1985 Volume 76 Issue 6 Pages 859-864
The present investigation was undertaken in order to clarify urine transporting ability in the pelviureteral system in the absence of peristalsis.
Twenty-nine preparations of renal pelvis and ureter from 16 dogs were used. When 5-10% formalin solution was infused into the pelviureteral lumen, peristaltic activity ceased for about 5 minutes. Measurements of intrapelvic pressure, ureteral electromyogram and urine volume were made simultaneously before and after formalin infusion and during the period when peristaltic activity was absent. Aperistalsis was defined as the condition in which the peristaltic frequency was less than twice per minutes.
Results:
1) Although formalin solution was infused into the pelvi-ureteral system, in 8 out of the 29 renal pelvis and ureter specimens used, peristaltic activity did not cease.
2) In 21 pelvi-ureteral systems, peristaltic activity ceased within 1 min 27sec after infusion of formalin solution and the aperistaltic condition continued for an average of 5min 6sec.
3) There was no significant difference between the frequency of contraction before infusion of the formalin solution, during the time from the start of infusion to the cessation of peristalsis and after the recommencement of peristalsis.
4) There was no significant difference in intrapelvic pressure among before infusion of formalin solution, during the absence of peristalsis and after the recommencement of peristalsis.
5) Urine volume during the absence of peristalsis was significantly higher than that under other conditions.
Since intrapelvic pressure and urine volume in the absence of ureteral peristalsis showed no significant differences in comparison with those before and after infusion of formalin solution, it is suggested that the aperistaltic ureter is able to transport urine without marked elevation of intrapelvi-ureteral pressure if there are no morphological changes in the pelvi-ureteral system.
