Repeat induction of labour for post-term pregnancy.

Area of Science:

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

Background:

• Previous post-term pregnancy is a known risk factor for subsequent pregnancies.
• Adverse maternal and perinatal outcomes are linked to post-term births.
• Routine induction of labor by 42 weeks is recommended to mitigate complications.

Purpose of the Study:

• To determine the recurrence rate of post-term pregnancy.
• To assess the likelihood of requiring repeat induction of labor in subsequent pregnancies.

Main Methods:

• Observational cohort study using data from 1986-2012.
• Inclusion criteria: women with first and second singleton pregnancies.
• Logistic regression analysis to evaluate post-term recurrence and induction rates.

Main Results:

• 35.7% of women with a first post-term pregnancy had a subsequent post-term pregnancy, versus 18.6% of women with an initial term pregnancy (aOR 2.27).
• Women induced post-term in their second pregnancy had significantly higher odds of prior post-term induction (aOR 6.08).

Conclusions:

• A history of post-term pregnancy increases the risk of recurrence and repeat induction.
• Women with a prior post-term pregnancy are less likely to initiate spontaneous labor.
• Consideration of elective induction for women with a previous post-term pregnancy may improve outcomes.