Therapeutic efficacy of Dornier MPL 9000 for prevesical calculi as judged by efficiency quotient.

Purpose: To study the efficacy and safety of the Dornier MPL 9000 lithotripter in the treatment of prevesical calculi using real-time ultrasound monitoring and to see if efficacy is adequately judged by the efficiency quotient (EQ). Patients and Methods: Seventy-six patients underwent ultrasound-guided extracorporeal shockwave lithotripsy (SWL) for prevesical calculi over a period of 43 months. Their age ranged from 8 to 68 (mean 37.6) years, and the male:female ratio was 2.6:1. The size of the stones, measured in two dimensions, ranged from 4 to 25 mm (mean 9.3 mm) and 2 to 15 mm (mean 6.0 mm). No general or regional anesthesia or ureteral stents were used, and all patients were treated in the prone position. The EQ was calculated using the formula: Stone free (%) × 100/(100 + retreatment rate (%) + auxiliary procedures (%). Results: Seventy patients were stone free in a mean time of 15 ± 14.11 days. The average number of shockwaves used was 2831 ± 1612, and the average number of sessions per patient was...