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Arteritis in cardiac rejection after transplantation
Insights
Arteritis in transplanted hearts is a strong indicator of severe acute rejection. This finding highlights arteritis as a key marker for identifying patients at higher risk of fatal cardiac allograft rejection.
Area of Science:
- Cardiology
- Transplantation Immunology
- Pathology
Background:
- Cardiac allograft rejection remains a significant challenge in heart transplantation.
- Identifying reliable indicators of acute rejection is crucial for patient management and improving outcomes.
Purpose of the Study:
- To investigate the incidence and significance of arteritis in rejected and non-rejected cardiac allografts.
- To evaluate arteritis as a diagnostic marker for acute cardiac rejection using endomyocardial biopsies.
Main Methods:
- Analysis of 33 explanted hearts (autopsy or retransplantation) over a 4-year period.
- Review of 863 endomyocardial biopsies to assess the presence of arteritis in relation to rejection status.
- Correlation of arteritis findings with patient outcomes, including fatal rejection and retransplantation.
Main Results:
- Arteritis was present in all 14 rejected hearts but absent in 19 non-rejected hearts (p = 0.001).
- Among 16 patients with biopsy-proven arteritis, 44% experienced fatal rejection or required retransplantation.
- Arteritis detection in endomyocardial biopsies correlated with impending death or retransplantation due to rejection.
Conclusions:
- Arteritis is a significant indicator of severe acute cardiac allograft rejection.
- The presence of arteritis in endomyocardial biopsies identifies patients at increased risk for poor outcomes.
- Arteritis was observed across various immunosuppressive drug regimens, suggesting it is a distinct pathological process.
Abstract:
During a 4-year experience with cardiac transplantation, 33 hearts were obtained by autopsy or surgical resection for retransplantation. Arteritis was a feature common to all rejected hearts (14 of 14), but was absent in explanted hearts without rejection (0 of 19) (p = 0.001). Monitoring of acute cardiac rejection by endomyocardial biopsy (863 biopsies) was also reviewed, with special reference to the incidence of arteritis. Among the 16 patients with arteritis on 1 or more biopsies, 44% (7 patients, confidence limits 29 to 60%) suffered fatal rejection or underwent retransplantation because of irreversible rejection. Arteritis was seen in the small vessels obtained by endomyocardial biopsy in 4 of 5 persons who underwent biopsy within 3 days of death or retransplantation due to rejection and on none of the 6 persons who underwent biopsy within 3 days of death or retransplantation for causes other than rejection. Thus, arteritis is an important indicator for severe acute rejection, and although often reversible, may identify patients at higher risk for fatal rejection. Arteritis occurred in transplanted hearts subjected to varying combinations of cyclosporine, azathioprine and steroid therapy and could not be correlated with any drug regimen.