Valve replacement usually passes the danger period in about 2-3 days, and some patients can pass the danger period in about 3-5 days. After heart valve replacement surgery, it may cause a series of complications, such as postoperative bleeding, incision infection, respiratory tract infection, renal insufficiency, coma, stroke, etc. Usually, it takes about 2-3 days to pass the danger period. If the heart function is poor before the valve replacement surgery, or there are cardiac arrhythmias, severe pulmonary hypertension, etc., it may take about 3-5 days to pass the danger period. In case of heart valve replacement surgery, it is recommended to choose a regular large hospital as well as an experienced surgeon to improve the success rate of the surgery and reduce the risk of postoperative complications. After the operation, we should also pay close attention to the patient’s vital signs and strictly follow the doctor’s instructions to ensure that the patient passes through the danger period safely after the operation. If any abnormality is found, feedback should be given to the surgeon as soon as possible so that emergency treatment measures can be taken in time.