With the development of medicine, the intensive care unit (ICU) has become an indispensable part of modern hospitals. Especially in cardiovascular department, it is directly related to the safety and recovery of surgical patients, and is one of the key links to improve the success rate of surgical operations. After heart surgery, patients’ heart, lung, kidney and brain functions are in an unstable state. Through monitoring, abnormal changes are detected in time and corrected immediately by applying advanced medical technology and equipment, so that various abnormal indicators can be quickly restored to normal range and the functions of each organ of the patient can be guaranteed to be in a stable state and the patient can pass the dangerous stage. Therefore, patients after cardiac surgery are admitted to the care unit for intensive care. In order to give you a more comprehensive understanding of the care unit, the following is an introduction to the general situation of the care unit. (1) Purpose and requirements of establishing a care unit: The purpose of establishing a care unit is to concentrate the efforts of technical staff and apply modern and sophisticated monitoring medical equipment to provide the best postoperative care to patients. The monitoring room is equipped with specially trained high-level professional physicians and nurses, and the monitoring room is overlapped with a 24-hour duty system, with medical and nursing staff guarding the patient around the clock, monitoring the patient’s vital signs at any time, and organizing rapid resuscitation when the patient has an accident. (2) requirements for entering the monitoring room: patients entering the monitoring room are post-operative cardiac surgery and critically ill, due to the relative concentration of patients, the chance of cross-infection is high, so all personnel entering the monitoring room must wear overalls and change shoes, the patient’s family members refused to enter the room to visit or escort. (3) Patient requirements after the monitoring room: patients into the monitoring room, medical and nursing staff to carry out continuous monitoring of their vital signs, the main means of monitoring is a variety of functional monitors. As soon as the patient enters the monitoring room after surgery, the medical staff should quickly connect the ventilator, cardiac monitoring line, arterial pressure measurement, central venous pressure tube, urinary catheter, gastric tube, and infusion pump. These leads and tubes are important pipes for monitoring and maintaining life, and patients should cooperate closely and not pull them out by themselves to avoid accidents that could endanger the patient’s life. In order to help the patient safely pass through the intubation stage, medical staff usually use restraints to fix the patient’s hands or feet at the bedside to prevent the patient from pulling out the tubes on his own when he is not awake, and generally after the condition stabilizes 1-3 days after surgery, various tubes can be pulled out one after another.