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Fetal venous circulation--an update on hemodynamics.
J Perinat Med
October 2000
Department of Obstetrics and Gynecology, Bergen University Hospital, Norway.
The refinements of modern ultrasound techniques permit a renewed examination of old concepts of fetal circulation. The concept of preferential streaming of umbilical blood through the foramen ovale is verified by animal experiments, and ultrasound studies have confirmed that a similar mechanism operates in human fetuses. However, the normalized umbilical flow appears to be less in the human than in fetal sheep, and decreases with advancing gestational age (115 ml min-1 kg-1 at 20 and 64 mL min-1 kg-1 at 40 weeks).
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