[Doppler color sonography in the study of fetal cerebral circulation in oligohydramnios].

Blood flow velocity waveforms in the fetal middle cerebral arteries and umbilical arteries were studied with color flow imaging in 21 pregnancies complicated by oligohydramnios. According to the authors results 3 groups of fetuses may divided: 1. the blood flow in both vessels are normal; 2. the impedance rises to flow within the middle cerebral artery, but blood flow in the umbilical arteries remain normal; 3. the impedance to flow decrease in the middle cerebral arteries, therefore the blood supply of brain improve. On the other hand the impedance of blood flow in umbilical arteries are abnormally large. Results of the study show that the blood flow in these two arteries reacts not on the same manner in cases of the oligohydramnios and this may shed light on the different pathogenetic factors too.