title: Effect of progesterone as a tocolytic and in maintenance therapy during preterm labor.
abstract: OBJECTIVE
  To assess the efficacy of vaginal micronized natural progesterone as a tocolytic and in maintenance therapy during threatened preterm birth.
  
  
  METHODS
  Eighty-three women with symptoms of threatened preterm birth were either randomized to study groups receiving tocolytic treatment combined with intravaginal micronized natural progesterone (200 mg daily) or to a control group receiving only tocolysis.
  
  
  RESULTS
  Micronized natural progesterone treatment resulted in a prolonged latency period of 32.1 ± 17.8 versus 21.2 ± 16.3 days in the control group and heavier birth weights of 2,982.8 ± 697.8 g versus 2,585.3 ± 746.6 g. No significant differences were found between the groups in admission to the neonatal intensive care unit, stay at the neonatal intensive care unit, need for a mechanical ventilator, respiratory distress syndrome or neonatal sepsis.
  
  
  CONCLUSIONS
  The treatment of threatened preterm birth with tocolytics combined with intravaginal micronized natural progesterone significantly prolonged pregnancy and increased birth weight. However, an improvement in adverse perinatal outcomes was not observed.
authors.affiliation: Department of Gynecology and Obstetrics, Faculty of Medicine, Zonguldak Karaelmas University, Zonguldak, Turkey. driarikan@hotmail.com
authors.forename: I
authors.initials: I
authors.lastname: Arikan
authors.forename: A
authors.initials: A
authors.lastname: Barut
authors.forename: M
authors.initials: M
authors.lastname: Harma
authors.forename: I M
authors.initials: IM
authors.lastname: Harma
mesh_terms: D000282:Administration, Intravaginal; D001724:Birth Weight; D002214:Capsules; D004359:Drug Therapy, Combination; D005260:Female; D005865:Gestational Age; D006801:Humans; D007752:Obstetric Labor, Premature / Q000188:drug therapy*; D011247:Pregnancy; D011374:Progesterone / Q000008:administration & dosage*; D011372:Progestins / Q000008:administration & dosage*; D012312:Ritodrine / Q000008:administration & dosage*; D015149:Tocolytic Agents / Q000008:administration & dosage*; D016896:Treatment Outcome
chemical_list: D002214:Capsules; D011372:Progestins; D015149:Tocolytic Agents; D011374:Progesterone; D012312:Ritodrine