Graft occlusion remains a common complication of CABG, with venous grafts showing higher failure rates compared to arterial grafts. CTCA is an effective modality for assessing graft patency and native artery status, offering a non-invasive alternative to traditional methods. Factors such as competitive flow from native arteries and graft type significantly influence patency, underscoring the need for individualized approaches to graft selection and placement. Further research is warranted to explore these factors and improve long-term outcomes for CABG patients.