Selecting the Most Effective DBS Contact in Essential Tremor Patients Based on Individual Tractography

Area of Science:

• Neurosurgery
• Neurology
• Medical Imaging

Background:

• Postoperative selection of optimal deep brain stimulation (DBS) contacts for essential tremor (ET) currently involves extensive clinical testing.
• Previous research indicates a correlation between DBS contact effectiveness and proximity to the dentatorubrothalamic tract (DRTT).

Purpose of the Study:

• To investigate if calculating stimulation overlap with the individual DRTT can predict the most effective DBS contact in ET patients.
• To explore a potential method for reducing the duration and complexity of clinical testing for DBS lead optimization.

Main Methods:

• Retrospective analysis of seven ET patients undergoing bilateral thalamic DBS.
• Assessment of tremor control for each contact at a 2mA stimulation level.
• Identification of individual DRTTs using diffusion tensor imaging (DTI) and correlation with clinical effectiveness based on DRTT overlap.

Main Results:

• The DBS contact with the highest or second-highest DRTT overlap corresponded to the best clinical effect in 92.9% of leads analyzed.
• DRTT overlap accounted for 26.7% of the variance in clinical outcomes at the group level (p < 0.001).

Conclusions:

• Individual DRTT tractography and stimulation overlap can serve as a predictive marker for identifying effective DBS contacts in ET.
• This approach may significantly reduce the need for prolonged clinical testing, streamlining the optimization of DBS therapy for essential tremor.