Fetal Dev And Transition (intra to extra) Flashcards
2 circuits of fetal circulation
Heart- First and major
lungs- minor
Draw the fetal blood circulation
—-
Normal pO2 of the fetus
55mmHg
What causes closure of the foramen ovale
Closure of PDA
When is it anatomically closed?
Increased pressure of LA
Increased O2 in the blood
1-2 weeks of life
When and what produces surfactant
Type II pneumocytes of alveolar cells
Beginning 25 weeks of gestation until full term gest
What are the parameters to measure during ultrasound
Biparietal diameter
Head circum
Femoral length
Abdominal circumf
If only a single ultrasound can be pbtained, it should be done when?
18-20 weeks of gestation
What is the estimated fetal wight less than the 10th percentile
Types
FGR
Fetal growth restriction
Symmetric-early, brain dev isbaltered
Assymmetric- late
How is the fetal maturity and dating assessed?
Most accurate?
When is ultrasound accurate?
280days after LMP = expected date of confinement
Assisted reproductice technology ART
When done during the first trimester
Most predominant cause of antepartum fetal distress
Uteroplacental insufficiency
When is AFP reduced?
Trisomies (down), aneuploidy
Non stress test
Reactive vs nonreactive
Reactive (normal)- 2FHR accelerates atleast 15bpm from baseline lasting 15secs during 20min of monitoring
Fetal compromise
What parameters are checked in biophysical scoring
Fetal breathing movements FHR Gross body movements Fetal tone Amniotic fluid volume
What are the causes of deceleration
Early
Late
Variable
Head compression
Fetal hypoxemia, Uteroplacental insufficiency (compression of vessels)
umbilical cord compression)
Three tier FHR interpretation system
1-normal fhr, no decelerations, present or absent acceleration, fhr variability is moderate
2
3- absence of fhr variabilit, with decelerations, bradycardia, sinusoidal pattern
