Changes in liver graft rejections over time

Area of Science:

• Transplantation Immunology
• Hepatology
• Surgical Outcomes

Background:

• Acute and chronic rejection remain significant challenges in liver transplantation.
• Understanding risk factors for rejection is crucial for improving graft survival.
• Immunological factors are traditionally considered primary drivers of rejection.

Purpose of the Study:

• To evaluate incidence and risk factors for various rejection types after liver transplantation.
• To assess the impact of pretransplant immunological factors and intraoperative bleeding on rejection.
• To analyze trends in rejection over a 20-year period.

Main Methods:

• Retrospective analysis of 388 liver transplantations.
• Evaluation of acute rejection, chronic rejection, steroid-resistant rejection, and graft loss.
• Correlation of rejection events with HLA matching, antibody status, crossmatch results, CMV serology, and total bleeding volume.

Main Results:

• HLA matching, anti-HLA antibodies, positive crossmatch, and CMV serology did not significantly affect rejection occurrence.
• Increased total intraoperative bleeding was associated with diminished acute rejection and reduced steroid-resistant rejection.
• Rejection incidence and early acute rejection decreased over the 20-year study period, with stable immunosuppression protocols.

Conclusions:

• Pretransplant immunological factors had minimal impact on rejection post-liver transplant.
• Increased intraoperative bleeding may paradoxically reduce acute rejection risk.
• A temporal decrease in rejection events suggests improvements in surgical or supportive care over time.