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Updated: Jun 23, 2026
Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation
Published on: July 16, 2014
Lateralized Subthalamic Stimulation for Axial Dysfunction in Parkinson's Disease: A Randomized Trial
Karlo J Lizárraga1,2, Bhairavei Gnanamanogaran1,3, Tameem M Al-Ozzi3,4,5
1The Edmond J. Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, University Hospital Network and Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada.
Background:
Patients with Parkinson's disease might develop treatment-resistant axial dysfunction after bilateral subthalamic stimulation.
Objectives:
To study whether lateralized stimulation (unilateral 50% amplitude reduction) for ≥21 days results in ≥0.13 m/s faster gait velocity in the dopaminergic ON state in these patients, and its effects on motor and axial function, quantitative gait and speech measures, quality of life, and selected cognitive tasks.
Methods:
Randomized, double-blinded, double-crossover trial.
Results:
In 22 participants (51-79 years old, 15 women), there were no significant changes in gait velocity, quality of life, cognitive, and speech measures. Reducing left-sided amplitude resulted in a 2.5-point improvement in axial motor Movement Disorder Society Unified Parkinson's Disease Rating Scale (MDS-UPDRS) (P = 0.005, uncorrected) and a 1.9-point improvement in the Freezing of Gait Questionnaire (P = 0.024, uncorrected).
Conclusions:
Lateralized subthalamic stimulation does not result in meaningful improvement in gait velocity in patients with Parkinson's disease who develop treatment-resistant axial dysfunction after bilateral subthalamic stimulation. Left subthalamic overstimulation may contribute to axial deterioration in these patients. © 2022 International Parkinson and Movement Disorder Society.
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