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Plasma epinephrine concentrations from lambs that received multiple doses of epinephrine. All lambs in the ETT followed by IV group required at least 1 dose of intravenous epinephrine. Arrows indicate epinephrine administration. In the IV followed by IV group, all doses were IV at 0.03 mg/kg. In the ETT followed by IV group, epinephrine for the first 2 doses was 0.1 mg/kg by ETT, followed by IV epi at 0.03 mg/kg. Data are mean±SEM. ETT indicates endotracheal tube.
