Full dilation cesarean section: a risk factor for recurrent second-trimester loss and preterm birth

Area of Science:

• Obstetrics and Gynecology
• Reproductive Medicine
• Perinatal Research

Background:

• A previous cesarean section at full dilation (FDCS) is a known risk factor for preterm birth.
• Understanding the risks to subsequent pregnancies after FDCS is crucial for perinatal care.

Purpose of the Study:

• To compare pregnancy outcomes in women with a prior term FDCS versus a prior term vaginal birth.
• To assess the risk of recurrent spontaneous preterm birth (sPTB) in a third pregnancy.

Main Methods:

• A cohort study identified women with a late miscarriage or sPTB following a term delivery.
• Cases had a prior term FDCS; controls had a prior term vaginal birth.
• Main outcomes: gestational age at delivery and delivery before 30 weeks in the next pregnancy.

Main Results:

• Women with a prior term FDCS had a significantly higher risk of recurrent sPTB before 30 weeks (RR 3.06).
• Median gestational age at delivery was significantly lower in the FDCS group (249 days vs. 280 days).
• Vaginal cerclage was used in 11 women with prior FDCS, with 5 delivering before 37 weeks.

Conclusions:

• Women with a term FDCS followed by late miscarriage/sPTB face an elevated risk of recurrent sPTB.
• This finding highlights the importance of careful monitoring in pregnancies following FDCS.