Journal of Applied Physiology
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J Appl Physiol 73: 2396-2402, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 73, Issue 6 2396-2402, Copyright © 1992 by American Physiological Society

ARTICLES

Alterations of filtration coefficients in pulmonary edema of different pathogenesis

T. Koch, H. P. Duncker, S. Rosenkranz, H. Neuhof and K. Van Ackern
Department of Anaesthesiology, Faculty for Clinical Medicine Mannheim, University of Heidelberg, Federal Republic of Germany.

Different pathomechanisms in the development of pulmonary edema are being discussed. We investigated the effect of pathogenetically varying forms of edema on lung vascular barrier function in isolated cell-free perfused rabbit lungs. As an index of permeability, capillary filtration coefficients (Kfc) were determined from the slope of lung weight change over periods of stepwise venous pressure elevation (5, 7.5, and 10 mmHg) before (controls) and 60 min after edema induction. Edema was induced by venous congestion (n = 6), by application of arachidonic acid in the presence of diclofenac sodium (n = 6), and by elastase application (n = 6). Control values ranged from 0.28 to 0.51 ml.min-1 x mmHg-1 x 100 g-1. Kfc was significantly enhanced after edema induction up to 243% of control value in the hydrostatic edema, 357% in the arachidonic acid edema, and 594% in the elastase edema. When the alterations in capillary filtration due to the different types of edema were compared, Kfc was significantly higher in the proteinase edema, indicating an irreversibly damaged barrier function. These data exemplify different pathophysiological characteristics due to the pathogenesis of interstitial edema formation.


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