Mapleson A Spontaneous — FRCA Primary MCQ

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ModeratePhysics & Clinical MeasurementMapleson A SpontaneousFRCA Primary

A Mapleson A (Magill) circuit is most efficient for:

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Correct answer: B — Spontaneous ventilation requiring FGF equal to minute ventilation

Mapleson A is most efficient for spontaneous ventilation (FGF = MV). Mapleson D is most efficient for controlled ventilation (FGF = 2-3 × MV). Mnemonic: spontaneous alphabetical (A best) / controlled reverse (D best).

Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment