title: Intrapartum rupture of the unscarred uterus.
abstract: OBJECTIVE
  To examine risk factors and maternal and neonatal outcomes in ten cases of intrapartum rupture of the unscarred uterus.
  
  
  METHODS
  Uterine ruptures in women without previous cesarean deliveries were identified from an ongoing log for a 12-year period beginning January 1, 1983. Detailed information was obtained by review of hospital records.
  
  
  RESULTS
  From January 1, 1983, through December 31, 1994, we identified 13 uterine ruptures in women without previous cesarean deliveries. Three resulted from motor vehicle accidents and were excluded from analysis. Ten occurred during labor and are the subjects of our report. The incidence of intrapartum rupture of an unscarred uterus was 1 in 16,849 deliveries. Associated factors included oxytocin use (four cases), prostaglandin use (three cases), use of vacuum or forceps (three cases), grand multiparity (two cases), and malpresentation (two cases). Intervention was prompted by fetal heart rate decelerations in seven cases and by severe hemorrhage in three. Uterine rupture was associated with acute abdominal pain in six cases, maternal tachycardia in five, and severe hypotension in two. Neonatal outcomes were normal in nine cases. There were no maternal or perinatal deaths.
  
  
  CONCLUSIONS
  Intrapartum rupture of the unscarred uterus is a rare obstetric emergency. Maternal and perinatal outcomes are optimized by awareness of risk factors, recognition of clinical signs and symptoms, and prompt surgical intervention.
authors.affiliation: LAC + USC Women's and Children's Hospital, Department of Obstetrics and Gynecology, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Miller
authors.forename: T M
authors.initials: TM
authors.lastname: Goodwin
authors.forename: R B
authors.initials: RB
authors.lastname: Gherman
authors.forename: R H
authors.initials: RH
authors.lastname: Paul
mesh_terms: D000328:Adult; D001720:Birth Injuries / Q000209:etiology; D015984:Causality; D002585:Cesarean Section / Q000009:adverse effects; D005260:Female; D006801:Humans; D007044:Hysterectomy; D015994:Incidence; D011247:Pregnancy; D011256:Pregnancy Outcome; D014481:United States / Q000453:epidemiology; D014597:Uterine Rupture / Q000209:etiology* / Q000401:mortality / Q000601:surgery