Sevoflurane Desiccated Absorbent — FRCA Primary MCQ
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Correct answer: D — Both compound A and potentially formaldehyde
Sevoflurane reacting with desiccated CO2 absorbents (particularly barium hydroxide lime) can produce compound A / formaldehyde / carbon monoxide / and methanol. The risk is greatest with desiccated absorbent. Fresh non-desiccated soda lime produces primarily compound A at low levels. Maintaining absorbent hydration is a key safety measure.
Reference: Peck Hill Williams 2014 Pharmacology for Anaesthesia and Intensive Care