Angiographic analysis of renal vasoconstriction

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Abstract
The effects of renal nerve stimulation, catecholamine infusion, and renal vein constriction on intrarenal vessel calibers were studied in dogs with a technique which combined renal perfusion at constant flow with selective angiography of the kidney. Equivalent elevations of total renal vascular resistance by nerve stimulation and catecholamine infusion resulted in different intrarenal hemodynamic changes. Nerve stimulation elicited constriction of both the large and small arterial segments, whereas the catecholamines constricted only the smaller segments while the renal and interlobar segments were passively dilated. Either no change or a decrease in the size of the interlobar and arcuate arteries was noted during renal vein constriction. It was concluded that intrarenal hemodynamics are affected differentially by the neurogenic and humoral components of the sympathetic nervous system.

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