Yolk sac–embryo distance in correlation with soluble form of vascular endothelial growth factor levels in pregnancy with potentially reserved evolutivity

Abstract

Aims: Embryonic demise is a frequent complication of the first trimester pregnancy. The purpose of this study was to evaluate the correlation between a serum biomarker, the soluble form of the vasculo-endothelial growth factor (sFlt-1) and the distance between the yolk sac (YS) and embryo (DYSE), determined by ultrasonography.Material and methods: The study was a prospective case-control study that included 2 groups of patients – the control group with 81 first-trimester pregnancies in evolution and the case group with 89 first-trimester pregnancies with a potentially reserved evolutivity.Results: A correlation between the serum level of sFlt-1 and DYSE in embryos with crown-rump length (CRL) greater than 5 mm was identified, showing that a DYSE ≤3 mm correlates with a low level of sFlt-1 (p<0.05) and a DYSE> 4 mm correlates with an increased level of sFlt-1 (p<0.05).Conclusions: A low level of sFlt-1 associated with a distance between the embryo and yolk sac of small dimensions, respectively <3 mm, correlates with an increased rate of non-viable embryos. This correlation between an ultrasound and a serum parameter is of great value and brings important information about the viability of firsttrimester pregnancies.