XDH and heart failure: Results: Our findings reveal that participants with elevated serum uric acid or xanthine oxidase inhibitor (XOI) therapy had a significantly higher incidence of cardiovascular events such as coronary artery disease (8.4% vs. 3.3%), stroke (2.6% vs. 1.2%), heart failure (3.4% vs. 0.9%), and chronic kidney insufficiency (4.5% vs. 1.9%) compared to those with normal uric acid levels.