Abstract
To assess the long-term follow-up of the globus pallidus internus (GPi) stimulation, six patients were evaluated every year by using the Unified Parkinson's Disease Rating Scale (UPDRS). Three years postoperatively, GPi stimulation led to a significant improvement of dyskinesia severity (50%, P = 0.05) and activities of daily living (subscore of quality of life scale, 9%, P = 0.05). However, the improvement induced by chronic pallidal stimulation on the mean daily duration in the off state was lost at the last assessment.
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