Pin index — FRCA Primary MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: E — Pin index system
The pin index system prevents wrong cylinder attachment. Mapleson D is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Desflurane heated pressurised vaporiser 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. Leakage current control and isolation 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