Natural Progesterone and Preterm Birth in Twins

Study Overview
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Brief Summary
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To assess the effectiveness of natural progesterone supplementation in preventing preterm births in twins.

Detailed Description
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Objective: To assess the effectiveness of natural progesterone supplementation in preventing preterm births in twins. Study Design: National multicenter randomized double blind controlled clinical trial. Setting: Six tertiary hospitals in the east of Spain (communities of Valencia and Murcia): Instituto Universitario IVI Valencia, Hospital Universitario La Fe (Valencia), Hospital Universitario Dr. Peset (Valencia), Hospital General Universitario (Alicante), Hospital Vega Baja de Orihuela (Alicante) y Hospital Virgen de la Arrixaca (Murcia). Population: 246 bichorionic biamniotic twin pregnant women divided in three groups according to the allocated randomized treatment: (I) placebo (N=82); (II) 200 mg progesterone (N=82); and (III) 400 mg progesterone (N=82). Methods: All participant women will self-administer two vaginal pessaries at bedtime containing the allocated treatment. Vaginal pessaries will be identical externally but will contain either placebo or 200 mg of natural progesterone (Laboratorios Effik, Madrid, Spain). The treatment will be applied from the 20th week until the 34th week (or until delivery if it occurred earlier). Control visits will be performed at 24, 28, 32 and 34 weeks. Pregnancies will be managed according to each local protocol. An external statistical analysis will be performed on intention to treat basis. Main outcome measure: Preterm birth rate (<37 weeks). Secondary outcome measures: very preterm birth rate (<32 weeks); cervical length measured by vaginal ultrasound at each control visit; need for tocolytic treatments; rate of preterm premature rupture of membranes; and perinatal morbidity and mortality. Estimated period of study: 2006-2008.

Official Title
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Eficacia de Los Suplementos de Progesterona Natural en la prevención Del Parto pretérmino Gemelar

Conditions
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Preterm Birth

Intervention / Treatment
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* Drug: 200 mg of Progesterone
* Drug: 400 mg Progesterone
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Bichorionic biamniotic twin pregnant women = or > 18 years old Exclusion Criteria: Single pregnancy or monochorionic twin pregnancy or triplets Chronic hepatic pathology, previous alterations in hepatic analysis during anti-contraceptive treatment; or gestational cholestasis in in previous pregnancies.Basal alterations in hepatic analysis profile. Profylactic cerclage until week 14. Basal alterations in renal analysis profile Local allergy to micronized natural progesterone Genital pathology not allowing for correct absorption of medication Fetal anomoly diagnosed after sonograph week 12 and/or 20. Smokers of more than 10 cigarettes/day Consumers of illegal substances

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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Accepts Healthy Volunteers

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: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 400 mg Progesterone<br>Approximately one third of the bichorionic biamniotic twin pregnant women randomized to the 400 mg Progesterone Group vaginal pessaries arm. | Drug: 400 mg Progesterone<br>* Administration of 400 mg Progesterone<br>|
| Experimental: 200 mg Progesterone Group<br>Approximately one third of the bichorionic biamniotic twin pregnant women randomized to the 200 mg Progesterone Group vaginal pessaries arm. | Drug: 200 mg of Progesterone<br>* Administration of 200 mg of Progesterone<br>|
| Active Comparator: Placebo<br>Approximately one third of the bichoronic biamniotic twin pregnant women were randomized to the placebo vaginal pessaries arm. | Drug: Placebo<br>* Administration of a Placebo<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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preterm birth, progesterone, twins, Preterm birth in twin gestations