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[Experimental studies on the effects of superoxide dismutase on warm ischemic-reperfusion injury of the lung].

Transient impairment of the transplanted lung in early postoperative period is one of difficult problems in lung transplantation. It is likely that reperfusion injury of the warm ischemic lung is contributory. The purpose of this study is to evaluate the effects of superoxide dismutase (SOD) on reperfusion injury of warm ischemic lung. Thirty mongrel dogs were divided into four groups. In group I (n = 6), the left lung with complete hilar stripping was placed in warm ischemic state under deflation for 1 hour. In group II (n = 9), the left lung with complete hilar stripping was kept in warm ischemic condition under inflation. Group III (n = 6) animals with same manipulation as group I received superoxide dismutase (SOD 20 mg/kg) before reperfusion. Group IV (n = 9) animals underwent same manipulation as group II and received SOD (20 mg/kg) before reperfusion. Before warm ischemia, immediately after reperfusion, and 1 and 2 hours, blood gases, left pulmonary vascular resistance were measured under the occlusion of right pulmonary artery. Extra vascular lung water content (EVLW) was measured at autopsy and lung was processed for histology. In group II, III and IV, blood gases and EVLW showed significantly better values than group I. In group I and III, left pulmonary vascular resistance increased prominently after reperfusion, however did not change in group II and IV. From these results, we concluded that inflated lung reduced the extent of pulmonary edema after reperfusion and SOD was effective in preventing warm ischemic damage even in deflated lung.