Blood flow through the ductus venosus in human fetus: calculation using Doppler velocimetry and computational findings

Ultrasound in Medicine & Biology
G PennatiR Fumero

Abstract

The present study was performed to assess a new method to calculate the blood flow rate through the ductus venosus (DV) in normal human fetuses using available echo-Doppler data. Color Doppler sonographic unit was used to study DV flow in 26 normal fetuses between 20 and 36 wk of gestation. Maximal velocity flow tracings and vessel diameters were obtained at the isthmic and the outlet portion of the DV. Time-averaged velocities in the DV were measured from the recorded tracings. The velocity distribution in the two investigated cross-sectional areas of the DV was evaluated by means of computational model simulations and the velocity shape coefficients h(in) and h(out), (i.e., the ratios between the maximal and mean spatial velocities) were calculated as a function of vessel geometry. These values allowed us to convert maximal Doppler velocities into mean spatial velocities for each fetus. Blood flow rate was evaluated both at the isthmus and at the outlet of the vessel by means of two formulae based on the ultrasonographic measures and the results of the computational model. The value of the DV blood flow rate was calculated as the average between the results provided by the two formulae. The velocity distributions both at the ...Continue Reading

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Citations

Jan 2, 2013·Biomechanics and Modeling in Mechanobiology·Paul R LeinanLeif R Hellevik
Jul 31, 1999·European Journal of Obstetrics, Gynecology, and Reproductive Biology·T Kiserud
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