NCT00148889

Double-blind, Multicenter Study to Assess the Efficacy of Bilateral Pallidal Stimulation in Patients With Medically Refractory Primary Cervical Dystonia

Prospective,Randomised, Double-blind, Multicenter Study to Assess the Efficacy and Safety of Bilateral Globus Pallidus Internus - in Patients With Medically Refractory Primary Cervical Dystonia

• Status: Completed
• Phase: Phase 3
• Study type: Interventional
• Enrollment: 63 (actual)
• Sponsor: German Parkinson Study Group (GPS) · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

The purpose of this study is to investigate the efficacy and safety of bilateral pallidal stimulation in patients with medically refractory primary cervical dystonia.

Detailed description

Primary cervical dystonia (CD) affects about 20-40/100.000 population. The disease is chronic and life-long. The therapy of choice are local intramuscular Botulinum Toxin injections given every three months. Oral medication such as anticholinergics or dopamine depleting drugs are usually of limited efficacy or their use is limited by intolerable side-effects. About 5-10% of CD patients develop neutralizing antibodies against Botulinum Toxin. Two previous controlled multicenter trials have shown the efficacy and safety of bilateral pallidal stimulation in patients with primary segmental and generalized dystonia (one study was performed by our group). Following surgery, patients will be randomized 1:1 to verum or placebo stimulation for a period of three months. Primary outcome measure is the TWSTRS (Toronto Western Spasmodic Torticollis Rating Scale) - a validated and widely accepted physician-based outcome measure for cervical dystonia. The independent TWSTRS raters are movement disorders specialists unaware of the stimulation status (verum/placebo) and they compare the TWSTRS-score at baseline and 3-months follow-up. Our hypothesis is that stimulated patients will have a significantly better improvement of dystonia as compared to those without stimulation (placebo group). After the 3-months period, all patients are unblinded and receive continuous effective stimulation by the implanted system. Regular follow-up visits are scheduled every 12 months for 5 years postoperatively to assess the long-term efficacy of pallidal stimulation. Side-effects are assessed in a standardized way and include the assessment of surgery-induced as well as stimulation-induced side-effects.

Conditions

• Cervical Dystonia

Interventions

Type	Name	Description
DEVICE	Deep brain stimulation (DBS)	Bilateral pallidal stimulation with an implanted DBS device

Timeline

• Start date: 2005-07-01
• Primary completion: 2008-04-01
• Completion: 2008-04-01
• First posted: 2005-09-08
• Last updated: 2018-02-19

Locations

10 sites across 2 countries: Austria, Germany