title: Chronic inhibition of the subthalamic nucleus in Parkinson's disease.
abstract: Deep brain stimulation (DBS) of the subthalamic nucleus (STN) has become a popular treatment option for patients suffering from severe Parkinson's disease (PD). Yet the long-term outcome of subthalamic DBS is unknown. A total of 27 patients suffering from severe PD underwent bilateral stereotactic implantation of high-frequency stimulators in the STN. Before surgery and at least annually after surgery they were examined with the Unified Parkinson's Disease Rating Scale (UPDRS). This study presents the results of a mean 30 months (range 23 to 55) follow-up of these patients. We found stable and significant off medication improvement of motor function by DBS (between 40% and 44% in the UPDRS part III). While on medication there was no significant change in the motor function by DBS. UPDRS part III worsened gradually during the follow-up period, suggesting disease progression. Thirty months postsurgery the UPDRS part II (ADL) was still improved by 17%. There was a lasting decrease in fluctuations by more than 50%, and dyskinesias were reduced by about 70%. Freezing was reduced significantly from 2.2 in the UPDRS part II to 1.2 at the endpoint. The daily levodopa-equivalent dose was reduced by 39% at 12 months and by 30% at 30 months after STN stimulator implantation. Subthalamic DBS improves sustainable motor function in patients with severe Parkinson's disease and leads to a lasting reduction of medication. Limitations of this procedure were found for disturbances of speech and swallowing.
authors.affiliation: Department of Neurology, University of Heidelberg, INF 400, 69120 Heidelberg, Germany. martin_krause@med.uni-heidelberg.de
authors.forename: Martin
authors.initials: M
authors.lastname: Krause
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Fogel
authors.forename: Petra
authors.initials: P
authors.lastname: Mayer
authors.forename: Manja
authors.initials: M
authors.lastname: Kloss
authors.forename: Volker
authors.initials: V
authors.lastname: Tronnier
mesh_terms: D000328:Adult; D000368:Aged; D004599:Electric Stimulation Therapy / Q000009:adverse effects / Q000379:methods*; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D009043:Motor Activity; D009433:Neural Inhibition; D010300:Parkinson Disease / Q000503:physiopathology* / Q000628:therapy*; D020531:Subthalamic Nucleus / Q000503:physiopathology*; D016896:Treatment Outcome