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References ranges and sources of variation for indices of pulsed Doppler flow velocity waveforms from the uteroplacental and fetal circulation
Article first published online: 19 AUG 2005
DOI: 10.1111/j.1471-0528.1988.tb06865.x
Issue
1471-0528/asset/cover.gif?v=1&s=b4e1d96c46e18c61210d584b63c13ee375cf562b "BJOG: An International Journal of Obstetrics & Gynaecology")
BJOG: An International Journal of Obstetrics & Gynaecology
Volume 95, Issue 3, pages 248–256, March 1988
Additional Information
How to Cite
PEARCE, J. M., CAMPBELL, S., COHEN-OVERBEEK, T., HACKETT, G., HERNANDEZ, J. and ROYSTON, J. P. (1988), References ranges and sources of variation for indices of pulsed Doppler flow velocity waveforms from the uteroplacental and fetal circulation. BJOG: An International Journal of Obstetrics & Gynaecology, 95: 248–256. doi: 10.1111/j.1471-0528.1988.tb06865.x
Publication History
- Issue published online: 19 AUG 2005
- Article first published online: 19 AUG 2005
- Received 1 June 1987 Accepted 20 August 1987
- Abstract
- References
- Cited By
Summary. Variation in indices used to characterize the maximum frequency outline of waveforms obtained from the uteroplacental and fetal circulations by duplex Doppler ultrasound was studied between observers, over a 24-h period and before and after a meal. No significant differences were found. Reference ranges were derived for three indices, the A/B ratio, the resistance index and the pulsatility index, for waveforms from the fetal descending aorta, umbilical artery, and the placental and maternal sides of the uteroplacental circulation. Indices from waveforms from the uteroplacental circulation demonstrated a fall from 16 to 24 weeks gestation with no change thereafter. The umbilical artery indices demonstrated a continuing fall with increasing gestation but the A/B ratio and resistance index from the fetal descending aorta did not change with gestation. The pulsatility index from the aorta demonstrated a gentle rise.