[Long-term results of endourological treatment of urinary calculi: multivariate analyses of the risk factors related to recurrence or re-growth].
To evaluate the risk factors related to the long-term outcome of endourologic treatment of urinary calculi, data from the rates of recurrence or re-growth in 145 patients with 167 renal units who were observed for more than 3 months at the Hiroshima University Hospital, were reviewed. The factors included in the present analysis were age, previous stone, location, number, size and composition of stone and procedures of treatment. Of 167 renal units, the overall recurrence and re-growth rates were 17% and 10%, respectively. The earliest recurrence and re-growth appeared at 3 months after the treatment, and 71% of recurrence and 81% of re-growth occurred within 2 years. In 9 out of 20 renal units (45%) with unsuccessful treatment, residual stones enlarged during the follow-up. Stone located in renal calyx and pelvis, previous stone, multiple stones, size of stone more than 20 mm, stone composed of calcium oxalate and/or calcium phosphate and struvite stone were likely to be risk factors. However, on the univariate analysis there were no significance of difference among these variables. On the results of analysis by Cox's proportional hazards model, characteristics such as stone located in renal calyx and pelvis, size of stone more than 20 mm (p < 0.01), treatment with percutaneous nephrolithotripsy (PNL), previous stone, size of stone between 10 mm and 20 mm, and multiple stones (p < 0.05), were significantly related to either recurrence or re-growth of stone.(ABSTRACT TRUNCATED AT 250 WORDS)
Yamasaki
A
A
Department of Urology, Hiroshima University School of Medicine.
D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016016:Proportional Hazards Models; D012008:Recurrence; D012307:Risk Factors; D018666:Ureteroscopy; D014545:Urinary Calculi / Q000209:etiology / Q000473:pathology / Q000628:therapy*