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[Variability of transplant vasculopathy. A study with intravascular ultrasound]
V Klauss1, J Rieber, P Uberfuhr
1Kardiologische Abteilung, Klinikum Innenstadt, Universität München.
Insights
Intravascular ultrasound (IVUS) detects cardiac allograft vasculopathy (CAV) missed by coronary angiography (CA) in heart transplant patients. IVUS reveals significant intimal thickening, even when CA appears normal, highlighting its superior sensitivity for CAV diagnosis.
Area of Science:
- Cardiology
- Transplantation Medicine
- Medical Imaging
Background:
- Cardiac allograft vasculopathy (CAV) significantly impacts long-term survival post-heart transplantation.
- Coronary angiography (CA) has limitations in detecting early or mild CAV.
- Intravascular ultrasound (IVUS) offers detailed vessel wall morphology assessment.
Purpose of the Study:
- To compare the in vivo diagnostic capabilities of IVUS versus CA for CAV detection.
- To analyze the intraindividual and segmental variability of CAV involvement in heart transplant recipients.
Main Methods:
- IVUS imaging was performed during routine follow-up angiography in 33 heart transplant patients.
- 134 arterial segments were assessed and graded using a modified Stanford score (1-6) via IVUS.
- Patient characteristics and lab findings were correlated with observed intimal thickening.
Main Results:
- CA identified 85% of segments as normal, while IVUS detected mild to severe intimal thickening in 56% of these.
- Significant intimal thickening was more prevalent in Left Anterior Descending (LAD) artery segments compared to the Right Circumflex (RCX).
- CAV involvement showed high intraindividual heterogeneity in 39% of patients, with no significant clinical or laboratory correlations.
Conclusions:
- IVUS is a highly sensitive imaging modality for in vivo detection of CAV in heart transplant recipients.
- IVUS can identify significant intimal thickening missed by conventional coronary angiography.
- This improved detection may aid in earlier management and improved outcomes for CAV.
Abstract:
Cardiac allograft vasculopathy (CAV) influences long-term survival of patients after heart transplantation. Histopathology studies have demonstrated the insensitivity of coronary angiography (CA) for detecting CAV. Intravascular ultrasound (IVUS) is an imaging technique that provides qualitative and quantitative characterization of vessel wall morphology. The purpose of this study was to compare in vivo IVUS with coronary angiography in cardiac transplant recipients and to analyze intraindividual and segmental variability of CAV involvement. IVUS studies were performed at routine follow-up angiography in 33 patients 48 +/- 23 months after heart transplantation. 134 segments (1 to 8 per patient) were classified by IVUS according to a modified Stanford score (morphometric grading from 1 to 6). Patient characteristics and laboratory findings were further compared with intimal thickening. 114/134 (85%) segments were normal with CA. In 56% of these segments, IVUS revealed mild to moderate (IVUS grade 2 to 4, n = 45) or severe (IVUS grade 5 to 6, n = 19) intimal thickening. Mean IVUS scores between proximal and distal segments were not different (2.9 +/- 1.9 vs. 2.4 +/- 1.9, ns). Intimal thickening was more pronounced in segments of the LAD compared to the RCX (3.1 +/- 2.0 vs. 2.03 +/- 1.6, p < 0.01). In 39% of patients, the intraindividual extent of CAV was very heterogeneous (range: 3 to 5 IVUS grades). There was no significant correlation between IVUS and clinical or laboratory findings. IVUS is a sensitive method for the in vivo detection of CAV, while even severe intimal thickening can often not be identified by CA.(ABSTRACT TRUNCATED AT 250 WORDS)