Aim of the study:To compare primary success and effectiveness of percutaneous coronary intervention (PCI) in diabetics and nondiabetics with the history of artery bypass grafting (CABG) in mid-term follow-up.In diabetics undergoing PCI because of the recurrence of AP after CABG,there was a trend to lower ejection fraction of the left ventricle,older age of the patients,higher incidence of arter. hypertension and to earlier PCI in comparison to nondiabetics.Before PCI diabetics were more symptomatic than nondiabetics.After PCI the severity of AP was reduced significantly in both groups.Primary success of PCI and the occurrence of complications were comparable between the groups.Complete revascularization was less often achieved in the diabetic group.During a two years follow-up,recoronarography and reinterventions were more frequent in diabetics.A trend to a higher incidence of clinical restenosis was seen in diabetics.The incidence of clinical events during follow-up was comparable between the groups.