CABG to improve survival is beneficial in patients with significant (>70% diameter) stenoses in 3 major coronary arteries (with or without involve- ment of the proximal left anterior descending [LAD] artery) or in the proximal LAD plus 1 other major coronary artery.26,30,53 56 (Level of Evidence: B) 2. CABG or PCI to improve survival is beneficial in survivors of sudden cardiac death with presumed ischemia-mediated ventricular tachycardia caused by significant (>70% diameter) stenosis in a major coronary artery. (CABG Level of Evidence: B57 59; PCI Level of Evidence: C57) Class IIa 1. CABG to improve survival is reasonable in patients with significant (>70% diameter) stenoses in 2 major coronary arteries with severe or extensive Table 3. 