SOD1 and myocardial infarction: Combined with pharmacological tests such as electrocardiogram (ECG) changes, activity of enzymes (CK, LDH, SOD, and MDA), and myocardial infarction area (Additional file 1: Figure S2, Additional file 1: Table S2-S4), we can conclude that the combination-based treatment groups were better than the single herb (PG or SM) groups and the combination of PG and SM at a ratio of 7:3 and 8:2 exhibited the best therapeutic efficacies on MI rats.