Efficacy of extracorporeal shock wave lithotripsy for solitary lower calyceal stone: a statistical model

• DOI: 10.1111/j.1464-410x.2003.04618.x
• Publication Date: 2004-02-04T16:43:56Z
• Authors: A. Srivastava; W. Zaman; V. Singh; A. Mandhani; A. Kumar; U. Singh
• Keywords: Extracorporeal

OBJECTIVE To evaluate the effect of inferior calyceal radiographic anatomy, number extracorporeal shock wave lithotripsy (ESWL) sessions and stone size on successful clearance solitary calculi after ESWL. PATIENTS AND METHODS In a prospective study between January 2001 November 2002, 66 renal units with calculus ≤ 2 cm were treated electrohydraulic The infundibulopelvic angle (two definitions), infundibulovertebral angle, infundibular diameter, length, cortical thickness over lower pole, minor calyces determined from intravenous urography before treatment. ESWL was also included in analysis. Treatments which produced residual fragments not clearing within 3 months satisfactory fragmentation considered as failures. All patients whom treatment failed successfully by percutaneous nephrolithotomy. data then analysed using two different statistical methods; first intravariable differences test proportion (Fisher's test) all variables together logistic regression. RESULTS At 78.8% clear stone. statistically significant except (<1 cm, 1–2 cm). multivariate analysis variables, only most important predictor for ( P = 0.03). CONCLUSIONS is initial choice selected stones. appears to be clearance.