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- W2885541332 abstract "Background— Recent studies in vitro have demonstrated that endothelium-derived hydrogen peroxide (H2O2) is an endothelium-derived hyperpolarizing factor (EDHF) in animals and humans. The aim of this study was to evaluate our hypothesis that endothelium-derived H2O2 is an EDHF in vivo and plays an important role in coronary autoregulation. Methods and Results— To test this hypothesis, we evaluated vasodilator responses of canine (n=41) subepicardial small coronary arteries (≥100 μm) and arterioles (<100 μm) with an intravital microscope in response to acetylcholine and to a stepwise reduction in coronary perfusion pressure (from 100 to 30 mm Hg) before and after inhibition of NO synthesis with NG-monomethyl-l-arginine (L-NMMA). After L-NMMA, the coronary vasodilator responses were attenuated primarily in small arteries, whereas combined infusion of L-NMMA plus catalase (an enzyme that selectively dismutates H2O2 into water and oxygen) or tetraethylammonium (TEA, an inhibitor of large-conductance KCa channe..." @default.
- W2885541332 created "2018-08-22" @default.
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- W2885541332 date "2003-02-25" @default.
- W2885541332 modified "2023-09-23" @default.
- W2885541332 title "Hydrogen Peroxide, an Endogenous Endothelium-Derived Hyperpolarizing Factor, Plays an Important Role in Coronary Autoregulation In Vivo" @default.
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