Fig. 1
a The heart function index was detected by left ventriculography. A 4f catheter was used according to the operation standard. The detection items included: left ventricular ejection fraction (LVEF), left ventricular short-axis shortening rate (LVFS), left ventricular end-diastolic diameter (LVEDD), left ventricular end-systolic diameter (LVESD). b The BNP level in serum was detected by ELISA, 5 ml of peripheral venous blood was extracted before and after treatment, respectively, and the BNP level was detected by enzyme-linked immunosorbent assay. c 1 × 104 cells were inoculated into a 6-well plate and cultured in a 5% CO2 incubator at 37 °C for 2 weeks. Crystal violet dye was added, and the number of clones was counted. d. The statistical analysis of clone number (*P < 0.05)