Pulmonary Testing

Question 1

Chest Films

Answer 1

Airway - density
Bones - Spacing, levels
Circulation - Heart occupancy
Diaphragm - Angles, shape
Everything Else - lines, tubes

Question 2

Diffusing Capacity (DLCO)

Answer 2

Surface area is reduced in atelectasis, emphysema

Membrane thickness is increased in pulmonary fibrosis

Partial pressure gradient is reduced by factors affecting the distribution of ventilation or perfusion

Question 3

Forced Vital Capacity (FVC)

Answer 3

Total volume of air exhaled during max effort
Approximates stroke volume

Normal: 5 liters
Obstructive and Restrictive disease: ~2.5 liters

Question 4

FEV1

Answer 4

Volume of air exhaled in one second

Normal: 4 L
Obstructive: 0.7 L
Restricted: 2.2 L

Question 5

Ratio of the forced expiratory volume values

Answer 5

Normal: 80%
Obstructive: <70%
Restricive: may be >80%

Question 6

What disease has the greatest Residual Volume?

Answer 6

Obstructive disease