Engaging dystonia networks with subthalamic stimulation

Area of Science:

• Neuroscience
• Neurosurgery
• Movement Disorders

Background:

• Deep brain stimulation (DBS) is an established treatment for dystonia.
• The internal pallidum is a common target, but the subthalamic nucleus (STN) is increasingly investigated.
• Optimal targeting within the STN and its surrounding structures for diverse dystonia types requires further study.

Purpose of the Study:

• To investigate the neural substrates underlying the efficacy of STN-DBS for different dystonia symptoms.
• To identify optimal stimulation sites and associated functional networks for treating cervical dystonia versus limb dystonia and blepharospasm.

Main Methods:

• Analysis of a multi-center cohort of 58 isolated dystonia patients receiving STN-DBS.
• Correlation of stimulation site locations with symptom improvement (appendicular, cervical, blepharospasm).
• Examination of structural connectivity and functional network involvement.

Main Results:

• Stimulation of the ventral oral posterior nucleus of the thalamus improved cervical dystonia.
• Dorsolateral STN stimulation improved limb dystonia and blepharospasm.
• Distinct structural and functional network connectivities were associated with improvements in different dystonia types.

Conclusions:

• Different dystonia symptoms are modulated by distinct neural networks and require specific DBS targeting.
• Cervical dystonia responds to cerebello-thalamo-cortical circuit modulation, including thalamic stimulation.
• Limb dystonia and blepharospasm benefit from basal ganglia and STN circuitry modulation, including motor cortex projections.
• Findings can guide patient-specific DBS programming for dystonia.