BSI- Bispectral Index, MAP-Mean arterial pressure, t1= baseline, t2= time sternotomy, t3=time of coronary anastomosis, t4= time sternal closure placement. CVP-Central venous pressure, MPAP - Mean pulmonary arterial pressure, VOS2% -Percentage of venous oxygen saturation, CO-Cardiac output, Temp-Temperature. Values are expressed as mean standard deviation (SD).