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Mild Alzheimer disease outpatient management — USMLE Step 3 MCQ

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HardPsychiatryMild Alzheimer disease outpatient managementUSMLE Step 3

A 74-year-old man has progressive cognitive fluctuations, recurrent well-formed visual hallucinations, REM-sleep behavior disorder, and spontaneous bradykinesia. MRI shows no strategic infarct. Hallucinations are distressing but not dangerous. Which initial pharmacologic strategy is most appropriate?

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Correct answer: A — Begin rivastigmine and reserve antipsychotic treatment for dangerous psychosis

The best answer is “Begin rivastigmine and reserve antipsychotic treatment for dangerous psychosis”. The combined cognitive fluctuations, formed visual hallucinations, REM-sleep behavior disorder, and parkinsonism identify dementia with Lewy bodies. A cholinesterase inhibitor can improve both cognition and hallucinations. Antipsychotics are reserved for dangerous or otherwise intolerable psychosis because neuroleptic sensitivity can be severe; dopaminergic treatment can worsen hallucinations, and memantine is generally adjunctive rather than the preferred initial strategy.

Reference: Lancet Neurology Review: Management of Lewy Body Dementia: https://pmc.ncbi.nlm.nih.gov/articles/PMC7017451/