Hyperactive Delirium in the Last Days of Life
Mr. L, 78, with metastatic gastric cancer, is admitted to inpatient hospice with a 2-day history of agitation. He is picking at his gown, trying to climb out of bed, moaning, and does not recognize his daughter. He is restless and diaphoretic. He is on morphine 30 mg PO q4h scheduled (no rescue in 24 hours), dexamethasone 4 mg daily, diphenhydramine 25 mg q6h prn (received 3 doses), oxybutynin 5 mg BID, and haloperidol 0.5 mg q8h prn (one dose). Vitals: HR 104, BP 102/60, RR 22, SpO2 93% on room air, T 37.8. Abdomen is distended, no bowel movement in 4 days, bladder not palpable. Labs last week: calcium 11.8. Family is distressed and asks for 'something to calm him down.' The nurse asks whether to give lorazepam.
1. List the likely contributors to his agitation and identify which medications should be stopped or changed.
Read the worked answer
His agitation is delirium, not simple anxiety, and is multifactorial. Contributors include: (1) anticholinergic burden from diphenhydramine and oxybutynin; (2) constipation (4 days without stool, distended abdomen); (3) possible urinary retention (check bladder scan); (4) hypercalcemia (11.8 last week); (5) opioid toxicity from scheduled morphine without rescue, with possible myoclonus; (6) infection (low-grade fever, tachycardia); and (7) steroids. Stop diphenhydramine and oxybutynin immediately. Treat constipation with an aggressive bowel regimen and disimpaction if needed; check bladder scan and catheterize if retained; recheck calcium and treat with fluids or calcitonin if symptomatic; consider urine culture only if it will change management. Reduce or rotate the morphine if myoclonus is present. Nonpharmacologic measures include family presence, orientation, glasses and hearing aids, low stimulation, and avoiding restraints.
2. Which pharmacologic agent would you choose for hyperactive delirium, and why not a benzodiazepine first?
Read the worked answer
For hyperactive delirium in a dying patient, start haloperidol 0.5–1 mg PO/SC/IV every 2–4 hours as needed, with a scheduled dose if frequent. Quetiapine 12.5–25 mg is an alternative, especially if parkinsonism is present. Benzodiazepines are not first-line because they can worsen delirium, cause paradoxical agitation, and increase falls; they are appropriate for alcohol or benzodiazepine withdrawal, seizures, or as an adjunct when delirium is refractory and the patient is imminently dying. Lorazepam 0.5 mg may be added cautiously if the patient remains distressed despite antipsychotic treatment and reversible causes are addressed. In the last hours to days, the threshold for using a benzodiazepine or palliative sedation is lower when the goal is comfort. Monitor sedation and respiratory rate, and document the target symptom.
3. The family asks about palliative sedation. How do you respond, and what criteria guide its use?
Read the worked answer
Palliative sedation is the deliberate lowering of consciousness to relieve refractory intolerable suffering in a patient with a terminal illness and a prognosis of hours to days. It is not euthanasia and is not intended to hasten death. Before proceeding, confirm that reversible causes have been addressed, that symptoms are refractory to aggressive conventional therapy, and that the patient or surrogate understands the goal is comfort. Obtain multidisciplinary agreement and document informed consent. Midazolam 1–5 mg SC/IV bolus followed by infusion, or lorazepam, is typical; continue analgesics and stop non-essential medications. Reassure the family that the agitation is due to delirium and that comfort is the priority. If the family is asking for 'something to calm him' because they cannot bear the agitation, explore their distress and offer presence, explanations, and respite.