Journal of Applied Physiology
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J Appl Physiol 68: 125-129, 1990;
8750-7587/90 $5.00
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Journal of Applied Physiology, Vol 68, Issue 1 125-129, Copyright © 1990 by American Physiological Society

ARTICLES

Bronchial circulation in pulmonary artery occlusion and reperfusion

T. F. Kowalski, S. Guidotti, M. Deffebach, P. Kubilis and M. Bishop
Department of Anesthesiology, University of Washington, Seattle 98195.

Obstruction of pulmonary arterial blood flow results in minimal biochemical and/or morphological changes in the involved lung. If the lung is reperfused, a syndrome of leukopenia and lung edema occurs. We used the radiolabeled microsphere technique to measure the response of the bronchial circulation in rabbits to acute pulmonary artery occlusion (PAO) and to pulmonary artery reperfusion. We found that the bronchial blood flow (Qbr) decreased from a base line of 0.37 +/- 0.10 to 0.09 +/- 0.04 (SE) ml.min-1.g dry lung-1 (P less than or equal to 0.05) after 4 h of PAO. In a separate group of animals, Qbr 24 h after PAO remained low (0.20 +/- 0.07 ml.min-1.g dry lung-1, P = 0.06). Qbr during PAO was inversely correlated with the wet-to-dry ratio after reperfusion (r = -0.68, P = 0.06). Qbr did not change during 4 h of reperfusion. We speculate that a critical level of Qbr may be necessary during PAO to prevent ischemia/reperfusion injury from occurring.


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