Analysis of Urinary Stone Components during the Last Two Decades

Abstract

oxalate made up 73.1% of the total. Other components found in the stones were uric acid 12.3%, calcium phosphate 8.3%, magnesium ammonium 5.3%, ammonium acid urate 0.7% and cystine 0.3%. In Group B, calcium oxalate was only 56.3% of the total and uric acid was 22.2%, calcium phosphate was 11.4%, magnesium ammonium phosphate was 8.2%, ammonium acid urate was 1.3% and cystine was 0.6%. On comparison of the stones of the two groups, the incidence of calcium oxalate was decreased in Group A (73.1% vs 56.3%, p＜0.001). However, the incidence of uric acid in Group B was increased (12.3% vs 22.2%, respectively, p=0.006). There were no notable statistical increases in the frequency of the other components (p＞0.05). Conclusions: In this study, the incidence of calcium oxalate was decreased and that of the uric acid was increased in the recent decade. These changes of stone components probably resulted from the increased animal protein