Guidelines for blood transfusion have been issued for years. According to these guidelines,
red blood cells (RBCs) transfusion should be given when the hemoglobin level is less than
6g/dL or 7g/dL and is unnecessary when the level is more than 10g/dL. However, in all the
guidelines, the determination of whether RBCs should be administered when the hemoglobin
level is in the range of 6~10g/dL is based on the judgment from anesthesiologists or
surgeons. Index of transfusion trigger for patients with hemoglobin level between 6g/dL and
10g/dL is necessary and important in clinical practice.
Based on the aim of blood transfusion that maintain the balance of oxygen supply and oxygen
consumption, the investigators hypothesize that index of transfusion trigger for patients
with hemoglobin level between 6g/dL and 10g/dL could be calculated by parameters including
infusion rate of adrenalin for maintaining normal cardiac output, fraction of inspired
oxygen, core temperature, and angina. To verify this hypothesis, the investigators present
West China Perioperative Transfusion Score (WCPTS) for the trigger of transfusion according
to the patient's history and monitoring parameters, and the investigators design a randomized
controlled clinical trial to test this score.