How to use artificial respiration first aid in nitrogen poisoning?

Nitrogen poisoning at atmospheric pressure is characterized by simple asphyxiation. Nitrogen accounts for about 4/5 of the air, when the nitrogen content in the air increases (84%) can exclude the oxygen in the air, triggering the partial pressure of oxygen in the inhalation gas is too low (0.16 ATA), the person feels that the breathing is not smooth, the sense of suffocation and a high concentration of nitrogen (90%) can be triggered by simple asphyxiation, manifested as headache, nausea, vomiting, chest constriction, chest pain, 4 limbs, paralysis, muscle tone, paroxysmal spasms, cyanosis, pupils, weak reaction to light and other critical symptoms. The symptoms of crisis such as narrowing of pupils, weakening of reaction to light, etc., and the severe cases will rapidly fall into coma and even die. Nitrogen under high pressure can firstly cause decompression sickness, and secondly, when the partial pressure of nitrogen in the inhalation gas exceeds 3.2 ATA, nitrogen anesthesia can be produced, which mainly affects the nervous system and produces mental activity disorders and neuromuscular adjustment disorders, and such states are usually reversible. In addition, liquid nitrogen has a deep hypothermic effect, and even a small amount of skin contact can cause severe burns. Asphyxiation unconsciousness in a timely manner to the hospital, the ambulance should be taken before the future arrival of the side of the way~~