Diffusing Capacity is Reduced in Emphysema Because of Which of the Following

Question

Diffusing capacity is reduced in emphysema because of which of the following?
A) Loss of alveolar surface area
B) Engorgement of pulmonary capillaries
C) Dynamic airway compression
D) Elevated pulmonary arterial pressure

Accepted Answer

In emphysema, there is destruction of alveolar walls leading to loss of alveolar surface area for gas exchange. This results in a reduction of the diffusing capacity of the lungs, which is the ability of the lungs to transfer gases from inhaled air into the bloodstream. Engorgement of pulmonary capillaries, dynamic airway compression, or elevated pulmonary arterial pressure do not directly contribute to the reduction in diffusing capacity seen in emphysema.