title: Clinical significance of precipitous labor.
abstract: BACKGROUND
  Precipitous labor is defined as expulsion of the fetus within less than 3 hours of commencement of regular contractions. We retrospectively examined our cases of precipitous labor to identify the clinical significance and perinatal outcomes following precipitous labor in singleton vertex deliveries.
  
  
  METHODS
  A retrospective population-based study was conducted comparing women with singleton precipitous labor and those with labor of normal duration. We examined the clinical characteristics and outcomes by comparing patients with precipitous labor and those with labor of normal duration in 0 and two-parous singleton pregnant women.
  
  
  RESULTS
  Using a multivariate analysis, precipitous labor in nulliparous women was independently associated with teenagers (adjusted OR: 1.71, 95% CI: 0.99 - 2.95, P = 0.049), preterm delivery (adjusted OR: 1.77, 95% CI: 1.16 - 2.70, P < 0.01) and hypertensive disorders (adjusted OR: 1.77, 95% CI: 1.19 - 2.65, P < 0.01), while in two-parous women, it was independently associated with hypertensive disorders (adjusted OR: 2.64, 95% CI: 1.33 - 5.24, P < 0.01). No significant differences were noted between the two groups regarding maternal or neonatal complications on both nulliparous and two-parous women.
  
  
  CONCLUSIONS
  Although precipitous labor was associated with hypertensive disorders in singleton vertex deliveries, it was not associated with maternal or neonatal outcomes.
authors.affiliation: Department of Obstetrics and Gynecology, Japanese Red Cross Katsushika Maternity Hospital, Tokyo, Japan. Email: czg83542@mopera.ne.jp.
authors.forename: Shunji
authors.initials: S
authors.lastname: Suzuki
keywords: Hypertensive disorders; Maternal outcome; Precipitous labor