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August 2020; 10 (4) Research

Deep brain stimulation for orthostatic tremor

A single-center case series

Angela L. Hewitt, Bryan T. Klassen, Kendall H. Lee, Jamie J. Van Gompel, Anhar Hassan
First published September 19, 2019, DOI: https://doi.org/10.1212/CPJ.0000000000000730
Angela L. Hewitt
Department of Neurology (ALH, BTK, AH) and Department of Neurosurgery (KHL, JVG), Mayo Clinic, Rochester, MN.
MD, PhD
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Bryan T. Klassen
Department of Neurology (ALH, BTK, AH) and Department of Neurosurgery (KHL, JVG), Mayo Clinic, Rochester, MN.
MD
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Kendall H. Lee
Department of Neurology (ALH, BTK, AH) and Department of Neurosurgery (KHL, JVG), Mayo Clinic, Rochester, MN.
MD, PhD
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Jamie J. Van Gompel
Department of Neurology (ALH, BTK, AH) and Department of Neurosurgery (KHL, JVG), Mayo Clinic, Rochester, MN.
MD
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Anhar Hassan
Department of Neurology (ALH, BTK, AH) and Department of Neurosurgery (KHL, JVG), Mayo Clinic, Rochester, MN.
MBBCh, FRACP
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Citation
Deep brain stimulation for orthostatic tremor
A single-center case series
Angela L. Hewitt, Bryan T. Klassen, Kendall H. Lee, Jamie J. Van Gompel, Anhar Hassan
Neurol Clin Pract Aug 2020, 10 (4) 324-332; DOI: 10.1212/CPJ.0000000000000730

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Abstract

Background Orthostatic tremor (OT) is a high-frequency weight-bearing tremor of the legs and trunk associated with progressive disability and is often refractory to medications. Case reports suggest that thalamic deep brain stimulation (DBS) is effective. We report 5 female patients with medication-refractory OT who underwent bilateral thalamic DBS at the Mayo Clinic and assess factors associated with a successful DBS outcome.

Methods Demographic, clinical, electrophysiology, and DBS data were abstracted. Outcomes were change in tremor-onset latency, standing time, standing ADLs, and patient and clinician global impression of change (PGIC; CGIC).

Results All 5 patients had improved standing time (72 vs 408 seconds, p ≤ 0.001) and improved standing ADLs after surgery, without change in tremor-onset latency (16 vs 75 seconds, p = 0.14). Maximal benefit was reached up to 3 years after surgery and sustained for up to 6 years. CGIC was “much improved” in all; PGIC was “much improved” in 4 and “minimally improved” in 1. There were no major complications. Postoperative electrophysiology (n = 1) showed lower tremor amplitude and slower tremor ramp-up on vs off stimulation.

Conclusions Bilateral thalamic DBS improved OT symptoms with benefit lasting up to 6 years. A modest increase in standing time of several minutes was associated with meaningful improvement in standing ADLs. Microlesional effect and bilateral stimulation are likely favorable features, while baseline standing time of several minutes may be unfavorable. These findings may inform clinician and patient counseling and require confirmation in larger studies.

Footnotes

  • Funding information and disclosures are provided at the end of the article. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp.

  • Received June 21, 2018.
  • Accepted August 13, 2019.
  • © 2019 American Academy of Neurology
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