Deep Brain Stimulation in Movement Disorders Sample Clauses

Deep Brain Stimulation in Movement Disorders. Surgical intervention is indicated when symptoms of movement disorders can no longer be adequately managed with medications. Surgical methods for suppressing movement disorders target specific nuclei within the basal ganglia and require precise access to relatively small deep brain structures where open surgical access is largely impractical. The surgical aim is to alter function by localized lesioning or, more recently, electrical stimulation. The latter has the advantages of being non-permanent, adjustable and reversible. Subthalamic deep brain stimulation for Xxxxxxxxx’x disease is based on the finding that neuronal activity in the STN is abnormal in the Parkinsonian state (14). The degree of improvement as a result of DBS can be predicted by the degree of improvement produced by oral levodopa (15). Globus pallidus deep brain stimulation for dystonia is based on empiric evidence of efficacy (16), although recent evidence of abnormal oscillatory activity in the GPI in dystonia provides some physiologic rationale for the therapy (17,18). DBS for idiopathic primary dystonia is expected to produce at least a 50% improvement In BFMDRS scores (18). Deep brain stimulation systems consist of an electrode, which is precisely placed in the brain, a subcutaneous extender lead, and an implanted pulse generator (IPG), which is usually placed subclavicularly. The DBS electrodes that are currently commercially available (Medtronic, Minneapolis, MN) have 4 independent electrical contacts that are separated by 1.5 mm or 0.5 mm. The IPG is a programmable unit that can activate any of the contacts in the DBS electrode with varying degrees of electrical stimulation. IPG’s are tuned to provide optimal therapeutic benefit and this may be adjusted on an ongoing basis.
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