Outcome of Rirs for Renal Pelvic Stones 1.5 to 2.0 cm using Semi-Rigid Uretero-Renoscopy

Background Retrograde Intrarenal Surgery (RIRS) is among the recommended treatment modality for stones located in renal pelvis and is of less than 2 cm. Renal Stones with Hounsfield units more than 1000 have low stone free rate with ESWL. Objective To determine the outcome of retrograde intrarenal surgery using semirigid ureteroscope in fragmentation of renal pelvic stone. Methods Patients with 1.5-2.0 cm stone located in renal pelvis of more than 1000 HU who underwent retrograde intrarenal surgery as primary procedure at Sindh Institute of Urology And Transplantation were included. Stone fragmentation was achieved with holmium-yttrium aluminum garnet laser. Secondary procedure was performed if complete stone fragmentation was not achieved. Statistical analysis was performed by SPSS version 20. Result Total 82 patients with mean size of pelvic renal stones 1.7 ± 0.53 cm were included. The mean operating time was 32.1±12.9 mins. The stone clearance rate at six weeks after the first procedure was 79.3%. Minor complications including flank pain, fever and hematuria were reported. Conclusion Retrograde intrarenal surgery performed with semi rigid ureteroscope in renal pelvic stones of more than 1000 HU is a technically safe and effective procedure. Keywords: Retrograde intrarenal surgery; Pelvic stone; Flexible ureteroscopy and holmium laser.