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HLA-DR matching reduces rejection rate in heart transplantation
T Leivestad1, A Foerster, S Simonsen
1Institute of Transplantation Immunology, Rikshospitalet, Oslo, Norway.
Insights
HLA-DR matching in heart transplants reduces acute cellular rejection, particularly severe cases. Mismatches lead to earlier rejection episodes, though graft survival differences were not statistically significant.
Area of Science:
- Immunology
- Transplantation Science
- Cardiology
Background:
- Acute cellular rejection remains a significant challenge in heart transplantation.
- Human Leukocyte Antigen (HLA) compatibility, particularly HLA-DR, is crucial for graft survival.
- Understanding the impact of specific HLA antigen matching on rejection is vital for improving outcomes.
Purpose of the Study:
- To investigate the influence of serological matching for ten HLA-DR antigens on acute cellular rejection in heart transplant recipients.
- To correlate HLA-DR matching with the incidence and timing of rejection episodes.
- To assess the impact of HLA-A and HLA-B mismatches on rejection.
Main Methods:
- Retrospective analysis of first cardiac graft recipients and their donors (1983-1994).
- HLA typing for HLA-DR, HLA-A, and HLA-B antigens.
- Correlation of HLA typing results with endomyocardial biopsy findings during the first posttransplant year.
Main Results:
- Recipients receiving HLA-DR matched hearts exhibited a lower frequency of acute cellular rejection.
- Moderate to severe rejection grades were significantly less frequent in HLA-DR matched recipients.
- Rejection episodes occurred earlier in patients with HLA-DR mismatched grafts; HLA-A or -B mismatches showed no significant influence.
Conclusions:
- HLA-DR matching is associated with a reduced incidence of acute cellular rejection in heart transplantation.
- Serological matching for HLA-DR antigens appears to be a critical factor in preventing early and severe rejection.
- Further investigation into HLA-DR matching's long-term impact on graft survival is warranted.
Abstract:
We have studied the influence of serological matching for ten HLA-DR antigens on the occurrence of acute cellular rejection in heart transplantation by correlating the findings in routine endomyocardial biopsies taken during the first posttransplant year with the results of HLA typing of all recipients of a first cardiac graft and their donors during 1983-1994 at our center. We found that recipients of HLA-DR matched hearts had a lower frequency of acute cellular rejection, especially so for the moderate/severe rejection grades. Also, rejection appeared earlier in the DR-mismatched combinations. Whether the mismatch was for one or two DR antigens did not make a significant difference, neither could we demonstrate any influence of HLA-A or -B mismatches. The survival of DR-matched cardiac grafts tended to be higher at 1 year than DR-mismatched grafts, but the difference did not reach statistical significance.