Effects of statin treatment on uric acid homeostasis in patients with primary hyperlipidemia.

BACKGROUND

Epidemiologic studies have shown that serum uric acid is a risk factor of coronary artery disease. In addition to fenofibrate, there is some evidence that atorvastatin may have a hypouricemic action, but the underlying mechanisms remain speculative.

METHODS

This randomized trial was conducted to investigate the effects of atorvastatin and simvastatin on uric acid homeostasis in patients treated for primary hyperlipidemia. A total of 180 patients were enrolled; patients were randomly assigned to 40 mg/d of either atorvastatin or simvastatin. Serum lipid and metabolic parameters were measured at baseline and at 6 and 12 weeks of treatment; random urine samples were simultaneously obtained for creatinine, sodium, and uric acid determinations.

RESULTS

Baseline serum uric acid levels correlated positively with the body mass index, serum insulin, creatinine, and triglyceride levels and inversely with serum HDL cholesterol levels. Both statins caused a favorable effect on lipids and a significant decrease in fibrinogen and high-sensitivity CRP levels. However, only atorvastatin reduced serum uric acid levels (from 5.6 +/- 1.7 to 4.9 +/- 1.5 mg/dL, P <.0001) by augmenting its urinary fractional excretion (from 10.4% +/- 7.9% to 12.0% +/- 7.4%, P <.01). In a multivariate logistic regression analysis, the reduction of uric acid levels was independently associated with baseline serum uric acid concentration but not to other variables, including lipid parameters (OR, 1.65; 95% CI, 1.14 to 2.40; P =.008).

CONCLUSIONS

Atorvastatin (but not simvastatin) significantly lowered serum uric acid levels. This result may be in favor of a preferable choice of atorvastatin for the treatment of hyperlipidemic patients presenting with hyperuricemia.