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Ventricular ectopy treatment — FRCA Primary MCQ

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ModeratePharmacologyVentricular ectopy treatmentFRCA Primary

During anaesthesia, ventricular ectopy improves after a class Ib sodium-channel blocker. Which drug is most likely?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Lidocaine

Lidocaine is a class Ib antiarrhythmic and blocks ventricular sodium channels. Ondansetron is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Sugammadex is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Prilocaine is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Magnesium sulphate is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA pharmacology, link the clinical effect to the receptor, distribution or elimination mechanism rather than memorising isolated facts.

Reference: Peck, Hill & Williams Pharmacology for Anaesthesia and Intensive Care; BNF; Primary FRCA textbooks