Mapleson D FGF Controlled — FRCA Primary MCQ
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Correct answer: B — 2-3 × minute ventilation
The Mapleson D requires FGF of approximately 70 mL/kg/min (2-3 × MV) for controlled ventilation. For spontaneous ventilation it is inefficient requiring 2-3 × MV. The inner tube carries fresh gas and the outer tube is the expiratory limb in the Bain coaxial configuration.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment