Sildenafil Therapy In Dismal Prognosis Early-Onset Intrauterine Growth Restriction (STRIDERCan)

University of British Columbia

Status and phase

Terminated

Phase 3

Phase 2

Conditions

Intrauterine Growth Restriction (IUGR)

Fetal Growth Restriction (FGR)

Treatments

Drug: Sildenafil

Drug: Placebo

Study type

Interventional

Funder types

Other

Identifiers

NCT02442492

H15-00899

Details and patient eligibility

About

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.

Full description

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.

Enrollment

21 patients

Sex

Female

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Gestational age from 18+0 - 27+6 weeks

AND

EO IUGR, defined as
1. 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
2. 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