Coronary artery disease is a serious cardiovascular disease. As with any disease, early diagnosis is always important and it is also easy to take precautions. In heart failure due to coronary artery disease, the diagnosis is first made and then the treatment is planned according to the patient's condition and history. Routine tests such as ECG (electrocardiogram), echocardiogram, stress test, cardiac catheterization and angiogram, heart scan can be used for diagnosis. In the light of these tests, simple but effective treatment methods such as medication and life standard improvement suggestions are shared with the patient. Apart from these, operational interventions can also be carried out. These are angioplasty and stent placement and coronary bypass surgery.