Ictal high-frequency oscillations on scalp EEG recordings in symptomatic West syndrome

Iwatani, Y; Kagitani‐Shimono, Kuriko; Tominaga, Koji; Okinaga, Takeshi; Kishima, Haruhiko; Kato, Aitaro; Nagai, Toshisaburo; Ozono, Keiichi

doi:10.1016/j.eplepsyres.2012.04.020

Cited by 44 publications

(36 citation statements)

References 37 publications

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“…Then, the trigger point for time-frequency analyses (set at 0 ms) was set in a temporally expanded trace with LFF 53Hz, HFF off, based on the initial EMG deflection (examples in Figures 1–3), as previously reported. 18, 20 …”

Section: Methodsmentioning

confidence: 99%

Scalp EEG Ictal gamma and beta activity during infantile spasms: Evidence of focality

et al. 2017

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Objective We investigated temporal and spatial characteristics of ictal gamma and beta activity on scalp EEG during spasms in patients with West syndrome (WS) to evaluate potential focal cortical onset. Methods A total of 1033 spasms from 34 patients with WS of various etiologies were analyzed in video-EEG using time-frequency analysis. Ictal gamma (35–90 Hz) and beta (15–30 Hz) activities were correlated with visual symmetry of spasms, objective EMG (electromyography) analysis, and etiology of WS. Results Prior to the ictal motor manifestation, focal ictal gamma activity emerged from one hemisphere (71%, 24/34) or from midline (26%, 9/34), and was rarely simultaneously bilateral (3%, 1/34). Focal ictal beta activity emerged from either one hemisphere (68%, 23/34) or from midline (32%, 11/34). Onsets of focal ictal gamma and beta activity were most commonly observed around the parietal areas. Focal ictal gamma activity propagated faster than ictal beta activity to adjacent electrodes (median: 65 vs. 170 ms, p<0.01), and to contralateral hemisphere (median: 100 vs. 170 ms, p=0.01). Asymmetric peak amplitude of ictal gamma activity in the centroparietal areas (C3-P3 vs. C4-P4) correlated with asymmetric semiology. On the other hand, the majority of visually symmetric spasms showed asymmetry in peak amplitude and interhemispheric onset latency difference in both ictal gamma and beta activity. Significance Spasms may be a seizure with focal electrographic onset regardless of visual symmetry. Asymmetric involvement of ictal gamma activity to the centroparietal areas may determine the motor manifestations in WS. Scalp EEG ictal gamma and beta activity may be useful to demonstrate localized seizure onset in infants with WS.

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Section: Methodsmentioning

confidence: 99%

Scalp EEG Ictal gamma and beta activity during infantile spasms: Evidence of focality

et al. 2017

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“…They have a relationship with the period of active seizure occurrence in idiopathic partial epilepsy (Kobayashi et al, 2011); they are associated with the lesional zone in patients with symptomatic West syndrome (Iwatani et al, 2012); they co-localize with the ictal onset sites in a pediatric cohort of patients (Wu et al, 2008); and they are a marker of the SOZ in adults with focal epilepsy (Andrade-Valenca et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Occurrence of scalp-fast oscillations among patients with different spiking rate and their role as epileptogenicity marker

et al. 2013

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“…Some researchers have employed time-frequency analyses to determine the IOZ (Iwatani et al, 2012;Kobayashi et al, 2013;Ochi et al, 2007;Sueda et al, 2013;Yagyu et al, 2010), while others have adopted recently developed forward solution models, such as LORETA, sLORETA, MUSIC, MEG beamformer, and dSPMs, in their ictal source localization studies (Fujiwara et al, 2012;Tanaka et al, 2009). Most of the previous studies using these advanced analytical methods have reported better IOZ localization results than those obtained via conventional ECD analysis.…”

Section: Introductionmentioning

confidence: 99%

Usefulness of multiple frequency band source localizations in ictal MEG

Jeong

Kim

Chung

2016

Clinical Neurophysiology

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Ictal high-frequency oscillations on scalp EEG recordings in symptomatic West syndrome

Cited by 44 publications

References 37 publications

Scalp EEG Ictal gamma and beta activity during infantile spasms: Evidence of focality

Scalp EEG Ictal gamma and beta activity during infantile spasms: Evidence of focality

Occurrence of scalp-fast oscillations among patients with different spiking rate and their role as epileptogenicity marker

Usefulness of multiple frequency band source localizations in ictal MEG

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