Effect of Urate-Lowering Therapy on the Progression of Kidney Function in Patients With Asymptomatic Hyperuricemia: A

Lin Zhang1, Kang An1, Xingyu Mou1

  • 1Department of General Practice, West China Hospital, Sichuan University, Chengdu, China.

Frontiers in Pharmacology
|February 4, 2022
PubMed

Insights

Urate-lowering therapy (ULT) does not slow kidney function decline in patients with asymptomatic hyperuricemia. While ULT lowers uric acid and gout risk, it did not prevent kidney events or mortality in this systematic review.

Area of Science:

  • Nephrology
  • Rheumatology
  • Clinical Pharmacology

Background:

  • Hyperuricemia is a known risk factor for chronic kidney disease (CKD).
  • The efficacy of urate-lowering therapy (ULT) in preventing kidney function decline in asymptomatic hyperuricemia remains controversial.
  • This study addresses the impact of ULT on kidney function progression in patients without symptomatic gout.

Purpose of the Study:

  • To systematically review and meta-analyze randomized controlled trials evaluating the effect of ULT on kidney function progression in asymptomatic hyperuricemia.
  • To assess whether ULT influences estimated glomerular filtration rate (eGFR) slopes, kidney events, and mortality.
  • To evaluate ULT's impact on serum uric acid levels and gout incidence.

Main Methods:

  • A systematic search of MEDLINE, EMBASE, and Cochrane databases was conducted for randomized controlled trials up to November 30, 2020.
  • Studies compared ULT with controlled therapies in patients with asymptomatic hyperuricemia.
  • Eleven studies were included for qualitative synthesis and meta-analysis.

Main Results:

  • ULT did not significantly improve eGFR slopes (WMD 0.36 ml/min/1.73 m² per year; 95% CI: -0.31, 1.04).
  • No significant reduction was observed in kidney events (RR 1.26; 95% CI: 0.80, 2.00) or all-cause mortality (RR 1.00; 95% CI: 0.65, 1.55).
  • ULT effectively lowered serum uric acid levels (WMD -2.73 mg/dl; 95% CI: -3.18, -2.28) and reduced gout incidence (RR 0.38; 95% CI: 0.17, 0.86).

Conclusions:

  • Urate-lowering therapy does not appear to slow kidney function progression in patients with asymptomatic hyperuricemia.
  • While effective for lowering uric acid and preventing gout, ULT's benefit on kidney function requires further investigation.
  • Larger, long-term studies are necessary to definitively ascertain the role of ULT in managing kidney health in this population.

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