Association between Fetal Adrenal Gland Ultrasound Measurements in the 9th Month and Mode of Delivery

Abstract

Objective: Several studies have previously assessed the value of changes in the fetal adrenal gland to predict preterm labor. The aim of this study is to evaluate the correlation between fetal adrenal gland measurements after 36 weeks and obstetrical outcome. Methods: Abdominal 2D ultrasound is used to measure in transversal plane the the length of fetal zone (D1), the width (D2) and the length (D3) of fetal adrenal gland and subsequently the fetal zone enlargement (FZE), in 98 primigravida women after 36 weeks. Labor and delivery outcomes were assessed and compared to these measurements. Results: FZE changes had no association with spontaneous onset of labor. No association found between all adrenal gland measurements and delivery onset. There was a significant relationship between D1, D2, and D3 and the delivery method. Patients delivered by caesarean section had smaller fetal adrenal gland dimensions, defining D1=0.16cm, D2=0.7cm and D3=2.37 cm as cutoff levels based on ROC curves. Conclusion: The 2-dimensional measurement of the fetal adrenal gland after 36 weeks seems to predict the delivery method in low-risk primigravida women.