Delirium vs. dementia in a hospitalized elder
A 79-year-old man with mild cognitive impairment (MMSE 24/30 three months ago) is admitted with a hip fracture after a mechanical fall. He is on postoperative day 2. Overnight he becomes agitated, pulls at his IV and catheter, is disoriented to place and time, and is intermittently drowsy. He is on morphine PCA, diphenhydramine for itching, and oxybutynin for urinary retention prophylaxis; his sodium is 132 mEq/L (was 138 on admission), and he has not had a bowel movement in 4 days. His daughter says he was "sharp as a tack" at home last week. The night nurse requests haloperidol and physical restraints.
1. What is the most likely diagnosis, and how do you distinguish it from his underlying cognitive impairment?
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Most likely diagnosis: delirium, likely multifactorial, superimposed on mild cognitive impairment. Key features: acute onset over hours to days, fluctuating course, inattention, disorientation, and a change from his documented baseline ("sharp last week"). Dementia is chronic and progressive; this is a change, which defines delirium. His prior MMSE 24 suggests baseline impairment, which raises delirium risk but does not explain the acute deterioration.
Contributors to identify and correct:
- Opioids (morphine PCA) - common delirium precipitant; reassess analgesic need and consider multimodal analgesia.
- Anticholinergics - diphenhydramine and oxybutynin are both Beers-listed and strongly deliriogenic; stop both.
- Hyponatremia - 132 from 138; evaluate cause (SIADH, fluids) and correct cautiously.
- Constipation - 4 days without a bowel movement; treat.
- Postoperative state, pain, sleep disruption, urinary catheter, immobilization - nonpharmacologic targets.
Assessment tool. Use a validated tool such as the Confusion Assessment Method or 4AT to document and track. Order focused workup: vitals, oxygen saturation, glucose, electrolytes, renal function, urinalysis (only if symptoms suggest UTI - avoid treating asymptomatic bacteriuria), and review all medications.
2. The nurse wants haloperidol and restraints. How do you respond, and what is your first-line management?
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First-line is nonpharmacologic, and restraints should be avoided. Restraints increase agitation, injury, and delirium duration and are a last resort with strict legal and monitoring requirements.
Nonpharmacologic measures:
- Reorientation, familiar faces, glasses and hearing aids, day/night lighting, quiet nights.
- Mobilize early with PT, remove the catheter as soon as possible, treat constipation, maintain hydration and nutrition.
- Involve family at the bedside; use sitters rather than restraints.
- Treat pain with a multimodal, opioid-sparing plan and reassess.
Pharmacologic. Antipsychotics are not first-line and do not treat the cause; reserve them for severe agitation that threatens safety or interferes with essential care, at the lowest dose for the shortest time, and only after nonpharmacologic measures. If used, haloperidol or a short-acting atypical at low dose is reasonable; avoid in Parkinson disease or Lewy body dementia (use quetiapine or clozapine cautiously, or avoid). Monitor for QT prolongation and extrapyramidal effects. Do not use benzodiazepines as first-line (worsen delirium, fall risk).
Documentation and communication. Explain the diagnosis to the family, set expectations about fluctuation, and document the medication changes and rationale.
3. What discharge planning reduces his risk of recurrence?
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Medication review at discharge: remove diphenhydramine and oxybutynin permanently; minimize opioids; avoid new sedatives; provide a reconciled list and counsel the daughter.
Delirium prevention bundle at home and in any future admission: orienting cues, sleep hygiene, early mobilization, hydration, bowel regimen, vision/hearing aids, and pain control.
Fracture and fall prevention: osteoporosis evaluation and treatment, vitamin D, PT for gait and balance, home safety assessment, and a plan for future hospitalizations noting his delirium risk so staff can act early.
Follow-up: reassess cognition in 4–8 weeks once the acute illness resolves to distinguish persistent delirium from progression of underlying cognitive impairment; involve geriatrics and the primary care team. Educate the family that delirium is common, often reversible, and a marker of future risk.