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Uric acid and incident kidney disease in the community.

Uric acid may mediate aspects of the relationship between hypertension and kidney disease via renal vasoconstriction and systemic hypertension. To investigate the relationship between uric acid and subsequent reduced kidney function, limited-access data of 13,338 participants with intact kidney function in two community-based cohorts, the Atherosclerosis Risks in Communities and the Cardiovascular Health Study, were pooled. Mean baseline serum uric acid was 5.9 +/- 1.5 mg/dl, mean baseline serum creatinine was 0.9 +/- 0.2 mg/dl, and mean baseline estimated GFR was 90.4 +/- 19.4 ml/min/1.73 m(2). During 8.5 +/- 0.9 yr of follow-up, 712 (5.6%) had incident kidney disease defined by GFR decrease (>or=15 ml/min/1.73 m(2) with final GFR <60 ml/min/1.73 m(2)), while 302 (2.3%) individuals had incident kidney disease defined by creatinine increase (>or=0.4 mg/dl with final serum creatinine >1.4 mg/dl in men and 1.2 mg/dl in women). In GFR- and creatinine-based logistic regression models, baseline uric acid level was associated with increased risk for incident kidney disease (odds ratio 1.07 [95% confidence interval 1.01 to 1.14] and 1.11 [95% confidence interval 1.02 to 1.21] per 1-mg/dl increase in uric acid, respectively), after adjustment for age, gender, race, diabetes, systolic BP, hypertension, cardiovascular disease, left ventricular hypertrophy, smoking, alcohol use, education, lipids, albumin, hematocrit, baseline kidney function and cohort; therefore, elevated serum uric acid level is a modest, independent risk factor for incident kidney disease in the general population.