Reproducibility of left atrial assessment in cardiac magnetic resonance imaging. (25th November 2020) - Alfuhied, A
Abstract: Background: Left atrial (LA) volume and strain are recognised as predictors of adverse outcomes in cardiovascular disease. We aimed to determine the test-retest reproducibility of LA assessment derived from cardiac MRI in subjects with and without cardiovascular disease. Methods: 38 participants had two MRI scans a week apart: aortic stenosis (n=16); type 2 diabetes (n=16) and healthy volunteers (n=6). Images were analysed by a single trained observer using Medis v3.1, medical imaging system, Leiden, Netherlands. LA strain and strain rate were assessed with Feature Tracking (QStrain v2.0), corresponding to LA reservoir, conduit, and contractile function. LA ejection fraction (LAEF) was calculated using biplane area-length method (QMass v8.1). Both were assessed on 4- and 2-chamber long-axis standard steady-state free precession cine images, and average values calculated. Results: As shown in the table, the test-retest reproducibility for strain and strain rate was moderate for reservoir phase (CoV 25–28%, ICC ∼0.70) and poor for conduit and contraction phases (CoV>40%). The test-retest repeatability for LA volumes and LAEF was good (CoV 16–29%, ICC≥0.70). Conclusion: LA strain assessment using feature tracking is a poorly reproducible technique on CMR. However, good test-retest reproducibility for LA volumes and EF. Funding Acknowledgement: Type of funding source: Private grant(s) and/or Sponsorship. Main funding source(s): King Saud bin Abdulaziz University for Health Sciences, Riyadh, Kingdom of Saudi Arabia.