Effect of Zusanli Injection of Tramadol on Catheter-related bladder discomfort in Gynecological Patients Under General Anesthesia

INTERVENTION: blank control group:Intravenous injection of 4ml normal saline following psychological comfort;Acupoint Normal Saline Group:Bilateral Zusanli acupoint injection of 2ml normal saline per acupoint (total 4ml) following psychological comfort;Acupoint Tramadol Group:Bilateral Zusanli acupoint injection of tramadol (1.5mg/kg) diluted to 4ml with normal saline, 2ml per acupoint;Intravenous Tramadol Group:Intravenous tramadol (1.5mg/kg) diluted to 4ml with normal saline following psychological comfort; CONDITION: Catheter‐related bladder discomfort PRIMARY OUTCOME: CRBD severity; SECONDARY OUTCOME: Pain score;Postoperative nausea and vomiting;Comfort level;Additional analgesic/antiemetic use;Satisfaction; INCLUSION CRITERIA: ASA physical status I‐II, age >18 years, elective gynecological surgery patients with intraoperative catheterization reporting moderate‐to‐severe CRBD.