PTEN and infarction: EF% and FS% ↑; LVIDd and LVIDd ↓; infarction area ↓; rat survival rate ↑; collagen content ↓; Bax protein expression ↓; Bcl-2 protein expression ↑; VEGF expression ↑; PTEN expression ↓; PI3K and phosphorylated Akt levels ↑