Emerging Deep Brain Stimulation Targets in the Cerebellum for Tremor

Area of Science:

• Neuroscience
• Neurosurgery
• Movement Disorders

Background:

• Deep brain stimulation (DBS) effectively treats essential tremor but shows limited efficacy for tremors with ataxia or dystonia.
• Conventional DBS targets are insufficient for complex tremor types, necessitating exploration of alternative approaches.

Purpose of the Study:

• To review clinical experience and preclinical data on cerebellar DBS for tremor treatment.
• To identify optimal targets, stimulation parameters, and indications for cerebellar DBS in various tremor disorders.

Main Methods:

• Systematic review of published clinical case reports and preclinical/human physiology studies.
• Analysis of four tremor types treated with cerebellar DBS: essential tremor, post-stroke tremor, dystonic tremor, and cerebellar ataxia-associated tremor.

Main Results:

• The dentate nucleus is a common cerebellar DBS target, but details on targeting and laterality are often lacking.
• Conflicting evidence exists regarding the laterality of cerebellar DBS effects and optimal target selection.
• Preclinical and interventional studies suggest potential benefits, but further rigorous investigation is required.

Conclusions:

• Cerebellar DBS is an emerging approach for refractory tremors, particularly those with associated ataxia or dystonia.
• Uncertainty remains regarding optimal anatomical targets, laterality, and patient selection for cerebellar DBS.
• Well-designed, larger-scale studies are crucial to establish the efficacy and refine the application of cerebellar DBS for tremor management.