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- W1935889229 abstract "It is now well accepted that many forms of experimental hypertension and human essential hypertension are caused by increased activity of the sympathetic nervous system. However, the role of region-specific changes in sympathetic nerve activity (SNA) in the pathogenesis of hypertension has been difficult to determine because methods for chronic measurement of SNA in conscious animals have not been available. We have recently combined indirect, and continuous and chronic direct, assessment of region-specific SNA to characterize hypertension produced by administration of angiotensin II (Ang II) to rats consuming a high-salt diet (Ang II–salt hypertension). Angiotensin II increases whole-body noradrenaline (NA) spillover and depressor responses to ganglionic blockade in rats consuming a high-salt diet, but not in rats on a normal-salt diet. Despite this evidence for increased ‘whole-body SNA’ in Ang II–salt hypertensive rats, renal SNA is decreased in this model and renal denervation does not attenuate the steady-state level of arterial pressure. In addition, neither lumbar SNA, which largely targets skeletal muscle, nor hindlimb NA spillover is changed from control levels in Ang II–salt hypertensive rats. However, surgical denervation of the splanchnic vascular bed attenuates/abolishes the increase in arterial pressure and total peripheral resistance, as well as the decrease in vascular capacitance, observed in Ang II–salt hypertensive rats. We hypothesize that the ‘sympathetic signature’ of Ang II–salt hypertension is characterized by increased splanchnic SNA, no change in skeletal muscle SNA and decreased renal SNA, and this sympathetic signature creates unique haemodynamic changes capable of producing sustained hypertension." @default.
- W1935889229 created "2016-06-24" @default.
- W1935889229 creator A5053076079 @default.
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- W1935889229 date "2009-10-22" @default.
- W1935889229 modified "2023-10-18" @default.
- W1935889229 title "Region-specific changes in sympathetic nerve activity in angiotensin II-salt hypertension in the rat" @default.
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- W1935889229 doi "https://doi.org/10.1113/expphysiol.2008.046326" @default.
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