Figure 6

Cytoplasmic ultrastructure of the myocardium under an electron microscope: a, b normal mitochondria structures were displayed, Z-line, M-line and intercalated disk is clear in the sham group (arrows). c, d The myocardial fiber and intercalated disk were obviously disordered, broken, even dissolved in the SA group 24 h after ROSC (arrows). e, f Animals treated with sildenafil exhibited little intracellular damage in the myocardium at 24 h after ROSC (arrows).