Accidents are often unpredictable, but the skills of first aid can come in handy in times of crisis. When you find that a person’s whistling and heartbeat have stopped, using the following 3 first aid skills may save his life. 1, artificial whistling. Artificial suction usually takes the mouth-to-mouth method, with your whistling gas blowing the lungs of the sick and injured to ensure a minimum supply of oxygen to maintain their lives. When implementing artificial suction, one hand pressed on the forehead of the sick or injured, so that their heads back, the index and middle fingers of the other hand placed at their jaws, lifting the jaws to keep their airways open. Next, the first aider pinches the patient’s bilateral nostrils with the hand that is pressing on the forehead. Then, wrap the lips of the injured patient’s mouth tightly with the lips of the mouth and blow inward smoothly under the operation of keeping the airway open, but be careful not to leak air, if the blowing is effective, his chest will puff up and fall with the gas whistling. After blowing, the first aiders mouth and lips away, and release the fingers pinching the nose, so that the gas whistle, while turning the head sideways to whistle fresh air, and then the second blowing. Each blowing time for adults not less than 1 second, children 1 second to 1 and a half seconds, the frequency of 8-12 times per minute early. 2, chest cardiac compressions. When the human heart stops beating, the blood circulation is also terminated, and chest heart compressions is to promote blood circulation with external force. The location of the compression is above the sternum and between the two breasts, with the palms of both hands overlapping in this area, fingers straight or crossed and interlocked. During compressions, lean forward, straighten your arms, place your shoulders directly above the patient’s sternum, press down hard vertically for 5 cm (adults), then relax, but do not leave your hands on your chest, at least 100 times per minute (adults), with an even rhythm. A special reminder is that manual whistling should be alternated with chest compressions, 30 times. Blowing 2 times for a cycle, this process is also called “cardiopulmonary resuscitation”. 3, trauma to stop bleeding. Blood loss of more than 40% of the blood volume of the whole body, life will be threatened. The most common method to stop bleeding from trauma is to apply pressure bandages to stop bleeding, which can be used for wounds on the head, limbs and all parts of the body. The specific method is to have the patient sit or lie down, elevate the injured part, put the sterilized gauze over the wound, then press directly on it with your hand and press for 5-10 minutes, after that, wrap the wound with a bandage or triangular towel to help stop the bleeding. If there is swelling and numbness in the wound, it indicates improper dressing. When the body bleeds, if it is jet bleeding, it means it is arterial bleeding. While handling it, you can press the top of the bleeding wound with your hand, which can effectively stop the bleeding, but this method should not be pressed for more than 10 minutes each time, otherwise it will affect the blood supply of the whole limb.