ACNSStandardizedCriticalCareEEGTerminology_rev2021-pages-5.pdf

Standardized Critical Care EEG Terminology L. J. Hirsch, et al. 2. Daily Seizure Burden can be calculated similarly: e.g., six 30- second seizures in one day would have a Daily Seizure Burden DIAGRAM LIST of 3 minutes....

Standardized Critical Care EEG Terminology L. J. Hirsch, et al. 2. Daily Seizure Burden can be calculated similarly: e.g., six 30- second seizures in one day would have a Daily Seizure Burden DIAGRAM LIST of 3 minutes. 1a. Asymmetry: voltage (mild) 1b. Asymmetry: frequency (mild) NOTE: Hourly pattern burden and hourly sei- 1c. Asymmetry (marked) zure burden can be calculated and reported in a similar 2. Continuity manner as the daily burdens, as can maximal hourly burden 3. Discharge vs. Burst of each. 4. Attenuation percent or Suppression percent 3. Daily Pattern Index is defined as Daily Burden X Mean 5. Localization of bursts Frequency (Hz). In the above example, if GPDs were at 1.5 6a. Highly Epileptiform Bursts Hz, the Daily GPD Index would be 5.2 h · 1.5 Hz ¼ 7.8 Hz- 6b. Highly Epileptiform Bursts hours. Similarly, an hourly pattern index can be described. For 7a. Identical Bursts example, 1.5-Hz LPDs with a prevalence of 20% for 1 hour 7b. Identical Bursts in a Stereotyped Cluster would have an hourly pattern index of 12 minutes · 1.5 Hz ¼ 8. State changes 18 Hz-mins. 9. Cyclic Alternating Pattern of Encephalopathy (CAPE) 10. Anterior-posterior (AP) gradient 11. Sporadic Epileptiform Discharges 12. Polyspike vs. BIRDs vs. Highly Epileptiform Burst ABBREVIATION LIST 13. Generalized Periodic Discharges (GPDs) ACNS ¼ American Clinical Neurophysiology Society 14. Lateralized Periodic Discharges (LPDs, unilateral) BI ¼ Bilateral Independent 15. Lateralized Periodic Discharges (LPDs, bilateral BIRDs ¼ Brief Potentially Ictal Rhythmic Discharges asymmetric) BTC ¼ Bilateral Tonic-Clonic 16. Lateralized Periodic Discharges (LPDs, bilateral CAPE ¼ Cyclic Alternating Pattern of Encephalopathy asynchronous) CCEMRC ¼ Critical Care EEG Monitoring Research 17. Bilateral Independent Periodic Discharges (BIPDs) Consortium 18. Unilateral Independent Periodic Discharges (UIPDs) ECSz ¼ Electroclinical seizure 19. Multifocal Periodic Discharges (MfPDs) ECSE ¼ Electroclinical status epilepticus 20. Periodic Discharges (PDs) EDs ¼ Epileptiform Discharges 21. Rhythmic Delta Activity (RDA) EDB ¼ Extreme Delta Brush 22. “Spike and Wave” or “Sharp and Wave” (SW) EEG ¼ Electroencephalography 23. Number of Phases ESE ¼ Electrographic status epilepticus 24. Evolution of frequency ESz ¼ Electrographic seizure 25. Evolution of morphology G ¼ Generalized 26. Evolution of location GPFA ¼ Generalized Paroxysmal Fast Activity 27. Fluctuating frequency Hz ¼ Hertz (i.e., per second) 28. Fluctuating morphology IIC ¼ Ictal-Interictal Continuum 29. Fluctuating location L ¼ Lateralized 30. Lateralized Periodic Discharges PLUS fast activity Mf ¼ Multifocal (LPDs1F) PDs ¼ Periodic Discharges 31. Rhythmic Delta Activity PLUS fast activity (RDA1F) RDA ¼ Rhythmic Delta Activity 32. Periodic Discharges PLUS RDA (PD1R) RPP ¼ Rhythmic or Periodic Pattern (i.e., PDs, RDA or 33. Generalized Rhythmic Delta Activity PLUS Spikes SW) (GRDA1S) SE ¼ Status epilepticus 34. Bilateral Independent Periodic Discharges PLUS fast SI ¼ Stimulus-Induced. activity (BIPDs1F) SIRPIDs ¼ Stimulus-Induced Rhythmic, Periodic or Ictal- 35a. Extreme Delta Brush (EDB) Appearing Discharges 35b. Extreme Delta Brush (EDB): RDA subtype ST ¼ Stimulus-Terminated 35c. Extreme Delta Brush (EDB): PDs subtype SW ¼ Spike-and-wave or sharp-and-wave 36a. Generalized Extreme Delta Brush (GEDB) UI ¼ Unilateral Independent 36b. Lateralized Extreme Delta Brush (LEDB) 1 ¼ Plus ¼ Additional feature which renders the pattern 36c. Bilateral Independent Extreme Delta Brush (BIEDB) more ictal-appearing than the usual term without the plus 37. Anterior-posterior (AP) lag 1F ¼ Superimposed fast activity 38. Electrographic seizure (ESz) 1R ¼ Superimposed rhythmic activity 39. Electroclinical seizure (ECSz) 1S ¼ Superimposed sharp waves or spikes, or sharply 40. Electroclinical seizure (ECSz) – for patients with prior contoured known epileptic encephalopathy clinicalneurophys.com Journal of Clinical Neurophysiology Volume 38, Number 1, January 2021 27 Copyright © by the American Clinical Neurophysiology Society. Unauthorized reproduction of this article is prohibited.  L. J. Hirsch, et al. Standardized Critical Care EEG Terminology 41a. Brief Potentially Ictal Rhythmic Discharges (BIRDs) EEG 29c Ictal-Interictal Continuum (IIC) – Generalized (definite) EEG 30 Ictal-Interictal Continuum (IIC) with Quantitative 41b. Brief Potentially Ictal Rhythmic Discharges (BIRDs) EEG (QEEG) (definite) 41c. Brief Potentially Ictal Rhythmic Discharges (BIRDs) (definite) 41d. Brief Potentially Ictal Rhythmic Discharges (BIRDs) REFERENCES (possible) 1. Hirsch LJ, Brenner RP, Drislane FW, et al. The ACNS subcommittee 42. 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