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This study aimed to investigate the effect of preoperative ultrasound-guided stellate ganglion block (SG on the perioperative stress responses and gastrointestinal functions of patients undergoing laparoscopic colorectal cancer surgery. A total of 60 colorectal cancer patients were enrolled in study and were randomized to be treated with or without SGB therapy. In the SGB group, patients were injected with 7 mL 0.5% ropivacaine in stellate ganglion under ultrasound guidance before anesthesia. (MAP), heart rate (HR), recovery of bowel soun