After surgery for all types of precardiac disease, the child is in a critical state. The function of all organs is low and incomplete, and functional failure will occur if the disease progresses (especially in newborns and infants with critical and complex precardiac disease). Infections, coagulation disorders, pericardial tamponade, hypocapnia, arrhythmias, heart failure, circulatory failure, respiratory failure, renal failure, hepatic failure, neurological disorders, stress ulcers, gastrointestinal bleeding, gastric and intestinal dysfunction, celiac disease, etc., all of which require close monitoring and timely management, are possible. The cardiac intensive care unit is equipped with advanced monitoring and treatment equipment, and is a medical team composed of experienced and professional medical and nursing staff, which provides 24-hour dynamic and uninterrupted monitoring and living care for the children, and can provide timely treatment for changes in the children’s condition, which plays a key role in the treatment of the children. Post-operative children with minor illnesses can generally be discharged from the care unit in 1-3 days; children with severe illnesses can be transferred only after their vital signs stabilize, and they need to be re-admitted to intensive care once their conditions change.