Acute Confusion & Sudden Delirium: Step-by-Step for Student Nurses
You walk into a bay at 02:00 to find a patient who was completely lucid at tea time now trying to climb over bed rails, pulling out their IV cannula, or calling for help in terror. Sudden acute confusion — delirium — is a medical emergency indicating underlying physical illness. Here is your evidence-based roadmap.
“Delirium is a sign of acute brain failure caused by physical illness. Never assume acute confusion is ‘just dementia’ or ‘old age’ — sudden mental state changes demand an immediate physical investigation.”
— NICE Clinical Guideline CG103 (Delirium)
📎 Source: NICE CG103: Delirium — Prevention, Diagnosis and Management
1. Delirium vs. Dementia: Spotting the Difference
Distinguishing acute delirium from pre-existing dementia changes how you care for the patient:
Onset: Rapid — hours to days.
Course: Fluctuates dramatically, often worse at night.
Attention: Severely impaired.
Reversible: Yes — treat the cause and it resolves.
Onset: Slow — months to years.
Course: Stable hour to hour.
Attention: Generally intact in early stages.
Reversible: No — progressive condition.
📎 Source: NICE CG103 — Delirium identification and assessment
⚠️ Local trust screening pathways may vary. Always confirm which delirium assessment tool your ward uses — some trusts use CAM-ICU or other tools alongside or instead of 4AT.
2. Bedside Screening: The 4AT Delirium Tool
The 4 ‘A’s Test (4AT) is the tool recommended by NICE for rapid delirium screening across most NHS settings:
📋 THE 4AT DELIRIUM ASSESSMENT TOOL
Score ≥ 4 = Likely Delirium. Urgent investigation required!
📎 Sources: NICE CG103 (endorses 4AT) | The4at.com — Official Tool Website
⚠️ Check your local delirium screening policy. Some wards use alternative tools (e.g. CAM-ICU in critical care). Always follow your trust’s approved pathway.
3. Finding the Cause: The PINCH ME Framework
Delirium is a symptom — search systematically for the physical trigger using this mnemonic endorsed in UK delirium guidance:
🔍 PINCH ME — Systematic Cause Checklist
- P — Pain: Uncontrolled pain is a major trigger. Check surgical sites, pressure areas, fractures.
- I — Infection: UTI (dipstick urine), chest infection (auscultation/sputum), sepsis (NEWS2/CRP).
- N — Nutrition & Neurological: Hypoglycaemia (<4.0 mmol/L), hypoxia, electrolyte imbalance.
- C — Constipation: Faecal impaction causes acute confusion — check bowel chart and abdominal palpation.
- H — Hydration: Dehydration, AKI, hyponatraemia — check fluid balance and U&Es.
- M — Medication: Sedatives, anticholinergics, opioids, withdrawal from alcohol/sedatives — review drug chart.
- E — Environment: Sensory deprivation (missing glasses/hearing aids), sleep disruption, disorientation.
📎 Source: NICE CG103 — Identifying and addressing contributing factors
⚠️ Local investigation protocols may differ. Follow your trust’s delirium care pathway for which blood tests, observations, and screening tools are required.
4. De-Escalation & Non-Pharmacological Care
NICE guidance states non-pharmacological approaches are always first-line — never use medication as a first response:
- Speak calmly and reorientate: “I’m Daniel, your nurse. You’re in hospital, it’s Thursday morning.” — explain who you are and where they are.
- Restore sensory clarity: Ensure glasses and hearing aids are working and in place — deprivation worsens confusion.
- Day/night orientation: Open blinds by day; keep lighting low and noise minimal at night. Provide a visible clock and calendar.
- Avoid confrontation: Do not grab or restrain unless immediate risk to safety. Offer reassurance, a drink, or a safe walk with supervision.
- Involve family: Familiar faces reduce distress. Encourage visitors where possible.
📎 Source: NICE CG103 — Delirium prevention & non-pharmacological management
⚠️ De-escalation and restraint policies vary by trust. Familiarise yourself with your ward’s specific protocol and escalation procedure before a situation arises.
5. Escalation: Word-for-Word SBAR Script
When contacting the medical team, use this structured approach:
- S — Situation: “This is Student Nurse [Name] on [Ward]. I’m calling about [Patient Name], who developed acute confusion overnight. 4AT score is 6.”
- B — Background: “Admitted 2 days ago post-op. No known dementia — fully oriented yesterday.”
- A — Assessment: “NEWS2 score 3, temp 37.9°C, urine cloudy, pulling at lines. Blood glucose 6.2 mmol/L.”
- R — Need: “Urgent review — bloods, urine dip/culture, screen for infection, pain review.”
Acute Hypoglycaemia & The Rule of 15
Hypo recognition, stepwise treatment, and safe escalation.
Published by TheStudentNurse.co.uk — Honest, evidence-based support for every student nurse.
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