Once someone has suffered a cardiac arrest due to heart disease or other reasons, it is necessary to immediately start first aid, but to carry out correct and effective first aid, pay attention to seize the five points. 1, resuscitation site should be hard. Heart massage must be carried out on a hard bed or table, otherwise the effect will be greatly reduced. 2, press the sternum to be effective. Some people in doing heart massage, desperately squeeze the left chest wall, is the wrong way to operate. In fact, the heart is located roughly in the center of the chest cavity, be sure to put the palm of one hand on the central lower 1/3 of the sternum, with the other hand on it to strengthen the force, so that the heart is squeezed, forcing the blood out of the heart to restore blood circulation. 3, compression and decompression should be thorough. When compressing the sternum, the wrist should be straight, slowly add weight to it, compress the sternum so that it sinks 4~5 cm, then suddenly relax and decompress. Whether compression or decompression, it should be completely and thoroughly, but the hand should still not leave the chest wall when decompression. 4, the frequency should not be too slow. Heart massage chest compression frequency should reach 100 times per minute, too slow can not work. 5, massage breathing with good. Resuscitation of a person by two people, should be done by one person after 15 heart massage, the other person to do 2 artificial respiration. People who do artificial respiration, should pay special attention to the action of the hand of the heart massage, in the interval of its stop compression, immediately blowing, blowing to be large to deep to fast, each blowing time should last more than 2 seconds. If a person is an independent resuscitation, but also to master the frequency of heart massage 15 times, artificial respiration 2 times. It should be reminded that when resuscitating children, the strength must be smaller, such as heart massage when pressing the sternum, only one hand can be used, the pressure is about 1/2 of the adult, but the frequency should be slightly faster than adults, to be greater than 100 times per minute. First, touch the hands and feet, and if the temperature returns slightly, further check the carotid pulsation. As long as a little pulsation can be touched, it is evidence of the start of the heartbeat, at which point the heart massage should be stopped immediately.