Coronary artery disease (CAD) or ischaemic heart disease caused by atherosclerosis is the most common form of cardiovascular disease. CAD leads to acute coronary syndrome which is the clinical syndrome caused by new or growing interruption or occlusion of blood supply to a part of the heart, causing heart cells to die and myocardial infarction. Myocardial infarction destroys normal myocardium and leads directly to heart failure. This paper describes the case of male patient who in the age of 56 suffered from huge myocardial infarction, which caused important heart contractility disturbances, essential reduction in ejection fraction and provoked symptomatic heart failure. Despite fast revascularization and optimal pharmacotherapy patient remained in class III NYHA classification. As the next step in therapeutic procedure patient underwent the implantation of cardioverter-defibrillator with cardiac resynchronization. After 2 years from this procedure big clinical progress was observed. Now patient remains in class I NYHA classification. Also improvement of left ventricle function in echocardiography was observed. Correct qualification to applied treatment determined its safety and legitimacy, and resulted in good clinical effect of treatment the patient with heart failure. Such effectiveness is very important for the patient’s follow-up and good prognosis due to cardiovascular risk reduction.