New Agitation on Hospital Day 2 in an Older Man With COPD
A 78-year-old man with COPD and mild cognitive impairment is hospitalized for a COPD exacerbation. On hospital day 2 he becomes agitated, pulls at his IV line, and does not know where he is; he was oriented and independent at home. Medications: prednisone 40 mg daily, ceftriaxone, azithromycin, nebulized albuterol-ipratropium every 4 hours, oxybutynin 5 mg twice daily for urinary urgency, diphenhydramine 25 mg at bedtime as needed (given each of the last 3 nights), and donepezil 5 mg daily. Temperature 37.4°C, pulse 104, blood pressure 138/76 mmHg, respiratory rate 22, SpO2 91% on 2 L nasal cannula. He has not had a bowel movement in 3 days and has not voided in 8 hours. Glucose 118 mg/dL, sodium 132 mmol/L, creatinine 1.6 mg/dL (baseline 1.0), WBC 11,200/µL. Urinalysis shows 5-10 WBC/hpf with negative nitrite and leukocyte esterase, and no dysuria is documented. He takes no anticoagulants and has had no falls or head trauma.
1. What is the most likely explanation for his agitation, and what are your first three actions?
Read the worked answer
This is delirium, and the first task is to stop looking for a single cause. In an older adult with mild cognitive impairment the contributors are additive: anticholinergic load from oxybutynin plus nightly diphenhydramine, high-dose prednisone, hypoxemia at 91%, a rising creatinine that may reflect volume depletion or urinary retention, constipation, and disrupted sleep on an unfamiliar ward. He has not voided in 8 hours and has not had a bowel movement in 3 days, both easy to miss and easy to fix.
First actions: bladder scan for retention, discontinue oxybutynin and diphenhydramine, and begin nonpharmacologic measures - reorientation, glasses and hearing aids, mobilization, daylight exposure, and uninterrupted sleep. Titrate oxygen to a target saturation of 88-92% for COPD rather than 94-98%, since overoxygenation can worsen hypercapnia. Review the medication list for other deliriogenic agents, treat pain and constipation, and check a basic metabolic panel and glucose; the sodium of 132 and creatinine of 1.6 require an explanation, and the bladder scan may supply it.
2. Which tests are indicated, and which are likely to be low-yield or harmful?
Read the worked answer
Indicated: repeat electrolytes and creatinine, glucose, oxygen saturation or blood gas if his work of breathing worsens, urinalysis (already done), a bladder scan, and a thorough medication review. An ECG is reasonable before adding any new agent. Low-yield or actively harmful: CT head without focal deficit, head trauma, or anticoagulation - his examination has no lateralizing signs, he takes no anticoagulant, and a routine scan is unlikely to change management while risking sedation during transport. Lumbar puncture is not indicated without fever, meningismus, or immunocompromise.
Blood cultures and antibiotics driven by the urinalysis are not indicated. Five to ten WBC per high-power field with negative nitrite and leukocyte esterase in a man without dysuria is not a urinary tract infection, and treating asymptomatic bacteriuria in a delirious patient is a classic error that does not shorten delirium and selects for resistance. The mild leukocytosis is explainable by prednisone and does not localize an infection. The creatinine rise should be pursued with a volume assessment and a post-void residual rather than assumed to be contrast or drug related.
3. If nonpharmacologic measures fail and he remains a danger to himself, how do you manage the agitation?
Read the worked answer
Nonpharmacologic management remains first-line and should continue even if medication is eventually used. If he is an immediate danger to himself or staff, and only then, use the lowest effective dose of an antipsychotic for the shortest time - for example haloperidol 0.5-1 mg or quetiapine 12.5-25 mg - with the explicit understanding that this treats agitation, not delirium, and that antipsychotics carry increased mortality and cerebrovascular risk in older adults with dementia. Document the indication and set a stop date.
Avoid benzodiazepines, which are a leading cause of prolonged and paradoxical delirium, except in alcohol or benzodiazepine withdrawal, where they are the treatment of choice. Avoid physical restraints where possible and never use them as a substitute for treating the cause. Reassess frequently and stop the antipsychotic as soon as agitation resolves. If delirium does not improve after correcting hypoxia, medications, retention, and constipation, broaden the evaluation rather than escalating sedation.