Abstract
Background
Deep brain stimulation (DBS) is a well-established treatment for Parkinson’s disease (PD). While the success of DBS is dependent on careful patient selection and accurate lead placement, programming parameters play a pivotal role in tailoring therapy on the individual level. Various algorithms have been developed to streamline the initial programming process, but the relationship between pre-operative patient characteristics and post-operative device settings is unclear. In this study, we investigated how PD severity correlates with DBS settings.
Methods
We conducted a retrospective review of PD patients who underwent DBS of the subthalamic nucleus at one US tertiary care center between 2014 and 2018. Pre-operative patient characteristics and post-operative programming data at various intervals were collected. Disease severity was measured using the Unified Parkinson’s Disease Rating Scale score (UPDRS) as well as levodopa equivalent dose (LED). Correlation analyses were conducted looking for associations between pre-operative disease severity and post-operative programming parameters.
Results
Fifty-six patients were analyzed. There was no correlation between disease severity and any of the corresponding programming parameters. Pre-operative UPDRS scores on medication were similar to post-operative scores with DBS. Settings of amplitude, frequency, and pulse width increased significantly from 1 to 6 months post-operatively. Stimulation volume, inferred by the distance between contacts used, also increased significantly over time.
Conclusions
Interestingly, we found that patients with more advanced disease responded to electrical stimulation similarly to patients with less advanced disease. These data provide foundational knowledge of DBS programming parameters used in a single cohort of PD patients over time.
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Abbreviations
- DBS:
-
Deep brain stimulation
- PD:
-
Parkinson’s disease
- UPDRS:
-
Unified Parkinson’s Disease Rating Scale
- LED:
-
Levodopa equivalent dose
- STN:
-
Subthalamic nucleus
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Drs. Girgis and Shahlaie designed and conducted the study. Dr. Zhang, Ms. Sardo, Ms. Sperry, and Mr. Ovruchesky collected data. Drs. Saez and Far performed statistical analyses. Dr. Far prepared the manuscript with important intellectual input from the other authors. All authors approved the final manuscript.
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Comments
The authors of this study analyzed the programming settings in a large single-center cohort of Parkinson’s disease patients treated with subthalamic nucleus (STN) deep brain stimulation (DBS). Despite common stereotype that more severe symptoms require higher stimulation settings, the authors discovered that the correlation between disease severity and stimulation settings is lacking; although the settings were increased during initial 6 months after the implantation, they subsequently plateaued for the duration of follow-up.
Based on review of the presented data, one may wonder if the explanation is more complex than it appears and the real reason for this lack of correlation is the progressive atrophy of the stimulated targets (that may require less electricity to be suppressed), or gradual normalization of stimulated networks that develops over time (and therefore maintains stable stimulation response despite disease progression), or some other mechanism that is yet to be elucidated.
Nevertheless, I applaud the authors for their thorough analysis and want to encourage them and others to maintain critical thinking in processing the wealth of patients’ data in prospective fashion. It is, indeed, conceivable that, similar to recent developments in spinal cord stimulation arena, we will come up to a conclusion that “less is more” and that settings need to be reduced rather than raised when the symptoms change with disease progression.
Konstantin Slavin.
Chicago, USA.
This article is part of the Topical Collection on Functional Neurosurgery—Movement disorders
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Far, R., Saez, I., Sardo, A. et al. Subthalamic nucleus deep brain stimulation programming settings do not correlate with Parkinson’s disease severity. Acta Neurochir 164, 2271–2278 (2022). https://doi.org/10.1007/s00701-022-05279-7
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DOI: https://doi.org/10.1007/s00701-022-05279-7