BACKGROUND: Intraoperative conversion to open surgery is an adverse event during minimally invasive distal pancreatectomy (MIDP), associated with poor postoperative outcomes. The aim of this study was to develop a model capable of predicting conversion in patients undergoing MIDP.
METHODS: A total of 352 patients who underwent MIPD were included in this retrospective analysis and randomly assigned to training and validation cohorts. Potential risk factors related to open conversion were identified through a literature review, and data on these factors in our cohort was collected accordingly. In the training cohort, multivariate logistic regression analysis was performed to adjust the impact of confounding factors to identify independent risk factors for model building. The constructed model was evaluated using the receiver operating characteristics curve, decision curve analysis (DCA), and calibration curves.
RESULTS: Following an extensive literature review, a total of ten preoperative risk factors were identified, including sex, BMI, albumin, smoker, size of lesion, tumor close to major vessels, type of pancreatic resection, surgical approach, MIDP experience, and suspicion of malignancy. Multivariate analysis revealed that sex, tumor close to major vessels, suspicion of malignancy, type of pancreatic resection (subtotal pancreatectomy or left pancreatectomy), and MIDP experience persisted as significant predictors for conversion to open surgery during MIDP. The constructed model offered superior discrimination ability compared to the existing model (area under the curve, training cohort: 0.921 vs. 0.757, P < 0.001; validation cohort: 0.834 vs. 0.716, P = 0.018). The DCA and the calibration curves revealed the clinical usefulness of the nomogram and a good consistency between the predicted and observed values.
CONCLUSIONS: The evidence-based prediction model developed in this study outperformed the previous model in predicting conversions of MIDP. This model could contribute to decision-making processes surrounding the selection of surgical approaches and facilitate patient counseling on the conversion risk of MIDP.

OBJECTIVE: This study aimed to compare the outcomes of robotic-assisted rectal resection with conventional laparoscopic and open approaches, focusing on complication rates, conversion rates, length of hospital stay, and oncologic outcomes.
METHODS: A retrospective single-center cohort study included 106 patients with non-metastatic rectal cancer (UICC stages I-III) who underwent rectal resection from January 2013 to December 2023. Patients were assigned to open surgery (n = 23), conventional laparoscopic surgery (n = 55), or robotic-assisted surgery (n = 28).
RESULTS: Robotic surgery demonstrated significantly lower conversion rates compared to minimal-invasive surgeries (p = 0.047) and shorter hospital stays (11.5 ± 8 days) compared to open (17.91 ± 12 days) and laparoscopic (17.2 ± 14 days) surgeries (p = 0.001). The quality of the specimen was significantly better (Score 1) in robotic (85.71%) and open (89.09%) cases compared to laparoscopic approaches (47.83%) (p < 0.001). Laparoscopic surgery was identified as a risk factor for worse specimen quality (p < 0.001). Older patients (> 63 years) had a higher risk for conversion in univariate analysis (p = 0.049). Morbidity was comparable between the groups (p = 0.131), and the anastomotic leakage rate did not differ significantly (laparoscopic: 18.18%, open: 13.04%, robotic: 17.86%). Kaplan-Meier survival curves showed no significant differences in overall survival probabilities among the groups.
CONCLUSIONS: Robotic-assisted rectal resection provides significant advantages in terms of lower conversion rates, better specimen quality, and shorter hospital stays while maintaining comparable complication rates and oncologic outcomes to conventional laparoscopic and open approaches. These findings support robotic surgery as a standard treatment option for rectal cancer.

OBJECTIVE: To assess the rate at which sutureless partial nephrectomy (SLPN) transitions to standard partial nephrectomy (SPN), focusing on preoperative factors that might prompt such conversions.
METHODS: In this retrospective study, we analyzed the efficacy of SLPN performed on adults at our institution from 2016 to 2023. The subjects were patients diagnosed with localized solid renal tumors. The primary technique employed was resection with scissors and argon beam coagulation for hemostasis, with suturing techniques used only when necessary. Predictive factors necessitating conversion to SPN were identified, and the associations among multiple variables were explored using various statistical analysis methods, including logistic regression, to identify key preoperative predictive factors.
RESULTS: Our institution performed 353 SLPN, with 21 cases (5.9%) necessitating conversion to SPN. The conversion rates for the Laparoscopic Partial Nephrectomy (LPN) subgroup and the Robotic-assist Partial Nephrectomy (RPN) subgroup were 7.9% (17/215) and 2.9% (4/138), respectively, nearing statistical significance (P = .066). Significant differences were observed between the conversion group and the no conversion group in terms of preoperative estimated Glomerular Filtration Rate (eGFR), age at surgery, tumor size, and exophytic/endophytic characteristics. Multivariate analysis identified age at surgery, preoperative eGFR, radiological tumor size, and tumor exophytic/endophytic nature as significant predictors for conversion to SPN.
CONCLUSIONS: This investigation highlights the efficacy and feasibility of SLPN while identifying critical factors influencing the necessity for conversion to SPN. The identified predictors, including younger surgical age, superior preoperative eGFR, and specific tumor characteristics, provide valuable insights for refining surgical strategies.

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The robotic approach improves the feasibility of minimally invasive colectomy even where there may be an anatomic challenge with laparoscopy. Whether a failure in completing colectomy with this newer technology is associated with worse consequences needs to be considered when evaluating the relative benefit of robotic colectomy. The aim of this study is to evaluate rates of conversion to open surgery after robotic and laparoscopic colectomy and whether outcomes after conversion vary after the two techniques since this has not been well studied. From the American College of Surgeons (ACS) - National Surgical Quality Improvement Program (NSQIP) (2015-2016), patients who underwent elective minimally invasive colectomy were identified. Converted robotic were compared to laparoscopic procedures for patient demographics, co-morbidities; primary procedure and diagnosis, prolonged operation and postoperative complications. Of 36,046 colectomy procedures, 30,808 (85.5%) were laparoscopic, while 5238 (14.5%) were robotic-assisted. There were 3271 (9.1%) conversions to open surgery (laparoscopic: 2959 [9.6%]; robotic: 312 [6%]). Thirty-day postoperative surgical site infection, anastomotic leak, ileus, sepsis, bleeding requiring transfusion, urinary tract infection, reoperation; pulmonary, renal, cardiac/cerebrovascular complications; readmission, hospital stay, and mortality, were similar between the two groups. However, deep vein thrombosis/pulmonary embolism was higher after robotic conversion (4.5% vs. 2.2%, p = 0.01). Conversion was lower after robotic when compared to laparoscopic colectomy. Converted patients had similar outcomes except for vein thromboembolism which was higher after robotic surgery. Robotic technology seems to improve the feasibility of minimally invasive surgery without negatively affecting safety and efficacy even when conversion is required.

BACKGROUND: Gallbladder perforations are challenging to manage for surgeons due to their high morbidity and mortality, rarity, and surgical approach. Laparoscopic cholecystectomy (LC) is now included with open cholecystectomy in surgical managing gallbladder perforations. This study aimed to evaluate the factors affecting conversion from laparoscopic to open cholecystectomy in cases of type I gallbladder perforation according to the Modified Niemeier classification.
METHODS: Patients who met the inclusion criteria were divided into two groups: LC and conversion to open cholecystectomy (COC). Demographic, clinical, radiologic, intraoperative, and postoperative factors were compared between groups.
RESULTS: This study included 42 patients who met the inclusion criteria, of which 28 were in the LC group and 14 were in the COC group. Their median age was 68 (55-85) years. Age did not differ significantly between groups (p = 0.218). However, the sex distribution did differ significantly between groups (p = 0.025). The location of the perforation differed significantly between groups (p < 0.001). In the LC group, 22 patients were perforated from the fundus, four from the trunk, and two from the neck. In the COC group, two patients were perforated from the fundus, four from the trunk, and eight from the neck. Surgical procedure times differed significantly between the LC (105.0 min [60-225]) and COC (125.0 min [110-180]) groups (p = 0.035). The age of the primary surgeons also differed significantly between the LC (42 years [34-63]) and COC (55 years [36-59]) groups (p = 0.001).
CONCLUSIONS: LC can be safely performed for modified Niemeier type I gallbladder perforations. The proximity of the perforation site to Calot\'s triangle, Charlson comorbidity index (CCI), and Tokyo classification are factors affecting conversion from laparoscopic to open surgery of gallbladder perforations.

BACKGROUND: The aim of this study is to evaluate morbidity and mortality in patients taken to conversion to open procedure (CO) and subtotal laparoscopic cholecystectomy (SLC) as bailout procedures when performing difficult laparoscopic cholecystectomy.
METHODS: This observational cohort study retrospectively analyzed patients taken to SLC or CO as bailout surgery during difficult laparoscopic cholecystectomy between 2014 and 2022. Univariable and multivariable logistic regression models were used to identify prognostic factors for morbimortality.
RESULTS: A total of 675 patients were included. Of the 675 patients (mean [SD] age 63.85 ± 16.00 years; 390 [57.7%] male) included in the analysis, 452 (67%) underwent CO and 223 (33%) underwent SLC. Overall, neither procedure had an increased risk of major complications (89 [19.69%] vs 35 [15.69%] P.207). However, CO had an increased risk of bile duct injury (18 [3.98] vs 1 [0.44] P.009), bleeding (mean [SD] 165.43 ± 368.57 vs 43.25 ± 123.42 P < .001), intestinal injury (20 [4.42%] vs 0 [0.00] P.001), and wound infection (18 [3.98%] vs 2 [0.89%] P.026), while SLC had a higher risk of bile leak (15 [3.31] vs 16 [7.17] P.024). On the multivariable analysis, Charlson comorbidity index (odds ratio [OR], 1.20; CI95%, 1.01-1.42), use of anticoagulant agents (OR, 2.56; CI95%, 1.21-5.44), classification of severity of cholecystitis grade III (OR, 2.96; CI95%, 1.48-5.94), and emergency admission (OR, 6.07; CI95%, 1.33-27.74) were associated with presenting major complications.
CONCLUSIONS: SLC was less associated with complications; however, there is scant evidence on its long-term outcomes. Further research is needed on SLC to establish if it is the safest in the long-term as a bailout procedure.

BACKGROUND: We assessed feasibility and safety of laparoscopic sigmoidectomy for complicated fistulizing diverticular disease in a tertiary care colorectal center.
METHODS: A single-center retrospective study of patients undergoing sigmoidectomy for fistulizing diverticular disease between 2011 and 2021 was realized. Primary outcomes were rates of conversion to open surgery and severe postoperative morbidity at 30 days. Secondary outcomes included rates of postoperative bladder leaks on cystogram.
RESULTS: Among the 104 patients, 32.7% had previous laparotomy. Laparoscopy was the initial approach in 103 (99.0%), with 6 (5.8%) conversions to laparotomy. Clavien-Dindo grade ≥ III complication rate at 30 days was 10.6%, including two (1.9%) anastomotic leaks. The median postoperative length of stay was 4.0 days. Seven (6.7%) patients underwent reoperation, six (5.8%) were readmitted, and one (0.9%) died within 30 days. Twelve (11.5%) ileostomies were created initially, and two (1.9%) were created following anastomotic leaks. At last follow-up, 101 (97.1%) patients were stoma-free. Urgent surgeries had a higher rate of severe postoperative complications. Among colovesical fistula patients (n = 73), postoperative cystograms were performed in 56.2%, identifying two out of the three bladder leaks detected on closed suction drains. No differences in postoperative outcomes occurred between groups with and without postoperative cystograms, including Foley catheter removal within seven days (73.2% vs. 90.6%, p = 0.08).
CONCLUSIONS: Laparoscopic surgery for complicated fistulizing diverticulitis showed low rates of severe complications, conversions to open surgery and permanent stomas in high-volume colorectal center.

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