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Fine ventricular fibrillation — DipIMC MCQ

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ModerateResuscitationFine ventricular fibrillationDipIMC

A 79-year-old woman has a witnessed collapse. After two minutes of CPR the monitor shows fine VF; the team is unsure whether it might be asystole. What is the most appropriate immediate action?

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

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Correct answer: E — Optimise pad contact and defibrillate if VF is confirmed without a prolonged pause

Fine VF can be mistaken for asystole, so the team should check leads, gain and pad contact quickly while minimising interruptions. Confirmed VF is shockable and should be defibrillated. Prolonged pulse checks reduce perfusion and do not help rhythm interpretation. The pearl is that rhythm uncertainty should be resolved quickly and systematically.

Reference: Resuscitation Council UK Adult ALS Guidelines 2025