Supplementary motor area stimulation for Parkinson disease: a randomized controlled study

Area of Science:

• Neurology
• Neuroscience
• Medical Devices

Background:

• Parkinson disease (PD) is a progressive neurodegenerative disorder affecting motor control.
• Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive brain stimulation technique.
• The supplementary motor area (SMA) plays a crucial role in motor planning and execution.

Purpose of the Study:

• To investigate the efficacy of rTMS over the SMA in Parkinson disease patients.
• To determine the effect of different stimulation frequencies (1-Hz vs. 10-Hz) on PD symptoms.
• To assess the long-term effects of rTMS up to 20 weeks.

Main Methods:

• A randomized, double-blind, sham-controlled, multicenter study with 106 PD participants.
• Participants received 8 weekly sessions of either 1-Hz rTMS, 10-Hz rTMS, or sham stimulation.
• Primary outcome: change in Unified Parkinson's Disease Rating Scale (UPDRS) part III scores.

Main Results:

• 1-Hz rTMS demonstrated a significant improvement in UPDRS part III scores (6.84 points) at 20 weeks.
• 10-Hz rTMS and sham stimulation showed transient motor symptom improvement.
• No significant changes were observed in non-motor symptoms across all groups.

Conclusions:

• Low-frequency (1-Hz) rTMS over the SMA is effective for improving motor symptoms in Parkinson disease.
• High-frequency (10-Hz) rTMS and sham stimulation offer only temporary benefits.
• rTMS over the SMA does not appear to impact non-motor symptoms in PD.