American Clinical Neurophysiology Society's Standardized Critical Care EEG Terminology: 2021 Version

Electroencephalographic Correlates of Cognition among Nigerian Women with Epilepsy on Anti-epileptic Monotherapy

“…PLED (Periodic Lateralizing Epileptiform Discharge) often are manifestations of increased neuronal excitability, irrespective of the underlying aetiology. [16,25,26] Van der Hiele et al described EEG as a marker of future cognitive performance with increased theta activity during eye closure and less alpha reactivity during eyes opening and memory activation indicating lower global and executive performance. A combination of information from EEG, MRI and neuropsychology is being proposed as a general model for decline cognitive performance in a heterogeneous population.…”

“…[18] Fast frequency was defined as alpha waves at frequencies of 8 -13 per second and beta waves at frequencies greater than 13 per second. [16,18,19] Theta waves were defined as frequencies between 4 -7 waves per second and delta waves as frequencies up to 4 waves per second. [16] Periodicity was defined as the repetition of a waveform with relatively uniform morphology and duration with a quantifiable inter-discharge interval between consecutive waveforms and recurrence of the wave at nearly regular intervals.…”

“…[16,18,19] Theta waves were defined as frequencies between 4 -7 waves per second and delta waves as frequencies up to 4 waves per second. [16] Periodicity was defined as the repetition of a waveform with relatively uniform morphology and duration with a quantifiable inter-discharge interval between consecutive waveforms and recurrence of the wave at nearly regular intervals. Discharges were referred to as waveforms with no more than three phases (crosses the baseline no more than twice) or any waveform lasting 0.5 seconds or less, regardless of the number of phases.…”

“…Bursts were defined as waveforms lasting more than 0.5 seconds and having at least four phases (crosses the baseline at least three times. [16] The Cognitive Screening Instrument for Dementia (CSID), a previously validated instrument in the environment was used to assess global cognitive functioning and various sub-cognition domains. [20] It is a culturally acceptable, paper and pen-based global cognitive function screening instrument, developed by Ibadan-Indianapolis Dementia Project for assessing language, memory, calculation, orientation and attention sub-domains.…”

A Review of the Electrophysiological Neuroprognostications after Out of Hospital Cardiac Arrest

“…We recognize that EEG terminology can be confusing for non-specialists so for those requiring a basic introduction to interpretation of the EEG in ICU, we recommend a prior publication from our group, and for more detailed definitions of specific EEG terms, the International Federation of Clinical Neurophysiology's revised glossary [17,18]. We adhere to recently proposed American Clinical Neurophysiology Society's (ACNS) standardized critical care EEG terminology: 2021 version [19]. Indeed, the lack of standardization in EEG reporting and the inter-rater variability specifically have perhaps limited its clinical application in neuroprognostication [5].…”