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[Treatment of bladder lithiasis with shock-wave extracorporeal lithotripsy].

PURPOSE
To evaluate the effectiveness and the prognostic factors of the bladder stones (BS) treatment by means of extracorporeal shock wave lythotripsy (ESWL).


METHODS
183 patients with BS treated using ESWL were retrospectively analysed. Independent variables were: gender, age, obstruction, BS size, BS number and amount of waves. Dependent variable was total BS resolution. Statistical analysis was provided by Cox's regression multivariate analysis, Kaplan-Meier analysis and the t Student test.


RESULTS
Total effectiveness of the treatment was 73%. Initial BS size was the only prognostic factor on multivariate analysis (p = 0.0035) with smaller stones obtaining the best results (log rank p = 0.00001): 92% of effectiveness in BS smaller than 1 cm2, 73% in 1-2 cm2, 57% in 2-3 cm2 and 42% in larger than 3 cm2. BS mean size decreased 2 cm2 after the first ESWL (p = 0.00001).


CONCLUSIONS
Initial BS size was the only prognostic factor of resolution. Total effectiveness was 73% and it highly increased in BS smaller than 2 cm2.