Evolution of myocardial edema area in G1 and G2 over time. The edema area in G2 is larger than that in G1 over time. The edema area in G2 peaks at 48 h, which gradually decreases from 48 h to 5 d, whereas the edema area in G1 peaks at 24 h.
G1: myocardial infarction without intramyocardial hemorrhage
G2: myocardial infarction with intramyocardial hemorrhage.