Effect of Midazolam Premedication Before Induction on the Functional Recovery After General Anesthesia in the Patients Undergoing Breast Surgery Due to Breast Cancer

"On the day when patients are scheduled for operation, one researcher will use a computer to randomly select and allocate patients. By randomization, patients will be divided into two groups, receiving an injection of either 0.02 mg/kg of midazolam(midazolam group) or saline (control group). The researcher who randomly allocated patients will prepare the medicines but not just medicine. Investigators must mix it with normal saline to obtain a total volume of 5 mL and label two of them all prepared medicine, never letting the doctors and subjects know which is midazolam and which is saline.~Use the QoR-40 survey form to investigate the functional recovery of the patient. This survey will be administered before the operation and on the first and second days after the operation; it will be administered three times in total."