الفهرس 
Prediction of fetal hypoxia by ductus venosus doppler pattern in high-risk pregnancies
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Abstract
Doppler ultrasound has been used to measure the blood flow velocity in vessels during the cardiac cycle in the fetoplacental,uteroplacental circulation and has been focused on arteries for the evaluation of downstream distribution of cardiac output. Because no therapy at present has been shown to significantly improve placental function, the goal of prenatal testing in such cases is to optimize the timing of delivery, late enough to avoid the sequelae of iatrogenic severe prematurity, yet early enough to avoid fetal death. Venous doppler flow measurements have also been reported to allow for a more detailed analysis of the fetal circulatory and cardiac condition especially in the presence of abnormal arterial doppler waveforms