[Correlation of fetal umbilical artery velocity waveforms with placental pathology and biochemistry].

The ratio of peak systolic to least diastolic flow velocity (S/D) of the umbilical artery was measured in 119 pregnant women and its relation with placental pathology were studied. Results obtained indicated that S/D ratio decreased gradually with advanced gestational age and showed a negative correlation (r = -0.972 8, P < 0.01). A ratio of < 3 was defined… CONTINUE READING