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[Hallucination in opsoclonus-polymyoclonus syndrome]
Y Fujimoto1, E Isozaki, T Ootake
1Department of Neurology, Tokyo Metropolitan Neurological Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|February 12, 1998
Summary
Opsoclonus-polymyoclonus syndrome (OPS) linked to viral encephalitis may involve REM sleep dysfunction. Serotonergic neuron abnormalities in the dorsal raphe nucleus could contribute to OPS development.
Area of Science:
- Neuroscience
- Neurology
- Sleep Medicine
Background:
- Opsoclonus-polymyoclonus syndrome (OPS) is a rare autoimmune disorder.
- Viral encephalitis can trigger various neurological symptoms.
Observation:
- Two cases of OPS associated with viral encephalitis presented with sleep disturbances and vivid, colorful hallucinations.
- Hallucinations occurred predominantly at bedtime, resembling hypnagogic hallucinations.
- One patient experienced auditory hallucinations, while the other exhibited dreamlike behavior during sleep.
Findings:
- The observed symptoms, including sleep disturbance, hypnagogic hallucinations, and dreamlike behavior, suggest a potential link between OPS and REM sleep.
- REM sleep regulation involves serotonergic projections from the dorsal raphe nucleus.
- Brainstem lesions and serotonergic abnormalities have been reported in OPS.
Implications:
- Dysfunction of serotonergic neurons in the dorsal raphe nucleus may play a role in the pathogenesis of OPS.
- Further research into the neurobiological mechanisms connecting viral encephalitis, sleep disturbances, and OPS is warranted.
- Understanding these links could lead to novel diagnostic and therapeutic strategies for OPS.