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15 Cards in this Set
- Front
- Back
pulmonary vascular resistance is high or low in fetal circulation?
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high
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pressure is higher in which side of the heart in fetal circulation?
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right
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There are __ umbilical arteries and __umbilical viens
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2 arteries (non oxygenated)
1 vein (oxygenated) |
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the ductus arteriosus connects?
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the pulmonary artery to the aorta
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percentage of blood that shunts to the aorta from ductus arteriosus?
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90%
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ductus venosus connects?
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the umbilical vein (before the liver) to the IVC/right atrium
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PaO2 in the umbilical vein is__ but drops to __ when it hit the IVC?
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100mm Hg in umbilical and 30 mm Hg in the IVC
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foramen ovale shunts blood where?
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from the right atrium to the left atrium
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mechanical expansion at birth reults in?
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negative intrathoracic pressure. Inspiration is stimulated by being pushed through the birth canal (fluid is pushed out)
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list 3 instantaneous changes that occur during "birth asphyxia"
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decreased PaO2
increased PaCO2 decreased pH |
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the decrease in pH that occurs during birth stimulates what?
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the respiratory drive center in the hypothatlamus
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what happens to the PaO2 on the infants blood after birth?
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it increases due to vasodialtion of the pulmonary blood vessels
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as the pulmonary vascular resistance decreases in the newborn, what occurs?
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as PVR decreases, the blood flow to the lungs increases, especially to L atrium which increases the pressure on the left and slams the foramen ovale shut
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as the ductus arteriosus undergoes changes after birth, what occurs?
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*blood flow stops to aorta
*prostaglandins are inhibited which closes the DA |
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describe functional closure of the ductus arteriosus?
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the presure on the LEFT is higher
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