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Related Experiment Videos

Changes in cortical excitability with thalamic deep brain stimulation.

G F Molnar1, A Sailer, C A Gunraj

  • 1Division of Neurology, Krembil Neuroscience Centre, Toronto Western Research Institute, University Health Network, University of Toronto, Toronto, Ontario, Canada.

Neurology
|June 16, 2005
PubMed
Summary
This summary is machine-generated.

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Deep brain stimulation (DBS) for essential tremor activates, rather than inhibits, the ventralis intermedius (VIM) nucleus. This finding, supported by motor evoked potential amplitude, clarifies the mechanism of action for this movement disorder treatment.

Area of Science:

  • Neuroscience
  • Neurosurgery
  • Movement Disorders

Background:

  • Deep brain stimulation (DBS) is a recognized treatment for movement disorders, yet its precise mechanism remains unclear.
  • Both lesioning and DBS of the ventralis intermedius (VIM) nucleus of the thalamus alleviate essential tremor.
  • Emerging evidence suggests DBS may activate, not inhibit, targeted neurons.

Purpose of the Study:

  • To investigate whether thalamic DBS activates the target area in patients experiencing essential tremor.
  • To test the hypothesis of neuronal activation during DBS for essential tremor.

Main Methods:

  • Seven unmedicated essential tremor patients with VIM implants and 11 healthy controls underwent transcranial magnetic stimulation (TMS).
  • Cortical excitability was assessed via motor evoked potentials (MEPs) during DBS ON, HALF frequency, and OFF conditions.

Related Experiment Videos

  • MEP recruitment curves were analyzed across varying TMS intensities.

    • Main Results:

    • Essential tremor scores improved significantly with DBS ON.
    • A significant interaction between DBS condition and TMS intensity affected MEP amplitudes.
    • DBS ON resulted in higher MEP amplitudes at high TMS intensities compared to controls.

    Conclusions:

    • The VIM nucleus projects directly to the motor cortex.
    • Elevated motor evoked potential amplitudes during VIM DBS suggest activation of the target area.
    • This study supports the hypothesis that VIM DBS activates neurons in essential tremor patients.