Atherosclerosis a type of arteries’ hardening that is caused by the formation of atheromatous plaque in the vessel wall. CABG is proposed as a standard of care for patients with coronary artery disease. This method besides its advantages has a variety of side effects that in addition to physiological mortality and morbidity suffers from psychological effects that are reviewed in this paper. The surgery is associated with multiple psychiatric symptoms for patients. Among them the pre and post-surgical mental problems and disorders are more important. Also As mentioned before depression is commonly reported as a consequence of coronary artery bypass surgery and it is associated with a great risk of mortality, morbidity, increased medical care and reduced performance in daily activities. Quality of life means the ability to perform daily affairs satisfactorily that includes a wide range of features and physical and mental factors. Scientific evidence suggests that 32% of heart patients in hospitals have severe depression that is continued after a year. However, it has been more than 40 years that delirium has been reported as an adverse postoperative cardiac surgery event. The analysis of the relief and relaxation method used by the nurses and its relationship with the incidence of post-surgical delirium helps to identify the areas that require training and practical changes.