produces 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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