Pyeloureteral Hydrodynamics – The Pelviureteral Junction Resistance in the Pig

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Abstract
The lowest pressure of urine transport was investigated in 12 pig pyeloureteral units. The investigation was performed in general anaesthesia with two catheters placed transparenchymically in renal pelvis – one for pressure registration and one for drainage. The baseline pressure in the pelves was established during a control period of 10 min. When the pressure in pelvis was lowered by means of drainage, ureteral activity and bolus transport was abolished. During a gradual increase of the resistance to drainage urine transport through ureter re-occurred. The pressure of recurrence was in all cases but one the same as the baseline pressure within a difference of 2 cm H2O. The minimal pressure of transport is an important parameter in characterizing pelviureteral dynamics and according to the present study this minimal pressure is reproducible in the single pig pyeloureter.

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