Fig. 2

T15, T30, T45, and T60 designate 15, 30, 45, and 60 minutes after the initiation of anesthetic induction. Group INH/100 are subjects age 18 to 55 years who had an inhalation induction with 8% sevoflurane in 100% oxygen. Group INH/50 are subjects age 18 to 55 years who had an inhalation induction with 8% sevoflurane in 50% oxygen and 50% nitrous oxide. Group PROP are subjects age 18 to 55 years who had an intravenous induction with 2.2 mg/kg propofol. Group Phnl/PROP are subjects age 18 to 55 years who had an intravenous induction with 2.2 mg/kg propofol that was preceded by 160 mcg phenylephrine. Group INH/100>55 are subjects age >55 years who had an inhalation induction with 8% sevoflurane in 100% oxygen. Group INH/50>55 are subjects age >55 years who had an inhalation induction with 8% sevoflurane in 50% oxygen and 50% nitrous oxide