Interpregnancy interval after vacuum delivery and subsequent perinatal outcomes

Area of Science:

• Obstetrics and Gynecology
• Perinatal Medicine
• Reproductive Health

Background:

• Interpregnancy intervals (IPIs) are crucial for maternal and neonatal outcomes.
• Previous research indicates risks associated with short IPIs, but data specific to vacuum extraction (VE) deliveries are limited.

Purpose of the Study:

• To investigate the perinatal risks associated with a short interpregnancy interval (<18 months) following a term vacuum extraction (VE) delivery in a subsequent pregnancy.

Main Methods:

• A retrospective cohort study included 1094 nulliparous women with term, singleton VE deliveries and subsequent pregnancy outcomes.
• Women were categorized by IPI: <18 months (n=212) and 18–60 months (n=882).
• The primary outcome was spontaneous preterm birth (PTB) <37 weeks gestation.

Main Results:

• Spontaneous PTB <37 weeks was significantly higher in the short IPI group (7.1% vs. 2.6%, P=0.002).
• Short IPI was also associated with increased risks of low birthweight <2500g (6.1% vs. 2.8%, P=0.02) and neonatal intensive care unit admission (6.1% vs. 2.6%, P=0.013).
• Younger maternal age was a risk factor for short IPI.

Conclusions:

• A short interpregnancy interval (<18 months) after term vacuum extraction delivery increases neonatal risks, particularly preterm birth, in the next pregnancy.
• These findings are critical for counseling women on optimal interpregnancy spacing.
• The study underscores the need for individualized risk assessment and guidance following VE.