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Intra-amniotic corticosteroids for preterm lung maturation in sheep
Timothy J m Moss1, Neil P Mulrooney, Ilias Nitsos
1Lotteries Commission Perinatal Research Laboratories, School of Women's and Infants' Health, University of Western Australia, Box M094, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia. tmoss@cyllene.uwa.edu.au
American Journal of Obstetrics and Gynecology
|November 25, 2003
Summary
Intra-amniotic corticosteroids improved fetal lung function but increased risks, making them unsuitable for clinical use. Maternal betamethasone is a safer alternative for fetal lung maturation.
Area of Science:
- Perinatal medicine
- Fetal development
- Respiratory physiology
Background:
- Antenatal corticosteroid therapy is standard for promoting fetal lung maturation.
- Investigating alternative routes of corticosteroid administration, such as intra-amniotic, may offer benefits.
- Direct fetal administration could potentially enhance lung development more effectively.
Purpose of the Study:
- To compare the efficacy of intra-amniotic betamethasone or budesonide versus maternal intramuscular betamethasone in promoting fetal lung maturation.
- To evaluate the impact of different administration routes and dosages on fetal lung function.
- To assess the safety profile, including fetal morbidity and mortality, associated with intra-amniotic corticosteroid administration.
Main Methods:
- Pregnant ewes were administered intra-amniotic betamethasone (0.5 or 2 mg/kg), intra-amniotic budesonide (0.5 or 2 mg/kg), or maternal intramuscular betamethasone (0.5 mg/kg).
- Control groups received intra-amniotic or maternal saline solution.
- Lambs were delivered at 124 days of gestation (2 or 7 days post-administration) for assessment of respiratory system compliance, ventilatory efficiency index, and surfactant levels.
Main Results:
- Maternal betamethasone, high-dose intra-amniotic betamethasone (2 mg/kg), and high-dose intra-amniotic budesonide (2 mg/kg) improved lung function by 2 days.
- Lung function improved by 7 days with maternal betamethasone or high-dose intra-amniotic budesonide (2.0 mg/kg).
- Intra-amniotic corticosteroid administration was associated with increased fetal death and respiratory morbidity.
Conclusions:
- Intra-amniotic corticosteroid administration effectively improved preterm fetal lung function.
- However, the observed increases in fetal morbidity and mortality rates indicate that this route is not suitable for clinical application.
- Maternal intramuscular betamethasone remains the preferred and safer method for antenatal corticosteroid therapy.