Characteristics Associated With Delirium in Older Patients in a Medical Intensive Care Unit

Abstract
Delirium is an acute disorder of attention and cognition with a reported prevalence of 78% to 87% among intensive care unit (ICU) patients.1-3 Delirium causes increased morbidity, mortality, nursing home placement, longer ICU and hospital stays, and costlier hospitalizations.4,5 In patients who receive mechanical ventilatory assistance, delirium is a predictor of 6-month mortality.6 Patients with 1 episode of delirium had a 40% increase in ICU and total hospital costs, after controlling for confounding variables, compared with patients with no delirium.7 Moreover, delirium is listed as 1 of the 6 leading causes of preventable injury in those older than 65 years.8