These have included premature ventricular depolarizations (50%), AV nodal arrhythmias (50%), AV conduction disturbances (36%), wide complex tachycardia (less than 1%), paroxysmal atrial tachycardia with AV block , complete heart block , PR prolongation, and ST segment changes. Digoxin is contraindicated in patients with ventricular fibrillation. Digoxin should generally be avoided in