Advanced Fetal Monitoring (Answered 100% Correctly) 2024-2025
Cat 1
What category rules out fetal acidemia?
Severe astha, cardiac issues, and ecclampic seizures
What maternal conditions greatly impact fetal oxygenation?
intervillous space
Where does the exchange of O2 and nutrients take place?
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
How is o2 blood transferred to the fetus?
High to low concentration
Mom to fetus for O2
Low to high concentration for CO2 so baby to mom
Diffusion
Diffusion
How is O2 transferred from mom to baby
Carry O2 into intervillous space
Are maximally dilated so they can not be increased
Explain spiral arteries in placenta
Maternal conditions like pre-e and cardiac disease
Maternal hypotension
Placental changes- abruptions, infections, edema, or smaller size
Excessive uterine activity
Vasoconstriction
What are factors that can decrease uteroplacental blood flow?
They are constricted which decreases blood flow
What happens to the spiral arteries during pre-e?
The aorta and vena cava get compressed (20 weeks)
Why does the supine position cause decreased uteroplactenal blood flow?
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
Why does maternal hypotension happen after regional analgesia?
60%
What percentage is uteroplacental blood flow decreased by during cxts?
Environment to lungs to heart to vasculature to uterus to placenta to umbilical cord
Explain the pathway for maternal- fetal exchange for fetal oxygenation (basic)
Limbs, kidneys, and descending aorta
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