Fig. 2

In patient 2 the apical 4-chamber view demonstrates UBC with absent left atrioventricular connection and balanced ventricles (a) (Video 1). The subcostal LAO view reveals a common atrioventricular valve with superior (arrow) and inferior bridging leaflets (b) (Video 2). The ventricular septum is marked by an asterix. Following surgery the apical 4-chamber shows successful septation of the common atrioventricular valve (c)