Surgical Timing of Deep Brain Stimulation Determines Cognitive Risk in GBA1-Associated Parkinson’s Disease

Article Impact Level: HIGH
Data Quality: STRONG
Summary of  Movement Disorders https://doi.org/10.1002/mds.70520
Dr. Evridiki Asimakidou et al.

Points

Researchers across ten international centers analyzed three hundred forty three Parkinson patients to evaluate how deep brain stimulation timing alters cognitive trajectories in GBA1 mutation carriers.
Multi center data demonstrated that late stage subthalamic neurostimulation in GBA1 carriers significantly accelerated cognitive decline while early intervention effectively preserved executive function and memory sharpness.
Longitudinal analysis identified a critical seven to eight year window following diagnosis where deep brain stimulation maximizes motor relief while delaying onset of cognitive deterioration.
Comparative evaluation confirmed that surgical timing did not impact cognitive trajectories in non carrier Parkinson patients establishing genetic status as the primary determinant of surgical risk.
Authors concluded that early genetic screening enables personalized surgical timelines that optimize long term motor improvement and cognitive preservation in high risk Parkinson disease populations.

Summary

This study evaluated the impact of surgical timing on long-term cognitive trajectories in Parkinson’s disease (PD) patients carrying mutations in the GBA1 gene undergoing subthalamic nucleus deep brain stimulation (STN-DBS). Published in Movement Disorders by an international consortium co-led by researchers at Hackensack Meridian Neuroscience Institute at JFK University Medical Center, the study addressed clinical debates regarding whether GBA1-associated cognitive decline is accelerated by neurosurgery or reflects natural disease progression. The research sought to establish whether early surgical intervention preserves cognitive function while optimizing motor outcomes in this genetically vulnerable population.

The multi-center retrospective cohort study analyzed longitudinal cognitive data from 343 PD patients treated across 10 medical centers in the United States and Europe, comparing outcomes between GBA1 mutation carriers (GBA-PD) and non-carriers according to disease duration at the time of STN-DBS implantation. Comparative trajectory modeling demonstrated that GBA-PD patients receiving STN-DBS in later stages of disease experienced a significantly accelerated rate of cognitive decline compared to those operated on earlier. Conversely, surgical timing had no significant impact on cognitive trajectories among non-carrier PD controls. Quantitative analysis defined a critical therapeutic window within the first seven to eight years following initial PD diagnosis, during which STN-DBS intervention effectively extended motor improvement while delaying the onset of significant executive and memory impairment.

The authors conclude that GBA1 mutation status and surgical timing interact directly to influence post-DBS cognitive trajectories in Parkinson’s disease. Rather than serving as a contraindication for neuromodulation, GBA1 variant status emphasizes the necessity of early genetic testing to guide personalized surgical decision-making. Intervening within the optimal seven-to-eight-year post-diagnosis window allows clinicians to maximize motor relief while safeguarding cognitive reserve in high-risk patients.

Link to the article: https://movementdisorders.onlinelibrary.wiley.com/doi/10.1002/mds.70520

References

Asimakidou, E., Avenali, M., Aasly, J. O., Afshari, M., Alcalay, R. N., Anderson, S., Artusi, C. A., Bernard, B., Bozzali, M., Bressman, S., Calandra‐Buonaura, G., Cavallieri, F., Cilia, R., Corvol, J., Cocco, A., De Bie, R. M. A., Ehrlich, D., Eleopra, R., Foltynie, T., … PARKNET Study Group. (2026). Timing of Deep Brain Stimulation and Cognitive Trajectories in GBA1 ‐Associated Parkinson’s Disease. Movement Disorders, mds.70520. https://doi.org/10.1002/mds.70520