Fetal Middle Cerebral Artery Doppler • 22-28 weeks- no EDF in MCA • 28w to term- some EDF seen- normal • Increased EDF ( low PI) suggests ‘brain sparing’ redistribution in IUGR • Worsening hypoxia- fetal acidemia- paradoxical rise in resistance (high PI) • Cerebro-placental ratio increases – this is indicative of IUGR
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