All are decreased in infiltrative lung disease except: (A) Vital capacity, (B) Alveolar aerial difference in PaO2, (C) Total lung capacity, (D) Lung compliance
Answer is B. In infiltrative lung disease the alveolar capillary bed is damaged and there is a decrease in diffusion capacity.this results in an increase in alveolar aerial differences in PaO2 Ref Harrison 19th edition pg 1710