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Plasma epinephrine concentrations in lambs that achieved ROSC following 2 doses of tracheal epinephrine without any intravenous epinephrine. The peak value at 8 minutes (ie, 4 minutes after the last ETT dose) occurred following ROSC. Arrows indicate ETT epinephrine at 0.1 mg/kg. Data are mean±SEM. ETT indicates endotracheal tube; ROSC, return of spontaneous circulation.
