Long‐Term follow‐up of globus pallidus chronic stimulation in advanced Parkinson's disease

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. © 2002 Movement Disorder Society