Representative photomicrographs of heart in experimental groups: Normal morphology of heart in control group (A); degenerated cardiac muscle fibers (arrow), haemorrhage (*) and inflammatory cells (arrowhead) in CRF group (B); quite regular cardiac muscle fibers, decrease of vascular congestion (*) and inflammatory cells (arrowhead) in CRF+CAP (C), CRF+VAL (D), CRF+NAC (E), CRF+CAP+NAC (F) and CRF+VAL+NAC (G) groups are seen. H andE staining, original magnifications: 400x.