Comparison of velocity waveforms of the umbilical artery obtained by pulsed and computerized continuous wave Doppler in third trimester, uncomplicated pregnancies

A. J. Jaffa*, I. Wolman, A. Ben-Shlomo, J. Sagi, J. Har-Toov, M. R. Peyser

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To assess the difference between pulsed-wave Doppler (PD) and computerized continuous-wave Doppler (CW) readings of the umbilical artery of 20 parturients in their third trimester of uncomplicated pregnancy. Methods: In a prospective double-blind study, the systolic/diastolic ratio in the umbilical artery was measured 20 min apart by two different physicians with two different instruments (PD and CW). The resistance index (RI), as well as the intra- and interobserver variation were calculated. Results: Interobserver variation was not significant for both techniques (P > 0.05). The mean S/D ratio measured by PD (2.92 ± 0.52) was significantly higher than that measured by CW. The mean RI in the PD readings was also significantly higher than that measured by CW (0.64 ± 0.07 vs 0.61 ± 0.06). The intraobserver variation was much smaller for CW readings of the S/D ratio than for the PD readings. Conclusions: The more accurate computerized readings of the CW appear to be the reason for the difference in measurements.

Original languageEnglish
Pages (from-to)107-109
Number of pages3
JournalJournal of Maternal-Fetal Investigation
Volume4
Issue number2
StatePublished - 1994
Externally publishedYes

Keywords

  • Computerized continuous-wave Doppler
  • Pulsed-wave Doppler
  • Third trimester
  • Umbilical artery

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