Intraoperative seizures occurrence in cortical mapping of eloquent areas
- Authors: Toporkova O.A.1, Aleksandrov M.V.1, Tastanbekov M.M.1
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Affiliations:
- Russian Research Neurosurgical Institute named after prof. A.L. Polenov (branch of the V.A. Almazov National Medical Research Center)
- Issue: Vol 23, No 2 (2021)
- Pages: 39-44
- Section: Clinical trials
- URL: https://journals.rcsi.science/1682-7392/article/view/61268
- DOI: https://doi.org/10.17816/brmma61268
- ID: 61268
Cite item
Abstract
The effect of structural epilepsy on the frequency of intraoperative convulsive seizures is assessed when mapping functionally significant areas of the cerebral cortex during resection of intracerebral neoplasms. The work is based on the analysis of the results of intraoperative neurophysiological studies at the Polenov Neurosurgical Institute. For the period 2019–2020 87 intraoperative mappings of eloquent cortex were carried out during resections of intracerebral neoplasms: 79 mappings of the motor cortex and 16 mappings of auditory-speech areas during operations with awakening. When mapping the motor zones of the cortex, the frequency of seizures was 5.1%, while mapping the auditory-speech zones with awakening — 18.75%. The division of cases of intraoperative convulsive seizures into two groups: seizures arising from motor mapping and seizures associated with the mapping of auditory zones — reflects differences in factors that affect the excitability of the cerebral cortex. In motor mapping, stimulation occurs against the background of general anesthesia, unlike waking operations. The intensity of stimulation in auditory mapping is higher than in motor mapping in motor mapping. Formally, the current used in motor mapping is significantly higher than in mapping auditory zones. In general, with the development of intraoperative convulsive seizures, the current intensity of cortical stimulation does not exceed the average values required to stimulate functionally significant cortical zones. The presence of epileptic syndrome in patients with intracerebral tumors cannot be considered as a predictor of intraoperative seizure development when performing motor mapping under general anesthesia as well as during surgery with awakening for mapping of motor or auditory verbal zones.
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##article.viewOnOriginalSite##About the authors
Olga A. Toporkova
Russian Research Neurosurgical Institute named after prof. A.L. Polenov (branch of the V.A. Almazov National Medical Research Center)
Author for correspondence.
Email: fata-morgana0@yandex.ru
SPIN-code: 7368-9186
diagnostician
Russian Federation, Saint PetersburgMikhail V. Aleksandrov
Russian Research Neurosurgical Institute named after prof. A.L. Polenov (branch of the V.A. Almazov National Medical Research Center)
Email: mdoktor@yandex.ru
ORCID iD: 0000-0002-9935-3249
SPIN-code: 5452-8634
Scopus Author ID: 7004578812
http://www.almazovcentre.ru/?page_id=64071
doctor of medical sciences, professor
Russian Federation, Saint PetersburgMalik M. Tastanbekov
Russian Research Neurosurgical Institute named after prof. A.L. Polenov (branch of the V.A. Almazov National Medical Research Center)
Email: m.m.tastanbekov@gmail.com
SPIN-code: 1822-0196
Scopus Author ID: 14819785400
doctor of medical sciences
Russian Federation, Saint PetersburgReferences
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