Physiology of Pregnancy Flashcards Preview

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Flashcards in Physiology of Pregnancy Deck (38)
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1

After fertilisation, the cells of the pre-embryo divide and differentiate into what as it travels down the fallopian tube to the uterus?

Blastocyst

2

What does the blastocyst become known as once it implants in the endometrium?

Embryo

3

The outer membranes of the blastocyst develop to form what?

The amniotic sac and placenta

4

After fertilisation, when does implantation usually occur?

Between days 6-10

5

An embryo becomes a foetus after how long?

8 weeks

6

What period of time is defined as the first trimester of pregnancy?

Conception to week 12

7

What period of time is defined as the second trimester of pregnancy?

Weeks 13 to 27

8

What period of time is defined as the third trimester of pregnancy?

Week 28 to delivery

9

What structure provides nutrients for the growing embryo until the placenta is established?

Yolk sac

10

What is a normal volume of amniotic fluid by late pregnancy?

900-1000mls

11

The placenta (and the foetal heart) is generally functional by when?

Week 5

12

Is there ever any direct contact between the foetal and maternal blood in pregnancy?

No

13

What hormone is responsible for preventing the regression of the corpus luteum in early pregnancy?

Beta HCG

14

What hormone is responsible for ensuring the endometrium is not shed in early pregnancy?

Progesterone

15

What hormones are secreted by the placenta?

Oestrogen and progesterone

16

What happens to the diastolic blood pressure in pregnancy?

Drops in the first two trimesters, returns to pre-pregnancy level in the third trimester

17

What happens to peripheral vascular resistance in pregnancy?

Decreased

18

What happens to the cardiac output in pregnancy?

Increases up to 24 weeks, decreases in the last 8 weeks, increases again in labour

19

If pregnancy causes the cardiac output to rise, this means that what other two variables must also rise?

Heart rate and stroke volume

20

What happens to the plasma volume in pregnancy?

Increases by 50%

21

What happens to erythropoiesis in pregnancy?

Increases by 25%

22

What happens to haemoglobin concentration in pregnancy?

Decreases (up to 20% would be considered normal)

23

What effect does pregnancy have on coagulation?

Produces a hyper-coagulable state

24

What happens to the platelet count in pregnancy?

Decreases

25

What happens to the WCC and ESR in pregnancy?

Increase

26

What hormone is most responsible for the changes in the respiratory system that are seen during pregnancy?

Progesterone

27

What happens to the respiratory rate in pregnancy?

Increased

28

What happens to the tidal and minute volume in pregnancy?

Increased

29

What happens to the pCO2 in pregnancy?

Decreased

30

What happens to the vital capacity in pregnancy?

No change