Cardiac arrest is a common clinical emergency and an important factor leading to acute or short-term death. The heart is the blood pump of the human body, and if the heart does not work, important organs and tissues around the body will not be fed with blood, resulting in damage or even necrosis. Although the disease is dangerous, but not without timely hospital treatment must be surrendered to the “death”, skilled and formal CPR, you can fight for life, and thus reduce the mortality rate to a certain extent. The implementation of cardiopulmonary resuscitation is predicated on cardiac arrest, and ventricular fibrillation (or ventricular fibrillation, as we often call it) is the direct cause, and there are many factors underlying cardiac arrest, some of which can lead to ventricular fibrillation. The common pathological factors are: 1, coronary embolism 2, electrolyte abnormalities especially high/low potassium 3, pulmonary embolism 4, hypovolemia 5, pericardial tamponade 6, hypoglycemia/hyperglycemia 7, pneumothorax, asthma 8, hypothermia or hypothermia 9, drugs 10, hypoxia When you see someone suddenly fall to the ground with loss of consciousness, you start the process of first aid, but you need to clearly understand that there is respiratory arrest before you can If this is not the case, the blind implementation of CPR may not help the patient or even lead to aggravation of the condition or unnecessary injury. CPR process 1, first ensure the safety of the surrounding site. The location where the patient fell may be a road or downtown, passing cars or crowds may pose a danger to the patient and the rescuer. 2, check the patient’s response. The rescuer should tap the patient’s shoulders and shout “What’s wrong with you” in the left and right ears respectively (to prevent the patient from hearing loss). After that, check the respiration and carotid pulse at the same time (check time not more than 10 seconds), if the patient has normal respiration and pulse, wait for the arrival of emergency personnel. If you find that breathing cannot be measured, or there is sigh-like breathing, or there is no pulse, then go to the next step. 3.Call for help from nearby people and call the emergency number. 4.If there is no breathing and there is a pulse, perform artificial respiration. First check and clean the patient’s airway to ensure a clear airway, hold the patient’s jaw up with the middle finger of the index finger, pinch the patient’s nasal cavity with the other hand, and perform mouth-to-mouth or simple respirator ventilation once every 5-6 seconds. No deep inhalation is required for mouth-to-mouth, normal inhalation is sufficient, keep blowing up for more than 1 second and observe the rise and fall of the chest to achieve full ventilation, check breathing every 2 minutes, if there is no pulse, CPR can be performed. 5.In the case of no breathing or sigh-like breathing only and no pulse, start CPR. Ensure that the patient lies flat, first expose the patient’s chest (minimize chest clothing), in the lower half of the sternum (or the middle of both breasts), hands folded together, the upper fingers must not be on the palm side of the lower hand, to ensure that the contact surface with the patient’s chest is “flat”, the upper arm remains straight, not flexed, perpendicular to the patient’s chest plane for compressions, compressions The palm heel should not leave the skin of the chest when lifting, and let the chest fully recover after compressions, with a frequency of 100-120 times/minute and a compression depth of about 5-6 cm, and perform 2 ventilations after 30 compressions, in the same way as above, with 30 chest compressions and 2 ventilations as a group for 2 minutes or 5 groups of CPR to change the rescuer, while checking the respiratory pulse again, with an interval of no more than 5 seconds. If there is no respiratory heartbeat recovery, continue the above process until the arrival of medical personnel or professional rescuers