METHODS	The variables of hemodynamics , arterial blood lactate content ( Lac ) and gastric intramucosal partial pressure of carbon dioxide were measured at the following time points : after induction of anesthesia ( T1 ) , pre-revascularization ( T2 ) , grafting of left anterior descending ( T3 ) , right coronary descending ( T4 ) and left coronary circumflexus branches ( T5 ) , post-revascularization ( T6 ) , the end of operation ( T7 ) .\