Dual Pallidal and Thalamic Deep Brain Stimulation for Complex Ipsilateral Dystonia

Area of Science:

• Neurosurgery
• Neurology
• Movement Disorders

Background:

• Globus pallidus pars interna (GPi) is a recognized target for deep brain stimulation (DBS) in dystonia.
• Targeting the ventralis oralis (Vo) complex has shown promise for dystonic tremor and focal dystonia.
• Multi-target DBS may offer advantages over single-target DBS for dystonia.

Purpose of the Study:

• To evaluate the clinical outcomes of unilateral DBS targeting both the GPi and Vo in patients with medically refractory upper extremity dystonia.
• To compare the efficacy of dual-target DBS with single-target DBS.

Main Methods:

• Five patients with focal or segmental upper extremity dystonia underwent unilateral DBS.
• Two DBS electrodes were implanted targeting the ipsilateral GPi and Vo.
• Clinical outcomes were assessed using the Burke-Fahn-Marsden Dystonia Rating Scale (BFMDRS) and Disability Rating Scale.

Main Results:

• BFMDRS scores showed sustained improvement, decreasing by up to 64% at 12 months.
• Disability Rating Scale scores improved by up to 60% at 12 months.
• Stimulating both GPi and Vo targets at 1 month post-surgery yielded better clinical scores than single-target stimulation.

Conclusions:

• Unilateral dual electrode DBS targeting both the thalamus (Vo) and globus pallidus (GPi) appears effective for dystonia.
• This dual-target approach may be as effective or superior to single-target DBS for dystonia.
• Favorable clinical outcomes were observed despite a small patient cohort.