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Area of Science:

  • Neurosurgery
  • Neurology
  • Movement Disorders

Background:

  • Deep brain stimulation (DBS) targeting the thalamic ventral intermediate nucleus (VIM) is a standard treatment for suppressing arm tremor.
  • Uncontrolled studies suggest that DBS of the posterior subthalamic area (PSA) may offer superior tremor control.

Purpose of the Study:

  • To compare the intra-individual efficacy of VIM-DBS versus PSA-DBS for tremor suppression and arm function.
  • To evaluate the effectiveness of two distinct deep brain stimulation targets in a randomized, controlled setting.

Main Methods:

  • A randomized, double-blind, crossover trial was conducted with 45 patients (18-80 years) experiencing action tremor.
  • Patients received DBS leads implanted to target both VIM and PSA, with subsequent randomization to VIM-first or PSA-first stimulation periods.
  • The primary endpoint measured the difference in tremor score improvement on the Fahn-Tolosa-Marin Tremor Rating Scale (FTMTRS) for the dominant arm.

Main Results:

  • The per-protocol analysis of 40 patients revealed a statistically significant mean difference of -2.65 points (p=0.002) in FTMTRS score improvement, favoring PSA stimulation.
  • PSA stimulation demonstrated significantly superior tremor suppression compared to VIM stimulation, particularly in the second stimulation period.
  • A potential post-surgery stun effect was noted, contributing to tremor reduction in both groups during the initial three months.

Conclusions:

  • Posterior subthalamic area (PSA) deep brain stimulation provides superior tremor suppression compared to ventral intermediate nucleus (VIM) stimulation.
  • The findings support PSA as a potentially more effective target for deep brain stimulation in managing tremor.
  • Further research may elucidate the long-term efficacy and optimal parameters for PSA-DBS.