Initial Experience of Self-Expanding Metal Ureteral Stent in Recurrent Ureteral Stricture After Ureteroplasty

Background: The aim of this prospective study was to assess the safety and effectiveness of self-expanding metal ureteral stent (MUS) for the treatment of recurrent ureteral stricture after ureteroplasty.Methods: We prospectively included 24 patients who underwent MUS implantation between February 2019 and August 2020. The inclusion criteria for the procedure were recurrent ureteral strictures after ureteroplasty. A paired T test was used to compare continuous variables before and after surgery.Results: A total of 24 patients were finally included in this study. The stricture site was most common on the proximal ureter 19 (79.2%), followed by distal ureter 4 (16.7%) and middle ureter 1 (4.2%). The median length of ureteral stricture is 2.5 (range 1–18) cm. The median operative time was 51.5 min, and the median hospital stay time after surgery was 3 days. Post-operative complication included pain 1 (4.2%), urinary tract infection 2 (8.3%) and hematuria 2 (8.3%). After a median follow-up of 12 months, 19/24 (83.3%) patients were clinically and radiologically successful. We endoscopically adjusted or exchanged the failed stents. The volume of hydronephrosis (124.7 ± 132.5 vs. 66.4 ± 73.2 cm3, P = 0.015), blood creatinine level (104.5 ± 45.4 vs. 80.1 ± 23.2 μmol/L, P = 0.044) and urea nitrogen level (6.9 ± 2.4 vs. 4.8 ± 1.5 mmol/L, P = 0.003) decreased significantly after a median follow-up of 12 months.Conclusions: MUS is a safe and effective way to manage recurrent ureteral strictures after ureteroplasty. This technique provides a new choice for the treatment of recurrent stricture.

P-BN53 The ‘Difficult Gallbladder’: do no harm!

Background Laparoscopic cholecystectomy (LC) for a ‘difficult gallbladder’ can incur increased risk of biliary complications. In these challenging conditions where anatomical delineation (commonly through the critical view of safety) is unachievable, it is important to recognise when to proceed and when to consider a bail-out strategy. Subtotal cholecystectomy (SC), cholecystostomy insertion, conversion to open or abandoning the procedure are accepted solutions. In this study we review the outcomes of patients who underwent LC following previous intervention. Methods We retrospectively reviewed patients who underwent LC under a single surgeon between January 2009 to July 2020 following a previous intervention with LC, SC or cholecystostomy tube insertion. Data was collected with regards to demographics, clinical presentation, intraoperative details, imaging, conversion to open, length of hospital stay and complications. Results 40 patients with previous intervention underwent LC. Previous intervention included abandoned LC in 24(60%), on-table cholecystostomy in 8 (20%) and SC in 8 (20%), with 5(13%) converted to open. Reasons for referral included adhesions, intrahepatic gallbladder, possible malignancy, empyema and abnormal anatomy. Laparoscopic approach attempted in 39/40 (98%), conversion to open in 25%. Reasons for conversion included cholecystoduodenal fistula, and suspected malignancy. Median hospital stay was 4 days (1 – 22). Morbidity was seen in 2(4%) with no biliary complications. Completion of treatment, from previous intervention to definitive LC was 9 months (1-48). Conclusions In patients with previously attempted cholecystectomy, LC is feasible and can be performed with low morbidity. When faced with a difficult gallbladder intra-operatively, aborting the procedure and re-attempting at a later date, locally or referral to a specialist Unit, should be considered.

Comparison of Staging Laparoscopy for Peritoneal Metastases with or without Pressurized Intra-Peritoneal Aerosol Chemotherapy (PIPAC)

Background Pressurized intraperitoneal aerosol chemotherapy (PIPAC) has been introduced for palliative treatment of peritoneal cancer (PC) and is currently tested also in the neoadjuvant and prophylactic setting. The aim was therefore to compare safety and tolerance of staging laparoscopy with or without PIPAC. Methods This retrospective analysis compared consecutive patients undergoing staging laparoscopy alone for oesogastric cancer with patients having PIPAC for suspected PC of various origins from January 2015 until January 2020. Safety was assessed by use of the Clavien classification for complications and CTCAE for capturing of adverse events. Pain and nausea were documented by use of a visual analogue scale (VAS: 0-10: maximal intensity). Results Overall, 25 PIPAC procedures were compared to 24 in the laparoscopy group. PIPAC procedures took a median of 35 min (IQR: 25-67) longer. Four patients experienced at least one complication in either (p=0.741). No differences were noted for postoperative nausea (p=0.961) and pain levels (p=0.156). Median hospital stay was 2 (IQR: 1-3) for PIPAC and 1 (IQR: 1-2) for the laparoscopy group (p=0.104). Conclusions The addition of PIPAC did not jeopardize safety and postoperative outcomes of staging laparoscopy alone. Further studies need to clarify its oncological benefits.

Effect of COVID-19 pandemic on hip preservation surgery—a prospective surveillance from the UK Non-Arthroplasty Hip Registry

ABSTRACT A multi-centre, registry-based cohort study was conducted to assess the effect of the coronavirus disease 2019 (COVID-19) pandemic on the provision of non-arthroplasty hip surgery (NAHS) in the UK by (i) comparing the number of NAHS performed during the pandemic to pre-pandemic levels, (ii) prospectively auditing compliance to established guidance and (iii) evaluating post-operative outcomes and their predictors. Patients who underwent NAHS during the pandemic/pre-pandemic were selected from the Non-Arthroplasty Hip Registry, which collects demographic, procedural and pre-operative outcome data. Patients during the pandemic period were emailed separate COVID-19 surveillance questionnaires, which evaluated adherence to guidelines and post-operative outcomes. Fisher’s exact tests and logistic regression were used to identify predictors for developing COVID-19 and being re-admitted into hospital, post-surgery. There was a 64% reduction of NAHS performed during the pandemic compared to the pre-pandemic period. Ninety-nine percent of participants self-isolated, and 96.8% received screening, pre-operatively. No participant was COVID-19-positive peri-operatively. Post-operatively, participants had an intensive care unit admission rate of 2%, median hospital stay of 1 day, hospital readmission rate of 4.2%, COVID-19 development rate of 2.3% and a thromboembolic complication rate of 0.32%. No COVID-19-positive patient developed adverse post-operative outcomes. Participants who developed COVID-19 post-operatively had greater odds of having undergone osteotomy in comparison to arthroscopic surgery (P = 0.036, odds ratio = 5.36). NAHS was performed with good compliance to established guidance, and adverse operative outcomes remained low. If guidance is followed, the risk of COVID-19 post-op development is low. Although bigger operations have a slightly higher risk, this does not impact their prognosis.

788. Enterobacter cloacae Infection Characteristics and Outcomes in Military Personnel who Sustained Trauma in Iraq and Afghanistan

Background Enterobacter cloacae is a Gram-negative rod with chromosomally-induced Amp-C β-lactamase with multidrug-resistant potential. Joint Trauma System guidelines for treating combat wounds include prophylaxis with cefazolin and ertapenem, potent inducers of Amp-C. We evaluated clinical characteristics, antibiotic utilization, and outcomes associated with battlefield-related E. cloacae infections. Methods All initial solitary (those with single isolates) and serial E. cloacae isolates (≥24 hours from initial isolate from any site) were collected from the Trauma Infectious Disease Outcomes Study (6/2009-12/2014). Inclusion required E. cloacae isolation from a clinical infection. Amp-C-inducing β-lactams were classified based on induction potential and lability to the Amp-C β-lactamase as Amp-C induction levels. Results Of 653 E. cloacae isolates, 253 met inclusion criteria – 64 patients had only initial isolates, 54 patients had serial isolates. Patients were largely male (99%), median age 23 years (IQR 21-27), with injury severity score of 34 (IQR 24-45). Initial isolates were wound (70%), respiratory (22%), blood (7%), urine (1%), and other (1%). Patients commonly had blast injuries (89%), required ICU admission (95%), and had a median hospital stay of 57 days (IQR 39-82). Patients with serial isolates showed a trend towards earlier clinical infection (5 vs 8 days, P = 0.07). They were also less likely to receive carbapenems prior to E. cloacae isolation compared to those with only initial isolates (4% vs 38%) and more likely to receive 1st generation cephalosporins (79% vs 58%, P = 0.01). The serial isolate group received more days of 1st generation cephalosporins (median 6 days vs 2.5 days, P = 0.01). Cumulative antimicrobial therapy trended towards significance and was greater with the serial isolates (median 100 days vs 74 days, P = 0.08). There was no difference in number of surgical interventions between those with and without serial isolates (P = 0.54). Overall, 6 patients died. Conclusion E. cloacae infections after battlefield trauma were frequently encountered and associated with exposure to 1st generation cephalosporins. Serial infections did not correlate to worse patient outcomes but displayed a trend towards an overall greater duration of antibiotic use. Disclosures William N. Bennett, V, MD, Abbvie (Shareholder)Amgen (Shareholder)Nabriva (Shareholder)

617. Long Acting Lipoglycopeptide Use in Veterans for Serious Gram-Positive Infections in the COVID Era

Background Dalbavancin and Oritavancin are semisynthetic lipoglycopeptides (LGP) that are FDA-approved for treatment of skin and soft tissue infections, but emerging data supports LGP use for other serious gram positive (GP) infections. We describe our experience with LGP during the COVID-19 pandemic. Methods We initiated a quality improvement project to assess the use of LGP for label and off-label indications at the Atlanta Veterans Affairs Health Care System. We define serious GP infections as infective endocarditis, osteomyelitis, joint infections, or bacteremia. Patients with serious GP infections that receivedLGP were selected at the treating physician's discretion. We reviewed medical records of all patients receiving at least one dose of long-acting LGP from March 1, 2020 - May 31, 2021. We described patient demographics, clinical information,and outcomes (90-day readmission). Results Nineteen patients with GP infections received LGP (table). Overall, the most common infection was cellulitis 7 (35%); 14 patients received LGPs for serious GP infections. All patients received at least one other non-LGP antibiotic for at least 2 days, majority vancomycin (60%) and cefazolin (30%). Overall, the median hospital stay among patients who received LGP was 8.5 days (range: 2-45 days), for those with serious GP infections the median hospital stay was 15 days (range: 4-45). 90% of patientswho received LGP were discharged home. Number of LGP doses ranged from 1 to 6 doses total, based on type of infection. Sixteen veterans (80%) followed up in outpatient clinicfollowing discharge within 2 weeks, two patients were discharged to home hospice due to complications of underlying malignancies and two patients were lost to follow up. Noadverse drug events were reported, and none with serious GP infections required rehospitalization at 90 days. Conclusion Our experience suggests that long-acting LGP may be valuable tools to treat serious gram-positive infections by optimizing theduration of hospitalization and preventing unnecessary admissions to acute care and nursing facilities for daily antibiotic infusions. These aspects of LGP use are especially important during the COVID-19 pandemic where nosocomial transmission has been documented. Disclosures All Authors: No reported disclosures

552 A Single Centre Retrospective Study of Outcomes in Open Liver Surgery

Aim Despite advances in laparoscopic surgery for liver resections, an open approach remains the most frequent approach for complex liver resections for benign and malignant conditions. The aim of this study was to evaluate the clinical outcomes of patients undergoing open liver resections at a single tertiary HPB centre. Method All patients undergoing open liver resections between March 2018-July 2020 were included. Clinical and pathological data was reviewed for all patients and data collected including demographics, indication for surgery, complications, length of hospital stay and 30- and 90-day mortality. Results A total of 51 patients underwent open liver resection with median age of 65 (IQR 60.5-70.5). Indication for surgery included CRC metastasis (45%), HCC (27%), Intrahepatic cholangiocarcinoma (8%), Cholangiocarcinoma (8%), other metastasis (8%). The median hospital stay was 8 days (IQR 6-15). Complications were noted in 17 patients (Clavien-Dindo Classification III (8%) and IV (12 %). 6 patients had post op bile leaks, 4 with grade B and 2 with grade C bile leaks. 8 patients had post hepatectomy liver failure (5 Grade A, 2 Grade B, 3 Grade C). No mortality was noted at 30 and 90-day time-points. Conclusions Our outcomes in terms of morbidity, mortality and hospital length of stay are similar to that in published literature.

A Comparative Study on flap necrosis following Karydakis Flap Reconstruction and Z-Plasty in Patients with Sacrococcygeal Pilonidal Disease – Our experience

Aim: The purpose of this study was to evaluate patients with sacrococcygeal pilonidal sinus disease(SPSD) who underwent the Karydakis procedure and Z plasty at our centre concerning theperioperative findings, late postoperative results and recurrence. Patients and Methods: A total of30 patients presenting with SPSD at our centre underwent Karydakis flap repair and Z plasty fromMay 2019 to June 2021. These patients were then followed up and evaluated concerning operativetime, drain use, hospital stay, suture removal, complications, and recurrence. The adipocutaneousflap of Karydakis was devised to shift the natal cleft, while Z-plasty involves a fasciocutaneous flap.Results: The mean operative time was 60 min with a median hospital stay of 4 days. Drains wereremoved at a median of 5 days and sutures at a median of 15 days. The duration of hospitalisationfor the Karydakis procedure was found significantly lesser than that for Z-plasty Patients who werefollowed up for a median of 12 months. The overall complications were more in Z-plasty. Flapnecrosis developed in 30 % of the cases in the Z-plasty group, comparable to no recurrence seen inthe Karydakis procedure. Conclusion: Karydakis flap was found superior to Z-plasty, having lessseroma formation, no flap necrosis and no local hematoma Karydakis flap procedure is a relativelysimple procedure for SPSD and has advantages over Z-plasty technique like keeping scar away fromthe midline and flattening of the natal cleft, thus reducing local recurrence rates.

Risk identification and technical modifications reduce the incidence of post-cholecystectomy bile leakage: analysis of 5675 laparoscopic cholecystectomies

Purpose The main sources of post-cholecystectomy bile leakage (PCBL) not involving major duct injuries are the cystic duct and subvesical/hepatocystic ducts. Of the many studies on the diagnosis and management of PCBL, few addressed measures to avoid this serious complication. The aim of this study was to examine the causes and mechanisms leading to PCBL and to evaluate the effects of specific preventative strategies. Methods A prospectively maintained database of 5675 consecutive laparoscopic cholecystectomies was analysed. Risk factors for post-cholecystectomy bile leakage were identified and documented and technical modifications and strategies were adopted to prevent this complication. The incidence, causes and management of patients who suffered bile leaks were studied and their preoperative characteristics, operative data and postoperative outcomes were compared with patients where potential risks were identified and PCBL avoided and with the rest of the series. Results Twenty-five patients (0.4%) had PCBL (7 expected and less than half requiring reintervention): 11 from cystic ducts (0.2%), 3 from subvesical ducts (0.05%) and 11 from unconfirmed sources (0.2%). The incidence of cystic duct leakage was significantly lower with ties (0.15%) than with clips (0.7%). Fifty-two percent had difficulty grades IV or V, 36% had empyema or acute cholecystitis and 16% had contracted gallbladders. Twelve patients required 17 reinterventions before PCBL resolved; 7 percutaneous drainage, 6 ERCP and 4 relaparoscopy. The median hospital stay was 17 days with no mortality. Hepatocystic ducts were encountered in 72 patients (1.3%) and were secured with loops (54.2%), ties (25%) or sutures (20.8%) with no PCBL. Eighteen sectoral ducts were identified and secured. Conclusion Ligation of the cystic duct reduces the incidence of PCBL resulting from dislodged endoclips. Careful blunt dissection in the proper anatomical planes avoiding direct or thermal injury to subvesical and sectoral ducts and a policy of actively searching for hepatocystic ducts during gallbladder separation to identify and secure them can reduce bile leakage from such ducts.

Radical Hemiscrotectomy and En Bloc Orchidectomy: Surgical Technique and Perioperative and Oncologic Outcomes of a Supra-Regional UK Referral Centre

Background and Purpose Hemiscrotectomy with en bloc orchidectomy represents a radical primary, completion, or salvage option in men with inguinoscrotal cancers. We describe our surgical technique and peri-operative and oncological outcomes. Patients and Methods Retrospective cohort study of 16 men treated at a supra-regional referral centre with open radical hemiscrotectomy with or without en bloc orchidectomy between 2010 and 2020. Peri-operative and survival outcomes were analysed. Results Radical hemiscrotectomy with or without en bloc orchidectomy was performed on 16 patients comprising 7 well-differentiated liposarcomas, 4 dedifferentiated liposarcomas, 2 leiomyosarcomas, 1 mesothelioma, 1 rhabdomyosarcoma and 1 mammary type myofibroblastoma. Primary hemiscrotectomy was performed in four, completion hemiscrotectomy in nine and salvage hemiscrotectomy in three. The median hospital stay was 2 days [interquartile range (IQR) 2–4]. Four patients (25%) had post-operative complications including wound infection or haematoma. During a median follow-up of 18 months (IQR 2–66), one patient (6%) died following a recurrence in the pelvis and retroperitoneum. Discussion and Conclusions If careful dissection is performed, radical hemiscrotectomy and en bloc orchidectomy is a radical but safe procedure with a short hospital stay. Haematoma and infection represent the main complications, and within limited follow-up most men showed no recurrence.