A subject has a DLCOsb of 8.3 ml CO/min/mm Hg STPD,which is 38% of his predicted value.His calculated D_L/V_A ratio is 1.1.These values are most consistent with which of the following? A) Pulmonary emphysema B) Pulmonary resection C) Pulmonary fibrosis D) Pulmonary edema

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A DLCOsb that is 38% of predicted value indicates a significant impairment in gas exchange. A D_L/V_A ratio of 1.1 suggests that there may be some destruction of alveolar walls, which is a characteristic feature of emphysema. Pulmonary resection and pulmonary edema are unlikely to cause such a significant reduction in DLCOsb, and pulmonary fibrosis typically results in a decreased D_L/V_A ratio.

A Subject Has a DLCOsb of 8