Progress and Current Limitations of Materials for Artificial Bile Duct Engineering

Bile duct injury (BDI) and bile tract diseases are regarded as prominent challenges in hepatobiliary surgery due to the risk of severe complications. Hepatobiliary, pancreatic, and gastrointestinal surgery can inadvertently cause iatrogenic BDI. The commonly utilized clinical treatment of BDI is biliary-enteric anastomosis. However, removal of the Oddi sphincter, which serves as a valve control over the unidirectional flow of bile to the intestine, can result in complications such as reflux cholangitis, restenosis of the bile duct, and cholangiocarcinoma. Tissue engineering and biomaterials offer alternative approaches for BDI treatment. Reconstruction of mechanically functional and biomimetic structures to replace bile ducts aims to promote the ingrowth of bile duct cells and realize tissue regeneration of bile ducts. Current research on artificial bile ducts has remained within preclinical animal model experiments. As more research shows artificial bile duct replacements achieving effective mechanical and functional prevention of biliary peritonitis caused by bile leakage or obstructive jaundice after bile duct reconstruction, clinical translation of tissue-engineered bile ducts has become a theoretical possibility. This literature review provides a comprehensive collection of published works in relation to three tissue engineering approaches for biomimetic bile duct construction: mechanical support from scaffold materials, cell seeding methods, and the incorporation of biologically active factors to identify the advancements and current limitations of materials and methods for the development of effective artificial bile ducts that promote tissue regeneration.

Modified median hepatic fissure approach for resection of liver tumours located in the angle between the root of the middle and right hepatic veins

Background Liver tumours between the root angle of the middle and right hepatic veins are a special type of liver segment VIII tumour. In this study, we designed a modified median hepatic fissure approach to remove these tumours. The safety and effectiveness of the approach were evaluated. Materials and methods From April 2015 to November 2019, 11 patients with liver tumours between the angle of the middle and right hepatic veins underwent this modified median hepatic fissure approach. We retrospectively analysed data from the perioperative periods of these 11 patients, including general condition, operation time, intraoperative bleeding, and postoperative complications. Disease-free survival and overall survival were assessed. Results Of the 11 patients, 9 patients had primary hepatocellular carcinoma and 2 had colorectal liver metastases. The average intraoperative blood loss was 285 mL (150–450 mL). Two patients developed postoperative bile leakage, but there were no significant serious complications, such as intraabdominal bleeding and liver failure, in any of the patients. The liver function returned to the normal range on the 5th day after surgery. Of the 11 patients, 5 have survived for more than 3 years (45.5%), and 4 have been disease-free for more than 3 years (36.3%). Conclusions For liver tumours between the root angle of the middle and right hepatic veins, the modified median hepatic fissure approach is a safe and feasible method.

Meta-Analysis of Risk Factors for Bile Leakage After Hepatectomy Without Biliary Reconstruction

Background and Aim: The risk factors for bile leakage after hepatectomy without biliary reconstruction are controversial. This study investigated the risk factors for bile leakage after hepatectomy without biliary reconstruction.Methods: We searched databases (Embase (Ovid), Medline (Ovid), PubMed, Cochrane Library, and Web of Science) for articles published between January 1, 2000, and May 1, 2021, to evaluate the risk factors for bile leakage after hepatectomy without biliary reconstruction.Results: A total of 16 articles were included in this study, and the overall results showed that sex (OR: 1.21, 95% CI: 1.04–1.42), diabetes (OR: 1.21, 95% CI: 1.05–1.38), left trisectionectomy (OR: 3.53, 95% CI: 2.32–5.36), central hepatectomy (OR: 3.28, 95% CI: 2.63–4.08), extended hemihepatectomy (OR: 2.56, 95% CI: 1.55–4.22), segment I hepatectomy (OR: 2.56, 95% CI: 1.50–4.40), intraoperative blood transfusion (OR:2.40 95%CI:1.79–3.22), anatomical hepatectomy (OR: 1.70, 95% CI: 1.19–2.44) and intraoperative bleeding ≥1,000 ml (OR: 2.46, 95% CI: 2.12–2.85) were risk factors for biliary leakage. Age >75 years, cirrhosis, underlying liver disease, left hepatectomy, right hepatectomy, benign disease, Child–Pugh class A/B, and pre-operative albumin <3.5 g/dL were not risk factors for bile leakage after hepatectomy without biliary reconstruction.Conclusion: Comprehensive research in the literature revealed that sex, diabetes, left trisectionectomy, central hepatectomy, extended hemihepatectomy, segment I hepatectomy, intraoperative blood transfusion, anatomical hepatectomy and intraoperative bleeding ≥1,000 ml were risk factors for biliary leakage.

Laennec’s approach for laparoscopic anatomical hemihepatectomy

Background Laennec’s capsule has been found for about 200 years. However, laparoscopic anatomical right and left hemihepatectomy (LARH and LALH) using Laennec’s approach are rarely reported. Methods We retrospectively analyzed the technical details and the surgical outcomes of 15 patients who underwent LAH via Laennec’s approach between May 2017 and July 2020. The operation time, intraoperative blood loss, postoperative complications, and hospital stay were recorded and analyzed. Results Four of 15 patients were diagnosed with hepatic hemangioma, 2 had hepatolithiasis, and 9 patients had primary liver cancer. During the surgery, Laennec’s approach was used for LAH without conversion to open surgery. Four patients were treated with LARH, and 11 patients were cured with LALH. The mean age of the patients was 62.1 ± 6.5 years, and four were male. The mean operative time, blood loss, and length of the postoperative hospital stay were 193 ± 49 min, 247 ± 120 mL, and 8.7 ± 2.0 days, respectively. There was no incidence of postoperative bile leakage and bleeding. No mortality occurred. We also demonstrated that Laennec’s capsule does exist around the peripheral hepatic veins with histological confirmation. Conclusions Laennec’s approach is safe and feasible for LAH. Precise isolation of Laennec’s approach based on Laennec’s capsule helps to standardize the surgical techniques for laparoscopic anatomical hepatectomy.

Perihepatic Abscess due to a Liver Suture with Pledgets Used to Treat a Penetrating Liver Injury

Background. Selective nonoperative management has become the standard for liver injuries. Accordingly, we cannot perform surgery for liver injuries as frequently as in the past. This report is aimed at sharing a valuable experience of postoperative complications after surgery for a liver injury. Case Presentation. A 40-year-old man was stabbed in his abdomen and underwent an emergency laparotomy for a severe liver injury. Five months after the operation, he developed fever, and purulent discharge was observed from an abdominal fistula. He was diagnosed with a perihepatic abscess and duodenal perforation due to the pledgets used for the operation. He underwent a second surgery to remove the pledgets and the abscess cavity for infection control and was discharged in good condition. Conclusion. The intra-abdominal environment should be considered contaminated due to bile leakage in surgeries following liver injury. Furthermore, nonabsorbable agents should not be used in these contaminated areas.

The white test for intraoperative screening of bile leakage: a potential trigger factor for acute pancreatitis after liver resection—a case series

Background Acute pancreatitis after liver resection is a rare but serious complication, and few cases have been described in the literature. Extended lymphadenectomy, and long ischemia due to the Pringle maneuver could be responsible of post-liver resection acute pancreatitis, but the exact causes of AP after hepatectomy remain unclear. Cases presentation We report here three cases of AP after hepatectomy and we strongly hypothesize that this is due to the bile leakage white test. 502 hepatectomy were performed at our center and 3 patients (0.6%) experienced acute pancreatitis after LR and all of these three patients underwent the white test at the end of the liver resection. None underwent additionally lymphadenectomy to the liver resection. All patient had a white-test during the liver surgery. We identified distal implantation of the cystic duct in these three patients as a potential cause for acute pancreatitis. Conclusion The white test is useful for detection of bile leakage after liver resection, but we do not recommend a systematic use after LR, because severe acute pancreatitis can be lethal for the patient, especially in case of distal cystic implantation which may facilitate reflux in the main pancreatic duct.

Effectiveness of White test versus conventional saline test in minimizing biliary leak in partial liver resection in living donor liver transplant

Background Intra-operative bile leakage testing is very important in partial liver resection in living donor liver transplant as it allows detection of bile leaking points on the cut surface and decreases postoperative bile leak which is one of the most dreadful complication following liver transplant surgery. In this study we tried to assess the Effectiveness of White test versus conventional saline test in minimizing biliary leak in partial liver resection in living donor liver transplant. Objective In this study, we assess whether the White test is better than the conventional saline test for the intraoperative detection of biliary leakage in patients who will undergo partial liver resection as living donor liver transplant. Methodology In this study, we assess whether the White test is better than the conventional saline test for the intraoperative detection of bile leakage in patients who underwent partial liver resection as a living donor liver transplant. This study included 60 patients who received partial liver resection as a living donor liver transplant. The conventional saline test (injecting an isotonic sodium chloride solution through the cystic duct) was carried out in 30 patients and the White test (injecting a fat emulsion solution through the cystic duct) was carried out in 30 patients Results Incidence of postoperative bile leakage was compared between the conventional method and the White test. Bile leakage occurred in 8 patients (26.7%) in the conventional method group and in 2 patients (6.7%) in the White test group. In addition, the White test detected intraoperative a significantly higher number of bile leakage sites compared with the conventional method. The White test is better than the conventional test for the intraoperative detection of bile leakage. Conclusion Based on our study, we recommend that surgeons investigating bile leakage sites during liver resections should use the White test instead of the conventional saline test.