Electrical Inhibition (EI): A Preliminary Study To Prevent The Uterine Contractions Of Human Preterm Labor And Preterm Birth
试验速览
- 阶段
- 1 期
- 状态
- 撤回
- 试验地点
- 1
- 主要终点
- Decrease tocodynamometric monitored preterm uterine contraction frequency
研究概览
简要总结
An electrical-inhibition (EI) uterine pacemaker device similar to an electrical heart pacemaker delivers a weak electrical current to the human uterus during active preterm labor to rapidly and safely inhibit the unwanted premature uterine contractions and possibly a preterm birth.
详细描述
Electrical intervention (EI) uses bipolar, constant-current (1-20 mA), square-wave pulses in 20% duty cycles. Women in active preterm labor have an electrode catheter placed into the posterior fornix of the vaginal canal. The EI current is given up to 80 minutes while monitoring tocodynamometric (toco) contractions and adjunct electrohysterographic (EHG) activity while continuously monitoring maternal vital signs, fetal heart rate and electrocardiogram (fECG). The study includes a pre-EI control period (C1); the EI period, when a 10-second current burst is delivered only during a contraction; and a post-EI control period (C2). The whole study will take a maximum of two hours.
The uterine toco contraction frequency and adjunct EHG electrical activity are analyzed for changes caused by EI. Changes in maternal vital signs, fetal heart rate and fECG will determine EI side-effects.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 55 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •between 24 to 34 weeks pregnant with a singleton gestation;
- •in preterm labor as defined by the American College of Obstetricians and Gynecologists and the American Academy of Pediatrics,78 as follows:
- •persistent uterine contractions (4 every 20 minutes or 8 every 60 minutes)
- •And any one or more of the following:
- •Documented cervical change
- •> 1cm cervical dilatation and progressing
- •> 80% cervical effacement
- •anticipate a normal spontaneous vaginal delivery (NSVD).
- •at least 18 years of age
- •signed a written Informed Consent Document
- •willing and able to comply with study requirements
排除标准
- •severe preeclampsia
- •severe abruption placenta
- •rupture of amniotic membranes
- •frank chorioamnionitis
- •fetal death
- •fetal anomaly incompatible with life
- •severe fetal growth restriction (EFW <5%)
- •mature fetal lung studies
- •maternal cardiac arrhythmias
- •a permanent cardiac pacemaker
- •a fetal cardiac arrhythmia
- •contraindication for tocolysis
研究组 & 干预措施
Electrical Inhibition (EI) intervention
Electrical Inhibition (EI) uterine pacemaker is activated only when there is a preterm uterine contraction. The EI uterine pacemaker delivers a 1-15mA (20mA maximum) constant direct current for only 2 seconds only while there is a preterm uterine contraction.
干预措施: Electrical Inhibition (EI) (Device)
结局指标
主要结局
Decrease tocodynamometric monitored preterm uterine contraction frequency
时间窗: 30 seconds
Measure changes in preterm uterine mechanical contraction frequency as assessed by the tocodynamometer. This will be done for the duration of the study.
次要结局
- Decrease adjunct electrohysterographic monitored preterm uterine contraction electrical activity.(20 seconds)