Evaluation of Skin to Stone Distance by Non-Contrast Computed Tomography as an Independent Predictor of Stone-Free Rate of Extra-Corporeal Shockwave Lithotripsy for Renal Pelvic Stones

Introduction: Pakistan is situated in the Afro-Asian stone belt. We come across a vast majority of patients having renal calculi. The treatment stones has evolved from open surgery to extracorporeal shock wave lithotripsy (ESWL), percutaneous nephrolithotomy (PCNL) and retrograde intrarenal (RIRS) past 20 years. Objective: To determine mean skin distance (SSD) undergoing ESWL for pelvic compare SSD between with successful failed outcomes stones. Subjects Methods: This descriptive case series study was carried out Department Urology, Institute Kidney Diseases Hayatabad Medical Complex Peshawar September 2017 March 2018. A total 50 were enrolled study. After consent, non-contrast computed tomography kidney ureter blabber (NCCT KUB) performed measured. All underwent ESWL. patient status either as free or residual based on NCCT KUB result noted 3rd month. Patients no fragments defined procedure successful. Results: age 39.02 +/- 12.16 33 (66%) male 17 (34%) female. 39 (78%) patients. 11 (22%) had outcome significantly lower than (10.9 3.0 vs 14.8 1.8 cm, p-value = 0.001) Practical Implication: results will help urologists deciding appropriate modality Conclusion: conclude that comparison those outcome. Therefore pre-treatment should be used which might predict Keywords: Renal calculi, Skin distance, shockwave lithotripsy.