title: A randomized multicenter study to determine the efficacy of activity restriction for preterm labor management in patients testing negative for fetal fibronectin.
abstract: OBJECTIVE
  To assess the impact of activity restriction (AR) on the incidence of preterm birth in women treated for preterm labor testing negative for fetal fibronectin (fFN).
  
  
  METHODS
  Women who were diagnosed with preterm labor and tocolyzed with magnesium sulfate were concurrently screened with fFN for the purpose of subsequent management. Included were consenting patients with negative fFN, gestational age 23 0/7-33 6/7 weeks, cervical dilation < or =3 cm, and minimal vaginal bleeding. Patients were randomized to AR or no AR. Primary study outcome was incidence of preterm delivery and interval from randomization to delivery.
  
  
  RESULTS
  A total of 73 women with negative fFN were randomized (36 with AR, 37 without AR). The overall preterm birth rate was 40%, with 44.4% of patients with AR and 35.1% of patients without AR delivering preterm, p=0.478.
  
  
  CONCLUSIONS
  Maternal AR did not impact pregnancy outcome. The incidence of preterm birth in symptomatic women testing fFN negative was higher than previously reported.
authors.affiliation: Phoenix Perinatal Associates, Division of Obstetrix Medical Group of Arizona, AZ 85006, USA.
authors.forename: John P
authors.initials: JP
authors.lastname: Elliott
authors.forename: Hugh S
authors.initials: HS
authors.lastname: Miller
authors.forename: Suzanne
authors.initials: S
authors.lastname: Coleman
authors.forename: Debbie
authors.initials: D
authors.lastname: Rhea
authors.forename: Diana
authors.initials: D
authors.lastname: Abril
authors.forename: Karen
authors.initials: K
authors.lastname: Hallbauer
authors.forename: Niki B
authors.initials: NB
authors.lastname: Istwan
authors.forename: Gary J
authors.initials: GJ
authors.lastname: Stanziano
mesh_terms: D000328:Adult; D001510:Bed Rest; D005260:Female; D005353:Fibronectins / Q000032:analysis*; D005865:Gestational Age; D006023:Glycoproteins / Q000032:analysis*; D006801:Humans; D007231:Infant, Newborn; D008278:Magnesium Sulfate / Q000008:administration & dosage; D007752:Obstetric Labor, Premature / Q000517:prevention & control*; D011247:Pregnancy; D011256:Pregnancy Outcome; D011446:Prospective Studies; D015149:Tocolytic Agents / Q000008:administration & dosage
chemical_list: C403421:FFN protein, human; D005353:Fibronectins; D006023:Glycoproteins; D015149:Tocolytic Agents; D008278:Magnesium Sulfate