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In page Delirium:

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The most recent area of the hospital in which delirium is just beginning to be monitored routinely in many centers is the Emergency Department, where the prevalence of delirium among older adults is about 10%.[5] A systematic review of delirium in general medical inpatients showed that estimates of delirium prevalence on admission ranged from 10 to 31%.[6] About 5% to 10% of older adults who are admitted to hospital develop a new episode of delirium while in hospital.[5] Rates of delirium vary widely across general hospital wards.[7] Estimates of the prevalence of delirium in nursing homes are between 10% [5] to 45%.[8]