A 65-year-old
man with a past medical history of hyperlipidemia, migraines, and
osteoarthritis presents to the hospital with new-onset atrial
fibrillation. His heart rate generally runs low between 40/min and
50/min. In an attempt to cardiovert the patient, a transesophageal
echocardiogram is performed without signs of thrombus, and electric
cardioversion is attempted with 300 Joules. The patient's atrial
fibrillation is persistent, and he fails electric cardioversion. The
patient is advised about the long term effects of atrial fibrillation
and is interested in attempting antiarrhythmic therapy. Treatment with
dofetilide is being considered. Which of the following complications is
most likely to occur in this patient with treatment?
A. Ventricular arrhythmia
B. Worsening bradycardia
C. Tachycardia
D. Right axis deviation
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