Coronary artery disease can also be present when the EKG and all three cardiac tests are normal. An ECG will only reflect an abnormal heart problem when it is done during an angina attack, or when there is a myocardial infarction, etc. in a patient with coronary artery disease. When the patient does not have angina pectoris or myocardial infarction when the ECG is done, the ECG may appear normal, and therefore a patient with a normal ECG may also have coronary artery disease. Myocardial triple test refers to troponin, myoglobin, and creatine kinase isoenzymes, which are mainly used to determine the time and severity of myocardial injury. When a patient with coronary heart disease does not have a myocardial infarction caused by vascular occlusion, the myocardial triple test is also normal, so it can not be ruled out that the patient has coronary heart disease. If there is any discomfort, consult a doctor in time and follow the doctor’s instructions.