Myometrial thickness according to uterine site, gestational age and prior cesarean delivery

Abstract

Objective. To evaluate the myometrial thickness (MT) of multiple uterine sites during all three trimesters of pregnancy in an attempt to identify anticipated myometrial thickness in each trimester for these sites.Methods. In this prospective cross sectional study, MT was evaluated by ultrasound in women with viable singleton pregnancies. Women with suspected abruption, accreta, previa, fibroids, uterine and fetal anomalies, abnormal fluid volume, labor were excluded. MT was measured at the fundus, anterior wall (AW), posterior wall (PW), right and left side walls, lower uterine segment (LUS) and under the placenta. The cohort was divided to determine differences in MT at each site in each trimester (TRI). Differences in MT between sites were assessed.Results. One hundred and seventy five women underwent ultrasound by a single observer. There were 25 1st, 100 2nd and 50 3rd TRI scans at mean (SD) gestations of 11.0 (1.9), 21.5 (3.6) and 34.1 (3.0) weeks, respectively. Women were 37% African American, 72% g...