Long-Term Outcomes on Pallidal Neurostimulation for Dystonia: A Controlled, Prospective 10-Year Follow-Up

Area of Science:

• Neurology
• Neurosurgery
• Movement Disorders

Background:

• Pallidal neurostimulation is a recognized treatment for severe isolated dystonia.
• Limited long-term clinical trial data exists for this intervention.

Purpose of the Study:

• To assess the long-term (10-year) efficacy and safety of pallidal neurostimulation.
• To evaluate its impact on motor symptoms, disability, mood, and cognition in patients with isolated generalized or segmental dystonia.

Main Methods:

• A 10-year extension of a prospective, multicenter trial involving 31 patients.
• Utilized the Burke-Fahn-Marsden Dystonia Rating Scale (BFMDRS), Beck Depression Inventory, Beck Anxiety Inventory, and Mattis Dementia Rating Scale for assessments.

Main Results:

• Sustained significant improvement in BFMDRS motor scores (56% improvement) at 10 years compared to baseline.
• 27 out of 31 patients were responders (≥25% improvement).
• Improvements in disability, mood, and anxiety were sustained; cognition remained stable.

Conclusions:

• Pallidal neurostimulation demonstrates sustained efficacy and safety over 10 years for most patients with treatment-refractory dystonia.
• Two-thirds of patients showed significant long-term benefits.
• Approximately one-third experienced treatment failure, highlighting the need for future diagnostic and technological advancements.