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A 62-year-old man collapses in the emergency department waiting room. He is pulseless and the monitor shows ventricular fibrillation. Chest compressions are in progress at a rate of 110 per minute, a supraglottic airway is in place with the highest available oxygen, and a large-bore intravenous cannula has been sited. Three shocks at maximum energy have now been delivered two minutes apart, and adrenaline 1 mg was given immediately after the second shock. He remains in ventricular fibrillation and compressions have resumed. Which one of the following should be done during this two-minute cycle?
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