RESUMO
PURPOSE: To evaluate the relationship between myocardial extracellular volume (ECV) fraction measured using dual-energy computed tomography with late iodine enhancement (LIE-DECT) and risk of heart failure (HF) in patients without coronary artery disease (CAD), and to evaluate the relationship between ECV and left ventricular structure and function. MATERIALS AND METHODS: Sixty consecutive HF patients without CAD and 60 consecutive participants without heart disease who underwent coronary CT angiography (CCTA) following LIE-DECT were included. ECV of the left ventricle was calculated from the iodine maps and hematocrit levels using the American Heart Association (AHA) 16-segment model. Cardiac structural and functional parameters were collected including left ventricular end-systolic volume (LVESV), left ventricular end-diastolic volume (LVEDV), left ventricular ejection fraction (LVEF), left atrial volume (LAV), interventricular septal thickness (IVST), and N-terminal pro-brain natriuretic peptide (NT-pro-BNP). RESULTS: ECV in HF patients without CAD (31.3⯱â¯4.0 %) was significantly higher than that in healthy subjects (27.1⯱â¯3.7 %) (Pâ¯<â¯0.001). Multivariate linear analysis revealed that ECV was associated with age (ßâ¯=â¯0.098, Pâ¯=â¯0.010) and hypertension (ßâ¯=â¯2.093, Pâ¯=â¯0.011) in all participants. Binary logistic regression analysis showed that after adjusting for age, sex, body mass index (BMI), smoking, and drinking, ECV was a risk factor affecting the occurrence of HF in those without CAD (ORâ¯=â¯1.356, 95 %CIï¼1.178-1.561, Pâ¯<â¯0.001). A positive correlation was found between ECV and NT-pro-BNP, LVEDV, LVESV, and LAV (râ¯=â¯0.629, 0.329, 0.346, and 0.338, respectively; all Pâ¯<â¯0.001) in all participants. CONCLUSIONS: ECV could be measured using LIE-DECT iodine maps. ECV elevation was a risk factor for HF without CAD and correlated with cardiac structure and function.