This was a retrospective study including consecutive adult patients who underwent minimally invasive (laparoscopic or robotic) surgery for IBD from 01/11/2017 to 15/04/2024 at our institution. The data was retrieved from a prospectively maintained database hosted on the Alma Mater Studiorum University of Bologna REDCap (Research Electronic Data Capture) platform 12. The robotic series started in July 2023. There was no preoperative selection of patients who underwent robotic surgery, as factors such as the operating room availability and the waiting list primarily determined the approach. Patients younger than eighteen years old, without a histologic diagnosis of IBD, and who underwent oncologic or emergent surgery were excluded from the analysis. All procedures were performed by a single surgeon with a large experience in laparoscopic surgery for IBD (> 500 laparoscopic procedures), and who was robotic-naïve. The surgeon underwent the required certification for using the robotic platform and previously performed 20 other robotic procedures (colorectal non-IBD, cholecystectomies). Robotic procedures were performed using the Medtronic Hugo™ RAS platform (Medtronic, Minneapolis, MN, USA).
The primary outcome was the comparison of the 30-day overall postoperative complication rate. The secondary outcomes included the comparison of the operative time, conversion rate, intraoperative complications, length of hospital stay, and readmission rate.
The analyzed variables included demographics, age, sex, body mass index (BMI), smoking, American Society of Anesthesiologist (ASA) score, preoperative medical therapy (including steroid, immunomodulator or biologics), serum albumin, hemoglobin, C-reactive protein, preoperative antibiotics, preoperative drainage of intra-abdominal collection, preoperative nutritional parenteral nutrition, previous abdominal surgery, indication for surgery, conversion (considered as a laparotomy created for any purpose other than specimen extraction) 13, associated surgical procedures, intra-corporeal anastomosis (ICA) construction, intraoperative complications, operative time, postoperative length of stay and readmission. CD-specific characteristics, such as CD duration, CD age, CD behavior according to the Montreal classification, anoperineal disease, and complex CD (defined as the presence of an intraoperative intra-abdominal abscess, fistula, or inflammatory mass) were also collected. No modification has been made in the preoperative optimization between the two groups according to bowel preparation, medical therapy suspension, preoperative sepsis treatment14–18. The postoperative complications were categorized according to the Clavien-Dindo classification 19. The diagnosis of anastomotic leak (AL) was based on the validated definition proposed by the International Study Group of Rectal Cancer (ISREC), which considered AL also the pelvic abscesses located in the proximity of the anastomosis, whether or not the origin is detectable 20.
The study was conducted according to the Declaration of Helsinki guidelines and the Ethical Committee approval was obtained. The manuscript was structured according to the STROBE cohort reporting guidelines 21. Statistical analysis was conducted using R4.3.2 22. The continuous variables were summarized as median [IQR], and categorical variables were reported as frequency (percentage). Continuous variables were compared between the robotic group (RG) and laparoscopic group (LG) using the Wilcoxon rank sum test, and categorical variables were compared using the Chi-squared or Fisher’s exact test, as appropriate. All tests were two-sided; a significant difference was considered with an alpha level < 0.05.