This is a singlecenter, retrospective cohort study. The Institutional Review Board (IRB) of Seoul National University Bundang Hospital approved this study with the registration number B-1808/487-104. The requirement for informed consent was waived due to the retrospective nature of this study. All data of CABG surgery between May 2005 and December 2016 in our electronic medical record were collected. All patients who underwent primary CABG with our typical configuration were included. We excluded those without or with inadequate preoperative coronary angiography, as well as those who did not have postoperative coronary computed tomography (CCT) or coronary angiography at 6 to 12 months. Patients with I-graft configuration of bilateral IMA and anastomosis to the distal portion of the right coronary artery (before giving its branches) were also excluded. Patient selection can be seen in Figure Figure22.

Diagram showing how patients were selected. CABG = coronary artery bypass graft, CCT = coronary computed tomography, IMA = internal mammary artery, LAD = left anterior descending artery, and RCA = right coronary artery.

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