Which factor contributes to the superior long-term patency of arterial grafts like LIMA, RIMA, or radial compared to SVGs?

• A. Higher resistance to atherosclerosis, leading to better long-term patency.
• B. Higher flow.
• C. Lower flow.
• D. More prone to early failure.

Answer: (A)

The main idea is that arterial grafts inherently resist atherosclerotic changes much better than vein grafts. Because they are built to operate in the arterial system, LIMA, RIMA, and radial arteries maintain healthier endothelium and medial structure, which helps keep the lumen open over many years. Vein grafts, when placed in the arterial coronary circulation, are more prone to neointimal hyperplasia and progressive atherosclerosis, leading to narrowing and occlusion over time. That contrast in susceptibility to plaque and vessel-wall remodeling is what underpins the superior long-term patency of arterial grafts. While good flow is important, it’s the arterial grafts’ resistance to atherosclerosis that explains their durability, whereas higher or lower flow and early failure don’t capture that long-term advantage.