Antenatal Corticosteroid Therapy for Fetal Lung Maturation

Indications and Dosage

The American College of Obstetricians and Gynecologists recommends administering 12 mg of betamethasone intramuscularly in two doses 24 hours apart to pregnant women at risk of preterm birth between 24 0/7 and 34 6/7 weeks of gestation 1, 2, 3
For pregnancies between 34 0/7 and 36 6/7 weeks, administration may be considered for women at high risk of delivery within 7 days 3
The dose is recommended to be administered antenatally, not directly to the newborn after birth, to prevent neonatal respiratory complications 1, 2

Reduction in the need for respiratory support (11.6% vs 14.4%; RR 0.80) 2, 3
Decrease in severe respiratory morbidity (8.1% vs 12.1%; RR 0.67) 2, 3
Reduction in neonatal deaths, respiratory distress syndrome, intraventricular hemorrhage, and sepsis 2, 3

The American Academy of Pediatrics recommends using low-dose dexamethasone (approximately 0.2 mg/kg/day) to facilitate extubation and reduce the incidence of adverse effects associated with high-dose dexamethasone 4, 5, 6, 7
Hydrocortisone at a low dose (1 mg/kg/day) administered during the first 2 weeks of life may increase survival rates without bronchopulmonary dysplasia, particularly in infants born in a context of prenatal inflammation, without negatively affecting neurologic development 4, 5, 6, 7

Avoid repeated or routine "rescue" courses in the 24-34 week gestational age range 2
Do not use high-dose dexamethasone (≥0.5 mg/kg/day) postnatally due to neurodevelopmental risks 4, 5, 6, 7
Do not confuse antenatal indication (fetal lung maturation) with postnatal use (prevention/treatment of bronchopulmonary dysplasia) - these are distinct clinical contexts with different risk-benefit profiles 8, 4, 5