Delirium is a sudden change in brain function that causes inattention and fluctuating confusion, often with altered alertness (drowsy or agitated) and sometimes hallucinations. It’s common in hospital and aged-care settings and needs active screening because it can be missed—especially hypoactive delirium (quiet, withdrawn).
Why it matters
1) Patients
Delirium is associated with worse outcomes, including higher risk of complications, longer recovery, and increased risk of death and longer hospital stay in at-risk groups. In ICU settings, delirium is very common (ICU-focused resources often cite high rates, especially with mechanical ventilation).
2) Families and carers
Families often describe delirium as frightening and distressing, because the person may seem like a “different” version of themselves, may be scared, paranoid, angry, or ashamed, and symptoms can fluctuate.
3) Healthcare systems
Delirium contributes to:
- Longer length of stay
- More complications
- Higher chance of new admission to long-term care after hospitalisation
Practical Prevention Steps
- Identify risk early (older age, frailty, dementia/cognitive impairment, severe illness, infection, dehydration, polypharmacy, sensory impairment).
- Use validated screening tools (don’t rely on “appears confused”): examples include 4AT, CAM, CAM-ICU, etc.
- Prevent with multicomponent care: family input, orienting cues, glasses/hearing aids, sleep support, hydration/nutrition, pain control, early mobilisation, and minimising deliriogenic meds where possible.
Nursing Education Network 
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