Lung Physiology 3

Question 1

% predicted

Answer 1

(FEV Measured/ FEV Predicted) x 100

(FVC Measured/ FVC Predicted) x 100

Ratio of measured or predicted: FEV/FVC

When the ratio between the FVC and FEV is low, suggests there is airway obstruction.
Typical of asthma

In this case the flow volume curve is typically scalloped- there is mid expiratory flow reduction. This is because its the little airways that are blocking with asthma
There’s a typical reduction in the flow when there is a out past the FEV

Question 2

Asthma- typical blood gases

Answer 2

PaO2 Normal

PaCO2 Low as people start to over ventilate

PH Normal or elevated

HCO3- Normal

Question 3

Transfer estimate

Answer 3

the ability to transfer carbon monoxide across the alveolar membrane into the blood

Question 4

When there is a high ratio of FEV to FVC:

Answer 4

There is not airway obstruction

Instead this means the individual is restricted- has small restricted lungs