Compared with dobutamine group , after the treatment in the levosimendan group , stroke volume index ( SVI ) , cardiac index ( CI ) and left ventricular stroke work index ( LVSWI ) were significantly increased [ SVI ( mL/m ) : 39.8 5.4 vs. 37.5 4.5 , t = -2.762 , P = 0.020 ; CI ( L min m ) : 4.6 0.7 vs. 3.6 0.7 , t = -9.829 , P = 0.000 ; LVSWI ( kg min m ) : 33.7 2.4 vs. 28.2 1.2 , t = -6.307 , P = 0.000 ] , and central venous pressure ( CVP ) , intrathoracic blood volume index ( ITBVI ) and extravascular lung water index ( EVLWI ) were significantly decreased [ CVP ( mmHg , 1 mmHg = 0.133 kPa ) : 8.2 0.9 vs. 12.1 0.8 , t = 3.928 , P = 0.002 ; ITBVI ( mL/m ) : 820 42 vs. 978 69 , t = 9.472 , P = 0.000 ; EVLWI ( mL/kg ) : 6.1 1.6 vs. 8.9 1.7 , t = 4.467 , P = 0.001 ] .