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Published in: Journal of Neurology 9/2021

01-09-2021 | Parkinson's Disease | Original Communication

Limbic hypoconnectivity in idiopathic REM sleep behaviour disorder with impulse control disorders

Authors: Ana Marques, Daniel Roquet, Elie Matar, Natasha Louise Taylor, Bruno Pereira, Claire O’Callaghan, Simon J. G. Lewis

Published in: Journal of Neurology | Issue 9/2021

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Abstract

Introduction

Current neuroimaging research has revealed several brain alterations in idiopathic REM sleep behaviour disorder (iRBD) that mirror and precede those reported in PD. However, none have specifically addressed the presence of changes across the reward system, and their role in the emergence of impulse control disorders (ICDs). We aimed to compare the volumetric and functional connectivity characteristics of the reward system in relation to the psychobehavioral profile of patients with iRBD versus healthy controls and PD patients.

Methods

Twenty patients with polysomnography confirmed iRBD along with 17 PD patients and 14 healthy controls (HC) underwent structural and functional resting-state brain MRI analysis. Participants completed the questionnaire for impulsive-compulsive disorders in PD (QUIP), the short UPPS-P impulsive behaviour scale, as well as neuropsychological testing of cognitive function.

Results

A higher percentage of iRBD patients reported hypersexuality, compared to HC and PD (p = 0.008). Whole-brain and striatal voxel-based morphometry analyses showed no significant clusters of reduced grey matter volume between groups. However, iRBD compared to HC demonstrated functional hypoconnectivity between the limbic striatum and temporo-occipital regions. Furthermore, the presence of ICDs correlated with hypoconnectivity between the limbic striatum and clusters located in cuneus, lingual and fusiform gyrus.

Conclusion

Altered functional connectivity between the limbic striatum and posterior cortical regions was associated with increased hypersexuality in iRBD. It is possible that this change may ultimately predispose individuals to the emergence of ICDs when they receive dopaminergic medications, after transitioning to PD.
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Metadata
Title
Limbic hypoconnectivity in idiopathic REM sleep behaviour disorder with impulse control disorders
Authors
Ana Marques
Daniel Roquet
Elie Matar
Natasha Louise Taylor
Bruno Pereira
Claire O’Callaghan
Simon J. G. Lewis
Publication date
01-09-2021
Publisher
Springer Berlin Heidelberg
Published in
Journal of Neurology / Issue 9/2021
Print ISSN: 0340-5354
Electronic ISSN: 1432-1459
DOI
https://doi.org/10.1007/s00415-021-10498-6

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