Objectives: High-frequency oscillations (HFOs) on intracranial electroencephalography (EEG) recordings have been reported to be useful to identify the epileptogenic zone in intractable epilepsy. We investigated whether the ictal HFOs on scalp EEG seen during spasms contributed to identification of the epileptogenic zone in symptomatic West syndrome (S-WS).
Methods: In S-WS, ictal scalp EEGs were recorded during a series of spasms. The HFOs associated with spasms were visualized in the temporally expanded EEG traces and subjected to time-frequency analysis. The results on the distribution of HFOs were compared with that of cortical lesions indicated by neuroimaging.
Results: In the 4 children examined, HFOs at 80-150 Hz preceded the clinical onsets of spasms. The maximum augmentation of these HFOs was larger than that of HFOs at 20-70 Hz. The regions of the maximum augmentation of HFOs at 80-150 Hz were identical to the lesions detected by neuroimaging. Two patients who underwent dissection of the area including the area with HFOs resulted in Engel class I.
Conclusion: Ictal HFOs of spasms on scalp EEG showed a strong association with neuroimaging abnormalities presumed to be the epileptogenic zone in S-WS. Ictal HFOs can thus be a useful marker for exploring lesions for epilepsy surgery.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.eplepsyres.2012.04.020 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Outcomes following resective and disconnective strategies in the treatment of epileptic spasms: a systematic review of the literature and individual patient data meta-analysis.
Front Neurol
December 2024
Brain and Development Research Axis, Azrieli CHU Ste-Justine Research Center, Montreal, QC, Canada.
Epileptic spasms (ES) are a unique seizure type typically presenting in the form of infantile epileptic spasms syndrome (IESS) with characteristic hypsarrhythmia on scalp EEG and a preponderance with developmental delay or regression. While pharmacotherapy is the mainstay of treatment, surgical options, including disconnective or resective procedures, are increasingly recognized as viable therapeutic options for recurrent or persistent ES. However, limited data on safety, effectiveness, and prognostic factors hinder informed decision-making regarding surgery indications, timing, and intervention type.
View Article and Find Full Text PDFTranscranial alternating current stimulation (tACS) at 5-Hz to the right hemisphere can alleviate anxiety symptoms. We aimed to explore the connectivity changes following the treatment. We collected electroencephalography (EEG) data from 24 participants with anxiety disorders before and after the tACS treatment during a single session.
View Article and Find Full Text PDFIctal EEG of benign convulsion with mild gastroenteritis with in infants and children.
Brain Dev
January 2025
Department of Clinical Neuroelectrophysiology, Wuhan Children's Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. Electronic address:
Objective: There are fewer reports on the ictal electroencephalogram(EEG) of convulsions in infants and children with mild gastroenteritis (BCWG). Our study retrospectively analyzed the ictal EEG characteristics of convulsive episodes of BCWG.
Methods: The seizure-phase EEGs of children diagnosed with BCWG from September 2016 to January 2022 were searched and analyzed, and a total of thirteen seizure-phase EEGs of eight cases were analyzed retrospectively.
Strength of low-frequency EEG phase entrainment to external stimuli is associated with fluctuations in the brain's internal state.
eNeuro
January 2025
Cognitive Psychology Unit, Faculty of Social Sciences, Leiden University, Wassenaarseweg 52 2333 AK, Leiden, Netherlands.
The brain attends to environmental rhythms by aligning the phase of internal oscillations. However, the factors underlying fluctuations in the strength of this phase entrainment remain largely unknown. In the present study we examined whether the strength of low-frequency EEG phase entrainment to rhythmic stimulus sequences varied with pupil size and posterior alpha-band power, thought to reflect arousal level and excitability of posterior cortical brain areas, respectively.
View Article and Find Full Text PDFElectroencephalography-guided transcranial direct current stimulation improves picture-naming performance.
Neuroimage
January 2025
School of Computing, Tokyo Institute of Technology, Yokohama, Japan; ATR Brain Information Communication Research Laboratory Group, Kyoto, Japan. Electronic address:
Transcranial direct current stimulation (tDCS) is a potential method for improving verbal function by stimulating Broca's area. Previous studies have shown the effectiveness of using functional magnetic resonance imaging (fMRI) to optimize the stimulation site, but it is unclear whether similar optimization can be achieved using scalp electroencephalography (EEG). Here, we investigated whether tDCS targeting a brain area identified by EEG can improve verbalization performance during a picture-naming task.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!