Sinus rhythm st alterations, in the case of myocardial ischemia and myocardial hypertrophy, cannot be normalized. If it is a simple ECG abnormality performance, usually can be restored. 1. Myocardial ischemia: it is related to insufficient blood supply to the coronary arteries or a complication caused by coronary atherosclerosis. The sinus rhythm st change that occurs in this disease is generally unable to return to normal, mainly related to the reduction of oxygen supply to the heart, myocardial energy metabolism abnormalities, these abnormalities are generally irreversible, so the sinus rhythm st change can not be restored. 2. Myocardial hypertrophy: related to hypertension, hypertrophic cardiomyopathy, these two diseases caused by sinus rhythm st changes can not return to normal, mainly due to the reduction of ventricular compliance, resulting in ventricular diastolic restriction, so can not be restored. 3. Simple ECG abnormality: it is a normal performance, no underlying lesions, heart function has not been damaged, away from the causative factors after the sinus rhythm can be restored on its own, without special treatment, but should be regularly rechecked electrocardiogram. If sinus rhythm changes are caused by the above factors, it is recommended to consult a doctor in time and analyze the cause through coronary angiography, electrocardiography and cardiac ultrasound before treating the symptoms.