Delayed encephalopathy after acute carbon monoxide poisoning (DEACMP) refers to a group of neuropsychiatric symptoms, mainly acute dementia, that occur again in patients with acute carbon monoxide poisoning after they recover from acute poisoning symptoms after rescue and then appear normal or nearly normal for several days or weeks in a "false recovery period". Carbon monoxide poisoning (CMP), also known as coal gas poisoning, is a disease in which carbon monoxide enters the human body through the respiratory tract and combines with hemoglobin to form carboxyhemoglobin, which reduces or loses the oxygen-carrying capacity of normal hemoglobin, causing hypoxia in tissues throughout the body, but mainly in brain tissues, leading to higher-level neurological dysfunction.