Pharmacokinetics and Modeling of Betamethasone Therapy in Threatened Preterm Birth
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 210
- 试验地点
- 2
- 主要终点
- Diagnosis of respiratory distress syndrome
研究概览
简要总结
Respiratory distress syndrome (RDS) is a life-threatening condition for premature neonates. Antenatal glucocorticoids have been used clinically in women with threatened preterm birth to accelerate lung maturation for more than 40 years. The current treatment strategy for women with threatened preterm delivery is for a standard, "one size fits all" dosing with either betamethasone (BMZ) or dexamethasone. It is well known that pregnancy introduces additional variability in response to medication therapy with different physiological changes and alterations in the activity of drug metabolizing enzymes. The objective of this project is to evaluate the pharmacokinetic (PK), pharmacodynamic, and pharmacogenetic parameters of betamethasone (BMZ) and determine the differences in response and benefit in pregnancy. An individualized dosing approach to medications in pregnancy, such as BMZ, is crucial to optimize efficacy of this important medication.
详细描述
After consent, a maternal sample of whole blood will be obtained for DNA isolation. Investigators will collect plasma samples at 4 time points on all participants. These will be done at baseline (pre-dose), and 0.5-2 hours, 4-6 hours, and 22-24 hours after the first dose of BMZ is administered. Investigators will obtain serum for estriol measurement on all participants before or within 2 hours of antenatal corticosteroid administration and about 24 hours after each dose is given (betamethasone is administered as 2 doses 24 hours apart). Investigators will obtain a saliva sample for measurement of estriol at the same times. Participants will be offered optional participation in a more detailed PK portion of the study. Participants who consent to this part of the study will have additional plasma samples obtained at a schedule of sampling of approximately 10-15 hours after the first dose and then 6-8 hours, 24, and 48 hours after the 2nd dose. One sample will be collected at each of these times. At the time of delivery, umbilical cord blood will be collected before being discarded for DNA, serum and plasma. Four placenta sections will be collected. A maternal blood sample will also be obtained for serum and plasma. If the investigators are unable to obtain umbilical cord blood, a buccal swab will be collected from the baby for DNA extraction. A chart review will be done on the infant within 30 days of birth to review and record neonatal outcomes.
研究设计
- 研究类型
- Observational
- 观察模型
- Other
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Gestational age between 23-34 weeks with a diagnosis of threatened preterm labor or preterm premature rupture of membranes, or other diagnosis with a high likelihood of preterm delivery where the provider is recommending administering antenatal corticosteroids
- •Singleton gestation
- •Live fetus at the time of enrollment
- •Being administered antenatal corticosteroids to enhance lung maturity
- •Ability to provide written informed consent to participate in the study
排除标准
- •Maternal age <18 years old
- •Major congenital anomalies
- •Known severe abruptio placentae at the time of enrollment
- •Multiple gestations
- •Hepatic failure (history of hepatic failure, cirrhosis or 2- fold increase in Aspartate Aminotransferase (AST) or Alanine Aminotransferase (ALT)
- •Renal failure (serum creatinine > 2 mg/dl)
结局指标
主要结局
Diagnosis of respiratory distress syndrome
时间窗: up to 30 days of life
The diagnosis of RDS made by the neonatologist staff based on clinical criteria
次要结局
未报告次要终点