Journal
AMERICAN JOURNAL OF THE MEDICAL SCIENCES
Volume 354, Issue 4, Pages 379-387Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.amjms.2017.05.020
Keywords
Folic acid; Homocysteine; Stroke; Cardiovascular disease; Meta-analysis
Categories
Funding
- Beijing Outstanding Talent Training Project [2016000020124G066]
- Peking Union Medical College Graduate Student Innovation Fund [10023-1002-1001]
- CAMS Innovation Fund for Medical Sciences [2016-I2M-1-002]
- National Key Research and Development Program of China [2016YFC1300100]
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Background: Controversy remains regarding the efficacy of folic acid supplementation in reducing the risk of stroke. This study aimed to evaluate the effect of folic acid supplementation on stroke prevention in patients with cardiovascular disease (CVD). Materials and Methods: We searched the PubMed, EMBASE and Cochrane Library databases through October 2016 to identify randomized clinical trials of folic acid supplementation to prevent stroke in patients with CVD. Relative risks (RRs) with 95% Cls were used to examine the association between folic acid supplementation and the risk of stroke with a fixed-effect model. Stratified analyses were performed according to modifiers that may affect the efficacy of folic acid supplementation. Results: Eleven studies with a total of 65,790 participants were included. Folic acid supplementation was associated with a significant benefit in reducing the risk of stroke in patients with CVD (RR = 0.90; 95% CI: 0.84-0.97; P = 0.005). In the stratified analysis, greater beneficial effects were observed in participants with a decrease in homocysteine concentrations of 25% or greater (RR = 0.85; 95% CI: 0.74-0.97; P = 0.03), those with a daily folate dose of less than 2 mg (RR = 0.78; 95% CI: 0.68-0.89; P = 0.01), and populations in regions with no or partly fortified grain (RR = 0.87; 95% CI: 0.81-0.94; P 0.04). Conclusions: Our meta-analysis demonstrated that folic acid supplementation is effective in stroke prevention in patients with CVD.
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