Correlation analysis
In order to make the results more intuitive, we used the absolute values instead of negative value of three-dimensional strain parameters in the Pearson linear correlation. GLS, GRS, GCS and GAS were negatively related to NT-proBNP in group C (r =-0.866、r =-0.587、r =-0.428、r =-0.600、P <0.001、P =0.001、P =0.020、P =0.010). And GLS is the only parameter that demonstrated a negative relationship with NT-proBNP in group B (r =-0.642、P <0.010). And correlation analysis showed that the absolute values of three-dimensional strains were negatively correlated with LVEDP in groups B and C: GLS (rB=-0.664, P < 0.001; rC=-0.832, P < 0.001), GRS (rB=-0.449, P=0.011; rC=-0.668, P < 0.001), GCS (rB=-0.390, P = 0.030; rC=-0.484, P=0.008) and GAS(rB =-0.468, P=0.008; rC=-0.586, P = 0.001).