← Critical-care EEG
Background symmetry
Symmetric, mildly asymmetric, or markedly asymmetric background.
Criteria & assessment
- Mild: consistent voltage difference <50% on an appropriate referential recording or frequency difference 0.5–1 Hz.
- Marked: voltage difference >=50% or frequency difference >1 Hz.
- Consistent means >80% of relevant instances or record.
Source · 2021ACNS critical-care EEG terminology · PDF p. 4 ↗
Generation & measurement notes
- Choose the amplitude statistic and epoch aggregation for percent difference.
Editorial draft · clinical review pending