https://onlinelibrary.wiley.com/doi/pdf/10.1111/ajt.13909

2016 Comprehensive Update of the Banff Working Group on Liver Allograft Pathology: Introduction of Antibody-Mediated Rejection.

https://aasldpubs.onlinelibrary.wiley.com/doi/pdf/10.1002/hep.1840160110

Ischemic-type biliary complications after orthotopic liver transplantation.

The most important transplantation antigen system in solid organ transplantation is the ABO histo-blood group system. Crossing the ABO barrier in solid organ transplantation is usually not done except for emergency liver transplantations. Early experiences of crossing the ABO barrier in renal transplantation were very disappointing. In the 1970s, clinical trials were started transplanting kidneys of subgroup A2 into blood group O recipients. The tissues of the A2 subgroup expresses reduced amount of A antigens compared to subgroup A1 and the recipients had no special pretreatment and standard immunosuppression. A number of early graft losses were experienced but the trial also resulted in several long time surviving grafts. A few centres have adapted the concept of A2 to non A kidney transplantations with successful results, when the recipient anti-A titres are low or reduced prior to transplantation. In the early 1980s one group successfully transplanted A1 and B kidneys from living related donors across the ABO-barrier using an immunosuppressive protocol consisting of quadruple drugs and splenectomy and this protocol was adapted by a few other groups. In Japan, where cadaver donors are available in very limited number, the largest number of ABO-incompatible transplantations have been performed. Altogether more than 300 ABO-incompatible kidney transplantations have been performed in more than 40 centres since 1989. ABO-incompatible liver transplantations have been performed mainly in emergency cases and the results have generally been inferior to ABO-compatible grafts. In children below the age of three years, liver transplantations across the ABO-barrier have been quite successful especially with living related donors. Very few ABO-incompatible heart/heart-lung/lung-transplantations have been reported with a few successful cases, but the majority have been failures. Recently a series of ABO-incompatible heart transplants performed in small children have been reported with a high success rate.

ABO-incompatibility in solid organ transplantation

Nonanastomotic biliary strictures after liver transplantation, part 1: Radiological features and risk factors for early vs. late presentation.

Biliary complications are a major source of morbidity, graft loss, and even mortality after liver transplantation. The most troublesome are the so-called ischemic-type biliary lesions (ITBL), with an incidence varying between 5% and 15%. ITBL is a radiological diagnosis, characterized by intrahepatic strictures and dilatations on a cholangiogram, in the absence of hepatic artery thrombosis. Several risk factors for ITBL have been identified, strongly suggesting a multifactorial origin. The main categories of risk factors for ITBL include ischemia-related injury; immunologically induced injury; and cytotoxic injury, induced by bile salts. However, in many cases no specific risk factor can be identified. Ischemia-related injury comprises prolonged ischemic times and disturbance in blood flow through the peribiliary vascular plexus. Immunological injury is assumed to be a risk factor based on the relationship of ITBL with ABO incompatibility, polymorphism in genes coding for chemokines, and pre-existing immunologically mediated diseases such as primary sclerosing cholangitis and autoimmune hepatitis. The clinical presentation of patients with ITBL is often not specific; symptoms may include fever, abdominal complaints, and increased cholestasis on liver function tests. Diagnosis is made by imaging studies of the bile ducts. Treatment starts with relieving the symptoms of cholestasis and dilatation by endoscopic retrograde cholangiopancreaticography (ERCP) or percutaneous transhepatic cholangiodrainage (PTCD), followed by stenting if possible. Eventually up to 50% of the patients with ITBL will require a retransplantation or may die. In selected patients, a retransplantation can be avoided or delayed by resection of the extra-hepatic bile ducts and construction of a hepaticojejunostomy. More research on the pathogenesis of ITBL is needed before more specific preventive or therapeutic strategies can be developed.

Causes and consequences of ischemic-type biliary lesions after liver transplantation

Increased bile duct complications in ABO incompatible liver transplant recipients.

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Increased bile duct complications in ABO incompatible liver transplant recipients.