DOES CHOOSING BETWEEN DUSTING OR FRAGMENTATION DURING LASER LITHOTRIPSY OF URINARY STONES CHANGE THE LONG TERM RESULTS

INTRODUCTION Variations in laser pulse energy and it's frequency during lithotripsy, affect the rate and the method of stone breaking. The main modes of lithotripsy are dusting and fragmentation. AIMS Comparison between long term results of dusting versus fragmentation, by defining the stone free rate (SFR) for each method and the time period until re-treatment need. METHODS Clinical and radiological follow-up of 43 patients who underwent laser intervention using dusting or fragmentation. Both groups shared similar demographic features, stone sizes and locations. For each group, the percentage of patients without stones requiring intervention during the follow-up period of 36 months was defined as a success parameter. The incidence of emergency department (ED) admissions and auxiliary interventions were assessed. RESULTS Thirty-eight patients were included in the study. No difference in the median period of time to clinically significant stone was seen (p=0.213). No difference was found in SFR between the dusting (83.3%) and the fragmentation (84.6%) groups respectively (p=1.000). No statistically significant difference was shown in ED admissions due to renal colic occurring in 31.6% and 10.5% within dusting and fragmentation groups respectively (p=0.116). CONCLUSIONS No difference in time period until clinically significant stone appearance was seen. No significant difference in SFR was found between the groups at the long term follow-up. DISCUSSION It seems that within the dusting group, the ED admission rate could be somewhat higher. However, this impression lacks statistical significance. A long term prospective study with a larger population is needed to confirm these results.