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13 Cards in this Set
- Front
- Back
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What is the O2 saturation of blood in the umbilical vein?
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80%
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What are the 3 important shunts in fetal circulation?
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1. Foramen ovale
2. Ductus arteriosus 3. Ductus venosus |
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Where does most of the blood that passes through foramen ovale come from?
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IVC
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Why does blood pass thru foramen ovale?
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To bypass the lung circulation, it's not working at that time anyway.
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What happens to the blood from IVC that passes thru foramen ovale?
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It is pumped out the aorta and goes to the head.
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Where does most blood that passes thru Ductus arteriosus come from?
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SVC
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Why does blood from the SVC go thru the ductus arteriosus?
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Because after going in the right atrium and right ventricle, then it gets pumped into the pulmonary trunk; but it doesn't need to go to the lungs, so it goes from the pulmonary trunk right into the aorta.
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Where does the blood that passes from the ductus arteriosus into the aorta go?
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To the lower body
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Why does IVC blood go to the head and SVC blood goes to the lower body?
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Not really sure.
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What happens to fetal circulation at birth when the baby takes a breath?
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1. Pulmonary vascular resistance becomes much less
2. Now blood pumps into the pulmonary circulation, so left atrial pressure rises a lot and shuts foramen ovale |
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What does the increase in oxygen in pulmonary and cardiovascular cirulation do?
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Decreases the concentration of circulating prostaglandins, failing to keep open the ductus arteriosus - so it shuts.
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What molecule will keep the ductus arteriosus OPEN?
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Prostaglandin
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What molecule will SHUT the ductus arteriosus?
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Indomethacin
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