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Cardiac autonomic dysfunction in idiopathic REM sleep behavior disorder
Ronald B Postuma1, Paola A Lanfranchi, Helene Blais
1Department of Neurology, McGill University, Montreal General Hospital, Montreal, Quebec, Canada.
Summary
Autonomic dysfunction is common in REM sleep behavior disorder (RBD), but beat-to-beat variability measures do not predict Parkinson's disease or dementia development. This suggests autonomic issues are linked to RBD itself, not future neurodegeneration.
Area of Science:
- Neurology
- Sleep Medicine
- Autonomic Neuroscience
Background:
- Idiopathic REM sleep behavior disorder (RBD) is a significant risk factor for developing Parkinson's disease (PD) and Lewy body dementia (LBD).
- Autonomic abnormalities are suggested in RBD, but their predictive value for neurodegenerative disease remains unclear.
- Beat-to-beat RR variability analysis is a tool to assess autonomic function.
Purpose of the Study:
- To investigate whether autonomic abnormalities, assessed by RR variability, can predict the development of neurodegenerative disease in patients with idiopathic RBD.
- To compare autonomic function between idiopathic RBD patients who developed neurodegenerative disease and those who did not, as well as with healthy controls.
Main Methods:
- Retrospective analysis of polysomnographic (PSG) traces from 99 patients with idiopathic RBD.
- Selection of patients who developed parkinsonism or dementia, matched with disease-free RBD patients and controls.
- Assessment of time and frequency domain measures of beat-to-beat RR variability from baseline PSG.
Main Results:
- Patients with idiopathic RBD showed significantly reduced RR variability (SD, VLF, LF components) compared to controls.
- No significant differences in RR variability measures were found between idiopathic RBD patients who developed neurodegenerative disease and those who remained disease-free.
- The observed autonomic dysfunction in idiopathic RBD was consistent regardless of subsequent neurodegenerative disease development.
Conclusions:
- Beat-to-beat RR variability analysis confirms substantial autonomic dysfunction in idiopathic RBD.
- Autonomic dysfunction in idiopathic RBD appears to be independent of the subsequent development of Parkinson's disease or Lewy body dementia.
- Autonomic dysfunction is intrinsically linked to idiopathic RBD itself, rather than serving as a predictor for specific neurodegenerative outcomes.
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