The heart rate of a patient with coronary artery disease will be at a normal level of 60-100 beats per minute. For mild coronary artery disease or coronary artery disease with comorbidities, but through drugs or other treatment programs, the patient’s heart rate or the patient’s clinical symptoms are relatively well controlled; or for previous serious coronary artery disease, such as acute coronary syndromes, but the patient through the PCA and other treatments and means of control is more satisfactory, the patient does not have serious arrhythmia, usually heart rate will be within the normal range. If a patient with coronary artery disease develops serious arrhythmia, such as obvious tachycardia or bradycardia, accompanied by palpitations, chest tightness, shortness of breath, precordial pain and other symptoms, it is important to consider that coronary artery disease is aggravated, for example, the emergence of acute coronary syndromes and other conditions.