LVEF decreases gradually from the group of Killip I: 51.76 ± 11.57 (%), Killip II: 47.84 ± 15.55 (%), Killip III: 45.85 ± 14.92 (%), Killip IV: 43.67 ± 15.23 (%), discrimination of Killip degree increases gradually, but there isn't a statistical meaning with p > 0.05.