title: Elective delivery of women with a twin pregnancy from 37 weeks' gestation.
abstract: BACKGROUND
  The optimal timing of birth for women with an otherwise uncomplicated twin pregnancy at term is uncertain, with clinical support for both elective delivery at 37 weeks, as well as expectant management (awaiting the spontaneous onset of labour).
  
  
  OBJECTIVE
  To assess a policy of elective delivery from 37 weeks' gestation compared with an expectant approach for women with an otherwise uncomplicated twin pregnancy.
  
  
  METHODS
  We searched the Cochrane Pregnancy and Childbirth Group trials register (searched 8 July 2002), Cochrane Controlled Trials Register (The Cochrane Library, Issue 2, 2002) and PubMed (January 1966 to 8 July 2002).
  
  
  METHODS
  Randomized controlled trials with reported data which compared outcomes in mothers and babies who underwent elective delivery from 37 weeks' gestation in a twin pregnancy with outcomes in controls who were managed expectantly.
  
  
  METHODS
  Two reviewers independently assessed trial quality and extracted data. Outcomes listed were collected from the identified trial.
  
  
  RESULTS
  A single randomised controlled trial comparing elective induction of labour at 37 weeks for women with a twin pregnancy with expectant management was identified. A total of 36 women were recruited to the trial with 17 women allocated to the induction of labour group and 19 women to the expectant management group. For primary outcomes, there were no statistically significant differences between elective induction of labour and expectant management with regards to all caesarean births (relative risk (RR) 0.56, 95% confidence interval (CI) 0.16 to 1.90), caesarean birth for fetal distress (RR 0.37, 95% CI 0.02 to 8.53), or perinatal death (RR not estimable). For secondary outcomes, there were no statistically significant differences between the two interventions with regards to haemorrhage requiring blood transfusion (RR 0.37, 95% CI 0.02 to 8.53), meconium stained liquor (RR 0.10, 95% CI 0.01 to 1.77), Apgar score of less than seven at five minutes (RR not estimable), and infant birth weight less than 2500 grams (RR 0.95, 95% CI 0.49 to 1.82).
  
  
  CONCLUSIONS
  The small trial identified was underpowered to detect the outcome measures of interest. Consequently, there are insufficient data available to support a practice of elective delivery from 37 weeks gestation for women with an otherwise uncomplicated twin pregnancy at term.
authors.affiliation: Department of Obstetrics and Gynaecology, University of Adelaide, Women's and Children's Hospital, 72 King William Road, Adelaide, South Australia, Australia, 5006. jodie.m.dodd@student.adelaide.edu.au
authors.forename: J M
authors.initials: JM
authors.lastname: Dodd
authors.forename: C A
authors.initials: CA
authors.lastname: Crowther
mesh_terms: D005260:Female; D005865:Gestational Age; D006801:Humans; D007751:Labor, Induced; D011247:Pregnancy; D011256:Pregnancy Outcome; D011272:Pregnancy, Multiple; D014427:Twins