Patient cardiac arrest first aid should be handled in accordance with the following steps: 1, confirm the safety of the environment immediately after tapping on both shoulders and shouting, to determine the consciousness of the situation; 2, if the patient has lost consciousness and is not breathing, to be completed within 10 seconds to determine, if you can not determine, please touch the carotid artery pulse professionals, while observing the patient’s chest with or without ups and downs, called around the people to call emergency services, and access to the AED, that is, the Automatic defibrillator, generally in the airport or large supermarkets have, if no AED can remove this step; 3, empty hand fist, quickly whack the patient’s precordial area whack 1-2 times, if you confirm that the patient does not have a heartbeat, respiratory conditions, to the patient for chest compressions, the number of compressions for 30 times, the point of compression for the lower part of the sternum, the depth of the compression of 5-6cm, the frequency of 100-120 times / min; 4, to the The patient to open the airway, for forehead lifting jaw method of artificial respiration 2 times, each blowing time more than 1 second, blowing the best can see the patient’s chest rise and fall, every 30 times after the pressure to repeat 2 times blowing, until the AED delivery, immediately to the patient’s cardiac rhythm analysis and defibrillation, until the patient’s heart rate is restored, or so the cycle of 5 cycles, the above cycle of compression and ventilation cycle of 30:2, to be repeated 5 cycles until the patient’s heart rate or until a professional EMT arrives to take over.