Role of ictal baseline shifts and ictal high‐frequency oscillations in stereo‐electroencephalography analysis of mesial temporal lobe seizures

Summary Objective To assess the role of ictal baseline shifts (IBS) and ictal high‐frequency oscillations (iHFOs) in intracranial electroencephalography (EEG) presurgical evaluation by analysis of the spatial and temporal relationship of IBS, iHFOs with ictal conventional stereo‐electroencephalograp...

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Bibliographic Details
Published in:Epilepsia (Copenhagen) 2014-05, Vol.55 (5), p.690-698
Main Authors: Wu, Shasha, Kunhi Veedu, Hari Prasad, Lhatoo, Samden D., Koubeissi, Mohamad Z., Miller, Jonathan P., Lüders, Hans O.
Format: Article
Language:English
Subjects:
Adult
Amygdala - physiopathology
Amygdala - surgery
Anterior Temporal Lobectomy
Brain Mapping
DC shifts
Depth intracranial monitoring
Dominance, Cerebral - physiology
Electrodes, Implanted
Electroencephalography - methods
Epilepsy, Temporal Lobe - diagnosis
Epilepsy, Temporal Lobe - physiopathology
Epilepsy, Temporal Lobe - surgery
Evoked Potentials - physiology
Fast ripples
Female
Fluorodeoxyglucose F18
Hippocampus - pathology
Hippocampus - physiopathology
Hippocampus - surgery
Humans
Infraslow activity
Magnetic Resonance Imaging
Male
Middle Aged
Neuropsychological Tests
Positron-Emission Tomography
Postoperative Complications - diagnosis
Postoperative Complications - physiopathology
Retrospective Studies
Ripples
Sclerosis
Signal Processing, Computer-Assisted
Temporal Lobe - physiopathology
Temporal Lobe - surgery
Tomography, X-Ray Computed
Young Adult
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Summary:Summary Objective To assess the role of ictal baseline shifts (IBS) and ictal high‐frequency oscillations (iHFOs) in intracranial electroencephalography (EEG) presurgical evaluation by analysis of the spatial and temporal relationship of IBS, iHFOs with ictal conventional stereo‐electroencephalography (icEEG) in mesial temporal lobe seizures (MTLS). Methods We studied 15 adult patients with medically refractory MTLS who underwent monitoring with depth electrodes. Seventy‐five ictal EEG recordings at 1,000 Hz sampling rate were studied. Visual comparison of icEEG, IBS, and iHFOs were performed using Nihon‐Kohden Neurofax systems (acquisition range 0.016–300 Hz). Each recorded ictal EEG was analyzed with settings appropriate for displaying icEEG, IBS, and iHFOs. Results IBS and iHFOs were observed in all patients and in 91% and 81% of intracranial seizures, respectively. IBS occurred before (22%), at (57%), or after (21%) icEEG onset. In contrast, iHFOs occurred at (30%) or after (70%) icEEG onset. The onset of iHFOs was 11.5 s later than IBS onset (p 
ISSN:0013-9580
1528-1167
DOI:10.1111/epi.12608