Primary Outcome Measures:
- perioperative data [ Time Frame: 1 year after surgery ]
To obtain the perioperative data in patients undergoing cardiac surgery. Data will be collected including demographics, surgery and postoperative complications.
In addition, laboratory data such as coagulation and cytokine will be obtained. Intraoperative monitoring including bispectral index, cerebral oximeter, tissue oxygen saturation [InspectraTM StO2 (Hutchinson Technology Inc., MN, USA)], cardiac index [FloTrac/EV1000 (Edwards Lifesciences, Irvine, CA, USA), VolumeView/EV1000 (Edwards Lifesciences, Irvine, CA, USA), Vigilance II (Edwards Lifesciences, Irvine, CA, USA)] and mixed venous oxygen saturation will be evaluated.