The cold winter which is rare for many years brings beautiful snow scenery to people, and also gives people a good “excuse” to eat hot pot, sitting in a circle happily, the scene is warm and cozy, and the retro-shaped and original charcoal hot pot is the delicious food that people are vying for this year, but who knows that there is a hidden killer behind it. Since the beginning of winter this year, the hyperbaric oxygen department of our hospital has accepted more than 60 patients with sudden nausea, weakness and even unconsciousness in the process of eating charcoal hot pot, and they were diagnosed with acute carbon monoxide poisoning after taking medical history and relevant tests. As charcoal hot pot fuel charcoal, when not fully burned can produce toxic gas carbon monoxide, the gas inhaled into the body can lead to dizziness, nausea, vomiting and other adverse feelings, serious cases can lead to severe hypoxic coma or even life-threatening, in the hotel rooms and other closed environment is more likely to aggravate the occurrence of poisoning, therefore, the consumption of charcoal hot pot is best in the open space of the hall, and to maintain good ventilation. You should also pay attention to ventilation when eating other “open fire” type meals for a long time, such as open fireplaces, charcoal grills, hot pots using natural gas, etc. The fuel of such meals may also produce gases harmful to humans during the combustion process, which is unpreventable. When you encounter suspected carbon monoxide poisoning, you should immediately leave the environment that may lead to poisoning, and keep ventilation and fresh air, promptly contact the hospital for medical consultation, and identify and treat other similar diseases according to the doctor’s instructions. Once diagnosed, elderly and frail patients or those with moderate or severe carbon monoxide poisoning should start hyperbaric oxygen therapy as soon as their condition allows, in order to prevent late onset encephalopathy from carbon monoxide poisoning. Related knowledge: I. Carbon monoxide poisoning manifestations: Mild: dizziness, throbbing headache, nausea can occur as the main symptoms, but also dizziness and panic. Moderate: severe headache, vomiting, weakness, and even the appearance of hyperactivity, agitation and other manifestations of impaired consciousness. Heavy toxicity: coma, expiration, shallow and rapid breathing, and tightness of limbs. Hyperbaric oxygen therapy (HBOT): The process of inhaling 100% oxygen in an environment higher than one atmosphere to treat disease is called hyperbaric oxygen therapy. Generally speaking, all hypoxic and ischemic diseases, or a series of diseases caused by hypoxia and ischemia, hyperbaric oxygen therapy can achieve good results; certain infectious diseases and autoimmune diseases, hyperbaric oxygen therapy can also achieve better results. Delayed encephalopathy after acute carbon monoxide poisoning (DEACMP): It refers to carbon monoxide poisoning patients who have been rescued and recovered from acute poisoning symptoms after several days or weeks of normal or near normal performance. After a pseudo-healing period, a group of neuropsychiatric symptoms, mainly acute dementia, reappears. Or some patients with acute carbon monoxide poisoning suddenly develop brain dysfunction with dementia, psychiatric and extrapyramidal symptoms after a period of pseudo-healing after the recovery of normal consciousness in the acute phase. It usually occurs within two months after acute poisoning.