The Prevalence of Iron Deficiency and the Effectiveness of Ferinject® in Patients With HFpEF (ID-HFpEF)

This study is looking at how common iron deficiency is in patients with a specific type of heart failure where the heart's pumping function is preserved (called HFpEF), and whether an iron infusion (Ferinject) helps improve symptoms. **You may be eligible if...** - You have stable, symptomatic chronic heart failure with a preserved pumping function (ejection fraction of 50% or more) - Your heart failure symptoms are rated moderate to severe (NYHA class II-III) - You have signs of iron deficiency: ferritin below 100, or ferritin 100–299 with low transferrin saturation (under 20%) - You have elevated levels of a heart stress marker (natriuretic peptide) - You have signed informed consent **You may NOT be eligible if...** - You have iron levels above the required threshold - You have certain other heart or blood conditions your doctor will review Talk to your doctor to see if this trial is right for you.