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Updated: May 11, 2026
Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation
Published on: July 16, 2014
The microlesion effect is associated with global cognitive impairment and predicts motor outcomes after subthalamic
Liying Liang1, Jiahao Zhao1, Hui Wang1
1Department of Neurology, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, China.
Objective:
A postoperative microlesion effect (MLE) is regarded as a reliable predictor of the subsequent efficacy of deep brain stimulation of the subthalamic nucleus (STN-DBS) treatment. However, the predictive ability of MLE for postoperative motor improvement after DBS surgery in PD patients with global cognitive impairment (GCI) has not been fully explored.
Methods:
This was a prospective, open-label, single-center study with a 6-month follow-up. Patients were divided into three groups based on the MLE response. After separately stratifying by MLE and by global cognitive impairment, we compared postoperative motor symptoms, as assessed by the MDS-UDPRS III, across these strata. To further investigate the impact of global cognitive impairment on long-term postoperative motor outcomes, a mediation analysis was conducted.
Results:
There were 18 patients (40%) classified as the Low MLE group, 19 patients (42.2%) as the Medium MLE group, and 8 patients (17.8%) as the High MLE group. Overall, the interaction effects of Group and Time (P = 0.008) were observed for changes in the MDS-UPDRS III score from baseline. The NC group exhibited a greater improvement compared to the GCI group. Global cognitive impairment was strongly associated with long-term postoperative motor outcomes (P = 0.002), with MLE serving as a mediator (indirect effect = - 0.10, P = 0.042).
Interpretation:
In summary, our study demonstrated that postoperative MLE is common and has strong predictive value for the efficacy of motor symptoms six months after STN-DBS. Additionally, MLE may partially mediate the detrimental effects on motor outcomes caused by global cognitive impairment.
Trial Registry:
CLINICALTRIALS.
Gov Identifier:
NCT06685510.
Insights
Postoperative microlesion effect (MLE) predicts deep brain stimulation (DBS) efficacy in Parkinson's disease (PD) patients. Global cognitive impairment (GCI) negatively impacts motor outcomes, with MLE partially mediating this effect.
Area of Science:
- Neuroscience
- Neurosurgery
- Neurology
Background:
- Deep brain stimulation of the subthalamic nucleus (STN-DBS) is a key treatment for Parkinson's disease (PD).
- The postoperative microlesion effect (MLE) is a known predictor of STN-DBS efficacy.
- The influence of global cognitive impairment (GCI) on the predictive value of MLE for motor outcomes post-STN-DBS remains under-explored.
Purpose of the Study:
- To investigate the predictive ability of MLE for motor improvement after STN-DBS in PD patients.
- To examine the impact of GCI on long-term motor outcomes following STN-DBS.
- To determine if GCI mediates the relationship between MLE and motor outcomes.
Main Methods:
- Prospective, open-label, single-center study with a 6-month follow-up.
- Patients stratified into three groups based on MLE response (Low, Medium, High).
- Comparison of postoperative motor symptoms (MDS-UPDRS III) between MLE strata and cognitive status groups (GCI vs. normal cognition [NC]), with mediation analysis.
Main Results:
- Significant interaction between Group and Time on MDS-UPDRS III scores (P=0.008).
- Normal cognition (NC) group showed greater motor improvement than the GCI group.
- GCI was strongly associated with poorer long-term motor outcomes (P=0.002), with MLE acting as a significant mediator (indirect effect P=0.042).
Conclusions:
- Postoperative MLE is a common finding and a strong predictor of motor symptom efficacy 6 months after STN-DBS.
- MLE may partially mediate the negative impact of GCI on motor outcomes in PD patients undergoing STN-DBS.
- These findings highlight the importance of considering cognitive status when interpreting MLE predictions for STN-DBS outcomes.
