Umbilical artery waveform analysis based on maximum, mean and mode velocity in early human pregnancy
✍ Scribed by Nicolette T.C. Ursem; Hans J.F. Brinkman; Piet C. Struijk; Wim C.J. Hop; Mark H. Kempski; Bradley B. Keller; Juriy W. Wladimiroff
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 664 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0301-5629
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✦ Synopsis
The objective of this study was to identify the best method for reconstructing blood-flow velocities from the early human umbilical artery to determine the physiological changes in fetal blood-flow velocity and heart rate. Pulsed Doppler recordings from the umbilical artery with a duration of approximately 7 s were made at 10-20 weeks of gestation. For reconstruction of the blood-flow velocity from the Doppler audio signal, the maximum (envelope), mean and mode frequency reconstruction methods were used. For the assessment of variability in blood-flow velocity and heart rate in the umbilical artery, the maximum velocity reconstruction method is preferred because it is relatively insensitive to noise, nonuniform insonation, and wall filter settings.