[Answer] You are part of a team attempting to resuscitate a child with ventricular fibrillation cardiac arrest. You delivered 2 unsynchronized shocks. A team member established IO access so you give a dose of epinephrine 0.01 mg/kg IO. At the next rhythm check persistent ventricular fibrillation is present. You administer a 4 J/kg shock and resume CPR. Which drug and dose should be administered next?