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- W2182158001 abstract "To determine whether the chronically denervated kidney is supersensitive to either physiological or pathophysiological plasma levels of norepinephrine (NE), studies were conducted in conscious dogs subjected to unilateral renal denervation and surgical division of the urinary bladder into hemibladders to allow separate 24-h urine collection from denervated and innervated kidneys. Plasma NE concentration was increased by chronic infusion of NE (4-5 days) at rates of 25, 100, and 200 ng . kg-1 . min-1. Twenty-four-hour control values for mean arterial pressure (MAP), plasma NE concentration, and ratios for urinary sodium and potassium excretion from denervated and innervated kidneys (Den/Inn) were 94 +/- 4 mmHg, 145 +/- 24 pg/ml, 1.05 +/- 0.05, and 0.97 +/- 0.07, respectively. With infusions of NE producing plasma levels of NE of up to approximately 3,000 pg/ml or plasma concentrations of NE at least threefold greater than present under most pathophysiological conditions and during acute activation of the sympathetic nervous system, there were no significant long-term changes in MAP or relative excretion rates of sodium and potassium from denervated and innervated kidneys. In marked contrast, pharmacological plasma levels of NE ( approximately 7,000 pg/ml) produced chronic increases in MAP (to 116 +/- 2% of control) and sustained reductions in Den/Inn for urinary sodium and potassium excretion to 57 +/- 4 and 68 +/- 5% of control, respectively, indicating a lower excretion rate of these electrolytes from denervated vs. innervated kidneys. We conclude that the chronically denervated kidney does not exhibit an exaggerated antinatriuretic response to either physiological or pathophysiological levels of circulating NE. It is therefore unlikely that renal denervation supersensitivity is a confounding issue in studies employing chronic renal denervation to elucidate the role of the renal nerves in the regulation of sodium excretion." @default.
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- W2182158001 date "1998-10-01" @default.
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- W2182158001 title "Renal denervation supersensitivity revisited" @default.
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- W2182158001 doi "https://doi.org/10.1152/ajpregu.1998.275.4.r1239" @default.
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