Preterm Labor Clinical Trial
Official title:
The Effect of Antenatal Corticosteroids on the Fetal Thymus - a Possible Role in Fetal Immune
Administration of corticosteroids is standard practice for pregnant patients at risk of preterm labour to reduce the risk of neonatal respiratory distress syndrome, intraventricular hemorrhage, necrotizing enterocolitis and neonatal mortality. However, there is an unknown effect of antenatal steroids on both fetal and neonatal immune function. The purpose of this study is to demonstrate the effect of antenatal steroids on the size of the fetal thymus gland.
Women with a singleton pregnancy in the twenty-forth to thirty-fourth week of gestation who are at risk for preterm labour, requiring the administration of Betamethasone twelve milligrams intramuscularly every twenty-four hours for two doses will be included in this study along with an equal number of gestational-age matched controls not at risk for preterm delivery and therefore not requiring the administration of Betamethasone. A 2-D ultrasound assessment of the fetal thymus size with measurements of the maximum transverse diameter and thymus perimeter in the three-vessel view will be performed as a baseline measurement within 36 hours of the administration of the first dose of corticosteroids. For each patient enrolled, a gestational-age matched control will have a similar ultrasound assessment. These measurements will be repeated 2 weeks after the first baseline ultrasound, and then only patients who received corticosteroids will have subsequent ultrasound measurements every 2 weeks until delivery. ;
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