Lab 5 Flashcards
What is the magnitude and direction of the pressure during inspiration and expiration for a lung model?
Inspiration very slightly down
Expiration opposite
Why and how are asthmatics magnitude and direction of pressure during inhalation and exhalation different?
With a bigger hole, there is a bigger pressure gradient so more air can come through to equalize faster
Intrapleural pressure in the lung model vs humans + why different?
0
Negative
Model has no F therefore P.
Human has Fl and Fcw which increases the volume, leading to a small P
What force is massive in pneumothorax
Fcw
Shrinks V
What does the blow thing measure? What’s it called?
Dry spiromety
VC and peak expiratory flow rate
What is peak flow rate measured in
l/min
Two factors leading to difference in peak flow rates
Height
Sex
What is the peak flow rate like in young smokers vs old smokers?
Young: muscles haven’t developed so no change.
Old: muscles but lung deteriorating, COPD etc.
What is the name of the dry spirometer?
Vitalograph
What is the name of the wet spirometer?
Wet (Collins) spirometer
What does a vitalagraph measure?
Speed + how much exhale
Vital capacity + ——-?
Which is the most accurate way to determine FEV1 etc.?
Dry spirometer
What 2 things can’t be measured
Residual volume and total lung capacity
In obstructive diseases, the ____ May be decreased, although they may still have the same ______. The overall effect is ____ FEV1/FVC
FVC
Vital capacity
Decreased
What measures the entire graph ? And therefore list the 4 things it can measure?
Wet spirometer
TV, IRV, ERV, VC
