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Central pain modulation after subthalamic nucleus stimulation: A crossover randomized trial.

Ana Marques1, Olivier Chassin, Dominique Morand

  • 1Neurology Department, CHU Clermont-Ferrand; University Clermont 1, CH Vichy, Vichy, France. ar_marques@chu-clemontferrand.fr

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Summary

Subthalamic nuclei deep brain stimulation (STN-DBS) and levodopa significantly increase pain and tolerance thresholds in Parkinson disease patients. This suggests STN-DBS may directly modulate central pain perception.

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Area of Science:

  • Neuroscience
  • Neurology
  • Pain Medicine

Background:

  • Parkinson disease (PD) often involves non-motor symptoms, including chronic pain.
  • The mechanisms underlying pain in PD and the effects of treatments like subthalamic nuclei deep brain stimulation (STN-DBS) and levodopa on pain perception are not fully understood.

Purpose of the Study:

  • To investigate the acute effects of STN-DBS and levodopa on pain and tolerance thresholds in PD patients.
  • To determine if STN-DBS influences pain perception through central or peripheral mechanisms.

Main Methods:

  • A double-blind, randomized, crossover study involving 19 PD patients.
  • Evaluation of thermal and mechanical pain thresholds under three conditions: STN-DBS on/medication off, STN-DBS off/medication on, and STN-DBS off/medication off.
  • Retrospective analysis of prospectively recorded clinical data (UPDRS, Hoehn and Yahr stage, levodopa dosage, tapping test).

Main Results:

  • Both acute STN-DBS and acute levodopa administration significantly increased mechanical pain and tolerance thresholds.
  • No significant correlation was found between pain improvement and motor symptom improvement (UPDRS-III) after levodopa or STN-DBS.
  • No correlation between postoperative pain improvement and mechanical pain threshold modification was observed.

Conclusions:

  • Clinical pain relief following STN-DBS in PD patients is not solely due to improved motor function.
  • STN-DBS may directly modulate pain perception centrally by increasing mechanical pain and tolerance thresholds.