ORIGINAL INVESTIGATIONS Pathogenesis and Treatment of Kidney Disease Association of Uric Acid With Change in Kidney Function in Healthy Normotensive Individuals

Outcomes: Decrease in estimated glomerular filtration rate (eGFR) 10 mL/min/1.73 m 2 , computed using the Modification of Diet in Renal Disease (MDRD) Study equation, with secondary analyses examining similar decreases using the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) and Cockcroft-Gault equations. Results: During a median follow-up of 59 months, eGFR decreased from 97 16 to 88 14 mL/min/1.73 m 2 . Higher serum uric acid levels were associated with a greater likelihood of eGFR decrease in both women and men (HR, 1.13 [95% CI, 1.04-1.39] per each 1-mg/dL increase in uric acid level); in multivariable analyses adjusting for age, sex, body mass index, blood glucose level, total cholesterol level, mean blood pressure, urine albumin-creatinine ratio, and serum triglyceride level, the association remained highly significant (HR, 1.28 [95% CI, 1.12-1.48]). Results were similar using different estimating equations and when the association was examined in sex-specific subgroups. Limitations: Analyses were based on a single baseline uric acid measurement. Women are underrepresented. Conclusions: In healthy normotensive individuals, serum uric acid level is an independent risk factor for decreased kidney function. Am J Kidney Dis 56:264-272. © 2010 by the National Kidney Foundation, Inc.