The intensive care unit is also known as intensive intensive care unit, ICU, and critical care medicine unit. It is a medical unit for intensive care of acute and critically ill patients, and its purpose is to manage and admit critically ill patients in a centralized manner with the aim of achieving good treatment results. The intensive care unit is equipped with a comprehensive vital sign monitoring system and vital sign support and treatment system, which allows for round-the-clock monitoring of patients’ conditions and active management of unexpected conditions. The staff is often a team of medical and nursing staff with certain experience in resuscitation as a guarantee of treatment, and can conduct multidisciplinary joint consultations at any time according to the patient’s condition to provide the most optimal treatment plan for the patient. In addition, according to the different patients it treats, it can be divided into comprehensive ICU and specialized ICU, such as burn ICU, neonatal ICU, CCU, etc. Patients admitted in ICU are often critical, variable and complex, so the treatment cost is relatively high, but as a newly developed discipline in recent years, it has an irreplaceable role in the rescue and treatment of critical patients.