Left internal mammary artery (LIMA) grafts have an 85% patency rate at 10 years. This is compared to about 50% for saphenous vein grafts in the same time period.

Long-term patency of saphenous vein and left internal mammary artery grafts after coronary artery bypass surgery. J Am Coll Cardiol. 2004;44(11):2149-2156.