Article, 2024

Systematic review of seizure-onset patterns in stereo-electroencephalography: Current state and future directions

Clinical Neurophysiology, ISSN 1872-8952, 1872-6380, 1388-2457, Volume 163, Pages 112-123, 10.1016/j.clinph.2024.04.016

Contributors

Abdallah, Chifaou (Corresponding author) [1] [2] Mansilla, Daniel 0000-0002-5445-2526 [1] [2] Minato, Erica [3] Grova, Christophe 0000-0003-2775-9968 [1] [2] [4] Beniczky, S X E Ndor 0000-0002-6035-6581 [5] [6] Frauscher, Birgit (Corresponding author) [3] [7]

Affiliations

  1. [1] McGill University
    2. [NORA names: Canada; America, North; OECD];
  2. [2] Montreal Neurological Institute and Hospital
    3. [NORA names: Canada; America, North; OECD];
  3. [3] Duke University Hospital
    4. [NORA names: United States; America, North; OECD];
  4. [4] Concordia University
    5. [NORA names: Canada; America, North; OECD];
  5. [5] Aarhus University Hospital
    6. [NORA names: Central Denmark Region; Hospital; Denmark; Europe, EU; Nordic; OECD];

Abstract

OBJECTIVE: Increasing evidence suggests that the seizure-onset pattern (SOP) in stereo-electroencephalography (SEEG) is important for localizing the "true" seizure onset. Specifically, SOPs with low-voltage fast activity (LVFA) are associated with seizure-free outcome (Engel I). However, several classifications and various terms corresponding to the same pattern have been reported, challenging its use in clinical practice. METHOD: Following the Preferred Reporting Items of Systematic reviews and Meta-Analyses (PRISMA) guideline, we performed a systematic review of studies describing SOPs along with accompanying figures depicting the reported SOP in SEEG. RESULTS: Of 1799 studies, 22 met the selection criteria. Among the various SOPs, we observed that the terminology for low frequency periodic spikes exhibited the most variability, whereas LVFA is the most frequently used term of this pattern. Some SOP terms were inconsistent with standard EEG terminology. Finally, there was a significant but weak association between presence of LVFA and seizure-free outcome. CONCLUSION: Divergent terms were used to describe the same SOPs and some of these terms showed inconsistencies with the standard EEG terminology. Additionally, our results confirmed the link between patterns with LVFA and seizure-free outcomes. However, this association was not strong. SIGNIFICANCE: These results underline the need for standardization of SEEG terminology.

Keywords

EEG, EEG terminology, Engel, Engel I, Items of Systematic Reviews, PRISMA, Preferred Reporting Items, Preferred Reporting Items of Systematic Reviews, activity, associated with seizure-free outcome, association, classification, clinical practice, criteria, current state, direction, divergent terms, evidence, fast activity, figures, guidelines, inconsistencies, increasing evidence, low-voltage fast activity, onset, outcomes, patterns, periodic spikes, practice, preferences, presence, results, review, review of studies, seizure onset, seizure-free outcome, seizure-onset patterns, seizures, selection, selection criteria, spikes, standards, state, stereo-electroencephalography, study, systematic review, systematic review of studies, term, terminology, variables, weak association

Funders

  • Canadian Institutes of Health Research

Data Provider: Digital Science

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