Intrauterine Growth Restriction Clinical Trial
Official title:
Diagnostic Value of sFlt-1/PlGF Ratio for the Etiology of Intra Uterine Growth Restriction
The main aim of this project is to determine the Placental Growth Factor and Vascular Endothelial Growth Factor ratio's performance (sFlt-1/PlGF) for the etiological diagnosis of vascular Intrauterine growth restriction (IUGR) compared to a non-vascular IUGR.
Intra-uterine growth restriction is one of the most frequent cause of consultation in prenatal diagnosis centers. Suspected Intrauterine growth restriction (IUGR) concerns 5.4% of pregnancies. Prognosis and management of IUGR depends on its etiology. It has been estimated that 80 to 90% of IUGR have a vascular cause, 5-15% an infectious cause and 2 to 5% chromosomal or genetic cause. More recently, a meta-analysis has shown that among 874 IUGR fetuses for whom amniocentesis was performed, anomaly of caryotype or comparative genomic hybridization array was reported for 6%. In case of vascular IUGR, amniocentesis is not indicated and close surveillance of mother and fetus is organized. The diagnosis of vascular IUGR is most often confirmed after birth with placental histology. Before birth, the diagnosis of vascular IUGR is presumptive, and based on gestational age at diagnosis, quantity of amniotic fluid, end dopplers of umbilical artery and uterine arteries. The argument considered as most specific of vascular IUGR is the doppler of uterine arteries, however it has been shown that sensitivity of this test is weak : abnormal uterine arteries is reported in only 40% of fetuses with vasculat IUGR according to placenta pathology. Biochemical markers Placental Growth Factor and Vascular Endothelial Growth Factor (sFlt1 and PlGF) have shown their prognostic value on the occurrence of preeclampsia. They are both associated to the delay until occurrence of preeclampsia and to the delay before extraction in case of IUGR. As diagnostic tool in IUGR, only two studies have investigated their value : the PlGF/sFlt-1 ratio identified 7 patients among 10 with abnormal placental pathology, and low PlGF value is associated with abnormal placental pathology among 122 cases of IUGR, however this study did not specify sensitivity and specificity values. A reliable and reproductible marker that could orient practitioners towards the need to propose amniocentesis at diagnosis of IUGR is therefore important to develop. The main objective of ANGIOPAG is to determine the sFlt-1/PlGF ratio's performance for the etiological diagnosis of vascular IUGR compared to a non-vascular IUGR. To reach this goal, ANGIOPAG is a diagnostic, multicenter, non-randomized study. It will be performed on 152 pregnant women over 18 with a term between 22and 34 +6 Weeks of Gestation (WG), consulting in participating centers for IUGR. For the research, a blood test will be carried, at the inclusion and 2 to 4 weeks after, to determine sFLT-1 and PlGF. All included patients'placenta will be analyzed, even in case of a child normal birth weight. ;
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