Delirium is a neuropsychiatric syndrome characterized by disturbances of awareness, attention, cognitive functions, and behavior.1 It occurs in the severely ill, often older patients2 and is associated with prolonged hospitalization,3 institutionalization, increased costs, long-term cognitive decline, …

Background: Delirium is a geriatric syndrome that presents in 1 out of 5 hospitalized older patients. It is also common in the community, in hospices, and in nursing homes. Delirium prevalence varies according to clinical setting, with rates of under 5% in minor elective surgery but up to 80% in intensive …