Prognostic estimation of chemical composition of recurrent urinary stones.

We conducted a retrospective study of the course of recurrent urolithiasis in 127 patients (63 women, 64 men aged from 27 to 58) who were under close and regular outpatient follow-up for up to 15 years and who did not receive conservative prophylactic therapy due to different reasons. The group consisted of 33 patients with uric acid lithiasis, 52 patients with calcium oxalate lithiasis, 42 patients with magnesium-ammonium-phosphate lithiasis. By the start of follow-up not a single patient had had urinary stones detected by ultrasound and X-ray.