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Related Experiment Video

Updated: Apr 16, 2026

MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
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Implementing novel trial methods to evaluate surgery for essential tremor.

Jonathan A Hyam1, Erlick A C Pereira, Peter McCulloch

  • 1Department of Neurosurgery, John Radcliffe Hospital , Oxford , UK.

British Journal of Neurosurgery
|March 12, 2015
PubMed
Summary
This summary is machine-generated.

Deep brain stimulation (DBS) provides significant essential tremor (ET) relief, confirmed by Class I evidence. Novel N-of-1 trials and signal-to-noise analysis demonstrate DBS efficacy convincingly.

Keywords:
clinical trials methodology/study designdeep brain stimulationessential tremorthalamuszona incerta

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Area of Science:

  • Neurology
  • Neurosurgery
  • Clinical Trials

Background:

  • Essential tremor (ET) significantly impacts quality of life.
  • Deep brain stimulation (DBS) is a promising treatment for ET.
  • Lack of high-level evidence for DBS efficacy in ET.

Purpose of the Study:

  • To provide Class I evidence for the efficacy of DBS in treating ET.
  • To demonstrate the effectiveness of DBS for essential tremor relief.

Main Methods:

  • Utilized traditional cohort analysis, N-of-1 single-patient randomized controlled trials, and signal-to-noise (S/N) analysis.
  • 20 ET patients with DBS electrodes underwent randomized on/off stimulation periods.
  • Tremor severity was objectively quantified, with patients blinded to stimulation status.

Main Results:

  • Mean tremor severity was significantly lower with DBS on (0.84/10) versus off (6.62/10) (p < 0.0005).
  • N-of-1 trials showed high patient perception accuracy (60% with 12 correct, p=0.001).
  • S/N analysis revealed >80% tremor reduction in 87% of 'On' trials versus 3% of 'Off' trials.

Conclusions:

  • The substantial effect of DBS on ET is too large to be explained by bias.
  • N-of-1 trial design and S/N ratio analysis provide convincing evidence for DBS efficacy in ET.
  • This study establishes Class I evidence for DBS in essential tremor treatment.