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Intravascular ultrasound imaging after cardiac transplantation: advantage of multi-vessel imaging
S R Kapadia1, K M Ziada, P L L'Allier
1The Cleveland Clinic Foundation, OH 44195, USA.
Insights
Multivessel intravascular ultrasound imaging significantly increases the detection of transplant vasculopathy compared to single-vessel imaging. This finding is crucial for accurate trial interpretation and patient assessment.
Area of Science:
- Cardiology
- Transplant Medicine
- Medical Imaging
Background:
- Intravascular ultrasound (IVUS) is a key tool for assessing transplant vasculopathy.
- Standardized IVUS imaging protocols are lacking.
- The diagnostic yield of single versus multiple epicardial vessel imaging for transplant vasculopathy remains unclear.
Purpose of the Study:
- To compare the efficacy of three-vessel versus one-vessel IVUS imaging in detecting transplant vasculopathy.
- To determine the prevalence of transplant vasculopathy using different imaging strategies.
Main Methods:
- Retrospective analysis of 111 heart transplant recipients with baseline IVUS.
- Longitudinal follow-up at 1, 2, and 3 years post-transplant.
- Analysis of 222 arteries (LAD, LCX, RCA) across 519 segments and 772 sites.
Main Results:
- Transplant vasculopathy prevalence increased with the number of imaged vessels: 27% (1-vessel) vs. 58% (3-vessel) at 1 year.
- Prevalence rates at 3 years were 39% (1-vessel) and 74% (3-vessel).
- Three-vessel imaging identified disease in 55% of patients who would have been considered disease-free with single-vessel imaging.
Conclusions:
- Multivessel IVUS imaging demonstrates superior sensitivity for detecting transplant vasculopathy.
- Imaging protocol, specifically the number of vessels assessed, is a critical factor in trial design and interpretation.
- Standardizing IVUS protocols is essential for reliable endpoint assessment in transplant research.
Background:
Intravascular ultrasound is a sensitive tool to study transplant vasculopathy. However, there is no consensus regarding the methodology for imaging protocol. The impact of single versus multiple epicardial vessel imaging in determining the prevalence of transplant vasculopathy has not been determined. This study examines the benefit of three-vessel imaging versus one-vessel imaging in detecting transplant vasculopathy.
Methods And Results:
One hundred eleven transplant recipients with intravascular ultrasound imaging at baseline (within 2 months of transplantation) were studied: 107 at 1-year, 53 at 2-year and 41 at 3-year follow-up. A total of 222 arteries, 519 segments and 772 sites were analyzed (94 LAD, 65 LCX and 65 RCA). The prevalence of transplant vasculopathy lesions was 27%, 41% and 58% at 1 year, 39%, 55% and 71% at 2 years and 39%, 55% and 74% at 3 years for patients with one-, two- and three-vessel imaging, respectively. Single- or two-vessel disease was present in 23% (7) and 32% (10) patients with three-vessel imaging, leading to the potential mislabeling of these 17 (55%) patients as "disease free" if they underwent only single-vessel imaging.
Conclusions:
Multivessel imaging is more sensitive in detecting the transplant vasculopathy lesions compared to single-vessel imaging. This important variable should be considered when designing and interpreting trials utilizing intravascular imaging derived end-point.