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Cholinergic nucleus 4 atrophy and gait impairment in Parkinson’s disease

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Abstract

Background

There is evidence that cortical cholinergic denervation contributes to gait and balance impairment in Parkinson’s Disease (PD), especially reduced gait speed.

Objectives

The objective of this study was to determine the relationship between cholinergic basal forebrain gray matter density (GMD) and gait in PD patients.

Methods

We investigated 66 PD patients who underwent a pre-surgical evaluation for a neurosurgical procedure to treat motor symptoms of PD. As part of this evaluation patients had a brain MRI and formal gait assessments. By applying probabilistic maps of the cholinergic basal forebrain to voxel-based morphometry of brain MRI, we calculated gray matter density (GMD) for cholinergic nucleus 4 (Ch4), cholinergic nucleus 1, 2, and 3 (Ch123), and the entire cortex.

Results

Reduced Ch4 GMD was associated with reduced Fast Walking Speed in the “on” medication state (FWSON, p = 0.004). Bilateral cortical GMD was also associated with FWSON (p = 0.009), but Ch123 GMD was not (p = 0.1). Bilateral cortical GMD was not associated with FWSON after adjusting for Ch4 GMD (p = 0.44). While Ch4 GMD was not associated with improvement in Timed Up and Go (TUG) or Cognitive TUG in the “on” medication state, reduced Ch4 GMD was associated with greater percent worsening based on dual tasks (p = 0.021).

Conclusions

Reduced Ch4 GMD is associated with slower gait speed in PD and greater percent worsening in TUG during dual tasks in patients with PD. These findings have implications for planning of future clinical trials investigating cholinergic therapies to improve gait impairment in PD.

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Funding

This work was supported by Office of the Assistant Secretary of Defense for Health Affairs through the Neurotoxin Exposure Treatment Parkinson's Research Program under Award No. W81XWH- 16-1-0768. Opinions, interpretations, conclusions, and recommendations are those of the author and are not necessarily endorsed by the Department of Defense.

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Authors and Affiliations

Authors

Contributions

Conception and design of the study: MJB. Data collection: DSH, JB, JLF, SAS, BBS, MBH, TJD. Data analysis: WAD, JB, JLF, JP, TJD, MJB. Writing of the first draft: WAD. Manuscript revisions: WAD, DSH, JB, JLF, SAS, BBS, MBH, TJD, MJB.

Corresponding author

Correspondence to W. Alex Dalrymple.

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Conflicts of interest

The authors declare that there are no conflicts of interest relevant to this work.

Consent to participate

Informed consent was not required for this study as it was retrospective in nature and all identifying information was removed.

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The authors certify that this manuscript is an original work, has not been previously published, and is not under consideration for publication in another journal at this time.

Ethical approval

This work was approved by the Institutional Review Board at the University of Virginia. Given the retrospective nature of the work and the fact that all patient information was de-identified, informed patient consent was not necessary for this work. All authors confirm that we have read the Journal’s position on issues involved in ethical publication and affirm that this work is consistent with those guidelines.

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Dalrymple, W.A., Huss, D.S., Blair, J. et al. Cholinergic nucleus 4 atrophy and gait impairment in Parkinson’s disease. J Neurol 268, 95–101 (2021). https://doi.org/10.1007/s00415-020-10111-2

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  • DOI: https://doi.org/10.1007/s00415-020-10111-2

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