Related Experiment Video
Updated: Aug 23, 2026
Cardiac Loading using Passive Left Atrial Pressurization and Passive Afterload for Graft Assessment
Published on: August 2, 2024
Surrogate markers for late cardiac allograft survival
Mandeep R Mehra1, Ray Benza, Mario C Deng
1Ochsner Clinic Foundation, New Orleans, LA, USA. mmehra@ochsner.org
Insights
Early detection of cardiac allograft vasculopathy using intravascular ultrasound is a promising surrogate marker for long-term heart transplant outcomes. Intimal thickening predicts future disease and adverse events, offering a standardized measurement for monitoring.
Area of Science:
- Cardiology
- Transplantation immunology
- Medical imaging
Background:
- No definitive surrogate marker exists for late cardiac allograft outcomes.
- Early detection of cardiac allograft vasculopathy (CAV) is crucial.
- Intravascular ultrasound (IVUS) shows prognostic capability for CAV.
Purpose of the Study:
- To evaluate intimal thickening detected by IVUS as a surrogate marker for cardiac allograft outcome.
- To identify thresholds of intimal thickening that predict future disease and hard endpoints.
- To explore other potential surrogate markers for allograft assessment.
Main Methods:
- Prospective investigations utilizing intravascular ultrasound to measure intimal thickening.
- Analysis of intimal thickening thresholds in relation to angiographic disease and hard allograft endpoints.
- Review of other potential surrogate markers including pump function, histology, and peripheral markers.
Main Results:
- Intimal thickening detected by IVUS has prognostic capability, even with normal coronary angiograms.
- Established thresholds of intimal thickening predict future angiographic disease, ischemic events, allograft failure, and death.
- IVUS offers reproducibility and standardization for measuring intimal thickening over time.
Conclusions:
- Intimal thickening measured by IVUS is a key candidate for a validated surrogate marker of late cardiac allograft outcome.
- Further evaluation of other markers like allograft function, histology, and peripheral markers is warranted.
- Standardized IVUS assessment of intimal thickening can improve long-term surveillance of heart transplant recipients.
Abstract:
While no definite well-validated surrogate marker for late cardiac allograft outcome is available, the early detection of cardiac allograft vasculopathy represents the 'key' candidate as an effective surrogate. Intravascular ultrasound detected intimal thickening has been noted to possess prognostic capability despite the presence of a normal coronary angiogram. Several prospective investigations have pointed to accurate thresholds of intimal thickening that are prognostically relevant and predict not only future angiographic disease but also hard allograft related endpoints including ischemic cardiac events, allograft failure, and death. Because of the resolution of intravascular ultrasound, this technique accords reproducibility and the ability to standardize the degree of intimal thickening over time. Other candidates that may serve as surrogates once appropriately evaluated include measures of allograft pump function, intragraft histology, and peripheral markers including but not limited to structural proteins (cardiac specific troponins), inflammatory markers (CRP), fibrogenic markers (TGF-beta, fibroblast growth factor), and immune markers (anti-HLA Ab and indirect alloantibodies).
