2.3.1. Anesthesia Introduction and Maintenance
Anesthesia introduction was performed by the administration of 2–3 mg/kg propofol (produced by Fresenius Kabi Austria GmbH, subpackage by Beijing Fresenius Capi Medical Co., Ltd., Beijing, China), 0.1 mg/kg vecuronium bromide (Yangzijiang Pharmaceutical Group Co., Ltd., Jiangsu, China), and 2–5 