Fig. 1

Flow chart of patients. All CABG operated patients in Sweden between 2005 and 2015, aged 40 to 80 years old, without congenital malformations, were included in the study data base. We excluded redo operations, cases where no IMA was used or where graft information was missing, cases where single IMA was the only graft used, cases where arterial grafts other than the single IMA were used and cases where an endarterectomy or plasty was performed. CABG indicates coronary artery bypass grafting; IMA internal mammary artery; SVG saphenous vein graft