The scope of admission to the intensive care unit (ICU) mainly includes the following: 1, patients with cardiac and respiratory arrest after successful resuscitation; 2, patients with certain respiratory diseases, such as severe pneumonia, acute respiratory failure, acute respiratory distress syndrome, and acute attacks of chronic respiratory failure; 3, patients without clear indications for surgery, such as shock, severe trauma, and multiple injuries; 4, patients with ketoacidosis or hyperosmolarity caused by diabetes mellitus Patients with ketoacidosis or hyperosmolar coma caused by diabetes mellitus; 5. Patients with more serious trauma and bleeding after major surgery. It should be added that patients with advanced cancer do not meet the admission criteria for ICU.