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Aim Reduced Left Ventricular Ejection Fraction (LVEF) is a risk factor for patients undergoing Coronary Artery Bypass Grafting (CABG). The aim of our study was to compare short term outcomes and long-term (20 years) survival rates of patients with reduced LVEF undergoing CABG. Method Between 1996 and 2015, 5016 patients with reduced LVEF underwent CABG: 1024 (20.4%) had poor LVEF (&amp;lt; 30%) and 3992 (79.6%) had moderate LVEF dysfunction (30-49%). After excluding reoperations and combined procedures, the final sample consisted of 3867 patients. Our primary outcomes were early in-hospital mortality and complications and long-term survivals. Results In-hospital mortality rate was 4.4%, stroke rate 1.4% and renal failure 2.9%. Survival rates at 1, 5, 10 and 20 years were 91.1%, 76.7%, 55.1% and 22.1% respectively. Additive Euroscore and Logistic Euroscore (AUC 0.78) is less reliable compared to normal LV patients. Complete revascularization was an independent factor affecting long term survival (HR: 0.85). No difference between OPCABG and ONCABG were found. Conclusions CABG is still safe and most likely the best treatment option for patients with reduced LVEF. Completeness of revascularization plays an important role in long term outcomes while OPCABG has no significant advantages. Euroscore has a reduced predicting ability in this group of patients.

624 Twenty Years' Experience of Coronary Artery Bypass Grafting in Patients with Reduced Left Ventricular Ejection Fraction