1. Language functional MRI and direct cortical stimulation in epilepsy preoperative planning
- Author
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Kareem A. Zaghloul, Richard C. Reynolds, Leigh N. Sepeta, William H. Theodore, John B. Cocjin, Shubhi Agrawal, Sara K. Inati, William D. Gaillard, and Alison Austermuehle
- Subjects
Preoperative planning ,business.industry ,Stimulation ,medicine.disease ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Text mining ,Neurology ,Region of interest ,Language assessment ,Language localisation ,Medicine ,Epilepsy surgery ,Neurology (clinical) ,business ,Neuroscience ,psychological phenomena and processes ,030217 neurology & neurosurgery - Abstract
Objective Presurgical language assessment can help minimize damage to eloquent cortex during resective epilepsy surgery. Two methods for presurgical language mapping are functional MRI (fMRI) and direct cortical stimulation (DCS) of implanted subdural electrodes. We compared fMRI results to DCS to help optimize noninvasive language localization and assess its validity. Methods We studied 19 patients referred for presurgical evaluation of drug-resistant epilepsy. Patients completed four language tasks during preoperative fMRI. After subdural electrode implantation, we used DCS to localize language areas. For each stimulation site, we determined whether language positive electrode pairs intersected with significant fMRI activity clusters for language tasks. Results Sensitivity and specificity depended on electrode region of interest radii and statistical thresholding. For patients with at least one language positive stimulation site, an auditory description decision task provided the best trade-off between sensitivity and specificity. For patients with no language positive stimulation sites, fMRI was a dependable method of excluding eloquent language processing. Interpretation Language fMRI is an effective tool for determining language lateralization before electrode implantation and is especially useful for excluding unexpected critical language areas. It can help guide subdural electrode implantation and narrow the search for eloquent cortical areas by DCS. Ann Neurol 2017;81:526-537.
- Published
- 2017