Experimental procedure
INVOS cerebral oximeter
After patient arriving in the operating room, 5-lead electrocardiography, pulse oximetry, and non-invasive automatic blood pressure cuff were implemented for basic monitoring. INVOS cerebral oximeter (Somanetics, Troy, MI, USA) was applied for monitoring of operative side SrOThe induction of general anesthesia was performed via infusion of 0.3 mg/kg remimazolam in R group or 1.5-2 mg/kg propofol in P group within 30 s [