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About
The purpose of the study is to assess the efficacy, safety and pharmacokinetics (PK) of recombinant human antithrombin (ATryn) in addition to expectant management for the treatment of preterm preeclampsia (PPE). Efficacy will be assessed by comparing the difference in extension of gestational age from the time of randomization into the study until delivery between ATryn and placebo treated subjects. In addition, the effect of ATryn on fetal and neonatal clinical outcomes will be assessed. The PK characteristics of ATryn in the subjects will be investigated by measuring AT activity levels in the mother during treatment and in cord blood.
Full description
Hospitalized PPE patients who are being expectantly managed, after initial assessment and stabilization period, will be considered for the study. After informed consent has been obtained subjects will be screened for eligibility. Screening includes obtaining the subject's medical/obstetric history and a physical examination which includes an assessment of maternal and fetal status. Blood samples for hematology, clinical chemistries, biomarkers, coagulation, immunogenicity and AT activity levels will be drawn. Urine will be collected for baseline urinalysis, protein/creatinine ratio and biomarkers. Eligible subjects who meet inclusion/exclusion criteria will be randomized in a 1:1 ratio to receive a continuous infusion of either ATryn or placebo.
Sampling for AT activity will be performed immediately prior to the first dose of study drug and at specified times thereafter.
Subjects will continue on study drug until maternal and/or fetal indications for delivery necessitate cessation of expectant management or until 34 0/7 weeks of gestation. The average extension of pregnancy with standard of care expectant management in this patient population is approximately 7 days. It is assumed that treatment with ATryn will provide an additional increase in gestational age of 5-7 days as compared to this standard of care. Total duration on study drug is therefore estimated to be approximately 7 to 14 days on average.
Post treatment assessments of the mother will be performed at hospital discharge and approximately 4-6 weeks after delivery of the neonate. Information on the neonates will be collected until they reach a post-menstrual age (PMA) of 36 weeks. If the neonate reaches 36 weeks PMA < 28 days following delivery, the final neonatal follow-up visit should be done at the 4-6 week post-delivery visit.
After the primary study completion and follow-up period, the neonate total number of days in the Neonatal Intensive Care Unit (NICU), days on a ventilator, days requiring supplemental oxygen (FiO2 ≥21%),the neonate hospital discharge date and whether the neonate is discharged from the hospital with a requirement for supplemental home oxygen therapy will be collected to help assess health care utilization. In addition, the date of death will be collected if the neonate expires before hospital discharge. These data will be considered supplemental to the primary study data set.
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Inclusion criteria
Hospitalized female pregnant patients of gestational age of ≥23 0/7 weeks to ≤30 0/7 weeks (for subjects at gestational age 23 0/7 to 23 6/7 all standard interventions including antenatal steroids and cesarean for fetal indications must be offered).
Gestational age determination by local practice using one of the following three approaches:
At least 16 years of age (NOTE: different age restrictions may apply per local regulation and/or ethical considerations; subjects under the local age of consent may be excluded at the discretion of the reviewing Institutional Review Board (IRB)
Recent diagnosis of Preeclampsia or Superimposed Preeclampsia as defined by:
• For Preeclampsia
Gestational hypertension defined as a recorded systolic blood pressure (BP) of
≥140 mm Hg or diastolic BP of ≥90 mm Hg on 2 occasions at least 4 hours apart (since the commencement of medical intervention in any facility) OR
Severe gestational hypertension defined as systolic blood pressure of ≥ 160 mm Hg or diastolic blood pressure ≥ 110 mm Hg, confirmed with second assessment within a short interval (minutes) AND
New onset of any of the following:
For Superimposed preeclampsia:
The start of antihypertensive medication, increasing the dose of a currently administered antihypertensive medication or adding a second antihypertensive medication after 20 weeks of pregnancy for systolic BP ≥ 160 or diastolic BP ≥ 105 in a patient that had a previous history of controlled hypertension before 20 weeks of pregnancy. AND
New onset of any of the following:
In the opinion of the investigator the patient has demonstrated sufficient clinical stability to be eligible for expectant management
The patient is expected to be managed as an inpatient until delivery
Signed informed consent for both subject and neonate
Exclusion criteria
Criteria that would likely require immediate delivery of the fetus are exclusionary if present just prior to randomization:
Known lethal or major fetal anomaly
Recent (within 12 months) history of maternal alcoholism or drug dependence
Diagnosis of epilepsy
Has need for chronic therapy with nonsteroidal anti-inflammatory drugs (NSAIDs) including selective cyclooxygenase (Cox)-2 inhibitors, or unwilling to abstain from use of NSAIDs during the study treatment period (low dose aspirin of 81 mg/day or less allowable)
Received within 72 hours or has requirement for heparin; low molecular weight heparins such as enoxaparin or dalteparin; fondaparinux; antiplatelet agents such as clopidogrel, prasugrel, or high dose aspirin (>81 mg/day); Direct Thrombin Inhibitors (DTI) such as dabigatran
Pre-existing renal disease, documented pre-pregnancy or in pregnancy prior to 20 weeks gestation (prior to the diagnosis of preeclampsia) or 24 hr urine of ≥0.3 gm/24 hours, documented in pregnancy, prior to 20 weeks gestation or ≥2+ dipstick or ≥ 0.3 Protein Creatinine Ratio (PCR), documented in pregnancy at the last available test prior to 20 weeks gestation. In the case of conflicting results between dipstick, PCR, and timed urine collection tests to work up an episode of proteinuria, the timed urine collection result would supersede other results
Multi-fetal pregnancy
History of Antiphospholipid antibody syndrome
Known hypersensitivity to goat and goat milk proteins
Participation in another interventional clinical trial of an investigational, unapproved therapy (drug, biologic, device) within 30 days of consent
Primary purpose
Allocation
Interventional model
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120 participants in 2 patient groups, including a placebo group
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Data sourced from clinicaltrials.gov
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