Subthalamic nucleus deep brain stimulation and associations with attention and processing speed in Parkinson's disease
Clinical Snapshot
PICO Framework
| P — Population | Parkinson's disease patients (n=37): 20 with STN-DBS and 17 with medical therapy |
| I — Intervention | Subthalamic nucleus deep brain stimulation (STN-DBS) |
| C — Comparator | Medical therapy alone |
| O — Outcomes | Attention and processing speed measured by P300 event-related potentials, Stroop test, and Serial Digit Learning Test |
Bottom Line
This small cross-sectional study suggests STN-DBS may be associated with improved attention and processing speed in Parkinson's disease patients, as measured by shorter P300 latencies and better Stroop test performance. However, the study's limitations significantly constrain clinical interpretation. The lack of confounder adjustment, small sample size, and cross-sectional design prevent determination of causality. Patients with DBS may have differed systematically from the medical therapy group in disease characteristics, baseline cognition, or other factors. While the multimodal assessment approach is methodologically sound, the clinical significance of the observed differences remains unclear without effect size data. These preliminary findings warrant larger, longitudinal studies with proper baseline assessments and confounder control before informing clinical decision-making about cognitive outcomes following STN-DBS.
Key Findings
P Value: p = 0.004 for P300 latency; p = 0.03 for Stroop test performance
Effect Size: Not reported
Primary Outcome: P300 latency shorter in DBS group vs medical therapy group
Nnt Or Sensitivity: Not applicable for this observational study design
Confidence Interval: Not provided
Clinical Application
Requires specialized neurophysiology and neuropsychology services for comprehensive cognitive assessment Relevant to Australian movement disorder centres; STN-DBS covered by Medicare for appropriate PD patients; aligns with RACGP guidelines for multidisciplinary PD care Parkinson's disease patients being considered for STN-DBS or currently receiving treatment
Abstract
Although subthalamic nucleus deep brain stimulation (STN DBS) is an effective treatment for the motor symptoms of Parkinson's disease (PD), its effects on cognitive functions are controversial. This cross-sectional study aimed to compare attention and processing speed in PD patients with STN-DBS and those receiving medical therapy, using a multimodal assessment combining P300 event-related potentials and neuropsychological tests. The study included 20 PD patients who underwent STN DBS and 17 PD patients who were followed with medical treatment. Demographic and clinical data for all patients were recorded. Cognitive functions were assessed using the P300 potential, the Stroop test (ST), and the Serial Digit Learning Test (SDLT). P300 potential latency and amplitude values, as well as neuropsychometric test results, were statistically compared between the two groups. P300 latency was shorter in the DBS-treated group than in the non-DBS group (p = 0.004). Performance times on Part III of the ST were shorter in the DBS-treated group (p = 0.03). In addition, a higher proportion of patients in the DBS-treated group performed normally on Part I of the ST compared to the non-DBS group (p = 0.03). There was no significant difference between the two groups in SDLT results. Shorter P300 latency and subtle differences in ST performance suggest a potential association between STN-DBS and the cognitive domains of attention and processing speed. Combining neuropsychological and electrophysiological assessments could provide a more comprehensive evaluation, and future large-scale, longitudinal studies are needed to clarify domain-specific cognitive effects.
References
- 1.Das Pektezel, L., Panpalli Ates, M., Comoglu, S. S., & Ulker, A. C. (2026). Subthalamic nucleus deep brain stimulation and associations with attention and processing speed in Parkinson's disease. Experimental Brain Research. https://doi.org/10.1080/14737175.2024.2360121
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