Determinants for successful sequential radial artery grafting to the left circumflex and right coronary arteries

Area of Science:

• Cardiovascular Surgery
• Vascular Grafting
• Coronary Artery Disease

Background:

• Radial artery grafts (RAGs) are increasingly used in coronary artery bypass grafting.
• Sequential grafting techniques, particularly composite I- or Y-grafts, are employed for multiple target vessels.
• Understanding factors influencing graft patency and antegrade flow is crucial for long-term outcomes.

Purpose of the Study:

• To identify determinants of antegrade flow and long-term patency for sequential RAGs in the left circumflex artery (LCX) and right coronary artery (RCA).
• To evaluate the impact of native coronary artery stenosis severity on graft performance.

Main Methods:

• Retrospective observational study of 432 sequential RAGs.
• Analysis of angiograms to assess graft patency and antegrade flow to target coronary arteries.
• Statistical analysis (univariate and multivariate) to identify predictors of competitive flow and occlusion.

Main Results:

• Overall graft patency was high (95.6%), with 76.6% providing antegrade flow to all targets.
• Moderate stenosis (51-75%) in the most distal target artery was a significant predictor of competitive flow or occlusion (OR=8.59).
• Graft patency at 40 months was significantly lower for grafts targeting arteries with 51-75% stenosis (59.1%) compared to 76-100% stenosis (88.6%).

Conclusions:

• The severity of stenosis in the most distal target vessel significantly impacts the prevention of competitive flow and long-term patency of sequential RAGs.
• Targeting coronary arteries with severe stenosis (76-100%) is associated with better long-term graft patency.
• Careful selection of distal targets is essential for optimizing outcomes in sequential RAG procedures.