Lung Volume Measurement and Disease Flashcards
What is total lung capacity and what is a typical value?
total amount of air in the lung on maximal inspiration (7L)
What is residual volume and what is a typical value?
volume of lung after maximal expiration (2L)
What is vital capacity?
total lung capacity - residual volume
what is functional residual capacity?
minimum value of the lung during quiet breathing
What is tidal volume?
difference between the minimum and maximum volume of the lung during quiet breathing
What is FEV1?
amount of air expired after 1 second of forceful expiration
what is functional vital capacity (FVC)?
total amount of air forcefully expired
what does FEV1/FVC represent? What is a normal value?
the rate of airflow during expiration
0.8
In pulmonary fibrosis what would you expect in RV, FRC, TLC, VC, and FEV1/FVC?
- RV down
- FRC down
- TLC way down
- VC way down
FEV1/FVC no change or small increase
In bronchitis, what would you expect in RV, FRC, TLC, VC, and FEV1/FVC?
- RV increase
- FRC increase
- TLC no change
- VC decrease
- FEV1/FVC way down
what is the physiological explanation for a decrease in RV and FRC in pulmonary fibrosis?
lung is closer to the intrinsic equilibrium
what is the physiological explanation for RV and FRC increase in bronchitis?
because obstructive diseases breathe at higher lung volumes
