← Critical-care EEG
Cyclic alternating pattern of encephalopathy
Regular spontaneous alternation of two backgrounds: present, absent, or unknown/unclear.
Criteria & assessment
- Each pattern lasts >=10 s and the pair alternates spontaneously/regularly for >=6 complete cycles; a cycle includes each state once.
- Describe each pattern and typical duration; note awake/stimulated versus less-awake state when known.
- If each pattern lasts >60 s, state-change criteria are also met.
Source · 2021ACNS critical-care EEG terminology · PDF p. 7 ↗
Generation & measurement notes
- Define tolerance for 'regular'; S01 does not.
Editorial draft · clinical review pending