Standardized critical care EEG terminology: ۲۰۲۱ version

In this presentation, I will discuss about some of the important EEG terms, includingPeriodic and rhythmic discharges and its significance.The two common EEG terms “evolution” & “fluctuation”. In summary, “evolution” in EEG means at least two unequivocal, sequential changes in waveform frequency, morphology, or location. “Fluctuation in EEG” means, three or more changes in frequency (by at least ۰.۵ Hz), morphology or location, but not qualifying as evolving.“Electrographic seizure” is defined as either: epileptiform discharges more than ۲.۵ Hz for at least ۱۰ seconds or any pattern with definite evolution, lasting at least ۱۰ seconds.“Electrographic status epilepticus” is defined as an electrographic seizure for more than ۱۰ continuous minutes or for a total duration of ≥۲۰% of any ۶۰-minute period of recording.“Electroclinical seizures” defined as: Any definite clinical correlate time-locked to the pattern (of any duration) or EEG and clinical improvement with intravenous antiseizure medication.