Patients with acute CO poisoning can develop delayed toxic encephalopathy or neuropsychiatric sequelae after a pseudo-healing period of 2-60 days after recovery of consciousness, and the state of recovery of consciousness before the appearance of such symptoms is called the pseudo-healing period, which starts with no symptoms after CO poisoning, and after 1-2 months or so, some symptoms including dementia, hemiparesis, urinary incontinence, blindness, aphasia, hearing loss, tremor palsy and other neurological damage result. symptoms. Patients who encounter CO poisoning should generally pay special attention to the follow-up consultation and follow up after discharge, so that some delayed symptoms can be detected in time for early treatment accordingly.