The effect of varying renal artery pressure between 160 and 40 mm Hg on renal blood flow and renin release was studied in seven conscious foxhounds under β-adrenergic blockade receiving a normal sodium diet (4.1 mmol/kg/day). Pressure was either increased by bilateral common carotid occlusion or reduced in steps and maintained constant by a control-system using an inflatable renal artery cuff. Carotid occlusion itself had no influence on renal blood flow and renin release when renal artery pressure was kept constant and the β-receptors in the kidney were blocked.
Between 160 mm Hg and resting pressure there was no change in renal blood flow; between resting blood pressure and the lower limit of autoregulation (average 63.9 mm Hg) renal blood flow increased slightly (average 7%) indicating a high efficiency of renal blood flow autoregulation.
The relationship between renal artery pressure and renin release could be approximated by two linear sections:a low sensitivity to a pressure change (average slope: −0.69 ±0.26ng AI/min/mm Hg) was found above a threshold pressure (average: 89.8±3.3 mm Hg) and a high sensitivity to a pressure change (average slope: −64.4±20.8 ng AI/ min/mm Hg) was observed between threshold pressure and 60 mm Hg. There was no further increase of renin release between 60 and 40 mm Hg.
It is concluded that within the autoregulatory plateau the kidney of a conscious β-blocked dog receiving a normal sodium diet releases only negligible amounts of renin until renal artery pressure falls below a threshold pressure of 90 mm Hg which is close to the animals resting systemic pressure. Since beyond that a decrease of systemic pressure by as little as 1.3 mm Hg below threshold can raise resting renin release (84.8±29.8 ng/min) by 100%, it is suggested that systemic blood pressure tends to stabilize at a level at which renin release is minimal.
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This study was supported by the German Research Foundation within the SFB 90, Heidelberg
A preliminary report of a part of this investigation has been presented to the meeting of the German Society of Nephrology, Würzburg, October 1980 (Kidney Int. 20, 152, 1981)
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Finke, R., Gross, R., Hackenthal, E. et al. Threshold pressure for the pressure-dependent renin release in the autoregulating kidney of conscious dogs. Pflugers Arch. 399, 102–110 (1983). https://doi.org/10.1007/BF00663904
- Blood pressure
- Kidney blood flow
- Renin release