Gas poisoning is actually carbon monoxide (CO) poisoning. After gas poisoning, it is important not to panic. You can take some self-help measures before sending to the hospital, and be sure to let the poisoned person fully inhale oxygen and pay attention to the smooth flow of the respiratory tract. Where there is an open flame burning place, if the airtight or ventilation is very poor, the concentration of carbon monoxide (CO) in the air can be greatly increased due to incomplete combustion, and acute carbon monoxide poisoning will occur within a short time after people inhale it, and the main manifestation is that the brain is unconscious due to lack of oxygen. The symptoms of gas poisoning include: flushing, headache, dizziness, nausea, ringing in the ears, and slowly developing breathing difficulties and impaired consciousness. When you feel gas poisoning, do not panic, but calmly turn off the gas switch, go to the door or window and open it, then get out of the room. If you are unable to open the door or window, you can break the glass of the door or window to ventilate it and call the rescuer. The basic lesion of CO poisoning is hypoxia, and the main manifestation is brain coma due to lack of oxygen. There are five methods of first aid: 1. Rescuing the poisoned person safely from the poisoned environment and quickly transferring him/her to fresh air. 2. If the poisoned person’s breathing is weak or even stops, immediately perform artificial respiration; as long as the heartbeat still exists, there is a possibility of rescue, and artificial respiration should be insisted on for more than two hours; if the patient has vomited, the vomit in the mouth should be eliminated before artificial respiration. If the heart stops, perform cardiac resuscitation. 3. Supply oxygen quickly. It should be maintained until the poisoned person is conscious. 4.If the poisoned person is in deep coma, dexamethasone 10 mg can be put in 20 ml of 20% glucose solution for slow intravenous injection, and an ice pack should be placed around the head to cool down the brain to prevent or reduce the occurrence of cerebral edema, while transferring to a hospital, preferably one with a hyperbaric oxygen chamber, for a comprehensive and effective treatment of cerebral edema. 5.If there is muscle spasm, Valium 10 mg can be injected intramuscularly or intravenously to control it and reduce the muscle oxygen consumption.