Applied Pulmonary Physiology

Abstract

Mechanical changes in the lung may be separated into two groups, the first causing increased airway resistance, obstruction to air flow, and uneven ventilatory distribution, and the second causing restriction of lung expansion which decreases compliance and diminishes vital capacity. Tests which measure the rate of air flow and the lung volume permit evaluation of mechanical impairment and separation of the groups. The equipment is neither complex nor difficult to operate, and results can be readily interpreted by the practicing physician. Such tests together with blood gas and pH determinations afford insight into various parameters of pulmonary dysfunction.