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Bilateral ventral intermediate nucleus thalamic deep brain stimulation in orthostatic tremor

  • Author(s): Coleman, RR
  • Starr, PA
  • Katz, M
  • Glass, GA
  • Volz, M
  • Khandhar, SM
  • Ostrem, JL
  • et al.

Published Web Location

http://www.karger.com/Article/Abstract/444127
No data is associated with this publication.
Abstract

© 2016 S. Karger AG, Basel. Background: Orthostatic tremor (OT) is characterized by high-frequency leg tremor when standing still, resulting in a sense of imbalance, with limited treatment options. Ventral intermediate (Vim) nucleus thalamic deep brain stimulation (DBS) has been reported as beneficial in a few cases. Objective: To report clinical outcomes, lead locations, and stimulation parameters in 2 patients with severe medication-refractory OT treated with Vim DBS. Methods: The patients underwent surface electromyography (EMG) to confirm the OT diagnosis. Outcomes were measured as change in tolerated standing time at the last follow-up. Lead locations were quantified using postoperative MRI. Results: Vim DBS was well tolerated and resulted in improvement in standing time (patient 1: 50 s at baseline to 15 min 16 months after surgery; patient 2: 34 s at baseline to 4.2 min 7 months after surgery). Postoperative surface EMG for patient 1 demonstrated a delayed onset of tremor, lower-amplitude tremor, and periods of quiescence, but an unchanged tremor frequency. Conclusion: These cases provide further support for Vim DBS to improve standing time in severe medication-refractory OT. The location of the effective thalamic target for OT does not differ from the effective target for essential tremor.

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