Fetal echocardiography
FE was done for the referred cases to detect any structural or rhythm abnormalities in the fetal heart according to the guidelines and standards of the American Society of Echocardiography for performance of fetal echocardiogram [17] using GE Voluson E6 high-end 4DOB/GYN ultrasound machine and transducer probe with a frequency range of 5–8 MHz, EPIQ CV X made by Philips with transducer 8 MHz. A standard two-dimensional (2D), color flow (CF), Doppler echocardiography examinations were done. Views included four chamber, five chamber, long axis (left and right ventricular outflow), 3 -vessel and tracheal, ductal, and aortic arch views.