Defibrillation oxygen — FRCA Primary MCQ

Correct answer: A — Oxygen-enriched fire risk

Defibrillation in an oxygen-enriched environment creates a fire risk, so free-flowing oxygen should be moved away when safe. Residual non-depolarising neuromuscular block is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Hydrostatic levelling error is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Non-interchangeable screw thread is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. EMG activity can falsely raise the index 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