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Using Angle of Progression and Cervical Consistency Index to Predict Induction of Labor Success
||Using Angle of Progression and Cervical Consistency Index to Predict Induction of Labor Success
Labor and Delivery, Induced Labor
||Michael House, MD
||Ashley Peterson, MD
The aim of this study is to compare ultrasound measurements from women who undergo successful induction of labor (defined as a vaginal delivery or operative vaginal delivery) with those with failed induction of labor (defined as a cesarean section). We will obtain ultrasound measurements prior to start of induction. Ultrasound measurements that will be measured will be angle of progression (AOP) and cervical consistency index (CCI).
We expect to reproduce the finding of other studies and see a narrow angle of progression (<95 degrees) associated with failed induction of labor and a wide angle of progress (>120 degrees) associated with successful induction. We also expect to find an inverse relationship between CCI (measured in %) and induction success. In addition, we hypothesize that the combination of narrow AOP and low CCI has increased positive predictive value for induction sucess.
- Pregnant Female
- ≥ 24 0/7 weeks gestational age.
- History of cesarean section
- Undiagnosed vaginal bleeding
Participants will undergo ultrasound evaluation using transperineal and transvaginal probes during one session on Labor and Delivery at the time of admission to the hospital for induction of labor.