For the secondary outcomes pH ( clamped 7.350.05 versus unclamped 7.370.05 p = 0.015 ) , surgical score ( clamped 1.961.14 versus unclamped 1.220.51 p = 0.002 ) and CVP ( clamped 11.6 mmHg4 .8 mmHg versus unclamped 6.1 mmHg6 .1 mmHg p < 0.001 ) were significantly different .