Cardiac output ( CO ) , cardiac index ( CI ) , and stroke volume ( SV ) were significantly ( P < 0.001 ) higher in AVDopt group than in AVDfab group ( CO : 6.0 1.4 L/minute vs. 5.3 1.2 L/minute ; SV : 85.8 25.7 mL vs. 76.9 22.5 mL ; CI : 3.2 0.7 L/minute/m ( 2 ) vs. 2.7 0.6 L/minute/m ( 2 ) ) .