Bilateral pallidal stimulation improves cervical dystonia for more than a decade

Area of Science:

• Neurology
• Neurosurgery

Background:

• Medically resistant cervical dystonia (CD) is a debilitating condition.
• Deep brain stimulation (DBS) is an established treatment for CD, but long-term outcomes are not well-documented.

Purpose of the Study:

• To assess the impact of pallidal DBS on cervical dystonia (CD) over a 10-year period.
• To evaluate long-term changes in dystonia severity, disability, and pain.

Main Methods:

• A prospective study followed five consecutive patients with severe, medication-resistant CD.
• The Toronto Western Spasmodic Torticollis Rating Scale (TWSTRS) was used to assess outcomes over a mean follow-up of 11.5 years.

Main Results:

• A 53% improvement in total TWSTRS score and a 70.1% improvement in disability score were observed.
• Improvements in CD severity and disability remained stable over the long term.
• Tonic CD patterns showed less response to DBS compared to phasic patterns; pain, mood, and cognition were not significantly affected.

Conclusions:

• Chronic bilateral pallidal stimulation provides sustained improvement in dystonia severity and disability for over a decade in treatment-resistant CD patients.
• Individual patient responses to DBS for CD can vary.