Fig. 1. H&E staining of the lung of the sham (A) and cardiac arrest (CA) operation (B–E) groups. In the CA operated lungs, histopathology is markedly increased at 12-hour post-CA (P<0.05). The histopathological change is more increased at 1- and 2-day post-CA, showing the thickness of alveolar septa and infiltration of a number of inflammatory cells and that alveoli are filled with pigment-laden macrophages and red blood cells. Scale bar=100 µm. (F) Lung lesion score of the sham and CA operation groups (n=7 per group; ^*P<0.05, significantly different from the sham group). The bars indicated the mean±standard error of mean.