A normal dynamic electrocardiogram cannot rule out coronary heart disease. Dynamic electrocardiogram is the earliest and most commonly used diagnostic method in the diagnosis of coronary artery disease, but a normal dynamic electrocardiogram cannot completely exclude heart disease. Many patients with coronary artery disease have a decrease in the maximum reserve capacity of the coronary arteries, but the blood flow is still normal at rest, so the dynamic electrocardiogram can be completely normal. The diagnosis of coronary artery disease is mainly based on coronary CT or coronary angiography to determine whether there is a narrowing of the heart vessels and whether there is a cardiovascular blockage. It is recommended to go to the hospital in time if there are suspected symptoms of coronary heart disease and cooperate with the doctor to do coronary CT or coronary angiography to avoid delaying the condition.