A 56-Year-Old Man Comes to the Office Due to Progressively

A 56-year-old man comes to the office due to progressively worsening fatigue, difficulty concentrating, and increasing forgetfulness over the past several weeks.  In addition, the patient has had vague abdominal pain and constipation and has gained 2.7 kg (6 lb) unintentionally over the last 3 months.  Medical history is significant for hypertension, nonischemic cardiomyopathy with left ventricular systolic dysfunction, and atrial fibrillation.  Blood pressure is 140/90 mm Hg and pulse is 75/min.  Physical examination reveals regular heart sounds with normal S1 and S2.  The lungs are clear to auscultation.  There is no lower extremity edema, and the skin appears dry.  Laboratory studies are as follows: Which of the following medications is most likely responsible for this patient's current symptoms?

A) Amiodarone
B) Digoxin
C) Dofetilide
D) Hydralazine
E) Metoprolol
F) Verapamil

Correct Answer:

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