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AIM: The aim of this study was to investigate whether the completeness of revascularization affects the outcomes in the octogenarian. MATERIAL OF STUDY: We retrospectively reviewed 130 consecutive octogenarians who underwent isolated coronary artery bypass grafting (CABG) between January 2003 and September 2010. According to operative technique, patients were categorized in Complete Revascularization (CRV) Group (96 patients) and in Incomplete Revascularization (IRV) Group (34 patients). Follow-up was 98% complete (mean: 30 ± 25 months). RESULTS: The overall in-hospital mortality was 13% and was similar in both groups (p=0.0553). Multivariate regression analysis identified preoperative left ventricular ejection fraction ≤ 40% (p= 0.0060; OR= 0.19) and NHYA class > II (p= 0.0042; OR= 0.17) as risk factor for in-hospital death. Cox regression analysis not identified incomplete revascularization as risk factor for early or late death (p= 0.1381 and p= 0.8865). No differences in 5-year survival and freedom from major adverse cardiac and cerebrovascular events (MACCE) was found between two groups (p=0.8865 and p=0.6283). DISCUSSION: CRV is important in young patients undergoing CABG, but this principle remains less absolute in elderly patients. In our study, the survival benefit of CRV was less in octogenarians. Probably, the major benefit of CRV was seen in patients less than 80 years of age. This makes sense because these patients have a longer expected survival, and there were more patients available to statistically confirm any difference in outcome. CONCLUSIONS: In octogenarians undergoing CABG, IRV does not affect survival and freedom from MACCE. Patients’ preoperative conditions are important in determining short and long term outcomes.