Outcomes and data collection
PONV, dizziness, nausea and/or vomiting, pain
SECONDARY
The primary endpoint of this study was the time of first postoperative flatus. Secondary endpoints were anaesthesia resuscitation time, postoperative first feeding time, postoperative nausea and/or vomiting (PONV) incidence, dizziness, postoperative numerical rating scale (NRS) of pain and hospital days postoperatively. All these data were collected by anaesthesia nurses blinded to the subgroups.Resuscitation time was defined as the time between cessation of anaesthetic drug infusion and removal of the laryngeal mask. Postoperative feeding time was defined as the time between the patient’s return to the ward and the time of semi-liquid postoperative feeding. PONV was defined as the occurrence of nausea and/or vomiting from the end of surgery to postoperative day 2. The follow-up nurse assessed the patient’s pain on postoperative days 1, 2, and 3 at 4 pm and recorded the patient’s pain NRS score (0 = no pain, 10 = the most severe pain) at the follow-up visit.In addition to the primary and secondary endpoints of the study, the patients’ general information (age, height, weight, ASA classification, smoking history and history of previous abdominal surgery), intraoperative conditions (operative time, anaesthesia time, intraoperative sufentanil consumption, intraoperative remifentanil consumption, intraoperative fluid volume, intraoperative blood transfusion and intraoperative urine volume), type of surgery and postoperative recovery (mental status and analgesic rescue) were collected. Mental status was only subjectively assessed based on family members’ reports on whether the patient’s mental status changed before and after surgery. The analgesic rescue was recorded irrespective of whether it was applied or not but the type and dose of medication were not recorded.