Abstract 9479: Novel Predictors of Left Ventricular Reverse Remodeling in Patients With Recent-onset Dilated Cardiomyopathy Using T1 and T2 Mapping on Cardiac Magnetic Resonance

Introduction: The prognosis of patients with idiopathic dilated cardiomyopathy (DCM) has improved in recent decades with guideline-directed medical therapy. There is an essential need for better biomarkers to predict left ventricular reverse remodeling (LVRR) in DCM. Native T1, T2 and left ventricular (LV) global strain by cardiac magnetic resonance (CMR) without contrast agents provides a novel quantitative method for myocardial tissue characterization. Hypothesis: CMR parameters predict LVRR in patients with DCM. Methods: A total 34 patients ( 58 ± 13 years, 25 male) with DCM underwent baseline CMR imaging (3T Philips), including cine, late gadolinium enhancement (LGE) CMR, and triple-slice T1 and T2 mapping (short modified look locker inversion recovery ShMOLLI sequence). The 6SD-LGE (% area), global circumferential strain (GCS), global radial strain (GRS), global longitudinal strain (GLS), global radial strain (GRS), LV mass index (LVMI), LV end-diastolic volume (EDV), end-systolic volume (ESV) and ejection fraction (EF) were calculated from multiple short-axis views. Echocardiography was conducted before and > 1 year after after optimal medical therapy. Results: The patients were divided into two groups, LVRR with LVEF increase of >10% and the final value of ≥40% for those without. There were no significant differences in LV mass index, LVEDV, LVESV, and LVEF between the two groups (80 ± 20 g/m 2 vs 78 ± 19 g/m 2 ; 174 ± 54 ml vs 165 ± 48 ml; 134 ± 51 ml vs 122 ± 46 ml; 24 ± 9% vs 28 ± 9%, respectively). The any LV global strain showed no significant difference between the two groups. The 6SD-LGE, native T1, and T2 values were significantly lower in LVRR+ group than in LVRR-group (15.3 ± 15.5 % vs 5.9 ± 6.8%;1376 ± 59 ms vs 1301 ± 42 ms;55 ± 3.5 ms vs 50 ± 2.5 ms,respectively). The LGE-6SD < 13%. native T1 value < 1330 ms and T2 values < 53ms were the best threshold values for predicting LVRR (The LGE-6SD: sensitivity, 82%; specificity, 41%; AUC 0.72, T1:sensitivity, 82%; specificity, 71%; AUC 0.87, and T2: sensitivity, 82%; specificity, 63%; AUC 0.88). Conclusions: Native T1 and T2 mapping values may be useful for assessing of the LVRR in patients with DCM even without contrast.