Pulmonary Vascular Volume by Quantitative CT in Dyspneic Smokers with Minor Emphysema.

Reduced lung diffusing capacity for carbon monoxide (DL) at rest and increased ventilation ()-carbon dioxide output (CO) during exercise are frequent findings in dyspneic smokers with largely preserved FEV. It remains unclear whether low DL and high -CO are mere reflections of alveolar destruction (i.e.