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Influence of graft-host diameter ratio on the hemodynamics of CABG
1Beijing University of Technology, Chaoyang, Beijing 100022, PR China. qak@bjut.edu.cn
Insights
Larger or equally sized grafts in coronary artery bypass grafting (CABG) improve blood flow dynamics and reduce stress on artery walls. Alternative surgical connections are still needed to enhance long-term graft patency.
Area of Science:
- Biomedical Engineering
- Cardiovascular Surgery
- Fluid Dynamics
Background:
- Coronary artery bypass grafting (CABG) is a common surgical procedure.
- The success of CABG depends on graft performance and patency.
- Graft-host diameter ratio is a critical factor influencing graft hemodynamics.
Purpose of the Study:
- To investigate the impact of graft-host diameter ratios on blood flow patterns.
- To analyze wall shear stress (WSS) and related parameters in coronary artery bypass grafts.
- To determine optimal graft sizing for improved CABG outcomes.
Main Methods:
- Simulated pulsatile blood flow in three CABG models using finite element analysis.
- Varied graft diameters relative to the host coronary artery (larger, equal, smaller).
- Evaluated flow patterns, WSS, WSS gradients (WSSG), oscillating shear index, and shear stress ratio.
Main Results:
- Models with larger or isodiametric grafts exhibited improved hemodynamics.
- These models showed larger positive longitudinal velocity, uniform and higher WSS, and smaller WSSG.
- No significant differences in temporal WSS parameters were observed across the models.
Conclusions:
- Larger or isodiametric grafts appear favorable for coronary artery bypass graft hemodynamics.
- Current graft sizing strategies may not fully optimize flow conditions.
- Novel anastomotic designs are essential for improving CABG patency rates.
Abstract:
The graft-host diameter ratios have impacts on the flow patterns of bypass graft. In order to clarify the influence of graft-host diameter ratios on the flow patterns and the wall shear stress in coronary artery bypass graft (CABG), the pulsatile blood flows in three CABG models, with the graft diameter larger than, equal to and smaller than that of the coronary artery, were simulated with finite element method. The temporal-spatial distributions of flow patterns, wall shear stresses (WSS), wall shear stress gradients (WSSG), oscillating shear index and shear stress ratio were depicted and compared. Of the three models evaluated, large model can bring about better hemodynamics to some extent with relatively large positive longitudinal velocity, uniform and large WSS, and small WSSG. The results suggest that larger or isodiametric graft is favorable. However, no distinct difference of WSS based temporal parameters was found between all the three models. Alternative anastomotic designs are necessary for the improvement of CABG patency rates.
