Fetal venous circulation - an update on hemodynamics
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Torvid Kiserud
Abstract
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). Compared to the 50% shunting of umbilical blood through the ductus venosus found in animal experiments, the degree of shunting in the human fetus under physiological conditions is considerably less, 30% at 20 weeks, which decreases to 18% at 32 weeks, suggesting a higher priority of the fetal liver than previously realized.
Augmented pulsatility in the precordial veins, ductus venosus, and umbilical vein is an important clinical sign that is poorly understood. Recent fluid dynamic studies show that, apart from the pressure generated in the atria, it is the stiffness of the vessel wall, compliance, and notably, impedance which modify these waves. Particularly the substantial shift in impedance at the ductus venosus-umbilical vein junction causes wave reflection and reduced transmission of waves, the result being diminished or absent pulsation in the umbilical vein.
Copyright (c)2000 by Walter de Gruyter GmbH & Co. KG
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Artikel in diesem Heft
- Fetal venous circulation - an update on hemodynamics
- Soluble intercellular adhesion molecule and C-reactive protein as early markers of infection in newborns
- Risk factors for intraventricular hemorrhage in a birth cohort of 3721 premature infants
- Choice of cesarean section and perception of legal pressure
- Detection of C-type natriuretic peptide in fetal circulation
- Evaluation of a strategy to limit blood donor exposure in high risk premature newborns based on clinical estimation of transfusion need
- The significance of interleukin-6 concentrations in cervicovaginal fluid: its relation to umbilical cord plasma and the influence of antibiotic treatment
- Maternal serum interleukin 6 levels in preterm labor: prediction of admission-to-delivery interval
- Extracellular matrix components of the wall of umbilical cord vein and their alterations in pre-eclampsia
- Legionnaires disease complicating pregnancy: a case report with intrauterine fetal demise
- Intrauterine MRI with single-shot fast-spin echo imaging showed different signal intensities in hypoplastic lungs
- Congenital lobar emphysema occurring in twins
- Fetal intrathoracic injuries following mild maternal motor vehicle accident
