Transcutaneous vagus nerve stimulation for Parkinson's disease: a systematic review and meta-analysis
Author: Jiatong Shan#1,2,3, Zehong Li#4, Minxiu Ji5, Miao Zhang5, Caidi Zhang6, Yikang Zhu6, Zhen Feng7
Affiliation:
1 Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
2 Centre for Healthy Longevity, @AgeSingapore, National University Health System, Singapore, Singapore.
3 New York University Shanghai, Shanghai, China.
4 Nanchang University Queen Mary School, Nanchang, Jiangxi, China.
5 Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
6 Shanghai Key Laboratory of Psychotic Disorders, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
7 Affiliated Rehabilitation Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, China.
Conference/Journal: Front Aging Neurosci
Date published: 2025 Jan 14
Other:
Volume ID: 16 , Pages: 1498176 , Special Notes: doi: 10.3389/fnagi.2024.1498176. , Word Count: 273
Background:
Transcutaneous vagus nerve stimulation (tVNS) has emerged as a novel noninvasive adjunct therapy for advanced Parkinson's disease (PD), yet no quantitative analysis had been conducted to assess its therapeutic effect.
Objectives:
This review aimed to investigate the efficacy of tVNS on motor function, other potential clinical targets and its safety in various treatment conditions.
Methods:
We searched six databases for randomized controlled trials (RCTs) that involved treating PD patients with tVNS. Primary outcome was motor functions, including severity of motor signs, functional mobility and balance, and gait parameters. Secondary outcomes were cognition, emotion, sleep related impairments, patient reported non-motor outcomes, and any adverse events. All outcomes were classified and analyzed according to the treatment duration and medication condition of an included study. Risk of bias was evaluated by referencing Cochrane risk of bias tool 1.0. Data was analyzed by Revman 5.4.
Results:
6 RCTs with 176 PD patient were included. Several motor functions and non-motor functions measured during on-medication condition (severity of motor signs -0.48 [95% CI -0.93, -0.04], gait -0.48 [95% CI -0.85, -0.1], patients reported non-motor outcomes -0.4 [95% CI -0.78, -0.03]), improved significantly. However, verbal fluency, sleep-related impairment, and fatigue were negatively impacted by tVNS during on-medication condition. No distinct adverse events were reported.
Conclusion:
tVNS is a relatively safe adjunct treatment for PD. It has small to moderate therapeutic effects on motor functions and may negatively impact on a few other outcomes. Quality level of the evidence is low and further research is warranted.
Systematic review registration:
https://www.crd.york.ac.uk/prospero/#recordDetails, identifier CRD42024503322 (PROSPERO).
Keywords: Parkinson’s disease; cognition; meta-analysis; motor functions; transcutaneous vagus nerve stimulation.
PMID: 39877075 PMCID: PMC11772336 DOI: 10.3389/fnagi.2024.1498176
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