Deep Brain Stimulation: When to Test Directional?

Area of Science:

• Neurosurgery
• Neurology
• Biomedical Engineering

Background:

• Directional deep brain stimulation (DBS) offers precise control over the stimulation field.
• Current methods for directional steering require extensive and time-consuming contact testing.
• Determining when directional current steering is most advantageous is crucial for efficient programming.

Purpose of the Study:

• To evaluate the benefit of directional current steering in Parkinson's disease patients.
• To develop a predictive model for identifying contacts that benefit from directional stimulation.
• To optimize the programming process for directional DBS.

Main Methods:

• Fifty-two Parkinson's disease patients with STN directional DBS underwent standardized monopolar programming.
• Individual contacts were tested to assess the advantage of directional stimulation.
• A prediction model was developed to identify contacts suitable for directional steering.

Main Results:

• No significant average difference in therapeutic window between ring-level and best directional contacts.
• 66% of patients and 35% of contacts showed a larger therapeutic window with directional stimulation.
• Directional steering benefit was predicted with 79% sensitivity and 57% specificity.

Conclusions:

• Directional stimulation can offer a larger therapeutic window for a significant portion of patients.
• A predictive model can identify contacts likely to benefit from directional steering.
• Selective testing of contacts with a narrow therapeutic window (<2.0 mA) can streamline DBS programming.