Sodium Chloride and Contrast Nephropathy

Patients will receive capsules of sodium chloride and free water ingestion (for each capsule of sodium chloride, with 250 ml of water, assuring a minimum ingestion of 750 ml of water) in the 48 hours prior contrast injection. Patients will take capsules of sodium chloride at a dose of 100 mg/kg during 48 hours previous the injection of contrast (48, 40, 32, 24, 16, and 8 hours), at the moment of contrast injection and 12 hours after the injection of contrast.

Patients will receive at hospital 3 ml/Kg of sodium chloride 0.9%, one hour previous contrast injection and 2 ml/kg during the 4 hours after contrast injection.