The position of cardiopulmonary resuscitation (CPR), the patient generally take the lying position, face up, lying on the ground or bed, if the mattress is relatively soft, must be padded on the back of a hard board, so as to be able to force, so as to ensure that the quality of chest compression. In the case of single-person resuscitation, the rescuer usually operates on the right side of the patient’s chest; in the case of two-person resuscitation, the rescuer performing external cardiac compressions is usually on both sides of the patient’s chest, and the rescuer performing airway management is usually in the position of the top of the patient’s head. If an IV is available, it is usually performed on the patient’s hands and lower extremities.