Initial CPR refers to the most basic resuscitation methods performed on a patient at the scene by a witness of cardiac arrest before the arrival of a professional emergency team, mainly including chest compressions, unobstructed airway, artificial respiration and defibrillation. The specific methods are: 1. Early identification, if the patient suddenly falls to the ground, can not wake up, see the chest does not rise and fall, can not feel the airflow exhaled from the nose or the patient just sigh-like breathing, you can identify the patient in cardiac arrest. 2. Call for help, call for help 120, call others to help, call others to find an external automatic electric defibrillator. 3. Start CPR, put the patient on the ground or a hard bed The first 30 chest cardiac compressions, the frequency is 100-120 times / min, compression depth of 5-6cm; then open the airway with head pressure chin lift method, oral and nasal cavity with foreign bodies to clean out, there are movable dentures should also be removed; then calm inhalation after mouth-to-mouth artificial respiration 2 times, blowing can be seen when the thorax undulation. Chest compressions and artificial respiration alternately, each cycle includes 30 compressions and 2 artificial respiration, after 5 cycles to quickly determine the patient’s condition until the successful resuscitation or the arrival of 120 emergency personnel to take over the rescue. 4, electric shock defibrillation, there are some public places equipped with automatic external electric defibrillator, also known as AED, get your hands on electric defibrillation according to the voice prompts of the defibrillator.