Pulmonary Function Test Flashcards
How do you conduct a CO diffusion test?
What are the 3 categories of lung diseases we should be familiar with?
What values on spirometry would be altered in a person with obstructive airway disease?
Increased RV and TLC
Decreased FEV1/FRC ratio
What are all the labels on this diagram?
1) Total lung capacity (TLC)
2) Functional residual capacity (FRC)
3) Expiratory reserve volume (ERV)
4) Inspiratory reserve volume (IRV)
5) Forced vital capacity (FVC)
6) Residual volume (RV)
7) Inspiratory capacity (IC)
8) Tidal volume (Vt)
9) Vital capacity (VC)
Why is the inhalation flow negative in this graph?
The spirometer measures air taken away from the device as negative (sucking air in during inhalation) and flow that is given back to the device as positive (blowing air out during expiration)
Forced Vital capacity = […] + […]
IRV + ERV
Where is the FEV1 and FVC on this graph?
What is the peak expiratory flow rate?
Rate of change of volume / rate of change of time
What is FEV1?
What is FVC?
- FEV1 is forced expiratory volume, or the VOLUME of air that a person can force out of their lungs during 1 second
- FVC is forced vital capacity, or the total amount of air that the person can force out of their lungs
What causes an increased diffusion capacity result for CO test?
What is coving?
What does this spirometry report tell you?
Decreased FVC
Decreased FEV1
Decreased FEV1/FVC –> COPD
Increased TLC –> COPD
Increased RV –> COPD
What values on spirometry would you expect if a person has restrictive airway disease?
All volumes of air decreased
FEV1/FVC is normal to increased
Why would you order a PFT?
- Diagnose symptomatic disease (dyspnea, cough, hypoxemia that is unexplained)
- Screen for early asymptomatic disease
- Prognosis of known disease
- Monitor response to treatment