A comparative study of the effects of Remimazolam Tosilate and Sevoflurane on perioperative oxidative stress response in patients undergoing radical surgery for colorectal cancer

Interventions: The sevoflurane group (S group) :The S group received inhalational anesthesia with sevoflurane for induction and maintenance.;Remazolam group (R group):Induction and maintenance of anesthesia using remidazolam Primary outcome(s): Catalase;Glutathione;Oxidized glutathione;Malondialdehyde;Superoxide dismutase Study Design: Parallel