Research Methods Prospective, randomized, double-blind, placebo-controlled research. All patients who are in the cardiac surgery department for bypass surgery, valve replacement surgery or combined surgery will be eligible to participate in the study. The study will be presented and explained to all patients and, if they consent, patients will be divided into two random groups. One group will receive Ferinject IV 24-48 hours prior to surgery. The second group will receive a placebo drug in the same time period as when the drug Ferinject is administered.