Journal of Applied Physiology AJP: Regulatory, Integrative and Comparative Physiology
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J Appl Physiol 59: 1924-1928, 1985;
8750-7587/85 $5.00
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Journal of Applied Physiology, Vol 59, Issue 6 1924-1928, Copyright © 1985 by American Physiological Society

ARTICLES

Interdependence of regional expiratory flow

T. A. Wilson, J. J. Fredberg, J. R. Rodarte and R. E. Hyatt

Flows from different lung regions interact at the junctions of the bronchial tree, and flow from each region depends on the driving pressures for other regions. At each junction, flow from the region with the higher driving pressure is favored. As a result there is a limit on the difference in alveolar pressures that can develop during expiratory flow from a lung with regional differences in lung compliance and airway resistance. The limiting pressure difference is smaller for lower flow. A nonuniform lung therefore empties more uniformly if it empties slowly, and maximum flow at low lung volume may be greater than it would be at the same lung volume during a maximal expiratory vital capacity maneuver.


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