An obstructive ventilatory defect (OVD) is defined by a low forced expiratory volume/'forced/slow' vital capacity (FEV1/FVC) (e.g. <lower limit of normal (LLN)).
Is obstructive ventilatory defect the same as COPD?
Since the hallmark of COPD is an obstructive ventilatory defect, pulmonary function testing (PFT) is the only standard for diagnosis. An FEV1 value divided by forced vital capacity of less than 70% defines an obstructive ventilatory defect.
What causes obstructive ventilatory defect?
Causes and risk factors
According to the National Heart, Lung, and Blood Institute, the main risk factor for obstructive lung disease is smoking. Up to 75 percent of people who have COPD either smoke or used to smoke. Exposure to other lung irritants through the environment can also cause obstructive lung disease.
