Conclusions
The luminal diameter and flow of vascular grafts of the CABG patients who underwent in situ left IMA bypass increased after the operation, and the flow of vascular grafts at 1 week postoperatively was significantly greater than the intraoperative level. The angle between IMA-subclavian artery affected the postoperative flow of vascular graft. Therefore, related parameters of left proximal IMA in the postoperative follow-up could be used to assess the patency of vascular grafts in the patients.