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• W2024359945 abstract "Background and Purpose— Although plasma total homocysteine (tHcy) levels are associated with cardiovascular disease, it remains unclear whether homocysteine is a cause or a marker of atherosclerotic vascular disease. We determined whether reduction of tHcy levels with B vitamin supplementation reduces subclinical atherosclerosis progression. Methods— In this double-blind clinical trial, 506 participants 40 to 89 years of age with an initial tHcy >8.5 μmol/L without diabetes and cardiovascular disease were randomized to high-dose B vitamin supplementation (5 mg folic acid+0.4 mg vitamin B 12 +50 mg vitamin B 6 ) or matching placebo for 3.1 years. Subclinical atherosclerosis progression across 3 vascular beds was assessed using high-resolution B-mode ultrasonography to measure carotid artery intima media thickness (primary outcome) and multidetector spiral CT to measure aortic and coronary artery calcium (secondary outcome). Results— Although the overall carotid artery intima media thickness progression rate was lower with B vitamin supplementation than with placebo, statistically significant between-group differences were not found ( P =0.31). However, among subjects with baseline tHcy ≥9.1 μmol/L, those randomized to B vitamin supplementation had a statistically significant lower average rate of carotid artery intima media thickness progression compared with placebo ( P =0.02); among subjects with a baseline tHcy <9.1 μmol/L, there was no significant treatment effect (probability value for treatment interaction=0.02). B vitamin supplementation had no effect on progression of aortic or coronary artery calcification overall or within subgroups. Conclusion— High-dose B vitamin supplementation significantly reduces progression of early-stage subclinical atherosclerosis (carotid artery intima media thickness) in well-nourished healthy B vitamin “replete” individuals at low risk for cardiovascular disease with a fasting tHcy ≥9.1 μmol/L." @default.
• W2024359945 created "2016-06-24" @default.
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• W2024359945 date "2009-03-01" @default.
• W2024359945 modified "2023-09-23" @default.
• W2024359945 title "High-Dose B Vitamin Supplementation and Progression of Subclinical Atherosclerosis" @default.
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• W2024359945 doi "https://doi.org/10.1161/strokeaha.108.526798" @default.
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