What is the rationale for IV iron therapy in iron-deficient heart failure?

• A. Improves symptoms, functional capacity, QoL; reduces hospitalizations
• B. Worsens outcomes
• C. Always cures anemia but has no effect on outcomes
• D. Not recommended

Answer: (A)

Iron deficiency in heart failure worsens energy production in muscles, leading to fatigue, reduced exercise capacity, and poorer quality of life. The heart and skeletal muscles rely on iron for key enzymes in mitochondrial energy production, so when iron is scarce, energy supply drops and symptoms worsen. Administering iron intravenously replenishes iron stores quickly and reliably, bypassing absorption problems that can limit oral iron in the setting of inflammation. This boost in iron enhances muscle energetics and function, which translates into better symptoms, improved functional capacity, and higher quality of life. Importantly, trials have shown that IV iron in iron-deficient heart failure also lowers rates of heart-failure–related hospitalizations, beyond just improving anemia in some patients. It’s not about curing anemia in every case, and it’s not a therapy for patients without iron deficiency.