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Published on: November 2, 2019
Cardiac allograft vasculopathy: advances in diagnosis
Qiangjun Cai1, Umamahesh C Rangasetty, Alejandro Barbagelata
1Division of Cardiology, Department of Medicine, and Texas Transplant Center, University of Texas Medical Branch, Galveston, TX 77555, USA. mmkoerne@utmb.edu
Insights
Cardiac allograft vasculopathy (CAV) is a major risk for heart transplant patients. Intravascular ultrasound (IVUS) offers superior detection of CAV compared to angiography, aiding early diagnosis and improved patient outcomes.
Area of Science:
- Cardiology
- Transplant Medicine
- Medical Imaging
Background:
- Cardiac allograft vasculopathy (CAV) significantly increases morbidity and mortality in heart transplant recipients.
- Diffuse intimal thickening and luminal narrowing characterize CAV, often leading to underdiagnosis by standard coronary angiography.
- Routine annual surveillance angiography is common but may miss the diffuse nature of CAV.
Purpose of the Study:
- To review currently available diagnostic methods for cardiac allograft vasculopathy (CAV).
- To highlight the diagnostic advantages of intravascular ultrasound (IVUS) over conventional angiography for CAV detection.
- To discuss the role of emerging imaging modalities in CAV diagnosis.
Main Methods:
- Review of diagnostic techniques for cardiac allograft vasculopathy (CAV).
- Comparison of coronary angiography and intravascular ultrasound (IVUS) sensitivity and specificity for CAV.
- Evaluation of noninvasive tests (dobutamine stress echocardiography, nuclear stress test) and advanced imaging (CT, MRI) for CAV diagnosis.
Main Results:
- Intravascular ultrasound (IVUS) is more sensitive than angiography for detecting diffuse intimal thickening and luminal narrowing in CAV.
- IVUS provides detailed quantification of intimal thickness, vessel wall morphology, and composition.
- Noninvasive tests and advanced imaging modalities show promise but require further validation for CAV diagnosis.
Conclusions:
- Intravascular ultrasound (IVUS) is a valuable adjunct to angiography and the optimal tool for early CAV detection.
- Accurate diagnosis of CAV is crucial for managing heart transplant recipients.
- Continued research into advanced imaging techniques is needed to improve CAV detection and patient management.
Abstract:
Cardiac allograft vasculopathy (CAV), characterized by diffuse intimal thickening and luminal narrowing in the arteries of the allograft, is the leading cause of morbidity and mortality in cardiac transplant recipients. Many transplant centers perform routine annual surveillance coronary angiography. However, angiography can underdiagnose or miss CAV due to its diffuse nature. Intravascular ultrasound (IVUS) is more sensitive than angiography. IVUS provides not only accurate information on lumen size, but also quantification of intimal thickening, vessel wall morphology, and composition. IVUS has evolved as a valuable adjunct to angiography and the optimal diagnostic tool for early detection. Noninvasive testing such as dobutamine stress echocardiography and nuclear stress test have shown considerable accuracy in diagnosing significant CAV. Computed tomographic imaging and cardiac magnetic resonance imaging are promising new modalities but require further study. This article reviews the diagnostic methods that are currently available.
