Abstract
Background
The association of metabolic syndrome (MetS) traits with urinary calcium (UCE) or oxalate excretion (UOE) is uncertain in calcium stone formers (CSFs). Our aim was to investigate this association in a large group of Caucasian CSFs.
Methods
We retrospectively reviewed data of CSFs evaluated at our Kidney Stone Clinic from 1984 to 2015. Data on body mass index (BMI), MetS traits defined according to international consensus, family history of urolithiasis, anti-hypertensive treatments, calcemia, renal function, and 24-h urinary profile of lithogenic risk were collected. The association between MetS traits and UCE or UOE was tested with multivariate linear regression models accounting for a long list of potential confounders.
Results
We included 3003 CSFs, aged 44 ± 14 years. The prevalence of hypertension, diabetes, overweight (BMI ≥ 25 kg/m2) and dyslipidemia was 17, 2, 42 and 38%, respectively. Median values of UCE and UOE were 211 mg/24 h (IQR 143–296) and 28 mg/24 h (IQR 22–34), respectively. At a multivariate model, including age, sex, date of examination, drug treatments, family history, renal function, blood calcium and urinary factors as covariates, hypertension was a significant positive determinant of UCE (β ± SE 0.23 ± 0.07, p = 0.003), but overweight, dyslipidemia and diabetes were not. No MetS trait was significantly associated with UOE in multivariate models.
Conclusions
In a large group of Caucasian CSFs, hypertension was the only MetS trait significantly associated with UCE, while no MetS trait was associated with oxalate excretion.
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Acknowledgements
The authors wish to thank Dr. Nicoletta Cerundolo for precious assistance in data management and collection.
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Research idea and study design: AT, LB, TM; data analysis/interpretation: AT, AG, FA, AN; statistical analysis: MM, FL; supervision: LB, TM; revision of the manuscript for important intellectual content: GC, MM, FL.
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All the authors have read and understood the Journal of Nephrology’s policy on disclosing conflict of interest. All the authors have no conflict of interest to declare, with the exception of Tiziana Meschi, who received an unconditioned grant for research in the field of nephrolithiasis by Acqua&Terme Fiuggi S.p.A. (Fiuggi, Frosinone, Italy).
Ethical approval
The study protocol was approved by the local Ethics Committee (ID 16280). All investigations were carried out in conformity with the Declaration of Helsinki principles.
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Written informed consent was obtained from participants, according to current legislation for retrospective studies.
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Ticinesi, A., Guerra, A., Allegri, F. et al. Determinants of calcium and oxalate excretion in subjects with calcium nephrolithiasis: the role of metabolic syndrome traits. J Nephrol 31, 395–403 (2018). https://doi.org/10.1007/s40620-017-0453-3
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DOI: https://doi.org/10.1007/s40620-017-0453-3