In patients undergoing cardiac surgery, perioperative anemia is an important factor in surgical recovery. In addition to the low preoperative hemoglobin level, the delayed recovery of the postoperative hemoglobin level is an important problem affecting the incidence of postoperative anemia. Erythroferron is the early response to of the red blood cell production in stressful situations such as anemia, bleeding, and hypoxia. Therefore, it is thought that acute blood loss and systemic inflammatory reaction that inevitably occurs after cardiac surgery will synthesize erythroferron, which helps to restore hemoglobin level at postoperative period by promoting hematopoiesis by simultaneously inhibiting hepcidin and activating hematopoiesis. In this study, the investigators will investigate the association between Erythroferron and perioperative hemoglobin levels in patient undergoing heart valve surgery.
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Change of hemoglobin concentration level after surgery in patients undergoing heart valve surgery
Timeframe: immediate after surgery, POD1, POD2, POD7, first outpatient vist after discharge (until 6 months)