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