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An Immunological Model for Heterotopic Heart and Cardiac Muscle Cell Transplantation in Rats
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Does asymptomatic recurrent diffuse capillary C4d complement deposition impair cardiac allograft function?

Simone Frea1, Cristina Iacovino2, Michela Botta2

  • 1Division of Cardiology, Internal Medicine Department, Città della Salute e della Scienza and University of Torino, Torino, Italy. simone.frea@libero.it.

Clinical Transplantation
|August 5, 2016
PubMed
Summary
This summary is machine-generated.

Recurrent antibody-mediated rejection (AMR) in heart transplant patients, even without clear biopsy signs, can lead to adverse graft remodeling and impaired left ventricular function within the first year. Early detection of diffuse capillary C4d immunostaining is crucial.

Keywords:
C4d complement depositionantibody-mediated cardiac allograft rejectioncardiac allograft vasculopathycardiac remodelingechocardiographyendomyocardial biopsyheart transplantimmunochemistrytissue Doppler imaging

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Area of Science:

  • Cardiology
  • Transplantation Immunology
  • Cardiac Pathology

Background:

  • Antibody-mediated rejection (AMR) is a significant concern after heart transplantation.
  • Asymptomatic recurrent AMR (rAMR), defined by diffuse capillary C4d immunostaining on endomyocardial biopsies (EMBs), requires further investigation for its impact on graft function.
  • Left ventricular (LV) function and remodeling are key indicators of cardiac allograft health.

Purpose of the Study:

  • To evaluate the impact of asymptomatic rAMR on LV function and remodeling in the first year post-heart transplantation.
  • To determine if diffuse capillary C4d immunostaining (rAMR) is an early marker for graft dysfunction.
  • To assess the risk of LV dysfunction and adverse remodeling associated with rAMR.

Main Methods:

  • Prospective study of 54 heart transplant recipients with stable graft function one month post-transplant.
  • Regular echocardiography (490 total) and endomyocardial biopsies (EMBs) were performed during the first year.
  • Asymptomatic rAMR (diffuse capillary C4d immunostaining) was analyzed as a risk factor for graft deterioration.

Main Results:

  • Five patients developed rAMR within the first year.
  • rAMR was significantly associated with increased risk of LV concentric hypertrophy (OR 3.6) and reduced lateral S' peak velocity (OR 2.3).
  • Patients with rAMR exhibited adverse graft remodeling (increased LV end-diastolic volume) and functional deterioration (reduced lateral S' peak velocity).

Conclusions:

  • Recurrent asymptomatic diffuse capillary C4d immunostaining is linked to early adverse cardiac allograft remodeling.
  • rAMR may contribute to the development of graft dysfunction after heart transplantation.
  • Monitoring for C4d deposition is important for identifying early signs of rejection and preserving graft function.