Objective: We used an experimental study to evaluate the effects of ureteral manipulation on the disintegration of impacted ureteral calculi. Methods:Fifteen urinary calculi were divided into 3 groups according to the type of ureteral manipulation. Group 1: control group, no manipulation; group 2:bypass catheterization, and group 3: below irrigation in porcine ureter. Each calculus was subjected to 500 shock wave pulses with 0.28 mJ/mm^2 power density by a Siemens Lithostar II lithotriptor. Results: The successful disintegration ratio for calculus sizes less than 4 and 2 mm was 79.4 ± 13.1 and 42.2± 7.5% (group 1), 82.3 ± 5.2 and 43.5 ± 2.4% (group 2) and 84.3 ± 17.3 and 49.7 ± 14.6% (group 3). There was no statistical difference among the 3 groups by Anova and the Kruskal-Wallis test. Conclusion: The ureteral manipulation of impacted ureteral calculi was unable to improve stone disintegration by shock wave.

Keywords:
Extracorporeal shock wave lithotripsy, Urinary calculi, Ureter
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1997
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