Perfusion Cardiac Magnetic Resonance Imaging as a Rule‐Out Test for Cardiac Allograft Vasculopathy. Issue 10 (23rd May 2016)

• Record Type: Journal Article
• Authors: Chih, S.; Ross, H. J.; Alba, A. C.; Fan, C. S.; Manlhiot, C.; Crean, A. M.
• Is Part Of: American journal of transplantation. Volume 16:Issue 10(2016:Oct.)
• Page Start: 3007
• Page End: 3015
• Publication Date: 2016-05-23
• Subjects: clinical research/practice -- heart transplantation/cardiology -- diagnostic techniques and imaging: magnetic resonance imaging -- vasculopathy; Transplantation of organs, tissues, etc -- Periodicals; 617.95
• DOI: 10.1111/ajt.13839
• Languages: English
• ISSNs: 1600-6135

Abstract

Abstract : Cardiac allograft vasculopathy (CAV) is a leading cause of mortality after heart transplantation. Noninvasive imaging techniques used in CAV evaluation have important limitations. In a cross‐sectional study, we investigated perfusion cardiac magnetic resonance (CMR) imaging to determine an optimal myocardial perfusion reserve index (MPR) cutoff for detecting CAV using receiver operating characteristic curve analysis. We evaluated CMR performance using sensitivity, specificity and likelihood ratio analysis. We included 29 patients (mean 5 ± 4 years after transplant) scheduled for coronary angiography with intravascular ultrasound (IVUS) who completed CMR. CAV was defined as maximal intimal thickness (MIT) >0.5 mm by IVUS of the left anterior descending artery. CAV was evident in 19 patients (70%) on IVUS (mean MIT 0.82 ± 0.42 mm). MPR was significantly lower in patients with MIT ≥0.50 mm (1.35 ± 0.23 vs. 1.71 ± 0.45, p = 0.013). There was moderate inverse correlation between MPR and MIT (r = −0.36, p = 0.075). The optimal MPR cutoff ≤1.68 for predicting CAV showed sensitivity of 100%, specificity of 63%, a negative predictive value of 100%, a positive predictive value of 86% and a positive likelihood ratio of 2.7. An MPR ≤1.68 has high negative predictive value, suggesting its potential as a test to rule out CAV. Abstract : This cross‐sectional study in heart transplant recipients demonstrates perfusion cardiac magnetic resonance imaging has a high negative predictive value for cardiac allograft vasculopathy.