Optimal Graft Selection for Coronary Artery Bypass Grafting
Primary Arterial Conduit Selection
- The American College of Cardiology recommends the left internal mammary artery (LIMA) as the gold standard conduit for the left anterior descending (LAD) artery, with superior long-term patency (>90% at 10-15 years) compared to saphenous vein grafts (25-50% at 10-15 years) 3, 4
- LIMA to LAD grafting is a Class I recommendation in all major cardiac surgery guidelines due to its proven survival benefit and reduced risk of recurrent ischemic events 1, 3
Secondary Arterial Conduit Options
- The American College of Cardiology recommends the radial artery as the preferred second conduit over saphenous vein grafts for the second most important non-LAD vessel (Class I, Level B-R recommendation) 1, 5
- Radial artery grafts demonstrate significantly better mid- and long-term patency rates (89% at 4-5 years) compared to saphenous vein grafts (65-80% at 4-5 years) 4, 5
Bilateral Internal Mammary Artery Consideration
- For a young patient, bilateral internal mammary artery (BIMA) grafting should be strongly considered if performed by an experienced surgeon (Class 2a, Level B-NR recommendation) 1, 6
- BIMA grafting has shown a survival advantage compared to CABG with a single IMA in observational studies 1
Technical Considerations
- For radial artery harvesting, palmar arch completeness and ulnar compensation should be objectively assessed before harvesting 1, 5
- The radial artery should be used to target vessels with significant stenosis (>70% for left-sided coronary arteries, >90% for right-sided arteries) 3, 5
Saphenous Vein Graft Considerations
- Saphenous vein grafts have declining patency over time (>90% at 1 year, 65-80% at 4-5 years, and only 25-50% at 10-15 years) 4, 3
- If saphenous veins must be used, endoscopic harvesting should be avoided as it has been associated with vein graft failure and adverse clinical outcomes 7, 6