Optimal gestational age of delivery to decrease neonatal morbidity in preterm pregnancies in Korea

Area of Science:

• Neonatalogy
• Obstetrics
• Perinatology

Background:

• Preterm birth is a leading cause of neonatal morbidity and mortality.
• Established gestational age guidelines for delivery may not apply to all populations, including Korean neonates.
• Previous studies suggest improved outcomes after 34 weeks for preterm labor and 32 weeks for preterm rupture of membranes.

Purpose of the Study:

• To analyze the morbidity of preterm neonates based on gestational age.
• To determine the optimal gestational age for delivery in Korean preterm neonates following preterm labor.
• To compare optimal delivery timing with existing international recommendations.

Main Methods:

• Retrospective analysis of medical records from Seoul St. Mary's Hospital (1995-2007).
• Inclusion of preterm neonates and their mothers.
• Stratification of data by singleton and multiple births.

Main Results:

• 1- and 5-min Apgar scores were significantly lower before 35 weeks (singletons) and 33 weeks (multiples).
• Major complications like intraventricular hemorrhage and respirator use decreased significantly after 35 weeks (singletons) and 33 weeks (multiples).
• Maternal characteristics did not significantly differ by gestational age.

Conclusions:

• Optimal gestational age for reducing major complications in Korean preterm neonates is 35 weeks for singletons and 33 weeks for twins.
• For singletons with preterm rupture of membranes, delivery should be delayed until 32 weeks.
• These findings suggest a need for population-specific gestational age guidelines for preterm delivery.