Intermittent complete heart block or 2nd degree AV block, esp w/history of Stokes-Adams attacks. Arrhythmias caused by cardiac glycoside intoxication. Supraventricular arrhythmias associated with an accessory AV pathway, as Wolff- Parkinson White syndrome, unless the electrophysiological characteristics of the acces sory pathway & any possible deleterious effect of digoxin on these characteristics have been eval even without history of previous supraventricular arrtrythmias. Ventricular tachycardia, Ventricular fibrillation, Hypertrophic obstructive cardiomyopathy unless with concomitant atrial fibrillation & heart failure