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Interictal coupling of HFO s and slow oscillations predicts the seizure‐onset pattern in mesiotemporal lobe epilepsy
Author(s) -
Amiri Mina,
Frauscher Birgit,
Gotman Jean
Publication year - 2019
Publication title -
epilepsia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.687
H-Index - 191
eISSN - 1528-1167
pISSN - 0013-9580
DOI - 10.1111/epi.15541
Subject(s) - ictal , epilepsy , neuroscience , temporal lobe , epileptogenesis , psychology , coupling (piping) , physics , materials science , metallurgy
Objective Low‐voltage fast activity ( LVF ) and low‐frequency high‐amplitude periodic spiking ( PS ) are the two most common seizure‐onset patterns in mesiotemporal lobe epilepsy, with different underlying mechanisms, pathology, and postsurgical outcome. The present work aims to investigate whether specific coupling patterns of high‐frequency oscillations ( HFO s >80 Hz) and low‐frequency waves in the interictal period may distinguish these two patterns, and also seizure‐onset zone ( SOZ ) from non‐ SOZ as a secondary aim. Methods We used intracranial electroencephalography (i EEG) data (during non–rapid eye movement [ NREM ] sleep) of 18 patients with either LVF or PS seizure‐onset patterns. We investigated the interaction between HFO s (ripples: 80‐250 Hz and fast ripples: >250 Hz) and slow oscillations (slow‐delta, delta, and theta waves). We compared classic features (amplitude, duration, frequency, and power) and phase of coupling between HFO s and slower oscillations inside and outside the SOZ . We then used these features to classify HFO s and subsequently patients into LVF and PS groups. Results Ripples in the LVF group had significantly longer duration, lower frequency, and higher amplitude than in the PS group. The phase of slow oscillations at which HFO s occur is different between the LVF and PS HFO s ( LVF , mostly at the peak or the transition of peak to trough; PS , mostly during the transition of trough to peak). HFO s associated with theta waves best discriminate seizure‐onset patterns. The coupling phase improves the classification of HFO s and patients to either LVF or PS groups, and also the classification of HFO s in SOZ and non‐ SOZ . Significance The phase of coupling of HFO s and low‐frequency waves may help to not only identify the SOZ , but also to classify patients with different types of seizure‐onset patterns. It likely reflects that different disease processes are involved in these patterns during the interictal period.