Venoarterial CO2 difference(delta PCO2), lactate, central venous oxygen saturation(ScVO2) will be recorded in several steps in coronary artery bypass graft and valvular cardiac operations. The patients will be divided into four groups as Nonanemic-Transfused, Nonanemic- Not transfused, Anemic- Not-Transfused, Anemic-Transfused Groups observationally. The trend of delta CO2, lactate, ScVO2, postoperative creatinine values, postoperative complications and 28 days mortality will be compared.