Fig. 4

Prenatal and postnatal imaging findings of PA/IVS. (A) Prenatal ultrasound demonstrating severe regurgitation (large regurgitant jet); (B) Spectral doppler showing peak regurgitant velocity (416 cm/s). (C) Retrograde ductus arteriosus (DA) flow into pulmonary artery. (D-F). Postnatal echocardiography confirming prenatal findings with consistent anatomical and hemodynamic features