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Motor Cortical Network Excitability in Parkinson's Disease.
- Source :
-
Movement disorders : official journal of the Movement Disorder Society [Mov Disord] 2022 Apr; Vol. 37 (4), pp. 734-744. Date of Electronic Publication: 2022 Jan 09. - Publication Year :
- 2022
-
Abstract
- Background: Motor impairment in Parkinson's disease (PD) reflects changes in the basal ganglia-thalamocortical circuit converging on the primary motor cortex (M1) and supplementary motor area (SMA). Previous studies assessed M1 excitability in PD using transcranial magnetic stimulation (TMS)-evoked electromyographic activity. TMS-evoked electroencephalographic activity may unveil broader motor cortical network changes in PD.<br />Objective: The aim was to assess motor cortical network excitability in PD.<br />Methods: We compared TMS-evoked cortical potentials (TEPs) from M1 and the pre-SMA between 20 PD patients tested off and on medication and 19 healthy controls (HCs) and investigated possible correlations with bradykinesia.<br />Results: Off PD patients compared to HCs had smaller P30 responses from the M1s contralateral (M1+) and ipsilateral (M1-) to the most bradykinetic side and increased pre-SMA N40. Dopaminergic therapy normalized the amplitude of M1+ and M1- P30 as well as pre-SMA N40. We found a positive correlation between M1+ P30 amplitude and bradykinesia in off PD patients.<br />Conclusions: Changes in M1 P30 and pre-SMA N40 in PD suggest that M1 excitability is reduced on both sides, whereas pre-SMA excitability is increased. The effect of dopaminergic therapy and the clinical correlation suggest that these cortical changes may reflect abnormal basal ganglia-thalamocortical activity. TMS electroencephalography provides novel insight into motor cortical network changes related to the pathophysiology of PD. © 2022 International Parkinson and Movement Disorder Society.<br /> (© 2022 International Parkinson and Movement Disorder Society.)
Details
- Language :
- English
- ISSN :
- 1531-8257
- Volume :
- 37
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Movement disorders : official journal of the Movement Disorder Society
- Publication Type :
- Academic Journal
- Accession number :
- 35001420
- Full Text :
- https://doi.org/10.1002/mds.28914