title: Double-blind evaluation of ritodrine sustained release for oral maintenance of tocolysis after active preterm labour.
abstract: OBJECTIVE
  To evaluate the effect of ritodrine sustained release capsules for maintaining uterine quiescence after successful treatment of active preterm labour.
  
  
  METHODS
  Multicentre placebo-controlled trial.
  
  
  METHODS
  Five teaching hospitals in the Netherlands.
  
  
  METHODS
  Women (n = 95) at less than 35 weeks of gestation in whom active preterm labour had been stopped with intravenous ritodrine.
  
  
  METHODS
  Women received either two 40 mg ritodrine sustained release capsules (n = 50) or identical placebo capsules (n = 45) three times a day for seven days.
  
  
  RESULTS
  The proportion of women who received another course of active treatment was significantly smaller with the sustained release than with placebo (1 of 50 versus 11 of 45: P = 0.003) as was the number delivering because of preterm labour during treatment (0 of 50 versus 4 of 45: P = 0.04). There were no other significant differences between the two groups.
  
  
  CONCLUSIONS
  Maintenance treatment with ritodrine sustained release capsules after arrest of preterm labour reduces the risk of recurrences of preterm labour that necessitate treatment or precipitate delivery.
authors.affiliation: Department of Obstetrics and Gynaecology, bronovo Hospital, The Hague, The Netherlands.
authors.forename: C A
authors.initials: CA
authors.lastname: Holleboom
authors.forename: J M
authors.initials: JM
authors.lastname: Merkus
authors.forename: L W
authors.initials: LW
authors.lastname: van Elferen
authors.forename: M J
authors.initials: MJ
authors.lastname: Keirse
mesh_terms: D000284:Administration, Oral; D000328:Adult; D003692:Delayed-Action Preparations; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D007752:Obstetric Labor, Premature / Q000517:prevention & control*; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012312:Ritodrine / Q000008:administration & dosage*; D015149:Tocolytic Agents / Q000008:administration & dosage*; D016896:Treatment Outcome
chemical_list: D003692:Delayed-Action Preparations; D015149:Tocolytic Agents; D012312:Ritodrine