Optimal Deep Brain Stimulation Locations for Gilles de la Tourette Syndrome.

Area of Science:

• Neurosurgery
• Neurology
• Neuroscience
• Medical Imaging

Background:

• Deep brain stimulation (DBS) is an investigational treatment for severe Gilles de la Tourette Syndrome (GTS).
• Identifying optimal stimulation sites and understanding tic improvement networks are crucial for advancing neuromodulation therapies in GTS.

Purpose of the Study:

• To define optimal deep brain stimulation (DBS) targets for treating severe Gilles de la Tourette Syndrome (GTS).
• To elucidate the specific tic improvement network across different brain targets used in DBS for GTS.

Main Methods:

• A retrospective multi-center cohort study analyzed DBS stimulation locations in patients with GTS across 12 international centers.
• Brain targets included the thalamus, pallidum, and subthalamic nucleus, with a median follow-up of 6 months.
• Voxel-wise sweetspot mapping and anatomical delineations of pallidothalamic and thalamostriatal fibers were employed to interpret response landscapes.

Main Results:

• Tic response maps identified three peaks in the thalamus and pallidum, explaining outcomes in the subthalamic nucleus cohort.
• Response maps correlated with anatomical pathways, including the ansa lenticularis, fasciculus lenticularis, and thalamostriatal projections, explaining 19% of tic improvement variance.
• Obsessive-compulsive behavior response sites showed similarities in the pallidum but distinct, less effective patterns in the thalamus compared to tic responses.

Conclusions:

• Tic reduction targets in deep brain stimulation for GTS align with known structural projections interconnecting the pallidum and thalamus.
• These findings highlight specific anatomical pathways crucial for effective neuromodulation in Tourette Syndrome.