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.
- Kay, HH; Carroll, BA; Bowie, JD; Killam, AP; Hertzberg, BS
- August 1, 1989
Volume / Issue
- 8 / 8
Start / End Page
- 417 - 420
International Standard Serial Number (ISSN)
Digital Object Identifier (DOI)