title: Perinatal outcomes in singleton pregnancies with a single umbilical artery.
abstract: OBJECTIVE
  To analyze perinatal outcomes in singleton pregnancies with a single umbilical artery (SUA) as an isolated finding with no other underlying disorders.
  
  
  METHODS
  This retrospective observational study compared a group of pregnancies with SUA (n = 127) and a group with a normal 3-vessel umbilical cord (n = 27 752). The study variables comprised maternal and obstetric characteristics and perinatal outcomes.
  
  
  RESULTS
  The frequency of SUA was 0.45%. Pregnancies with SUA ended more frequently with cesarean delivery, and had a higher risk that the indication for cesarean delivery was non-reassuring fetal heart rate (NRFHR). Neonates in the SUA group had a lower weight for gestational age, and a higher risk of low umbilical cord blood pH.
  
  
  CONCLUSIONS
  Obstetricians should monitor fetal growth closely in pregnancies with SUA, and be alert to NRFHR during labor and delivery.
authors.affiliation: a Department of Gynecology and Obstetrics , Virgen de las Nieves University Hospital , Granada , Spain.
authors.forename: Mariña
authors.initials: M
authors.lastname: Naveiro-Fuentes
authors.affiliation: a Department of Gynecology and Obstetrics , Virgen de las Nieves University Hospital , Granada , Spain.
authors.forename: María Paz
authors.initials: MP
authors.lastname: Carrillo-Badillo
authors.affiliation: a Department of Gynecology and Obstetrics , Virgen de las Nieves University Hospital , Granada , Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Malde-Conde
authors.affiliation: a Department of Gynecology and Obstetrics , Virgen de las Nieves University Hospital , Granada , Spain.
authors.forename: Jose Luis
authors.initials: JL
authors.lastname: Gallo-Vallejo
authors.affiliation: a Department of Gynecology and Obstetrics , Virgen de las Nieves University Hospital , Granada , Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Puertas-Prieto
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D012189:Retrospective Studies; D058529:Single Umbilical Artery / Q000453:epidemiology*; D013030:Spain / Q000453:epidemiology
keywords: Perinatal outcomes; single umbilical artery; singleton pregnancy; umbilical cord