DSA pulmonary functions

Question 1

indications

Answer 1

to evaluate symptoms and signs of lung dis

Question 2

Obstructive diseases and residual volume

Answer 2

Can see the air trapping and hyperinflation

Question 3

For restrictive diseases and RV

Answer 3

total lung capacity is needed to confirm true restriction and better quantitate the degree of restriction

Question 4

FEV1/FVC lower than normal

Answer 4

obstructive defect is present. (FEV1 has fallen to a greater degree than FVC

Question 5

FEV1/FVC greater than normal

Answer 5

Normal or restrictive defect. Look at FVC if less than normal restrictive is present. confirm with with TLC if it is less then predicted

Question 6

Mixed vs Air trapping

Answer 6

If FVC is below normal. Mixed is if the TLC is lower than normal. Air trapping is in severe cases of obstruction. normal TLC but higher than normal RV (pseudorestriction)