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Serum uric acid as a predictor for development of diabetic nephropathy in type 1 diabetes: an inception cohort study #MMPMID19411615
Hovind P; Rossing P; Tarnow L; Johnson RJ; Parving HH
Diabetes 2009[Jul]; 58 (7): 1668-71 PMID19411615show ga
OBJECTIVE: Experimental and clinical studies have suggested that uric acid may contribute to the development of hypertension and kidney disease. Whether uric acid has a causal role in the development of diabetic nephropathy is not known. The objective of the present study is to evaluate uric acid as a predictor of persistent micro- and macroalbuminuria. RESEARCH DESIGN AND METHODS: This prospective observational follow-up study consisted of an inception cohort of 277 patients followed from onset of type 1 diabetes. Of these, 270 patients had blood samples taken at baseline. In seven cases, uric acid could not be determined; therefore, 263 patients (156 men) were available for analysis. Uric acid was measured 3 years after onset of diabetes and before any patient developed microalbuminuria. RESULTS: During a median follow-up of 18.1 years (range 1.0-21.8), 23 of 263 patients developed persistent macroalbuminuria (urinary albumin excretion rate >300 mg/24 h in at least two of three consecutive samples). In patients with uric acid levels in the highest quartile (>249 micromol/l), the cumulative incidence of persistent macroalbumnuria was 22.3% (95% CI 10.3-34.3) compared with 9.5% (3.8-15.2) in patients with uric acid in the three lower quartiles (log-rank test, P = 0.006). In a Cox proportional hazards model with sex and age as fixed covariates, uric acid was associated with subsequent development of persistent macroalbuminuria (hazard ratio 2.37 [95% CI 1.04-5.37] per 100 micromol/l increase in uric acid level; P = 0.04). Adjustment for confounders did not change the estimate significantly. CONCLUSIONS: Uric acid level soon after onset of type 1 diabetes is independently associated with risk for later development of diabetic nephropathy.