Pulmonary Function Test Flashcards
TLC
Total Lung Capacity (maximal inspiration)
VC
Vital Capacity (maximal amount of air that can be expired after maximal inspiration)
Volume of air in lungs at maximal inspiration
Total Lung Capacity (TLC)
the maximal amount of air that can be expired after a maximal inspiration
Vital capacity (VC)
FVC
Forced Vital Capacity
Type of lung disease in which ventilation is disturbed by a limitation in chest expansion. Inspiration is primarily affected
Restrictive (Volumetric problem)
Type of lung disease in which ventilation is disturbed by an increase in airway resistance. Expiration is primarily affected
Obstructive (air flow problem)
The amount of air that can be forcefully expelled from a maximally inflated lung position.
FVC (forced vital capacity)
Forced expiratory volume in 1 second, the volume of air expelled during the first second of the FVC
FEV1
The percentage of the FVC expired in one second
FEV1/FVC
What % or normal will an obstructive lung condition have on an FEV1/FVC?
Considerable less than 80%
What % or normal will a restrictive lung condition have on an FEV1/FVC?
80% or greater of normal
What pattern will we see on FEV1 test for patients with obstructive and restrictive lung conditions?
Lowered FEV1 (obstructive=can’t push air out quickly, restrictive=amount of air originally inhaled is low)
diffusing capacity of the lung for carbon monoxide, quantitative measurement of gas transfer in the lungs.
DLCO
What types of diseases will cause a decreased DLCO (diffusion capacity for CO)?
Those that damage alveoli or decrease blood flow to lungs
