Measurement of compliance of the lungs and chest wall

Untrue statement regarding the measurement of compliance of the lungs and chest wall is:

A. Compliance is the change in airway pressure per unit change in lung volume
B. Compliance is a static measure of lung and chest recoil
C. A patient with only one lung has a compliance of approximately half that of a patient with both lungs
D. Compliance is slightly greater when measured during deflation than when measured during inflation

Answer. A. Compliance is the change in airway pressure per unit change in lung volume

• Compliance is a measure of the change in lung volume per unit change in airway pressure.

• Compliance is a 3tatic measure of lung and chest recoil. Compliance depends on lung volume and a patient with only one lung has approximately half the change in volume for a given change in airway pressure.

• Compliance is slightly greater when measured during deflation than when measured during inflation.

• Compliance is increased in emphysema and decreased in pulmonary oedema and interstitial pulmonary fibrosis