Fetal Circulation Flashcards
Oxygenation occurs in the ____ during fetal circulation
Placenta
O2 blood returns from the placenta to which vein during fetal circulation?
Umbilical vein and IVC (sinus venosus)
There are two shunts in fetal circulation. Which are they?
PFO and PDA
A PFO and a PDA are both shunts that move in which direction during fetal circulation
R-L
This shunt has flow from the IVC enter the right atrium and crosses into the left atrium via the eustachian valve, which shunt is this during fetal circulation?
PFO
This shunt has flow from the pulmonic artery, go into the aorta which shunt is this?
PDA
Why does a majority of flow cross the ductus arteriosus rather than go through the pulmonic artery during fetal circulation?
Because the ductus arteriosus has less resistance than the pulmonic artery
In normal fetal development, which shunt is the last to close?
PFO
In normal fetal circulation, which shunt is the first to close
PDA
Where is the location of the aortic isthumus?
The area between the left subclavian and the ductus arteriosus
What is the ligamentum arteriosum?
A remnant of the ductus arteriosus blood vessel in fetal development
With a interrupted aorta, where does the descending aorta then receive its blood from?
From the PDA
Once the baby is born, the lungs ___ and the ______ artery resistance should drop. This allows blood to fully cross the ____ artery rather than continuing through the _____
Inflate; pulmonic artery; pulmonic artery; PDA
After birth, how long does it take for the ductus arteriosus to close?
2-3 days
After birth, what causes the the PFO closing?
After birth, right atrial pressure decreases and left atrial pressure increases this left atrial pressure increase closes the PFO
