What is digoxin's role before a cardioversion?

Control Heart Rate: Digoxin is used, especially in cases of atrial fibrillation to control the heart rate, usually in conjunction with anticoagulation to thin the blood. Cardioversion might then be performed once improved heart rate control had been acheieved with the medications, or because the medications were not sucessful.

Cardio version: Before cardio version we generally try to slow a rapid supra ventricular rhythm. Digoxin is one of the drugs we may choose to do this. It helps slow the rate by slowing conduction of impulses in the heart. We use other drugs also, so it's doctors choice which agent the believe is best for the situation.