Pulmonary function tests Flashcards
1
Q
Pneumotachograph
A
measures air flow as a function of lung volume
2
Q
FEF 25-75
A
flow rate from 25% to 75% of vital capacity
+ more sensitive than FEV1
- very dependent on FVC
- large coefficient of variation
3
Q
FVC values
A
80-120% normal
70-79% mild reduction
50-69% moderate reduction
<50% severe
4
Q
FEV1
A
> 75% normal
60-75 mild obstruction
50-59 moderate
60 yo subtract 5
5
Q
FEF 25-75%
A
> 79% normal
<40% severe obstruction
6
Q
FEV1/FVC
A
> 80 normal
7
Q
Spirometry results for obstructive disorders
A
FVC nl or decreased FEV1 decreased FEV 25-75 decreased FEV1/FVC decreased TLC normal or increased
8
Q
Spirometry results for restrictive disorders
A
FVC decreased FEV1 low FEV 25-75 normal to low FEV1/FVC normal to high TLC low
