Abstract
The kidney pelves of 4 mongrel dogs were infused with contrast media at known constant rates through nephrostomy tubes. Cine studies were carried out as boluses formed at the ureteral cone. From these studies, the average length, average area, and average of the boluses were determined for various flow rates. Each was multiplied by the observed peristaltic frequency to produce length, area, and volume factors. Urinary excretion was determined for each dog and added to the infusion rate to estimate total excretion. Statistical analysis of results revealed very good correlation with true excretion and only small differences in the usefulness of each factor to enable prediction of total excretion. Area and volume factors are slightly better than length factors. Since the area factor is more simply derived, it is the method of choice for the small boluses occurring in the dog's ureter. The accuracy of the method is such that it would appear best suited to serve as a screening method, recognizing as...
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