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Journal Article
Review
Movement disorders induced by deep brain stimulation.
Parkinsonism & related Disorders 2016 April
Deep brain stimulation represents a major advance in the treatment of several types of movement disorders. However, during stimulation new movement disorders may emerge, thus limiting the positive effects of this therapy. These movement disorders may be induced by: 1) stimulation of the targeted nucleus, 2) stimulation of surrounding tracts and nuclei, and 3) as a result of dose adjustment of accompanying medications, such as reduction of dopaminergic drugs in patients with Parkinson's disease. Various dyskinesias, blepharospasm, and apraxia of eyelid opening have been described mainly with subthalamic nucleus stimulation, whereas hypokinesia and freezing of gait have been observed with stimulation of the globus pallidus internus. Other deep brain stimulation-related movement disorders include dyskinesias associated with stimulation of the globus pallidus externus and ataxic gait as a side effect of chronic bilateral stimulation of the ventral intermediate nucleus of thalamus. These movement disorders are generally reversible and usually resolved once the stimulation is reduced or turned off. This, however, typically leads to loss of benefit of the underlying movement disorder which can be re-gained by using different contacts, changing targets or stimulation parameters, and adjusting pharmacological therapy. New and innovative emerging technologies and stimulation techniques may help to prevent or overcome the various deep brain stimulation-induced movement disorders. In this review we aim to describe the clinical features, frequency, pathophysiology, and strategies for treatment of these iatrogenic movement disorders.
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