Theoretical Evaluation of a Parietal Trajectory for Subthalamic Deep Brain Stimulation

Area of Science:

• Neurosurgery
• Computational Neuroscience
• Biophysics

Background:

• The subthalamic region is a critical hub for motor control, integrating numerous axonal pathways.
• Current deep brain stimulation (DBS) approaches for Parkinson's disease (PD) face limitations in co-activating key motor pathways like cerebellothalamic (CT), motor hyperdirect (mHD), and pallidothalamic (PT).

Purpose of the Study:

• To evaluate the theoretical efficacy of a novel parietal DBS lead trajectory for activating multiple motor pathways in the subthalamic region.
• To compare the pathway activation potential of a parietal trajectory against a traditional frontal DBS lead.

Main Methods:

• Utilized advanced biophysical DBS models within the CIT168 human atlas and Petersen axonal pathway models.
• Compared a standard 8-contact frontal directional DBS lead with a 16-contact parietal directional DBS lead.

Main Results:

• Axonal pathways (PT, mHD, CT) exhibit an anterior-to-posterior distribution in the subthalamic white matter.
• Frontal trajectories are limited in multi-pathway activation due to dorsal-ventral contact alignment.
• Parietal trajectories offer enhanced opportunities for activating all target pathways while avoiding the internal capsule.

Conclusions:

• Parietal DBS trajectories present a viable alternative for pathway-targeted stimulation in Parkinson's disease.
• This approach warrants further consideration as pathway-specific stimulation moves into clinical practice for PD therapy.