Impact of serum uric acid on renal function and cardiovascular events in hypertensive patients treated with losartan
Hypertension Research,  Clinical Article

Ito S et al. – Hyperuricemia may be a major determinant of increased cardiovascular risk in chronic kidney disease (CKD) stage 3A, and serum uric acid level (SUA) may be involved in the progression of CKD. Changes in the glomerular filtration rate (GFR) influence the rate of cardiovascular event (CVE).

Methods
  • This subanalysis of the Japan Hypertension Evaluation with Angiotensin II Antagonist Losartan Therapy (J–HEALTH) study included 7629 patients, in whom the serum creatinine level was measured at least twice.
  • The study examined the impact of hyperuricemia (SUA ≥7mgdl–1) on CVE according to the level of renal dysfunction and whether early changes in SUA predicted future glomerular filtration rates (GFRs).
  • The mean follow–up period was 3.1 years.
  • The patients were divided into three groups according to the baseline estimated GFR (eGFR): groups A, B and C with eGFR <45, 45–59 and ≥60mlmin–1 per 1.73m2, respectively. eGFR increased from 38.1 to 57.6, from 52.8 to 67.5 and from 74.7 to 80.7mlmin–1 per 1.73m2 in groups A, B and C, respectively.

Results
  • In non–hyperuricemic patients, the CVE rate was 10.83, 4.98 and 4.21/1000 person–years in groups A, B and C, respectively, while in hyperuricemic patients, the corresponding values were 14.18, 17.02 and 5.93.
  • Thus, hyperuricemia increased the risk of CVE only in group B (relative risk (RR) 3.43 (95% confidence interval (CI) 1.55 to 7.60); P<0.002).
  • The final change in the eGFR was negatively correlated with the change in SUA from baseline to year 1 (P<0.001).
  • CVEs were more frequent in those with a decrease in eGFR.

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