Effect of a single sub-anesthetic dose of ketamine on postoperative fatigue syndrome in patients after laparoscopic radical resection of colorectal cancer: a randomized controlled trial

Interventions: Ketamine group (group K):5 minutes before the start of surgery, 0.3 mg/kg of ketamine was intravenously injected;Control group (group C):5 minutes before the start of surgery, 0.006 ml/kg of saline was intravenously injected Primary outcome(s): Christensen postoperative fatigue score Study Design: Parallel