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18 terms

Lung Function Tests

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Would you use spirometry to measure RV and TLC
no
What is one of the main measurements attained from spirometry
FVC and FEV; compared to the tidal waves; Peak expiratory flow rate, Mid-maximal expiratory flow (FEF 25-75)
what does inert gas (He) dilution measure
FRC using the mass balance equation
what other pressure can you obtain by having a patient put her lips tights around a tube
alveolar pressure
what does plethysmography measure
FRC
what princple is plethysmopgraphy based on?
boyle's law
lung compliance and airway resistance can be measured by
a flow meter and an esophageal balloon
what does a normal result for a esophageal ballon test look like
Clstat=Cldyn
What part of the the slope in the single breath nitrogen test indicates poor distribution of ventilation
Phase III
What does phase II of nitrogen elimination test show
50% dead space and 50% alveolar
What is the residual volume for a person with restricve disease
decreased
What is the residual volume for a person with obstructive disease
increased
Who has a more difficult time expiring, a person with obstructive or restrictive disease
obstructive
T/F obstructive disease maximal expiratoin begins and and ends at higher lung volumes than normal
TRUE
What is the relationship of restrictive disease expiratory flow rate to normal flow rate
increased
what is the hallmark of all obstructive disease
premature airway exposure
why is TLC increased in a patient with obstructive pulmonary disease despite the fact that their VC is decreased
increased "trapped air", increased FRC
why are crackles heard in people with asthma
crackles are produced by opening of airways that closed on the previous breath