Abstract
Background
In autosomal dominant polycystic kidney disease (ADPKD) it is frequently found a reduction in urinary citrate of unknown origin. It has been suggested that it could be a marker of acid retention in chronic kidney disease. Our aim was to compare urinary citrate in ADPKD with other nephropathies and to show its relation with serum bicarbonate.
Methods
We determined urinary citrate in patients with several nephropathies and varied renal function. We included 291 patients, 119 with glomerular diseases, 116 with ADPKD, 21 with other nephropathies, and 35 patients with normal renal function.
Results
Urinary citrate was higher in women and in patients with normal renal function. ADPKD patients showed similar values of urinary citrate to patients with glomerular diseases and with other nephropathies. We observed a progressive reduction in urinary citrate with renal impairment, in a comparable way among patients with ADPKD and glomerular diseases. We did not observe a relationship with serum bicarbonate. Serum uric acid levels were significantly higher in patients with glomerular diseases than in ADPKD patients, even after correction with the degree of renal function.
Conclusions
Hypocitraturia is not specific of ADPKD but it is also present in all tested nephropathies and is related with renal impairment and not with serum bicarbonate. It could be interesting to study urinary citrate as a marker of renal function and as a prognostic factor.
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Research idea and study design: FJBU; data acquisition: FJBU, IHC, EMG, CMD, MJGC; data analysis/interpretation: FJBU, IHC, EOP; statistical analysis: FJBU. Each author contributed important intellectual content during manuscript drafting or revision. All authors aproved the final version of the manuscript.
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Authors have no conflict of interest to declare. We have not received any financial support for this research. We declare that the results presented in this paper have not been published previously in whole or part, except in abstract format.
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Borrego Utiel, F., Herrera Contreras, I., Merino García, E. et al. Hypocitraturia is present when renal function is impaired in diverse nephropathies and is not related with serum bicarbonate levels. Int Urol Nephrol 54, 1261–1269 (2022). https://doi.org/10.1007/s11255-021-02992-7
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DOI: https://doi.org/10.1007/s11255-021-02992-7