Research has shown that umbilical vein velocity is persistently lower in growth restricted fetuses. This conclusion was evident in both longitudinal and cross-sectional studies, in different sample sizes, in both intra-abdominal and intra-amniotic sampling sites and across a range of gestational ages. However, is this reduced velocity large enough to distinguish between birthweight categories? Linear mixed modelling showed a significant difference between the UCVPV of the three birthweight categories (p < 0.001) and each category had different shaped curves (p = 0.002). However, the confidence intervals of the birthweight category regression curves overlapped between 20 weeks and 1 day and 35 weeks and 1 day GA. ICC demonstrated excellent agreement within (0.99) and between sonographers (0.98). A curvilinear relationship between umbilical vein velocity and GA has been reported previous. The confidence intervals of the birthweight category regression curves overlapped during a 15 week period of crucial fetal growth. Differences between categories were not identifiable during this period inferring that UCVPV could not reliably isolate a SGA fetus.
|Publication status||Published - 21 Jun 2019|
|Event||26th Annual Conference of the Australasian Sonographers Association (ASA 2019) - Brisbane Convention and Exhibition Centre, Brisbane, Australia|
Duration: 21 Jun 2019 → 23 Jun 2019
|Conference||26th Annual Conference of the Australasian Sonographers Association (ASA 2019)|
|Period||21/06/19 → 23/06/19|