“Serum epinephrine levels increased in the halothane-hypoxia:hypercarbia and enflurane:hypoxia groups and, after the injection of succinylcholine, epinephrine levels increased further in dogs in the halothanexontrol, halothane:hypoxia, halothane-hypoxia:hypercarbia, enflurane:hypoxia, and enflurane-hypoxia:hypercarbia groups.”