What category rules out fetal acidemia? - ANSWER Cat 1
What maternal conditions greatly impact fetal oxygenation? - ANSWER Severe astha,
cardiac issues, and ecclampic seizures
Where does the exchange of O2 and nutrients take place? - ANSWER intervillous
space
How is o2 blood transferred to the fetus? - ANSWER O2 enters the intervillous space
via the maternal arteries, to the villi then the umbilical vein take the o2 blood to the fetus.
The umbilical arteries take the deO2 blood from the baby through the villi and back to the
mother
Diffusion - ANSWER High to low concentration
Mom to fetus for O2
Low to high concentration for CO2 so baby to mom
How is O2 transferred from mom to baby - ANSWER Diffusion
Explain spiral arteries in placenta - ANSWER Carry O2 into intervillous space
Are maximally dilated so they can not be increased
1
, What are factors that can decrease uteroplacental blood flow? - ANSWER Maternal
conditions like pre-e and cardiac disease
Maternal hypotension
Placental changes- abruptions, infections, edema, or smaller size
Excessive uterine activity
Vasoconstriction
What happens to the spiral arteries during pre-e? - ANSWER They are constricted
which decreases blood flow
Why does the supine position cause decreased uteroplactenal blood flow? -
ANSWER The aorta and vena cava get compressed (20 weeks)
Why does maternal hypotension happen after regional analgesia? - ANSWER Blocks
the sympathetic pathway
Pooling of blood in the lower extremities decreases blood flow back to moms heart which
decreases blood flow to the fetus
What percentage is uteroplacental blood flow decreased by during cxts? -
ANSWER 60%
Explain the pathway for maternal- fetal exchange for fetal oxygenation (basic) -
ANSWER Environment to lungs to heart to vasculature to uterus to placenta to
umbilical cord
Where is the least O2 blood in the fetus? - ANSWER Limbs, kidneys, and descending
aorta
Where is the most O2 blood in the fetus? - ANSWER Umbilical vein and ductous
venous
2
What maternal conditions greatly impact fetal oxygenation? - ANSWER Severe astha,
cardiac issues, and ecclampic seizures
Where does the exchange of O2 and nutrients take place? - ANSWER intervillous
space
How is o2 blood transferred to the fetus? - ANSWER O2 enters the intervillous space
via the maternal arteries, to the villi then the umbilical vein take the o2 blood to the fetus.
The umbilical arteries take the deO2 blood from the baby through the villi and back to the
mother
Diffusion - ANSWER High to low concentration
Mom to fetus for O2
Low to high concentration for CO2 so baby to mom
How is O2 transferred from mom to baby - ANSWER Diffusion
Explain spiral arteries in placenta - ANSWER Carry O2 into intervillous space
Are maximally dilated so they can not be increased
1
, What are factors that can decrease uteroplacental blood flow? - ANSWER Maternal
conditions like pre-e and cardiac disease
Maternal hypotension
Placental changes- abruptions, infections, edema, or smaller size
Excessive uterine activity
Vasoconstriction
What happens to the spiral arteries during pre-e? - ANSWER They are constricted
which decreases blood flow
Why does the supine position cause decreased uteroplactenal blood flow? -
ANSWER The aorta and vena cava get compressed (20 weeks)
Why does maternal hypotension happen after regional analgesia? - ANSWER Blocks
the sympathetic pathway
Pooling of blood in the lower extremities decreases blood flow back to moms heart which
decreases blood flow to the fetus
What percentage is uteroplacental blood flow decreased by during cxts? -
ANSWER 60%
Explain the pathway for maternal- fetal exchange for fetal oxygenation (basic) -
ANSWER Environment to lungs to heart to vasculature to uterus to placenta to
umbilical cord
Where is the least O2 blood in the fetus? - ANSWER Limbs, kidneys, and descending
aorta
Where is the most O2 blood in the fetus? - ANSWER Umbilical vein and ductous
venous
2
