A novel technique of ureteroneocystostomy (extravesical seromuscular tunnel): an experimental study in dogs. I. Preliminary results.
OBJECTIVE
To present the preliminary results of a novel technique of ureteroneocystostomy with a new principle (extravesical seromuscular tunnel).


METHODS
The new technique was applied in the left ureter of 12 mongrel dogs. The dogs were stratified into three groups (4 dogs each) according to the length of the extravesical seromuscular tunnel. Tunnel lengths of 3, 2, and 1 cm were used for groups I, II, and III, respectively. All the dogs were evaluated by excretory urography, radioisotope renography, and ascending cystography before and at 2 weeks and 3 months after ureteroneocystostomy. Urodynamic evaluation by the Whitaker test and ureteral pressure profile were carried out at 3 months.


RESULTS
None of the 12 dogs showed vesicoureteral reflux. All but 1 dog of group I and 2 dogs of group II showed evidence of ureteric obstruction. All 4 dogs of group III showed perfect configuration and function of the corresponding renal units at 2 weeks and 3 months after ureteroneocystostomy. Moreover, the intrapelvic pressure and the superimposed ureteral pressure of this group were approximately similar to pressures of the normal contralateral side.


CONCLUSIONS
Preliminary results of this new technique of ureteroneocystostomy revealed that an extravesical seromuscular tunnel of 1 cm provides reflux prevention without obstruction.
Urology and Nephrology Center, Mansoura, Egypt.
S
S
el-Hammady
A A
AA
Shokeir
D000818:Animals; D003559:Cystostomy / Q000379:methods*; D004285:Dogs; D011859:Radiography; D014513:Ureter / Q000000981:diagnostic imaging; D014519:Ureterostomy / Q000379:methods*; D001743:Urinary Bladder / Q000000981:diagnostic imaging