Abstract
The experiments embodied in this abstract deal quantitatively with the renal blood flow, under different experimental conditions. They were performed upon dogs with the stromuhr described by Burton-Opitz. 1 The right and the left renal veins were used.
Besides the quantitative data, the authors succeeded in obtaining vaso-motor effects on stimulation of the præ, as well as post ganglionic fibers, the constrictory effects being in both cases the most prominent. The constriction of the blood vessels of the kidney was betrayed by a decrease in the venous return from this organ and a fall in venous blood pressure, this change being preceded by a brief increase of flow.
Among the post ganglionic fibers (renal plexus) a nerve was isolated which gave decided vaso-constrictory results.
In another series of experiments the pressure in the ureter was increased while the blood-flow in the corresponding renal vein was being recorded. The pressure was increased by means of air led into the ureter in the immediate vicinity of the kidney and of the bladder. Every increase in pressure from 20-120 mm. Hg resulted in a decrease in the venous return from the kidney and a fall in venous pressure, the decrease being in harmony with the height of the ureter pressure. A pressure of 20 mm. Hg or less remained ineffective when introduced next to the bladder, but produced a weak retardation of the venous flow when led into the upper portion of the ureter.
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