Ureteroscopy and lasertripsy with pop dusting using high power holmium laser for large urinary stones > 15mm: 6.5-year prospective outcomes from a high-volume stone center.

Abstract

Ureteroscopy and stone lasertripsy (URSL) is a recognized technique for treatment of urinary tract stones. Holmium:Yag laser has been successfully used for this purpose for the last two decades. More lately, pulse modulation with Moses technology and high power lasers have been introduced with the result of faster and more efficient stone lasertripsy. Pop dusting is a two-stage combined treatment using a long pulse Ho:YAG laser, initially in contact mode with the stone 'dusting' (0.2-0.5J/40-50Hz) followed by non-contact mode 'pop-dusting' (0.5-0.7J/20-50Hz). We wanted to look at the outcomes of lasertripsy for renal and ureteric stones using a high-power laser machine. Over a period of 6.5years (January 2016-May 2022), we prospectively collected data for patients undergoing URSL for stones larger than 15mm treated using high power Ho:YAG laser (60W Moses or 100W laser). Patient parameters, stone demographics and outcomes of URSL were analyzed. A total of 201 patients, underwent URSL for large urinary stones. In 136 patients (61.6%) stones were multiple and the mean single and cumulative stone size was 18mm and 22.4mm respectively. A pre- and post-operative stent was placed in 92 (41.4%) and 169 (76%) respectively. The initial and final stone free rate (SFR) were 84.5% and 94% respectively and 10% patients underwent additional procedure to achieve stone free status. 7 (3.9%) complications were recorded, all related to UTI/sepsis, with 6 Clavien II and 1 Clavien IVa complication. Dusting and pop-dusting has shown to be successful and safe with the ability to treat large, bilateral or multiple stones with low retreatment and complication rates.