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Vol. 36, No. 5, 1999
Issue release date: November 1999 (September 1999)

Factors Influencing the Course of Calcium Oxalate Stone Disease

Tiselius H.-G.
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Abstract

Objective: To assess the influence of previous stone formation, urine and stone composition on the further course of the disease in recurrent calcium stone formers without pharmacological treatment. Method: The course of the disease was analysed during a prospective follow-up period by means of Kaplan-Meier estimates. At the start of follow-up the patients were subgrouped with regard to their previous history of stone formation expressed as stone age index (SAI = 100 × number of stones/age), urine composition, stone composition, and sex. In 223 of the patients was it possible to calculate AP(CaOx) indexs, a standardized estimate of the ion-activity product of calcium oxalate. Results: The 446 patients (329 men, 117 women) who were considered representative of an average population of recurrent calcium stone formers, had a 5-year recurrence risk of approximately 50%. Patients with an SAI <2 had a lower recurrence risk than those with an SAI >2 and a corresponding difference was recorded between patients with SAI levels <5 and >5. Furthermore, female patients had a lower risk of new stone formation than male patients. Patients with an AP(CaOx) indexs of 1.5 or more had a significantly higher recurrence risk than those with a lower index, a difference that was most pronounced in female stone formers. A slightly higher risk of recurrent stone formation during the follow-up period could also be related to the presence of calcium phosphate in the stone, a high AP(CaP) indexs (a standardized estimate of the ion-activity product of calcium phosphate) and a low concentration of citrate. Conclusion: AP(CaOx) indexs and SAI were the most obvious predictors of the recurrence risk and these two variables, together with information on the sex distribution, might be useful for deriving an expected recurrence risk at a defined point of time in a group of recurrent stone formers. Such an estimate can be valuable for conclusions on the efficacy of different stone-preventive treatments when an appropriate control group is lacking.



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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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