Ethical statements
cancer, Cancer
CANCER, RECRUITMENT, CANCER
This study was approved by the Ethics Committee of the Jiangsu Cancer Hospital on 30 March, 2020 (approval number: R-2020-039). Patient consent was waived because of the retrospective study design. The authors did not obtain information identifying individual participants during or after data collection.In this single-center retrospective observational study, 1614 consecutive patients who underwent abdominal surgery in our institution between January 2015 and October 2019 (Time of patient recruitment) were enrolled. The baseline, intraoperative, postoperative, clinical, and follow-up data of each patient were collected and retrospectively reviewed in November 2020. Physical characteristics included age, body mass index (BMI) (kg/mPatients with cancer who were scheduled for elective major abdominal surgery under general anesthesia with total intravenous anesthesia were included in the study. The exclusion criteria were as follows: (1) age < 18 years or > 70 years; (2) BMI ≥35 kg/m