Which of the following statements about compensation during cardiac insufficiency is correct?
选项：

A:Increased heart rate is an important compensation in chronic heart failure;
B:When heart rate reaches 180/min, patient’s cardiac output can be increased effectively;
C:Following the VEDP increase within a certain range, myocardial contractility increases;
D:Myocardial contractility increases with the development of myocardial hypertrophy;
E:Increased blood volume is an important compensation in acute heart failure