Globus pallidal deep brain stimulation for Tourette syndrome: Effects on cognitive function

Area of Science:

• Neuroscience
• Neurosurgery
• Psychiatry

Background:

• Tourette syndrome (TS) is a complex neurological disorder characterized by motor and vocal tics.
• Refractory TS cases often require advanced interventions when standard treatments fail.
• Deep brain stimulation (DBS) is an emerging therapy for severe, treatment-resistant TS.

Purpose of the Study:

• To evaluate the impact of bilateral deep brain stimulation of the anteromedial globus pallidus internus (GPiam-DBS) on cognitive function in patients with refractory Tourette syndrome.
• To determine if GPiam-DBS affects memory, executive function, attention, or other cognitive domains in TS patients.
• To assess potential adverse cognitive effects of GPiam-DBS in the context of tic reduction.

Main Methods:

• A double-blind randomized crossover trial involving 11 patients with refractory Tourette syndrome.
• Cognitive assessments including tests for memory, executive function, and attention were conducted at baseline and during periods of GPiam-DBS ON and OFF.
• Standardized neuropsychological tests such as the California Verbal Learning Test-II and Trail-making Test were utilized.

Main Results:

• GPiam-DBS did not result in significant global cognitive changes.
• Verbal episodic memory and set-shifting showed improvement when GPiam-DBS was OFF compared to baseline.
• No significant differences in cognitive test performance were observed between GPiam-DBS ON and OFF conditions.

Conclusions:

• GPiam-DBS does not appear to induce cognitive deficits in patients with Tourette syndrome.
• The findings support the safety of GPiam-DBS concerning cognitive function in refractory TS.
• Further research can explore the nuanced effects of GPiam-DBS on specific cognitive domains in TS.