Uric Acid and the Risks of Kidney Failure and Death in Individuals With CKD

Overview

Journal Am J Kidney Dis

Specialty Nephrology

Date 2017 Nov 15

PMID 29132945

Citations 121

Authors

Anand Srivastava

Arnaud D Kaze

Ciaran J McMullan

Tamara Isakova

Sushrut S Waikar

Affiliations

Soon will be listed here.

Abstract

Background: Serum uric acid concentrations increase in chronic kidney disease (CKD) and may lead to tubular injury, endothelial dysfunction, oxidative stress, and intrarenal inflammation. Whether uric acid concentrations are associated with kidney failure and death in CKD is unknown.

Study Design: Prospective observational cohort study.

Settings & Participants: 3,885 individuals with CKD stages 2 to 4 enrolled in the Chronic Renal Insufficiency Cohort (CRIC) between June 2003 and September 2008 and followed up through March 2013.

Predictor: Baseline uric acid concentrations.

Outcomes: Kidney failure (initiation of dialysis therapy or transplantation) and all-cause mortality.

Results: During a median follow-up of 7.9 years, 885 participants progressed to kidney failure and 789 participants died. After adjustment for demographic, cardiovascular, and kidney-specific covariates, higher uric acid concentrations were independently associated with risk for kidney failure in participants with estimated glomerular filtration rates (eGFRs) ≥ 45mL/min/1.73m (adjusted HR per 1-standard deviation greater baseline uric acid, 1.40; 95% CI, 1.12-1.75), but not in those with eGFRs<30mL/min/1.73m. There was a nominally higher HR in participants with eGFRs of 30 to 44mL/min/1.73m (adjusted HR, 1.13; 95% CI, 0.99-1.29), but this did not reach statistical significance. The relationship between uric acid concentration and all-cause mortality was J-shaped (P=0.007).

Limitations: Potential residual confounding through unavailable confounders; lack of follow-up measurements to adjust for changes in uric acid concentrations over time.

Conclusions: Uric acid concentration is an independent risk factor for kidney failure in earlier stages of CKD and has a J-shaped relationship with all-cause mortality in CKD. Adequately powered randomized placebo-controlled trials in CKD are needed to test whether urate lowering may prove to be an effective approach to prevent complications and progression of CKD.

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