Sildenafil Therapy In Dismal Prognosis Early-Onset Intrauterine Growth Restriction

Study Overview
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Brief Summary
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Early-onset placental intrauterine growth restriction (EO IUGR) is associated with a high risk of perinatal morbidity and mortality. In association with reduced circulating placental growth factor (PlGF) EO IUGR results from abnormal placentation with inadequate remodelling of the maternal uteroplacental arteries. There is no known treatment for placental IUGR. Management involves intensive fetal surveillance with delivery with evidence of serious fetal compromise. However, remote from term, delivery is associated with significant perinatal mortality and morbidity. Sildenafil vasodilates the uteroplacental vessels of IUGR-affected pregnancies and may represent a novel therapy.

Detailed Description
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STRIDER Canada is one of a consortium of STRIDER randomised controlled trials (RCTs) each of which is designed to determine whether or not maternal treatment with oral sildenafil citrate improves perinatal outcomes in pregnancies complicated by EO IUGR without increasing risks to the mother. STRIDER Canada is designed as investigator-initiated double-blind, randomised placebo-controlled trial of 90 women with a diagnosis of early-onset intrauterine growth restriction with an intention-to-treat analysis. 90 Women with affected pregnancies will be recruited and randomised to receive either sildenafil or placebo. Women reviewed in the participating fetal medicine with a diagnosis of a pregnancy affected by early-onset IUGR between 18+0 and 27+6 weeks of gestation and serum PlGF levels less than 5th percentile for gestational age will be considered for randomisation. In Canadian STRIDER, the treatment with either sildenafil or placebo (25 mg 3 times per day) will be applied from the time of randomisation until delivery, or up to 31+6 weeks of gestation whichever comes first. All patients randomly assigned to one of the treatments will be analysed together, regardless of whether or not they completed or received that treatment, on an intention to treat basis.

Official Title
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STRIDER Canada: A Randomized Controlled Trial of Sildenafil Therapy In Dismal Prognosis Early-Onset Intrauterine Growth Restriction (Canada)

Conditions
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Intrauterine Growth Restriction (IUGR), Fetal Growth Restriction (FGR)

Intervention / Treatment
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* Drug: Sildenafil
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Gestational age from 18+0 - 27+6 weeks AND EO IUGR, defined as ultrasound (U/S) measurement of the fetal abdominal circumference (AC) <10th percentile for gestational age and/or documented reduced fetal growth velocity complicating either a prior EO IUGR with adverse perinatal outcome or abnormal uterine artery waveform in the index pregnancy; OR U/S estimate of fetal weight (EFW) <700g AND Serum PlGF < 5th percentile for gestational age Exclusion Criteria: known fetal aneuploidy known fetal anomaly/syndrome/congenital infection confirmed at the time of enrolment decision made to terminate pregnancy current cocaine or vasoconstrictor use (e.g. crystal meth) (risk of acute cardiac events) contraindication to sildenafil therapy, e.g. known significant maternal cardiac disease, left ventricular outflow tract obstruction, concomitant treatment with nitrates or previous allergy to sildenafil known HIV positive status (due drug-drug interaction between sildenafil and antiretrovirals) receiving peripheral alpha-blockers (e.g. prazosin) prior participation in a STRIDER trials pre-eclampsia or gestational hypertension diagnosed

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Sildenafil<br>Sildenafil 25 mg tablets three times daily orally from randomization until delivery or 31+6 weeks of gestational age, whichever is sooner. | Drug: Sildenafil<br>* Sildenafil 25 mg tablets three times daily orally from randomization until delivery or 31+6 weeks of gestational age, whichever is sooner.<br>|
| Placebo Comparator: Placebo<br>Placebo 25 mg tablets three times daily orally from randomization until delivery or 31+6 weeks of gestational age, whichever is sooner. | Drug: Placebo<br>* Placebo 25 mg tablets three times daily orally from randomization until delivery or 31+6 weeks of gestational age, whichever is sooner.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| compare the gestational age at delivery (d) between sildenafil- and placebo-treated groups |  | 6 weeks after postpartum | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| live birth |  | at delivery if alive | 
| survival to hospital discharge |  | measured at the final hospital discharge (average upto 6 weeks postpartum) | 
| intact survival (defined as survival to estimated due date (EDD) without evidence of severe central nervous system [CNS] injury [by ultrasound and/or magnetic resonance imaging (MRI)]) |  | measured at estimated due date (EDD) | 
| composite non-CNS (Central Nervous System) severe morbidity (one/more of bronchopulmonary dysplasia requiring supplemental oxygen on hospital discharge, ≥grade 3 retinopathy of prematurity, or necrotising enterocolitis) |  | up to 6 weeks after postpartum or final discharge which ever is sooner | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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FGR, sildenafil, IUGR, STRIDER