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In 32 pregnancies complicated by intra-uterine growth retardation, umbilical venous blood was sampled by cordocentesis and the utero-placental blood velocity resistance index (RI) was recorded using Doppler ultrasound. Significant correlations were found between the utero-placental RI and fetal hypoxia, hypercapnea, acidosis, hyperlactaemia and erythroblastosis.
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Soothill et al. (1986) studied this question.
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