Figure 3.

Ventricular morphology. (A) Normal off-setting of the atrioventricular valves (paediatric orientation) indicated by the red and blue lines. (B) Normal off-setting of the atrioventricular valves (adult orientation). The RV is more trabeculated than the LV and there is a distinct moderator band (*). The most reliable sign used to identify the right ventricle is the apical offset of insertion point of the right-sided atrioventricular valve (arrow) – this is therefore the tricuspid valve and right ventricle. (C) Right ventricle with its three portions in paediatric orientation and (D) adult orientation: inflow (solid arrow) and outflow (dashed arrow), separated by the body of the RV. (E) LV with steeper outflow angle and continuity between inflow and outflow in paediatric orientation and (F) adult orientation. Ao, aorta; LA, left atrium; LV, left ventricle; PA, pulmonary artery; RA, right atrium; RV, right ventricle.