Fig. 2

Comparison of heart rate between the two groups. Note: T0 : before anesthesia, T1: at the disappearance of the eyelash reflex, T2 : after placement of the gastroscope, T3 : at the end of the operation, T4 : during full patient awakening, T5 : at discharge from the hospital, *: group C vs. group P, a: vs. T0, b: vs. T1, c: vs. T5