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what is a PFT?
Pulmonary Function test that uses a spirometer to measure tidal volume
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what is a spirometer most useful for?
can distinguish between obstructive pulmonary diseases and restrictive airway diseases
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obstructive pulmonary diseases
increased airway resistance
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restrictive airway diseases
total reduced lung capacity
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TLC
total lung capacity
the maximum amount of air in lungs after a maximum inspiratory effort
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FRC
functional residual capacity
volume of air remaining in lungs after a normal tidal volume expiration
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RV
residual volume
amount of air remaining in lungs after after a forced expiration
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VC
Vital Capacity
Maximum amount of air that can be expired after a maximum inspiratory effort
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In obstructive diseases
Total lung capacity _________ because ______ ____________
increases
lungs hyperinflate
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In restrictive diseases
Total lung capacity _________ because ____ ________ __ ________
decreases
lung expansion is limited
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In obstructive diseases
Functional Residual Capacity Value _________ because _____ _______
increases
lungs hyperinflate
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In restrictive diseases
Functional Residual Capacity __________ because _______ _______ __ ___________
decreases
lung expansion is limited
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In obstructive diseases
Residual Volume _________ because _____ ________
increases
lungs hyperinflate
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In restrictive diseases
Residual Volume ________ because _________ __________ __ _______
decrease
lung expansion is limited
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In obstructive diseases
_______ _________ stays the same
vital capacity
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In restrictive diseases
vital capacity __________ because _______ _________ __ ________
decreases
lung expansion is limited
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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
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FEV
Forced expiratory volume
determines the amount of air expelled during specific time intervals of the FVC test
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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
