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Stereotact Funct Neurosurg 1999 Apr;72(2-4):170-173 Subthalamic Stimulation in Parkinson's Disease. preliminary results. Levesque MF, Taylor S, Rogers R, Le MT, Swope D Cedars-Sinai Medical Center, Functional Neurosurgery Unit, Los Angeles, Calif., USA. Objectives: We wanted to evaluate chronic subthalamic nucleus (STN) stimulation as an alternative to pallidotomy for severe Parkinson's disease symptomatology. Methods: Nine patients met clinical criteria for unilateral standard pallidotomy. All had severe medically refractory drug-induced dyskinesia and had reached maximal daily levodopa therapy. Pre- and postoperative videos, neuropsychometric testings and clinical stagings were administered. Three patients were selected to undergo stereotactic implantation of a deep brain stimulator (DBS) after Institutional Review Board approval and informed consent. These were performed using digitized microrecordings. The other group received unilateral pallidotomy. Results: At a mean follow-up of 6 months, our results support recent findings of significant major improvement in motor scores, activity of daily living and decrease in amount of daily levodopa intake by close to 50% after 3 months of stimulation. Conclusions: Chronic stimulation of the STN appears to provide significant motor improvement in patients with severe Parkinson's disease and is more beneficial than pallidotomy.