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The Annals of Thoracic Surgery, Vol 47, 187-192, Copyright © 1989 by The Society of Thoracic Surgeons

ARTICLES

Reperfusion injury in the lung preserved for 24 hours

DE Paull, BA Keagy, EJ Kron and BR Wilcox
Division of Cardiothoracic Surgery, University of North Carolina School of Medicine, Chapel Hill 27599-7065.

The left lower lobes of 28 canine lungs were isolated, preserved, and then reperfused for 150 minutes. Five groups of lobes were studied: group 1, control (n = 5); group 2, one hour of warm ischemia (n = 5); group 3, one hour of warm ischemia + oxygen free radical scavengers (n = 5); group 4, 24 hours of cold ischemia (n = 8); and group 5, 24 hours of cold ischemia + oxygen free radical scavengers (n = 5). Oxygen free radical scavengers consisted of superoxide dismutase and catalase (100 micrograms/mL) given at the moment of reflow. Extravascular lung water (grams per gram of blood-free dry lobe weight) after reperfusion was 2.75 +/- 0.19, 5.46 +/- 0.60, 4.08 +/- 0.37, 9.43 +/- 0.98, and 6.91 +/- 0.95 for groups 1 through 5, respectively (p less than 0.05, groups 2 through 5 versus group 1; p less than 0.05, group 2 versus group 3 and group 4 versus group 5). Lung tissue lipid peroxidation, measured as thiobarbituric acid reactive material, was 117 +/- 14, 314 +/- 19, and 163 +/- 25 nmol/g dry lobe weight for groups 1, 4, and 5, respectively (p less than 0.05, group 4 versus group 1 and group 4 versus group 5). The data suggest that oxygen free radical scavengers attenuate reperfusion injury after long-term hypothermic lung preservation.

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