To Investigate the Effect of Esketamine Hydrochloride on Pulmonary Complications

The low dose esketamine hydrochloride group was given 0.2mg/kg at induction of anesthesia, the high dose esketamine hydrochloride group was given 0.4mg/kg at induction of anesthesia, and the blank control group was not given Esketamine hydrochloride injection at induction of anesthesia.