Which of the following measure is typically increased in patients with restrictive lung disease?
a. Lung compliance
b. Lung volumes
c. Pressure needed to expand the lung
d. Airway resistance
ANS: C
The primary problem in restrictive lung disease is reduced lung compliance, thoracic compliance, or both lung and thoracic compliances. Compliance is the volume of gas inspired per the amount of inspiratory effort; effort is measured as the amount of pressure created in the lung or in the pleural space when the inspiratory muscles contract. Compliance is calculated according to the following formula: C = ?V/?P.
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