A 60 year old man with rheumatic mitral stenosis with atrial fibrillation is on therapy for a fast ventricular rate. While on treatment, he developed a regular pulse of 64/min. The most likely drug being administered was:
A. Verapamil
B. Digoxin
C. Carvedilol
D. Propranolol

Correct answer : B. Digoxin

Slow ventricular rate in a patient with atrial fibrilliation indicates complete heart block – a complication of digoxin therapy.

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