Perioperative Endothelial Dysfunction in Patients Undergoing Major Acute Abdominal Surgery (POETRYabd)

Inclusion criteria

• ≥ 18 years old
• Surgery within 72 hours of an acute admission to the Department of Surgery or an acute reoperation.
• Major gastrointestinal surgery on the gastrointestinal tract. This will include
• Open, laparoscopic, or laparoscopically-assisted procedures
• Procedures involving the stomach, small or large bowel, or rectum for conditions such as perforation, ischaemia, abdominal abscess, bleeding or obstruction
• Washout/evacuation of intra-peritoneal abscess (unless due to appendicitis or cholecystitis - excluded, see below)
• Washout/evacuation of intra-peritoneal hematoma
• Bowel resection/repair due to incarcerated umbilical, inguinal and femoral hernias (but not hernia repair without bowel resection/repair)
• Bowel resection/repair due to obstructing/incarcerated incisional hernias provided the presentation and findings were acute
• Laparotomy/laparoscopy with inoperable pathology (e.g. peritoneal/hepatic metastases)
• Laparoscopic/Open Adhesiolysis
• Return to theatre for repair of fascial dehiscence
• Any reoperation/return to theatre meeting the criteria above is included

If multiple procedures (primary surgery or reoperation) are performed on different anatomical sites within the abdominal/pelvic cavity, the patient would be included if the major procedure is general surgical.

Exclusion criteria

• Not capable of giving informed consent after oral and written information
• Previously included in the trial
• If transferred directly from the operation room or recovery ward to the intensive care unit
• Elective laparoscopy
• Diagnostic laparotomy/laparoscopy where no subsequent procedure is performed (NB, if no procedure is performed because of inoperable pathology, then include)
• Appendectomy +/- drainage of localized collection unless the procedure is incidental to a non-elective procedure on the GI tract
• Cholecystectomy +/- drainage of localized collection unless the procedure is incidental to a non-elective procedure on the GI tract (All surgery involving the appendix or gallbladder, including any surgery relating to complications such as abscess or bile leak is excluded)
• Non-elective hernia repair without bowel resection.
• Minor abdominal wound dehiscence unless this causes bowel complications requiring resection
• Ruptured ectopic pregnancy, or pelvic abscesses due to pelvic inflammatory disease
• Laparotomy/laparoscopy for pathology caused by blunt or penetrating trauma
• Laparotomy/laparoscopy for esophageal pathology Laparotomy/laparoscopy for pathology of the spleen, renal tract, kidneys, liver, gall bladder and biliary tree, pancreas or urinary tract