Delirium is a complex problem, has a poorly understood pathophysiology, and usually manifests as a fluctuating disturbance of consciousness and cognition that develops over a short period and is associated with physical or mental illness.1 Delirium is not exclusively a complication of critical illness but develops in approximately one-third of patients treated in intensive care units (ICUs).2 The majority of these patients experience hypoactive delirium, a quietly confused state, rather than the more notable cases of agitated delirium, which present as overt hallucinations and hyperactivity.3
Delaney A, Hammond N, Litton E. Preventing Delirium in the Intensive Care Unit. JAMA. 2018;319(7):659–660. doi:10.1001/jama.2018.0159
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