Fig. 13.

Fetal echocardiographic image of four-chamber view showing a balanced complete atrioventricular septal defect (AVSD). During diastole, the common atrioventricular valve is open with the absence of AV septum (H-shaped by color Doppler mapping due to the absence of the AV septum), and large atrial and ventricular defects. LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle; ASD, primum atrial septum defect; VSD, inlet ventricular septal defect; AV atrioventricular valve.