A Randomized Trial of Transplacental Aspirin Therapy for Early Onset Fetal Growth
试验速览
- 阶段
- 3 期
- 状态
- 撤回
- 主要终点
- Number of fetuses delivered for non-reassuring fetal status prior to 32+0 week's gestation
研究概览
简要总结
The purpose of this investigation is to evaluate the ability of maternal aspirin (ASA) therapy to prevent preterm birth for fetal indications prior to 32 weeks gestation in women with early onset Fetal Growth Restriction (FGR). Aspirin is a commonly used medication that blocks blood platelets from clumping. Aspirin crosses the placenta in a dose dependent mode. There is preliminary evidence in smaller studies that aspirin can block fetal platelet clumping and, therefore, slow down the progression of placental disease under specific circumstances. The optimal time for aspirin to work is when the fetus' placental dysfunction is still mild. The goal of this research study is to show if fetuses that receive aspirin through maternal intake at a dose shown to affect fetal platelet aggregation will be less likely to deliver before 32 weeks for fetal deterioration. The outcomes of patients that receive aspirin will be compared to women that receive standard FGR management but do not take any aspirin. The decision if a study participant receives aspirin or not will be randomly picked. Such a research study is called a randomized controlled trial.
详细描述
Early onset FGR requiring preterm delivery by 32 weeks gestation complicates 1-5% of pregnancies and is an important health problem. Over 60% of children have long-term health consequences after being delivered for early onset FGR. There is no prenatal treatment for fetal growth restriction. The current management of FGR consists of fetal surveillance to detect a decline in the baby's health and deliver when this can be safely done. In a large number of early onset FGR, premature delivery is required to prevent the fetus from becoming more compromised or even dying in the womb.
Placental dysfunction leading to early onset FGR is characterized by changes to the blood vessels of the placenta, leading to a decline in the amount of blood flow to the placenta. The arteries that run in the umbilical cord of the fetus (umbilical arteries) are important for nutrient exchange between the fetal and placental circulation. Many fetuses with early onset FGR have elevated resistance in the blood vessels entering the placenta. This results in decreased blood flow in the umbilical artery (UA). The blood flow in the umbilical artery is evaluated by a specialized ultrasound technique called Doppler ultrasound. Doppler ultrasound of the umbilical arteries examines the blood flow to see if there is evidence of abnormal blood flow into the placenta. When the amount of blood flow at the end of every pulse decreases, it is classified as elevated UA blood flow resistance. When the blood flow briefly pauses at the end of each pulse, this is called absent end-diastolic velocity (AEDV) or UA AEDV. When the blood flow reverses at the end of each pulse, this is called reversed end-diastolic velocity (UA REDV). In fetuses with elevated UA blood flow, the placenta can usually supply enough nutrients and oxygen for at least 9 weeks. After that time, delivery is typically required. The worsening of blood flow to UA AEDV, or even UA REDV, increases the risk for fetal deterioration and preterm birth within the next 2-6 weeks. Approximately, 80% of early onset FGR fetuses progress to UA AEDV, or even UA REDV, and then require delivery by 32 weeks. There is no treatment that can stop this progression which is of critical importance in determining how much time is left for the fetus before delivery will be necessary.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •Pregnant women at least 18 years old
- •Gestational age between 220/7 to 300/7 weeks
- •Fetal abdominal circumference < 10th percentile
- •Umbilical artery Doppler index elevation > 95th percentile
- •Forward umbilical artery end-diastolic flow
- •Able to understand purpose, risks/benefits, and voluntary nature of study participant
排除标准
- •Multiple pregnancy
- •Currently taking 81 mg aspirin
- •Maternal contraindication to aspirin treatment including allergy
- •Active vaginal bleeding
- •Presence of any physical fetal anomaly
- •Fetal viral infection if diagnosed by the appropriate diagnostic test
- •Fetal chromosomal abnormalities if diagnosed by invasive fetal testing
- •Need for imminent delivery
研究组 & 干预措施
ASA Group
Receives standard of care and intervention.
干预措施: Aspirin (Drug)
结局指标
主要结局
Number of fetuses delivered for non-reassuring fetal status prior to 32+0 week's gestation
时间窗: From randomization until birth, up to 38 weeks gestation
To determine the frequency of delivery prior to 32+0 weeks' gestation for abnormal fetal surveillance parameters.
次要结局
- Placental size at delivery(At time of birth, up to 38 weeks gestation)
- Birthweight percentile at delivery(At time of birth, up to 38 weeks gestation)
- Change in UA Doppler index(Baseline and weekly, up to 38 weeks gestation)
- Change in amniotic fluid index (AFI)(Baseline and weekly, up to 38 weeks gestation)
- Change in fetal heart rate decelerations(Baseline and weekly to bi-weekly, up to 38 weeks gestation)
- Change in biophysical profile score(Baseline and weekly to bi-weekly, up to 38 weeks gestation)
- Gestational age at delivery(At time of birth, up to 38 weeks gestation)