Hypoxaemia Flashcards
1
Q
What is normal PaO2?
A
10.5-13.5kPa
2
Q
What is normal PaCO2?
A
4.8-6kPa
3
Q
What is Type 1 resp. failure?
A
PaO2<8kPa
4
Q
What is Type 2 resp. failure?
A
PaCO2>6.5kPa
5
Q
What are the 4 abnormal states causing hypoxaemia?
A
V/Q mismatch
Shunt
Alveolar hypoventilation
Diffusion impairment
6
Q
What is V/Q mismatch?
A
Low ventilation compared to perfusion due to alveolar hypoventilation
Responds well to increased FiO2
7
Q
What is shunt?
A
Passage of blood from right side of heart to left without participation in gas exchange
8
Q
What is alveolar hypoventilation?
A
Not enough air to alveoli
- Upper airway obstruction
- Chest wall damage
- Muscle paralysis
- Peripheral nerve damage
9
Q
What is diffusion impairment?
A
Dysfunction in oxygen transport between alveoli and capillaries
