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• W2077772456 startingPage "191" @default.
• W2077772456 abstract "We compared blood pressure, hindquarter vascular resistance properties, left ventricular weight, and norepinephrine kinetics, in spontaneously hypertensive rats (SHR) and weight-matched normotensive Wistar-Kyoto (WKY) rats at 4, 9, 14, 20, 30, and 50 weeks of age. At 4 weeks, systolic and mean blood pressure measurements were the same in both strains, but the vascular resistance of the fully dilated hindquarter bed was significantly higher in SHR than in WKY rats, with a much larger difference during maximum constriction. Plots of resistance at maximum dilatation and at maximum constriction against body weight suggest that a component of the increase in vascular muscle mass in SHR occurred in the neonatal period preceding hypertension followed by a later component related to the rise in blood pressure. By contrast, left ventricular hypertrophy was minimal at 4 weeks and most of its development paralleled the rise in blood pressure. Sympathetic activity, assessed by norepinephrine fractional rate constant, was higher in SHR than in WKY rats in the left ventricle and kidney through most of the period between 4 and 50 weeks, but was similar in both strains in the muscle bed. This pattern of sympathetic activity will accentuate hypertension once cardiac and vascular hypertrophy are fully established. In all regions, norepinephrine tissue concentration was higher in young SHR and could potentiate the trophic effects of growth factors in early vascular hypertrophy. We suggest that the initial (primary) component of vascular hypertrophy precedes the rise in blood pressure and may be critical in the pathogenesis of hypertension. Possible reasons for the short delay in the rise in blood pressure in young SHR, once the vascular amplifier has been established, include high vascularity, immaturity of smooth muscle, and delay in the development of left ventricular hypertrophy." @default.
• W2077772456 created "2016-06-24" @default.
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• W2077772456 date "1989-08-01" @default.
• W2077772456 modified "2023-10-16" @default.
• W2077772456 title "Differential development of vascular and cardiac hypertrophy in genetic hypertension. Relation to sympathetic function." @default.
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• W2077772456 doi "https://doi.org/10.1161/01.hyp.14.2.191" @default.
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