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4 Cards in this Set

  • Front
  • Back
Describe the Doppler technique
Scattering of moving red blood cells causes a frequency shift between the transmitted wave and the observed wave. Reflects blood flow velocity.
Fetal circulation has three specific adaptations:
1. ductus venosus
2. foramen ovale
3. ductus arteriosus
Proportion of fetal cardiac output directed to the placenta:
1/3 in second trimester up to 1/5 from 32 weeks onwards
Proportion of umbilical venous blood directed to the liver under physiological conditions
is 2/3, regulated by the ductus venosus.