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15 Cards in this Set

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