Pulmonary Function Tests

Question 1

Comparison of obstructive vs restrictive lung disease

Answer 1

Obstructive 
Decreased flow rates (most marked during expiration) 
Air trapping (Increased RV/TLC)
Hyperinflation (increased FRC, TLC) 
FEV1/FVC - decreased 
Total lung capacity - increased or normal 
Residual volume - increased or normal 
RV/TLC - increased or normal 
DLco - anything 

Restrictive 
Decreased lung compliance 
Decreased lung volumes 
FEV/FVC - increased or normal 
TLC - decreased 
RV - decreased 
RV/TLC - normal 
DLco - decreased or normal

Question 2

Obstructive lung diseases differential diagnosis

Answer 2

Asthma 
COPD
CF
Bronchiolitis 
Bronchiectasis

Question 3

Restrictive lung diseases differential diagnosis

Answer 3

ILD
Pleural disease
Neuromuscular disease
Chest wall disease