MAC N2O 104% — FRCA Primary MCQ

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EasyPharmacology - Inhalational AgentsMAC N2O 104%FRCA Primary

The MAC of nitrous oxide is approximately:

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Correct answer: D — 104%

MAC of N2O is approximately 104%. This means it cannot produce surgical anaesthesia as a sole agent at sea level. Maximum deliverable concentration with adequate oxygenation is approximately 70%. It is always used as a supplement.

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