Abstract
Delirium is a cognitive disorder characterized by acute onset, fluctuating course, altered level of consciousness, inattention, disorganized thinking, disorientation, memory impairment, and perceptual and motor disturbances (American Psychiatric Association, 2000; World Health Organization, 2010). It occurs in hyperactive, hypoactive, or mixed forms in up to 42% of older hospital inpatients (Siddiqi et al., 2006) and 70% of older long-term care residents (McCusker et al., 2011). In both settings, delirium is independently associated with poor outcomes (Siddiqi et al., 2006; McCusker et al., 2010; Witlox et al., 2010).
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