1
Q
Six causes of hypoxaemia
A
Reduced PiO2 Hypoventilation V/Q mismatch Diffusion limitation Shunting Reduced mixed venous oxygenation
2
Q
3 Mechanisms for compensating for gas hypoxaemia
A
Increase O2 extraction
Increase CO
Increase ventilation
3
Q
4 causes of diffusion limitation
A
Alveolar-capillary block (diffuse lung disease)
Loss of diffusing surface (emphysema)
Capillary volume (pulmonary hypertension)
Hb (anaemia)
4
Q
How can a diffusion limitation be measured
A
Using the DLCO (diffusing capacity lung CO).
