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Measures of impulsivity in Parkinson's disease decrease after DBS in the setting of stable dopamine therapy.

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Deep brain stimulation (DBS) for Parkinson's disease may improve impulse control disorders (ICDs) even without reducing medication. While DBS shows promise for altering impulsive behavior, new ICDs can emerge post-surgery.

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Area of Science:

  • Neurology
  • Neurosurgery
  • Psychiatry

Background:

  • Deep brain stimulation (DBS) is increasingly recognized for its potential to modulate impulse control.
  • Impulse control disorders (ICDs) are a significant concern in Parkinson's disease (PD) management.
  • The interplay between DBS targets (STN, GPi) and ICDs requires further investigation, especially with conservative medication strategies.

Purpose of the Study:

  • To prospectively assess the impact of subthalamic nucleus (STN) and globus pallidus internus (GPi) DBS on ICDs.
  • To evaluate these effects within a framework of conservative dopamine reduction.
  • To determine if DBS itself influences impulsive behaviors independent of medication changes.

Main Methods:

  • A cohort of 37 patients undergoing unilateral STN or GPi DBS for PD was studied.
  • Patients were assessed pre-operatively and 6-12 months post-operatively for ICDs using the Questionnaire for Impulsivity in Parkinson's disease (QUIP) and clinical interviews.
  • Levodopa Equivalent Daily Dose (LEDD) was monitored to assess medication changes.

Main Results:

  • Post-operative LEDD did not significantly differ from pre-operative levels, indicating a stable medication strategy.
  • Mean QUIP scores significantly decreased post-operatively, suggesting overall improvement in impulse control.
  • Patients with pre-existing ICDs showed significant QUIP score reduction, though 4 new cases emerged post-operatively, and one worsened.

Conclusions:

  • STN or GPi DBS may improve ICD symptoms in PD patients even when medication levels (LEDD) remain stable.
  • The findings suggest that the direct effects of DBS on brain circuitry play a crucial role in modulating impulsive behavior.
  • While generally beneficial, DBS can also lead to the emergence or worsening of ICDs in a subset of patients.