Pulmonary Function Testing Flashcards
What is the most accurate way to test measurements of the lungs (FRC, RV, TLC)?
Plethysmograph
What is spirometry testing?
Device that measures the volume of air a subject exhales and the rate they exhale
How is spirometry testing done?
Exhaling as forcefully as possible after taking a full inspiration (should be performed in standing)
Total lung capacity (TLC)
Maximal volume air contained in lung at end of max inspiration (5-7L)
Vital capacity/forced vital capacity
Maximal volume of gas that can be expired in a single breath after max inspiration (men=5L, women=3.8L)
Tidal volume (TV)
Volume of gas expired during normal breathing (.4-.7L)
Minute ventilation (VE)
Amount of air expired per minute (TV x RR, 4L per min)
Residual volume (RV)
Amount of air remaining in lungs after max expiration (1L)
Inspiratory reserve volume (IRV)
Volume of additional air that can be inhaled after normal breath in
Expiratory reserve volume (ERV)
Volume of additional air that can be exhaled out after normal breath out
Functional residual capacity (FRC)
Volume of gas that remains in lungs at end of normal breath out (ERV+RV)
What is the importance of functional residual capacity(FRC)?
Equilibrium point between recoil of lung and chest and the end of normal expiration
Maximum voluntary ventilation (MVV)
Volume of gas that can be breathed in 12 seconds when a person breaths as deeply and quickly as possible
What is the acceptable normal value for MVV?
Greater than FEV1 x 40
Diffusion capacity (DLCO)
Normal is >80%
