Outcomes and data collection
loss of consciousness
RESPIRATORY COMPLICATIONS, COMPLICATIONS
The demographic and hospital characteristics of the patients, such as age, body mass index, gender, coexisting medical conditions, type of operation (laparotomy or laparoscopy) were all recorded. Intraoperative data on the procedure and anesthesia were recorded, including time of induction of anesthesia (midazolam start time), time of start of operation (skin cut time), MAP and heart rate at all key intraoperative time points (baseline, at loss of consciousness, skin cut, every 30 min during the operation, at end of operation), time of end of operation (time of last suture) and time of end of anesthesia (propofol stop time). Intraoperative dose of maintenance (propofol, remifentanil) and additional drugs (sufentanil, cisatracurium), record of vasoactive drug use, time of patient admission to PACU and time of discharge from PACU. Patients were assessed for the occurrence of major organ system complications during hospitalization, postoperative length of stay and 30-day postoperative all-cause mortality. In the present study, the primary outcomes of interest were systemic complications within the hospitalization after surgery. Systemic complications were divided into respiratory complications [