Flashcards in Pulmonary Function Tests Deck (15)
Is maximal effort flow greater at a greater lung volume or lower lung volume?
-greater lung volume
-airways are distended, resistance to flow is less
What is responsible for the plateau on the IVPF curves?
Is peak flow effort dependent or effort independent? (can it vary based on the patient's effort)
Peak flow is effort dependent
- If a patient doesn't blow as much air as they can, their peak flow won't measure as high as it truly is
Is Mid-expiratory flow effort dependent or effort independent?
Independent of effort
In a volume vs Pressure plot, what is the slope?
In a pressure vs flow plot what is the slope?
What are you trying to measure in a flow vs volume plot?
maximal effort flow volume
In a flow volume loop, what is the distance across the x-axis of the loop called?
In a MEFV loop, what would be indicated if the exipiratory curve is concave downwards?
-due to elevated compliance at low mid-expiratory flows
A normal person should expire what percent of their vital capacity in one second? What is the shorthand for this measurement?
In a MEFV loop, what would a decreased vital capacity indicate?
A restrictive disease
A pediatric patient would have a decreased what in compared to adult patient?
A smaller vital capacity
In a patient with respiratory muscle disease, how would MEFV be changed?
-vital capacity is normal
-peak flow is depressed
What is occurring to each of these values in an obstructive disease such as asthma?
1. FEV1 - decreases (alot)
2. FVC - decreases
3. FEV1/FVC - decreases
4. FRC - increases (can't expire all the air)