Thoracic Restriction

Question 1

Normal Campbell diagram

Answer 1

Lung V increasses with negative pressure

Chest wall with positive

Curves meet at FRC

Question 2

Decreased static lung compliance effect

Answer 2

This could be in pulmonary fibrosis

Lowers the FRC and therefore lower lung volumes

Takes more neg pressure to get same amount of volume

Question 3

Decreased chest wall static ocmpliance

Answer 3

Decreased FRC

Obesity

Both lung volumes small with clear lungs

Question 4

NM weakness

Answer 4

Reduced muscle power leads to reduced lung inflation but FRC is NOT changed

Lower lung volumes with normal marking

Question 5

Pleural disease

Answer 5

Pleural fluid will compress lung and limit expansion

Question 6

Atelectasis

Answer 6

Collapse of left lung will produce some right lung hyperexpansion but does not fully compensate

Question 7

Psuedorestriction

Answer 7

AIrflow obstruction

Will actually appear larger

Larger TLC, but the FVC reduced due to high RV

FEV/FVC ratio lower than .75 means obstruction