EURO-COLLINS SOLUTION EXACERBATES LUNG INJURY IN THE SETTING OF HIGH-FLOW REPERFUSION

Single-lung transplantation has been abandoned for the treatment of pu lmonary hypertension by many centers because of overperfusion of the g raft following implantation, Euro-Collins solution is currently used f or lung preservation despite the vasoconstrictive effect of this intra cellular-type solution, We hypothesized that high-flow reperfusion, al one or in combination with Euro-Collins-induced vasoconstriction, may cause lung dysfunction, Twenty-eight New Zealand White rabbit lungs we re harvested and studied in an isolated, blood-perfused model of lung function after 4 hours of cold ischemia, Control lungs were preserved with 50 ml/kg cold saline solution hush and reperfused at either norma l flow (60 ml/min) or high how (120 ml/min). Experimental lungs were p reserved with 50 ml/kg cold Euro-Collins solution and reperfused at no rmal or high flow rates, The arteriovenous oxygen gradient at the end of the 30-minute reperfusion period was significantly lower in the hig h-how versus the low-flow experimental group (31.1 +/- 4.2 vs 130.6 +/ - 41.6 mm Hg, p < 0.05). The pulmonary vascular resistance was increas ed in the high-how groups and the experimental groups, with a statisti cally significant difference between low-flow experimental and control groups (64374.4 +/- 5722.6 vs 37041.5 +/- 2110.9 dynes . sec . cm(-5) , p < 0.001), The percentage decrease in dynamic airway compliance in the high-flow experimental group was markedly different from that in t he high-flow control group (-51% +/- 13.3% vs -10.15% +/- 3.4%, p < 0. 05), Similarly, the wet/dry ratio of the lungs in the high-how experim ental group (13.92 +/- 2.32) was significantly greater than that in th e low-flow experimental group (6.27 +/- 0.19, p < 0.01) and than that in the high-flow control group (5.88 +/- 0.23, p < 0.001), These data demonstrate that high-flow reperfusion and preservation with Euro-Coll ins solution are deleterious to lung function, both individually and i n combination, in an ex vivo rabbit lung model, Lung preservation with Euro-Collins solution may not be optimal when high-flow reperfusion i s anticipated, as in the setting of unilateral lung transplantation fo r pulmonary hypertension.