Change heart rate after placing the ball: After IABP, the heart rate gradually decreased and changed significantly from 72 hours, from 125.1 ± 15.2 to 97.1 ± 5.6 beats / minute (p <0.01), survival group: heart rate changes earlier than the mortality group, significant after 6 hours of placing the ball (124.1 ± 16.5 to 110.1 ± 7.0 beats / minute), p <0.05.