Abstract:Objective: To analyze the high-risk factors of vomiting caused by single intravenous tramadol 100g analgesia during the recovery period of general anesthesia, so as to provide reference for rational use of tramadol. Methods: Clinical data of 476 cases of intravenous tramadol analgesia during anesthesia recovery period from October 2017 to April 2019 were analyzed retrospectively. The correlation between the age, sex, BMI, type of operation, methods of anesthesia maintenance, operation time, blood loss, infusion volume, tramadol administration before/after awakening, the speed of tramadol administration and the incidence of vomiting treatment with metoclopramide after tramadol intravenous administration were analyzed. The high-risk factors of vomiting after single intravenous administration of tramadol 100 mg during anesthesia recovery period were explored. Results: 476 patients used tramadol, 294 patients intravenous administration tramadol fast, 30 patients vomited, 182 patients administration slowly, 3 patients vomited (10.2% vs 1.65%, P = 0.000); 297 patients acceptted tramadol before awakening, 8 patients vomited after awakening, 179 patients acceptted tramadol after awakening, 25 patients vomited (2.7% vs 14.0%, P = 0.000); Binary logistic regression analysis showed that administration of tramadol after awakening (OR = 5.204, P = 0.000) and rapid administration of tramadol (OR = 4.485, P = 0.025) were independent risk factors for vomiting after single intravenous administration of tramadol. Conclusion: Slow intravenous administration of tramadol before general anesthesia recovery can significantly reduce the incidence of vomiting caused by tramadol.