Journal of Applied Physiology, Vol 63, Issue 3 942-950, Copyright © 1987 by American Physiological Society

ARTICLES

Lung reperfusion in dogs causes bilateral lung injury

M. J. Bishop, E. Y. Chi and F. W. Cheney Jr
Department of Anesthesiology, Harborview Medical Center, Seattle, Washington.

Occlusion of the pulmonary arterial circulation to a lung for prolonged periods has been reported to result in only minimal alterations in lung morphology. We studied the effects of 48 h of pulmonary arterial occlusion followed by 4 h of reperfusion in 18 awake dogs. Because of evidence in other organ systems of O2 radical generation, during reperfusion, nine of the animals were randomly assigned to receive allopurinol, a xanthine oxidase inhibitor, and vitamin E, an antioxidant. Reperfusion resulted in marked edema and inflammatory infiltrates in the reperfused lung but also caused mild edema and inflammation in the contralateral continuously perfused lung. Electron microscopy demonstrated lysis of both capillary endothelial and alveolar epithelial cells bilaterally, with the frequency of cell injury greater on the reperfused side. During reperfusion, body temperatures rose dramatically from 39.4 +/- 0.1 to 40.6 +/- 0.2 degrees C (P less than 0.05) and marked leukopenia developed. There were no differences in any hemodynamic, gas exchange, or morphometric measurements between allopurinol-treated dogs and untreated animals. We conclude that reperfusion causes local and distant injury which does not appear to be mediated by xanthine oxidase-produced O2 radicals.

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