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C4d analysis in endomyocardial biopsies of heart transplant patients: is there a correlation with hemodynamic data?
1Cardiac Surgery Department, San Giovanni Battista University Hospital, Turin, Italy.
Insights
C4d positivity in endomyocardial biopsies did not correlate with hemodynamic compromise in heart transplant patients. This suggests C4d may not be a reliable indicator of allograft dysfunction in antibody-mediated rejection.
Area of Science:
- Cardiology
- Immunology
- Transplantation
Background:
- Endomyocardial biopsy (EMB) is crucial for monitoring heart transplant rejection.
- Antibody-mediated rejection (AMR) diagnosis and treatment protocols are not well-defined.
- AMR diagnosis involves capillary damage and complement activation, with C4d as a marker.
Purpose of the Study:
- To correlate C4d expression in EMB with hemodynamic compromise.
- To assess the utility of C4d in diagnosing AMR in heart transplant recipients.
Main Methods:
- Retrospective analysis of 491 EMB and right heart catheterization procedures (2008-2009).
- Histologic evaluation of EMB for C4d and acute cellular rejection (ACR).
- Comparison of C4d status with hemodynamic parameters.
Main Results:
- No significant difference in hemodynamic data between C4d-positive and C4d-negative patients.
- No significant difference observed when comparing C4d status in the absence of ACR.
- C4d positivity did not influence hemodynamic parameter variations.
Conclusions:
- C4d positivity in EMB did not correlate with hemodynamic compromise in this cohort.
- Findings suggest C4d positivity alone may not indicate significant allograft dysfunction.
- Difficulty in diagnosing AMR due to reliance on allograft dysfunction criteria when C4d is not correlated.
Background:
Endomyocardial biopsy (EMB) is the gold standard for immunologic follow-up to detect acute cellular rejection after cardiac transplantation. Conversely, protocols for the diagnosis and treatment of antibody-mediated rejection (AMR) are not well defined. Histologically, AMR is diagnosed by the presence of capillary damage associated with complement activation. The aim of this study was to correlate C4d expression of activated complement in EMB with hemodynamic compromise upon right heart catheterization.
Methods:
Heart transplant patients underwent hemodynamic and histologic follow-up with EMB and right heart catheterization between January 2008 and December 2009 for a total of 491 procedures. The cardiac biopsy was evaluated for acute cellular and AMR by means of the presence of the C4d complement fraction. The histologic results were compared with hemodynamic data registered during right heart catheterization.
Results:
Comparison of the hemodynamic data of subjects with versus without C4d positivity showed no significant difference. Furthermore, there was no significant difference comparing patients with versus without C4d positivity in the absence of significant acute cellular rejection episodes. (C4d-/ACR- vs C4d+/ACR-). The variation of each single hemodynamic parameter from its basal value (defined as the mean value in case of C4d-/ACR-) seemed to not be influenced by the presence of C4d+.
Conclusions:
In our experience, C4d has been routinely evaluated in the majority of EMBs. We could not demonstrate a significant correlation of C4d positivity with hemodynamic compromise. These findings suggest that significant allograft dysfunction is not related to C4d positivity. Therefore, the diagnosis of AMR is difficult to establish, because allograft dysfunction is 1 of the 3 fundamental criteria.
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