This review article summarizes the major studies performed to show the clinical outcomes of coronary artery bypass graft surgery (CABG), including the history of CABG, indications, measurement of quality of life after CABG in addition to complications to surgery such as life prolongation, physical functioning which can be tested through relief of angina and dyspnea and improvement of physical activity.. We are also going to discuss the mortality and morbidity outcomes following CABG. We should know that, the literature demonstrates that the outcomes of CABG have been measured in terms of mortality and morbidity; however, it has now been well recognized that adjustment to CABG is a multidimensional phenomenon that is not fully explained by medical factors. Therefore, in addition to studying mortality and morbidity outcomes following CABG, many recent studies have identified that it is important to investigate various physical, psychological, and social variables that have a significant impact on post-operative adjustment to CABG. Coronary artery bypass graft surgery is increasingly common in patients of age ≥80 years. We are going to discuss the use and outcomes of bypass surgery in the very elderly.