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Antioxidants for chronic kidney disease.
Min Jun1, Vinod Venkataraman, Mona Razavian
1Renal and Metabolic Division, The George Institute for Global Health, Camperdown, Australia.
The Cochrane Database of Systematic Reviews
|October 19, 2012
Summary
Antioxidant therapy shows no clear overall benefit for cardiovascular or all-cause mortality in chronic kidney disease (CKD) patients. However, it may reduce cardiovascular events in dialysis patients and slow progression to end-stage kidney disease (ESKD).
Area of Science:
- Nephrology and Cardiovascular Medicine
- Oxidative Stress and Antioxidant Research
- Clinical Trial Analysis
Background:
- Chronic kidney disease (CKD) significantly increases the risk of premature cardiovascular disease and mortality.
- Oxidative stress is a key factor implicated in cardiovascular complications associated with CKD.
- Antioxidant therapy is being investigated as a potential intervention to mitigate cardiovascular risks in CKD patients.
Purpose of the Study:
- To evaluate the efficacy and safety of antioxidant therapy in patients with CKD stages 3-5, on dialysis, and kidney transplant recipients.
- To assess the impact of antioxidant therapy on mortality and major cardiovascular events in CKD populations.
Main Methods:
- Systematic review and meta-analysis of randomized controlled trials (RCTs) identified through comprehensive database searches (Cochrane Renal Group, CENTRAL, MEDLINE, EMBASE).
- Inclusion criteria focused on RCTs investigating antioxidant use in CKD patients, with outcomes for CKD subsets also considered.
- Data extraction and pooling were performed using random effects models, with results expressed as risk ratios (RR) or mean differences (MD) with 95% confidence intervals (CI).
Main Results:
- Antioxidant therapy demonstrated no significant overall reduction in cardiovascular mortality (RR 0.95), all-cause mortality (RR 0.93), or major cardiovascular events.
- A significant benefit was observed for cardiovascular disease prevention in dialysis patients (RR 0.57), but not in non-dialysis CKD patients.
- Antioxidant therapy showed a trend towards reducing end-stage kidney disease (ESKD) progression (RR 0.50), lowering serum creatinine, and improving creatinine clearance.
Conclusions:
- While overall mortality benefits are not clear, antioxidant therapy may offer advantages for cardiovascular health in dialysis patients.
- Preliminary evidence suggests a potential role in slowing CKD progression to ESKD, though based on limited events and requiring further validation.
- The current evidence base, characterized by small study sizes and variable quality, necessitates larger, well-powered trials to definitively establish the role of antioxidant therapy in CKD management.
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