Flashcards in Lung Function Tests Deck (24)
What is spirometry?
Test used to asses lung function
What is tidal volume?
Normal volume moved by a normal breath
What is the inspiratory reserve volume?
Air that can still be breathed after normal breath
What is the expiratory reserve volume?
The extra air that can be exhaled after a normal breath
What is the residual volume?
Air that always remains in lungs
Why is there a residual volume?
Prevent alveolar collapse
What is inspiratory capacity?
Tidal volume + Inspiratory reserve volume
What is functional residual capacity?
Expiratory reserve volume + residual volume
What is vital capacity?
The maximum amount of air moved by lungs
What is the total lung capacity?
Vital capacity + residual volume
What can be calculated from spirometry?
What is FEV1?
Forced expiratory volume
Forced expiration in 1st second
What is FVC?
Forced vital capacity
Total volume that can be forcibly exhaled in one breath
What is FEV1/FVC?
Compared to normal for height, age, sex
What is normal FEV1?
What is normal FVC?
What is normal FEV1/FVC?
What patient details do you need when taking spirometry>
What is the obstructive pattern on spirometry?
Reduced FVC to a lesser extent
What causes an obstructive pattern?
How is COPD graded?
Mild (stage 1) >80%
Moderate (stage 2) 50-79%
Severe (stage 3) 30-49%
Very severe (stage 4) <30%
How do you test reversibility?
- no SABA for 6 hours
- no LABA for 12 hours
400mg then repeat after 15 mins
What is the restrictive pattern on spirometry?