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Stimulus features underlying reduced tremor suppression with temporally patterned deep brain stimulation.

Merrill J Birdno1, Alexis M Kuncel, Alan D Dorval

  • 1Duke Univ., Dept. of Biomedical Engineering, Hudson Hall, Rm. 136, Box 90281, Durham, NC 27708-0281, USA.

Journal of Neurophysiology
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Long pauses in deep brain stimulation (DBS) trains significantly reduce tremor relief effectiveness. This finding clarifies that pauses, not general irregularity, impair DBS efficacy by preventing masking of cerebellar inputs to the thalamus.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering

Background:

  • High-frequency deep brain stimulation (DBS) effectively treats tremor.
  • The precise mechanisms underlying DBS efficacy, particularly concerning stimulation timing, remain unclear.
  • Temporal irregularity in stimulation trains has been linked to reduced effectiveness.

Purpose of the Study:

  • To identify specific characteristics of temporally irregular stimulus trains that diminish their tremor-reducing effects.
  • To differentiate the impact of long pauses, bursts, and general irregularity on DBS effectiveness.
  • To elucidate the neural mechanisms by which DBS suppresses tremor.

Main Methods:

  • Intraoperative postural tremor measurements in eight volunteers under various stimulus train conditions.
  • Isolation and manipulation of specific temporal characteristics (pauses, bursts, irregularity) in stimulation trains.
  • Biophysical computer simulations of thalamic network neuronal responses to experimental stimulus trains.

Main Results:

  • Stimulus trains with pauses were significantly less effective in reducing tremor compared to continuous trains (P < 0.002).
  • No significant differences in tremor reduction were observed between trains with or without bursts, or between irregular and periodic trains.
  • Simulations showed that tremor-suppressing trains also reduced thalamic transmembrane potential fluctuations linked to cerebellar inputs.

Conclusions:

  • Long pauses, rather than temporal irregularity per se, are responsible for the decreased effectiveness of irregular DBS trains.
  • DBS likely suppresses tremor by masking cerebellar burst-driver inputs to the thalamus.
  • Pauses in stimulation disrupt this masking effect, reducing tremor suppression efficacy.
  • Afferent cerebellar fibers in the thalamus are proposed as key targets for effective tremor suppression via DBS.