A constant electrical activity of the renal pelvis correlated to ureteral peristalsis.

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Abstract
Using a bipolar macroelectrode, simultaneous recordings of both pelvic and ureteral electromyograms were carried out in dogs. The recordings were performed at 3 stages of urine flow; oliguric, increasing and diuretic stages. The interval of the pelvic discharge was constant while its speed of propagation was slower than that of the ureter (1.32 cm/s and 2.12 cm/s, respectively). At oliguric stage the interperistaltic interval in the ureter constituted a multiple of the pelvic discharge interval. Ureteral peristaltic rate reached that of the renal pelvis with increasing urine flow. These results are discussed in relation to a hypothesis of a renal pelvic pacemaker.

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