The heart rate of myocardial ischemia is not fixed, and needs to be analyzed according to the severity of myocardial ischemia of the patient, for example, the mild one is generally between 60~100 times per minute; when severe myocardial ischemia is present, the heart rate may be increased or slowed down, and there will be a possibility that it may be below 60 times per minute or above 100 times per minute. 1. Mild myocardial ischemia: myocardial ischemia is mainly due to the narrowing of coronary arteries, myocardial blood supply and oxygen supply is insufficient and caused by a pathological state, if it is mild myocardial ischemia, the normal range of heart rate is generally between 60 and 100 beats per minute, the patient will usually have arrhythmia, can cause chest tightness, shortness of breath and other symptoms. 2. Severe myocardial ischemia: If severe myocardial ischemia affects the sinoatrial node and atrioventricular conduction system, most patients will experience increased heart rate, which may exceed 100 beats per minute. Symptoms such as dyspnea and precordial pain may also be triggered, and the heart rate will drop significantly, approximately below 60 beats per minute. Patients with myocardial ischemia should go to the hospital for further examination to clarify the cause of the disease and take targeted treatment as prescribed by the doctor.