Analysis of Urinary Calculi in Voided Urine after ESWL

Jung, Suk Young; Park, Yong Hun

Abstract

Accurate analysis of urinary calculi is fundamental for study of the etiology of stone formation and essential for treatment of urinary stone and its prevention. A total of 600 patients underwent treatments with ESWL for urinary tract calculi between May, 1987 and June, 1989. The stone fragments that were passed with 99 patient's urine and 21 stone calculi required surgical removal, were analyzed by infrared spectrometer. The following results were obtained : 1. Mixed calculus (58.3%) in much more than single calculus (41.7% ), The most common type of calculi is calcium oxalate-calcium phosphate (69 cases-57.5% ). The most common type of components is calcium oxalate (105 cases-87.5%). 2. Uric acid stones are found in acid urine, and most of magnesium ammonium phosphate stones are found in alkaline urine. 3. 17 of 120 cases have bacteriuria on culture and most of them are ureasplitting organisms. 4. 21 calculi of failed ESWL were analyzed and the components were calcium oxalate-calcium phosphate in 14, calcium oxalate in 4, magnesium ammonium phosphate in 2, uric acid in 1. 5. The causes of failed ESWL were stone components in 5 cases, impacted stone in 10 cases and poor stone localization in 6 cases.