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Subthalamic nucleus stimulation modulates motor cortex oscillatory activity in Parkinson's disease
D Devos1, E Labyt, P Derambure
1Department of Neurology, Lille University Medical Center, France. d-devos@chru-lille.fr
Brain : a Journal of Neurology
|December 24, 2003
Summary
Subthalamic nucleus (STN) stimulation and l-dopa improve motor control in Parkinson's disease by normalizing brain activity patterns. This combined treatment offers the greatest improvement in motor function and cortical activity.
Area of Science:
- Neuroscience
- Neurology
- Movement Disorders
Background:
- Parkinson's disease (PD) is characterized by impaired motor preparation, linked to delayed movement-related desynchronization (MRD) in the primary sensorimotor (PSM) cortex.
- Previous research showed internal globus pallidus (GPi) stimulation improved movement execution but not motor preparation.
- Subthalamic nucleus (STN) stimulation has shown potential in reversing abnormal premotor brain activation patterns in PD.
Purpose of the Study:
- To assess changes in premotor and PSM cortex oscillatory activity induced by bilateral STN stimulation, comparing it with l-dopa effects.
- To evaluate the combined effects of STN stimulation and l-dopa on motor preparation and execution in Parkinson's disease patients.
Main Methods:
- Ten Parkinson's disease patients and healthy controls performed self-paced wrist flexions under four conditions: off treatment, STN stimulation only, l-dopa only, and both treatments.
- Movement-related desynchronization (MRD) was monitored to assess changes in cortical oscillatory activity.
- Unified Parkinson's Disease Rating Scale (UPDRS) III scores were used to quantify motor symptom severity.
Main Results:
- Both STN stimulation and l-dopa significantly improved UPDRS III scores by approximately 60%, with a combined improvement of 80%.
- Treatment increased desynchronization latency over central regions and movement desynchronization over bilateral central regions, with maximal effects when combined.
- Desynchronization latency decreased over frontocentral regions across all treatment conditions, and PD patients under treatment showed patterns closer to controls.
Conclusions:
- Bilateral STN stimulation, similar to l-dopa, can alter abnormal cortical oscillatory activity patterns in Parkinson's disease.
- STN stimulation may improve motor preparation and execution by normalizing frontocentral desynchronization and enhancing PSM cortex activity.
- Basal ganglia stimulation can influence cortical reactivity for voluntary movement, highlighting the importance of PSM cortex oscillatory activity in PD.