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- W1507368649 abstract "The effects of renal arterial pressure change on renal output of sodium and volume were measured during water diuresis in 25 chloralose-anesthetized dogs. Conditions included a minimal invasive stress, limited sodium administration, and mean renal arterial pressures varied suprarenally, by aortic balloon inflation to lowermost levels of 82-106 mm Hg. Group A dogs received no aldosterone; group B, C and D dogs were given aldosterone. Dogs of group C also received (1-Sar, 8-Ile)-angiotensin II. Group D dogs received phenylephrine which elevated arterial and right atrial pressures moderately without decrease in renal blood flow. In groups A, B and C, mean changes in sodium output, volume output, fractional excretions and free water clearances were not detectable with mean renal arterial pressure reductions, which averaged 29 +/- 2.9, 22 +/- 2.8 and 27 +/- 5.2 mm Hg, respectively. Right atrial pressures, effective renal blood flows and glomerular filtration rates did not change with the renal arterial pressure changes in these groups. In the group D dogs, during the larger pressure reductions of 54 +/- 6.6 mm Hg from higher values of 158 +/- 7.0 mm Hg, mean urine flow and effective renal blood flow remained constant while glomerular filtration rate and sodium output decreased only slightly. Output efficiency ratios related to perfusion pressure were calculated. With no more than modest pressure-induced excretory changes, it is concluded that excretory sodium and urinary volume autoregulation in concert with nearly perfect circulatory autoregulation were demonstrated with regionally varied mean renal arterial pressure. The same preglomerular myogenic responses to transvascular pressure, which restrict glomerular and transcapillary pressures, are viewed dominantly responsible for both circulatory and excretory autoregulation under normal conditions of minimal stress and low fractional sodium excretions. Homeostatic implications are discussed concerning likely relevance to the Guyton-Coleman theory for the long-term control of arterial blood pressure." @default.
- W1507368649 created "2016-06-24" @default.
- W1507368649 creator A5082612591 @default.
- W1507368649 date "1991-01-01" @default.
- W1507368649 modified "2023-09-27" @default.
- W1507368649 title "Modest Pressure Natriuresis and Autoregulation during Water Diuresis in Dogs" @default.
- W1507368649 doi "https://doi.org/10.1159/000158890" @default.
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- W1507368649 hasPublicationYear "1991" @default.
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