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J Appl Physiol 65: 1140-1146, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 65, Issue 3 1140-1146, Copyright © 1988 by American Physiological Society

ARTICLES

Increase in pulmonary capillary permeability in dogs exposed to 100% O2

F. Royer, D. J. Martin, G. Benchetrit and F. A. Grimbert
Laboratoire de Physiologie, Faculte de Medecine de Grenoble, La Tronche, France.

Changes in pulmonary capillary filtration induced by hyperoxia were investigated in 15 dogs. After 12 h of normobaric hyperoxic exposure, animals were anesthetized and artificially ventilated with 100% O2. A pulmonary lymphatic vessel was cannulated, and lymph flow and protein content were measured together with pulmonary and systemic hemodynamics. An increase in pulmonary capillary filtration was found when compared with reference data (normoxic dogs in similar conditions) gathered from available literature: lymph flow increased from 21.8 +/- 13.4 to 125.2 +/- 131.6 microliter/min, and the lymph-to-plasma protein concentration ratio increased from 0.67 +/- 0.08 to 0.78 +/- 0.08. To characterize the mechanisms involved, left atrial pressure was increased in two stages (approximately 10 and approximately 25 mmHg). The results clearly indicated an increase in pulmonary capillary permeability as evidenced by a decrease of the minimal estimate of the protein reflection coefficient from 0.62 +/- 0.05 to 0.42 +/- 0.05.


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