Nonuniformity of fetal umbilical systolic/diastolic ratios as determined with duplex Doppler sonography.

Journal Article (Journal Article)

Fetal umbilical arterial systolic/diastolic (S/D) ratios are said to be uniform throughout the umbilical cord. We evaluated this phenomenon by performing duplex Dopper on 73 fetuses at three sites in the umbilical cord: near the placental origin, in the free-floating midcord, and near the fetal abdominal wall insertion. Twenty-one of 73 fetuses examined (29%) demonstrated pronounced nonuniformity of the S/D ratios with a discrepancy of 1 or greater between any two S/D measurements. Studies demonstrated the highest S/D ratios at the fetal abdominal wall and lowest S/D ratios at the placental origin. These findings suggest that umbilical arterial flow velocity waveforms (FVWs) and S/D ratios are not uniform throughout the cord in all patients. The significance of this finding is uncertain; however, this variability in umbilical cord flow velocity waveforms stresses the importance of identifying the portion of the umbilical cord from which S/D ratios are obtained.

Full Text

Duke Authors

Cited Authors

  • Kay, HH; Carroll, BA; Bowie, JD; Killam, AP; Hertzberg, BS

Published Date

  • August 1, 1989

Published In

Volume / Issue

  • 8 / 8

Start / End Page

  • 417 - 420

PubMed ID

  • 2668551

International Standard Serial Number (ISSN)

  • 0278-4297

Digital Object Identifier (DOI)

  • 10.7863/jum.1989.8.8.417


  • eng

Conference Location

  • England