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Objective To analyze the alterations of SevO2 and SvO2 and the hemodynamic changes during off-pump coronary artery bypass graft (OPCABG) surgery, detect the correlation and consistency between ScvO2 and SvO2, and the correlation between ScvO2/SvO2 and CI,respectively.To investigate the possibility of replace SvO2 with ScvO2,and to guide the management of the mismatch of oxygen demand and consumption during OPCABG.