Bronchial patency in dust diseases

Abstract

Currently, the role of bronchospasm in the development of respiratory insufficiency in pulmonary patients has been fully proven [1, 4, 8, 9, etc.]. The severity of bronchospasm is usually determined using a pneumotachometer of the power (maximum volumetric velocity) of the air jet during exhalation [3, 4, 10, 12). However, a pneumotachometrically recorded decrease in the absolute figures of the maximum volume expiratory velocity, apparently, is not always a criterion of bronchospasm. G. O. Badalyan (1962), proposing to express the actual expiratory power as a percentage of the proper value, found that with normal bronchial patency, this ratio is at least 85%. For the proper amount of exhalation power, they took the actual WEL multiplied by 1.2.