[Examination of the risk factors for infectious urolithiasis formation in patients receiving urinary diversion or urinary reconstruction using intestine--comparison of reservoir and ileal conduit].

Urinary risk factors and preventive factors for infectious calcium (Ca) urolithiasis formation, such as citrate, oxalate, Ca, phosphate, magnesium, and uric acid were examined more than 2 months after performing a urinary reservoir in 12 patients (R group) and ileal conduit in 10 patients (C group). There was no difference in the positive rate of risk factors between the two groups and also no difference in the positive rate of more than two risk factors between the two groups. Although four patients with more than two risk factors in the R group suffered from reservoir stones all of which included Ca-urolithiasis, none in the C group did. In the R group, the incidence of stone formation in patients with 2 or more risk factors was significantly higher than those in patients with 1 or no risk factor. In conclusion, the urinary reservoir operation should not be carried out in patients with more than two risk factors for urolithiasis formation, and urinary risk factors should be examined before reservoir operation.