Abstract: Objective To investigate the severity of delirium in ICU,analyze its influencing factors,and explore the influence on the prognosis of patients. Methods A total of 410 patients admitted to the general ICU of a tertiary class A hospital in Taiyuan,Shanxi province from September 2022 to September 2023 were included,the patients were divided into subdelirium group,mild-moderate delirium group and severe delirium group. The related data were collected and the patients were followed up for 90 days after discharge. Multivariate logistic regression was used to analyze the factors influencing the severity of delirium. Kaplan-Meier method was used to plot the 90-day cumulative survival curve and Log-rank test was performed. Results The incidence of delirium was 36.77%. Subdelirium,mild to moderate delirium and severe delirium accounted for 32.20%,47.32% and 20.48%. Taking delirium as a reference,age was a risk factor for mild to moderate delirium,mechanical ventilation time was a risk factor for severe delirium. The use of benzodiazepines,procalcitonin,APACHE Ⅱ score,and gastrointestinal function grading were risk factors for the severity of delirium（P<0.05）. The 90-day mortality were significantly different among the patients with different delirium severity（P<0.05）. Conclusion The incidence of delirium in ICU patients was high,mainly mild to moderate delirium. Older age,higher APACHE Ⅱ score,longer duration of mechanical ventilation,higher procalcitonin levels,gastrointestinal dysfunction,and use of benzodiazepine were associated with more severe delirium. The severity of delirium affected the 90-day mortality after discharge.

Key words: Intensive Care Units, Delirium, Severity, Risk Factors, Prognosis, Nursing Care