Uterine Cavity and Blood Flow After Conservative Management of Placenta Previa/Accreta

"Color Doppler ultrasound will be used to demonstrate the main ascending branches of left and right uterine arteries as they cross over the hypogastric vessels just before they enter the uterus at the uterine-cervical junction. The high pass filter was set at 125 Hz and the uterine artery will be obtained immediately after the crossing of the hypogastric artery. The sample volume will be placed on the artery with an angle of about 0°. After detection of blood flow and visu¬alization of the waveform of the uterine artery, five blood flow indices will be automatically cal¬culated:~The pulsatility index The resistance index The peak systolic velocity ; The end-diastolic velocity The time-averaged maximum"