Cerebral glucose metabolism in idiopathic REM sleep behavior disorder is different from tau-related and α-synuclein-related neurodegenerative disorders: A brain [18F]FDG PET study

Claudio Liguori, Roberta Ruffini, Enrica Olivola, Agostino Chiaravalloti, Francesca Izzi, Alessandro Stefani, Mariangela Pierantozzi, Nicola Biagio Mercuri, Nicola Modugno, Diego Centonze, Orazio Schillaci, Fabio Placidi

Research output: Contribution to journalArticle

Abstract

Introduction: Several longitudinal studies revealed that patients affected by idiopathic REM behavior disorder (iRBD) trend to convert to α-synucleinopathies at follow-up, although the time and direction of conversion is currently unpredictable. This study aimed at evaluating brain glucose metabolism, measured by [18F]FDG-PET, in patients affected by iRBD and compared to Parkinson's Disease (PD), Lewy Body Dementia (DLB), Alzheimer's Disease (AD), and controls. Methods: Differences in brain [18F]FDG uptake were analyzed using statistical parametric mapping implemented in Matlab R2012b among iRBD, PD, DLB, AD, and controls. Results: Fifty-four iRBD, 28 PD, 10 DLB, 55 AD, and 35 controls were included in this study. iRBD patients presented an altered [18F]FDG uptake, since the increased [18F]FDG uptake in the brainstem and the reduced [18F]FDG uptake in temporal and parietal regions compared to controls. Moreover, iRBD patients showed several differences in [18F]FDG uptake than PD, DLB, or AD groups, with the main differences documented in the comparison with AD patients. Conclusions: This study documented the alteration of brain [18F]FDG uptake in brainstem and cortical areas of iRBD patients compared to controls. Moreover, the cerebral [18F]FDG uptake of iRBD patients resulted different from that presented by AD, further supporting the hypothesis that tau-related neurodegeneration may not induce RBD manifestations. However, brain [18F]FDG uptake of iRBD patients also differed from that of DLB and PD patients. Hence, these findings further support the hypothesis that iRBD may represent a very early stage of α-synucleinopathy in which biomarkers changes already occur but not allow the prediction of phenoconversion.

Original languageEnglish
JournalParkinsonism and Related Disorders
DOIs
Publication statusPublished - Jan 1 2019

Keywords

  • Alzheimer's disease
  • Cerebral glucose metabolism
  • Idiopathic RBD
  • Lewy body dementia
  • Neurodegeneration
  • Parkinson's disease
  • [18F]FDG PET

ASJC Scopus subject areas

  • Neurology
  • Geriatrics and Gerontology
  • Clinical Neurology

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