Volatile EEG Delta at 1 MAC — FRCA Primary MCQ

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ModeratePharmacology - Inhalational AgentsVolatile EEG Delta at 1 MACFRCA Primary

Regarding volatile agents and the EEG all volatile agents produce dose-dependent EEG changes. At 1-1.5 MAC the predominant pattern is:

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Correct answer: B — Delta activity with high amplitude slow waves

At 1-1.5 MAC volatile agents produce high-amplitude delta (slow) activity. At light anaesthesia (0.5-1 MAC): mixed frequency with increasing theta. At deep anaesthesia (>1.5-2 MAC): burst suppression. At very deep levels: isoelectric EEG. Enflurane and sevoflurane may produce epileptiform activity at high concentrations.

Reference: Peck Hill Williams 2014 Pharmacology for Anaesthesia and Intensive Care