Uterine rupture without previous caesarean delivery: a population-based cohort study

Area of Science:

• Obstetrics and Gynecology
• Reproductive Health
• Maternal-Fetal Medicine

Background:

• Uterine rupture is a rare but serious obstetric complication.
• Understanding risk factors is crucial for preventing adverse maternal and neonatal outcomes.
• Previous cesarean delivery is a known risk factor, but data on women without prior cesarean is less defined.

Purpose of the Study:

• To determine the incidence of uterine rupture in women undergoing singleton births at term without a history of cesarean delivery.
• To identify patient characteristics and delivery factors associated with uterine rupture in this population.

Main Methods:

• Population-based cohort study utilizing the Danish Medical Birth Registry (1997-2008).
• Inclusion of 611,803 women with term singleton births and no prior cesarean delivery.
• Review of medical records for confirmed cases of complete uterine rupture during labor.

Main Results:

• The incidence of complete uterine rupture was approximately 3.3 per 100,000 deliveries among women without prior cesarean.
• Multiparity (RR 8.99), labor induction (RR 3.26), epidural analgesia (RR 10.78), and oxytocin augmentation (RR 9.50) were associated with increased risk.
• Adjusted analysis indicated that labor induction was not a significant independent risk factor when controlling for parity, epidural, and oxytocin.

Conclusions:

• While rare, uterine rupture is associated with specific interventions in multiparous women.
• Vigilance is recommended when using epidural analgesia and/or oxytocin augmentation in multiparous women, especially with labor complications.
• The low incidence necessitates caution when interpreting findings due to potential statistical limitations.