title: Return of bradykinesia after subthalamic stimulation ceases: relationship to electrode location.
abstract: In 20 subjects we quantified the rate at which subthalamic nucleus deep brain stimulation effects on Parkinson's bradykinesia "washed-out" after stimulation ceased. We found that wash-out was a two-step process, consisting of an initial fast decrease in stimulation's therapeutic effect, followed by a further, slow decline. Moreover, the relative contribution of the fast and slow components differed between patients. Finally, we found that lateral stimulation caused more of the fast-decaying component, while medial stimulation caused more of the slow-decaying component. This implies the existence of at least two separate mechanisms by which subthalamic nucleus deep brain stimulation improves bradykinesia, associated with activation of spatially separate zones in the vicinity of the subthalamic nucleus.
authors: Department of Neurology, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195, USA. coopers2@ccf.org
authors: Scott Evan
authors: SE
authors: Cooper
authors: Angela Marie
authors: AM
authors: Noecker
authors: Hesham
authors: H
authors: Abboud
authors: Jerrold Lee
authors: JL
authors: Vitek
authors: Cameron Charles
authors: CC
authors: McIntyre
mesh_terms: D000368:Aged; D046690:Deep Brain Stimulation; D004567:Electrodes, Implanted; D006801:Humans; D018476:Hypokinesia / Q000503:physiopathology / Q000628:therapy*; D008875:Middle Aged; D010300:Parkinson Disease / Q000503:physiopathology / Q000628:therapy*; D020531:Subthalamic Nucleus / Q000503:physiopathology*