Pulse duration settings in subthalamic stimulation for Parkinson's disease

Area of Science:

• Neurology
• Neurosurgery
• Biomedical Engineering

Background:

• Deep brain stimulation (DBS) is a key therapy for Parkinson's disease (PD).
• Optimal stimulation parameters for subthalamic nucleus (STN) DBS are not well-established due to limited double-blind studies.
• The CUSTOM-DBS study addresses the need for evidence-based recommendations on DBS settings.

Purpose of the Study:

• To compare the efficacy and safety of two different pulse durations in subthalamic nucleus DBS for Parkinson's disease.
• To determine the optimal stimulation settings for improved therapeutic window and reduced side effects in PD patients undergoing DBS.

Main Methods:

• A randomized controlled trial involving 15 Parkinson's disease patients undergoing subthalamic nucleus DBS.
• Patients were programmed with either a 30µs (test) or 60µs (control) pulse width.
• Efficacy (UPDRS III scores) and side-effect thresholds were measured in a medication-off state to determine the therapeutic window.

Main Results:

• The therapeutic window was significantly larger with a 30µs pulse width compared to 60µs (P=0.0009).
• Motor symptom improvement (UPDRS III scores) was non-inferior between the 30µs and 60µs pulse durations (P=0.00008).

Conclusions:

• Subthalamic nucleus DBS at 30µs pulse width is equally effective for motor symptoms in Parkinson's disease compared to 60µs.
• A shorter pulse width (30µs) offers improved energy efficiency and a lower risk of stimulation-induced side effects, supporting its use in clinical practice.