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Cited by 1,086

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Progesterone and the Risk of Preterm Birth among Women with a Short Cervix

Fonseca, Eduardo B., Celik, Ebru, Parra, Mauro, Singh, Mandeep, Nicolaides, Kypros H.·2007·New England Journal of Medicine

Abstract

BACKGROUND: Previous randomized trials have shown that progesterone administration in women who previously delivered prematurely reduces the risk of recurrent premature delivery. Asymptomatic women found at midgestation to have a short cervix are at greatly increased risk for spontaneous early preterm delivery, and it is unknown whether progesterone reduces this risk in such women. METHODS: Cervical length was measured by transvaginal ultrasonography at a median of 22 weeks of gestation (range, 20 to 25) in 24,620 pregnant women seen for routine prenatal care. Cervical length was 15 mm or less in 413 of the women (1.7%), and 250 (60.5%) of these 413 women were randomly assigned to receive vaginal progesterone (200 mg each night) or placebo from 24 to 34 weeks of gestation. The primary outcome was spontaneous delivery before 34 weeks. RESULTS: Spontaneous delivery before 34 weeks of gestation was less frequent in the progesterone group than in the placebo group (19.2% vs. 34.4%; relative risk, 0.56; 95% confidence interval [CI], 0.36 to 0.86). Progesterone was associated with a nonsignificant reduction in neonatal morbidity (8.1% vs. 13.8%; relative risk, 0.59; 95% CI, 0.26 to 1.25; P=0.17). There were no serious adverse events associated with the use of progesterone. CONCLUSIONS: In women with a short cervix, treatment with progesterone reduces the rate of spontaneous early preterm delivery. (ClinicalTrials.gov number, NCT00422526 [ClinicalTrials.gov].).

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Metadata

Authors
Fonseca, E. B., Celik, E., Parra, M., Singh, M., & Nicolaides, K. H.
Venue
New England Journal of Medicine
Published
2007-08-02
Volume
357
Issue
5
Pages
462-469
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2003105309
Cited by
1,086
References
5
FWCI
33.08
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Progesterone and the Risk of Preterm Birth among Women with a Short Cervix. https://app.cochat.ai/papers/10.1056/nejmoa067815
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Fonseca, E. B., Celik, E., Parra, M., Singh, M., & Nicolaides, K. H. (2007). Progesterone and the Risk of Preterm Birth among Women with a Short Cervix. New England Journal of Medicine. https://doi.org/10.1056/nejmoa067815

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Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.