ACNS Standardized Critical Care EEG Terminology

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Across
  1. 4. Change in cerebral EEG activity( amplitude or frequency)to stimulation
  2. 5. 10 to 49% (major modifier/Prevalence)
  3. 11. An electrographic seizure for either > or = to 10 continuous minutes or a total duration of 20% of any 60 minute period of recording
  4. 12. 1 to 9% ( major modifier/Prevalence)
  5. 13. 1-9% periods of suppression or attenuation (Continuity)
  6. 14. 10-49% periods of suppression or attenuation(Continuity)
  7. 15. 50 to 89% (major modifier/Prevalence)
  8. 16. < 50% voltage OR 0.5-1 Hz frequency (EEG background)
  9. 17. < 70 ms
Down
  1. 1. 70 ms - 200 ms
  2. 2. <1%periods of suppression or attenuation but <50% of background voltage(Continuity)
  3. 3. Ictal-Interictal Continuum
  4. 6. < 1% ( major modifier/Prevalence)
  5. 7. Brief Potentially Ictal Rhythmic Discharges
  6. 8. > or = 50% voltage or > 1 Hz frequency (EEG background)
  7. 9. > 99% periods of suppression or attenuation(Continuity)
  8. 10. Cyclic Alternating Pattern of Encephalopathy
  9. 11. Epileptiform discharges averaging>2.5 Hz for > or = 10s(>25 discharges in 10s or any pattern with definite evolution lasting > or = 10 seconds