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Ureteral activity during the intravesical infusion was examined by urometry and electro-ureterograpby in 12 normal persons and a patient with vesico-ureteral reflux. The urometrograms and electro-ureterograms in normal persons indicated that when the bladder was distended with physiologic saline solution, the ureteral peristalsis responded so as to overcome the increased intravosical pressure. In the case with vesico-ureteral reflux, the ureteral peristalsis was found to be preserved. The values measured on the urometrogram and electro-ureterogram were all within the range of normal ones, and the urine was transported smoothly from the renal pelvis to the bladder without the reflux, when the intravesical pressure was below 10cm H2O. When the intravesical pressure was raised up to 10cm H2O, the reflux appeared. Even in this ureter persitalsis responded so as to flow out the refluxed urine. These findings suggest that ureteral perisitalis, if it remains, works to repress the veiico-ureteral reflux as far as it can resist the increased intravesical pressure and that it works against the reflux, when it actually occurs.

Ureteral Activity during Increased Intravesical Pressure