- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04110444
Sildenafil Citrate Added to Low Molecular Weight Heparin and Low Dose Aspirin in High-risk Pregnancy
Sildenafil Citrate Added to Low Molecular Weight Heparin and Low Dose Aspirin to Improve Uteroplacental Perfusion in High-risk Pregnancy
Study Overview
Detailed Description
Pregnancy is considered an acquired hypercoagulable state due to increased concentration of coagulation factors, decreased levels of anticoagulants and decreased fibrinolytic capacity. Adverse pregnancy outcomes affect up to 15% of gestations and are the major cause of maternal and fetal morbidity and mortality. A poor perinatal outcome is expected in pregnancies with high vascular resistance in uterine circulation, but the pregnancies in which the resistance values are normalized in the later trimesters have a significantly better outcome.
For the prevention of fetal growth restriction, a recent large-study level meta-analysis and individual patient data meta-analysis confirm that aspirin modestly reduces small-for-gestational-age pregnancy in women at high risk (relative risk, 0.90, 95% confidence interval, 0.81-1.00) and that a dose of ≥100 mg should be recommended and to start at or before 16 weeks of gestation. Moreover, in vitro and in vivo studies suggest that low-molecular-weight heparin may prevent fetal growth restriction; however, evidence from randomized control trials is inconsistent.
In a normal pregnancy, the trophoblast produces nitric oxide (NO) which plays an important role in vasodilatation in the fetoplacental circulation to improve oxygen and nutritional supply to the fetus (9,10). Nitric oxide relaxes arterial and venous smooth muscle potently and might inhibit platelet aggregation and adhesion. Moreover, increased circulating phosphodiesterase (PDE) activity is suspected in women with preeclampsia. In pregnancies with fetal growth restriction and without preeclampsia, a reversible increased myometrial arterial tone by phosphodiesterase inhibition has been reported in vitro.
Phosphodiesterase type 5 inhibitors that potentiate nitric oxide availability such as sildenafil citrate have been extensively researched both in preclinical and clinical studies; Sildenafil citrate is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase (PDE)-5 leading to cyclic guanosine monophosphate (cGMP) accumulation and enhances the relaxation elicited by exogenous and neural-released nitric oxide in corpus cavernous. Sildenafil citrate increases uterine blood flow and potentiates estrogen-induced vasodilatation. Intravaginal administration of Sildenafil in the success of in vitro fertilization describes no deleterious effects on mother and fetus. The Natural Killer Cells activity and endometrial thickness were significantly changed after vaginal Sildenafil therapy so it might be an interesting therapeutic option before conception in women with recurrent reproductive failure.
Reduced flow / increased resistance in uterine and umbilical arteries, indicative of reduced uteroplacental flow in pregnancies with fetal growth restriction, has been documented by non-invasive Doppler ultrasound velocimetry.
Study Type
Contacts and Locations
Study Locations
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Fayoum, Egypt
- sahar M.Y elbaradie
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- high-risk pregnant women (women with current preeclampsia, IUGR and oligohydramnios)
- gestational age 28-37 weeks
- no major medical illness contraindicating sildenafil use (cardiovascular disease, sickle cell anaemia, retinopathy, hearing loss, liver diseases)
- willingness to sign informed consent for study randomization
Exclusion Criteria:
- gestational age less than 28 weeks
- refusal of Doppler studies or sildenafil use
- contraindication or allergy to sildenafil
- those who can't present for monitoring visits or follow medication instructions
- those with major medical illness including cardiovascular disease and diabetes mellitus
- multiple pregnancies
- suspected chromosomal or fetal congenital anomalies (documented by level II ultrasound examination)
- users of any vasodilator agents
- those who had maternal or fetal emergencies necessitating delivery at time of recruitment in the study or with diastolic blood pressure more than 110 mmHg
- BMI is more than 34 that would impede accurate measurement of fetal biometry and Doppler parameters
Study Plan
How is the study designed?
Design Details
- Observational Models: Other
- Time Perspectives: Other
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
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sildenafile group A
received sildenafil citrate orally 20mg every 8 hours based on previous studies18,21 (Respatio tablet, pharma Egypt group) in addition to low molecular weight heparin daily according to the bodyweight at the booking visit (Clexane 20,40,60 mg, Sanofi eventis company) plus small dose of aspirin 75 mg (Aspocid 75mg tablet, CID pharmaceutical) once daily
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oral sildenafil t.d.s for high-risk pregnancies
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control group B
received low molecular weight heparin as subcutaneous injection once daily plus low dose aspirin 75mg orally once daily in addition to placebo three times daily prepared by a local pharmacy from a domestic manufacturer
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
change in abdominal circumference and estimated fetal weight after 2 weeks of therapy
Time Frame: two weeks
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ultrasound assessment of fetal growth
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two weeks
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
amniotic fluid index 5-15 cm with minimum increase of 2 cm
Time Frame: two weeks
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ultrasound assessment of amniotic fluid
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two weeks
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Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- SMElbaradie
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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