Tissue typing, heart and heart-lung transplantation

Area of Science:

• Immunogenetics
• Transplantation immunology
• Cardiovascular surgery

Background:

• Human Leukocyte Antigen (HLA) matching is standard in some transplants but not routinely performed for heart and heart-lung transplants.
• Pre-existing anti-HLA antibodies and cross-match results are critical factors influencing graft outcomes.
• The impact of HLA compatibility and sensitization on solid organ transplantation requires further investigation.

Purpose of the Study:

• To discuss the effects of HLA matching, pre-existing anti-HLA antibodies, and cross-match results on heart and heart-lung transplant outcomes.
• To evaluate the association between HLA compatibility and graft survival in heart transplantation.
• To highlight the importance of pre-transplant screening and cross-matching, particularly for sensitized patients.

Main Methods:

• Review of multi-center studies and smaller series investigating HLA matching in heart and heart-lung transplants.
• Analysis of graft survival rates based on HLA matching status, presence of anti-HLA antibodies, and cross-match results.
• Comparison of outcomes between sensitized and unsensitized patients, and those with positive versus negative cross-matches.

Main Results:

• Statistically significant improved graft survival was observed with better HLA matching in a multi-center study.
• In a subset of male recipients (non-blood group O), HLA matching showed improved heart graft survival.
• Patients with a positive cross-match had significantly lower graft survival rates compared to those with a negative cross-match.
• Heart transplant recipients with high panel reactive antibodies exhibited worse graft survival one year post-transplant.

Conclusions:

• Prospective HLA matching and cross-matching are crucial for optimizing heart and heart-lung transplant outcomes.
• Pre-transplant screening and prospective cross-matching are essential, especially for highly sensitized patients.
• Minimally, pre-transplant screening and prospective cross-matching should be implemented to improve patient survival rates.