← Critical-care EEG
Ictal-interictal continuum
EEG patterns that do not meet definite seizure criteria but may contribute to impaired alertness, symptoms or neuronal injury in the appropriate clinical context.
Criteria & assessment
- Always exclude ESz/ESE.
- Pathway A: PD/SW averages >1 and <=2.5 Hz over 10 s.
- Pathway B: PD/SW averages >=0.5 and <=1 Hz over 10 s AND (has a plus modifier OR fluctuation).
- Pathway C: lateralized RDA averages >1 Hz for >=10 s AND (has a plus modifier OR fluctuation); includes LRDA, BIRDA, UIRDA and MfRDA.
- IIC describes an electrographic category, not a diagnosis or an automatic treatment order.
Source · 2021ACNS critical-care EEG terminology · PDF p. 25 ↗
Focal ictal-interictal continuum · EEG 28 · PDF p. 32 ↗Editorial draft · clinical review pending