The proximity of the defect to the pulmonary valve can be appreciated. Color flow mapping shows antegrade flow across the mitral valve (red), flow into the left ventricular outflow tract (blue), and across the defect into the right ventricle.
VSD: ventricular septal defect; PA: pulmonary artery; RV: right ventricle; IVS: trabecular portion of the intraventricular septum; LVOT: left ventricular outflow tract; LA: left atrium; LV: left ventricle.