Comparison of hospital course and outcome in hospital-acquired vs pre-existing delirium.

Background: Delirium is a major source of morbidity in the inpatient hospital setting. This study examined differences between patients with delirium present prior to hospital admission and those with hospitalacquired delirium in several health outcomes.

Methods: A total of 12,529 patients on 2 inpatient units were included in this retrospective cohort study.