Cardiac ultrasound showed that compared with dobutamine group , in the levosimendan group , left ventricular end-systolic volume ( LVESI ) and end-diastolic volume ( LVEDI ) were significantly lowered [ LVESI ( mL/m ) : 32.7 9.2 vs. 48.2 13.4 , t = 0.882 , P = 0.000 ; LVEDI ( mL/m ) : 61.7 11.4 vs. 78.6 13.6 , t = 2.453 , P = 0.032 ] , and the LVEF was significantly increased ( 0.463 0.068 vs. 0.383 .085 , t = -2.439 , P = 0.035 ) .