Bilateral pallidal neurostimulation for 3 months was more effective than sham stimulation in patients with primary generalized or segmental dystonia. (ClinicalTrials.gov number, NCT00142259 [ClinicalTrials.gov].).

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In five patients with medically refractory tardive dystonia, continuous bilateral high-frequency stimulation of the globus pallidus internus was associated with a rapid (within 12 to 72 hours) and substantial (mean 87%, 10.7 SD of the motor part of the Burke-Fahn-Marsden Dystonia Rating Scale) improvement of dystonia and functional disability without adverse events.

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