Umbilical artery blood flow characteristics in normal and growth-retarded fetuses.
Time-velocity waveforms or sonograms obtained by pulsed Doppler ultrasound from the umbilical artery were analysed in a longitudinal study of 15 normal pregnancies. The sonograms from nine fetuses with intrauterine growth retardation were compared qualitatively and had quite different characteristics implying a high distal impedance to blood flow. Methods of analysis capable of differentiating between the normal and abnormal sonograms are described and discussed.
D001783:Blood Flow Velocity; D005260:Female; D005312:Fetal Blood / Q000502:physiology*; D005317:Fetal Growth Retardation / Q000503:physiopathology*; D006801:Humans; D011247:Pregnancy; D014465:Ultrasonics; D014469:Umbilical Arteries; D014655:Vascular Resistance