Nurses can rescue critically ill patients according to doctor's advice and prescription. The principle of rescue is to keep the respiratory tract unobstructed, maintain blood circulation, maintain life, prevent injury or disease deterioration, and promote the recovery of health.

Patients with normal breathing and heartbeat but unconscious should be allowed to lie in a recovery posture. This posture can keep the injured person's respiratory tract unobstructed and prevent the root of the tongue from falling backwards. The principle of controlling blood loss is to limit the blood flow to the wound and make blood clots form as soon as possible.