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KMID : 0381219910230010067
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Journal of RIMSK
1991 Volume.23 No. 1 p.67 ~ p.71
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Doppler Umbilical Artery Flow Velocity Waveforms in Normal Pregnancy
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Abstract
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A pulsed doppler ultrasound was used to obtain umbilical artery velocity waveforms and to
calculate the peak-systolic / end-diastolic (A/B) ratio as an index of placental resistance. A total 178
examinations were performed on 140 normal pregnant women between 16 to 42 weeks gestation. The flow velocity-time waveforms were examined visually and quantitated by use of the A/B ratio. In normal pregnancy, umbilical artery waveforms show high diastolic flow velocity indicative of
low downstream resistance.
Analysis of umbilical artery velocity waveforms demonstrated that the value of the A/B ratio diminished progressively as a result of a gradual increase in the continuous perfusion of the placenta with advancing gestational age in normal pregnancy.
After 30 weeks gestation, an umbilical artery value of < 3 could be used for the separation of normal versus abnormal.
Abnormal umbilical waveforms correlate strongly with fetal growth retardation and adverse perinatal outcome.
Antenatal studies of umbilical artery flow velocity waveforms with doppler ultrasound as screening test may prove to be an important fetal surveillance tool.
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