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• W4210367258 abstract "Background Changes in arterial wall viscosity, which dissipates the energy stored within the arterial wall, may contribute to the beneficial effect of heart rate (HR) reduction on arterial stiffness and cardiovascular coupling. However, it has never been assessed in humans and could be altered by aging. We evaluated the effect of a selective HR-lowering agent on carotid arterial wall viscosity and the impact of aging on this effect. Methods and Results This randomized, placebo-controlled, double-blind, crossover study performed in 19 healthy volunteers evaluated the effects of ivabradine (5 mg BID, 1-week) on carotid arterial wall viscosity, mechanics, hemodynamics, and cardiovascular coupling. Arterial wall viscosity was evaluated by the area of the hysteresis loop of the pressure-lumen cross-sectional area relationship, representing the energy dissipated (WV), and by the relative viscosity (WV/WE), with WE representing the elastic energy stored. HR reduction by ivabradine increased WV and WE whereas WV/WE remained stable. In middle-aged subjects (n=11), baseline arterial stiffness and cardiovascular coupling were less favorable, and WE was similar but WV and therefore WV/WE were lower than in youth (n=8). HR reduction increased WV/WE in middle-aged but not in young subjects, owing to a larger increase in WV than WE. These results were supported by the age-related linear increase in WV/WE after HR reduction (P=0.009), explained by a linear increase in WV. Conclusion HR reduction increases arterial wall energy dissipation proportionally to the increase in WE, suggesting an adaptive process to bradycardia. This mechanism is altered during aging resulting in a larger than expected energy dissipation, the impact of which should be assessed. Registration URL: https://www.clinicaltrials.gov; Unique identifier: 2015/077/HP. URL: https://www. eudract.ema.europa.eu; Unique identifier: 2015-002060-17." @default.
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• W4210367258 date "2022-02-15" @default.
• W4210367258 modified "2023-10-14" @default.
• W4210367258 title "Adaptation of Arterial Wall Viscosity to the Short‐Term Reduction of Heart Rate: Impact of Aging" @default.
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• W4210367258 doi "https://doi.org/10.1161/jaha.121.023409" @default.
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