Motor Cortex Neurostimulation Technologies for Chronic Post-stroke Pain: Implications of Tissue Damage on Stimulation Currents
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O'Brien-2016-Motor Cortex Neurostimulation Tec.pdf
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1.56 MB
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Author(s)
O’Brien, Anthony T.
Amorim, Rivadavio
Rushmore, R. Jarrett
Eden, Uri
Afifi, Linda
Dipietro, Laura
Valero-Cabré, Antoni
Wagner, Tim Andrew
Date Issued
November 2016
Journal
Frontiers in Human Neuroscience
Publisher
Frontiers Research Foundation
Citation
O’Brien, Anthony T. et al. “Motor Cortex Neurostimulation Technologies for Chronic Post-Stroke Pain: Implications of Tissue Damage on Stimulation Currents.” Frontiers in Human Neuroscience 10 (2016): n. pag.
Version
Final published version
Abstract
Background: Central post stroke pain (CPSP) is a highly refractory syndrome that can occur after stroke. Primary motor cortex (M1) brain stimulation using epidural brain stimulation (EBS), transcranial magnetic stimulation (TMS), and transcranial direct current stimulation (tDCS) have been explored as potential therapies for CPSP. These techniques have demonstrated variable clinical efficacy. It is hypothesized that changes in the stimulating currents that are caused by stroke-induced changes in brain tissue conductivity limit the efficacy of these techniques.
Methods: We generated MRI-guided finite element models of the current density distributions in the human head and brain with and without chronic focal cortical infarctions during EBS, TMS, and tDCS. We studied the change in the stimulating current density distributions’ magnitude, orientation, and maxima locations between the different models.
Results: Changes in electrical properties at stroke boundaries altered the distribution of stimulation currents in magnitude, location, and orientation. Current density magnitude alterations were larger for the non-invasive techniques (i.e., tDCS and TMS) than for EBS. Nonetheless, the lesion also altered currents during EBS. The spatial shift of peak current density, relative to the size of the stimulation source, was largest for EBS.
Conclusion: In order to maximize therapeutic efficiency, neurostimulation trials need to account for the impact of anatomically disrupted neural tissues on the location, orientation, and magnitude of exogenously applied currents. The relative current-neuronal structure should be considered when planning stimulation treatment, especially across techniques (e.g., using TMS to predict EBS response). We postulate that the effects of altered tissue properties in stroke regions may impact stimulation induced analgesic effects and/or lead to highly variable outcomes during brain stimulation treatments in CPSP.
MIT Department
Harvard University--MIT Division of Health Sciences and Technology
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.3389/fnhum.2016.00545
