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Spinal cord stimulation therapy for gait dysfunction in progressive supranuclear palsy patients

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Abstract

Background

There are no effective symptomatic treatments for progressive supranuclear palsy (PSP). Recent studies report benefits of spinal cord stimulation (SCS) for freezing of gait (FOG) and gait disorders in Parkinson’s disease and atypical Parkinsonism patients. This is the first study to report therapeutic effects of SCS in Richardson’s syndrome PSP (PSP-RS) patients.

Methods

Epidural SCS was implanted in three female PSP-RS participants (3.2 ± 1.3 years with disease). Six programs (300–400 µs/30–130 Hz) were randomly tested at suprathreshold intensity on separate days. The setting that best improved gait/FOG was used daily by each participant in the study. Protokinetics walkway captured spatiotemporal gait measures and FOG episodes (turning on the spot and while walking) and clinical scales including FOG questionnaire, UPDRS-III (OFF-/ON-l-dopa), and participant-perceived global impression of change (GISC) were collected at pre-SCS, and 3, 6, 12 months post-SCS.

Results

Participant #1 demonstrated the highest GISC score (6.5/10) with a consistent reduction of FOGs by 43.8%, UPDRS-III score (− 5 points), and improved step length and stride velocity (33.6%) while maintaining a l-dopa response of ~ 12% over the 12 months. Participant #2, walking FOG frequency and turning duration was reduced by 39.0% (OFF-l-dopa), and ON-l-dopa UPDRS-III score worsened (+ 5 points) at 12 months. Participant #3, FOG frequency reduced by 75% up to 6 months rating a GISC 3/10 score, however disease severity worsened at 12 months. Ambulatory gait parameters universally improved by 29.6% in all participants.

Conclusion

The results support the benefit of SCS for FOG and gait symptoms in PSP-RS and suggests early SCS intervention for dopaminergic-resistant gait should be considered.

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Acknowledgements

We acknowledge the contribution by the participants and by the research personnel and volunteer staff at the National Parkinson Foundation Centre of Excellence, London Movement Disorder Centre, located in the London Health Sciences Centre, London, Ontario, Canada. We also extend recognition to the neurosurgical team of Dr. Andrew Parrent in the planning and coordination of this study at University Hospital, London Health Sciences Centre.

Funding

There are no financial disclosures to report for the conduct of this study.

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Authors and Affiliations

Authors

Contributions

OS: conceptualization, methodology, software, formal analysis, investigation, resources, data curation, writing (original), writing (editing and review), visualization, project administration. AP: conceptualization, methodology, investigation, resources, project administration. MJ: conceptualization, methodology, investigation, resources, writing (editing and review), project administration.

Corresponding author

Correspondence to Mandar Jog.

Ethics declarations

Conflict of interest

Dr. Jog is a scientific advisor and receives research financial support from the following companies: AbbVie, Allergan Inc., Boston Scientific, Ipsen, MDDT Inc., Medtronic, Merz Pharma, Novartis, and Teva Pharmaceuticals. Dr. Parrent and Ms. Samotus report no conflict of interests.

Ethical approval

The study reported in this manuscript has been approved by the Western University Health Sciences Research Ethics Board (REB) and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All persons gave their informed consent prior to their inclusion in the study. Details that might disclose the identity of the subjects under study were omitted.

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Samotus, O., Parrent, A. & Jog, M. Spinal cord stimulation therapy for gait dysfunction in progressive supranuclear palsy patients. J Neurol 268, 989–996 (2021). https://doi.org/10.1007/s00415-020-10233-7

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  • DOI: https://doi.org/10.1007/s00415-020-10233-7

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