Effects of Iron Therapy in Heart Failure With Preserved Ejection Fraction and Iron Deficiency (PREFER-HF)

The group assigned to placebo will receive an infusion of normal saline solution plus oral lactose capsules identical to oral medication.

The group assigned to receive intravenous iron will receive intravenous ferric carboxymaltose ajusted by weight and Hb levels according to study protocol plus oral placebo

One group assigned to receive oral iron will receive two 100 mg oral capsule of ferroglycine sulfate plus intravenous placebo (normal saline solution)

One group assigned to receive oral iron will receive or two oral capsule containing 30 mg of pyrophosphate sucrosomial iron plus intravenous placebo (normal saline solution)