A 79-year-old client on trihexyphenidyl for Parkinson tremor… | MyMerci
Crisis InterventionPSI
Question
A 79-year-old client on trihexyphenidyl for Parkinson tremor is hospitalized with new confusion, urinary retention, and dry mouth. Which is the nurse's most appropriate interpretation?
1Symptoms of acute pulmonary embolism
2These are normal findings for an elderly client
3Anticholinergic toxicity from trihexyphenidyl — Beers Criteria recommend avoiding anticholinergic antiparkinsonian agents in older adults✓ Correct answer
4Signs of NMS from the trihexyphenidyl
Explanation
Correct (2): The constellation — confusion, dry mouth, urinary retention, constipation, blurred vision — is classic anticholinergic toxicity. Beers Criteria strongly recommend AVOIDING anticholinergic antiparkinsonian drugs (trihexyphenidyl, benztropine) in older adults due to delirium, fall, and cognitive decline risk; safer alternatives (carbidopa-levodopa, amantadine) are preferred. (1) Not normal. (3) PE has different presentation. (4) NMS requires fever, rigidity, autonomic instability.
In-depth explanation
Memory Tip Anticholinergic toxicity = "Hot as a hare, Dry as a bone, Red as a beet, Blind as a bat, Mad as a hatter, Full as a flask" — hyperthermia, dry, flushed, mydriasis, delirium, urinary retention.
Clinical scenario
Scenario 79-year-old male, Parkinson disease on trihexyphenidyl 4 mg/day, admitted with new confusion, urinary retention, dry mouth, constipation, blurred vision.
Key concepts
Anticholinergic burden — Cumulative anticholinergic load from multiple medications; significant cognitive risk in older adults.
Beers Criteria — AGS list of medications potentially inappropriate for adults ≥65; includes anticholinergic antiparkinsonian agents.
Anticholinergic toxicity — "Hot/Dry/Red/Blind/Mad/Full" symptom complex from excess muscarinic blockade.