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a: Prediastolic notching of the uterine artery waveform (red arrow) and raised pulsatility index (PI) at 22 weeks indicates placental insufficiency and has a high positive predictive value for fetal growth restriction b: Normal umbilical artery Doppler Increasing resistance in the umbilical artery leads to the development of raised PI (c), absent (d) and then reversed end diastolic flow (e).
