Figure 4 Histopathologic sections of the lung tissue. The sections of a sham IIR pig (A1, A2), a saline-pretreated IIR pig (B1, B2), and a propofol-pretreated IIR pig (C1, C2). The lung tissue of the pig with IIR shows severe damage, with alveolar collapse, a widened alveolar septum, small blood vessel bleeding, and neutrophil infiltration. Propofol significantly attenuated the changes induced by IIR. A1-C1 are displayed with 100 times magnification, while A2-C2 are displayed with 200 times magnification. The lung histopathologic score is displayed in panel D. ** P<0.01 compared with the sham group, # P<0.05 compared with the IIR+NS group. a, ×100; b, ×200. IIR – intestinal ischemia-reperfusion; NS – normal saline; P – propofol.