Delirium is an acute, fluctuating disturbance of attention and awareness that develops over hours to days. It is common in hospitalized older adults, often missed at the bedside, and in a meaningful share of cases it is preventable. Nurses are positioned to catch it first, because the changes that signal delirium show up in the small details of a shift before they show up anywhere else.
Know who is at risk and watch for the quiet presentation
Start every older-adult admission by thinking about delirium rather than waiting for it. NICE identifies four key risk markers to flag on arrival: age 65 or older, cognitive impairment or dementia, a current hip fracture, and severe illness. Layer in the modifiable contributors you will round on all shift: dehydration, immobility, vision and hearing impairment, sleep disruption, uncontrolled pain, infection, constipation, hypoxia, and polypharmacy.
The presentation that gets missed is the quiet one. Hyperactive delirium with agitation and hallucinations is hard to ignore, but hypoactive delirium, where the patient is withdrawn, drowsy, and slow to respond, is more common in older adults and is easy to mistake for fatigue or "a good, quiet patient." NICE specifically advises vigilance for this picture: withdrawal, reduced mobility, and reduced movement.
Delirium develops over hours to days and fluctuates. A patient who was oriented at 0800 and confused at 1400 is the finding, not an inconsistency to explain away.
Anchor your assessment to a validated tool used per facility policy. The Confusion Assessment Method (CAM) is the most widely used and best-validated bedside instrument, with short forms such as the 3D-CAM built for quick use; CAM-ICU is the ICU adaptation. These tools key on acute onset and fluctuating course, inattention, disorganized thinking, and altered level of consciousness.
Build prevention into the shift, not into a separate task
The strongest evidence in delirium care is for prevention, and specifically for multicomponent nonpharmacologic bundles delivered consistently. A review of prevention and treatment in older adults found that multicomponent nonpharmacologic approaches are the most effective prevention strategy, citing a meta-analysis in which delirium incidence dropped by 44 percent. The Hospital Elder Life Program (HELP) is the model these bundles draw from, targeting reorientation, early mobilization, hydration, nutrition, sleep, and hearing and vision adaptation.
Translated to the bedside, that bundle looks like ordinary nursing done deliberately:
- Reorient often. Keep a visible clock and calendar, use clear signage and adequate lighting, and reintroduce yourself, the date, and the reason the patient is in the hospital each shift.
- Restore the senses. Make sure glasses and hearing aids are present, clean, charged, and actually on the patient. Sensory deprivation drives confusion.
- Mobilize early. Get patients up soon after surgery and walking with appropriate aids. Avoid unnecessary lines and catheters that tether them to the bed.
- Protect sleep. Cluster care, lower noise at night, and avoid waking patients for non-urgent procedures during sleeping hours. Use light during the day and darkness at night to anchor the day-night cycle.
- Cover the basics. Encourage fluids and nutrition, ensure dentures fit, assess for and treat pain (including non-verbal pain signs), and watch for constipation, infection, and low oxygen saturation.
A medication review matters here too. Many deliriogenic drugs are ones we give routinely, so flag sedatives, anticholinergics, and other psychoactive agents for the prescriber rather than reaching for medication to manage confusion. AHRQ's patient-safety guidance frames delirium as a preventable harm: avoid medications that precipitate confusion, keep the environment oriented, and treat nonpharmacologically first, reserving short-term low-dose antipsychotics for severe agitation or distress when nondrug measures have failed and per facility protocol.
Escalate, document, and bring family in
When you detect a change, the nursing move is to look for the trigger and escalate. Delirium is a symptom, so screen for the reversible causes you can influence at the bedside: a new infection or urinary retention, dehydration, hypoxia, pain, a recently added medication, constipation. Communicate the change to the provider with a clear before-and-after picture, because the fluctuation and the baseline comparison are what make the diagnosis.
Documentation should be specific and behavioral. Note the time and nature of the change, attention and orientation findings, your screening-tool result, suspected contributors, interventions tried, and the response. "Confused" alone does not capture the trajectory; describe what the patient could and could not do.
Bring family and caregivers into the plan. They know the baseline and will notice subtle slips before staff do, and their presence and familiar objects are genuinely calming. Explain that delirium symptoms can be frightening, that it is usually temporary, and that their reorientation and company are part of the treatment, not a distraction from it. That partnership extends the prevention bundle into the hours when you are with another patient, and it is one of the most reliable safety nets an older adult on your unit can have.