Postoperative Agitation in a Man With Mild Baseline Forgetfulness
An 82-year-old man is admitted with a displaced femoral neck fracture after a mechanical fall and undergoes hip hemiarthroplasty. His wife says he had been "a little forgetful" for two years but managed his own medications and finances with reminders. On postoperative day 2 he is agitated, pulling at his IV, does not recognize his wife, and reports seeing "men on the ceiling." He is awake and drowsy by turns and cannot sustain attention for a conversation. Medications: morphine PCA, hydromorphone 1 mg every 2 hours as needed, diphenhydramine 25 mg at bedtime as needed, oxybutynin 5 mg twice daily, metoprolol, atorvastatin. Temperature 37.9°C, heart rate 104, blood pressure 152/84, oxygen saturation 93% on room air. Bladder scan shows 620 mL. Sodium 131, BUN 34, creatinine 1.3 (baseline 0.9). Chest radiograph shows bibasilar atelectasis. He has not had a bowel movement in three days.
1. Is this delirium, dementia, or both? What features support your answer, and how would you assess him at the bedside?
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This is delirium superimposed on probable mild cognitive impairment, not simply "worsening dementia." The supporting features are acute onset over 48 hours, fluctuating arousal, inattention (he cannot sustain a conversation), visual hallucinations, and failure to recognize his wife - all new. His baseline is "a little forgetful," but he managed medications and finances, so he does not have end-stage dementia.
Bedside assessment uses the Confusion Assessment Method: acute onset with fluctuation plus inattention, and then either disorganized thinking or altered level of consciousness. Test attention with digit span or months backward, and document the collateral baseline from his wife, because the delirium is defined against that baseline.
Screen for the common hidden drivers in a postoperative patient: pain, urinary retention, constipation, hypoxia, and sensory deprivation from missing glasses or hearing aids. Delirium in an older adult is a medical emergency that predicts mortality and long-term functional decline, so the priority is finding and treating the cause rather than sedating the symptom.
2. Which contributing factors can you correct, and what is your immediate nonpharmacologic management?
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Several correctable contributors are visible in the data:
- Urinary retention (620 mL) - catheterize and review the anticholinergic oxybutynin.
- Diphenhydramine - stop it; strongly anticholinergic and a classic delirium trigger.
- Opioids - the PCA plus frequent hydromorphone is likely over-sedating; reduce, and use scheduled acetaminophen and regional analgesia if available.
- Volume depletion and AKI - BUN 34 with creatinine 1.3 from a baseline of 0.9; give fluids and monitor urine output.
- Constipation - no bowel movement in three days; treat it.
- Possible early infection or atelectasis - temperature 37.9°C with tachycardia; obtain CBC and urinalysis, culture only if symptomatic, and pursue incentive spirometry and mobilization.
- Hypoxia at 93% - supplemental oxygen if needed, and remove tethering lines.
Non-drug management first: a family member or sitter at the bedside, glasses and hearing aids in place, daylight and a quiet night, frequent reorientation, early mobilization, avoidance of restraints and Foley catheters, and adequate pain control.
3. He tries to climb out of bed. When and how would you use an antipsychotic?
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Antipsychotics are not routine treatment for delirium. Reserve them for severe agitation that endangers the patient or staff, or that blocks essential care such as physical therapy, after non-drug measures have failed. The behavior of climbing out of bed is first a fall-risk problem: lower the bed, use a floor mat, place him near the nurses' station, and involve family.
If medication is needed: haloperidol 0.5 mg orally or intramuscularly, or quetiapine 12.5–25 mg at night if he is very sensitive to extrapyramidal effects. Avoid antipsychotics entirely in Parkinson disease or Lewy body dementia. Obtain an ECG for QTc, document the indication and target symptom, use the lowest effective dose, and set a stop date - usually within days as the delirium resolves.
Monitor for sedation, orthostasis, and falls. Antipsychotics do not shorten delirium and carry a black-box warning for increased mortality in dementia, so the exit plan matters as much as the start.