Post-operative Intravenous Iron to Treat Iron-deficiency Anemia in Patients Undergoing Cardiac Surgery

Inclusion Criteria: Patients who are undergoing any non-emergency open cardiac surgery and who meet all following criteria: 1. Age greater than 18 years old 2. Preoperative iron-deficiency with or without anemia (defined as Hb \<130 g/L) with any one of: 1. ferritin ≤100 μg/l; or 2. ferritin ≤ 300 μg/L and transferrin saturation ≤ 20%; or 3. reticulocyte Hb content \< 29 pg, where available Exclusion Criteria: Patients who meet any of the following criteria are not eligible for the study: 1. specialized procedures (e.g., ventricular assist device insertion, thoracoabdominal aneurysm, complex adult congenital surgery and heart transplant) 2. established contraindications to IV iron: 1. hypersensitivity to the iron product 2. history of \>2 food and/or drug allergic reactions (excluding drug intolerance) 3. non-iron deficiency anemias such as myelodysplastic syndrome 4. history of iron overload or disturbances in use of iron such as hemochromatosis or hemosiderosis 5. decompensated liver cirrhosis (MELD ≥ 19) or active hepatitis 6. active infection 3. preoperative unstable hemodynamics defined as the requirement for vasopressors or inotropes, or active bleeding (as noted in the clinical record and/or defined as a requirement for red blood cell transfusion for ongoing clinical bleeding) 4. refusal of blood products for religious or other reasons 5. known pregnancy 6. already enrolled in this trial 7. enrolment in another interventional trial which may impact anemia or transfusion management (for example, a trial of hemostatic therapies, such as tranexamic acid) 8. receipt of intravenous iron at any point in the 6 weeks prior to randomization