Iron Sucrose in Patients With Iron Deficiency and POTS

5 mg/kg of intravenous iron sucrose (maximum dose of 200 mg). Iron sucrose will be diluted

Normal saline (NaCl 0.9%) 5 mL/kg (maximum volume 210 mL)

A table that adjusts the body position from horizontal to vertical to simulate standing up. Heart rate and blood pressure are monitored throughout the test.