Complications after heart valve surgery can include low cardiac output syndrome, arrhythmia, postoperative infection, and perivalvular leakage. 1. Low cardiac output syndrome: it is more common, the main reason is that irreversible damage to the heart is caused to a certain extent during the operation, and there is a decrease in cardiac output after the operation, which decreases to less than 3 liters/minute, called low cardiac output syndrome. 2. Arrhythmia: it mainly occurs in patients with high age and risk of cardiovascular and cerebrovascular diseases. If arrhythmia occurs, it is usually malignant and not easy to be corrected by medication, so it is necessary to assess the patient’s condition and the risk of surgery before operation. 3. Postoperative infection: prosthetic valves, due to its rejection, due to the different constitution of the individual, there is a certain possibility of postoperative rejection and infection, such as anti-rejection drugs and anti-infection treatment is ineffective, the need for a second operation. 4. Perivalvular leakage: mainly due to the prosthetic valve due to calcification of the leaflets and annulus, generally perivalvular leakage occurs with weak leaflets and calcification of the leaflets and annulus. After the occurrence of symptoms such as dyspnea, inability to lie down, edema, etc., usually requires a second surgery to repair. If a patient develops complications after heart valve surgery, he or she should seek prompt medical attention.