Inspiratory resistive breathing induces acute lung injury

American Journal of Respiratory and Critical Care Medicine
Dimitris ToumpanakisTheodoros Vassilakopoulos

Abstract

Resistive breathing is associated with large negative intrathoracic pressures. Increased mechanical stress induces high-permeability pulmonary edema and lung inflammation. To determine the effects of resistive breathing on the healthy lung. Anesthetized rats breathed through a two-way nonrebreathing valve. The inspiratory line was connected to a resistance setting peak inspiratory tracheal pressure at 50% of maximum (inspiratory resistive breathing), while 100% oxygen was supplied to prevent hypoxemia. Quietly breathing animals (100% oxygen) served as controls. Lung injury was evaluated after 3 and 6 hours of resistive breathing. After both 3 and 6 hours of resistive breathing, lung permeability was increased, as assessed by (99m)Tc-diethylenetriaminepentaacetic acid scintigraphy and Evans blue dye extravasation. Tissue elasticity, measured on the basis of static pressure-volume curves and by the low-frequency forced oscillation technique, was also increased. After both 3 and 6 hours of resistive breathing, gravimetric measurements revealed the presence of pulmonary edema and analysis of bronchoalveolar lavage showed increased total protein content, whereas the total cell count was elevated only after 6 hours of resistive breat...Continue Reading

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