Effect of Intravenous Ferrous Sucrose on Exercise Capacity in Chronic Heart Failure

This is a two-center, randomised, single-blind (physician), prospective, controlled study to assess the acute (8 weeks) and chronic (16 weeks) effects of intravenous (IV) iron sucrose supplementation in anaemic and non-anaemic iron deficient patients with chronic heart failure (CHF). The hypotheses are: * Treatment of anaemic and non-anaemic iron-deficient CHF patients with IV iron sucrose improves exercise capacity as measured by peak VO2. * IV iron sucrose is safe and well tolerated in subjects with moderate to severe CHF.