Improving 1-year survival at 22 weeks gestation: which perinatal interventions matter?

Area of Science:

• Neonatalogy
• Perinatal Medicine
• Public Health

Background:

• Identifying effective interventions for extremely preterm infants (22-week gestation) is crucial for improving survival at the borderline of viability.
• Proactive life-prolonging care requires evidence-based guidance for patient counseling and management.

Purpose of the Study:

• To evaluate the impact of specific perinatal interventions on 1-year survival rates in 22-week live births.
• To determine the cumulative effect of multiple interventions on neonatal outcomes.

Main Methods:

• Analysis of the U.S. National Vital Statistics System Natality Data (2019-2022) for singleton live births at 22 weeks gestation.
• Inclusion criteria: presence of at least one intervention (antenatal corticosteroids, cesarean delivery, NICU admission, ventilation, antibiotics, surfactant therapy).
• Cox proportional hazards regression models were used to estimate adjusted hazard ratios for 1-year mortality, controlling for covariates.

Main Results:

• A dose-response relationship was observed: infants receiving 2-3 or ≥4 interventions had significantly improved 1-year survival compared to those receiving only one intervention.
• Individual interventions significantly associated with improved survival included antenatal corticosteroids, cesarean delivery, NICU admission, and neonatal antibiotics.
• Survival benefits showed improvement over time (2019-2022), independent of the number or type of interventions.

Conclusions:

• Antenatal corticosteroids, cesarean delivery, NICU admission, and neonatal antibiotics are individually linked to better 1-year survival for 22-week infants.
• The cumulative effect of multiple interventions demonstrates a significant positive impact on survival outcomes.
• Findings can inform clinical decision-making and patient counseling for high-risk pregnancies at the cusp of viability.