title: Progesterone effects on preterm birth in high-risk pregnancies: a randomized placebo-controlled trial.
abstract: OBJECTIVE
  The purpose of this study was to evaluate whether the prophylactic administration of vaginal progesterone would reduce the preterm birth rate in high-risk population including singleton and twin pregnancies.
  
  
  METHODS
  This was a randomized, double blind, placebo-controlled study that included 150 high-risk pregnancies. Risk groups included prior spontaneous preterm birth, twin pregnancy, and uterine malformation. Micronized progesterone or placebo (100 mg) was administered daily by vaginal suppository between 24 and 34 weeks of gestation. We compared progesterone and placebo groups for incidence of preterm labor and preterm delivery. Data were compared by χ² analysis and Fisher exact test.
  
  
  RESULTS
  There was a statistically significant difference in the rate of preterm labor between placebo and progesterone groups (45.7 vs. 25%, respectively; p < 0.05). More women delivered before 37 weeks in placebo group (57.2%) than in progesterone group (40%; p < 0.05). Administering progesterone also reduced the preterm birth before 34 weeks of gestation. The difference between placebo and progesterone group was statistically significant (24.3 vs. 8.8%; p < 0.05). However, there was no significant difference in neonatal death between placebo and progesterone groups.
  
  
  CONCLUSIONS
  Prophylactic vaginal progesterone reduced the rate of preterm labor and preterm delivery in high-risk pregnancies.
authors.affiliation: Department of Obstetrics and Gynecology, Zeynep Kamil Women and Children Diseases Education and Research Hospital, Uskudar, Istanbul, Turkey. elcincet@hotmail.com
authors.forename: Elcin
authors.initials: E
authors.lastname: Cetingoz
authors.forename: Cetin
authors.initials: C
authors.lastname: Cam
authors.forename: Mustafa
authors.initials: M
authors.lastname: Sakallı
authors.forename: Ates
authors.initials: A
authors.lastname: Karateke
authors.forename: Cem
authors.initials: C
authors.lastname: Celik
authors.forename: Ali
authors.initials: A
authors.lastname: Sancak
mesh_terms: D000282:Administration, Intravaginal; D000293:Adolescent; D000328:Adult; D015992:Body Mass Index; D005260:Female; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D018566:Pregnancy, High-Risk / Q000187:drug effects*; D047928:Premature Birth / Q000517:prevention & control*; D011374:Progesterone / Q000008:administration & dosage*; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D011374:Progesterone