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Delirium is common and increases in prevalence with age and medical complexity. A form of acute brain dysfunction, its presence is associated with significant morbidity, such as cognitive impairment, decreased mobility, depression, and institutionalization, as well as mortality. Many organizations have developed clinical protocols to prevent and treat delirium and what are called "cognitive-friendly" policies to care for elderly patients.
Connell et al. (Sun,) studied this question.