The umbilical and renal arteries were evaluated with
colour Doppler sonography in 100 normal foetuses and 39
growth restricted foetuses, and the renal artery PIs and AFIs
were compared by Yoshimura et al. [10]. They reported that
the renal and umbilical artery PIs were significantly higher
in the growth restricted foetuses with oligohydramnios than
the normal foetuses with normal AFIs. Also, they detected a
statically significant negative correlation between the renal
artery PI and AFI in growth restricted foetuses [10].