Pregnancy 2 Flashcards
After how many days foes the blastocyst attach to the uterus?
5-8 days
After how many days is the blastocyst completely buried in uterine lining?
12 days
What do trophoblastic cells differentiate in to?
Syncytiotrophoblasts
What is the function of syncytiotrophoblasts?
Break down capillaries to form cavities full of maternal blood
By what gestation is the placenta and fetal heart functional?
Week 5
What is the function of HCG?
Signals to the corpus luteum to continue producing progesterone
What are the 3 features of fetal Hb?
Increased ability to carry O2
Higher concentration than in adults
Can carry more O2 in low CO2
Function of human chorionic somatomammotropin?
Growth hormone effects
Decreased insulin sensitivity in mothers
Function of oestrogen in pregnancy?
Enlargement of uterus
Breast development
Relaxation of ligaments
What happens to CO in pregnancy?
Increases by 30-50% in weeks 6 - 24
Decreases in last 8 weeks
What happens to heart rate in pregnancy?
Increases by up to 90BPM
What happens to plasma volume in pregnancy?
Increases by 50% - proportionally with cardiac output
What happens to erythropoiesis in pregnancy?
Increases by 25%
What happens to Hb in pregnancy?
Decreases - by dilution
What happens to iron requirement during pregnancy?
Increases significantly
Why does lung function change in pregnancy?
Due to progesterone
And due to enlarging uterus
What happens to CO2 levels?
Decreases
What happens to respiratory rate in pregnancy?
Increases
What happens to tidal and minute volume in pregnancy?
Increases by 50%
What happens to vital capacity in pregnancy?
Nothing
What happens to pO2 in pregnancy?
Nothing
What happens to GFR in pregnancy?
Increases by 30-50%
What happens to urine formation in pregnancy?
Slight increase
What is the average maternal weight gain in pregnancy?
24lbs
