There are many artificial respiration methods, such as mouth-to-mouth artificial respiration (blowing into the patient's mouth), mouth-to-nose artificial respiration (blowing into the patient's nose), mouth-to-nose nasal respiration (blowing to the patient's mouth and nose) The method is applicable to infants and young children, as well as masked artificial respiration. The most common use in pre-hospital first aid is mouth-to-mouth resuscitation. There are also some artificial respirations such as rocker artificial respiration, roller artificial respiration and breast compression artificial respiration, which are less effective and have been rarely used.