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• W1981585835 abstract "Objectives The effect of oxidative stress on coronary microvascular disease is unknown. We investigated whether chronic administration of ascorbic acid (ASC) or glutathione (GSH) prevents microvascular dysfunction and remodeling induced by upstream repeated coronary artery endothelial injury. Methods Balloon endothelial injury was repeated at the left anterior descending coronary artery (LAD), just distal to an implanted flow meter, every 2 weeks for 6 weeks in pigs. Changes in LAD blood flow induced by acetylcholine (ACh) and 5-hydroxytryptamine were assessed before each endothelial injury and at 8 weeks after the first endothelial injury in pigs without treatment (endothelial injury group, n=12) and in pigs treated with oral ASC (3 g/day) (ASC group, n=12) and ASC (3 g/day) plus GSH (1 g/day) (ASC+GSH group, n=12). Results In the endothelial injury group, reduced blood flow in response to ACh was augmented from a decrease of 18±17% to a decrease of 100% (that is, zero flow, 8 weeks, P<0.01), accompanied by an increase of ascorbyl free radicals (AFRs) in coronary sinus blood. In contrast, in the ASC+GSH group, blood flow response to ACh was altered to a decrease of 45±17% (8 weeks, P<0.01 compared with the endothelial injury group), coronary sinus blood AFRs did not change (8 weeks, 21.4±12.5 signal intensities, P<0.01 compared with the endothelial injury group) and the rate of platelet aggregation induced by adenosine diphosphate was small (8 weeks, 56±17%, P<0.01 compared with the endothelial injury group). Conclusions Chronic administration of antioxidants suppressed microvascular hypercontraction, suggesting that it may be a promising therapeutic strategy for treating coronary microvessel disorders, including microvascular angina." @default.
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• W1981585835 date "2004-02-01" @default.
• W1981585835 modified "2023-10-13" @default.
• W1981585835 title "Effects of antioxidants on coronary microvascular spasm induced by epicardial coronary artery endothelial injury in pigs" @default.
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• W1981585835 doi "https://doi.org/10.1097/00019501-200402000-00004" @default.
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