Asymptomatic
Class I
- CABG should be performed in patients with asymptomatic ischaemia or mild angina who have significant left main coronary artery stenosis.
- CABG should be performed in patients with asymptomatic ischaemia or mild angina who have left main equivalent: significant (greater than or equal to 70%) stenosis of the proximal LAD and proximal left circumflex artery.
- CABG is useful in patients with asymptomatic ischemia or mild angina who have 3-vessel disease. (Survival benefit is greater in patients with abnormal LV function; e.g., ejection fraction [EF] less than 0.50 and/or large areas of demonstrable myocardial ischaemia.)
Class IIa
- CABG can be beneficial for patients with asymptomatic or mild angina who have proximal LAD stenosis with 1- or 2-vessel disease. (This recommendation becomes Class I if extensive ischaemia is documented by a noninvasive study and/or LVEF is less than 0.50.)
Class IIb
- CABG may be considered for patients with asymptomatic or mild angina who have 1- or 2-vessel disease not involving the proximal LAD. (If a large area of viable myocardium and high-risk criteria are met on noninvasive testing, this recommendation becomes a Class I.)