What's the purpose of CPR?

CPR is mainly to achieve effective artificial circulation and respiratory tract gas exchange, so to ensure the supply of blood and oxygen to various organs of the patient. In CPR operation, we must pay attention to chest compression, especially the selection of parts, should be in the lower half of the sternum, compression, elbow joint must be straight, compression depth should be 5-6 cm, compression frequency should be at least 100 times per minute. Before pressing, be sure to open the patient's airway. First, remove foreign bodies from the mouth. If there is vomit, dentures and the like must be removed. You can raise your head to clear his respiratory tract, and then perform effective cardiopulmonary resuscitation.