what is a PFT?
Pulmonary Function test that uses a spirometer to measure tidal volume
what is a spirometer most useful for?
can distinguish between obstructive pulmonary diseases and restrictive airway diseases
obstructive pulmonary diseases
increased airway resistance
restrictive airway diseases
total reduced lung capacity
TLC
total lung capacity
the maximum amount of air in lungs after a maximum inspiratory effort
FRC
functional residual capacity
volume of air remaining in lungs after a normal tidal volume expiration
RV
residual volume
amount of air remaining in lungs after after a forced expiration
VC
Vital Capacity
Maximum amount of air that can be expired after a maximum inspiratory effort
In obstructive diseases
Total lung capacity _________ because ______ ____________
increases
lungs hyperinflate
In restrictive diseases
Total lung capacity _________ because ____ ________ __ ________
decreases
lung expansion is limited
In obstructive diseases
Functional Residual Capacity Value _________ because _____ _______
increases
lungs hyperinflate
In restrictive diseases
Functional Residual Capacity __________ because _______ _______ __ ___________
decreases
lung expansion is limited
In obstructive diseases
Residual Volume _________ because _____ ________
increases
lungs hyperinflate
In restrictive diseases
Residual Volume ________ because _________ __________ __ _______
decrease
lung expansion is limited
In obstructive diseases
_______ _________ stays the same
vital capacity
In restrictive diseases
vital capacity __________ because _______ _________ __ ________
decreases
lung expansion is limited
FVC
Forced vital capacity
measures the amount of gas expelled when a subject takes a deep breath and forcefully exhales maximally and as rapidly as possible
FEV
Forced expiratory volume
determines the amount of air expelled during specific time intervals of the FVC test
FEV1
Volume exhaled during the _______ _________ __ ___ _____ __________
Healthy lungs can exhale 80% of the FVC within 1 second
Those with ___________ ______ __________ exhale considerably ____ than 80% of the FVC
Those with __________ ________ can exhale 80% or ______ of FVC in 1 second
first second of the FVC test
obstructive pulmonary disease
less
Restrictive disease
more