Figure 3

TUNEL analysis of cardiomyocyte apoptosis in the sham (a), saline (b) and sildenafil (c) groups at 24 h after ROSC: the brown nuclei indicate TUNEL-positive nuclei. Magnification, ×400. d Apoptosis index. The value represent mean ± SD. *p < 0.05, **p < 0.01 vs. sham, ^#p < 0.05 vs. saline.