VT (symptomatic or sustained VT [duration longer than 30 seconds or 100 beats, or associated with hemodynamic collapse]) VF symptomatic bradycardia, pauses of longer than 3.0 seconds, complete atrioventricular block, Mobitz II atrioventricular block Symptomatic heart failure (NYHA criteria + physical examination OR hospitalization due to heart failure) Renal failure Stroke Death