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- W858466031 abstract "OBJECTIVE: To record bedside SSEP from intracranial electrodesBACKGROUND: SSEP is an established neurophysiologic technique for identifying the primary somatosensory pathway recorded from surface electrodes or directly from a cortical grid during intraoperative neuromonitoring under general anesthesia. Direct recording of SSEP from intracranial electrodes in awake patients has rarely been described in the literature.DESIGN/METHODS: This was an observational study to record bedside direct cortical SSEP in awake patients without sedation. Four medically refractory localization-related epilepsy patients had suspected seizure onset zones in the frontoparietal or parietal lobe and underwent electroencephalogram (EEG) monitoring with implanted with intracranial electrodes. The median nerve and posterior tibial nerve were stimulated at 6.0-18.0 milliamps and 200 trials were averaged. The low cut filter was 30 Hertz (Hz) and the high cut filter was 3000Hz. Intracranial electrodes were referenced to a scalp electrode (Fz).RESULTS: Upper extremity SSEP were recorded directly from intracranial electrodes from all four cases with reproducible N20 latencies [18.1 - 21.4 milliseconds (ms)] and amplitudes [2.21 -21.04 microvolts (uV)]. Lower extremity SSEP were recorded in 2/4 patients with P37 latencies [37.5-40.0ms] and amplitudes [2.5-41.33uV]. A phase reversal was recorded from one patient; the other three patients did not have electrodes overlying primary motor cortex. All patients could perceive non-painful peripheral stimulation and they tolerated the procedure well. One patient had reflex sensory epilepsy and had two of his typical simple partial seizures between SSEP stimulations. After monitoring, two patients underwent focal resection and one patient had a responsive neurostimulator implanted. One patient is planning to have responsive neurostimulation implanted.CONCLUSIONS: Direct cortical bedside SSEP may be helpful in pre-surgical brain mapping for refractory epilepsy patients with seizure onset zones near the somatosensory cortex. Concurrent intracranial EEG will be analyzed for somatosensory induced band activity and its relationship to voluntary movements. Disclosure: Dr. Le has nothing to disclose. Dr. Parvizi has nothing to disclose. Dr. Meador has received personal compensation for activities on behalf the Epilepsy Study Consortium with Eisai Inc., NeuroPace, Inc., Novartis, Supernus, Upsher-Smith Laboratories, UCB Pharma, and Vivus Pharmaceuticals as a consultant. Dr. Meador has rec" @default.
- W858466031 created "2016-06-24" @default.
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- W858466031 date "2015-04-06" @default.
- W858466031 modified "2023-09-23" @default.
- W858466031 title "Reproducible direct cortical somatosensory evoked potentials (SSEP) recorded at bedside in epilepsy patients (P2.079)" @default.
- W858466031 hasPublicationYear "2015" @default.
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