Chronic heart disease and Anaemia. Heart failure is a very common disease, with severe morbidity and mortality, and is a frequent reason of hospitalization. Anemia and a concurrent renal impairment are two major risk factors contributing to the severity of the outcome. Heme iron is absorbed through a separate pathway and does not have to be discontinued when intravenous treatment is started. This can allow for longer intervals between resource-heavy, inconvenient and painful injections. Oxidative stress is also avoided. Heme iron does not need to be discontinued during injection or EPO therapy like non-heme oral iron.