Table 1.

The myocardial histopathological changes among different groups (case (%), n = 7).

Group	Necrosis				Inflammatory cells infiltrating
	−	+	++	+++	−	+	++	+++
Control	7 (100%)	0	0	0	7 (100%)	0	0	0
Model	0	1 (14.3%)	4 (57.1%)	2 (28.6%)	0	1 (14.3%)	5 (71.4%)	1 (14.3%)
Metoprolol	0	5 (71.4%)	2 (28.6%)	0	0	1 (14.3%)	6 (85.7%)	0
WXKL	0	4 (57.1%)	3 (42.9%)	0	0	3 (42.9%)	4 (57.1%)	0
χ 2	19.923				19.475
P	0.000				0.000