Introduction:
Robert Goetz first performed and published the coronary artery bypass graft surgery in humans in 1961, now CABG has become an important revascularization methods of coronary heart disease[2]. Since the mid-1980s, owing to the high patency, the use of the left internal mammary artery (LIMA) for left anterior descending artery (LAD) grafting has been a cornerstone of CABG surgery[3]. However, owing to stenosis or occlusion of LIMA or harvested damage, surgeons have to choose other conduit materials to revascularize the LAD. The surgeons and fluid mechanics experts hold that the great saphenous vein has higher mean graft flow with less interference from external factors and is easier to anastomosis, due to its own vascular properties. A previous study demonstrated that studies on TTFM should consider conduit materials and different coronary territories, while few studies on the comparison of different conduit materials used for LAD in TTFM parameters have been reported[5]. The purpose of this study was to explore whether the great saphenous vein has more advantages in terms of TTFM parameters than the left internal mammary artery for the revascularization of left anterior descending arteries.