Guidelines for the management of postterm pregnancy

Area of Science:

• Maternal-Fetal Medicine
• Obstetrics
• Perinatology

Background:

• Postterm (PT) pregnancy, occurring at 42 completed weeks, is associated with increased fetal, maternal, and neonatal risks.
• While risks escalate beyond 41 weeks, pregnancy prolongation itself isn't definitively the primary risk factor; restricted fetal growth and malformations are significant.
• Ultrasound dating in early pregnancy reduces PT diagnoses compared to last menstrual period dating.

Purpose of the Study:

• To evaluate the efficacy of routine induction before 42 weeks for preventing PT complications.
• To compare outcomes of routine induction versus expectant management for postterm pregnancies.
• To inform clinical decision-making regarding postterm pregnancy management.

Main Methods:

• Review of evidence regarding risks associated with postterm pregnancy.
• Analysis of studies comparing routine induction with expectant management.
• Consideration of specific risk factors like fetal growth restriction and malformations.

Main Results:

• No conclusive evidence supports routine induction before 42 weeks improving fetal, maternal, or neonatal outcomes over expectant management.
• The number of inductions required to prevent a single stillbirth is substantial.
• It remains unclear if cesarean section rates differ between induction and expectant management strategies.

Conclusions:

• After excluding specific risks, informed patient choice is appropriate for postterm pregnancy management.
• If induction is chosen, cervical ripening methods are recommended, particularly for nulliparous women.
• Close intrapartum fetal surveillance is advised regardless of labor induction status.