Pregnancy outcome at 24-31 weeks' gestation: mortality

Area of Science:

• Perinatal Medicine
• Neonatology
• Public Health

Background:

• Pregnancies ending between 24 and 31 weeks gestation represent a small fraction of births but a significant proportion of perinatal deaths.
• Understanding the causes and outcomes of these extremely preterm births is crucial for improving neonatal survival and care.

Purpose of the Study:

• To analyze the causes, survival rates, and neonatal outcomes of singleton births between 24 and 31 weeks gestation.
• To evaluate the effectiveness of the UK's perinatal mortality index in capturing these vulnerable births and deaths.

Main Methods:

• Retrospective study of all mothers in the Northern region delivering between 24-31 weeks gestation in 1983.
• Analysis of causes of delivery (spontaneous preterm labor, placental abruption, pre-eclampsia, premature rupture of membranes) and neonatal survival and disability rates.
• Comparison of study data with the UK perinatal mortality index.

Main Results:

• Spontaneous preterm labor, placental abruption, pre-eclampsia, and premature rupture of membranes were the primary causes for deliveries at 24-31 weeks.
• Neonatal survival rates varied by cause, with significant percentages of survivors experiencing severe disabilities.
• A substantial number of infants died before labor onset, and the existing UK perinatal mortality index excluded many unregistered births and neonatal deaths.

Conclusions:

• The current UK perinatal mortality index is inadequate for accurately reflecting the burden of mortality and morbidity in extremely preterm births.
• A more inclusive index, accounting for all infants weighing 500g or more and all neonatal deaths, is recommended for better alignment with international standards.
• Improved data capture and reporting are essential for addressing the challenges of extremely preterm deliveries.