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Statins for Improving Renal Outcomes: A Meta-Analysis

Sabrina Sandhu^*, Natasha Wiebe^*, Linda F. Fried and Marcello Tonelli^*,,,||

^* Medicine; Critical Care; Public Health Sciences, University of Alberta; ^|| Institute of Health Economics, Edmonton, Alberta, Canada; and Veterans Affairs Pittsburgh Healthcare System and Renal-Electrolyte Division, University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania

Address correspondence to: Dr. Marcello Tonelli, University of Alberta, Division of Nephrology & Immunology, 7-129 Clinical Science Building, 8440 112 Street, Edmonton, Alberta T6B 2B7, Canada. Phone: 780-407-8716; Fax: 780-407-7878; mtonelli{at}ualberta.ca

Received for publication January 6, 2006. Accepted for publication April 20, 2006.

Statins frequently are used to prevent cardiovascular events. Several recent studies suggest that statins also may have renal benefits, although this is controversial. This systematic review and meta-analysis were performed to assess the effect of statins on change in kidney function and urinary protein excretion. Medline, EMBASE, the Cochrane Central Register of Controlled Trials, conference proceedings, and the authors’ personal files were searched. Published or unpublished randomized, controlled trials or crossover trials of statins that reported assessment of kidney function or proteinuria were included, and studies of individuals with ESRD were excluded. Data were extracted for study design, subject characteristics, type of statin and dose, baseline/change in cholesterol levels, and outcomes (change in measured or estimated GFR [eGFR] and/or urinary protein excretion). Weighted mean differences were calculated for the change in GFR between statin and control groups using a random-effects model. A random-effects model also was used to calculate the standardized mean difference for the change in urinary protein excretion between groups. Twenty-seven eligible studies with 39,704 participants (21 with data for eGFR and 20 for proteinuria or albuminuria) were identified. Overall, the change in the weighted mean differences for eGFR was statistically significant (1.22 ml/min per yr slower in statin recipients; 95% confidence interval [CI] 0.44 to 2.00). In subgroup analysis, the benefit of statin therapy was statistically significant in studies of participants with cardiovascular disease (0.93 ml/min per yr slower than control subjects; 95% CI 0.10 to 1.76) but was NS for studies of participants with diabetic or hypertensive kidney disease or glomerulonephritis. The standardized mean difference for the reduction in albuminuria or proteinuria as a result of statin therapy was statistically significant (0.58 units of SD greater in statin recipients; 95% CI 0.17 to 0.98). Statin therapy seems to reduce proteinuria modestly and results in a small reduction in the rate of kidney function loss, especially in populations with cardiovascular disease.

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