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Detection and imaging of cardiac allograft vasculopathy
Ari Pollack1, Tamim Nazif, Donna Mancini
1Department of Medicine, New York-Presbyterian Hospital, Columbia University Medical Center, Columbia University, New York, New York 10032, USA.
Insights
Cardiac allograft vasculopathy (CAV) affects many heart transplant recipients, leading to graft loss. Early detection via imaging is crucial for timely treatment adjustments before revascularization is needed.
Area of Science:
- Cardiology
- Transplant Medicine
- Medical Imaging
Background:
- Cardiac allograft vasculopathy (CAV) is a primary cause of death and graft loss in heart transplant recipients.
- CAV affects up to 50% of patients within 10 years post-transplant.
- Early detection of CAV is critical for intervention before advanced stages requiring revascularization.
Purpose of the Study:
- To review current and emerging imaging modalities for diagnosing and monitoring cardiac allograft vasculopathy (CAV).
- To explore the role of various imaging techniques in the surveillance of heart transplant recipients.
Main Methods:
- Review of diagnostic imaging modalities for CAV, including invasive coronary angiography (ICA).
- Discussion of intravascular ultrasound for detecting subangiographic CAV.
- Evaluation of noninvasive tests like stress testing and coronary computed tomography angiography.
- Consideration of new guidelines from the International Society of Heart and Lung Transplantation.
Main Results:
- Invasive coronary angiography (ICA) remains a traditional screening method for CAV.
- Intravascular ultrasound can detect CAV not visible on angiography.
- Noninvasive methods show promise but currently have limitations in sensitivity and specificity for CAV.
- A consensus definition for CAV classification is still evolving, with recent guidelines emphasizing ICA.
Conclusions:
- Accurate and timely diagnosis of CAV is essential for managing heart transplant recipients.
- While ICA is standard, advanced imaging like intravascular ultrasound offers improved detection.
- Further development of sensitive and specific noninvasive tests is needed for CAV surveillance.
- Ongoing research and evolving guidelines aim to optimize CAV diagnosis and management.
Abstract:
Cardiac allograft vasculopathy (CAV) is an important cause of morbidity and mortality among cardiac transplant recipients. CAV occurs in approximately 30% of patients by 5 years and 50% by 10 years, and is a major cause of graft loss and death. Early detection of CAV is important because it may allow alterations in medical therapy before progression to the stage that revascularization is required. This has led to routine screening for CAV in transplant recipients, traditionally by invasive coronary angiography (ICA). Recent advances in imaging technology, specifically intravascular ultrasound, now also permit detection of subangiographic CAV. Noninvasive stress testing and multislice coronary computed tomography angiography have been investigated as noninvasive alternatives to routine ICA. However, currently available noninvasive tests remain limited with respect to their sensitivity and specificity for CAV. Given the multiple available diagnostic modalities, no consensus definition for the classification of CAV has been widely accepted, although new guidelines that rely heavily on ICA have recently been published by the International Society of Heart and Lung Transplantation. This review summarizes imaging modalities that are utilized in the diagnosis and surveillance of CAV and explores newer imaging techniques that may play a future role.
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