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A 67-year-old male presents with his wife, who reports that for the past 2 years he has been physically acting out his dreams during sleep, punching, kicking, shouting, and once falling out of bed and injuring his shoulder. Polysomnography confirms REM sleep without atonia with dream-enacting behaviors. His neurological examination is currently normal, but the PMHNP notes a mildly reduced sense of smell on olfactory testing and occasional constipation. He has no psychiatric history and no history of medication or substance use that could explain the findings.
Explanation
REM sleep behavior disorder is critically important for PMHNPs to recognize because it is one of the strongest prodromal markers for alpha-synuclein neurodegenerative diseases. Over 80% of patients with isolated RBD will eventually convert to Parkinson's disease, dementia with Lewy bodies, or multiple system atrophy. Prodromal features like hyposmia, constipation, and color vision changes increase this risk further. Diagnosis requires polysomnography showing REM without atonia.
Key Takeaway
REM sleep behavior disorder is a major prodromal marker for synucleinopathies (Parkinson's disease, Lewy body dementia, multiple system atrophy), with over 80% of patients eventually converting, and it requires neurological referral and longitudinal monitoring.