Pulm Function Tests

indications for spirometry

• detect presence of lung disease

• quantify extent of lung disease

• measure effects of exposures

• determine effects of therapy

• assess risk for surgical procedures

• evaluate disability or impairment

common spirometry measures

• FVC

• FEV1

• TLC

• RV

• FEF25-75

• Maximal Ventiliation (MVV)

• DLCO (diffusing capacity of lung for carbon monoxide)

• maximal inspiratory and expiratory pressure

what does a flow- volume loop NOT directly represent

Time

Flow-Volume Loop +Y axis

expiratory flow rate

Flow-Volume Loop -Y axis

inspiratory flow rate

Flow-Volume Loop +X axis

expired volume

Flow-Volume Loop -X axis

inspired volume

what should a Flow-Volume Loop look like normally

upside-down left lopsided icecream cone

What would a Flow-Volume Loop look like in someone with a restrictive disorder

tall and skinny

What would a Flow-Volume Loop look like in someone with a small airay obstruction

scooped out pac man vibes

how much increase in residual volume is needed before considered air trapping?

>100%

how much increase in TLC before considered hyperinflation

>120% predicted

what ratio is required to know if obstructive

FEV1/FVC and .7 is threshold

in restrictive disease, the FEV1/FVC ratio…… while the _______ decreases

stays normal, but the numbers both decrease; Total Lung Capacity

In mixed dysfunction, the ____ will decrease and the FEV1/FVC ration will ________

TLC and FEV1 , decrease