Decreased total pulmonary compliance is most consistent with which pulmonary disease?

Decreased total pulmonary compliance is most consistent with which pulmonary disease?

• A. Emphysema
• B. Chronic bronchitis
• C. Restrictive pulmonary disease
• D. Pulmonary emphysema and chronic bronchitis

Answer: (C)

Total pulmonary compliance reflects how easily the entire respiratory system expands; when it’s decreased, the system is stiff and requires more pressure to achieve the same volume. This stiffness is a hallmark of restrictive pulmonary disease, where fibrotic or other parenchymal changes make the lungs less distensible and the total lung capacity reduced. Emphysema increases compliance because destruction of elastic tissue makes the lungs easier to stretch, though they don’t recoil as well. Chronic bronchitis is primarily an airway-obstruction issue rather than a problem of lung stretch, so it doesn’t characteristically cause decreased compliance. A combination of emphysema and chronic bronchitis can produce mixed patterns, but decreased overall compliance is most consistent with restrictive lung disease.

Total pulmonary compliance reflects how easily the entire respiratory system expands; when it’s decreased, the system is stiff and requires more pressure to achieve the same volume. This stiffness is a hallmark of restrictive pulmonary disease, where fibrotic or other parenchymal changes make the lungs less distensible and the total lung capacity reduced.

Emphysema increases compliance because destruction of elastic tissue makes the lungs easier to stretch, though they don’t recoil as well. Chronic bronchitis is primarily an airway-obstruction issue rather than a problem of lung stretch, so it doesn’t characteristically cause decreased compliance. A combination of emphysema and chronic bronchitis can produce mixed patterns, but decreased overall compliance is most consistent with restrictive lung disease.