Safety and Effectiveness of No-touch Technique for Ascending Aorta in MICS-CABG

The goal of this single-center prospective cohort study is to compare perioperative safety metrics and follow-up survival analyses in patients receiving Minimally Invasive Cardiac Surgery Coronary Artery Bypass Grafting(MICS-CABG) and Off-Pump Coronary Artery Bypass(OPCAB). The main question it aims to answer is: Is the bridge vessel patency rate of patients in the MICS-Notouch group noninferior to that of a saphenous vein bridge with conventional open-chest bypass? Participants will be divided into two groups: Exposure group (MICS-Notouch group): non-extracorporeal circulation multiple coronary artery bypass grafting surgery performed under direct visualization of a small incision in the left chest, including the application of LIMA (left internal mammary artery) + SVG (saphenous vein) multiple bypass grafting. Control group (OPCAB group): conventional median chest opening, non-extracorporeal circulation multi-branch coronary artery bypass graft surgery.