The Impact of Preoperative Quantitative Flow Reserve (QFR) on Early Postoperative Radial Artery Graft Outcomes in Coronary Artery Bypass Grafting

Inclusion Criteria: * Patients aged 18 to 80 years. * Patients whose angina pectoris significantly affects daily life and work, and for whom conservative medical treatment is ineffective, requiring coronary artery bypass grafting (CABG). * Preoperative coronary angiography data are available for quantitative flow ratio (QFR) analysis. * Patients with severe stenosis, defined as greater than 70% stenosis, in the three main coronary artery branches, including the left anterior descending artery, circumflex artery, and right coronary artery, with or without left main coronary artery stenosis greater than 50%. Exclusion Criteria: * Patients who cannot tolerate CABG due to comorbidities or complications. * Patients requiring urgent CABG or percutaneous coronary intervention (PCI). * Patients with significant congestive heart failure or hemodynamic instability. * Patients with a history of previous CABG or PCI within the past 6 months. * Patients who have experienced a stroke within the past 6 months. * Patients requiring concurrent cardiac procedures, such as valve surgery, maze surgery, radiofrequency ablation, or pacemaker implantation. * Patients with allergies to contrast agents or antiplatelet medications, or with contraindications to antiplatelet medications due to bleeding risks. * Patients with a significant history of bleeding, marked leukopenia, neutropenia, thrombocytopenia, anemia, or bleeding diathesis. * Patients currently participating in other prospective clinical studies. * Patients who are unwilling to participate in this study.