Mapleson D — FRCA Primary MCQ
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Correct answer: B — Mapleson D
The Bain system is a coaxial Mapleson D system. Sampling tube transit delay is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Infrared gas analyser is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Paramagnetic oxygen analyser is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Hypoxic guard is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA physics and measurement, the safest answer is the one that follows the underlying physical principle and the limitations of the device.
Reference: Davis and Kenny Basic Physics and Measurement in Anaesthesia; RCoA Primary FRCA syllabus