Electrical isolation — FRCA Primary MCQ

Correct answer: A — Leakage current control and isolation

Electrical isolation and leakage current control reduce the risk of macroshock and microshock in theatre. Exothermic carbon dioxide absorption is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Doppler frequency shift 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. Hydrostatic levelling error 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