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EEG Beta Light Anaesthesia — FRCA Primary MCQ

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HardPhysiology - NeurophysiologyEEG Beta Light AnaesthesiaFRCA Primary

During propofol general anaesthesia, a processed EEG trace develops coherent frontal alpha activity with accompanying slow oscillations. Compared with awake eyes-closed alpha rhythm, which interpretation is most appropriate?

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Correct answer: B — It reflects thalamocortical synchronisation produced by propofol during surgical anaesthesia

The best answer is “It reflects thalamocortical synchronisation produced by propofol during surgical anaesthesia”. Propofol commonly produces coherent frontal alpha activity coupled to slow oscillations through altered thalamocortical network dynamics. Alpha frequency alone neither proves wakefulness nor seizure. Burst suppression consists of alternating electrically silent and high-amplitude periods, not merely slow oscillations. EEG is cortical and cannot establish neuromuscular recovery.

Reference: RCoA, Primary FRCA syllabus: https://www.rcoa.ac.uk/sites/default/files/documents/2026-01/Primary-FRCA-Syllabus.pdf; Modelling the dynamical effects of anaesthesia on brain circuits: https://pubmed.ncbi.nlm.nih.gov/24457211/