(a-e) Electrocardiographic patterns. (a) ECG of normal rat's heart showing normal ST segments. (b) ECG of ISO-treated rats (85 mg/kg body weight). (c) ECG of GaoZao treated rats (650 mg/kg body weight). (d) ECG of RouDouKou-treated rats (650 mg/kg body weight). (e) ECG of FCN (325 mg/kg GaoZao +325 mg/kg RouDouKou body weight) treated rats showing relatively normal ST segments. (f) The ratio of abnormal ECG rats in each group.