title: Prenatal sonographic diagnosis of single umbilical artery.
abstract: OBJECTIVE
  We evaluated the reliability of prenatal sonography and the usefulness of the umbilical vein and artery diameter ratio, transverse umbilical artery diameter, and systolic-diastolic ratio in detecting single umbilical artery (SUA).
  
  
  METHODS
  In 24 of 6,970 fetuses, SUA was detected using prenatal sonography and confirmed at birth. These cases were retrospectively reviewed.
  
  
  RESULTS
  Four fetuses had major malformations, and 1 had a minor anomaly. Thirteen fetuses with SUA underwent chromosomal analysis, and only 2 had abnormal karyotypes. Most of the SUA fetuses had a normal systolic-diastolic ratio.
  
  
  CONCLUSIONS
  Our retrospective study determined that the prognosis of SUA fetuses is good when there is no concurrent anatomic or chromosomal abnormality. Although some reports claim that the transverse umbilical artery diameter or the ratio between umbilical vein and artery diameters can predict SUA, we found no significant improvement in the recognition of SUA using these parameters.
authors.affiliation: Department of Obstetrics and Gynecology, National Cheng-Kung University Hospital, Tainan, Taiwan, Republic of China.
authors.forename: M H
authors.initials: MH
authors.lastname: Wu
authors.forename: F M
authors.initials: FM
authors.lastname: Chang
authors.forename: M R
authors.initials: MR
authors.lastname: Shen
authors.forename: B L
authors.initials: BL
authors.lastname: Yao
authors.forename: C H
authors.initials: CH
authors.lastname: Chang
authors.forename: C H
authors.initials: CH
authors.lastname: Yu
authors.forename: C C
authors.initials: CC
authors.lastname: Hsu
authors.forename: K E
authors.initials: KE
authors.lastname: Huang
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D015203:Reproducibility of Results; D012189:Retrospective Studies; D018615:Ultrasonography, Doppler, Color; D016216:Ultrasonography, Prenatal; D014469:Umbilical Arteries / Q000002:abnormalities* / Q000000981:diagnostic imaging* / Q000503:physiopathology