Influence of lung parenchyma on pressure-diameter behavior of dog bronchi.

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Abstract
Comparisons were made between the pressure-diameter and pressure-length behavior of various-sized bronchial segments of the dog lung with the bronchial tree intact within the lobe and after its dissection free from the lung tissue. The mechanical behavior of the dissected tree approximated that of the intact tree rather closely with 2 exceptions: at low distending pressures the diameters of the dissected bronchi were somewhat larger, and at all pressures the lengths of the intact segments were slightly greater. No precise explanation for these differences was found. However, it seems reasonable to conclude that observations made on excised bronchial segments can be taken as fairly representative of the behavior of the bronchial tree surrounded by lung parenchyma. The data also support the assumption that, at least over lower distending pressures, the external walls of the larger intrapulmonary bronchi are exposed to essentially the same pressure that exists within the pleural space.

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