A) Perfusate oxygenation (ΔPO2) during reperfusion. After 10 minutes, ΔPO2 was decreased in surfactant treated lungs compared to untreated lungs. After 50 minutes, ΔPO2 decreased in untreated lungs compared to baseline. B) Pulmonary vascular resistance (PVR) during reperfusion. Repeated measures analysis revealed no significance in the difference of the time course between the groups. The increase in PVR is significant at 50 minutes vs. 10 minutes in both groups. C) Peak inspiratory pressure (PIP) during reperfusion. Whereas alterations in PIP in the surfactant treated group were not significant, the increase in PIP in untreated animals was significant at 50 min vs. 10 minutes. Points and squares represent mean values ± standard deviation. Asterisk indicates statistically significant difference between untreated and surfactant treated group.