Efficacy and Safety of a Beet-Derived Inorganic Nitrate-Based Food Product for the Prevention of Contrast-Induced Nephropathy in High-Risk Patients Undergoing Percutaneous Coronary Intervention

This intervention consists of an orally administered food product enriched with inorganic nitrates derived from beetroot. Participants in the intervention group will consume a standardized dose of 12 mmol of nitrate per day for 5 days (starting 24 hours before PCI and continuing for 4 days post-procedure). The product is designed to enhance nitric oxide bioavailability, improve renal perfusion, reduce oxidative stress, and lower the risk of contrast-induced nephropathy (CIN).