Electroencephalographic Finding in Idiopathic REM Sleep Behavior Disorder.

Area of Science:

• Neurology
• Sleep Medicine
• Neurophysiology

Background:

• REM sleep behavior disorder (RBD) is a parasomnia characterized by motor activity during REM sleep, often leading to injury.
• Idiopathic RBD (iRBD) predominantly affects older men and can be a precursor to synucleinopathies like Parkinson's disease and dementia with Lewy body disease (DLB).
• Identifying early markers for synucleinopathy conversion in iRBD is crucial for timely intervention.

Purpose of the Study:

• To review advancements in quantitative electroencephalography (EEG) research for iRBD over the last decade.
• To explore the relationship between EEG findings and cognitive impairment in iRBD.
• To discuss potential mechanisms underlying EEG changes and cognitive abnormalities in iRBD.

Main Methods:

• Review of quantitative EEG research in iRBD over the past 10 years.
• Analysis of studies correlating EEG slowing with cognitive status in iRBD.
• Discussion of neurophysiological and cognitive mechanisms.

Main Results:

• Quantitative EEG research in iRBD has progressed significantly, particularly concerning EEG slowing.
• EEG slowing, especially when awake, is increasingly recognized as a potential marker.
• A strong association exists between EEG slowing and mild cognitive impairment in iRBD patients, mirroring findings in DLB.

Conclusions:

• Quantitative EEG analysis offers valuable insights into the neurophysiological underpinnings of iRBD.
• EEG slowing and associated cognitive changes in iRBD may serve as indicators for future synucleinopathy development.
• Further research into EEG markers could facilitate early detection and management of neurodegenerative diseases linked to iRBD.