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Randomized Controlled Trial of Vaginal Progesterone in Women With Threatened Preterm Labor

Information source: University of Calgary
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Obstetric Labor, Premature

Intervention: Vaginal progesterone (Drug); Placebo (Drug)

Phase: Phase 4

Status: Terminated

Sponsored by: University of Calgary

Official(s) and/or principal investigator(s):
Stephen Wood, MD, MSc, Principal Investigator, Affiliation: University of Calgary


Prematurity remains the most important single factor in perinatal morbidity and mortality. Unfortunately, the rate of premature delivery is increasing in Canada and is especially high in Alberta with 7. 5% of pregnancies ending before 37 weeks gestation. Despite years of research into the causes of spontaneous preterm labor, few effective treatments have been identified. Progesterone is one candidate treatment. The purpose of this study is to investigate whether progesterone can prolong pregnancy in women who have symptoms of preterm labor. Pregnant women who have symptoms of premature labor will be invited to take part in the study if they are between 22 to 24 weeks pregnant. If they agree to join the study, they will be randomly allocated to either take progesterone 200mg each day via the vagina until 36 weeks, or to take a placebo preparation. Neither the women nor their clinician will know which group they are in. Women and their babies will be followed until 28 days after the birth, to find out about the length of the pregnancy, any adverse events that might occur (none have been reported in previous trials), and to look at whether women have taken the treatment. When the study is complete, the results for the progesterone group will be compared to the placebo group. If progesterone is found to be useful in helping to prolong pregnancy, then this will be a possible treatment to help mothers in the future.

Clinical Details

Official title: Pilot Randomized Controlled Trial of Vaginal Progesterone to Prevent Preterm Birth in Women With Threatened Preterm Labor

Study design: Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment

Primary outcome: Gestational age at birth

Secondary outcome:

Proportion of women who have preterm birth <35 weeks

Proportion of women who have a preterm birth at <37 weeks

Maternal hospital length of stay (days)

Proportion of women who have hospital admission for premature labor

Maternal compliance with treatment

Neonatal hospital length of stay (days)

Neonatal morbidity

Number of days of assisted ventilation (neonate)

Number of days of supplemental oxygen (for neonate)

Birth weight (grams)

Neonatal survival to discharge home (yes/no)

Adverse events (maternal or neonate)


Minimum age: 18 Years. Maximum age: 50 Years. Gender(s): Female.


Inclusion Criteria:

- Women with symptomatic premature contractions successfully arrested for at least 12

hours with tocolytics.

- Women with symptoms suggestive of early preterm labor whose contractions resolve

without tocolysis but are fetal fibronectin positive.

- Gestational age 23(+0)-32(+6) weeks.

- Consent to taking part in the study.

Exclusion Criteria:

- Placenta previa

- Preterm premature rupture of membranes at presentation

- Pre-existing hypertension will be excluded in order to reduce the likelihood of

iatrogenic preterm delivery within the study women

- Known major fetal anomaly detected on ultrasound

- Multiple pregnancy

- Maternal seizure disorder

- Active or history of thromboembolic disease

- Maternal liver disease

- Known or suspected breast malignancy or pathology

- Known or suspected progesterone-dependent neoplasia

- Plans to move to another city during pregnancy

- Previous participation in a progesterone trial during this pregnancy

- Known sensitivity to progesterone

Locations and Contacts

Foothills Medical Centre, Calgary, Alberta T2N 4J8, Canada
Additional Information

Starting date: January 2011
Last updated: January 7, 2015

Page last updated: August 23, 2015

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