[Excretory behavior in transureteral ureterostomy with unilateral definitive nephrostomy (TUUS II)].

For the sake of clarity it is proposed to label the methods of transureteral ureterostomy as TUUS I and TUUS II. The "volume-impulse method" is used to obtain information on the flow situation from the non-fistulated kidney in TUUS II. It must be considered that all results were obtained under the most favourable conditions of the supine splint. Moreover the flow situation varies according to individual conditions. Following an initial increase in pressure in the non-fistulated system with infinitely great flow resistance of the ureter, an "opening pressure" ist achieved, at which the flow resistance has reached a finite level and drainage from the renal pelvis begins. Above this pressure the flow resistance is regulated so that the increase in pressure caused by normal diuresis is almost negligible. A flow equilibrium is attained in the non-fistulated kidney at pressures which, although unphysiologically high, allow the kidney to function.