Both during surgery and on postoperative days , the total volumes of fluids administered in the R group were significantly lower than those in the S group ( 1620 430 mL vs 3110 840 mL ; 2090 360 mL vs 2750 570 mL ; 1750 260 mL vs 2740 490 mL ; 1620 310 mL vs 2520 300 mL ; P < 0.05 ) .