RESUMO
We had treated the 331 patients with lower ureter stone with EDAP-LT01 lithotriptor, Surveying 231 patients of them. whose retrospective study (or prospective) was possible, we have analyzed the factors that influenced on the treatment effect. So we got the following results. Most of stone size was ranged from 0.61 to 0.90 cm (38.6%). Stone clearance was achieved in 220 cases at 15 month and treatment failure was 11 cases (4.7%). Of the 220 patients, location of stone was more than 3.1 cm above ischial spine(IS) on KUB in 5 cases. Between 1.1-3.0 cm above it in 35 cases, +/-1. 0 cm of IS were 170 cases, and more than 1.1-3.0 cm below of it in 10 cases. There was no difference in the amount of total storage of shockwave in stone clearance according to location of stones, but high storage of shock wave required on cases of 3.1 cm above IS group. The 220 patients were grouped by in situ lower ureter stone at the time of the first visit to the hospital (158 cases), migration from upper stone (55 cases) and steinstrasse from upper tract stone (7 cases). The amount of shock wave consumption was 216.4, 301.2, 407.7 respectively, so initially lower ureter stone were treated with more effectiveness. Of the 220 cases, there were 184 cases of mild ureteral dilation, 34 cases of moderate ureteral dilation and 2 cases of severe ureteral dilation. The amount of shock wave consumption was 224, 295, 795 respectively. So treatment of these cases also showed significant difference (p=0.021). From these results, we concluded that effectiveness of ESWL against lower ureteral stone was related to the degree of ureteral dilatation, location of stone and situation of the stone migration within the ureter.