Co-occurrence of high-frequency oscillations and delayed responses evoked by intracranial electrical stimulation in stereo-EEG studies |
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Authors: | Cristian Donos Ioana Mîndruţă Mihai Dragoş Malîia Alin Raşină Jean Ciurea Andrei Barborica |
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Affiliation: | 1. Physics Department, University of Bucharest, Str. Atomistilor 405, Magurele, Jud. Ilfov CP MG-11, Bucharest-Magurele, Romania;2. Epilepsy Center, University Hospital of Freiburg, Breisacher Str. 64, Freiburg, Germany;3. Neurology Department, University Emergency Hospital, Splaiul Independentei 169, Bucharest, Romania;4. Neurology Department, Carol Davila University of Medicine and Pharmacy, Blvd. Eroii Sanitari 8, Bucharest, Romania;5. Department of Neurosurgery, Bagdasar-Arseni Emergency Hospital, ?os. Berceni 12, Bucharest, Romania;6. FHC Inc, 1201 Main St, Bowdoin, ME, USA |
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Abstract: | ObjectiveTo perform a side-by-side comparison of two epileptogenicity biomarkers, high frequency oscillations (HFOs) and delayed responses (DRs), as a result of single-pulse electrical stimulation.MethodsWe have recorded stimulation-evoked HFOs and DRs in 16 epileptic patients undergoing presurgical evaluation using the stereoelectroencephalographic method. To evaluate converging and complementary information provided by the biomarkers, we analyzed them individually and for logical “and”/“or” combinations between them. 3D maps of the biomarkers’ distributions by recording location (inbound maps) and by stimulation location (outbound maps) were created to analyze their relationship with the epileptogenic structures.ResultsHFOs occur less frequently than DRs, by 18.7%, when counting by recording contacts, and more frequently, by 7.4%, when counting by stimulation contacts. 40.6% of the contacts exhibiting HFOs also exhibit DRs, and 44.1% of the contacts exhibiting DRs also exhibit HFOs. When combining biomarkers, there was a tradeoff between increased seizure onset zone (SOZ) sensitivity, from 21.3% to 73%, and decreased specificity, from 87.2% to 34.3%.ConclusionsThere is a moderate similarity in the information provided by the DRs and HFOs.SignificanceThe biomarkers complement each other, but there is a tradeoff between different metrics for SOZ localization. |
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Keywords: | Single pulse electrical stimulation High-frequency oscillations Delayed responses Epilepsy biomarkers Seizure onset zone Drug resistant epilepsy |
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