Abstract 4557: Validation of Three-Dimensional Echocardiographic Left Ventricular Volumes in Young Pediatric Patients with Complex Congenital Heart Disease: Comparison with Cardiac Magnetic Resonance Imaging
Determination of left ventricular volumes (LVV) is essential for management of infants and small children with complex congenital heart disease (CHD), in particular left heart obstructive lesions. We compared 3-D echo (3DE) LVV in this population to cardiac magnetic resonance (CMR). We prospectively studied children ≤4 y undergoing clinical CMR. Full-volume, subcostal, 3DE data sets were obtained immediately after CMR under similar anesthetic conditions with a 2– 4-MHz matrix-array probe. Endocardial and epicardial borders were manually traced in sequential cross-sectional planes across a minimum of 6 disks. LVVs, mass, and ejection fraction (EF) were subsequently measured on dedicated software using summation of disc methodology. 35 children were studied, including 11 pts with severe LV hypoplasia, median age 7 mo., median weight 7 Kg. Mean vols, mass and EF by 3DE and CMR are shown in the table⇓. LV diastolic vols and mass by 3DE correlated well with good agreement with MRI. 3DE systolic vols correlated well but were higher than MRI (Table⇓, Fig⇓). EF was thus lower by 3DE. 3DE compares well with CMR for evaluation of LV diastolic volumes and mass in young pediatric patients. This will provide essential information to guide clinical management of pts with CHD, especially those with left heart obstructive disease.