Tremor associated with similar structural networks in Parkinson's disease and essential tremor
Language English Country England, Great Britain Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
34979362
DOI
10.1016/j.parkreldis.2021.12.014
PII: S1353-8020(21)00469-7
Knihovny.cz E-resources
- Keywords
- Essential tremor, Parkinson's disease, Probabilistic tractography, Structural connectome, Tremor,
- MeSH
- Essential Tremor * diagnostic imaging MeSH
- Connectome * MeSH
- Humans MeSH
- Magnetic Resonance Imaging MeSH
- Parkinson Disease * complications diagnostic imaging MeSH
- Tremor MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
INTRODUCTION: Despite substantial clinical and pathophysiological differences, the characteristics of tremor in Parkinson's disease (PD) and essential tremor (ET) patients bear certain similarities. The presented study delineates tremor-related structural networks in these two disorders. METHODS: 42 non-advanced PD patients (18 tremor-dominant, 24 without substantial tremor), 17 ET, and 45 healthy controls underwent high-angular resolution diffusion-weighted imaging acquisition to reconstruct their structural motor connectomes as a proxy of the anatomical interconnections between motor network regions, implementing state-of-the-art globally optimised probabilistic tractography. RESULTS: When compared to healthy controls, ET patients exhibited higher structural connectivity in the cerebello-thalamo-cortical network. Interestingly, the comparison of tremor-dominant PD patients and PD patients without tremor yielded very similar results - higher structural connectivity in tremor-dominant PD sharing multiple nodes with the tremor network detected in ET, despite the generally lower structural connectivity between basal ganglia and frontal cortex in the whole PD group when compared to healthy controls. CONCLUSION: The higher structural connectivity of the cerebello-thalamo-cortical network seems to be the dominant tremor driver in both PD and ET. While it appears to be the only tremor-related network in ET, its combination with large scale hypoconnectivity in the frontal cortico-subcortical network in PD may explain different clinical features of tremor in these two disorders.
Center for Magnetic Resonance Research University of Minnesota Minneapolis MN USA
Central European Institute of Technology Masaryk University Neuroscience Centre Brno Czech Republic
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