Figure 2. Systolic and diastolic systemic blood pressure (mean +/- SD) were measured before induction of anesthesia (baseline), at the time of loss of the eyelash reflex, and at the time of return of conjugate gaze in the three treatment groups: sevoflurane in 100% oxygen, sevoflurane in 66% nitrous oxide, and halothane in 66% nitrous oxide. Compared with the baseline values, systolic blood pressure decreased at the time of return of conjugate gaze in the sevoflurane-oxygen (**P < 0.01) and sevoflurane-nitrous oxide groups (*P < 0.05) and at both loss of the eyelash reflex and conjugate gaze in the halothane-nitrous oxide group (**P < 0.01). Compared with baseline values, diastolic blood pressure decreased at the time of return of conjugate gaze in the halothane-nitrous oxide group (*P < 0.05).