(A) The superior vena cava (SVC) entering the right atrium (RA) as seen from the subcostal view. (A) The superior vena cava (SVC) entering the right atrium (RA) as seen from the subcostal view. (B) Colour Doppler mapping (grey area) highlighting the flow down the SVC and into the right atrium. Ao, aorta; LV, left ventricle; RV, right ventricle. Martin Kluckow, and Nick Evans Arch Dis Child Fetal Neonatal Ed 2000;82:F182-F187 Copyright © BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health. All rights reserved.