Objective To explore the clinical characteristics of delayed encephalopathy after acute carbon monoxide(CO) poisoning and its risk factors.Methods The clinical data,the results of imaging examination and the value of lactic acid of 56 cases of delayed encephalopathy after CO poisoning were retrospectively analyzed.Results 91.1%of the patients showed behavior disorder and aconuresis at first.The CT scanning showed that 94.1%of them had a large area of low-density foci in the basal nuclei.The head MRI examina...