Pulmonary adaptations Flashcards
1
Q
What happens to the diaphragm as pregnancy progresses?
A
Elevates dues to uterine enlargement
2
Q
How much can the diaphragm by elevated by?
A
4cm
3
Q
How much % is the reserve volume reduced by?
A
25%
4
Q
Why is the filling effectiveness reduced?
A
Because the rib cage flairs outwards
5
Q
Why is the work of breathing increased?
A
Due to diaphragm resistance
6
Q
What 2 components of breathing are reduced as pregnancy progresses?
A
Reserve volume and residual volume
7
Q
Why is there a resting hyperventilation during pregnancy?
A
Increased plasma progesterone which makes brain more sensitive to CO2.
8
Q
What three things does hyperventilation cause?
A
Resting hypocapnia = decreased PCO2, maternal alkalosis and increased PO2.
