Physiology

Question 1

At which stage in pregnancy do lung volumes change?

Answer 1

3rd month

Question 2

By how many cm does uterine enlargement displace the diaphragm by?

Answer 2

4cm

Question 3

Functional residual capacity changes by how much and in which direction?

Answer 3

Reduced by 20%

Question 4

Total lung capacity
changes by how much and in which direction?

Answer 4

Reduced by 5%

Question 5

Expiratory reserve volume changes by how much and in which direction?

Answer 5

Reduced by 20%

Question 6

Tidal volume changes by how much and in which direction?

Answer 6

Increases by 50%

Question 7

Minute ventilation changes by how much and in which direction?

Answer 7

Increases by 50% in 1st trimester

Question 8

FEV1/FVC changes by how much and in which direction?

Answer 8

Unchanged

Question 9

Oxygen consumption changes by how much and in which direction?

Answer 9

Increases by 20%

Question 10

pco2 and po2 changes by how much and in which direction?

Answer 10

PCO2 decreases
PO2 increases

Question 11

pH changes by how much and in which direction?

Answer 11

Ph remains normal or increases slightly (renal compensation: HCO3 decreases)

Question 12

Blood volume changes by how much and in which direction?

Answer 12

Slowly increases by 40-50%

Question 13

HR changes by how much and in which direction?

Answer 13

Increases by 15 beats per minute above baseline

Question 14

stroke volume changes by how much and in which direction?

Answer 14

Increases by 25-30%

Question 15

Cardiac output changes by how much and in which direction?

Answer 15

Increases by 30-50%

Question 16

Systemic vascular resistance changes by how much and in which direction?

Answer 16

reduces by 20-30%

Question 17

Diastolic BP changes by how much and in which direction?

Answer 17

Decreases between 12-26 weeks but increases to pre-pregnancy levels by 36 weeks

Question 18

What compound forms the major constituent of surfactant?

Answer 18

Dipalmyltoilphosphatidylcholine