Ayre's T-Piece No Valves — FRCA Primary MCQ
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Correct answer: A — It has no valves and no reservoir bag (in its original form) making it suitable for small children
The original Ayre's T-piece (Mapleson E) has no valves and no reservoir bag minimising dead space and resistance making it ideal for neonates and small children. The Jackson-Rees modification (Mapleson F) adds an open-ended reservoir bag allowing controlled ventilation and visual assessment of breathing. FGF for spontaneous breathing is 2-3 × MV.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment