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Published on: June 6, 2020
Low-risk pregnancy at 41 weeks: when should we induce labor?
Daniel Oros1, María Pilar Bejarano, Manolo Romero Cardiel
1Department of Obstetrics and Gynecology, Hospital Clinico Universitario Lozano Blesa, Zaragoza, Spain. dorosl@salud.aragon.es
Summary
Induction of labor at 41 weeks in low-risk pregnancies reduced small-for-gestational age babies but increased C-sections and hospital stays. This study offers insights into managing prolonged pregnancies.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Perinatal Outcomes
Background:
- Prolonged pregnancy, defined as gestation reaching 41 weeks, necessitates careful management in low-risk cases.
- Understanding the impact of labor induction versus expectant management on perinatal outcomes is crucial.
Purpose of the Study:
- To compare perinatal outcomes in low-risk pregnancies at 41 weeks gestation, specifically examining induction of labor versus non-induction.
- To evaluate the effects of early labor induction on rates of small-for-gestational age (SGA) babies, C-section delivery, and hospital stay.
Main Methods:
- A quasi-experimental study involving 1,721 low-risk singleton pregnancies.
- Participants were informed of risks and benefits, with 629 undergoing planned induction of labor soon after 41 weeks gestation.
Main Results:
- Early induction of labor was associated with a lower proportion of small-for-gestational age babies (10.5% vs. 15%).
- However, the induction group experienced longer hospital stays (4.54 vs. 3.80 days) and a higher rate of Cesarean sections (31.1% vs. 19.8%), including for failed induction (21.8% vs. 11%).
- No stillbirths occurred in the induction group, compared to three in the expectant management group.
Conclusions:
- Induction of labor after 41 weeks in low-risk pregnancies reduces the incidence of small-for-gestational age infants.
- This intervention, however, leads to increased hospital stays and a higher likelihood of Cesarean delivery, including for failed induction.
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