The Correlation of the Lower Placental Edge Thickness in Relation to Gestational Age at Delivery by Using Ultrasonography in Patients With Placenta Previa Accreta; A Prospective Cohort Study
The aim of our study is to determine correlation between lower placental edge thickness measured by ultrasound and gestational age at delivery and predict the risk of emergency preterm birth in patients having placenta previa accreta.
• Single, viable gestations. Gestational age \>28 weeks, \< 36 weeks.
• Confirmed diagnosis of placenta previa accreta when the placenta lies directly over the internal os based on ultrasound features among RCOG criteria as follows) RCOG,2019):
• 2D greyscale signs: loss of myometrial interface or retroplacental clear space, reduced myometrial thickness, intra-placental blood flow and intra-placental lacunae.
• 2D color Doppler signs: intra-placental blood flow, the presence of altered blood flow in the retroplacental space and aberrant vessels crossing between placental surfaces.
• First time of diagnosis of placenta previa accreta is 28-30 weeks. Previous one or more cesarean sections.