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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