Antenatal corticosteroids and cranial ultrasonographic abnormalities

Area of Science:

• Neonatal Medicine
• Developmental Neuroscience
• Pediatric Neurology

Background:

• Very-low-birth-weight infants face significant risks of neurodevelopmental dysfunction.
• Cranial ultrasonography identifies key abnormalities like intraventricular hemorrhage, echolucent images, and ventriculomegaly.
• Antenatal corticosteroids are a known intervention to improve neonatal outcomes.

Purpose of the Study:

• To investigate the impact of maternal antenatal corticosteroid exposure on specific cranial ultrasonographic abnormalities in very-low-birth-weight infants.
• To determine if antenatal corticosteroids reduce the risk of intraventricular hemorrhage, echolucent images, and ventriculomegaly.
• To assess if the protective effect varies based on the extent of corticosteroid exposure (none, partial, complete).

Main Methods:

• Retrospective cohort study of 1604 infants (500-1500g) undergoing cranial ultrasonography.
• Infants categorized by maternal antenatal corticosteroid exposure: none, partial, or complete course.
• Review of infant and maternal hospital records to determine exposure and outcomes.

Main Results:

• A full course of antenatal corticosteroids showed a modest, non-significant reduction in intraventricular hemorrhage and echolucent images.
• Antenatal corticosteroids significantly reduced the risk of ventriculomegaly, even after a partial maternal course.
• The protective effect against ventriculomegaly and echolucent images was amplified in preterm infants and those with specific complications (e.g., intraventricular hemorrhage, hypothyroxinemia).

Conclusions:

• Maternal antenatal corticosteroid administration appears to protect very-low-birth-weight infants from cranial ultrasonographic abnormalities.
• The benefits are particularly evident in the most vulnerable neonates, including the gestationally youngest.
• These findings support the use of antenatal corticosteroids to mitigate risks of adverse neurodevelopmental outcomes in high-risk infants.