Abstract
IntroductionThe structural and functional damages of the striatum were evident in idiopathic REM sleep behavior disorder (iRBD). With the research on iRBD deepens, cognitive impairment in iRBD is getting increasing attention. However, the mechanism of cognitive impairment in iRBD was poorly understood.MethodsNeuropsychological assessment was carried out in 21 polysomnographies (PSGs) confirmed iRBD patients and 22 normal controls. Both regional homogeneity (ReHo) and seed-based functional connectivity (FC) rs-fMRI analyses were applied to explore the FC abnormalities and its association with cognition in iRBD patients. Positive ReHo clusters were set as seeds for further FC analysis.ResultsIdiopathic REM sleep behavior disorder patients presented cognitive deficits in attention/working memory, executive function, immediate memory, and visuo-spatial ability. ReHo analysis revealed abnormal spontaneous brain activities in the striatum (right caudate, left pallidum and bilateral putamen) in iRBD. FC analysis showed decreased striatum-related FCs in the frontal, temporal, occipital lobes, thalamus, anterior cingulate gyrus, as well as decreased intrinsic FCs between bilateral putamen and between caudate and pallidum. Deficits in attention/working memory, executive function, and immediate memory were associated with abnormal striatal-cortical FCs including frontal, temporal, and anterior cingulate cortices.ConclusionFunctional changes of striatum and cognitive impairment in iRBD were reconfirmed in the present study. Abnormal striatal-cortical networks, especially the striatal-frontal network, contribute to the working memory/executive function deficits in iRBDs. These findings supported the role of striatum not only in motor but also in cognition impairment in iRBD.
Highlights
The structural and functional damages of the striatum were evident in idiopathic REM sleep behavior disorder
No significant differences were observed for age, gender, and education years between the idiopathic REM sleep behavior disorder (iRBD) group and healthy controls (HCs) group
ROCFT_copy, AVLT-N1-3, trail making test B (TMT-B), digit ordering test (DOT), and symbol digital modalities test (SDMT) were chosen for the subsequent association studies
Summary
The structural and functional damages of the striatum were evident in idiopathic REM sleep behavior disorder (iRBD). With the research on iRBD deepens, cognitive impairment in iRBD is getting increasing attention. REM sleep behavior disorder (RBD) is characterized by increased muscle tone in REM sleep, accompanied by dreams and abnormal limb movements. More and more attention has been paid to RBD because of its strong relationship with a variety of neurodegenerative diseases. A meta-analysis of longitudinal studies on iRBD found the risk of developing neurodegenerative diseases was 33.5% after 5 years follow-up, 82.4% at 10 years, and 96.6% at 14.9 years. Among these neurodegenerative diseases, 43% were PD and 25% were DLB (Galbiati et al, 2019)
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