Journal of Applied Physiology AJP: Heart and Circulatory Physiology
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J Appl Physiol 45: 659-665, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 45, Issue 5 659-665, Copyright © 1978 by American Physiological Society

ARTICLES

Modeling the effect of axial bronchial tension on expiratory flow

T. A. Wilson

Previous modeling of the expiratory flow-limiting mechanism is extended by including axial tension in the airway walls as one of the forces that affect airway mechanics. The analysis supports the Dawson-Elliott explanation of the plateaus in isovolume pressure-flow (IVPF) curves and shows that axial tension has the effect of increasing maximum flow and introducing a negative-effort-dependent region. Solutions for boundary conditions representing a cannula in the airways are qualitatively different with flow approaching zero as the pressure drop across the system becomes large.


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