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 -LSB- LVESI ( mL/m ) : @ @ vs. @ @ , t = @ , P = @ ; LVEDI ( mL/m ) : @ @ vs. @ @ , t = @ , P = @ -RSB- , and the LVEF was significantly increased ( @ @ vs. @ @ , t = -@ , P = @ ) .