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Neurohistopathological Findings at the Electrode-Tissue Interface in Long-Term Deep Brain Stimulation: Systematic Literature Review, Case Report, and Assessment of Stimulation Threshold Safety.
MedLine Citation:
PMID:  24947418     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVES: Despite the widespread use of deep brain stimulation (DBS) in the treatment of neurologic disorders for over a quarter of a century, there has not been a systematic review and analyses of cases in which long-term postmortem clinic-pathologic data have been collected demonstrating the effects of chronically implanted electrodes and electrical stimulation on human brain tissue. Our objective is to provide a comprehensive systematic review of the literature on clinicopathologic findings of DBS tissue-electrode interface (TEI) and to determine types and prevalences of neuropathological findings among electrode materials and stimulation parameters and to augment this with previously unpublished histopathological data, images, and analyses from a DBS case implanted for 12 years, providing the longest duration histopathological follow-up.
MATERIALS AND METHODS: A Medline literature review identified DBS cases upon which postmortem clinicopathologic follow-up was performed with adequate characterization of TEI. Direct follow-up with authors augmented this with unpublished data and neuropathological details.
RESULTS: We identified 40 cases, mean age 59.1 ± 13.0 (range: 21-88) years, involving 58 implanted DBS electrodes. The mean postmortem histopathological follow-up of the implanted DBS electrodes was 22.2 ± 29.2 (range: 0.067-146) months, including our case with a 12-year follow-up. The following histological changes were identified: fibrous sheaths (5-25 μm thickness) surrounding the electrode (94%), fibrillary gliosis (73%), reactive astrocytes (78%), multinucleated giant cells (75%), mononuclear leukocytes (92%), and macrophages (91%). Microglial activation (60%), axonal spheroids (64%), and neuronal loss (60%) were less common and absent at 12-year follow-up in the index case. This is seventh case reporting T cell presence at the TEI.
CONCLUSIONS: Neuropathological findings from published cases and our 12-year follow-up index case confirm the long-term safety of neuromodulation and stimulation thresholds and demonstrate persistence of T cells and occasional subclinical focal tissue injury.
Authors:
Daniel J DiLorenzo; Joseph Jankovic; Richard K Simpson; Hidehiro Takei; Suzanne Z Powell
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-6-20
Journal Detail:
Title:  Neuromodulation : journal of the International Neuromodulation Society     Volume:  -     ISSN:  1525-1403     ISO Abbreviation:  Neuromodulation     Publication Date:  2014 Jun 
Date Detail:
Created Date:  2014-6-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9804159     Medline TA:  Neuromodulation     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2014 International Neuromodulation Society.
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