Ischemic-Type Biliary Lesions After Liver Transplant: Factors Causing Early-Onset Versus Late-Onset Disease

Objectives: Biliary complications such as an ischemictype biliary lesion can increase morbidity and mortality after liver transplant. Former studies have investigated several risk factors, but the underlying pathomechanism remains unclear. The focus of this study was to investigate factors causing early-onset (< 12 mo after liver transplant) versus late-onset ischemic-type biliary lesions (> 12 mo after liver transplant). Materials and Methods: This retrospective study included 641 patients. Patients were grouped to those who developed ischemic-type biliary lesion and those who did not. Patients developing ischemic-type biliary lesions were further subgrouped into those diagnosed early (< 12 mo) and late (> 12 mo) after liver transplant. We analyzed demographic data, characteristics, and comorbidities of the recipients and donors, operative variables, and postoperative course, as well as laboratory values. Results: The incidence of ischemic-type biliary lesions was 4.9%. Retransplant was performed more frequently in patients developing ischemic-type biliary lesions. The number of transfusions of blood products was higher in ischemic-type biliary lesion patients, especially in the early-onset ischemic-type biliary lesion group. Bilirubin levels were higher in patients with ischemictype biliary lesions starting from day 7 after the operation, particularly in the early-onset group. Survival tended to be best in the late-onset ischemictype biliary lesion group; however, this difference was not significant. Conclusions: This study serves as a supplement to current data and the understanding of ischemic-type biliary lesions with emphasis on the relevance of disease onset and causes. We could in fact determine transfusion of blood products as a determinant of an early onset of ischemic-type biliary lesion. Bilirubin could be a surrogate marker for ischemic-type biliary lesions, especially in its early-onset form.