The aim of this study is to investigate the clinical outcomes of the elderly patients withNon ST-segment elevation myocardial infarction (NSTEMI) undergoing coronary arterybypass surgery (CABG) compared to non-elderly patients. Patients with NSTEMIand undergoing CABG (n=451) who were registered in the Korea Acute MyocardialInfarction Registry between December 2003 and August 2012 were divided into twogroups.; the non-elderly group (＜75 years, n=327) and the elderly group (≥75 years,n=124). In-hospital mortality was higher in the elderly group (4.9% vs. 11.3%, p=0.015),but cardiac death, myocardial infarction, and major adverse cardiovascular events(MACE) including cardiac death, myocardial infarction, percutaneous revascularization,and redo-CABG after a one-year follow up were not different between the twogroups. Predictors of in-hospital mortality in patients with NSTEMI undergoing CABGwere left ventricular (LV) dysfunction (ejection fraction ≤40%) [hazard ratio (HR):2.76, 95% confidence interval (CI): 1.16-6.57, p=0.022] and age (HR: 1.05, 95% CI:1.01-1.10, p=0.047). So elderly NSTEMI patients should be considered for CABG if appropriate,but careful consideration for surgery is required, especially if the patientshave severe LV systolic dysfunction.