Abstract
Background
Deep brain stimulation (DBS) of the subthalamic nucleus (STN) reduces tremor, rigidity, and akinesia. According to the literature, the dentato-rubro-thalamic tract (DRTt) is verified target for DBS in essential tremor; however, its role in the treatment of Parkinson’s disease is only vaguely described. The aim of our study was to identify the relationship between symptom alleviation in PD patients and the distance of the DBS electrode electric field (EF) to the DRTt.
Methods
A single-center retrospective analysis of patients (N = 30) with idiopathic Parkinson’s disease (PD) who underwent DBS between November 2018 and January 2020 was performed. DRTt and STN were visualized using diffusion-weighted imaging (DWI) and tractography protocol of magnetic resonance (MR). The EF was calculated and compared with STN and course of DRTt. Evaluation of patients before and after surgery was performed with use of UPDRS-III scale. The association between distance from EF to DRTt and clinical outcomes was examined. To confirm the anatomical variation between DRTt and STN observed in tractography, white matter dissection was performed with the Klingler technique on ten human brains.
Results
Patients with EF overlapping STN and DRTt benefited from significant motor symptoms improvement. Anatomical findings confirmed the presence of population differences in variability of the DRTt course and were consistent with the DRTt visualized by MR.
Conclusions
DRTt proximity to STN, the main target in PD DBS surgery, confirmed by DWI with tractography protocol of MR combined with proper predefined stimulation parameters may improve efficacy of DBS-STN.
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Data availability
Raw data are presented in the manuscript and in the supplementary materials.
Abbreviations
- DBS:
-
Deep brain stimulation
- STN:
-
Subthalamic nucleus
- DRTt:
-
Dentato-rubro-thalamic tract
- PD:
-
Parkinson’s disease
- EF:
-
Electric field
- MR:
-
Magnetic resonance
- DWI:
-
Diffusion-weighted imaging
- FCT:
-
Fasciculus cerebellothalamicus
- RN:
-
Red nucleus
- ROI:
-
Region of interest
- DN:
-
Dentate nucleus
- MCP:
-
Middle cerebellar peduncle
- SCP:
-
Superior cerebellar peduncle
- VTA:
-
Volume tissue activated
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Conceptualization—Karol Wiśniewski. Methodology—Karol Wiśniewski, Agata Gajos, Andreas Fahlström. Analysis—Karol Wiśniewski, Agata Gajos, Andrzej Bogucki, Michał Grzegorczyk, Michael G. Brandel. Investigation—Karol Wiśniewski, Karol Zaczkowski, Agata Szulia, Michał Grzegorczyk, Agnieszka Dąbkowska, Andreas Fahlström, Ernest J. Bobeff, Rafał Wójcik, Katarzyna Kwiecień. Writing—original draft preparation—Karol Wiśniewski, Karol Zaczkowski, Agata Szulia, Agata Gajos, Andreas Fahlström, Ernest Jan Bobeff, Michael G. Brandel. Writing—review and editing—Karol Wiśniewski, Agata Gajos, Andrzej Bogucki, Bogdan Ciszek, Dariusz J. Jaskólski. Project administration—Karol Wiśniewski. Supervision—Karol Wiśniewski, Agata Gajos, Andrzej Bogucki, Bogdan Ciszek, Dariusz J. Jaskólski. All authors reviewed the manuscript.
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Comments
The authors of this paper did a Herculean job trying to find an explanation for different effects of STN DBS on tremor control in Parkinson disease patients—by correlating the stimulated regions with the course of the dentate-rubro-thalamic tract. In addition to deep radiographic analysis of their own clinical cohort, the authors performed a thorough literature search and completed a sophisticated anatomical study, confirming the variability of the tract's location and the distance between the tract and STN.
Despite inherent subjectivity of the tractographic imaging and unclear reliability of the fiber dissection in brains of unaffected subjects, one has to wonder if the authors' findings explain tremendous variability in degree of individual response to rather standard and decades-old neurosurgical procedure where stimulation of clearly identifiable target may or may not require additional refinement based on the patient's response. Such variability once again underscores the value of physiological (rather than solely radiographic or anatomical) targeting—at least until more reliable indicators for proper targeting are established.
I applaud the authors for the thoroughness of their investigation and look forward to seeing more data to support their findings and postulates.
Konstantin Slavin,
Chicago, USA
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Wiśniewski, K., Gajos, A., Zaczkowski, K. et al. Overlapping stimulation of subthalamic nucleus and dentato-rubro-thalamic tract in Parkinson’s disease after deep brain stimulation. Acta Neurochir 166, 106 (2024). https://doi.org/10.1007/s00701-024-06006-0
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DOI: https://doi.org/10.1007/s00701-024-06006-0