Effect of transcutaneous auricular vagus nerve stimulation on postoperative gastrointestinal dysfunction in patients undergoing laparoscopic radical resection of colorectal cancer - a single-center, randomized, double-blind, controlled trial

Interventions: Test group:Stimulator treatment site placed in the ear nail boat area (set at a frequency of 25Hz, 200 µs pulse width),Each patient was treated once at 30 minutes, stimulation once a day for three days after surgery.;Control group:The electrode of the instrument was placed at the corresponding position, but no electrical stimulation was given.
Primary outcome(s): The patient reported the time of first exhaust after operation
Study Design: Parallel