First of all, it should be noted that any surgery has risks. Cardiac surgery is one of the more difficult surgical procedures because it requires extracorporeal circulation support and cardiac arrest during surgery. Therefore, the risk of surgery is also higher than that of other specialties. However, with the improvement of the overall academic and technical level of cardiac surgery. In hospitals where cardiac surgery is routinely performed, this surgery becomes routine and the surgical risk is relatively low to control. Nevertheless, surgical treatment of precardiac disease is still subject to complications such as anesthesia accidents, extracorporeal circulation accidents (including air embolism, thrombosis, cardiac arrest, etc.), drug allergy, disorders of coagulation mechanisms, pericardial tamponade, internal environmental disorders such as water, electrolytes and metabolism that are difficult to correct, hoarseness, choking, celiac disease, residual shunts, regurgitation of each valve, various severe arrhythmias, and atrioventricular block. The chances of these surgical complications are small, but whenever they are possible, the surgeon will confide in the child’s parents preoperatively.